高可靠性三相多功能并网变换器研究

doi:10.11930/j.issn.1004-9649.202206056

摘要/Abstract

摘要： 三相多功能并网变换器（three-phase multi-functional grid-connected converter，TMGC）在实现微电网并网的同时，复合了电能质量治理功能，具有重要的应用前景。为提高TMGC的运行可靠性，提出了TMGC的重构技术及其容错控制策略。首先，采用一种适用于变换器开路故障的故障诊断方法，当开路故障发生时，依据变换器故障前后中点电压偏差的特征和实时开关状态来进行故障诊断；其次，提出一种TMGC的重构拓扑，实现TMGC二次故障的重构，容错空间大；然后，提出TMGC的容错控制策略，结合谐波抑制控制、PQ控制及脉冲重置方法，使TMGC故障后能继续实现并网微电网的功率控制及谐波抑制功能，最终形成高可靠性三相多功能并网变换器（high reliability three-phase multi-functional grid-connected converter，HRTMGC）；最后，通过Matlab/Simulink仿真，结果证明了所提重构技术及其容错控制策略的有效性。

关键词: 微电网, 并网变换器, 故障诊断, 重构, 谐波抑制

Abstract: The three-phase multi-functional grid-connected converter (TMGC) combines the power quality control function while realizing the connection with microgrid, which also has an important application prospect. In order to improve the operation reliability of TMGC, the reconstruction technology and fault tolerant control strategy of TMGC are proposed in this paper. Firstly, a fault diagnosis method for the open circuit fault of the converter is adopted. The fault diagnosis method is carried out according to the characteristics of midpoint voltage deviation before and after fault and the real-time switching state. Secondly, a TMGC reconstruction topology is proposed to realize the reconstruction of TMGC when secondary faults occur, which can enlarge the fault tolerance space. Then, the fault-tolerant control strategy of TMGC is proposed, which combines harmonic suppression control, PQ control and pulse reset method, so that TMGC can continue to realize power control and harmonic suppression functions of grid-connected microgrid after failure. Thus, a high reliability three-phase multi-functional grid-connected converter (HRTMGC) is formed. Finally, the Matlab/Simulink simulation results prove the effectiveness of the proposed reconstruction technology and its fault-tolerant control strategy.

Key words: microgrid, grid-connected converter, fault diagnosis, reconstruction, harmonic suppression

黎燕, 程馨, 黄祖梁, 杨琢. 高可靠性三相多功能并网变换器研究[J]. 中国电力, 2023, 56(5): 172-181.

LI Yan, CHENG Xin, HUANG Zuliang, YANG Zhuo. Research on High Reliability Three-Phase Multi-function Grid-Connected Converter[J]. Electric Power, 2023, 56(5): 172-181.

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链接本文: https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.202206056

https://www.electricpower.com.cn/CN/Y2023/V56/I5/172

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