Event-driven approach to overall control design for three phase inverter

This paper presents event-driven approach to design, simulation and implementation of integrated current control, protection and monitoring functions for three-phase inverter-fed motor. The direct current controller determines the inverter switch state from the current error information with no additional controller and modulator. The drive protection and monitoring is based on the observation of logical control and drive operation critical signals such as heat-sink temperature, DC-link voltage and maximum current. To describe such combination of time and event-driven functionality, drive is considered as discrete-event driven system and a new, matrix based approach to the modeling of discrete event systems is introduced. Modeling of the structure of discrete event-driven system is based on matrix representation of Petri Nets. The discrete dynamics of such a system is described by transferring the system among its specific discrete states, which is denoted using a combination of algebraic and logic equations. To confirm the proposed approach, simulation and experimental results are presented. The proposed algorithm was implemented on FPGA, which is considered as an alternative to the DSP based implementation. Furthermore, some benefits of the FPGA based implementation are presented.