链式角接SVG不平衡补偿控制研究

Research on Unbalance Compensation Control of the Delta-connected Cascaded SVG

此处对链式角接静态无功发生器(SVG)不平衡补偿进行了深入研究,负序电流补偿以及不平衡电网电压会影响各链节功率平衡,间接引起直流侧电压不均衡。为使功率趋于再平衡,分析了注入零序电流的可行性,受初相位影响,直接求取零序电流较为麻烦,在旋转坐标系下零序电流的求取则变得相对简单。最后以高铁试,验线为背景对该算法进行验证,其结果充分证明了该算法的有效性。

The unbalance compensation of delta-connected cascaded static var generator(SVG) is deeply studied.The negative sequence current compensation and unbalanced grid voltage will affect the power balance of each link and indirectly cause the DC side voltage unbalance.In order to make the power tend to rebalance,the feasibility of injecting zero-sequence current is analyzed.It is difficult to calculate the zero-sequence current directly affected by the initial phase angle,in the rotating frame,the calculation of zero-sequence current becomes relatively simple.Finally,the high-speed railway test line is taken as the background to verify the algorithm,and the results fully prove the effectiveness of the algorithm.