VOLTAGE SYSTEM LINKAGE INVERTER SYSTEM

摘要

PROBLEM TO BE SOLVED: To suppress harmonic components flowing through the linkage point between a commercial AC power supply and a system linking inverter securely, by a method in which a harmonic correction signal from a harmonic correction signal generating means and a control signal from an inverter output current control circuit are synthesized and the pulse width modulation control is applied to the inverter in accordance with the synthesized signal. SOLUTION: The output of a voltage transformer 15 which detects the AC voltage of the linkage point between a commercial AC power supply 8 and an inverter 3 is inputted to a harmonic detection circuit 16 to detect harmonic components in an AC voltage. The harmonic component is inputted to a harmonic correction signal generating circuit 17 to output a harmonic correction signal of required order in accordance with that harmonic component. The harmonic correction signal and a control signal from an inverter current control circuit 11 are synthesized and the pulse width modulation control is applied to the inverter 3 by a PWM controller 13 in accordance with the synthesized signal. With this constitution, the harmonic components flowing through the linkage point between the commercial AC power supply 8 and the inverter 3 can be suppressed securely.