US5327355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage or reactive power control method and control device therefor
Assignee: Hitachi Ltd
•
Filing: 1992-01-17
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Granted: 1994-07-05
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Expires: 2012-01-17
Abstract
Abstract In order to control a voltage using e.g. a tap transformer, the difference ΔV between the actual voltage and a reference voltage is obtained and integrated over time. That integral is then modified by at least one parameter generated by fuzzy logic from control conditions of the voltage. In this way the fuzzy logic may find the optimum control strategy which keeps the actual voltage closest to the reference voltage without an excessive number of tap position changes. The reference voltage may vary with time, and therefore the control of the voltage with time may be evaluated, and the control conditions varied accordingly, e.g. by fuzzy logic, so that the control arrangement can exhibit learning. Normally, the integral is modified such that ∫ΔVdt≧B when B is the parameter determined by the fuzzy logic, but other control strategies may be used. The present invention is also applicable to control of reactive power.
Inventors
- 👤 Tomio Chiba
- 👤 Mitsuyasu Kido
- 👤 Junzo Kawakami
- 👤 Kunio Hirasawa
- 👤 Yoshiaki Matsui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:20
CPC Classifications
H; H02; H02J; H02J3/00; H02J3/12; G; G05; G05B; G05B13/00; G05B13/02; G05B13/0265; G05B13/0275; H02J3/18; H02J3/1878; H02P; H02P13/00; H02P13/06; Y; Y02; Y02E; Y02E40/00; Y02E40/30; Y10; Y10S; Y10S706/00; Y10S706/90
Claims Analysis
Total Claims: 66
Claim 1
Independent Claim
118 words
A method of controlling a voltage, said method comprising: detecting the voltage difference between said voltage and a reference voltage; establishing a plurality of control conditions; determining a new voltage difference such that: ∫.sup.A CΔVdT≧B, where: t is time, V is said new voltage difference, and A, B and C are parameters, and wherein at least one of said parameters A, B and C is varied based on an analysis of said control conditions, said analysis being performed by fuzzy logic which converts the control conditions into qualitative items, utilizing a membership function, and combines the qualitative items, utilizing an inferential rule, to induce a quantitative item; and controlling said voltage on the basis of said quantitative item.
Claim 2
Independent Claim
118 words
A method of controlling a voltage, said method comprising: detecting the voltage difference between said voltage and a reference voltage; establishing a plurality of control conditions; determining a new voltage difference such that: ∫.sup.A CΔVdT≧B, where: t is time, V is said new voltage difference, and A, B and C are parameters, and wherein at least one of said parameters A, B and C is varied based on an analysis of said control conditions, said analysis being performed by fuzzy logic which converts the control conditions into qualitative items, utilizing a membership function, and combines the qualitative items, utilizing an inferential rule, to induce a quantitative item; and controlling said voltage on the basis of said quantitative item.
Claim 3
Dependent Claim
14 words
A method according to claim 1 further comprising varying said reference voltage with time.
Claim 4
Dependent Claim
14 words
A method according to claim 1, wherein said control conditions include the absolute time.
Claim 5
Dependent Claim
20 words
A method according to claim 1, wherein said control conditions include the trend of variation of said voltage with time.
Claim 6
Dependent Claim
18 words
A method according to claim 1, wherein said control conditions include the value of ΔV at any time.
Claim 7
Dependent Claim
24 words
A method according to claim 1, wherein said control conditions include ∫ X ΔVdt, and ∫ Y ΔVdt where X is different from Y.
Claim 8
Dependent Claim
28 words
A method according to claim 1, further comprising evaluating the control of the voltage with time, and varying said control conditions based on said evaluating of said control.
Claim 9
Independent Claim
89 words
A method of controlling a voltage, using a tap transformer which varies voltage by change in the tap position, said method comprising: detecting the voltage difference between said voltage and a reference voltage; and controlling said tap transformer by fuzzy logic on the basis of control conditions, including said voltage difference and a predetermined desired number of tap position changes, wherein the fuzzy logic converts the control conditions into qualitative items, utilizing a membership function, and combines the qualitative items, utilizing an inferential rule, to induce a quantitative item.
