Frequency control of voltage sourced converter-based multi-terminal direct current interconnected system based on virtual synchronous generator

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2023-12-07 DOI:10.24425/aee.2023.147421

I. Congshanl, P. I. H. E. Z. I. Z. H. X IAOWEI Z HANG, K. E. Z. Hao

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Abstract

: In response to the inability of the ﬂexible DC transmission system connected to the AC grid under conventional control strategies to provide inertia to the system as well as to participate in frequency regulation, a virtual synchronous generator (VSG) control strategy is proposed for a voltage source converter (VSC)-based multi-terminal high-voltage direct current (VSC-MTDC) interconnection system. First, the virtual controller module is designed by coupling AC frequency and active power through virtual inertia control, so that the VSC-MTDC system can provide inertia response for AC grid frequency. Second, by introducing the power margin of the converter station into the droop coeﬃcient, the unbalanced power on the DC side is reasonably allocated to reduce the overshoot of the DC voltage in the regulation process. Finally, the power regulation capability of the normal AC system is used to provide power support to the fault end system, reducing frequency deviations and enabling inter-regional resource complementation. The simulation model of the three-terminal ﬂexible DC grid is built in PSCAD/EMTDC, and the eﬀectiveness of the proposed control strategy is veriﬁed by comparing the conventional control strategy and the additional frequency control strategy.

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基于虚拟同步发电机的电压源变流器多端直流互联系统的频率控制

针对柔性直流输电系统在常规控制策略下无法为系统提供惯性和参与调频的问题，提出了一种基于电压源变换器(VSC)的多端高压直流(VSC- mtdc)并网系统的虚拟同步发电机(VSG)控制策略。首先，设计虚拟控制器模块，通过虚拟惯量控制将交流频率与有功功率耦合，使VSC-MTDC系统能够对交流电网频率提供惯量响应。其次，通过将换流站的功率余量引入下垂系数，合理分配直流侧的不平衡功率，减少直流电压在调节过程中的超调。最后，利用正常交流系统的功率调节能力为故障端系统提供电源支持，减少频率偏差，实现区域间资源互补。在PSCAD/EMTDC中建立了三端柔性直流电网的仿真模型，通过对比常规控制策略和附加频率控制策略，验证了所提控制策略的有效性。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.

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