Discrete-Time Domain Modeling and Design for AC Machine Current Regulation

Complex vector current regulators provide robust performance at high fundamental frequency operation, but there are difficulties in increasing the current regulation bandwidth and in operating at very high fundamental frequencies. In this paper, a discrete-time domain model of general AC machines is proposed. Based on this model, a discrete-time domain current regulator design methodology is proposed. This method is a generalization of the complex vector current regulator´s pole- zero cancellation approach and it furthermore explicitly incorporates and compensates the control delay common in discrete-time implementations.