静止同步补偿器直流侧电压的最优动态分级控制

Optimal Dynamic Hierarchical Control of the STATCOM DC Side Voltage

应用开关周期平均建模法结合瞬时无功理论推导出静止同步补偿器(static synchronous compensator,STATCOM)的直流侧电压数学模型。基于此数学模型提出最优动态分级控制策略。该策略依据调制指数的最优范围和无功功率对STATCOM的直流侧电压进行最优动态分级控制。与直流侧电压为恒值的控制策略相比,最优动态分级控制策略减小了STATCOM的输出电压和电流总谐波畸变率及开关应力,提高了装置效率,并且不影响STATCOM补偿无功的动态性能。仿真和试验结果证明了STATCOM直流侧电压数学模型的正确性和最优动态分级控制策略的有效性。

The DC side voltage mathematical model of static synchronous compensator （STATCOM） was established by switch period averaging modeling and instantaneous reactive power theory. Based on this model, the optimal dynamic hierarchical control strategy was proposed. According to the optimal range of modulation index and the reactive power, the STATCOM DC side voltage was regulated in different levels. The optimal dynamic hierarchical control strategy led to the low total harmonic distortion of voltage and current, the small switches stress, the high efficiency, and the similar transient response for STATCOM compared with that keeping the DC side voltage constant. The simulation and experimental results illustrate the accuracy of the DC side voltage mathematical model and the validity of the optimal dynamic hierarchical control strategy.