Modeling and analysis of current harmonic distortion from grid connected PV inverters under different operating conditions

被引：65

作者：

Du, Yang ^{[1
]}

Lu, Dylan Dah-Chuan ^{[1
]}

James, Geoffrey ^{[2
]}

Cornforth, David J. ^{[3
]}

机构：

[1] Univ Sydney, Sch Elect & Informat Engn, Sydney, NSW 2006, Australia

[2] CSIRO, Div Energy Technol, Sydney, NSW, Australia

[3] Univ Newcastle, Sch Design Commun & IT, Callaghan, NSW 2308, Australia

来源：

SOLAR ENERGY | 2013年 / 94卷

关键词：

DC-link voltage ripple; Harmonics; Matlab/Simulink; Microgrid; PV inverter; VOLTAGE; CONVERTER; SYSTEM; INPUT;

D O I：

10.1016/j.solener.2013.05.010

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

Due to the fast growth of photovoltaic (PV) installations, concerns are rising about the harmonic distortion generated from PV inverters. High current total harmonic distortion (THD) occurs when PV inverters operate under light load conditions due to low solar insolation. A general model modified from the conventional control structure diagram is introduced to analyze the harmonic formation process. Causes of the current harmonics are summarized and its relationship with output power levels is analyzed. The field measurement for current harmonics is carried out at the Commonwealth Scientific and Industrial Research Organisation (CSIRO) microgrid to validate the analysis results. In particular for two-stage inverter, unlike previous papers that assume the DC-link voltage is constant, the DC-link voltage ripple is identified as the source of a series of odd harmonics. A mew periodic time-varying model is proposed by including the DC-link voltage ripple into the conventional current control loop model. This model is able to simulate the characteristics of the harmonic components and show their dependence on the DC-link voltage ripple. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：182 / 194

页数：13

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