Claim 10
Independent Claim
89 words
A method of controlling a voltage, using a tap transformer which varies voltage by change in the tap position, said method comprising: detecting the voltage difference between said voltage and a reference voltage; and controlling said tap transformer by fuzzy logic on the basis of control conditions, including said voltage difference and a predetermined desired number of tap position changes, wherein the fuzzy logic converts the control conditions into qualitative items, utilizing a membership function, and combines the qualitative items, utilizing an inferential rule, to induce a quantitative item.
Claim 11
Dependent Claim
28 words
A method according to claim 8, further comprising evaluating the control of the voltage with time, and varying said control conditions based on said evaluating of said control.
Claim 12
Independent Claim
92 words
A method of controlling a voltage, using a tap transformer which varies voltage by change in tap position, said method comprising: detecting the voltage difference between said voltage and a reference voltage; and controlling said tap transformer by fuzzy logic on the basis of control conditions including the integral over time of said voltage difference and a predetermined desired number of tap position changes, said fuzzy logic converting the control conditions into qualitative items, utilizing a membership function, and combining the qualitative, items utilizing an inferential rule, to induce a quantitative item.
Claim 13
Independent Claim
92 words
A method of controlling a voltage, using a tap transformer which varies voltage by change in tap position, said method comprising: detecting the voltage difference between said voltage and a reference voltage; and controlling said tap transformer by fuzzy logic on the basis of control conditions including the integral over time of said voltage difference and a predetermined desired number of tap position changes, said fuzzy logic converting the control conditions into qualitative items, utilizing a membership function, and combining the qualitative, items utilizing an inferential rule, to induce a quantitative item.
Claim 14
Independent Claim
98 words
A method of controlling a voltage, said method comprising: detecting the voltage difference between said voltage and a reference voltage; generating a control signal having a predetermined relationship to said voltage difference; establishing a plurality of control conditions; analyzing said control conditions using fuzzy logic which converts the control conditions into qualitative items, utilizing a membership function, and combines the qualitative items, utilizing an inferential rule, to induce a quantitative item; generating a control coefficient based on said analyzing of said control condition; and controlling said voltage on the basis of said control coefficient and said control signal.
Claim 15
Independent Claim
98 words
A method of controlling a voltage, said method comprising: detecting the voltage difference between said voltage and a reference voltage; generating a control signal having a predetermined relationship to said voltage difference; establishing a plurality of control conditions; analyzing said control conditions using fuzzy logic which converts the control conditions into qualitative items, utilizing a membership function, and combines the qualitative items, utilizing an inferential rule, to induce a quantitative item; generating a control coefficient based on said analyzing of said control condition; and controlling said voltage on the basis of said control coefficient and said control signal.
Claim 16
Dependent Claim
29 words
A method according to claim 11 wherein said control signal is such that: ∫ΔVdt≧D, where: t is time, ΔV is said voltage difference, and D is a constant parameter
Claim 17
Independent Claim
129 words
A method of controlling a voltage control system to regulate a voltage of the voltage control system, said method comprising: detecting the voltage difference between said voltage and a reference voltage; establishing a plurality of control conditions; determining a new voltage difference such that: ∫.sup.A CΔVdt≧V, where: t is time, ΔV is said new voltage difference, and A, B and C are parameters, and wherein at least one of said parameters A, B and C is varied based on an analysis of said control conditions, said analysis being performed by fuzzy logic which converts the control conditions into qualitative items, utilizing a membership function, and combines the qualitative items, utilizing an inferential rule, to induce a quantitative item; and controlling said voltage on the basis of said control signal.
Claim 18
Independent Claim
129 words
A method of controlling a voltage control system to regulate a voltage of the voltage control system, said method comprising: detecting the voltage difference between said voltage and a reference voltage; establishing a plurality of control conditions; determining a new voltage difference such that: ∫.sup.A CΔVdt≧V, where: t is time, ΔV is said new voltage difference, and A, B and C are parameters, and wherein at least one of said parameters A, B and C is varied based on an analysis of said control conditions, said analysis being performed by fuzzy logic which converts the control conditions into qualitative items, utilizing a membership function, and combines the qualitative items, utilizing an inferential rule, to induce a quantitative item; and controlling said voltage on the basis of said control signal.
