Karim ABBASZADEH, Mahdi JAFARI, Mustafa MOHAMMADIAN

A novel DTC-SVM approach for two parallel-connected induction motors fed by matrix converter

AC machines fed by a single inverter are widely used in industries such as railroad electrification systems where speed synchronization does not have to be exact. The low cost and volume and the small number of power electronic components are attractive aspects of single-inverter multi-motor systems. This paper proposes a novel approach to controlling the speed and torque of two induction motors connected in parallel and fed by a matrix converter under unbalanced load condition. This single-inverter dual-motor (SIDM) drive uses average and differential values of speed and torque together with stator and rotor flux parameters based on the flux dead-beat scheme. An advantage of the proposed approach, compared with the conventional direct torque control (DTC) method, is that it eliminates the lookup table and lowers the torque and current ripple through the use of the PI controller instead of hysteresis blocks. Combining DTC and space vector modulation (SVM) with a matrix converter (MC) and achieving the unit input power factor are other advantages of the present study. The main purpose of this study was to propose a new drive system with an MC for two parallel-connected induction motors using the DTC method and SVM consisting of a flux dead-beat scheme.

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Hamouda M, Blanchette HF, Al-Haddad K. Indirect matrix converters enhanced commutation method. IEEE T Ind Electron 2015; 62: 671-679.
Lee KB, Blaabjerg F. Sensorless DTC-SVM for induction motor driven by a matrix converter using a parameter estimation strategy. IEEE T Ind Electron 2008; 55: 512-521.
Casadei D, Profumo F, Serra G, Tani A. FOC and DTC: two viable schemes for induction motors torque control. IEEE T Power Electr 2002; 17: 779-787.
Xiao D, Rahman MF. A novel hysteresis direct torque control for matrix converter drives. EPE J 2011; 21: 40-48.
Maurice F, Ngoc LN, Ana L. Direct torque control – a solution for mono inverter-dual parallel PMSM system. In: 21st Mediterranean Conference on Control and Automation; 25–28 June 2013; Platanias-Chania, Crete, Greece: IEEE. pp. 1477-1483.
Gunabalan R, Sanjeevikumar P, Blaabjerg F, Ojo O, Subbiah V. Analysis and implementation of parallel connected two-induction motor single-inverter drive by direct vector control for industrial application. IEEE T Power Electr2015; 30: 6472-6475.
Xu F, Shi L, Wang K, Li Y. A control strategy of dual induction motors fed by single inverter for traction system. In: IEEE Transportation Electrification Conference and Expo, Asia-Pacific (ITEC Asia-Pacific); 31 August 2014; Beijing, China: IEEE. pp. 1-6.
Matsuse K, Kouno Y, Kawai H, Yokomizo S. A speed-sensorless vector control method of parallel-connected dual induction motor fed by a single inverter. IEEE T Ind Appl 2002; 38: 1566-1571.
Matsuse K, Kawai H, Kouno Y, Oikawa J. Characteristics of speed sensor less vector controlled dual induction motor drive connected in parallel fed by a single inverter. IEEE T Ind Appl 2004; 40: 153-1561.
Friedli T, Kolar JW. Comprehensive comparison of three-phase AC-AC matrix converter and voltage DC-Link back-to-back converter systems. In: IEEE 2010 International Power Electronics Conference (IPEC); 21 June 2010; Sapporo, Japan: IEEE. pp. 2789-2798.
Friedli T, Kolar JW. Milestones in matrix converter research. IEEJ J Ind Appl 2012; 1: 2-14.
You K, Xiao D, Rahman MF, Uddin MN. Applying reduced general direct space vector modulation approach of AC–AC matrix converter theory to achieve direct power factor controlled three-phase AC–DC matrix rectifier. IEEE T Ind Appl 2014; 50: 2243-2257.
Matsuse K, Kezuka N, Oka K. Characteristics of independent two induction motor drives fed by a four-leg inverter. IEEE T Ind Appl 2011; 47: 2125-2134.
Lim CS, Rahim NA, Hew WP, Levi E. Model predictive control of a two-motor drive with five-leg-inverter supply. IEEE T Ind Electron 2013; 60: 54-65.
Nguyen TD, Lee HH. Development of a three-to-five-phase indirect matrix converter with carrier-based PWM based on space-vector modulation analysis. IEEE T Ind Electron 2016; 63: 13-24.
Ninad NA, Lopes L. Per-phase vector control strategy for a four-leg voltage source inverter operating with highly unbalanced loads in stand-alone hybrid systems. Int J Elec Power 2014; 55: 449-459.
Joshi BM, Chandorkar MC. Effect of machine asymmetry on a two-machine direct torque controlled induction motor drive. In: EPE 2011 Proceedings of 14th European Conference on Power Electronics and Applications; 30 August–1 September 2011; Birmingham, UK: IEEE. pp. 1-10.
Mohktari H, Alizadeh A. A new multi-machine control system based on Direct Torque Control algorithm. In: IEEE 2007 International Conference on Power Electronics; 22 October 2007; Daegu, Korea (South): IEEE. pp. 1103-1108.
Jones M, Levi E, Iqbal A. Vector control of a five-phase series-connected two-motor drive using synchronous current controllers. Electr Pow Compo Sys 2005; 33: 411-430.
Xu F, Shi L, Li Y. The weighted vector control of speed-irrelevant dual induction motors fed by the single inverter. IEEE T Power Electr 2013; 12: 5665-5672.
Joshi BM, Chandorkar MC. Vector control of two-motor single-inverter induction machine drives. Electr Pow Compo Sys 2014; 42: 1158-1171.