A novel continuously variable single to three phase load matching circuit

This paper describes a continuously variable single to three phase load matching circuit. The phase balancer is realized using two thyristor controlled inductors together with a fixed capacitor bank. It is designed to balance a variable single phase load on the three phase supply network. The paper provides a simple analysis of the phase balancer and a novel method of realizing disjoint closed loop control of the two thyristor-pair firing angles is described. The implementation of the closed loop control using a M6809 microprocessor is briefly outlined and experimental results obtained with a laboratory scale prototype are included.