弱电网下基于准静态模型的混合控制微电网逆变器同步稳定性研究

doi:10.19595/j.cnki.1000-6753.tces.201512

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摘要当多逆变器并联接入弱电网时,高电网阻抗与逆变器间的相互作用,易引发逆变器并网同步过程中的稳定性问题。针对弱电网下电流电压混合控制型微电网（HMG）逆变器的同步稳定性,通过建立准静态模型,分析锁相环（PLL）和虚拟同步机（VSG）在HMG系统中的同步机制,讨论PLL和VSG同步环间相互作用对电流（电压）控制型逆变器稳态工作点的影响,进而得到弱电网下HMG同步稳定性与电网阻抗、电网电压之间的关系。在此基础上,考虑弱电网下发生的电网电压跌落故障,对HMG同步稳定性与各逆变器稳态工作点、同步环参数之间的关系进行分析。实验结果验证了理论分析的正确性,为实际中HMG给定指令和同步参数的合理配置提供指导。

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	于彦雪
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关键词 ：弱电网, 混合控制型微电网, 多逆变器, 准静态模型, 同步稳定性

Abstract：When the multi-inverters are parallelly connected to the weak grid, interactions of the high grid impedance and inverters are easy to result in synchronization stability problems. To study the synchronization stability of the hybrid microgrid (HMG) consisting of current- and voltage-controlled inverters in weak grid, the quasi-static models were developed to analyze the synchronization mechanism of the phase locked loop (PLL) and virtual synchronous generator (VSG) in the HMG, and discuss the influences of interactions between the PLL and VSG on the steady-state operating points of inverters in the HMG. Thus, relationships of the synchronization stability with the grid impedance and grid voltage were derived in the HMG. Then, consider the grid voltage drop fault occurred in weak grid, relationships of the synchronization stability with the steady-state operating point and the synchronization loop parameters were analyzed in the HMG. The experimental results verified theoretical analyses. Researches in this paper can help the HMG to choose the running references and synchronization parameters reasonably.

Key words： Weak grid hybrid microgrid multi-inverter quasi-static model synchronization stability

收稿日期: 2020-11-14

PACS:

TM464

基金资助:国网黑龙江公司科技项目“分布式能源高渗透接入对地区末端电网稳定性影响及抑制方法研究”资助（52243718000T）

通讯作者: 李浩昱男,1974年生,教授,博士生导师,研究方向为微网环境变换器协调控制技术、极端环境电能变换与控制。E-mail：lihy@hit.edu.cn

作者简介: 于彦雪女,1991年生,博士研究生,研究方向为弱电网下并网逆变器建模及稳定性。E-mail：yuyanxueppkz@163.com

引用本文:

于彦雪, 马慧敏, 陈晓光, 郑雪梅, 李浩昱. 弱电网下基于准静态模型的混合控制微电网逆变器同步稳定性研究[J]. 电工技术学报, 2022, 37(1): 152-164. Yu Yanxue, Ma Huimin, Chen Xiaoguang, Zheng Xuemei, Li Haoyu. Synchronous Stability Research of Inverters in Hybrid Microgrid Based on the Quasi-Static Models under Weak Grid. Transactions of China Electrotechnical Society, 2022, 37(1): 152-164.

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