基于电网电压全前馈的电网背景谐波抑制研究  

Research on Power Grid Background Harmonic Suppression Based on Grid Voltage Full-feedforward

作　　者：柴秀慧[1] 张纯江[1] 赵晓君[1] 孙菲 CHAI Xiu-hui;ZHANG Chun-jiang;ZHAO Xiao-jun;SUN Fei(Yanshan University,Qinhuangdao 066004,China)

机构地区：[1]燕山大学,电气工程学院,河北省电力电子与电力传动重点实验室,河北秦皇岛066004

出　　处：《电力电子技术》2020年第8期5-7,18,共4页Power Electronics

基　　金：河北省自然科学基金(E2018203152);河北省博士后科研项目择优资助(B2019003024)。

摘　　要：弱电网的特征之一是严重的背景谐波,导致并网电流出现明显的畸变。以LCL型并网逆变器为研究对象,提出一种电网电压全前馈控制,可以有效抑制电网电压背景谐波对并网电流的影响从而提高并网电能质量。首先,分析电网电压对并网电流的影响机理,从而在电流控制环路中引入一个正的电网电压反馈来抵消电网电压对并网电流的影响。通过控制框图等效变换,推导出消除背景谐波影响所需的电网电压全前馈函数。其次,通过全前馈函数的深入分析,得出根据电网电压含有谐波频次的不同,对全前馈函数进行优化设计的方法。在保证前馈控制效果的同时,简化控制算法。最后,通过实验验证了所提控制策略的有效性和可行性。One of the characteristics of weak grid is the severe backgroud harmonics,which lead to obvious distortion of grid-connected current.LCL grid-connected inverter as research object is taken,and a grid voltage full-feedforward control is proposed,which can effiectively supprss the influence of the groudback harmonics of the grid voltage on the grid-connected current to improve the grid-connected power quality.Firstly,the influence mechanism of the grid voltage on grid-connected curent is analyzed,a positive grid voltage feedback is introduced in the current control loop to offset the influent of grid-connected voltage on grid-connected current.The full-feedforward function of grid voltage required to eliminate the backgroud harmonic is derived through the equivalent transformation of control block diagram.Secondly,through the deep analysis of the full-feedforward function,the optimiztion design method of the full-feedforward function is obtained according to the different harmonic frequencies of the grid voltage.Finally,the effectiveness and feasibility of the proposed control stratagy are verified by the experiment.

关 键 词：电网 电网电压全前馈 电网背景谐波 

分 类 号：V242.31[航空宇航科学与技术—飞行器设计]