Carrier-Based Discontinuous PWM Method for Five-Leg Inverter

Abstract

This paper proposes a rotation carrier-based discontinuous pulse width modulation (CB-DPWM) method for the five-leg inverter (FLI). The FLI based on two-level topology consists of 10 switching devices for driving dual motors. Therefore, two switching devices can be reduced to compare the configuration using two three-leg inverters for driving dual motors. The proposed pulse width modulation (PWM) method is based on the reference signals which are used in existing carrier-based continuous pulse width modulation (CB-CPWM) method for FLI. In the proposed rotation CB-DPWM method, one of fiveleg is periodically clamped to Vdc/2 or-Vdc/2 by adding the offset voltage to the reference voltages of the existing CB-CPWM method. The five reference voltages for all legs are considered to calculate the offset voltage of the proposed rotation CB-DPWM method. Consequently, since the proposed rotation CB-DPWM method has the fewer number of switching than that of the existing CB-CPWM, the switching loss can be reduced and it results in the efficiency improvement. Simulation and experimental results confirm the effectiveness and feasibility of the proposed method. INDEX TERMS Five-leg inverter (FLI), Modulation, rotation Carrier-based discontinuous pulse width modulation (CB-DPWM), Dual-motor driving system

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“…The existing modulations are the carrier-based PWM (CPWM) and space vector modulation (SVM), and both methodologies can generate the voltage vectors needed by the two connected parts. 8 Based on CPWM and conventional controllers, the FLC has been proposed for grid-connected doubly fed induction generator (DFIG). 9 This scheme has been modified for single-phase grid connection, 10 but it uses an additional rotor power converter.…”

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