先进的高压侧电压控制改善电压稳定性

Advanced high side voltage control improves voltage stability

基于常规的发电机励磁系统控制方法,通过引入补偿控制的方式,提出了一种改进的先进的高压侧电压控制(AHSVC)方法,并论述了其工作原理、实现方式及特性。现有的AHSVC方法没有计及发电机有功电流的影响,而改进方法根据严格的理论推导,在机端电压的计算中同时计及由发电机无功电流和有功电流引起的压降,并引入下降率电抗,以平衡并列运行发电机之间的电流和无功功率,通过机端电压设定值准确控制高压侧电压的目标设定值。通过数值仿真结果分析,证明了该改进方法的有效性和实用性。由于不需要任何高压侧反馈信号,所以易于实现且经济。

An improved AHSVC（Advanced High Side Voltage Control） is presented,which introduces supplemental control to conventional generator excitation system. Its working principle,characteristics and implementations are described. The existing AHSVC ignores the influence of active current on voltage stability,while the improved control considers the voltage drop caused by both active and reactive currents according to rigorous theoretic deduction in generator terminal voltage calculation and introduces the ramp reactance to balance the current and reactive power among the parallel generators. The high side voltage of a step- up transformer is controlled accurately by the setting of generator terminal voltage. Simulation results prove the effectiveness and practicability of the improved method. It is relatively cheap and easy to be implemented because no feedback signal from the high voltage side is needed.