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DC voltage control strategy of chain star STATCOM with second-order harmonic suppression

机译：具有二阶谐波抑制的星型STATCOM直流电压控制策略

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摘要

Chain static synchronous compensators (STATCOMs) with star structure produce second-order harmonic fluctuations on the DC side. This effect is often ignored and only the average voltage value is taken into consideration when describing this system for control purpose. In this study, the unbalance of per-phase DC voltages caused by active power absorbed and consumed by the chain is analysed. The steady-state expressions regarding the average capacitor voltage balancing between phase clusters as well as the suppression of second-order harmonic fluctuation are obtained, respectively, based on the injection of fundamental and third-order harmonic zero-sequence voltages. Although the expressions are helpful to understand the essence of DC capacitor voltage control, this method has complicated calculation process and the calculation results may be beyond the modulation limit. Therefore, it is not conducive in real-time control. For this reason, a new control strategy based on the instantaneous zero-sequence voltage injection is proposed. The evaluation function with the transient variables is established to get the instantaneous value of the zero-sequence voltage including fundamental and third-order harmonic components. The fundamental and third-order harmonic zero-sequence voltages are automatically allocated to fully use the remaining modulation capacity. Finally, simulation and experimental results are provided, which verifies the correctness of the theoretical analysis and the high performance of the proposed method.
机译：星形结构的链式静态同步补偿器（STATCOM）在直流侧产生二阶谐波波动。在描述此系统用于控制目的时，通常会忽略这种影响，并且仅考虑平均电压值。在这项研究中，分析了由链吸收和消耗的有功功率引起的每相直流电压的不平衡。基于基波和三阶谐波零序电压的注入，分别获得了有关相簇之间平均电容器电压平衡以及抑制二阶谐波波动的稳态表达式。虽然这些表达式有助于理解直流电容器电压控制的本质，但该方法的计算过程复杂，计算结果可能超出了调制极限。因此，这不利于实时控制。因此，提出了一种基于瞬时零序电压注入的新控制策略。建立具有瞬变变量的评估函数，以获取包括基波和三阶谐波分量在内的零序电压的瞬时值。自动分配基波和三阶谐波零序电压，以充分利用剩余的调制容量。最后提供了仿真和实验结果，验证了理论分析的正确性和所提出方法的高性能。

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