An improved DPWM method for reduction of resonant problem in the inverter

Author

Jin-Hyuk Park ; Hae-Gwang Jeong ; Kyo-Beum Lee

Author_Institution

Dept. of Electr. & Comput. Eng., Ajou Univ., Suwon, South Korea

fYear

2014

fDate

14-18 Sept. 2014

Firstpage

1528

Lastpage

1533

Abstract

This paper proposes an improved discontinuous PWM (DPWM) algorithm. The modulation signal of the conventional DPWM changes discontinuously and has many harmonic components. If these harmonics components and the resonant frequency band by a grid-connected LCL-filter are overlapped, the grid current oscillates. To solve this problem, the proposed method uses the 6-th harmonic injection technique to the modulation signal. As the proposed method is used, the modulation signal changes smoothly and the harmonic components is sufficiently reduced. The proposed DPWM method is verified from the PSIM simulation with a 10 kW photovoltaic (PV) power conditioning system (PCS).

Keywords

PWM invertors; photovoltaic power systems; power harmonic filters; DPWM algorithm; PCS; PSIM simulation; PV power conditioning system; grid-connected LCL-filter; harmonic components; harmonic injection technique; improved DPWM method; improved discontinuous PWM algorithm; modulation signal; photovoltaic power conditioning system; resonant problem reduction; Harmonic analysis; Inverters; Power harmonic filters; Pulse width modulation; Resonant frequency; Switches;

fLanguage

English

Publisher

ieee

Conference_Titel

Energy Conversion Congress and Exposition (ECCE), 2014 IEEE

Conference_Location

Pittsburgh, PA

Type

conf

DOI

10.1109/ECCE.2014.6953600

Filename

6953600