MICRO-GRID SYSTEM USING SYNCHRONOUS CONDENSER

摘要

PROBLEM TO BE SOLVED: To stabilize a power grid while establishing protection coordination.SOLUTION: A micro-grid system 1 comprises a power grid 2 to which a power grid stabilizer 25 comprising a synchronous condenser 251 for controlling reactive power to be output to the power grid 2 by using a voltage control unit 252 and the voltage control unit 252's field magnet 253 is connected, the power grid supplying power from distributed power supply devices including renewable energy devices 21, 22 and continuous power generation devices 23, 24 to loads 261, 262 via a circuit breaker 264. The synchronous condenser 251, when short-circuit has occurred on the load 262 side from the circuit breaker 264, operates in coordination with the continuous power generation devices 23, 24 controlled so as to start running and operates as circuit breaker operation means for supplying a short-circuit current having a magnitude capable of operating the circuit breaker 264 to the circuit breaker 264.SELECTED DRAWING: Figure 1