Claim 19
Independent Claim
109 words
A method of controlling a voltage control system to regulate a voltage of the voltage control system, said method comprising: detecting the voltage difference between said voltage and a reference voltage; generating a control signal having a predetermined relationship to said voltage difference; establishing a plurality of control conditions; analyzing said control conditions using fuzzy logic which converts the control conditions into qualitative items, utilizing a membership function, and combines the qualitative item, utilizing an inferential rule, to induce a quantitative item; generating a control coefficient based on said analyzing of said control conditions; and controlling said voltage on the basis of said control coefficient and said control signal.
Claim 20
Independent Claim
109 words
A method of controlling a voltage control system to regulate a voltage of the voltage control system, said method comprising: detecting the voltage difference between said voltage and a reference voltage; generating a control signal having a predetermined relationship to said voltage difference; establishing a plurality of control conditions; analyzing said control conditions using fuzzy logic which converts the control conditions into qualitative items, utilizing a membership function, and combines the qualitative item, utilizing an inferential rule, to induce a quantitative item; generating a control coefficient based on said analyzing of said control conditions; and controlling said voltage on the basis of said control coefficient and said control signal.
Claim 21
Dependent Claim
116 words
A voltage control device comprising: means for detecting a voltage to be controlled; means for storing a reference voltage; means for determining the voltage difference between said detected voltage and said reference voltage; fuzzy logic means for: i) establishing a plurality of control conditions, ii) analyzing said control conditions, and iii) generating an output for controlling said voltage such that: ∫.sup.A CΔVdt≧B, where: t is time, ΔV is said voltage difference, and A, B and C are parameters, said fuzzy logic means being arranged to vary at least one of said parameters A, B and C based on said analyzing of said control conditions logic; and means for controlling said voltage in accordance with said output.
Claim 22
Dependent Claim
116 words
A voltage control device comprising: means for detecting a voltage to be controlled; means for storing a reference voltage; means for determining the voltage difference between said detected voltage and said reference voltage; fuzzy logic means for: i) establishing a plurality of control conditions, ii) analyzing said control conditions, and iii) generating an output for controlling said voltage such that: ∫.sup.A CΔVdt≧B, where: t is time, ΔV is said voltage difference, and A, B and C are parameters, said fuzzy logic means being arranged to vary at least one of said parameters A, B and C based on said analyzing of said control conditions logic; and means for controlling said voltage in accordance with said output.
Claim 23
Dependent Claim
35 words
A voltage control device according to claim 15, further comprising: means for monitoring the variation of said output with time; and means for varying said control conditions in dependence on said variation of said output.
Claim 24
Dependent Claim
93 words
A voltage control device comprising: means for detecting a voltage to be controlled; means for storing a reference voltage; means for determining the difference between said detected voltage and said reference voltage; fuzzy logic means for establishing a plurality of control conditions, converting the control conditions into qualitative items, utilizing a membership function, combining the qualitative items, utilizing an inferential rule, to induce a quantitative item, and generating a control coefficient based on the quantitative item; and means for controlling said voltage on the basis of said control signal and said control coefficient.
Claim 25
Dependent Claim
93 words
A voltage control device comprising: means for detecting a voltage to be controlled; means for storing a reference voltage; means for determining the difference between said detected voltage and said reference voltage; fuzzy logic means for establishing a plurality of control conditions, converting the control conditions into qualitative items, utilizing a membership function, combining the qualitative items, utilizing an inferential rule, to induce a quantitative item, and generating a control coefficient based on the quantitative item; and means for controlling said voltage on the basis of said control signal and said control coefficient.
Claim 26
Dependent Claim
121 words
A voltage control system comprising: means for detecting a voltge to be controlled; means for storing a reference voltage; means for determining the voltage difference between said detected voltage and said reference votage; fuzzy logic means for: i) establishing a plurality of control conditions, ii) establishing a plurality of control condition, iii) generating an output for controlling said voltage such that: ∫.sup.A CΔVdt≧B, where: t is time, ΔV is said voltage difference, and A, B and C are parameters, said fuzzy logic means being arranged to vary at least one of said parameters A, B and C in dependence on said analyzing of said control conditions; and a voltage regulating device for regulating said voltage on the basis of said output.
