Finite state machine controller for a three-level active harmonic compensator

Abstract

A three-level Active Harmonic Compensator (AHC) switching controller is implemented using a Field Programmable Gate Array (FPGA). An FPGA enables quick implementation of complex logic circuits that can be easily modified through reprogramming. The switching control logic uses a finite state machine within the FPGA to implement fixed band hysteresis current control. The three-level inverter uses a new topology that is presently used in an existing analogue AHC. Simulations are presented using the finite state machine design and operation is verified through a low power experimental unit operating as a current injection unit.