考虑限流的基于直流电压同步的构网型换流器稳定判据
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TM712

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国家自然科学基金资助项目(52277122);国家资助博士后研究人员计划资助项目(GZB20240595)


Transient stability criterion of grid-forming converter based on DC voltage synchronization control considering current limit
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    摘要:

    针对限幅约束下构网型换流器的同步稳定性,文中建立考虑电流限幅的基于直流电压同步控制的单换流器并网系统的切换动力学模型。不考虑限幅约束的构网型换流器在故障清除后只会稳定在定电压控制模式,而限幅约束下的构网型换流器可能稳定在定电压控制模式或定电流控制模式。因此,文中提出分段等面积定则研究所提模型的暂态稳定性,并推导系统临界切除角的解析表达式,揭示饱和电流角对系统稳定性的影响机理。此外,文中提出一种提升系统暂态稳定裕度的电流饱和角设置方法,不仅能够避免系统在故障切除后锁定在电流限幅模式,还可以获得最大的临界切除角和减速面积。最后,文中基于MATLAB/Simulink仿真验证了临界切除角表达式和电流饱和角设置方法的正确性。

    Abstract:

    In order to address the synchronization stability of grid-forming converters considering current limiting constraints,a switching dynamic model of the system of a single converter connected to the grid based on direct current voltage synchronization control (DVSC) strategy considering current limiting is established in this paper. Grid-forming converters without current limiting constraints will only operate in the constant voltage control mode after fault clearance,while those with current limiting constraints may stabilize in different modes like constant voltage control mode or constant current control mode. Therefore,the transient stability of studied model is analyzed using the segmental equal area criteria (SEAC) in this paper and the analytical expression of the critical clearing angle (CCA) is derived,revealing the mechanism by which the saturation current angle affects the stability of the system. In addition,a setting method of current saturation angle that can enhance the transient stability margin is proposed in this paper,which not only prevents the system from being locked into the current limiting mode after fault clearance but also achieves the maximum critical clearing angle and deceleration area. Finally,simulations based on MATLAB/Simulink are carried out to verify the correctness of the expression of critical clearing angle and setting method of current saturation angle.

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刘菁锐,屠增泽,张宇飞,张阳,李佳朋,李宇骏.考虑限流的基于直流电压同步的构网型换流器稳定判据[J].电力工程技术,2025,44(2):3-12

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  • 收稿日期:2024-08-01
  • 最后修改日期:2024-10-27
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  • 在线发布日期: 2025-04-03
  • 出版日期: 2025-03-28
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