Claim 27
Dependent Claim
121 words
A voltage control system comprising: means for detecting a voltge to be controlled; means for storing a reference voltage; means for determining the voltage difference between said detected voltage and said reference votage; fuzzy logic means for: i) establishing a plurality of control conditions, ii) establishing a plurality of control condition, iii) generating an output for controlling said voltage such that: ∫.sup.A CΔVdt≧B, where: t is time, ΔV is said voltage difference, and A, B and C are parameters, said fuzzy logic means being arranged to vary at least one of said parameters A, B and C in dependence on said analyzing of said control conditions; and a voltage regulating device for regulating said voltage on the basis of said output.
Claim 28
Dependent Claim
17 words
A voltage control system according to claim 18, wherein said voltage regulating device is a tap transformer.
Claim 29
Dependent Claim
36 words
A voltage control system according to claim 18, further comprising: means for monitoring the variation of said voltage with time; and means for varying said control conditions on the basis of said variation of said voltage.
Claim 30
Dependent Claim
110 words
A voltage control system comprising: means for detecting a voltage to be controlled; means for storing a reference voltage; means for determining the difference between said detected voltage and said reference voltage; means for generating a control signal having a predetermined relationship to said voltage difference; fuzzy logic means for establishing a plurality of control conditions, converting the control conditions into qualitative items, utilizing a membership function, combining the qualitative items, utilizing an inferential rule, to induce a quantitative item, and generating a control coefficient based on the quantitative items; and a voltage regulating device for controlling said voltage on the basis of said control signal and said control coefficient.
Claim 31
Dependent Claim
110 words
A voltage control system comprising: means for detecting a voltage to be controlled; means for storing a reference voltage; means for determining the difference between said detected voltage and said reference voltage; means for generating a control signal having a predetermined relationship to said voltage difference; fuzzy logic means for establishing a plurality of control conditions, converting the control conditions into qualitative items, utilizing a membership function, combining the qualitative items, utilizing an inferential rule, to induce a quantitative item, and generating a control coefficient based on the quantitative items; and a voltage regulating device for controlling said voltage on the basis of said control signal and said control coefficient.
Claim 32
Dependent Claim
106 words
A voltage control system comprising: a tap transformer having at least one tap for controlling a voltage by change in the position of said tap; means for detecting said voltage; means for storing a reference voltage; means for determining the voltage difference between said detected voltage and said reference voltage; fuzzy logic means for controlling said transformer on the basis of control conditions, including said voltage difference and a predetermined desired number of changes in said tap position, said fuzzy logic converting the control conditions into qualitative items, utilizing a membership function, and combining the qualitative items, utilizing an inferential rule, to induce a quantitative item.
Claim 33
Dependent Claim
106 words
A voltage control system comprising: a tap transformer having at least one tap for controlling a voltage by change in the position of said tap; means for detecting said voltage; means for storing a reference voltage; means for determining the voltage difference between said detected voltage and said reference voltage; fuzzy logic means for controlling said transformer on the basis of control conditions, including said voltage difference and a predetermined desired number of changes in said tap position, said fuzzy logic converting the control conditions into qualitative items, utilizing a membership function, and combining the qualitative items, utilizing an inferential rule, to induce a quantitative item.
Claim 34
Dependent Claim
58 words
A voltage control system comprising: a tap transformer having at least one tap for controlling a voltage by change in the position of said tap; and a voltage control device for controlling said tap transformer on the basis of the integral over time of said voltage difference and a predetermined desired number of changes in said tap position.
Claim 35
Dependent Claim
58 words
A voltage control system comprising: a tap transformer having at least one tap for controlling a voltage by change in the position of said tap; and a voltage control device for controlling said tap transformer on the basis of the integral over time of said voltage difference and a predetermined desired number of changes in said tap position.
