A New Algorithm of PWM Converter Control for Current Harmonics Generation

This paper proposes new fixed switching frequency control techniques for power active filters. New circuit models are proposed for voltage source inverters. These models are very convenient for computing the capacitor voltage of such inverters. Analyzing such models the new method of capacitor voltage control can be deduced. Also a new method of voltage source inverter control can be deduced from this analysis. The method is based on auxiliary capacitance function. This function is equivalent to time-varying capacitance. Such capacitance function can be computed when reference signal is known. The fixed switching frequency control techniques for PWM voltage source inverter can be easy obtained when auxiliary capacitance function is known. The example of the capacitance function for the voltage waveform improvement is presented in the paper.