一种改进的VSC-HVDC接入弱电网矢量控制策略

2019 IEEE 3rd Conference on Energy Internet and Energy System Integration (EI2) Pub Date : 2019-11-01 DOI:10.1109/EI247390.2019.9062034

Shuaihu Li, Canle Cao, Zhenyu Xiang

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引用次数: 3

摘要

基于电压源变换器(VSC)的高压直流输电系统近年来得到了广泛应用。然而，当与弱电网连接时，vdc的传输功率受到限制。这一现象的机理及解决方法仍是当前研究的热点。本文首先建立了包括锁相环在内的VSC外环控制的线性数学模型，然后利用小信号模型证明了弱电网络中VSC- hvdc连接的不稳定性，并分析了有功环和无功环之间的相互作用。结果表明，提高无功回路的响应速度有利于提高系统的稳定性，因此本文提出了一种改进的控制策略。在PSCAD/EMTDC中验证了该方法提高功率传输极限的有效性和分析的正确性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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An Improved Vector Control Strategy of VSC-HVDC Connected to Weak Power Grid

Voltage-sourced converter (VSC) based high voltage direct current (HVDC) transmission system has been widely employed in recent years. However, the transmission power of VSC-HVDC is limited when connected to a weak power grid. The mechanism and solution of this phenomenon are still the focus of current research. In this paper, the linear mathematical model of outer loop control of VSC including phase-locked loop is firstly established, then instability of VSC-HVDC connection in weak current network is proved by small signal model, and the interaction between active and reactive power rings is analyzed. It is concluded that the increase of the reactive loop response speed is beneficial to improve the stability of the system, and therefore an improved control strategy is proposed in this paper. Effectiveness of the method to improve the power transmission limit and the correctness of the analysis are verified in PSCAD/EMTDC.

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来源期刊

2019 IEEE 3rd Conference on Energy Internet and Energy System Integration (EI2)

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