Controlling pulsed inverter fed from constant DC voltage source - using vector modulation to produce required voltage vectors at 60 deg. electrical to one another with voltage output vectors at centre of each angular range

摘要

The vector modulation process provides a three-way side pulse pattern for controlling a current regulator supplied from a DC voltage source using semiconductor switches in a three-phase bridge circuit. In the stationary operating mode six required voltage rotors of equal magnitude are provided in each basic oscillation period, spaced apart from one another by 60 degrees electrical, each voltage vector lying in the same direction as a required voltage vector used with the two adjacent voltage vectors. The pulse times are selected so that the given required voltage vectors define the voltage mean value of the regulator output voltage. ADVANTAGE - Reduced harmonic content of regulator output and rapid dynamic regulation.