ADAPTIVE BALANCING COMPENSATOR

Reactive power compensators with thyristor switched inductors and shun t capacitors enable an adaptive compensation at the price of the harmo nic distortion increase. This distortion is even higher if the compens ator is controlled asymmetrically to reduce the effects of the load un balance. Harmonic distortion may increase, moreover, because of the co mpensator resonance with the supply system reactance. This paper sugge sts a modification of the balancing compensator structure that reduces the harmonic currents injected by the compensator into the supply. Th e structure suggested also reduces the possibility of the compensator resonance with the supply source inductance. The paper discusses the r equired control range of the compensator susceptances and their freque ncy properties and suggests an efficient method of measuring the load parameters needed for the compensator control.