Parallel type instant low variable voltage control method and parallel type instant of the compensator it is low the compensator

摘要

Provided are a voltage control method and a voltage control device which are capable of suppressing the distortions of load current (IL) and load voltage (VL) from when a momentary voltage drop occurs until the momentary voltage drop is detected. The voltage control device has an inverter (3) connected to the load (8) side via an AC filter (4) using a coil and a capacitor and configured as an LC or LCL filter. The inverter (3) performs control so that the oscillation of capacitor current (IC) is always suppressed.