Multiphase machines are gaining increasing popularity because of their distinct advantages over three-phase counterparts,such as reduced per phase power rating,improved reliability and increased degrees of freedom.Thi...Multiphase machines are gaining increasing popularity because of their distinct advantages over three-phase counterparts,such as reduced per phase power rating,improved reliability and increased degrees of freedom.This paper overviews the development history of multiphase machines and drive techniques in Section II.Three kinds of drive algorithms,including Field-Oriented Control(FOC),Direct Torque Control(DTC)and Model Predictive Control(MPC),are introduced in Section III.Then two types of fault-tolerant methods are compared in Section IV,which are the Vector Space Decomposition(VSD)strategy and Optimal Current Control(OCC)method.Furthermore,different types of existing multiphase converter topologies are listed in Section V,and various kinds of multiphase PWM methods are discussed in Section VI.Finally,based on the review,developing trends of multiphase drive techniques are forecasted.展开更多
In this paper,research into torque ripple production has been undertaken for both the healthy and open-circuit faulttolerant conditions of a five-phase permanent magnet(PM)machine by using the instantaneous power(I-Po...In this paper,research into torque ripple production has been undertaken for both the healthy and open-circuit faulttolerant conditions of a five-phase permanent magnet(PM)machine by using the instantaneous power(I-Power)approach.When only the fundamental component of the phase currents is applied to the phase windings,it has been shown that the 9th and 11th harmonics of the back-electromotive force(back-EMF)causes torque ripples in a five-phase PM machine and its frequency is ten times the frequency of the fundamental phase currents.When the combined fundamental and third harmonic components of the phase currents are applied to the phase windings,it has been shown that the 7th and 13th harmonic of the back-electromotive force(back-EMF)causes additional torque ripples in a five-phase PM machine.These torque ripples under fault-tolerant conditions have been analyzed analytically,as well.It has been proven that there are interactions between the fundamental component of current and the third harmonic component of the back-EMF and vice versa.These interactions cause torque ripples.A finite element analysis(FEA)model of the five-phase PM machine has been done to validate the analytical results.展开更多
The main difficulty in designing predictive controllers for permanent magnet motors with different topologies is the control of the additional current subspaces.The frequency of current components in these additional ...The main difficulty in designing predictive controllers for permanent magnet motors with different topologies is the control of the additional current subspaces.The frequency of current components in these additional subspaces(harmonic subspaces and zero-sequence loop/subspaces)is several times the fundamental current frequency.Moreover,the inner voltage source would vary with operation conditions,and there are also different views about the causes of inner voltage sources.This paper analyses the inner voltage sources in these additional current subspaces for permanent magnet motors with different drive topologies using simulation and experiment.Based on the results of the simulations and experiments,we analyze the sources and characteristics of the inner voltage sources and provide a predictive model calibration method for the components in these additional subspaces.Finally,the deadbeat current control scheme based on calibrated look-up table is designed and verified.展开更多
The analysis and simulation of power system are becoming more and more challenging as the complexity of system topology and components has been increased. In this paper, a hybrid parallel algorithm is proposed for the...The analysis and simulation of power system are becoming more and more challenging as the complexity of system topology and components has been increased. In this paper, a hybrid parallel algorithm is proposed for the real-time electromagnetic transient simulation （EMTS） of integrated power systems containing multiphase machines. The proposed algorithm is com- posed of a novel network partition method called component level parallelization and the Multi-Area Thevenin Equivalent （MATE） method, which extends the flexibility of the network partition in parallel simulation. Moreover, several methods are developed to enhance the efficiency of the communication and computation. Power systems with up to 410 single-phase elec- trical nodes and 336 switches are simulated in a time step of 50 ~ts to validate the proposed algorithm.展开更多
基金This work was supported in part by National Natural Science Foundation of China under Project 51707007in part by National Postdoctoral Program for Innovative Talents under Project BX201600012in part by China Postdoctoral Science Foundation under Project 2017M620601.
