电力系统自动化2018，Vol.42Issue(9)：114-119,6.DOI:10.7500/AEPS20170628005
具有低次谐波抑制功能的虚拟电阻型光伏逆变器
Virtual-resistance-type Photovoltaic Inverter with Low-order Harmonics Suppression
凌毓畅 1曾江 1刘洋 1杨林1
作者信息
- 1. 华南理工大学电力学院,广东省广州市510640
- 折叠
摘要
Abstract
Aimed at the problem that the photovoltaic inverter with harmonic compensation can only compensate the harmonics from local non-linear load and cannot participate in the harmonic control of the power grid and it is difficult to measure the contribution of the harmonic control,this paper proposes a new virtual-resistance-type photovoltaic inverter,which can suppress the low-order harmonic voltages at point of common coupling(PCC).The suppressing impact of resistance on PCC harmonic voltages and power system resonance is analyzed.Based on it,the control method of virtual-resistance-type photovoltaic inverter is proposed.PI controllers are used to obtain the harmonic voltages and corresponding harmonic currents got by fast Fourier transformation on PCC voltages and grid-connected currents are in the same phase and differed by Khin amplitudes,which makes photovoltaic inverter equal to a"virtual resistance".Absorbed harmonic power is selected to measure the contributions to harmonic control,and Khis adjusted automatically in the criteria of absorbed harmonic power maximization.The simulation and experiment results show that the proposed virtual-resistance-type inverter can be used for power generation,suppressing low-order harmonic voltages at PCC.关键词
谐波抑制/光伏逆变器/LCL滤波器/谐波功率/虚拟电阻Key words
harmonic suppression/photovoltaic inverter/LCL filter/harmonic power/virtual resistance引用本文复制引用
凌毓畅,曾江,刘洋,杨林..具有低次谐波抑制功能的虚拟电阻型光伏逆变器[J].电力系统自动化,2018,42(9):114-119,6.
