Fault Ride-through Control Strategy of MMC-HVDC System Under Asymmetric Grid Conditions

被引：0
|
作者：
Yu J. [1 ]
Liu C. [1 ]
Wang J. [1 ]
机构：
[1] State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Changping District, Beijing
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2020年 / 40卷 / 17期
关键词：
Asymmetrical fault; Distributed capacitor; Fault ride-through; Modular multilevel converter (MMC);
D O I：
10.13334/j.0258-8013.pcsee.190746
中图分类号：
学科分类号：
摘要：
The nonlinear coupling characteristic of modular multilevel converter (MMC) results in power oscillation under asymmetric conditions. A fault ride-through strategy based on average model of MMC system was proposed in this paper. By decoupling the circulating current, DC current and zero sequence current controller from the AC current controller, the unbalanced power caused by asymmetric AC fault was consumed inside the converter instead of propagating to the DC side. By realizing the energy management for distributed capacitor, those were balanced that the capacitor voltages of each valve, each bridge arm, each phase unit and each converter, improving stability of HVDC system under asymmetric conditions. The simulation results for the proposed strategy of PSCAD/EMTDC indicate that the characteristics of the non-faulty side converter are the same as those under the power flow step condition, and the faulty side converter still maintains good performance. © 2020 Chin. Soc. for Elec. Eng.
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页码：5653 / 5664
页数：11
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