含风电的真双极混合型MMC-MTDC系统故障穿越及能量耗散控制

曹帅; 向往; 林卫星; 文劲宇

引用本文:	曹帅,向往,林卫星,等.含风电的真双极混合型MMC-MTDC系统故障穿越及能量耗散控制[J].电力系统保护与控制,2019,47(7):39-48.
	CAO Shuai,XIANG Wang,LIN Weixing,et al.Fault ride-through and energy dissipation control of bipolar hybrid MMC-MTDC integrating wind farms[J].Power System Protection and Control,2019,47(7):39-48

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含风电的真双极混合型MMC-MTDC系统故障穿越及能量耗散控制
曹帅¹,向往¹,林卫星²,文劲宇¹
(1.强电磁工程与新技术国家重点实验室(华中科技大学电气与电子工程学院)，湖北武汉 430074; 2.特变电工新疆新能源股份有限公司，新疆乌鲁木齐 830011)

摘要:

为解决柔性直流电网的故障问题，采用混合型模块化多电平换流器搭建双极四端直流电网。设计了单极换流器故障及直流线路故障无闭锁运行策略。系统无闭锁运行期间并网点交流电压稳定，风机可维持正常运行。考虑到故障期间风机持续并网输出功率，根据风电场出力设计了耗散电阻自适应分级投入策略，通过与风机内部的斩波电阻的配合，耗散掉多余的能量。最后，通过PSCAD/EMTDC的多组仿真，验证了混合型柔性直流电网的故障无闭锁运行及能量耗散的有效性。

关键词: 混合型MMC 真双极MTDC风电并网换流器退出运行直流故障穿越分级能量耗散

DOI：10.7667/PSPC180511

分类号:

基金项目:国家重点研发计划项目资助(2018YFB0904600);国家电网公司科技项目资助“±500 kV柔性直流电网运行特性与控制技术研究”

Fault ride-through and energy dissipation control of bipolar hybrid MMC-MTDC integrating wind farms

CAO Shuai¹,XIANG Wang¹,LIN Weixing²,WEN Jinyu¹

(1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Hubei Electric Power Security and High Efficiency Key Laboratory (School of Electrical and Electronic Engineering, Huazhong University of Science and Technology), Wuhan 430074, China;2. TBEA SunOasis Co., Ltd, Urumchi 830011, China)

Abstract:

To solve the faults in high-voltage direct current grid (HVDC grid), hybrid Modular Multilevel Converter (MMC) is adopted to set up a bipolar four-terminal DC grid. The MMC non-blocking operation strategies of unipolar converter fault and DC line fault are designed. During the fault operation, the AC voltage at the grid-connection point is stable and the wind turbine can maintain normal operation. Considering the continuous output wind power in the fault period, an adaptive step-by-step control strategy of dissipative resistance is designed, taking the output wind power as criteria. The excess energy is dissipated by cooperating with the dissipation resistance and chopper resistance inside the direct-drive wind turbine. Finally, the simulation based on PSCAD/EMTDC platform verifies the MMC unblocking fault ride-through operation of hybrid MTDC grid and proves the effectiveness of its fault energy dissipation. This work is supported by National Key Research and Development Program of China (No. 2018YFB0904600) and Science and Technology Project of State Grid Corporation of China “Research on Operation Characteristics and Control Technology of ±500 kV HVDC Grid”.

Key words: hybrid MMC real bipolar MTDC integrating wind power converter out of operation DC fault ride-through graded energy dissipation

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