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A performance comparison study between lower switching loss-based space-vector pulsewidth modulation (PWM) strategy for a three-level neutral-point-clamped inverter and a proposed modified-carrier-based PWM strategy is carried out for an electric vehicle propulsion application. The proposed carrier-based strategy uses single carrier and reduces the switching losses compared with the conventional carrier-based...
Instead of constant dc-link voltage, this paper proposes a PAM/PWM for PMSM drive, which provides variable dc-link voltage to PWM inverter to reduce switching loss and improve system efficiency. An optimal dc-link voltage reference can be found for a specified operation speed for a centrifugal load condition. In order to realize the variable dc-link voltage, this paper implements a variable output...
This paper presents a performance comparison study between the proposed continuous- and discontinuous-hybrid-PWM (C-HPWM, D-HPWM) based techniques used for neutral point clamped (NPC) 3-level inverter. The H-PWM strategy uses both the advantages of carrier and space vector based PWM strategies. The duty cycles are generated using the carrier based strategy to reduce the computational complexity of...
A motor drive with a PFC front-end converter provides advantages of improved power quality and over-all system efficiency. A buck-boost PFC converter provides adjustable output dc-link voltage for switching loss reduction of the connected PWM inverter drive. This paper proposes a green mode control strategy for the variable output voltage power factor correction (VOPFC) ac-dc converter and connected...
It is well-known that ultra-low-power three-phase elements, such as ultra-small-size permanent-magnet brushless motor drivers, have been widely used in the consumer products. In order to reduce the cost, size and power consumption of products, it is necessary to integrate the system functions with square-wave PWM (SWPWM) driver in the system-on-chip (SOC) implementation. It follows that, the driver...
Nowadays there is an increasing attention towards multiphase drives, especially for medium and high power applications. In this paper some modulation strategies for M-phase inverters are compared and the modulation strategy with the minimum switching losses is determined. If the switching devices of the inverter are IGBTs or BJTs, this modulation strategy turns out to be the one with the minimum total...
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