| 引用本文: | 方正,黄云辉,严文博,王栋,唐金锐,谢长君,周克亮.构网型与跟网型变流器交互作用对并联系统小干扰稳定性的影响分析[J].电力自动化设备,2025,45(2):134-142. |
| FANG Zheng,HUANG Yunhui,YAN Wenbo,WANG Dong,TANG Jinrui,XIE Changjun,ZHOU Keliang.Influence analysis of interaction between grid-forming and grid-following converters on small interference stability of parallel system[J].Electric Power Automation Equipment,2025,45(2):134-142. |
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| 摘要: |
| 跟网型变流器具有电流源特性，构网型变流器具有电压源特性，两者并联接入交流电网时控制特性更加复杂，会引起新的稳定性问题。为探究构网型与跟网型变流器并联接入弱电网的稳定性，建立了构网型与跟网型变流器并联系统接入弱电网的稳定性分析模型和交互作用分析模型，并定义了自影响分量和互影响分量来量化表征构网型与跟网型变流器之间的相互作用程度。结合伯德图和模态分析法，通过研究不同运行点和不同控制参数下互影响分量幅频特性和系统主导模态变化轨迹，来分析构网型与跟网型变流器之间的相互作用对系统稳定性的影响规律。结果表明，弱电网下构网型与跟网型变流器之间相互作用程度的提升将有利于增强系统稳定性。 |
| 关键词: 构网型变流器 跟网型变流器 相互作用 稳定性分析 小信号建模 |
| DOI：10.16081/j.epae.202410003 |
| 分类号:TM712;TM46 |
| 基金项目:广东省基础与应用基础研究基金资助项目(2023A1515240052)；国家自然科学基金智能电网联合基金重点支持项目(U24B20103)；国家重点研发计划项目(2021YFB2601602) |
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| Influence analysis of interaction between grid-forming and grid-following converters on small interference stability of parallel system |
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FANG Zheng1, HUANG Yunhui1,2, YAN Wenbo1, WANG Dong1, TANG Jinrui1, XIE Changjun1, ZHOU Keliang1
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1.State Key Laboratory of Maritime Technology and Safety, Wuhan University of Technology, Wuhan 430070, China;2.Shenzhen Research Institute of Wuhan University of Technology, Shenzhen 518000, China
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| Abstract: |
| The grid-following converters have the characteristics of current source, while the grid-forming converters have the characteristics of voltage source. The control characteristics of the two converters are more complex when they are connected to the AC power grid in parallel, which causes new stability problems. To explore the stability of parallel connection of grid-forming and grid-following converters to the weak grid, the stability analysis model and the interaction analysis model for the parallel system of grid-forming and grid-following converters to the weak power grid are established. The self-impact components and the mutual-impact components are defined to quantitatively characterize the degree of interaction between grid-forming and grid-following converters. Combining the Bode diagram and modal analysis method, the amplitude-frequency characteristics of the mutual influence components and the dominant mode change trajectory of the system under different operating points and control parameters are studied to analyze the impact principle of the interaction between grid-forming and grid-following converters on system stability. The results indicate that the improvement of the interaction between grid-forming and grid-following converters under weak power grid is benefit for enhancing system stability. |
| Key words: grid-forming converter grid-following converter interaction stability analysis small signal modeling |
