This paper describes voltage-controlled delta-modulation scheme for active power filters, which is to control the harmonic-compensating current indirectly by adjusting the capacitor voltage to be sinusoidal. The overall control system has two feedback...
This paper describes voltage-controlled delta-modulation scheme for active power filters, which is to control the harmonic-compensating current indirectly by adjusting the capacitor voltage to be sinusoidal. The overall control system has two feedback loops : one is the outer proportional feedback for loop regulating the de current of the active filter and the other is the inner feedback loop for maintaining the ac current waveform to be sinusoidal, and to have zero power factor angle(i. e. unity power factor). The characteristics of the proposed scheme are investigated by digital simulation using ACSL.