A Novel Control Strategy of Suppressing DC Current Injection to the Grid for Single-Phase PV Inverter

Author

Guofeng He ; Dehong Xu ; Min Chen

Author_Institution

Inst. of Power Electron., Zhejiang Univ., Hangzhou, China

Volume

30

Issue

3

fYear

2015

fDate

Mar-15

Firstpage

1266

Lastpage

1274

Abstract

Photovoltaic (PV) inverters without the isolation transformer become more attractive due to higher efficiency and lower weight. However, it may have dc offset current problem and is critical to the power system. In this paper, a novel control strategy of suppressing dc current injection to the grid for PV inverters is investigated. It is based on the idea of accurately sensing the dc offset voltage of PV inverter output. Since dc component of the inverter output can be eliminated, dc injection to the grid can be effectively suppressed. Finally, the control scheme is verified by the experiment.

Keywords

electric current control; invertors; photovoltaic power systems; power grids; DC current injection suppression; DC offset current problem; DC offset voltage sensing; PV inverter; photovoltaic inverter; power grid; power system; Capacitors; Differential amplifiers; Inverters; Sensors; Standards; Switches; Voltage control; DC current injection; dc offset voltage; dc suppression loop; grid; photovoltaic (PV) inverter;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/TPEL.2014.2317288

Filename

6797975