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This paper presents a random space vector pulse width modulation (SVPWM) strategy for a three-phase voltage source inverter based on Field Programmable Gate Array (FPGA). It is more flexible and faster to realize randomization algorithm in FPGA than digital signal processor (DSP). What's more, it is easily extensible for multiphase driving systems with FPGA. Models in Simulink and an experiment platform...
In this paper, two dual random space vector pulse-width modulation (RSVPWM) methods, Random Switching Period-Random Zero Vector Timing SVPWM (RSP-RZVT-SVPWM) and Variable Daley-Random Zero Vector Timing SVPWM (VD-RZVT-SVPWM), are proposed to apply in five-phase inverters. The proposed RSVPWM methods can decrease the amplitudes of high harmonics and spread harmonics concentrated around switching frequency...
In this paper, two modified space vector pulse width modulation (SVPWM) methods are presented. The relationship of them is comprehensively studied. A variable factor ko is introduced into the unified voltage modulation method. Due to factor ko, the time duration of application of two zero state vectors is made changeable from 0 to 100% over the sampling period for their combined application, which...
This paper, based on the three dimension (3D) coordinates, presents the cause of the zero-sequence voltage in the open winding asynchronous motor system which is driven by double inverters with single power supply. The large vectors which have zero-sequence voltage are selected to realize PWM. For eliminating the zero-sequence voltage, the space zero vectors are inserted in every control period. This...
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