Abstract
Three level neutral-point-clamped (3L-NPC) converter is a multilevel topology that is well-suited solution in high voltage, high frequency applications such as flexible AC transmission systems and electric vehicle drive systems. This paper is focused on a silicon carbon (SiC) based 3L-NPC for high frequency application which presents a higher switching loss and aging mismatch. In this paper, a new improved approach of the discontinuous pulse width modulation (DPWM) of 3L-NPC based on carrier disposition is presented. Based on the relationship between switching loss and power factor angle, an optimized DPWM method with minimum switching loss is proposed. The simulation and experimental results show how the optimized carrier disposition based discontinuous pulse-width modulation (OCD-DPWM) is achieved whereas the switching loss is reduced and the system efficiency is improved.
Highlights
As the energy crisis intensifies, there is an urgent need to improve the power electronics conversion efficiency to reduce the unnecessary waste
Differing from the SV-DPWM, carrier disposition based discontinuous pulse width modulation method is no longer relying the switch states but referring to the modulated wave which can be calculated from the reference utility voltage
There are two kind of carrier-based modulation method, one is the carrier phase shift (CPS) which is suitable for most kind of multi-level converters, the other one is the carrier disposition (CD) based modulation method which is the desired method for 3L-NPC converter
Summary
As the energy crisis intensifies, there is an urgent need to improve the power electronics conversion efficiency to reduce the unnecessary waste. Comparing to the conventional two-level converters, three level neutral-pointclamped topology which could generate three level step shaped phase voltage and five level shaped phase voltage could provide an effective way to reduce the harmonics of output voltage and current It has the advantage of the reduction of emitter-collector voltage (VCE), which means smaller voltage capacity devices could be selected for the same power application. The effectiveness of the proposed DPWM method is verified by using the simulation and the experimental results These strategies do not guarantee the minimum switching loss of the converter which operates in all the ranges of the phase angle. The switching losses for various PWM schemes are summarized From these results, an optimized DPWM strategy which is based on carrier disposition PWM is developed in order to minimize the loss of a voltage-fed three-phase PWM rectifier in all the ranges of the phase angle.
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