弱电网下光伏并网系统锁相环参数自适应控制  

Adaptive Control of Phase-Locked Loop Parameters of the Photovoltaic Grid-Connected System under W eak Grid

作　　者：武海涛[1,2] 张宁宁 曹志轩 温素芳 李磊[1] 李会珍 WU Haitao;ZHANG Ningning;CAO Zhixuan;WEN Sufang;LI Lei;LI Huizhen(School of Electric Power,Inner Mongolia University of Technology,Hohhot 010080,Inner Mongolia,China;Engineering Research Center of large-scale Energy Storage Technology,Ministry of Education,Hohhot 010080,Inner Mongolia,China)

机构地区：[1]内蒙古工业大学电力学院,内蒙古呼和浩特010080 [2]大规模储能技术教育部工程研究中心,内蒙古呼和浩特010080

出　　处：《电网与清洁能源》2024年第1期52-61,共10页Power System and Clean Energy

基　　金：内蒙古自然科学基金项目(2023MS05011);内蒙古自治区直属高校基本科研业务费项目(JY20220141)。

摘　　要：针对弱电网下PLL(phase-looked loop,PLL)会使并网逆变器的稳定性下降问题,提出一种锁相环带宽自适应控制策略来实现锁相环参数依据电网实时阻抗值来获得最优的控制参数,保证系统最佳控制性能和稳定运行,从而提升跟网型逆变器在弱电网下的对电网阻抗的适应能力。利用PSCAD/EMTDC进行仿真验证,仿真结果证明自适应控制策略正确、有效。As the PLL may decrease the stability of the grid-connected inverter under weak grid,a phase-locked loop bandwidth adaptive control strategy is proposed to realize the obtaining of the optimal control parameters by the phase-locked loop parameters based on the real-time impedance value of the grid,to ensure the optimal control performance of the system and the stable operation,so as to enhance the adaptive ability of the grid-following type of inverters to the impedance of the grid under weak grid.PSCAD/EMTDC is utilized for the simulation verification,and the simulation results prove that the adaptive control strategy proposed in the paper is correct and effective.

关 键 词：弱电网 锁相环 谐波线性化 稳定边界 参数自适应 

分 类 号：TM712[电气工程—电力系统及自动化]