FPGA Based Discrete Event Current Control Strategy for a Three Phase Inverter

This paper investigates the possibilities of the design of current control for VSI from the discrete event point of view. Event-driven control approach determines the transistor switching pattern directly from the current error logic signals and is designed using a novel matrix based approach for the description of the discrete event systems. A new approach for description of event-driven systems is introduced. It is based on matrix description of Petri Nets, supplemented with a combination of logic and algebraic equations. The control algorithms designed by proposed approach can be easily implemented on modern DSP an FPGA devices. The approach is illustrated with the design of direct current controller for a three phase inverter fed Permanent Magnet Synchronous Machine and is examined with simulations and experimentally confirmed.