功率同步型构网型变流器功率环建模及其差异性对暂态稳定的影响
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TM614;TM712

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国家自然科学基金资助项目(52207102)


Power loop modeling of grid-forming converter and the influence of difference on transient stability
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    摘要:

    电网故障时,构网型变流器容易暂态失稳而导致脱网。现有的方法对于构网型变流器故障穿越控制的研究较为全面,却鲜有分析功率环差异性及交互作用对暂态稳定性的影响。因此,文中基于几种功率同步型控制环,推导了适用于暂态工况的构网型变流器表达式和功率环模型,所提表达式能建立桥梁来分析控制环差异性对暂态稳定性的影响。其次,分析了构网型变流器功率环差异性对控制参数取值的影响,阐明了有功环的差异呈现为控制参数的缩放,无功环的差异体现在控制结构及参数的变动,进而导致不同的暂态特性。然后,描述了有功环和无功环差异性呈现出的相互作用,惯量促进了有功环对无功环的耦合,电压修正系数缓和了无功环对有功环的恶化。最后,归纳得到提高阻尼降低惯量有利于提高暂态功角和频率稳定性,较小的比例、积分参数和较大的电压修正参数有利于提高暂态电压稳定性的设计结论。

    Abstract:

    The grid-forming converter (GFM) is prone to transient instability,when a fault occurs in the power grid. At present,the research on voltage ride through control of GFM is comprehensive. However,the influence of power loop difference and interaction on transient stability is rarely analyzed. Therefore,the expression and power-loop model of GFM are derived for transient conditions,based on the typical power-synchronous loops. The expression establishes a bridge to analyze the influence of control loop differentiation. Secondly,the influence of power loop difference on the value of control parameters is analyzed. The difference of active loop is the scaling of control parameters,and the difference of reactive loop is the change of control structure and parameters. Then,the interaction regularity of power loop difference is described. The inertia promotes the coupling of active loop to reactive loop,and voltage correction coefficient alleviates the deterioration of reactive loop to active loop. Finally,the following conclusions are concluded. Increasing damping and decreasing inertia is beneficial to improve power angle and frequency stability,while smaller proportional,integral parameters and larger voltage correction parameters are beneficial to improve voltage stability.

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丁然,邵尹池,李咏凯,胡演,姚一鸣,贾焦心.功率同步型构网型变流器功率环建模及其差异性对暂态稳定的影响[J].电力工程技术,2025,44(2):111-122

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  • 收稿日期:2024-12-21
  • 最后修改日期:2025-02-26
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  • 在线发布日期: 2025-04-03
  • 出版日期: 2025-03-28
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