Circulating current suppressing strategy for MMC-HVDC in the stationary frame

2016 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC) Pub Date : 2016-10-01 DOI:10.1109/APPEEC.2016.7779643

Jinyu Wang, Jun Liang, Chengfu Wang, Xiaoming Dong, Zhuo-di Wang, Zhengtang Liang

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引用次数: 2

Abstract

Proportional resonant (PR) controllers/repetitive controllers (RC) based circulating current suppressing strategies in the stationary frame are widely used in MMC because of their simpleness and effectiveness. Unfortunately, they cannot be directly used in MMC-HVDC systems since they can result in dc-line voltage ripples and thus deteriorate system performance and stability under unbalanced grid conditions. This paper studies the problem in detail and then proposes corresponding improved circulating current suppressing strategies for MMC-HVDC, in which newly designed zero-sequence circulating current controller is employed. The proposed strategies can effectively eliminate both circulating currents and dc-line voltage ripples for MMC-HVDC systems under balanced and unbalanced grid conditions. Hence, they greatly enhance the fault ride-through capability of MMC-HVDC systems without adding any control cost or the number of controllers. The theoretical analysis and the proposed strategies are both verified by an established MMC-HVDC simulation model in MATLAB/Simulink.

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固定框架下MMC-HVDC的循环抑制策略

基于比例谐振控制器(PR) /重复控制器(RC)的固定框架循环电流抑制策略以其简单有效的优点被广泛应用于MMC中。不幸的是，它们不能直接用于MMC-HVDC系统，因为它们会导致直流电压波动，从而在不平衡电网条件下降低系统性能和稳定性。本文对该问题进行了详细的研究，并提出了相应的改进的MMC-HVDC循环电流抑制策略，其中采用了新设计的零序循环电流控制器。本文提出的策略可以有效地消除MMC-HVDC系统在平衡和不平衡电网条件下的循环电流和直流电压波动。因此，它们在不增加任何控制成本和控制器数量的情况下，大大提高了MMC-HVDC系统的故障穿越能力。在MATLAB/Simulink中建立的MMC-HVDC仿真模型验证了理论分析和提出的策略。

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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2016 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)

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