SVC预防电压失稳的快速控制方法

在电压濒临失稳时,静止无功补偿器(SVC)可能因为输出无功功率不够快而无法阻止电压失稳,针对这种情况,提出了一种SVC预防电压失稳的快速控制方法。该方法以电压失稳预测(VIP)指标数值越限为启动条件,通过调整SVC电压参考值提升其无功输出速度,从而预防电压失稳。使用PSCAD/EMTDC和MATLAB的联合仿真进行算例分析,验证了此控制方法提升电压稳定性的有效性。该方法简单可靠,且仅调节SVC控制系统外部数据,不改变SVC原有的系统结构和参数,适用于实际系统,有很好的发展前景。

A Fast SVC Control Method for Voltage Stability

When voltage tends to instability, SVC （Static Var Compensator） may fail to prevent it due to the slow reactive power output speed. For this situation, an fast control method of SVC to prevent voltage instability is proposed. The out-of-limit of VIP（voltage instability predictor） is set as the starting condition of this method. The reactive power output speed of SVC is raised by adjusting the voltage reference of SVC controller, thus voltage instability is prevented. PSCAD/EMTDC and MATLAB joint simulation is adopted for example analysis, and the results prove that the control method improves voltage stability. Moreover, the method only adjusts external data of SVC control system, and the original structure and parameters of SVC control system are not changed, so it is easy to apply the method current actual power system.