针对星形级联静止同步补偿器(STATCOM)校正不平衡负载过程中出现的相间电容电压失衡问题,分析计算补偿装置各相吸收的有功功率与其输出电流正负序分量之间的关系,指出负序电流的注入会在级联STATCOM三相之间产生不平衡功率,由此造成相间直流侧电容电压失衡.引入零序电压注入法来解决由负序电流注入校正不平衡负载带来的相间电容电压失衡的问题,从控制系统不发生过调制的限制条件,提出了级联型补偿装置输出不平衡电流能力的计算方法.最后,搭建MATLAB/Simulink仿真模型,验证了该控制算法的有效性.%The interphase DC capacitance voltage will be imbalanced, when the star-connected cascade circuit stat-ic synchronous compensator ( STATCOM) is used to correct the unbalanced load. The power of negative sequence current of STATCOM in each phase chain is derived, which makes it clear that the injection of negative sequence current produces unbalanced power between three phases. Zero sequence voltage injection method is introduced to balance the interphase DC capacitance voltage, and related control strategies and principles are researched. The capacity of unbalance load compensation is calculated from the limitation of the control system without over modula-tion. Finally, the MATLAB/Simulink simulation model is built to verify the control algorithm.
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