열차 무효전력제어를 통한 급전계통 전압안정도 향상

In case of extended feeding or simultaneous multi starts within the same feeding system, even though the trains in service have favorable load characteristics of p.f. 1.0, the reactive power loss of the feeder becomes great and this makes the voltage stability worse or in the most severe case leads to the voltage collapse eventually. In this paper, the optimal reactive power compensation of each PWM train, which has the controllability of p.f. over both leading and lagging region, has been studied through the solution of global optimization problem of the feeding section. In addition, by using the singular values of load flow’s Jacobian, the effects of the optimization to the improvement of voltage stability have been studied. The results from the simulation to the sample system show that the voltage stability of the system has been improved to the considerable revel.