Evaluation and Improvement of Security and Stability of Jiangsu Receiving-End Power Grid with Hybrid Multi-Infeed DC

doi:10.11930/j.issn.1004-9649.202007229

Abstract

Abstract: The hybrid infeed DC system usually refers to a hybrid infeed DC system with line commutated converter (LCC) and modular multilevel converter (MMC). At present, the hybrid multi-infeed DC system with multiple DC terminal locations has been adopted in planning of receiving-end power grids, but its impact on the system security and stability is not clear. In order to quantitatively evaluate the security and stability of the receiving-end power grid with hybrid multi-infeed DC, this paper summarizes seven evaluation indexes and proposes an evaluation method. Then, a case study of Jiangsu power grid is carried out, which shows that the security and stability of Jiangsu receiving-end power grid is insufficient, and the most serious problem is the commutation failure of DC system. To solve the existing problems, two schemes are proposed: the scheme 1 is to change the inverter-side LCC of Binchang DC into MMC, and the scheme 2 is to construct a multi-terminal DC system mainly based on MMC. Finally, the application effects of two schemes are evaluated quantitatively, which shows that the security and stability of receiving-end power grid will be improved using MMC and constructing multi terminal DC system, and also proves the effectiveness of the proposed evaluation method.

Key words: hybrid multi-infeed DC, receiving-end power grid, security and stability, commutation failure, multi-terminal DC system

HUANG Zhiguang, CAO Lu, LI Jianhua, ZHANG Junli, WANG Guoteng, XU Zheng. Evaluation and Improvement of Security and Stability of Jiangsu Receiving-End Power Grid with Hybrid Multi-Infeed DC[J]. Electric Power, 2021, 54(9): 55-65.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202007229

https://www.electricpower.com.cn/EN/Y2021/V54/I9/55

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