摘要
随着大规模新能源发电设备的接入,可能会形成对外呈感性的弱电网,这将影响逆变器系统的稳定性。针对级联H桥光伏并网系统,分别考虑锁相环和电压前馈的影响,对输出阻抗进行建模,并基于阻抗稳定判据分析延时时间、锁相环带宽、谐振前馈系数对并网系统稳定性的影响。最后,提出一种通过相角补偿来增强级联H桥光伏并网逆变器在弱电网条件下稳定性的控制技术。仿真和实验结果验证了理论分析的正确性及所提方法的可行性。
With the access of large-scale new energy power generation equipment,a weak grid may be formed,which will affect the stability of the inverter system.Aiming at the cascaded grid-connected systems considering the effects of PLL and voltage feedforward,the output impedance is modeled.The effects of time delay,bandwidth of phase-locked loop,coefficient of resonance feedforward on the stability of the grid-connected system is analyzed based on the impedance stability criterion.Finally,a phase compensation method is used to improve the stability of the cascaded H-bridge grid connected inverter under weak grid.Simulation and experimental results verify the correctness of the theoretical analysis and the feasibility of the proposed method.
作者
杨思为
张兴
毛旺
胡玉华
王明达
王付胜
Yang Siwei;Zhang Xing;Mao Wang;Hu Yuhua;Wang Mingda;Wang Fusheng(School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,China;National and Local Joint Engineering Laboratory for Renewable Energy Access to Grid Technology(Hefei University of Technology),Hefei 230009,China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2022年第1期398-405,共8页
Acta Energiae Solaris Sinica
基金
国家自然科学基金重点项目(51937003)
国家重点研发计划(2018YFB1500703)。
关键词
光伏
弱电网
级联H桥逆变器
稳定性
阻抗判据
相角补偿
photovoltaic
weak grid
CHB inverter
stability
impedance criterion
phase compensation
