A comprehensive analysis of SVPWM for a Five-phase VSI based on SiC devices applied to motor drives

© 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes,creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.This paper presents a comprehensive analysis of SVPWM for a five-phase VSI based on SiC devices applied to motor drives. The modulation techniques analyzed use medium and large vectors to reach the reference vector. The 2L SVPWM uses two large space vectors, and the generated output signal contain low frequency harmonics. 2L+2M SVPWM uses two large and two medium space vectors. This technique provides good power loss distribution. 4L SVPWM works with the activation of four large space vectors. This modulation is able to generate low common-mode voltage. The performance and main features are analyzed using Matlab/Simulink and PLECS blockset software. Power losses, total harmonic distortion and common-mode voltage are compared and evaluated.Postprint (author's final draft

Multiphase PMSM and PMaSynRM flux map model with space harmonics and multiple plane cross harmonic saturation

© 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes,creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.Multiphase Synchronous Machines vary in rotor construction and winding distribution leading to non-sinusoidal inductances along the rotor periphery. Moreover, saturation and cross-saturation effects make the precise modeling a complex task. This paper proposes a general model of multi-phase magnet-excited synchronous machines considering multi-dimensional space modeling and revealing cross-harmonic saturation. The models can predict multiphase motor behavior in any transient state, including startup. They are based on flux maps obtained from static 2D Finite-Element (FE) analysis. FE validations have been performed to confirm authenticity of the dynamic models of multiphase PMaSynRMs. Very close to FE precision is guaranteed while computation time is incomparably lower.Postprint (author's final draft

A Versatile workbench simulator: Five-phase inverter and PMa-SynRM performance evaluation

© 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes,creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.Thispaperpresents the design and structure of aversatileworkbench simulator forevaluating the performance of a five-phase inverter andPermanent Magnet assisted Synchronous Reluctance Motor(PMa-SynRM). The simulatorallows for adding variations tothe modulationtechniques, changingthe inverter structure’s semiconductordevice, and calculatingtheinverter’spower losses. Itcanalso facilitate observingthe current, voltage,andthe jointtemperature ofthe semiconductors devices. Furthermore,wecanobtain a perform that is close to anactualPMa-SynRM, dependingon the desired conditionsof speed and torque. The workbench simulator wasdevelopedby combining three software: Matlab/Simulink, PLECSand Altair Flux.Postprint (author's final draft

Common-mode voltage mitigation strategies using sigma-delta modulation in five-phase VSIs

© 2022 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes,creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.Various sigma–delta ( S ¿ ) modulation techniques for reducing the maximum peak-to-peak amplitude of common-mode voltage (CMV) by 80% in a five-phase, high-frequency voltage source inverter (VSI) are proposed and evaluated in this article. These techniques are based on choosing a set of vectors that limits the CMV amplitude. Operating the VSI under high-frequency pulsewidth modulations (PWM) generates a large number of changes in the CMV levels, which leads to common-mode currents (CMCs) and conducted electromagnetic interferences (EMIs). The proposed modulation techniques achieve the following: 1) High-efficiency converter operation and output voltage with low total harmonic distortion (THD); 2) an 80% reduction in CMV peak-to-peak amplitude; 3) a decrease in the number of the CMV transitions, thus reducing the CMCs; and 4) a decrease in the conducted EMI amplitude. The use of single-loop and double-loop S ¿ modulators is analyzed by means of Matlab/Simulink and PLECS simulations. The implementation of the proposed modulation techniques has been experimentally evaluated using a five-phase VSI with silicon carbide semiconductors. In order to demonstrate the improved performance, the results obtained are compared with those of other PWM and space vector modulation techniques that also mitigate the CMV amplitude by 80% but lack the other improvements.Peer ReviewedPostprint (author's final draft

Constant common-mode voltage strategies using sigma-delta modulators in five-phase VSI

© 2022 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes,creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.This paper proposes and studies different sigma-delta () modulation strategies for obtaining a constant common-mode voltage (CMV) by eliminating the CMV level transitions in a five-phase voltage source inverter (VSI). These techniques are based on choosing vectors that generate a constant CMV with values of 0.1Vdc or 0.1Vdc. Because of the high-switching frequencies used with wide-bandgap semiconductors, pulse-width modulation (PWM) techniques continually generate high dv/dt values. Therefore, the proposal to combine a modulation strategy with vector selections achieves: 1) a constant CMV level due to the elimination of its level transitions; 2) a reduction in conducted electromagnetic interference; and 3) a high-efficiency converter operation. The average number of switching per transistor of the VSI is analyzed using the results from Matlab/Simulink and PLECS simulations. Experimental results are obtained by applying the proposed modulation strategies on a VSI with silicon carbide (SiC) MOSFETs. The results demonstrate the achievement of the aforementioned features.This work was supported in part by the Ministerio de Ciencia, Innovacion y Universidades of Spain within ´ the TRA2016-80472-R and PID2019-111420RB-I00 projects, the CONACYT of Mexico under scholarship 496458, Secre- ´ taria d’Universitats i Recerca del Departament d’Empresa i Coneixement de la Generalitat de Catalunya.Peer ReviewedPostprint (author's final draft

New modulation strategy for five-phase high-frequency VSI based on sigma–delta modulators

This article proposes a new modulation strategy for a five-phase high-frequency voltage source inverter (VSI) based on sigma–delta ( S¿ ) modulators. This modulation strategy of five-phase large–medium-zero vectors S¿ (5P-LMZV- S¿ ) applies the same switching states as the two large and two medium space vector modulation (2L+2M SVM). Because S¿ modulations are designed to operate at high switching frequencies, using wide-bandgap devices, therefore, improves the efficiency of the VSI, despite its operating at these high switching frequencies. We analyze the use of single-loop and double-loop S¿ modulators (SL-5P-LMZV- S¿ and DL-5P-LMZV- S¿ , respectively), and additionally modify the proposed modulation strategy to use all the vectors in order to analyze the effects from applying small vectors. The proposed modulation techniques allow minimizing switching losses due to the reduced switching operations, mitigating low-order harmonics, decreasing the amplitude of high-frequency harmonics, and reducing common-mode voltage dv/dt transitions. We analyze the performance of the proposed modulation technique using MATLAB/Simulink and PLECS, and then compare it with 2L+2M SVM. Using a VSI with silicon carbide mosfet , we obtained our experimental results demonstrating these characteristics, by which we conclude that our proposed strategy is an improvement over 2L+2M SVM.Postprint (author's final draft

Comparative analysis of SVM techniques for a five-phase VSI based on SiC devices

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.Postprint (published version

Vector control of crosswise saturating five-phase PMaSynRM in wide speed range

This paper deals with the realization of a five-phase cross saturating permanent magnet assisted synchronous reluctance motor (PMaSynRM) drive with vector control based on maximum torque per ampere (MTPA) and flux weakening (FW) control strategies derived from the identified flux maps originating from the finite element analysis (FEM). Tracking of the reference currents in dq1 and dq3 axes is guaranteed with the proposed approach and the voltage and current constraints are not exceeded at any working condition.Peer ReviewedPostprint (author's final draft