POWER-SYSTEM VOLTAGE BALANCING CONVERTER

This paper deals with the design, the control and the simulation of a voltage balancing static converter for a three phases utility distribu tion. Unbalancing sources and compensator structures are studied and c ompared. The balancing method consists in injecting the load currents negative and zero sequence in opposite phase by means of a PWM voltage source inverter. The identification of the load currents negative seq uence is based on the fluctuating active and reactive power computing allowing a transient state compensation. A general formulation is prop osed allowing to relate the unbalance parameters to the inverter desig n. The compensation currents and the DC voltage loops are studied and carried out. Presented simulation results allow to validate control lo ops and to refine the theoretical study on the basis of a specificatio n. This study has been supported by a research contract between the LE EI and the CENTRALP Automatismes company.