Sliding mode pulse width modulation for voltage control of a Voltage Source Inverter

Abstract

In this paper, a Sliding Mode Control (SMC) based Pulse Width Modulation (PWM) method is proposed for the voltage control of a three-phase Voltage Source Inverter (VSI). This variable frequency PWM method is designed such that the average of the outputs, i.e., the three-phase voltage of VSI and the neutral point voltage of a star connected load, track the desired references. A suitable mathematical model of VSI is derived. Because of the control objective which is the tracking of a desired reference by the average of discontinuous output, some integral sliding surfaces are defined. Based on the mathematical model and the defined sliding surfaces, a controller is designed to generate suitable signals for the gates of the VSI switches. Simulation results verify the satisfactory performance of the proposed method.

Generation of PWM Based on Simple Relay Feedback Systems

“…We can notice that similar results have been obtained by applying the theory of Locus of a Perturbed Relay System (LPRS) [5]. Under the approximation of slow variation of the reference signal with respect to the period of self-oscillation, comparable results have been also obtained by [8].  If we consider 0 0 r  and hE  in (9), then we can notice that the period…”

“…With a similar configuration of an RFCS used as a DC/AC PWM with variable frequency inverter, under the assumption of slow variation of the reference signal compared to pulse durations, similar results to our approach have been obtained by [8]. As known in PWM systems, the tracking capability of our control system is expressed in the relationship of the mean value of the output signal () ut relatively to the reference signal.…”