Eliminating Leakage Currents in Neutral Point Clamped Inverters for Photovoltaic Systems

被引：193

作者：

Cavalcanti, Marcelo C. ^{[1
]}

Farias, Alexandre M. ^{[1
]}

Oliveira, Kleber C. ^{[1
]}

Neves, Francisco A. S. ^{[1
]}

Afonso, Joao L. ^{[2
]}

机构：

[1] Univ Fed Pernambuco, Dept Elect Engn, BR-52720001 Recife, PE, Brazil

[2] Univ Minho, Dept Ind Elect, P-4800058 Guimaraes, Portugal

来源：

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS | 2012年 / 59卷 / 01期

关键词：

Energy conversion; photovoltaic power systems; pulse width modulated power converters; MPPT PERFORMANCE; POWER;

D O I：

10.1109/TIE.2011.2138671

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

The main contribution of this paper is the proposal of new modulation techniques for three-phase transformerless neutral point clamped inverters to eliminate leakage currents in photovoltaic systems without requiring any modification on the multilevel inverter or any additional hardware. The modulation techniques are capable of reducing the leakage currents in photovoltaic systems by applying three medium vectors or using only two medium vectors and one specific zero vector to compose the reference vector. In addition, to increase the system utilization, the three-phase neutral point clamped inverter can be designed to also provide functions of active filter using the p-q theory. The proposed system provides maximum power point tracking and compensation of current harmonics and reactive power. To validate the simulation models, an experimental three-phase inverter is used to evaluate leakage currents and the dc link voltage control.

引用

页码：435 / 443

页数：9

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