Abstract
Multiphase systems provides benefits compared to three-phase systems, such as improved torque per ampere, high power density, better fault tolerance, lower current per phase (due to power-splitting among a higher number of phases), and lower torque ripple, among others. Depending on the application, the system must meet determined requirements, such as the presence of harmonic content, power losses, and common-mode voltage (CMV) generation. This paper presents a comparative analysis of space vector modulation (SVM) techniques applied to a five-phase voltage source inverter with SiC switches to provide an overview of their performance. The performance of five-phase 2L SVPWM (space vector pulse width modulation), 2L+2M SVPWM, 4L SVPWM techniques, and their discontinuous versions, are analyzed by focusing on harmonic content, power losses, and CMV generation using SiC semiconductor devices. Matlab/Simulink and PLECS simulations are performed to achieve the above mentioned goal. The use of different techniques allows (1) reducing the harmonic distortion when 2L+2M SVPWM and 4L SVPWM are applied, and (2) the switching sequence of the modulation techniques can influence the switching losses. Therefore, the use of SiC switches reduces the switching losses. (3) However, CMV dv/dt increases. Therefore, it is possible to minimize the effects of the CMV dv/dt and amplitude by choosing the adequate technique.
Highlights
Multiphase machines were first introduced in the 1960s, but it was not until the early 2000s that researchers began to pay attention to them [1,2]
This paper focuses on the space vector modulation (SVM) techniques applied to five-phase inverters using silicon carbide (SiC) switches
If the objective is for the harmonic content to be low in the output voltages and currents, the best options are 2L+2M space vector pulse width modulation (SVPWM), 4L SVPWM and their discontinuous versions
Summary
Multiphase machines were first introduced in the 1960s, but it was not until the early 2000s that researchers began to pay attention to them [1,2]. Some of the advantages of multiphase over three-phase machines are improved fault tolerance [17,18,19], improved torque per ampere, lower current per phase, higher reliability, more degrees of freedom, and a reduction in the amplitude of the torque pulsations when increasing their frequency [20]. These advantages make multiphase machines a better option for applications such as electric traction, eolic energy systems, and other high power industries. As with three-phase inverters, the modulation techniques for multiphase machines are pulse width modulation (PWM) and space vector modulation (SVM)
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