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国网浙江省电力有限公司电力科学研究院,浙江省杭州市 310014
许烽(1988—),男,通信作者,博士,高级工程师,主要研究方向:高压直流输电和柔性直流输电及大功率电力电子技术。E-mail:xuf_1988@163.com
陆翌(1979—),男,博士,教授级高级工程师,主要研究方向:高压直流输电和柔性直流输电及大功率电力电子技术
黄晓明(1969—),男,硕士,教授级高级工程师,主要研究方向:继电保护与新型电力系统技术。
收稿:2022-07-20,
修回:2022-12-11,
网络出版:2023-05-17,
纸质出版:2023-07-25
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许烽,陆翌,黄晓明等.基于无变压器型电压源换流器的柔性多状态开关零序抑制策略[J].电力系统自动化,2023,47(14):124-129.
XU Feng,LU Yi,HUANG Xiaoming,et al.Zero-sequence Suppression Strategy of Flexible Multi-state Switch Based on Transformerless Voltage Source Converter[J].Automation of Electric Power Systems,2023,47(14):124-129.
许烽,陆翌,黄晓明等.基于无变压器型电压源换流器的柔性多状态开关零序抑制策略[J].电力系统自动化,2023,47(14):124-129. DOI: 10.7500/AEPS20220720004.
XU Feng,LU Yi,HUANG Xiaoming,et al.Zero-sequence Suppression Strategy of Flexible Multi-state Switch Based on Transformerless Voltage Source Converter[J].Automation of Electric Power Systems,2023,47(14):124-129. DOI: 10.7500/AEPS20220720004.
无变压器型柔性多状态开关(FMS)具有设备紧凑化、高效化等特点,但由于缺少隔离变压器,存在故障后供区间的零序分量交互传递叠加、相互影响等问题。文中首先对无变压器型两电平电压源换流器(VSC)的回路特性进行了分析,并在此基础上利用对称分量法建立了正序、负序和零序系统,揭示了交直流系统间零序分量传递的原因和关键要素。然后,基于理论分析结果,从直流波动抑制和交流零序抑制两方面入手,提出了故障端和非故障端VSC的两种零序抑制策略。最后,在PSCAD/EMTDC内建立了一个两端背靠背型FMS仿真模型,仿真结果验证了理论分析的正确性,以及两种零序抑制策略的有效性。
The transformerless flexible multi-state switch (FMS) has the characteristics of compactness and high efficiency. But due to the lack of an isolation transformer
it has problems such as the interactive transmission and superposition of zero-sequence components between different supply areas after a fault. Based on the circuit characteristic analysis of the transformerless two-level voltage source converter (VSC)
this paper establishes the positive-sequence
negative-sequence and zero-sequence systems by using the symmetrical component method
which reveals the reasons and key elements of the transmission of zero-sequence components between AC and DC systems. Based on the theoretical analysis results
two zero-sequence suppression strategies of VSC at the fault and non-fault ends are proposed from the two aspects of DC fluctuation suppression and AC zero-sequence suppression. Finally
a two-terminal back-to-back FMS simulation model is established in PSCAD/EMTDC. The simulation results verify the correctness of the theoretical analysis and the effectiveness of the two zero-sequence suppression strategies.
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