Analytical method to calculate the DC link current stress in voltage source converters

Author

Gohil, Ghanshyamsinh ; Bede, Lorand ; Teodorescu, Remus ; Kerekes, Tamas ; Blaabjerg, Frede

Author_Institution

Dept. of Energy Technol., Aalborg Univ., Aalborg, Denmark

fYear

2014

fDate

16-19 Dec. 2014

Firstpage

1

Lastpage

6

Abstract

The dc-link capacitor is one of the critical components, which influences the lifetime of the whole voltage source converter unit. For reliable design, the operating temperature of the dc-link capacitor should be known, which is primarily determined by the ambient temperature and the rms value of the current flowing through the dc-link capacitor. A simple analytical method to calculate the rms value of the dc-link capacitor current is presented in this paper. The effect of the line current ripple on the rms value of the dc-link capacitor current is considered. This yields accurate results, especially for the applications with high line current ripple. The effect of the pulsewidth modulation (PWM) scheme on the rms value of the dc-link current is also studied and the analysis for continuous PWM and discontinuous PWM (DPWM) schemes is presented. The proposed analytical method is also verified experimentally.

Keywords

DC-AC power convertors; PWM power convertors; power capacitors; DC link capacitor current stress calculation analytical method; DC-AC converter; DPWM scheme; ambient temperature; continuous PWM scheme; discontinuous PWM scheme; high line current ripple; pulsewidth modulation scheme; rms value; voltage source converter; Capacitors; Pulse width modulation; Reactive power; Support vector machines; Switches; Vectors;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics, Drives and Energy Systems (PEDES), 2014 IEEE International Conference on

Conference_Location

Mumbai

Print_ISBN

978-1-4799-6372-0

Type

conf

DOI

10.1109/PEDES.2014.7041953

Filename

7041953