光伏并网发电低电压穿越的一种新锁相方法

doi:10.16182/j.issn1004731x.joss.201806041

系统仿真学报 ›› 2018, Vol. 30 ›› Issue (6): 2328-2334.doi: 10.16182/j.issn1004731x.joss.201806041

光伏并网发电低电压穿越的一种新锁相方法

李波波^{1, 2}, 李守智¹, 张艳肖¹

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

收稿日期:2016-07-26 修回日期:2016-11-16 出版日期:2018-06-08 发布日期:2018-06-14
作者简介:李波波(1978-),女,浙江宁波,博士生,讲师,研究方向为电力电子及电气传动。
基金资助:
国家高科技研究发展计划(863计划) (2015AA050606)

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

Li Bobo^{1, 2}, Li Shouzhi¹, Zhang Yanxiao¹

1、Xi'an Jiaotong University City College, Xi'an 710018, China;
2 Institute of advanced manufacturing technology,School of mechanical engineering, Xi 'an jiaotong university, Xi'an 710049, China

Received:2016-07-26 Revised:2016-11-16 Online:2018-06-08 Published:2018-06-14

摘要/Abstract

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。

关键词: 光伏发电, 快速锁相, 二阶广义积分(DSOGI), 低电压穿越

Abstract: 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.

Key words: photovoltaic power, fast phase lock, second-order generalized integrator (DSOGI), low voltage ride-through (LVRT)

中图分类号:

TP29

李波波, 李守智, 张艳肖. 光伏并网发电低电压穿越的一种新锁相方法[J]. 系统仿真学报, 2018, 30(6): 2328-2334.

Li Bobo, Li Shouzhi, Zhang Yanxiao. New Phase-lock Method for Tracking Low-voltage Ride-through on Photovoltaic Inverters[J]. Journal of System Simulation, 2018, 30(6): 2328-2334.

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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

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