Space vector PWM techniques for dual three-phase AC machine: analysis, performance evaluation and DSP implementation

The major drawback of usual dual three-phase AC machines (6φM), when supplied by a voltage source inverter (VSI), is the occurrence of extra harmonic currents. These extra currents circulate only in the stator windings and cause additional losses. One solution to reduce their amplitude is to act on the supply side using dedicated PWM control strategies. The aim of the present paper is to investigate new space vector PWM (SVPWM) techniques suitable for 6φM and to perform a detailed analysis and a performance evaluation. The proposed performance criteria, specific to VSI fed 6φM, lead to analytical formulas and graphics, which aid the design of high-performance PWM techniques and demonstrate the superiority of proposed SVPWM techniques. Experimental results carried out on a 15 kW prototype machine and using a low cost fixed point TMS320F240 DSP are given and discussed.