DC Pole-to-ground Fault Ride-through Strategy of Hybrid HVDC System Based on LCC and Hybrid MMC

被引：0

作者：

Zhang D. ^{[1
]}

Fan Z. ^{[2
]}

Xu H. ^{[1
]}

Miao S. ^{[2
]}

Wang Y. ^{[1
]}

Liu Z. ^{[2
]}

机构：

[1] Economics & Technology Research Institute, State Grid Hubei Electric Power Company, Wuhan

[2] State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan

来源：

Gaodianya Jishu/High Voltage Engineering | 2020年 / 46卷 / 06期

关键词：

Arm energy balance; DC pole-to-ground (PTG) fault; Fault ride through; Fundamental current injection; Hybrid HVDC; Hybrid modular multilevel converter;

D O I：

10.13336/j.1003-6520.hve.20200615027

中图分类号：

学科分类号：

摘要：

Line commutated converter (LCC) is adopted on the rectifier side of hybrid HVDC system, and hybrid Modular Multilevel Converter based on full bridge sub-module and half bridge sub-module(FH-MMC) is adopted on the inverter side. DC Pole-to-ground fault is the main fault type of HVDC system. When DC Pole-to-ground fault occurs, the hybrid HVDC system needs to switch operation mode. Bipolar operation is transformed to monopole operation on the LCC side, and the AC voltage DC bias and fault current are eliminated by outputting negative level voltage on the FH-MMC side. The power flow characteristics of FH-MMC arms under this operation mode are analyzed. Energy imbalance occurs between upper and lower arms. the sub-module capacitance voltage of the fault arm keeps rising, which affects the safe operation of switching devices. Therefore, an energy balance strategy based on fundamental frequency circulating current injection is proposed in this paper. The proposed control strategy ensures that the normal pole can still transmit half of the rated power under DC pole-to-ground fault, and realize uninterrupted operation of HVDC system. Finally, a hybrid HVDC simulation model is built in PSCAD/EMTDC, and the simulation results verify effectiveness of the proposed control strategy. © 2020, High Voltage Engineering Editorial Department of CEPRI. All right reserved.

引用

页码：2072 / 2080

页数：8

共 21 条

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