In this paper, a single-phase to three-phase converter is proposed to provide variable output voltage and frequency. The proposed topology employs only six IGBT switches, which form the front-end rectifier and the output inverter for the one step conversion from single-phase supply to output three-phase supply. The front-end rectifier permits bidirectional power flow and provides excellent regulation against fluctuations in source voltage. Moreover, it incorporates active input current shaping feature. An easy method to implement control strategy is proposed. This control strategy ensures nearly unity input power factor with sinusoidal input current over the operating range. Based on sensorless vector control technique, the proposed converter is used for the speed control of the three-phase induction motor. A low cost motor drive can be achieved using the proposed converter and control technique. Simulation and experimental results are carried out to analyse and explore the characteristics of the low cost drive system.
[1]. Jin-Su Jang , Byoung-Gun Park, Tae-Sung Kim, Dong-Myung Lee, Dong-Seok Hyun: Sensorless Control of Four-Switch Three-Phase PMSM Drive Using Extended Kalman Filter. IEEE, June, 2008, 1368–1372.
[2]. M.N. Uddin , T.S. Radwana and M.A. Rahman: Performance analysis of a 4-switch, 3-phase inverter based cost effective IM motor drives/Electrical and Computer Engineering, 2004. Canadian Conference on, pp. 85–88.
[3]. C.B. Jacobina , E.R.C. da Silva, A.M.N. Lima and R.L.A. Ribeiro: Vector and scalar control of a four switch three phase inverter. In: Conf. Rec., IEEE-IAS Annu. Meeting, 1995, pp. 2422–2429.
[4]. C.B. Jacobina M.B. de Rossiter Correa E.R.C. da Silva A.M.N. Lima 2006 A General PWM Strategy for Four-Switch Three-Phase Inverters IEEE Trans. Energy Conversion 21 4 832–838.
[5]. J. Klima 2006 Analytical Investigation of an Induction Motor Fed From Four-Switch VSI with a New Space Vector Modulation Strategy IEEE Trans. Power Electron. 21 6 1618–1617.
[6]. R.J. Cruise and C.F. Landy: Phase converter for rural applications. Symposium on Power Electronics, Industrial Drives, Power Quality and Traction systems, Capri, Italy, June 1996.
[7]. J.T. Boys and A.W. Green: Current forced single-phase reversible rectifier. IEE Proceeding, Vol. 136, Pt. B. no. 5, September 1989.
[8]. N.K. Mohanty R. Muthu 2010 Microcontroller Based PWM Controlled Four Switch Three Phase Inverter Fed Induction Motor Drive Serbian Journal of Electrical Engineering 7 2 195–204.
[9]. C.-W. Park W.-H. Kwon 2004 Simple and robust speed sensorless vector control of induction motor using stator current based MRAC Electric Power Systems Research 71 257–266.
[10]. DSP — Hardware, dSPACE digital signal processing and control engineering GmbH. Germany, 1993.