Abstract
This paper presents a novel switching frequency optimized space vector pulse width modulation (SVPWM) scheme for cascaded multilevel inverters. The proposed SVPWM is developed in a α′β′ coordinate system, in which the voltage vectors have only integer entries and the absolute increment of coordinate values between adjacent vectors is equal to dc-bus voltage of power cells (1 pu). The new SVPWM scheme is built with three categories of switching paths. During each switching path, the change of one phase voltage is limited in 1 pu. This contributes to decrease the number of commutations of switches. The proposed SVPWM scheme is validated on a 7-level cascaded inverter and the results show that it significantly outperforms traditional SVPWM schemes in terms of decreasing the number of switch commutations.
Highlights
Multilevel inverters have been selected as a preferred power converter topology for high voltage and high power applications [1,2]
They are widely used in medium voltage motor driver [3], high-voltage direct current (HVDC) transmission systems [4], static var generator (SVG) [5], active power filter (APF) [6] and other applications [7,8]
Coordinate system; (2) The change of one phase voltage is limited in 1 pu during each switching path; In this paper, a novel switching frequency optimized space vector pulse width modulation (SVPWM) scheme is proposed and the main
Summary
Multilevel inverters have been selected as a preferred power converter topology for high voltage and high power applications [1,2]. By carefully selecting redundant in redundancies increases and developed no generalized technique for redundancies and switching switchingpositions state transitions upper type triangle, lower type triangle and the section number, a minimum loss SVPWM scheme is developed. As the number of level increases, the selecting complexity of the “modes”redundancies need to be determined andnothegeneralized region number of theformodulation triangle should bestate calculated increases and technique redundancies and switching in the SVPWM scheme, the rule of determining theaswitching sequences is still so far. Coordinate system; (2) The change of one phase voltage is limited in 1 pu during each switching path; In this paper, a novel switching frequency optimized SVPWM scheme is proposed and the main (3) The experimental results show that the proposed method significantly outperforms the traditional contributions are summarized below: (1) the proposed SVPWM scheme is developed in a α′β′.
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