Voltage or reactive power control method and control device therefor

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.

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:
• .intg..sup.A C.DELTA.Vdt.gtoreq.V,
• where:
• t is time,
• .DELTA.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 control signal.

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.

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:
• .intg..sup.A C.DELTA.Vdt.gtoreq.B,
• where:
• t is time,
• .DELTA.V 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.

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.

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:
• .intg..sup.A C.DELTA.Vdt.gtoreq.B,
• where:
• t is time,
• .DELTA.V 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.

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.

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.

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:
• .intg..sup.A C.DELTA.Qdt.gtoreq.B,
• where:
• t is time,
• .DELTA.Q 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.

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.

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:
• .intg..sup.A C.DELTA.Qdt.gtoreq.B,
• where:
• t is time,
• .DELTA.Q 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.

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.

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:
• .intg..sup.A C.DELTA.Qdt.gtoreq.B,
• where:
• t is time,
• .DELTA.Q 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.

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.

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:
• .intg..sup.A C.DELTA.Qdt.gtoreq.B,
• where:
• t is time,
• .DELTA.Q 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.

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.

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:
• .intg..sup.A C.DELTA.Vdt.gtoreq.B,
• where:
• t is time,
• .DELTA.V 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.

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.

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:
• .intg..sup.A C.DELTA.Vdt.gtoreq.B,
• where:
• t is time,
• .DELTA.V 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.

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.