Lyapunov-based control for three-phase PWM AC/DC voltage-sourceconverters

摘要

The three-phase pulsewidth modulation (PWM) AC/DC voltage-sourcenconverter with the control laws proposed so far is not only unstablenagainst large-signal disturbances, but also has the problem that itsnstability depends on the circuit parameters such as the DC-outputncapacitance. This paper describes a new control law based on Lyapunov'snstability theory. It is shown that the converter can be stabilizednglobally for handling large-signal disturbances. The resultingnclosed-loop system not only guarantees a sufficient stability regionn(independent of the circuit parameters) in the state space, but alsonexhibits good transient response both in the rectifying and regeneratingnmodes. Also, a new simulation technique is introduced which increasesnthe speed of the simulation process considerably. Computer simulationsnare presented to confirm the effectiveness of the proposed controlnstrategy and the validity of the simulation technique. Experimentalnresults are also presented to verify the theoretical and simulationnstudies