Ultra fast voltage control for three-phase UPS

PWM techniques allow the converter output voltage and current controls. If a high dynamic is required, then a local hardware feedback loop needs to be implemented. Therefore, a resonant current controller had been recently studied. Its specifications arc fast response, very low sensitivity to the load´s electrical parameters, extremely low DHT, and a maximum inverter switching frequency firmly controlled. This novel modulator combines two structures: the first acts at lower frequencies for current regulation and the second acts at higher frequencies for switching frequency control by means of a voluntary resonant mode. We investigate an AC three-phase voltage regulation, which uses a single analog loop per phase and involves the new resonant voltage controller. Furthermore, for checking this novel voltage regulation, some experiments involving resistive and inductive loads are performed. We make the single-phase and the three-phase power amplifiers tracking arbitrary and sine waves. Experimental results agree with simulations and demonstrate the excellent performances of this novel voltage regulation.