构网型储能变流器并网系统SISO环路增益建模与重塑控制

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摘要储能变流器是连接储能介质与电网的核心装备,当变流器控制参数与电网阻抗不匹配时,易出现失稳现象。为了分析构网型（GFM）储能变流器的并网稳定性,本文提出一种功率同步环主导的单输入单输出（SISO）环路增益模型,结合频域控制理论中的幅值、相位裕度实现对GFM储能变流器并网系统小干扰稳定裕度的量化分析,结果表明GFM储能变流器在弱电网下具有良好的稳定性,但是在强电网下系统稳定裕度不足;因此,提出一种基于虚拟阻抗的GFM储能变流器并网系统环路增益重塑控制策略,并研究虚拟电阻、虚拟电感对系统抗噪声干扰、稳态运行点及稳定性的综合影响规律,给出参数的整定建议。最后,通过Matlab/Simulink仿真模型证明了理论分析的正确性和有效性。

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	郭小龙
	杨桂兴
	张彦军
	周毅

关键词 ：构网型变流器, 储能, 小扰动稳定性, 虚拟阻抗

Abstract：The energy storage converter is the core equipment in connecting the energy storage system and the grid. However, the interaction between the converter control loops and the grid impedance easily causes small-signal instability of the system. In order to clarify the interaction stability between the grid-forming (GFM) energy storage converter and gird, this paper proposes a power synchronization loop dominated single input and single output (SISO) loop gain model. Based on concepts of traditional magnitude and phase margins in frequency-domain control theory, small-signal stability margins of GFM energy storage converter grid-connected system are quantitatively depicted. The results indicate that the GFM energy storage converter has enough stability margin under the weak grid, but it has insufficient stability margin under the strong grid. Therefore, a loop gain reshaping control based on virtual impedance in the GFM energy storage converter is proposed. Impacts of parameters in virtual impedance control on noise immunity, steady-state operation point and stability of the system are studied for tuning these parameters. Finally, the correctness and effectiveness of the theoretical analysis are verified by the simulation model in Matlab/Simulink.

Key words： grid-forming converter energy storage small-signal stability virtual impedance

收稿日期: 2022-10-26

基金资助:国家电网新疆电力有限公司科技项目（SGXJ0000TKJS2200419）

作者简介: 郭小龙（1983—）,男,博士,正高级工程师,主要研究方向为电力系统及其自动化。

引用本文:

郭小龙, 杨桂兴, 张彦军, 周毅. 构网型储能变流器并网系统SISO环路增益建模与重塑控制[J]. 电气技术, 2023, 24(2): 24-31. GUO Xiaolong, YANG Guixing, ZHANG Yanjun, ZHOU Yi. Modeling and reshaping control of single input and single output loop gain of the grid-forming energy storage converter grid-connected system. Electrical Engineering, 2023, 24(2): 24-31.

链接本文:

http://dqjs.cesmedia.cn/CN/Y2023/V24/I2/24

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