Abstract
In recent years, interest in the use of multi-phase (more than three-phase) dc/ac inverters in applications such as electric vehicles, electric traction, more electric aircraft, ship propulsion, aerospace applications, etc. has been increasing day by day. The paper presents the Discontinuous Space Vector Pulse Width Modulation (DSVPWM) technique for control of a five-phase two-level inverter. The five-phase DSVPWM algorithm uses zero, medium and large vectors combination. When calculating vectors dwell times, calculations are made by directing the Vref to Sector-1 regardless of which sector it falls into. Thus, complex calculations are reduced. DSVPWM controlled five-phase two-level inverter that feeds an RL load is simulated using MATLAB/Simulink-Simscape blocks. To demonstrate the effectiveness of the used DSVPWM algorithm, five-phase inverter's output voltages, current waveforms and their FFT analysis are given for different modulation indexes and switching frequencies.
Highlights
Conventional variable speed electric drives, widely used in industry, consist of a three-phase power electronic converter and ac motor/motors
In the event of a fault, a five-phase motor can continue to operate by creating a rotating magnetic field with its solid two phases. This high fault tolerance has increased the interest in using multiphase motors in sensitive applications that are very popular today, such as electric vehicles, electric locomotives, ships and space applications [5, 6]
32 switching states and the associated voltage space vectors form in a five-phase inverter with ten switches
Summary
Conventional variable speed electric drives, widely used in industry, consist of a three-phase power electronic converter and ac motor/motors. 32 switching states and the associated voltage space vectors form in a five-phase inverter with ten switches In this way, five-phase inverters allow better adjustment of flux and torque in the motor compared to threephase inverters. In DSVPWM, it is aimed to reduce switching losses and total harmonic distortion (THD) in output current by making less number of switching This can be done by arranging the placement of the zero voltage vectors in a switching period. Reducing switching losses in multi-phase drive systems means increasing energy efficiency, as the application areas are high power range and the number of switches is more [12]. The DPWMMAX scheme of DSVPWM is proposed to obtain low THD output from the inverter output even at low modulation indices This algorithm was developed as software using S-Function blocks in MATLAB/Simulink environment.
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