新型动态电压凹陷校正器研究

提出一种基于串并联的动态电压凹陷校正器(DVSC)补偿三相电力系统电压凹陷或隆起新方法,该方法较现有动态电压调节器(DVR)及配电静态补偿器(D-STATCOM)能在大幅降低成本的同时有效地提供保护。该方案基于电压升压变换电路,能够通过升压或降压快速校正电压,其主要特点是具有最小能量储存的单阶功率变换电路。介绍了新型电压控制拓扑、晶闸管旁路开关的交换逻辑。仿真和实验结果证明了该方法的有效性。

Research of dynamic voltage sag corrector

A series - parallel connected DVSC(Dynamic Voltage Sag Corrector) is designed to com pensate voltage sag and swell conditions in the three-phase power system. Compared with the DVR(Dynamic Voltage Regulator) and the D-STATCOM(Distribution STATic var COMpensator),it effectively provides protections at greatly reduced cost. Based on a voltage boost circuit,it is able to quickly correct the voltage by either boosting the input voltage during sags or reducing it during swells. Its key feature is the single stage power conversion circuit with the minimal stored energy. The new voltage control topology is presented,as well as the commutation logic for the thyristor bypass switch is provided. Experiments are carried out to verify its validity.