基于桥臂能量预测的模块化多电平换流器子模块故障优化容错控制策略

doi:10.19595/j.cnki.1000-6753.tces.180406

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摘要子模块故障是模块化多电平换流器（MMC）常见的一种故障类型,将故障子模块旁路后,MMC将处于桥臂不对称运行状态。为使MMC系统在子模块旁路后依然能维持稳定运行,提出一种基于桥臂能量预测的MMC子模块故障容错控制策略。首先对各时刻桥臂子模块储存的能量进行动态预测,进而求得各时刻子模块电容电压的预测值,在不用附加环流抑制控制器情况下,实现对环流中不对称基频和二倍频谐波分量的有效抑制。该策略简化了系统控制的复杂度,既适用于桥臂子模块数不对称的运行状态也适用于正常运行状态。厦门柔性直流示范工程的电磁暂态仿真结果验证了所提出的容错优化控制策略的正确性。

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	郝亮亮
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	熊飞

关键词 ：模块化多电平换流器, 故障容错, 子模块故障, 环流

Abstract：Sub-module (SM) fault is a common fault type of modular multilevel converters (MMC). MMC will run under an asymmetrical state when SM was insulated. In order to maintain the stable operation of the MMC system, this paper presents a sub-module fault tolerant optimal control strategy of MMC based on estimation of bridge energy. The capacitor voltage of sub-module at each time is obtained by a dynamic prediction of the energy stored in the arm. Without the additional circulation suppression controllers, the asymmetric fundamental harmonic and the second harmonic current are suppressed. The proposed strategy simplifies the complexity of the controller, which is applicable to both the asymmetrical operating state and the normal operating state. Finally, the correctness of the proposed strategy is verified by the electromagnetic transient simulation results based on Xiamen HVDC project.

Key words： Modular multilevel converter (MMC) fault-tolerant control sub-modular fault circulating current

收稿日期: 2018-03-25 出版日期: 2018-09-03

PACS:

TM46

基金资助:国家重点研发计划资助项目（2017YFB0902600）

通讯作者: 张静女,1993年生,硕士研究生,研究方向为柔性直流输电。E-mail: 15121505@bjtu.edu.cn

作者简介: 郝亮亮男,1985年生,博士,副教授,硕士生导师,研究方向为直流输电、电力系统主设备保护与监测。E-mail: llhao@bjtu.edu.cn

引用本文:

郝亮亮, 张静, 顾亚旗, 陈争光, 熊飞. 基于桥臂能量预测的模块化多电平换流器子模块故障优化容错控制策略[J]. 电工技术学报, 2018, 33(16): 3697-3706. Hao Liangliang, Zhang Jing, Gu Yaqi, Chen Zhengguang, Xiong Fei. Sub-Module Fault Tolerant Optimal Control Strategy of Modular Multilevel Converter Based on Estimation of Bridge Energy. Transactions of China Electrotechnical Society, 2018, 33(16): 3697-3706.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.180406 https://dgjsxb.ces-transaction.com/CN/Y2018/V33/I16/3697

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