电工技术学报2018，Vol.33Issue(5)：1040-1050,11.DOI:10.19595/j.cnki.1000-6753.tces.170093
一种基于虚拟同步发电机的电流谐波抑制方法
A Method of Current Harmonics Suppression Based on VSG
耿乙文 1田芳芳 1孙帅 1魏晨曦 1张洋1
作者信息
- 1. 中国矿业大学电气与动力工程学院 徐州 221008
- 折叠
摘要
Abstract
Virtual synchronous generator (VSG) can make distributed generation connect to power grid friendly. However, in actual operation, there are some low-order harmonics in grid voltage, which will generate the same order harmonics in grid-connected current and worsen the power quality. As for the problem, current harmonics are suppressed by remodeling the admittance at the harmonic frequencies in this paper. Firstly, admittance model of VSG is established. Then the reason that grid voltage harmonics can affect grid-connected current is analyzed. Secondly, according to admittance model, a grid voltage feedforward strategy is proposed based on notch filter, which can suppress current harmonics by remodeling the admittance at the harmonic frequencies. the transfer function of the grid voltage feedforward is obtained. A feedforward partly strategy at the harmonic frequencies is adopted in order to solve the problem that the transfer function of grid voltage feedforward contains differential terms and has a high gain in the base frequency which will cause over modulation. Finally simulation results and experimental results verify the correctness and effectiveness of the proposed strategy.关键词
虚拟同步发电机/电流谐波抑制/导纳重塑/陷波器Key words
Virtual synchronous generator/current harmonics suppression/admittance remodeling/notch filter分类
信息技术与安全科学引用本文复制引用
耿乙文,田芳芳,孙帅,魏晨曦,张洋..一种基于虚拟同步发电机的电流谐波抑制方法[J].电工技术学报,2018,33(5):1040-1050,11.
