Abstract
This paper presents a discontinuous space vector modulation technique for unbalanced two-phase three-leg inverters. This technique is based on the shift-angle and generalized modulation algorithm obtained for generating the unbalanced two-phase output voltage. Furthermore, the discontinuous switching sequence intends to improve the commutations of power switching devices in each inverter leg that achieves a minimum number of switching state changes in one sampling cycle. Therefore, the switch commutations can be reduced by one-third in one main period. The step- by-step procedure of the modulation algorithm for easy implementation in a digital control platform is discussed. The performance of the developed modulation technique is verified through both simulation and experimental results in a nonunity power factor balanced two-phase load and asymmetrical two-phase induction motor drive.
Highlights
In order to confront the reduced switching losses and high-performance requirements for inverters, low switching frequency operations and modified modulation techniques have intensively been studied [1,2,3,4,5]
This paper focused on the continuous space vector modulation (SVM) technique for generating the balanced two output voltages
Simulation results of the discontinuous SVM technique for the nonunity power factor balanced two-phase load This subsection presents the simulation results that the unbalanced two-phase three-leg inverter obtains using the discontinuous SVM technique
Summary
In order to confront the reduced switching losses and high-performance requirements for inverters, low switching frequency operations and modified modulation techniques have intensively been studied [1,2,3,4,5]. The discontinuous space vector modulation (SVM) techniques are more widely used for better performance of the inverter, in which each phase of the inverter is clamped to either negative or positive DC-link voltage for an interval of one-third in one main period It can reduce the switching losses compared with the continuous SVM or carrier-based pulse-width modulation (CBPWM) [6,7,8,9,10,11,12]. The expressions of the continuous SVM technique for the unbalanced two-phase three-leg inverter were presented in [16] and the switching losses and current ripple reduction based on discontinuous SVM technique were introduced in [17] This technique can reduce the output current ripple and switching losses at high modulation index operation.
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