三相并网电压逆变器的无源控制策略  

Passive Control Strategy of Three-phase Grid-connected Voltage Source Inverter

作　　者：许大伟 张会林 XU Da-wei;ZHANG Hui-lin(Department of Electrical Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学机械工程学院,上海200093

出　　处：《软件导刊》2021年第7期102-106,共5页Software Guide

摘　　要：为解决以PI控制为代表的传统并网电流控制算法稳定性与抗干扰性不足,以及所有控制方法均没有考虑到控制对象能量耗散特性的问题,以LCL滤波三相并网电压逆变器(GCVSI)为研究对象,引入一种基于能量分配控制和使用系统耗能特性进行阻尼注入的无源控制策略。首先,建立三相并网电压逆变器的欧拉—拉格朗日数学模型,然后将无源控制理论引入系统控制中,利用有源阻尼抑制滤波器的谐振尖峰;然后利用MATLAB/SIMULINK实验平台建立三相并网电压逆变器与无源控制器的仿真模型,并进行仿真验证。实验结果表明,并网电流波形稳定平滑,总谐波畸变率(THD)小于5%,且无论增加或降低额定功率,系统均可在0.5ms内几乎无振荡地进入下一个稳定周期。该无源控制器不仅能满足系统稳定性要求,还具有良好的动态性能。In order to solve the problem that the traditional grid connected current control algorithm represented by PI control is lack of stability and anti-interference,and all control methods do not consider the energy dissipation characteristics of the control object,the LCL filter three-phase Grid-Connected Voltage Source Inverter(GCVSI)is taken as the research object,and a passive control strategy based on energy allocation control and damping injection by using the energy consumption characteristics of the system is introduced.Firstly,the Euler Lagrange mathematical model of the grid connected voltage source inverter is established,and then the passive control theory is introduced into the control of the system,and the active damping is used to suppress the resonance peak of the filter at the resonance frequency.The simulation model of three-phase grid connected voltage source inverter and passive controller is established by using MATLAB/SIMULINK experimental platform,and the simulation results are verified.The experimental results show that the grid connected current waveform is stable and smooth,the total harmonic distortion rate(THD)is less than 5%,and the system can enter the next stable cycle within 0.5ms adjustment time,no matter increasing or decreasing the rated power.Therefore,it is verified that the passive controller not only meets the system stability requirements,but also has good dynamic performance.

关 键 词：三相并网电压逆变器 LCL滤波器 无源控制 智能电网 

分 类 号：TP301[自动化与计算机技术—计算机系统结构]