基于功率传递的同期并列装置实现SSSC功能的仿真

本文针对基于功率传递的电网间同期并列装置转换为静止同步串联补偿器的复合系统,建立了并网装置转换为SSSC后的等效模型,根据SSSC既可进行容性补偿又可进行感性补偿的双重补偿的特点,分析了SSSC调节潮流的过程以及接入SSSC前后输电线路电流的变化情况。为减小短路故障情况下短路电流对系统的影响,本文利用SSSC可等效为感性阻抗的特点对不同短路故障电流进行了限制,从而提高了现有设备的综合利用率。在PSCAD/EMTDC中搭建了含SSSC的等效模型,仿真结果表明SSSC可有效调节线路输送的潮流,并验证了当系统发生短路故障时SSSC具有一定的限流功能。

Simulation of Implementing SSSC Function Converting from Grid Paralleling Device Based on Power Through Transmission

In this paper,in view of the composite system which is converted from grid paralleling device into static synchronous series compensator(SSSC)on the basis of power transmission,the equivalent model after the transmission from the paralleling device into SSSC is set up.According to the dual compensation characteristic that SSSC can perform both capacitiveand inductive compensation,the process of regulating power flow by SSSC and the change of transmission line current before and after SSSC connected to the system are analyzed.In order to reduce the impact of short-circuit current on the system in the case of short-circuit fault,in this paper,the different short circuit fault current is limited with the feature that SSSC can be equivalently inductive impedance,thus improving the comprehensive utilization rate of the existing equipment.The equivalent model including SSSC is built in PSCAD/EMTDC.The simulation result show that SSSC can effectively adjust the power flow of line transmission and verify that SSSC has a definite current limiting function when the system has a short circuit fault.