基于DDSRF-PLL的改进型电网同步技术

A Study on the Improved Grid Synchronization Technology Based on DDSRF-PLL

本文在两相坐标系下建立了不平衡状态的三相电压矢量模型,分析了传统单同步锁相环的工作原理及其优缺点,介绍了一种后置滤波器的双同步坐标系解耦锁相环。首先定量地分析了电网电压由于扰动而引起的电压不平衡,给出电压在不平衡状态下的表达式,基于双同步坐标系分析了电压矢量,建立模型,搭建同步控制框图,并在Matlab/Simulink平台搭建模型进行仿真验证,且对该后置滤波器的DDSRF-PLL进行验证及结果分析。

This paper expounds the establishment of the unbalanced three-phase voltage vector model in the two-phase coordinate system,analyzes the working principle of the traditional single synchronous phase-locked loop as well as its advantages and disadvantages,and introduces the phase-locked loop of the post filter with the decoupling of the dual synchronous coordinate system.The voltage unbalance caused by the disturbance of the power grid voltage is firstly analyzed quantitatively and the expression of the voltage under the unbalanced state is given.The voltage vector is analyzed based on the dual synchronous coordinate system,then the model is established and the synchronous control block diagram is built.The model is built on the MATLAB/Simulink platform for simulation verification.The verification and result analysis of the DDSRF-PLL of the post filter are implemented.