Conceptual study of a shunt power quality compensator

This paper describes how the different methods of eliminating the power disturbances: (1) outages by shunt UPS action, (2) low frequency harmonic disturbances by the "virtual short circuit" principle, (3) swells/sags by the inductive/capacitive reactance principle, (4) high frequency disturbance by passive filtering, can all be integrated into a single strategy based on Reference Voltage Tracking Control. The Control Law has been derived from first principles. Digital Simulation results are presented to prove that the strategy fulflls the multi-functional requirements. The PWM Converter which implements the Control Law is modelled as an ideal linear amplifier.