Abstract Parallel bidirectional power converters (BPCs) play an important role in achieving mutual support between the two grids and in improving the power quality. One of the difficulties of the study is how to coordinated control BPCs to simultaneously realize the dual goals of economically distribute transmission power among BPCs and the high dynamic quality. In view of this, this paper proposes an adaptive coordinated optimal control method for the parallel BPCs. First, taking the minimization of the sum of the power losses of BPCs as the objective, the economically optimal distribution scheme for power transmission among parallel BPCs is calculated. Second, a primary voltage-regulated controller is designed, outer loop of the primary voltage-regulated controller can distribute the dynamic transmission power among BPCs according to the power margin of each BPC, to avoid overloading BPCs, and inner loop of the primary voltage-regulated controller can realize the decoupling of the output variable and the interference variable, to improve the dynamic voltage quality. Third, a secondary voltage-regulated controller is designed, it can make the dc bus voltage restore to the rated value quickly after power disturbance occurs, and ensure the economically optimal distribution of the transmission power among BPCs after the system reaches the steady state. Finally, the stability of the proposed control method is illustrated and conclusions are verified.

中文翻译：

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交直流混合微电网并联双向功率变换器自适应协调优化控制方法

摘要 并联双向功率变换器(BPC)在实现两网相互支持、提高电能质量方面发挥着重要作用。研究的难点之一是如何协调控制BPC，以同时实现在BPC之间经济地分配传输功率和高动态质量的双重目标。鉴于此，本文提出了一种并行BPC的自适应协调优化控制方法。首先，以BPC的功率损耗总和最小为目标，计算出并联BPC间电力传输的经济最优分配方案。其次，设计了初级稳压控制器，一次调压控制器的外环可以根据每个BPC的功率裕度在BPC之间分配动态传输功率，避免BPC过载，一次调压控制器的内环可以实现输出变量和输出变量的解耦。干扰变量，改善动态电压质量。第三，设计了二次调压控制器，它可以在发生电源扰动后，使直流母线电压迅速恢复到额定值，保证系统达到稳态后输电功率在BPC之间的经济优化分配。最后，说明了所提出的控制方法的稳定性，并验证了结论。初级稳压控制器内环可实现输出变量与干扰变量的解耦，提高动态电压质量。第三，设计了二次调压控制器，它可以在发生电源扰动后，使直流母线电压迅速恢复到额定值，保证系统达到稳态后输电功率在BPC之间的经济优化分配。最后，说明了所提出的控制方法的稳定性，并验证了结论。初级稳压控制器内环可实现输出变量与干扰变量的解耦，提高动态电压质量。第三，设计了二次调压控制器，它可以在发生电源扰动后，使直流母线电压迅速恢复到额定值，保证系统达到稳态后输电功率在BPC之间的经济优化分配。最后，说明了所提出的控制方法的稳定性，并验证了结论。并确保系统达到稳态后，BPC 之间传输功率的经济优化分配。最后，说明了所提出的控制方法的稳定性，并验证了结论。并确保系统达到稳态后，BPC 之间传输功率的经济优化分配。最后，说明了所提出的控制方法的稳定性，并验证了结论。