Abstract：The ring bipolar DC distribution network suffers from insufficient power flow control degrees of freedom, which leads to uncontrollable power flow in some transmission lines. Besides, there is a coupling between different poles. In this regard, a triple active bridge power flow controller (TAB-PFC) based unbalanced power flow suppression strategy is proposed. Meanwhile, the decoupling control of TAB-PFC is studied. Firstly, the influence of unbalanced receiving-end voltage and power of renewable energy on power flow and line losses is studied. Subsequently, the expressions of line current and output voltage of TAB-PFC under constant power control are derived. Moreover, the small-signal model of the ring bipolar DC distribution network with TAB-PFC is established. On this basis, the decoupling matrix is introduced to realize the approximate decoupling between the positive and negative control loops, which improves the dynamic performance of the control system. A simulation model of the ring bipolar DC distribution network with TAB-PFC is established in MATLAB/Simulink, and an experimental platform is built. The effectiveness of TAB-PFC in suppressing unbalanced power and the proposed decoupling are verified through simulation and experimental results.
何大禄, 廖建权, 王强钢. 基于三有源桥串并联直流潮流控制器的环形双极直流配电网不平衡潮流抑制[J]. 电工技术学报, 2022, 37(11): 2837-2848.
He Dalu, Liao Jianquan, Wang Qianggang. Triple Active Bridge Power Flow Controller Based Unbalanced Power Flow Suppression for Ring Bipolar DC Distribution Network. Transactions of China Electrotechnical Society, 2022, 37(11): 2837-2848.
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