Modeling and simulation of current-controlled PWM strategy with regular sampling for constant switching frequency

This paper presents an appropriate digital current-controlled pulse width modulation method for limiting the switching frequency in voltage-source PWM inverters. The method is suitable for numerical implementation generating switching instants only at constant sampling period given by a fixed clock frequency. To guarantee sequential voltage vector selection which allows only one of the inverter legs to change its state during the sample period, the sampling signal given by fixed clock is shifted 120 degree each other. The validation of proposed current-controlled PWM strategy with regular sampling is illustrated by means of simulation, in programming and simulation environment MATLAB Simulink ® , Also, the proposed current-control technique will be compared with other PWM techniques from point of view of total harmonic distortion.