Analytical Analysis on Nonlinear Transient Stability of Phase-locked Loop Type Grid-connected Converter in Weak Power Grid
Basic Research|更新时间:2025-06-16
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Analytical Analysis on Nonlinear Transient Stability of Phase-locked Loop Type Grid-connected Converter in Weak Power Grid
Automation of Electric Power SystemsVol. 46, Issue 24, Pages: 76-84(2022)
作者机构:
1.中国科学院电工研究所,北京市 100190
2.中国科学院大学电子电气与通信工程学院,北京市 100049
作者简介:
基金信息:
National Natural Science Foundation of China(52177123);National Key R&D Program of China(2019YFE0125900);the “Transformational Technologies for Clean Energy and Demonstration”, Strategic Priority Research Program of the Chinese Academy of Sciences(XDA21050100)
XIONG Jiawang,KONG Li,YE Hua,et al.Analytical Analysis on Nonlinear Transient Stability of Phase-locked Loop Type Grid-connected Converter in Weak Power Grid[J].Automation of Electric Power Systems,2022,46(24):76-84.
XIONG Jiawang,KONG Li,YE Hua,et al.Analytical Analysis on Nonlinear Transient Stability of Phase-locked Loop Type Grid-connected Converter in Weak Power Grid[J].Automation of Electric Power Systems,2022,46(24):76-84. DOI: 10.7500/AEPS20211107004.
Analytical Analysis on Nonlinear Transient Stability of Phase-locked Loop Type Grid-connected Converter in Weak Power Grid
Power electronic converters have the characteristics of small inertia
and fast and complex dynamic process
which bring severe challenges to the transient analysis of new power systems. Especially in weak grid conditions
the nonlinear characteristics of the phase-locked loop make the stability analysis of the grid-connected converter system more complicated. However
the key nonlinear characteristics are ignored in the traditional transient analysis method
and it is difficult to obtain a simple and practical stability criterion. To solve the above problems
a second-order nonlinear dynamics model based on the disturbance variable of the grid-connected converter system is established. The averaging method of the nonlinear vibration discipline is introduced to solve the model and obtain the low-order approximate analytical solution
and then the stability criterion of the grid-connected converter system in the weak grid environment is derived. Based on the theoretical derivation
the effects of model nonlinear terms
phase-locked loop control parameters and system short-circuit ratio on system transient stability are analyzed. Finally
the validity of the proposed method and the correctness of the analysis results are verified through the simulations and experiments.
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