现代电子技术2025，Vol.48Issue(20)：56-62,7.DOI:10.16652/j.issn.1004-373x.2025.20.010
提升并网逆变器在弱电网下稳定性的惯性锁相环策略
Inertial phase-locked loop strategy for improving stability of grid-connected inverter in weak grid
摘要
Abstract
In allusion to the poor stability of photovoltaic power generation system under weak grid conditions due to low damping and low inertia of phase-locked loop(PLL)grid-connected inverters,a new-type inertia phase-locked loop(IPLL)structure is proposed to enhance system stability.The main circuit topology of a three-phase LC-filter grid-connected inverter and the PLL control loop under weak grid conditions are introduced.By introducing inertial control parameters to improve system damping and inertia,a new-type IPLL structure is proposed,and its mathematical model is established to analyze its unit step response characteristics.The effectiveness of the IPLL in enhancing system stability is verified by the simulations and experiments.The simulation results show that the new-type IPLL can significantly improve the stability of grid-connected inverters under different short-circuit ratio conditions,reducing the amplitude of voltage and current oscillations.The experimental results show that in comparison with traditional PLL,IPLL can achieve system stability faster under weak power grid and extremely weak power grid conditions,and significantly improve the system's anti-disturbance ability and robustness.It further verifies the effectiveness of IPLL.关键词
并网逆变器/稳定性分析/弱电网/锁相环/短路比/单位阶跃响应Key words
grid-connected inverter/stability analysis/weak grid/phase-locked loop/short-circuit ratio/unit step response分类
信息技术与安全科学引用本文复制引用
卢文文,于少娟,刘立群..提升并网逆变器在弱电网下稳定性的惯性锁相环策略[J].现代电子技术,2025,48(20):56-62,7.基金项目
山西省基础研究计划面上项目(202203021221153) （202203021221153）
