Control strategy of dual fed open-end winding PMSM drive with floating bridge capacitor

This paper proposes a control strategy of open winding permanent magnet synchronous motor (OW PMSM) in field weakening modes. There are two inverters. One of them connected to the traction battery.
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Control strategy of dual fed open-end winding PMSM drive with floating bridge capacitorInternational Journal of Mechanical Engineering and Technology (IJMET)Volume 10, Issue 03, March 2019, pp. 1475–1482, Article ID: IJMET_10_03_149Available online at http://www.iaeme.com/ijmet/issues.asp?JType=IJMET&VType=10&IType=3ISSN Print: 0976-6340 and ISSN Online: 0976-6359© IAEME Publication Scopus Indexed CONTROL STRATEGY OF DUAL FED OPEN-END WINDING PMSM DRIVE WITH FLOATING BRIDGE CAPACITOR A.S. Lutonin, A.Y. Shklyarskiy, Y.E. Shklyarskiy Chair of General Electrotechnic, Saint-Petersburg Mining University, St. Petersburg, Russia ABSTRACT This paper proposes a control strategy of open winding permanent magnet synchronous motor (OW PMSM) in field weakening modes. There are two inverters. One of them connected to the traction battery. Main bridge inverter aimed to provide power with approximately unity power factor, another one to capacitor. Floating bridge inverter aimed to control capacitor voltage on desired value and provide reactive power to the moto. Compare OW PMSM control system with conventional field-oriented control (FOC) shows that proposed method helps to reach speed 1.41 times more than FOC system. FOC system was simulated with 310V DC power supply. OW PMSM with 160V DC power supply and 500 nanofarad capacitor. Key words: OWPMSM, OEWPMSM, SVPWM, Floating bridge, Permanent, magnet, motor, MATLAB, capacitor Cite this Article: A.S. Lutonin, A.Y. Shklyarskiy, Y.E. Shklyarskiy, Control Strategy of Dual Fed Open-End Winding PMSM Drive with Floating Bridge Capacitor, International Journal of Mechanical Engineering and Technology 10(3), 2019, pp. 1475–1482. http://www.iaeme.com/IJMET/issues.asp?JType=IJMET&VType=10&IType=31. INTRODUCTIONPMSM motor is widely used in traction applications because of its best mass/dimensional ratioparameters, high efficiency [1,2]. However, one of the main PMSM motors’ problem is rapidtorque decreasing while working in high-speed area. In [3-5] paper, special control algorithmsto control PMSM motor in field weakening mode were proposed. In [6] L.Chu, et al comparedmaximum speed dependency on stator winding connection type. Trends showed maximumspeed increasing ability with open winding connection mode with flux weakening controlalgorithms. In paper [7] OW-PMSM with five leg inverters with five leg secondary inverterwere presented. In [8] comparing different topologies of OWPMSM motor were presented.Topologies with single power source and with two different power sources with equal voltagesis the most acceptable for flux weakening operation. Paper [9] presents topology of OWPMSMmotor with two inverters with independent power sources, where algorithms of power sharingbetween independent sources were presented. Paper [10] describes algorithms of OWPMSMcontrol with electrolytic capacitor connection on the secondary inverter’s power side. Research http://www.iaeme.com/IJMET/index.asp 1475 editor@iaeme.com Control Strategy of Dual Fed Open-End Winding PMSM Drive with Floating Bridge Capacitorresults shows that capacitor helps to reduce back-EMF of PMSM motor and increase itsmaximum operation speed value. This paper represents OWPMSM topology two inverters with DC-source inone side and floating capacitor on the other side coupled to powertrain in order to getpresented topology’s dynamic performance.2. OWPMSM MOTOR MODEL Figure 1. OWPMSM motor equivalent circuit Equivalent circuit of OWPMSM showed on Fig.1. Generally, there is no difference withPMSM with stator star secondary winding connection. PMSM motor equations are given by: Vq   Rs  Lq  r Ld  iq   r  f  V      L   Rs  Ld  id    f   d  r q (1) where V d – d-axis voltage; Vq – q-axis voltage; R s – stator resistance; Ld – d-axis self-inductance; Lq – q-axis self-inductance;  r – electrical speed;  f – PM flux linkage or Fieldflux linkage;  – derivative operator; id – d-axis current; i q – q-axis current. Motor torque can be calculated as Te  3P     d iq   q id 2 2   (2) where Te – develop torque; P – pole number  d –d axis flux linkage;  q – q axis fluxlinkage; Mechanical torque equation is: d m Te  TL  B m  J (3) dt where T L – load torque; B – friction coefficient  m –mech ...