Research on LLCL Filtering Grid - Connected inverter under the Control of PFI

2017 International Symposium on Application of Materials Science and Energy Materials

材料科学;能源学

Li, Ren-Qing^1 ; Zong, Ke-Yong^1 ; Wang, Yan-Ping^1 ; Li, Yang^1 ; Zhang, Jing^1

School of Information Science and Engineering, Dalian Polytechnic University, Dalian

116034, China^1

关键词: Grid connected inverters;    Harmonic contents;    Linear superpositions;    Proportional feedback;    Proportional-integral control;    Renewable energy generation;    Steady state errors;    Topological graphs;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/322/7/072036/pdf
DOI  :  10.1088/1757-899X/322/7/072036

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

This passage puts forward a kind of LLCL inverter which is based on the proportional feedback integral(PFI) control so as so satisfy the request of the grid-current outputed by the renewable energy generation system. The passage builds the topological graph of grid-connected inverter and makes an analysis of principle of linear superposition aims to reveal the essence of the problem of steady-state error that exists in proportional integral control. We use LLCL filter and the method of passive damping to solve the problem of resonant peak. We make simulation of the grid system with the software named MATLAB/Simulink. The result shows that the grid current enters steady state quickly and in the same time, which has the identical phase and frequency of grid-voltage. The harmonic content in grid current satisfies the request of grid standard.