Apparatus and method for operating distributed generator in connection with power system
First Claim
1. An apparatus for operating a distributed generator in connection with a power system, comprising:
- an input unit which receives a parameter calculated using power system information and a voltage and a current at a point of common coupling with the distributed generator, with which the distributed generator is connected;
a calculation unit which calculates an operating power factor instruction value and an active output instruction value using the parameter and the voltage and current at the point of common coupling with the distributed generator input to the input unit;
a control communication unit which determines and transmits the operating power factor instruction value and the active output instruction value according to the voltage at the point of common coupling with the distributed generator input to the input unit and an admissible voltage upper limit at the point of common coupling with the distributed generator to the distributed generator,wherein active power and reactive power are generated by the distributed generator according to the transmitted operating power factor instruction value and active output instruction value, andthe operating power factor instruction value is a ratio of the active output to a reactive output of the distributed generator, which divides a line impedance corresponding to a section from the point of common coupling with the distributed generator to the substation into a resistance component and a reactance component and allows a voltage rise portion caused by an active output and the resistance component to be identical to a voltage drop portion caused by the reactive output and the reactance component.
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Accused Products
Abstract
An apparatus for operating a distributed generator in connection with a power system includes an input unit which receives a parameter calculated using power system information and a voltage and a current at a point of common coupling with the distributed generator, with which the distributed generator is connected, a calculation unit which calculates an operating power factor instruction value and an active output instruction value using the parameter and the voltage and current at the point of common coupling with the distributed generator input to the input unit, and a control communication unit which determines and transmits the operating power factor instruction value and the active output instruction value according to the voltage at the point of common coupling with the distributed generator input to the input unit and an admissible voltage upper limit at the point of common coupling with the distributed generator to the distributed generator.
82 Citations
15 Claims
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1. An apparatus for operating a distributed generator in connection with a power system, comprising:
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an input unit which receives a parameter calculated using power system information and a voltage and a current at a point of common coupling with the distributed generator, with which the distributed generator is connected; a calculation unit which calculates an operating power factor instruction value and an active output instruction value using the parameter and the voltage and current at the point of common coupling with the distributed generator input to the input unit; a control communication unit which determines and transmits the operating power factor instruction value and the active output instruction value according to the voltage at the point of common coupling with the distributed generator input to the input unit and an admissible voltage upper limit at the point of common coupling with the distributed generator to the distributed generator, wherein active power and reactive power are generated by the distributed generator according to the transmitted operating power factor instruction value and active output instruction value, and the operating power factor instruction value is a ratio of the active output to a reactive output of the distributed generator, which divides a line impedance corresponding to a section from the point of common coupling with the distributed generator to the substation into a resistance component and a reactance component and allows a voltage rise portion caused by an active output and the resistance component to be identical to a voltage drop portion caused by the reactive output and the reactance component. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for operating a distributed generator in connection with a power system, comprising:
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a main control device which calculates active power of the distributed generator and a parameter with respect to an interconnection line using power system information; a local controller which calculates an operating power factor instruction value of the distributed generator and an active output instruction value of the distributed generator using the parameter calculated at the main control device and a voltage and a current at a point of common coupling with the distributed generator in which the distributed generator is connected to a distribution system; and the distributed generator which generates the active power and reactive power according to the operating power factor instruction value and the active output instruction value calculated at the local controller, wherein the operating power factor instruction value is a ratio of the active output to a reactive output of the distributed generator, which divides a line impedance corresponding to a section from the point of common coupling with the distributed generator to the substation into a resistance component and a reactance component and allows a voltage rise portion caused by an active output and the resistance component to be identical to a voltage drop portion caused by the reactive output and the reactance component. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method of operating a distributed generator in connection with a power system, comprising:
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calculating a line impedance corresponding to a section from a point of common coupling with the distributed generator, at which the distributed generator is connected to the power system, to a substation; calculating a distributed generator operating power factor which restrains voltage fluctuations at the point of common coupling with the distributed generator using the line impedance, an active output of the distributed generator, and a reactive output of the distributed generator; and operating the distributed generator according to the distributed generator operating power factor, wherein the distributed generator operating power factor is a ratio of the active output of the distributed generator and the reactive output of the distributed generator, which allows a voltage rise portion caused by the active output of the distributed generator and a resistance component of the line impedance to be identical to a voltage drop portion caused by the reactive output of the distributed generator and a reactance component of the line impedance. - View Dependent Claims (15)
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Specification