文摘Multiphase machines are gaining increasing popularity because of their distinct advantages over three-phase counterparts,such as reduced per phase power rating,improved reliability and increased degrees of freedom.This paper overviews the development history of multiphase machines and drive techniques in Section II.Three kinds of drive algorithms,including Field-Oriented Control(FOC),Direct Torque Control(DTC)and Model Predictive Control(MPC),are introduced in Section III.Then two types of fault-tolerant methods are compared in Section IV,which are the Vector Space Decomposition(VSD)strategy and Optimal Current Control(OCC)method.Furthermore,different types of existing multiphase converter topologies are listed in Section V,and various kinds of multiphase PWM methods are discussed in Section VI.Finally,based on the review,developing trends of multiphase drive techniques are forecasted.
文摘In this paper,research into torque ripple production has been undertaken for both the healthy and open-circuit faulttolerant conditions of a five-phase permanent magnet(PM)machine by using the instantaneous power(I-Power)approach.When only the fundamental component of the phase currents is applied to the phase windings,it has been shown that the 9th and 11th harmonics of the back-electromotive force(back-EMF)causes torque ripples in a five-phase PM machine and its frequency is ten times the frequency of the fundamental phase currents.When the combined fundamental and third harmonic components of the phase currents are applied to the phase windings,it has been shown that the 7th and 13th harmonic of the back-electromotive force(back-EMF)causes additional torque ripples in a five-phase PM machine.These torque ripples under fault-tolerant conditions have been analyzed analytically,as well.It has been proven that there are interactions between the fundamental component of current and the third harmonic component of the back-EMF and vice versa.These interactions cause torque ripples.A finite element analysis(FEA)model of the five-phase PM machine has been done to validate the analytical results.
基金a grant(Project No.SGDX2019081623101559)of Shenzhen–Hong Kong Innovation Circle Category C Project from the Science Technology and Innovation Committee of Shenzhen Municipality,Chinaa grant(Project No.ITP/027/19AP)from the Innovation and Technology Commission,Hong Kong SAR,China+1 种基金in part by the grants(Project No.TDG6000784,ARG9667251 and SRG7005583)from the Teaching Development Grant,Applied Research Grant and Strategy Research Grant,City University of Hong Kong,Hong Kong SAR,Chinaand in part by Collaborative Research Fund(Project No.C1052-21GF)from Research Grants Council,Hong Kong SAR,China.
文摘The main difficulty in designing predictive controllers for permanent magnet motors with different topologies is the control of the additional current subspaces.The frequency of current components in these additional subspaces(harmonic subspaces and zero-sequence loop/subspaces)is several times the fundamental current frequency.Moreover,the inner voltage source would vary with operation conditions,and there are also different views about the causes of inner voltage sources.This paper analyses the inner voltage sources in these additional current subspaces for permanent magnet motors with different drive topologies using simulation and experiment.Based on the results of the simulations and experiments,we analyze the sources and characteristics of the inner voltage sources and provide a predictive model calibration method for the components in these additional subspaces.Finally,the deadbeat current control scheme based on calibrated look-up table is designed and verified.
基金supported by the National Natural Science Foundation of China (Grant Nos. 51277104,51207076)the Postdoctoral Science Foundation of China (Grant No. 20110490351)
文摘The analysis and simulation of power system are becoming more and more challenging as the complexity of system topology and components has been increased. In this paper, a hybrid parallel algorithm is proposed for the real-time electromagnetic transient simulation （EMTS） of integrated power systems containing multiphase machines. The proposed algorithm is com- posed of a novel network partition method called component level parallelization and the Multi-Area Thevenin Equivalent （MATE） method, which extends the flexibility of the network partition in parallel simulation. Moreover, several methods are developed to enhance the efficiency of the communication and computation. Power systems with up to 410 single-phase elec- trical nodes and 336 switches are simulated in a time step of 50 ~ts to validate the proposed algorithm.
