船舶电网改进型DDSRF-PLL相位跟踪方法研究  

Phase tracking method for ship grids by improved DDSRF-PLL

作　　者：李志华[1] 高岚[1] LI Zhihua;GAO Lan

机构地区：[1]武汉理工大学船海与能源动力工程学院,湖北武汉430063

出　　处：《中国修船》2022年第6期48-52,共5页China Shiprepair

摘　　要：为解决船舶电网电压不平衡和含有谐波的条件下锁相不准确问题,考虑到广泛使用的解耦双同步坐标系锁相环(DDSRF-PLL)和二阶广义积分器(SOGI)的滤波功能,文章设计一种基于改进型双二阶广义积分器滤波的解耦双同步坐标系锁相环。在Matlab/Simulink仿真平台上,分别在电网电压单相跌落20%且含有20%的5次谐波的情况下,对传统DDSRF-PLL和改进型DDSRF-PLL进行仿真试验。试验结果表明:采用改进型DDSRF-PLL,能够滤除电网电压中的特定次谐波,提高DDSRF-PLL稳定性,实现精确锁相功能,并准确分离出在dq坐标系下的电网电压正、负序分量。A decoupled double synchronous reference frame phase-locked loop(DDSRF-PLL)based on improved dual second-order generalized integrator(SOGI)filtering is designed in this paper considering the filtering function of widely used DDSRF-PLL and SOGI.It is developed to solve the problem of inaccurate phase locking under the unbalanced grid voltage of ships and harmonics.The traditional DDSRF-PLL and improved DDSRF-PLL are tested by simulations on MATLAB/Simulink.They are under a single-phase grid voltage drop of 20%and 20%of fifth harmonics separately.The test results indicate that the improved DDSRF-PLL can filter out specific harmonics in the grid voltage and promote the stability of DDSRF-PLL.It can achieve accurate phase locking and accurately separate the positive and negative sequence components of grid voltage in the dq coordinate system.

关 键 词：不平衡电网 解耦双同步坐标系锁相环 二阶广义积分器 谐波滤除 

分 类 号：U672[交通运输工程—船舶及航道工程]