Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7113061 | Electric Power Systems Research | 2014 | 13 Pages |
Abstract
The DC capacitor is an important component in a voltage source inverter. The RMS current flowing through the capacitor determines the capacitor size and losses. The losses, in turn, influence the capacitor life. This paper proposes a space vector based modulation strategy for reducing the capacitor RMS current in a three-level diode-clamped inverter. An analytical closed-form expression is derived for the DC capacitor RMS current with the proposed PWM strategy. The analytical expression is validated through simulations and also experimentally. Theoretical and experimental results are presented, comparing the proposed strategy with conventional space vector PWM (CSVPWM). It is shown that the proposed strategy reduces the capacitor RMS current significantly at high modulation indices and high power factors.
Related Topics
Physical Sciences and Engineering
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Energy Engineering and Power Technology
Authors
K.S. Gopalakrishnan, G. Narayanan,