Claim 36
Independent Claim
122 words
A method of controlling reactive power, comprising: detecting the reactive power difference between said reactive power and a reference reactive power; reestablishing a plurality of control conditions; and determining a new reactive power difference such that: ∫.sup.A CΔQdt≧B, where: t is time, ΔQ is said reactive power difference, and A, B and C are parameters, and wherein at least one of said parameters A, B and C is varied based on an analysis of said control conditions, said analysis being performed by fuzzy logic which converts the control conditions into qualitative items, utilizing a membership function, and combines the qualitative items utilizing an inferential rule, to induce a quantitative item; and controlling said reactive power on the basis of said quantitative item.
Claim 37
Independent Claim
122 words
A method of controlling reactive power, comprising: detecting the reactive power difference between said reactive power and a reference reactive power; reestablishing a plurality of control conditions; and determining a new reactive power difference such that: ∫.sup.A CΔQdt≧B, where: t is time, ΔQ is said reactive power difference, and A, B and C are parameters, and wherein at least one of said parameters A, B and C is varied based on an analysis of said control conditions, said analysis being performed by fuzzy logic which converts the control conditions into qualitative items, utilizing a membership function, and combines the qualitative items utilizing an inferential rule, to induce a quantitative item; and controlling said reactive power on the basis of said quantitative item.
Claim 38
Independent Claim
101 words
A method of controlling reactive power, comprising: detecting the reactive power difference between said reactive power and a reference reactive power; generating a control signal having a predetermined relationship to said reactive power difference; establishing a plurality of control conditions; analyzing said control conditions using fuzzy logic which converts the control conditions into qualitative items, utilizing a membership function, and combines the qualitative items utilizing an inferential rule, to induce a quantitative item; generating a control coefficient based on said analyzing of said control conditions; and controlling said reactive power on the basis of said control coefficient and said control signal.
Claim 39
Independent Claim
101 words
A method of controlling reactive power, comprising: detecting the reactive power difference between said reactive power and a reference reactive power; generating a control signal having a predetermined relationship to said reactive power difference; establishing a plurality of control conditions; analyzing said control conditions using fuzzy logic which converts the control conditions into qualitative items, utilizing a membership function, and combines the qualitative items utilizing an inferential rule, to induce a quantitative item; generating a control coefficient based on said analyzing of said control conditions; and controlling said reactive power on the basis of said control coefficient and said control signal.
Claim 40
Independent Claim
140 words
A method of controlling a reactive power control system to regulate a reactive power of the reactive power control system, said method system comprising: detecting the reactive power difference between said reactive power and a reference reactive power; establishing a plurality of control conditions; determining a new reactive power difference such that: ∫.sup.A CΔQdt≧B, where: t is time, ΔQ is said new reactive power difference, and A, B and C are parameters, and wherein at least one of said parameters A, B and C is varied based on an analysis of said control conditions, said analysis being performed by fuzzy logic which converts the control conditions into qualitative items, utilizing a membership function, and combines the qualitative items, utilizing an inferential rule, to induce a quantitative items; and controlling said reactive power in accordance with the new reactive power difference.
Claim 41
Independent Claim
140 words
A method of controlling a reactive power control system to regulate a reactive power of the reactive power control system, said method system comprising: detecting the reactive power difference between said reactive power and a reference reactive power; establishing a plurality of control conditions; determining a new reactive power difference such that: ∫.sup.A CΔQdt≧B, where: t is time, ΔQ is said new reactive power difference, and A, B and C are parameters, and wherein at least one of said parameters A, B and C is varied based on an analysis of said control conditions, said analysis being performed by fuzzy logic which converts the control conditions into qualitative items, utilizing a membership function, and combines the qualitative items, utilizing an inferential rule, to induce a quantitative items; and controlling said reactive power in accordance with the new reactive power difference.
Claim 42
Independent Claim
117 words
A method of controlling a reactive power control system to regulate a reactive power of the reactive power control system, said method comprising: detecting the reactive power difference between said reactive power and a reference reactive power; generating a control signal having a predetermined relationship to said reactive power difference; establishing a plurality of control conditions; analyzing said control conditions using fuzzy logic which converts the control conditions into qualitative items, utilizing a membership function, and combines the qualitative items, utilizing an inferential rule, to induce a quantitative item; generating a control coefficient based on said analyzing of said control conditions; and controlling said reactive power on the basis of said control coefficient and said control signal.
