级联型STATCOM的电压前馈空间矢量调制策略

Research on Voltage Feedforward Space Vector Modulation Strategy for Cascaded STATCOM

针对级联STATCOM的单元直流电压平衡控制问题,基于传统SVM调制方法,提出一种带有电压前馈的空间矢量调制(FFSVM)策略。详述了新调制策略的算法,以及控制系统的设计。仿真结果表明,电压前馈空间矢量调制策略在单元直流电压不平衡的条件下能够输出有良好的电压波形,且具有平衡STATCOM各单元直流电压的能力。

To solve the problem of DC-link voltage imbalance in cascaded STATCOM,this paper introduces a Voltage Feedforward Space Vector Modulation（FFSVM）strategy based on conventional Space Vector Modulation method.The algorithm of this modulation strategy and the control system design are described.Simulation results demonstrate that this strategy achieves good output voltage performance under the condition of DC-link voltage imbalance and is capable of balancing DC-link voltage of each unit in STATCOM.