两级式三相LCL光伏并网逆变器控制策略研究  

Research on Control Strategy of Double-stage Three-phase LCL PV Grid-connected Inverter

作　　者：楚冰清 王侃 CHU Bingqing;WANG Kan(College of Electronic Information and Electrical Engineering,Shangluo University,Shangluo 726000,China)

机构地区：[1]商洛学院,电子信息与电气工程学院,陕西商洛726000

出　　处：《微型电脑应用》2024年第12期72-75,105,共5页Microcomputer Applications

基　　金：商洛市科学技术研究发展计划项目(2020-Z-0090);商洛学院科学与技术研究项目(19SKY005)。

摘　　要：LCL滤波器谐振尖峰会严重威胁光伏并网系统的安全稳定运行,以两级式三相LCL光伏并网逆变器为研究对象,采用有源阻尼法抑制LCL滤波器的谐振尖峰。光伏阵列最大功率点跟踪控制通过调整前级Boost电路的占空比实现,后级直流交流(DC-AC)逆变器的电压外环控制用于稳定直流侧电压,电流内环采用双电流环控制,其中,并网电流外环采用比例谐振(PR)控制,实现单位功率因数并网,电容电流内环用于增加系统阻尼、抑制谐振尖峰;在MATLAB/Simulink中搭建系统的仿真模型,通过对仿真结果进行分析证明所采用的控制策略的有效性。The resonant peak of LCL filter seriously endangers the stability of PV grid-connected system.To overcome the problem,the double-stage three-phase LCL-type PV grid-connected inverter is researched,and active damping method is used to suppress the resonant peak.The maximum power point tracking control of the PV array is realized by controlling the duty of the pre-stage Boost circuit.The voltage outer loop control of back-stage direct current to alternating current(DC-AC)inverter is used to stabilize the DC side voltage.And the current inner loop control uses double current loop control.In order to realize unit power factor grid-connected control,the proportional resonant(PR)control is used in the grid-connected current outer loop control,and the capacitor current inner loop is applied to increase system damping and realize the resonant peak suppression.A simulation model of the system is built in MATLAB/Simulink,and the effectiveness of the control strategy is proved by analyzing the simulation results.

关 键 词：LCL滤波器 两级式三相光伏并网 逆变器 双电流环控制 

分 类 号：TM615[电气工程—电力系统及自动化]