基于同步坐标系的三相电网软件锁相环仿真研究  

Simulation Study of Software Phase-Locked Loop Based on the Synchronous Reference Frame for Three-phase Grid

作　　者：鲁大岱[1] 方敏[1,2] 

机构地区：[1]安徽三联学院电子电气工程学院,合肥230601 [2]合肥工业大学电气与自动化工程学院,合肥230009

出　　处：《淮阴工学院学报》2015年第1期26-30,共5页Journal of Huaiyin Institute of Technology

基　　金：安徽省振兴计划新专业建设项目(2013zytz082);安徽三联学院校级科研项目资助(2014Z013)

摘　　要：风电场前期安装的部分硬件设备已不能更换,同时又要求实现低电压穿越功能,这就需要一种简单实用的方法来获取电网电压变化的信息。阐述了软件锁相环的基本结构和原理,从理论上分析系统的稳定性和跟随特性,用矢量解耦的方法研究了基于单同步旋转坐标系的软件锁相环的设计方法,用二阶系统的标准形式对调节器参数进行整定。根据实际条件,计算出用于仿真的各个系统控制参数。利用Matlab/Simulink软件搭建该仿真模型,并在平衡电网电压和不平衡电网电压情况下,对系统性能进行分析比较。仿真结果说明,同步坐标系方法能够获得较好的电网信息,三相平衡电网时适合采用单同步坐标系方法,电网平衡度大时适合采用双同步坐标系方法,该方法有一定的工程应用价值。Due to the part of he hardware equipment is unchangeable in a wind farm, and at the same time it requires to achieve the low vo rage ride through function, a simple and practical method is needed to obtain the information of grid voltage change. The basic structure and principle of software phase - locked loop were de- scribed, and the stability and following characteristics of the system were analyzed. A design method of software phase -locked loop was put forward based on the synchronous reference frame with vector decoupling method. Each simulation parameter of actual control system was calculated by tuning parameters of the regulator using the standard second - order system. The simulation model was built by using Matlab/Simulink, and the system per- formance was compared under the conditions of balanced and unbalanced power grid . The simulation results showed that the method of synchronous reference frame could obtain the grid information better. Single synchro- nous reference frame is suitable for three - phase balanced grid, and double synchronous reference frame is suit- able for three -phase unbalanced grid. The research result is valuable to engineering application.

关 键 词：电压矢量 软件锁相环 同步坐标系 仿真 

分 类 号：TN933[电子电信—信号与信息处理]