Claim 43
Independent Claim
117 words
A method of controlling a reactive power control system to regulate a reactive power of the reactive power control system, said method comprising: detecting the reactive power difference between said reactive power and a reference reactive power; generating a control signal having a predetermined relationship to said reactive power difference; establishing a plurality of control conditions; analyzing said control conditions using fuzzy logic which converts the control conditions into qualitative items, utilizing a membership function, and combines the qualitative items, utilizing an inferential rule, to induce a quantitative item; generating a control coefficient based on said analyzing of said control conditions; and controlling said reactive power on the basis of said control coefficient and said control signal.
Claim 44
Dependent Claim
125 words
A reactive power control device comprising: means for detecting a reactive power to be controlled; means for storing a reference reactive power; means for determining the reactive power difference between said detected reactive power and said reference reactive power; fuzzy logic means for: i) establishing a plurality of control conditions, ii) analyzing said control conditions, and iii) generating an output for controlling said reactive power such that: ∫.sup.A CΔQdt≧B, where: t is time, ΔQ is said reactive power difference, and A, B and C are parameters, said fuzzy logic means being arranged to vary at least one of said parameters A, B and C in dependence on said analyzing of said control conditions; and means for controlling said reactive power in accordance with said output.
Claim 45
Dependent Claim
125 words
A reactive power control device comprising: means for detecting a reactive power to be controlled; means for storing a reference reactive power; means for determining the reactive power difference between said detected reactive power and said reference reactive power; fuzzy logic means for: i) establishing a plurality of control conditions, ii) analyzing said control conditions, and iii) generating an output for controlling said reactive power such that: ∫.sup.A CΔQdt≧B, where: t is time, ΔQ is said reactive power difference, and A, B and C are parameters, said fuzzy logic means being arranged to vary at least one of said parameters A, B and C in dependence on said analyzing of said control conditions; and means for controlling said reactive power in accordance with said output.
Claim 46
Dependent Claim
114 words
A reactive power control device comprising: means for detecting a reactive power to be controlled; means for storing a reference reactive power; means for determining the difference between said detected reactive power and said reference reactive power; means for generating a control signal having a predetermined relationship to said reactive power difference; fuzzy logic means for establishing a plurality of control conditions, converting the control conditions into qualitative items, utilizing a membership function, combining the qualitative items, utilizing an inferential rule, to induce a quantitative item, and generating a control coefficient into on the quantitative item; and means for controlling said reactive power on the basis of said control signal and said control coefficient.
Claim 47
Dependent Claim
114 words
A reactive power control device comprising: means for detecting a reactive power to be controlled; means for storing a reference reactive power; means for determining the difference between said detected reactive power and said reference reactive power; means for generating a control signal having a predetermined relationship to said reactive power difference; fuzzy logic means for establishing a plurality of control conditions, converting the control conditions into qualitative items, utilizing a membership function, combining the qualitative items, utilizing an inferential rule, to induce a quantitative item, and generating a control coefficient into on the quantitative item; and means for controlling said reactive power on the basis of said control signal and said control coefficient.
Claim 48
Dependent Claim
130 words
A reactive power control system comprising: means for detecting a reactive power to be controlled; means for storing a reference reactive power; means for determining the reactive power difference between said detected reactive power and said reference reactive power; fuzzy logic means for: i) establishing a plurality of control conditions, ii) analyzing said control condition, and iii) generating an output for controlling said reactive power such that: ∫.sup.A CΔQdt≧B, where: t is time, ΔQ is said reactive power difference, and A, B and C are parameters, said fuzzy logic means being arranged to vary at least one of said parameters A, B and C in dependence on said analyzing of said control conditions; and a reactive power regulating device for regulating said reactive power on the basis of said output.
