电网随机扰动下的光伏微网逆变器建模及控制研究  

Research on Modeling and Control of Photovoltaic Microgrid Inverter under Random Disturbance of Power Grid

作　　者：项琴琴 廖志贤[1] 李廷会[1] 蒋品群[1] 黄国现[1] XIANG Qinqin;LIAO Zhixian;LI Tinghui;JIANG Pinqun;HUANG Guoxian(College of Electronic Engineering,Guangxi Normal University,Guilin Guangxi 541004,China)

机构地区：[1]广西师范大学电子工程学院

出　　处：《广西师范大学学报（自然科学版）》2020年第1期19-25,共7页Journal of Guangxi Normal University:Natural Science Edition

基　　金：国家自然科学基金(11562004);广西自然科学基金(2018GXNSFAA138014);桂林市科学研究与技术开发计划项目(20170113-4)

摘　　要：本文为了研究光伏微网逆变器系统在施加随机扰动时的控制方法及性能,在光伏微网逆变器系统的公共连接点信号上施加随机扰动,并考虑随机扰动情况下进行建模,采用引入积分补偿的预测控制方法,既可预测系统未来的输出状态,也能消除静态误差,有效地抑制逆变器输出的电流、电压失真现象,保持系统的稳定性。基于MATLAB的Simulink平台搭建了逆变器系统仿真模型,仿真结果得到逆变器输出的电流、电压的总谐波失真度(THD)分别为0.57%、2.57%,满足国家电网对总谐波失真度(THD≤5%)的标准,并且保证了输出波形的稳定。研究表明:这种改进后的控制方法可使在有随机扰动情况下的单相光伏微网逆变器系统保持稳定,对光伏微网的理论和应用研究具有一定的参考价值。In order to study the control method and performance of the PV microgrid inverter system when applying random disturbance, random disturbance is applied to the common connection point signal of the PV microgrid inverter system, and modeling is carried out in consideration of random disturbance. The predictive control method of integral compensation can not only predict the future output state of the system, but also eliminate the static error, effectively suppress the current and voltage distortion phenomenon of the inverter output, and maintain the stability of the system.The simulation model of the inverter system was built by using Simulink platform of MATLAB.The simulation results showed that the total harmonic distortion(THD) of the current and voltage output by the inverter is 0.57% and 2.57%, respectively, which meets the national grid’s standard for total harmonic distortion(THD ≤5%) and guarantees the stability of the output waveform.The research shows that this improved control method keeps the single-phase PV microgrid inverter system stable under random disturbances,which has certain reference value for the theory and application research of photovoltaic microgrid.

关 键 词：光伏 光伏微网逆变器 随机扰动 预测控制 积分补偿 

分 类 号：TM74[电气工程—电力系统及自动化]