Distributed generation system and power system stabilizing method
First Claim
1. A distributed generation system, comprising:
- a distributed generation connected with a power system,a static var compensator connected with the power system at a point of connection between the distributed generation and the power system, andcontrol means for detecting an output of the distributed generation and for controlling the static var compensator according to the detected output so that a voltage fluctuation developed at the point of connection attributable to the distributed generation is suppressed,means for detecting the voltage fluctuation at the point of connection attributable to an active power P of the distributed generation operated under a condition;
means for obtaining, based on the voltage fluctuation, a target value α
for ratios P/Q of the active power P to a reactive power Q, both generated by the distributed generation and the static var compensator; and
means for calculating a reactive power command Q* to be generated by the static var compensator on the basis of the target value α
;
wherein the control means controls the static var compensator according to the reactive power command Q*.
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Abstract
A distributed generation system that can suppress a voltage fluctuation caused by a distributed generation by an apparatus of a small power capacity in the distributed generation itself and stabilize the power system voltage without inserting interharmonic voltage or current into the power system and without interference among a plurality of distributed generations. Parameter α(t) varying with time is estimated based on fluctuating component ΔP of the active power P generated by the distributed generation and the voltage fluctuating component ΔV attributable to the distributed generation developed at the point of connection between the distributed generation and power system. The distributed generation produces reactive power Q=−αP or Q=−αΔP, to thereby suppresses only the voltage fluctuation of the power system attributable to the distributed generation.
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Citations
7 Claims
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1. A distributed generation system, comprising:
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a distributed generation connected with a power system, a static var compensator connected with the power system at a point of connection between the distributed generation and the power system, and control means for detecting an output of the distributed generation and for controlling the static var compensator according to the detected output so that a voltage fluctuation developed at the point of connection attributable to the distributed generation is suppressed, means for detecting the voltage fluctuation at the point of connection attributable to an active power P of the distributed generation operated under a condition; means for obtaining, based on the voltage fluctuation, a target value α
for ratios P/Q of the active power P to a reactive power Q, both generated by the distributed generation and the static var compensator; andmeans for calculating a reactive power command Q* to be generated by the static var compensator on the basis of the target value α
;wherein the control means controls the static var compensator according to the reactive power command Q*. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification