Single-Phase Seven-Level Grid-Connected Inverter for Photovoltaic System

Author

Rahim, N.A. ; Chaniago, K. ; Selvaraj, Jeyraj

Author_Institution

Center of Res. for Power Electron., Drives, Autom. & Control (UMPEDAC), Univ. Malaya, Kuala Lumpur, Malaysia

Volume

58

Issue

6

fYear

2011

fDate

6/1/2011 12:00:00 AM

Firstpage

2435

Lastpage

2443

Abstract

This paper proposes a single-phase seven-level inverter for grid-connected photovoltaic systems, with a novel pulsewidth-modulated (PWM) control scheme. Three reference signals that are identical to each other with an offset that is equivalent to the amplitude of the triangular carrier signal were used to generate the PWM signals. The inverter is capable of producing seven levels of output-voltage levels (V_dc, 2V_dc/3, V_dc/3, 0, -V_dc, -2V_dc/3, -V_dc/3) from the dc supply voltage. A digital proportional-integral current-control algorithm was implemented in a TMS320F2812 DSP to keep the current injected into the grid sinusoidal. The proposed system was verified through simulation and implemented in a prototype.

Keywords

PWM invertors; electric current control; photovoltaic power systems; power generation control; power grids; three-term control; PWM signals; TMS320F2812 DSP; digital proportional-integral current-control algorithm; grid sinusoidal; grid-connected photovoltaic systems; pulsewidth-modulated control scheme; single-phase seven-level grid-connected inverter; triangular carrier signal; Inverters; Joining processes; Pulse width modulation; Switches; Voltage control; Grid connected; modulation index; multilevel inverter; photovoltaic (PV) system; pulsewidth-modulated (PWM); total harmonic distortion (THD);

fLanguage

English

Journal_Title

Industrial Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0278-0046

Type

jour

DOI

10.1109/TIE.2010.2064278

Filename

5559471