Claim 49
Dependent Claim
130 words
A reactive power control system comprising: means for detecting a reactive power to be controlled; means for storing a reference reactive power; means for determining the reactive power difference between said detected reactive power and said reference reactive power; fuzzy logic means for: i) establishing a plurality of control conditions, ii) analyzing said control condition, and iii) generating an output for controlling said reactive power such that: ∫.sup.A CΔQdt≧B, where: t is time, ΔQ is said reactive power difference, and A, B and C are parameters, said fuzzy logic means being arranged to vary at least one of said parameters A, B and C in dependence on said analyzing of said control conditions; and a reactive power regulating device for regulating said reactive power on the basis of said output.
Claim 50
Dependent Claim
117 words
A reactive power control system comprising: means for detecting a reactive power to be controlled; means for storing a reference reactive power; means for determining the difference between said detected reactive power and said reference voltage; means for generating a control signal having a predetermined relationship to said reactive power difference; fuzzy logic means for establishing a plurality of control conditions, converting the control conditions into qualitative items, utilizing a membership function, combining the qualitative items, utilizing an inferential rule, to induce a quantitative item, and generating a control coefficient based on the quantitative item; and a reactive power regulating device for controlling said reactive power on the basis of said control signal and said control coefficient.
Claim 51
Dependent Claim
117 words
A reactive power control system comprising: means for detecting a reactive power to be controlled; means for storing a reference reactive power; means for determining the difference between said detected reactive power and said reference voltage; means for generating a control signal having a predetermined relationship to said reactive power difference; fuzzy logic means for establishing a plurality of control conditions, converting the control conditions into qualitative items, utilizing a membership function, combining the qualitative items, utilizing an inferential rule, to induce a quantitative item, and generating a control coefficient based on the quantitative item; and a reactive power regulating device for controlling said reactive power on the basis of said control signal and said control coefficient.
Claim 52
Dependent Claim
155 words
Apparatus for controlling a voltage, comprising: means for detecting the voltage difference between said voltage and a reference voltage; means for establishing a plurality of control conditions; means for determining a new voltage difference such that: ∫.sup.A CΔVdt≧B, where: t is time, ΔV is said new voltage difference, and A, B and C are parameters; fuzzy logic means for analyzing said control conditions, converting the control conditions into qualitative items, utilizing a membership function, and combining the qualitative items, utilizing an inferential rule, to induce a quantitative item; fuzzy logic means for analyzing said control conditions, converting the control conditions into qualitative items, utilizing a membership function, and combining the qualitative items, utilizing an inferential rule, to induce a quantitative item; means for varying at least one of said parameters A, B and C based on said analyzing of said control conditions; and means for controlling said voltage on the basis of said quantitative item.
Claim 53
Dependent Claim
155 words
Apparatus for controlling a voltage, comprising: means for detecting the voltage difference between said voltage and a reference voltage; means for establishing a plurality of control conditions; means for determining a new voltage difference such that: ∫.sup.A CΔVdt≧B, where: t is time, ΔV is said new voltage difference, and A, B and C are parameters; fuzzy logic means for analyzing said control conditions, converting the control conditions into qualitative items, utilizing a membership function, and combining the qualitative items, utilizing an inferential rule, to induce a quantitative item; fuzzy logic means for analyzing said control conditions, converting the control conditions into qualitative items, utilizing a membership function, and combining the qualitative items, utilizing an inferential rule, to induce a quantitative item; means for varying at least one of said parameters A, B and C based on said analyzing of said control conditions; and means for controlling said voltage on the basis of said quantitative item.
Claim 54
Dependent Claim
15 words
Apparatus according to claim 32, further comprising means for varying said reference voltage with time.
Claim 55
Dependent Claim
13 words
Apparatus according to claim 32, wherein said control conditions include the absolute time.
Claim 56
Dependent Claim
19 words
Apparatus according to claim 32, wherein said control conditions include the trend of variation of said voltage with time.
Claim 57
Dependent Claim
17 words
Apparatus according to claim 32, wherein said control conditions include the value of V at any time.
Claim 58
Dependent Claim
23 words
Apparatus according to claim 32, wherein said control conditions include ∫ X ΔVdt and ∫ Y ΔVdt where X is different from Y.
Claim 59
Dependent Claim
31 words
Apparatus according to claim 32, further comprising means for evaluating the control of the voltage with time; and means for varying said control conditions based on said evaluating of said control.
