| 引用本文: | 屠增泽,刘菁锐,吴司敏,申宇奇,李佳朋,李宇骏,周少泽,王伟.考虑限流的双PSL并联系统的切换机理及稳定性分析[J].电力自动化设备,2025,45(9):135-142. |
| TU Zengze,LIU Jingrui,WU Simin,SHEN Yuqi,LI Jiapeng,LI Yujun,ZHOU Shaoze,WANG Wei.Switching mechanism and stability analysis of dual PSL system considering current limiting[J].Electric Power Automation Equipment,2025,45(9):135-142. |
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| 摘要: |
| 考虑电流限幅的构网型换流器在暂态稳定性分析中会表现为一切换系统，其切换机理尚不明确。针对考虑电流限幅的双功率同步环(PSL)系统，限流措施采用饱和电流算法，推导了相角描述下的双机系统的切换边界，发现考虑电流限幅的双机系统在1个相角周期内存在4种工作状态和4个切换边界，且其中2个切换边界的位置分别与2台换流器的饱和电流角设定值有关。在此基础上，进一步对所研究系统进行暂态稳定性分析，获得了4种工作状态下的稳定平衡点，并通过改变2台换流器的饱和电流角设定值对稳定平衡点进行配置，避免了其中一台换流器被锁定在限流模式的情况。仿真验证了所提理论的正确性和有效性。 |
| 关键词: 构网型换流器 功率同步环 电流限幅 切换边界 暂态稳定性 饱和电流角 |
| DOI：10.16081/j.epae.202504013 |
| 分类号: |
| 基金项目:国家电网有限公司科技项目(5100-202340742A-3-4-SY) |
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| Switching mechanism and stability analysis of dual PSL system considering current limiting |
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TU Zengze1, LIU Jingrui1, WU Simin2, SHEN Yuqi1, LI Jiapeng1, LI Yujun1, ZHOU Shaoze3, WANG Wei3
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1.School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China;2.State Grid Shanghai Electric Power Company, Shanghai 200122, China;3.State Grid Electric Power Research Institute, Nanjing 211102, China
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| Abstract: |
| In the transient stability analysis, the grid-forming converter considering current limiting will appear as a switching system, and its switching mechanism is still unclear. Aiming at a dual power synchronization loop(PSL) system considering current limiting, where the current limiting measure uses a current saturation algorithm. The switching boundaries of the dual-machine system in terms of phase angle are derived. It is found that the dual-machine system considering current limiting has four working states and four switching boundaries within a phase angle period, and the positions of two switching boundaries are related to the saturation current angle settings of the two converters. Based on this, the transient stability of the studied system is further analyzed, obtaining the stable equilibrium points of the four working states. The stable equilibrium points are configured by changing the current saturation angle set values of the two converters, which can avoid the situation that one converter is locked in the current limiting control mode. The simulation verifies the correctness and effectiveness of the proposed theory. |
| Key words: grid-forming converter power synchronization loop current limiting switching boundary transient stability current saturation angle |
