中国电机工程学报2015，Vol.35Issue(19)：5022-5029,后插16,9.DOI:10.13334/j.0258-8013.pcsee.2015.19.021
弱电网下单相光伏并网逆变器锁频环同步方法
A Frequency Locked Loop Grid Synchronization Method of Single-phase Grid-connected PV Inverter Under Weak Grid
摘要
Abstract
One of the main electrical characteristics of weak grid is the high grid impedance, which will easily lead to grid voltage waveform distortion. Distorted grid voltage can resultin deviation or failure of the phase-locked loop of photovoltaic (PV) inverter, and power quality will deteriorate. In order to tackle this problem, targeting on the LC-type PV inverter,a synchronization method is proposed based on the second order generalized integrator frequency locked loop (SOGI-FLL). Initially, the impact of various grid states, especially the weak grid, on the inverter is analyzed. Then the operation principle of SOGI-FLL and its implementation method are set forth in detail. Simulation and experimental results demonstrate the validity of this synchronization method in grid voltage disturbance and zero-crossing oscillation. This synchronization method has strong robustness and adaptability for grid voltage changes. Compared with the conventional zero-crossing synchronization method, the SOGI-FLL synchronization method can improve the reliability of grid-connected PV inverters under weak grid.关键词
弱电网/光伏并网逆变器/同步方法/锁频环Key words
weak grid/gird-connected PV inverter/synchronization method/frequency lock loop (FLL)分类
信息技术与安全科学引用本文复制引用
刘桂花,曹小娇,王卫..弱电网下单相光伏并网逆变器锁频环同步方法[J].中国电机工程学报,2015,35(19):5022-5029,后插16,9.基金项目
国家自然科学基金项目(51307033) （51307033）
台达环境与教育基金会资助(DREK2013003) （DREK2013003）
中央高校基本科研业务费专项资金资助(HIT.NSRIF.2014016). Project Supported by National Natural Science Foundation of China (51307033) （HIT.NSRIF.2014016）
Power Electronics Science and Education Development Program of Delta Environmental & Educational Foundation (DREK2013003) （DREK2013003）
Fundamental Research Funds for the Central Universities (HIT.NSRIF.2014016). （HIT.NSRIF.2014016）