Claim 60
Dependent Claim
107 words
Apparatus for controlling a voltage, comprising: means for detecting the voltage difference between said voltage and a reference voltage; means for generating a control signal having a predetermined relationship to said voltage difference; means for establishing a plurality of control conditions; means for analyzing said control conditions using fuzzy logic which converts the control condition into qualitative items, utilizing a membership function, and combines the qualitative items, utilizing an inferential rule, to induce a quantitative item; means for generating a control coefficient based on said analyzing of said control condition; and means for controlling said voltage on the basis of said control coefficient and said control signal.
Claim 61
Dependent Claim
107 words
Apparatus for controlling a voltage, comprising: means for detecting the voltage difference between said voltage and a reference voltage; means for generating a control signal having a predetermined relationship to said voltage difference; means for establishing a plurality of control conditions; means for analyzing said control conditions using fuzzy logic which converts the control condition into qualitative items, utilizing a membership function, and combines the qualitative items, utilizing an inferential rule, to induce a quantitative item; means for generating a control coefficient based on said analyzing of said control condition; and means for controlling said voltage on the basis of said control coefficient and said control signal.
Claim 62
Dependent Claim
28 words
Apparatus according to claim 39, wherein said control signal is such that: ∫ΔVdt≧D, where: t is time, ΔV is said voltge difference, and D is a constant parameter.
Claim 63
Dependent Claim
134 words
Apparatus for controlling a voltage control system to regulate a voltage of the voltage control system, said apparatus comprising: means for detecting the voltage difference between said voltage and a reference voltage; means for establishing a plurality of control conditions; means for determining a new voltage difference such that: ∫.sup.A CΔVdt≧B, where: t is time, ΔV is said new voltage difference, and A, B and C are parameters; means for varying at least one of said parameters A, B and C based on an analysis of said control conditions, said analysis being by fuzzy logic which converts the control conditions into qualitative items, utilizing a membership function, and combines the qualitative items, utilizing an inferential rule, to induce a quantitative item; and means for controlling said voltage in accordance with the new voltage difference.
Claim 64
Dependent Claim
134 words
Apparatus for controlling a voltage control system to regulate a voltage of the voltage control system, said apparatus comprising: means for detecting the voltage difference between said voltage and a reference voltage; means for establishing a plurality of control conditions; means for determining a new voltage difference such that: ∫.sup.A CΔVdt≧B, where: t is time, ΔV is said new voltage difference, and A, B and C are parameters; means for varying at least one of said parameters A, B and C based on an analysis of said control conditions, said analysis being by fuzzy logic which converts the control conditions into qualitative items, utilizing a membership function, and combines the qualitative items, utilizing an inferential rule, to induce a quantitative item; and means for controlling said voltage in accordance with the new voltage difference.
Claim 65
Dependent Claim
120 words
Apparatus for controlling a voltage control system to regulate a voltage of the voltage control system, said apparatus comprising: means for detecting the voltage difference between said voltage and a reference voltage; means for generating a control signal having a predetermined relationship to said voltage difference; means for establishing a plurality of control conditions; means for analyzing said control conditions using fuzzy logic which converts the control conditions into qualitative items, utilizing a membership function, and combines the qualitative items utilizing an inferential rule, to induce a quantitative item; means for generating a control coefficient based on said analyzing of said control conditions; and means for controlling said voltage on the basis of said control coefficient and said control signal.
Claim 66
Dependent Claim
120 words
Apparatus for controlling a voltage control system to regulate a voltage of the voltage control system, said apparatus comprising: means for detecting the voltage difference between said voltage and a reference voltage; means for generating a control signal having a predetermined relationship to said voltage difference; means for establishing a plurality of control conditions; means for analyzing said control conditions using fuzzy logic which converts the control conditions into qualitative items, utilizing a membership function, and combines the qualitative items utilizing an inferential rule, to induce a quantitative item; means for generating a control coefficient based on said analyzing of said control conditions; and means for controlling said voltage on the basis of said control coefficient and said control signal.
References Cited (Backward Citations)
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