换流站交流滤波器最优投入组数确定方法

Method for determining the optimal sets of switching on alternating current filters in converter stations

基于交直流混联系统解耦求解的思想,提出一种换流站交流滤波器最优投入组数和交直流系统之间最优无功交换量确定方法。对于解耦后的交直流系统,利用连续潮流方法得到换流站无功功率与交流母线电压之间的变化曲线,由此确定不同投切目标下直流输电换流站交流滤波器最优投入组数和最优无功交换量。以某省级交流电网及ZZ换流站为例,得到不同投切目标下换流站最优交流滤波器投入组数,在保证换流站交流母线电压合格的前提下,通过切换投切目标可以增大换流站交流滤波器的冗余度。

Based on the idea of decoupling of the alternating current/direct current(AC/DC)hybrid system, a method to determine the optimal sets of switching on AC filters in converter station was proposed. The optimal reactive power exchange capacity between AC and DC systems could be obtained. For the decoupled AC and DC systems, the variation curves between the reactive power of the converter station and the AC bus voltage were respectively obtained by using the continuation power flow method, the optimal sets of switching on AC filters in converter station and the optimal reactive power exchange capacity between AC and DC systems under different optimization objectives were determined. Taking a provincial AC power grid and ZZ converter station therein as an simulation example and using the proposed method obtain the optimal sets of switching on AC filters in converter stations under different switching targets, finally, the redundancy of AC filter in converter station could be increased by changing the switching target on the premise that the voltage of AC bus in converter station was qualified.