| 引用本文: | 刘其辉,李开心,蔡希鹏,朱益华,罗超.基于规范形方法的并网变换器系统暂态同步稳定分析[J].电力自动化设备,2025,45(6):116-123. |
| LIU Qihui,LI Kaixin,CAI Xipeng,ZHU Yihua,LUO Chao.Transient synchronization stability analysis of grid-connected converter system based on normal form method[J].Electric Power Automation Equipment,2025,45(6):116-123. |
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| 摘要: |
| 锁相环(PLL)在电压源型变换器(VSC)并网系统中的非线性动力学特性，给新型电力系统的暂态同步稳定性分析带来了挑战，特别是在强非线性系统中。为此，针对具有较强非线性PLL的VSC并网系统，建立其暂态响应的2阶微分方程，并基于规范形方法推导PLL输出相位的解析解。在此基础上，分析系统的同步稳定机理，提出新的暂态稳定判据，揭示影响暂态同步稳定性的关键因素及规律。研究结果表明，VSC有功出力、电网电感、PLL的比例积分参数是影响暂态同步稳定性的主要因素。基于MATLAB/Simulink进行仿真与实验以验证所提方法的有效性，结果表明该方法能够提高电力系统暂态稳定性分析的准确性与可靠性。 |
| 关键词: 并网变换器 非线性分析 规范形方法 锁相环 暂态同步稳定性 |
| DOI：10.16081/j.epae.202503013 |
| 分类号:TM464 |
| 基金项目:国家重点研发计划项目(2023YFB4203200,2023YFB4203204)；中国南方电网有限责任公司科技项目(1500002023030103FZ00101) |
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| Transient synchronization stability analysis of grid-connected converter system based on normal form method |
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LIU Qihui1, LI Kaixin1, CAI Xipeng2,3, ZHU Yihua2,3, LUO Chao2,3
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1.State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China;2.China Southern Power Grid Co.,Ltd.,Guangzhou 510623, China;3.Electric Power Research Institute of China Southern Power Grid Co.,Ltd.,Guangzhou 510663, China
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| Abstract: |
| The nonlinear dynamic characteristics of phase-locked loop(PLL) in voltage source converter(VSC) grid-connected system bring challenges to the transient synchronization stability analysis of new power systems, especially in strongly nonlinear systems. To address this, aiming at the VSC grid-connected system with strong nonlinear PLL, the second-order differential equation of its transient response is established, and the analytical solution of PLL output phase is derived based on the normal form method. On this basis, the synchronization stability mechanism of the system is analyzed, a new transient stability crite-rion is proposed, and the key factors and rules affecting the transient synchronization stability are revealed. The research results show that the active power output of VSC, the inductance of power grid and the proportional-integral parameters of PLL are the main factors affecting the transient synchronization stability. Simulation and experiment based on MATLAB/Simulink are carried out to verify the effectiveness of the proposed method. The results show that the proposed method can improve the accuracy and reliability of transient stability analysis for power system. |
| Key words: grid-connected converter nonlinear analysis normal form method phase-locked loop transient synchronization stability |
