Load voltage compensation using series-shunt power converter

This paper presents a method of amplitude control and unbalance compensation of the load voltage using a series-shunt power converter. The series power converter works to obtain a constant balanced sinusoidal load voltage. The shunt converter regulates the DC link voltage and compensates for the reactive current of the source within the rated current of the converter. To design the required capacity for the series-shunt power converter, the relation between the converter capacity and the load power factor at constant compensation voltage is introduced. The required capacity of the series-shunt power converter is reduced by more than 50% compared with that of a conventional series power converter. The effectiveness of the proposed load voltage compensation technique using the series-shunt power converter is verified by experiments. (C) 2001 Scripta Technica, Elects Eng Jpn, 136(3): 39-48, 2001.