| 引用本文: | 李翼翔,田震,唐英杰,查晓明,孙建军,胡宇飞,李锡林.考虑构网型与跟网型逆变器交互的孤岛微电网小信号稳定性分析[J].电力自动化设备,2022,42(8): |
| LI Yixiang,TIAN Zhen,TANG Yingjie,ZHA Xiaoming,SUN Jianjun,HU Yufei,LI Xilin.Small-signal stability analysis of island microgrid considering interaction between grid-forming converter and grid-following converter[J].Electric Power Automation Equipment,2022,42(8): |
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| 摘要: |
| 随着新能源在电力系统中的渗透率越来越高，低惯性成为以新能源为主体的新型电力系统的重要特征，极大影响了系统的同步稳定运行能力。由于缺少大电网的频率支撑，孤岛微电网在故障扰动下将产生频率偏移现象。同时考虑新能源渗透率和频率偏移的影响，研究低惯量孤岛微电网的小信号稳定性。低惯量微电网由构网型逆变器和跟网型逆变器组成，其中构网型逆变器采用虚拟同步机控制策略。首先建立了孤岛微电网的全阶小信号模型。应用特征值分析法，揭示了2种类型逆变器的功率渗透率对微电网系统小信号稳定性的影响规律。进一步利用参与因子法分析了系统参数和控制参数对微电网系统稳定性的影响程度。最后仿真结果验证了理论分析的准确性。研究成果为低惯量微电网中2类逆变器的容量规划、参数设计和控制器优化提供了理论支撑，旨在提高微电网的小扰动同步稳定性。 |
| 关键词: 低惯性微电网 新能源渗透率 构网型逆变器 跟网型逆变器 小信号稳定性 |
| DOI：10.16081/j.epae.202206025 |
| 分类号:TM712;TM464 |
| 基金项目:国家自然科学基金资助项目(52007134)；国家自然科学基金智能电网联合基金资助项目(U1866601)；中央高校基本科研业务费专项资金资助项目(2042021kf0014) |
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| Small-signal stability analysis of island microgrid considering interaction between grid-forming converter and grid-following converter |
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LI Yixiang, TIAN Zhen, TANG Yingjie, ZHA Xiaoming, SUN Jianjun, HU Yufei, LI Xilin
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School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China
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| Abstract: |
| With the increasing penetration of renewable energy in power system, low-inertia has become an important feature of the new power system with renewable energy as the main body, which greatly affects the synchronous and stable operation ability of the system. Due to lack of frequency support of the power grid, island microgrid will produce frequency offset under fault disturbance. The small signal stability of low-inertia island microgrid is studied by considering the influence of renewable energy penetration and frequency deviation. The low-inertia microgrid consists of grid-forming converter and grid-following converter, in which the grid-forming converter adopts a virtual synchronous generator control strategy. First of all, the full-order small-signal model of island microgrid is established. The eigenvalue analysis method is used to reveal the influence of the power penetration of two types of converters on the small-signal stability of the microgrid system. Furthermore, the participation factor method is used to analyze the influence of system parameters and control parameters on the stability of the microgrid system. Finally, the simulative results verify the accuracy of the theoretical analysis. The research results provide theoretical support for capacity planning, parameter design and controller optimization of two types of converters in low-inertia microgrid, aiming at improving the synchronous stability of microgrid with small disturbances. |
| Key words: low-inertia microgrid renewable energy penetration grid-forming converter grid-following converter small-signal stability |
