光伏并网发电低电压穿越的一种新锁相方法  

New Phase-lock Method for Tracking Low-voltage Ride-through on Photovoltaic Inverters

作　　者：李波波[1,2] 李守智 张艳肖[1] Li Bobo;Li Shouzhi;Zhang YanxiaoI(, Xi＇an Jiaotong University City College, Xi＇an 710018, China;Institute of advanced manufacturing technology, School of mechanical engineering, Xi ＇an jiaotong university, Xi＇an 710049, China)

机构地区：[1]西安交通大学城市学院,陕西西安710018 [2]西安交通大学机械学院先进制造技术研究所,陕西西安710049

出　　处：《系统仿真学报》2018年第6期2328-2334,共7页Journal of System Simulation

基　　金：国家高科技研究发展计划(863计划)(2015AA050606)

摘　　要：光伏发电的低电压穿越问题,是光伏并网逆变器的一个关键问题。针对电网不对称故障下光伏逆变器低电压穿越的锁频锁相问题,基于双二阶广义积分(DSOGI)算法的正负序分离思想,提出一种快速的双二阶广义积分锁频锁相(DSOGI-FLL-PLL)方法。利用一种简洁的FLL锁频为正负序分离提供频率适应性,同时运用传统锁相环对电网侧电压锁相,可以有效减小不对称故障时的锁相环的响应时间和锁相误差。仿真结果表明:将该方法用来处理光伏逆变器的低电压穿越问题,可以节省约2/3的锁频锁相响应时间。The low-voltage ride-through in photovoltaic power generation is a key problem for photovoltaic inverters connected to grid. Aiming at the frequency-and phase-locking of low-voltage ride-through on the photovoltaic inverter during asymmetric fault on the grid and using positive and negative sequence separation, a dual second-order generalized integral frequency-and phase-locking algorithm（DSOGI-FLL-PLL） is proposed, and a simple FLL is used so that positive and negative sequence separation can be performed for various frequencies. The conventional phase-lock-loop（PLL） is also used to capture the grid-side voltage, which greatly reduces response time and error of PLL during asymmetric faults on the grid. Simulation results show that this method, when applied to track low-voltage ride-through on photovoltaic inverter connected to grid, can save about two third of the frequency-lock and phase-lock response time.

关 键 词：光伏发电 快速锁相 二阶广义积分(DSOGI) 低电压穿越 

分 类 号：TP29[自动化与计算机技术—检测技术与自动化装置]