Analysis and Control Strategy of DC Overvoltage in MMC-HVDC Grid

被引：0
|
作者：
Yang Y. [1 ]
Guo J. [1 ]
Wang S. [1 ]
Wang T. [1 ]
Li Y. [1 ]
Zhao B. [1 ]
Wu G. [1 ]
机构：
[1] State Key Laboratory of Power Grid Security and Energy Conservation, China Electric Power Research Institute, Haidian District, Beijing
来源：
Dianwang Jishu/Power System Technology | 2019年 / 43卷 / 05期
关键词：
DC overvoltage; MMC-HVDC grid; Unbalanced power; Wind farm island;
D O I：
10.13335/j.1000-3673.pst.2018.0588
中图分类号：
学科分类号：
摘要：
Based on basic operation principle of modular multi-level converter (MMC), charging process of bridge arm capacitor with unbalanced power in MMC-HVDC grid is studied, and the expression of relationship between DC voltage and unbalanced power is obtained. Existing fault-ride-through strategies mainly include emergency reduction of wind power and additional installation of energy dissipation devices. This paper proposes an improved emergency modulation strategy to suppress DC overvoltage by adjusting input numbers of sub-module adaptively. This strategy can reserve sufficient time to cut the unbalanced power and achieve fault-ride-through. An electromagnetic transient model is built in PSCAD/EMTDC, and effectiveness of the strategy is verified with simulation. © 2019, Power System Technology Press. All right reserved.
引用
收藏
页码：1586 / 1592
页数：6
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