Space vector based modulation scheme for reducing capacitor RMS current in three-level diode-clamped inverter

Gopalakrishnan, KS and Narayanan, G (2014) Space vector based modulation scheme for reducing capacitor RMS current in three-level diode-clamped inverter. In: ELECTRIC POWER SYSTEMS RESEARCH, 117 . pp. 1-13.

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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. (C) 2014 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	ELECTRIC POWER SYSTEMS RESEARCH
Publisher:	ELSEVIER SCIENCE SA
Additional Information:	Copy right for this article belongs to the ELSEVIER SCIENCE SA, PO BOX 564, 1001 LAUSANNE, SWITZERLAND
Keywords:	Capacitor RMS current; Multi-level inverter; Non-three nearest vector PWM; Neutral-point clamped inverter; Pulse width modulation; Space vector modulation
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	04 Dec 2014 04:50
Last Modified:	04 Dec 2014 04:50
URI:	http://eprints.iisc.ac.in/id/eprint/50380

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