A New Commutation Failure Suppression Method for Series Voltage Commutated Converter

被引：0

作者：

Deng L. ^{[1
]}

Zhou X. ^{[1
]}

Hong L. ^{[1
]}

Chen B. ^{[1
]}

Xia H. ^{[1
]}

Yin H. ^{[1
]}

Liu Y. ^{[1
]}

Zhu R. ^{[1
]}

机构：

[1] National Electrical Energy Conversion and Control Engineering Technology Research Center (Hunan University), Changsha

来源：

Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2021年 / 41卷 / 21期

基金：

中国国家自然科学基金;

关键词：

Commutation failure; Controllable capacitance voltage; New control strategy; Series voltage commutated converter (SVCC);

D O I：

10.13334/j.0258-8013.pcsee.202332

中图分类号：

学科分类号：

摘要：

To further improve the commutation failure suppression capability and operation stability of the series voltage commutated converter (SVCC), this paper proposed a new commutation failure (CF) suppression method. According to the degree of AC voltage drop, it could flexibly control the capacitor voltage value of the converter chain. By cooperating with the commutation process of the valve group, the pre-trigger pulse signal of the converter chain submodule was constructed, which solved the imbalance of the capacitor voltage during the operation of the SVCC converter chain submodule The problem has improved the resistance to commutation failure (CF) of the HVDC system. In addition, this paper also proposed a fault detection method suitable for SVCC. The fundamental voltage information of the power grid was quickly extracted through least error squares (LES) filters to detect power grid faults at the recipient and obtain a converter chain that characterizes the extent of the power grid failure at the recipient capacitor voltage control command. It was theoretically analyzed that the SVCC converter chain could provide more reactive power to the system during the capacitor voltage adjustment process, and reduce the reactive power demand of the converter. Finally, a model was built in the PSCAD/EMTDC for verification. The results show that the new SVCC control method can effectively improve the resistance to commutation failure (CF) of the HVDC system, and reduce the reactive power demand of the valve under the recipient grid. © 2021 Chin. Soc. for Elec. Eng.

引用

页码：7304 / 7313

页数：9

共 19 条

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