The research of parallel-connected power conversion system based on power series decoupling

2018 13th IEEE Conference on Industrial Electronics and Applications (ICIEA) Pub Date : 2018-05-01 DOI:10.1109/ICIEA.2018.8398044

Liu Zhao, W. Shuai, Qiu Yinqi, Xia Jie

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Abstract

The energy storage system can operate in two modes, including grid-connected mode and islanding mode. The current sharing control of multiple parallel-connected energy storage subsystems is discussed in this paper. Firstly, the circuit configuration of parallel-connected energy storage system based on centralized control is introduced, and the equivalent model is established. Then the expressions of active and reactive circulating current in parallel system are deduced and analyzed. The result shows that the circulating current is related to the output voltage as well as parallel impedance, and can be suppressed by adjusting the output voltage. Moreover, considering the coupling between active and reactive circulation and the static error of impedance, a current sharing control strategy based on power series decoupling is proposed. The decoupling controller is designed and verified to have good robustness. The experimental results show that regardless of various loads, the proposed control method can not only maintain the stability of system voltage and frequency, but also has good static and dynamic current sharing accuracy.

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基于功率串联解耦的并联功率转换系统研究

储能系统有并网模式和孤岛模式两种运行模式。本文讨论了多并联储能子系统的电流共享控制问题。首先，介绍了基于集中控制的并网储能系统的电路结构，并建立了等效模型。然后推导并分析了并联系统有功和无功循环电流的表达式。结果表明，回路电流与输出电压和并联阻抗有关，可以通过调节输出电压来抑制回路电流。此外，考虑到有功回路和无功回路之间的耦合以及阻抗静态误差，提出了一种基于功率串联解耦的电流共享控制策略。设计并验证了该解耦控制器具有良好的鲁棒性。实验结果表明，在各种负载下，所提出的控制方法不仅能保持系统电压和频率的稳定，而且具有良好的静态和动态电流共享精度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2018 13th IEEE Conference on Industrial Electronics and Applications (ICIEA)

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