| 引用本文: | 褚文从,刘静利,李永刚,刘华志,李德奇.考虑源端特性的虚拟同步直驱风机小信号建模与稳定性分析[J].电力自动化设备,2022,42(8): |
| CHU Wencong,LIU Jingli,LI Yonggang,LIU Huazhi,LI Deqi.Small-signal modeling and stability analysis of virtual synchronous PMSG considering source characteristics[J].Electric Power Automation Equipment,2022,42(8): |
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| 摘要: |
| 传统虚拟同步机并网模型将直流侧等效为理想的直流电压源，难以匹配风电、光伏等动态特性复杂的分布式电源。为准确表征源端为直驱风机的虚拟同步机动态特性，首先建立了虚拟同步直驱风机并网系统的精细化小信号模型。在此基础上结合参量根轨迹和主导状态变量，分析了模型参数对稳定性的影响。随后，针对重合特征根提出基于运动轨迹差异的误差衡量指标，对比分析了传统虚拟同步机与虚拟同步直驱风机并网模型所得特征根的差异性。结果表明传统虚拟同步机并网模型因无法涵盖与直驱风机运行特性有关的主导特征根，在直驱风机惯量不匹配、频率下降或者线路阻抗变化时，稳定性分析不准确。最后，搭建虚拟同步直驱风机并网系统仿真模型，进一步验证了所提模型的精确性和结论的准确性。 |
| 关键词: 虚拟同步机 虚拟同步直驱风机 小信号模型 参与因子 稳定性分析 |
| DOI：10.16081/j.epae.202205047 |
| 分类号:TM614 |
| 基金项目:国网山东省电力有限公司科技项目(2020A-026) |
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| Small-signal modeling and stability analysis of virtual synchronous PMSG considering source characteristics |
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CHU Wencong1, LIU Jingli2, LI Yonggang1, LIU Huazhi1, LI Deqi1
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1.State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Baoding 071003, China;2.State Grid Weifang Power Supply Company, Weifang 261000, China
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| Abstract: |
| The model of traditional grid-tied VSG(Virtual Synchronous Generator) treats the DC side as an ideal DC voltage source, which is difficult to match the distributed power sources with complex dynamic characteristics, such as wind power and photovoltaics. In order to accurately characterize the dynamic performance of the VSG whose source is the direct-driven wind turbine, a refined small-signal model of the gird-tied virtual synchronous PMSG(Permanent Magnet Synchronous Generator) is established firstly. On this basis, combined with the parametric root locus and the dominant state variables, the influence of model parameters on stability is analyzed. Then, the eigenvalues obtained from the grid-tied model of the traditional VSG and the virtual synchronous PMSG are comparatively analyzed, and an error measurement index based on the difference of eigenvalues’ moving locus is proposed for the coincident eigenvalues. The results show that the traditional grid-tied VSG model cannot cover the dominant eigenvalues related to the characteristics of the direct-driven wind turbine, thus the stability analysis will be inaccurate when the inertia of wind turbine does not match, the frequency drops or the line impedance changes. Finally, a simulation model for the grid-tied virtual synchronous PMSG system is built, which further verifies the accuracy of the proposed model and the accuracy of the conclusions. |
| Key words: virtual synchronous generator virtual synchronous PMSG small-signal model participation factor stability analysis |
