MINIMUM-ENERGY CONSUMPTION OF A DOUBLE STATOR INDUCTION MOTOR OPERATING IN DYNAMIC REGIME

Abstract

In this paper a problem of energy optimization of a double stator induction motor (DSIM) is considered. Using the concept of a rotor field oriented control (RFOC), the DSIM Blondel-Park model is used as dynamic constraints in an optimal control problem. A cost function consists of linear combination of magnetic energy, copper losses and mechanical power is minimized in order to find minimum-energy rotor flux trajectories. From calculus of variations a system of nonlinear differential equations are obtained, and analytical solutions are achieved in the case of accelerate and decelerate mode of the DSIM speed. These solutions gave during the two modes a time varying trajectories of a minimum-energy rotor flux. These trajectories are implemented in the optimal rotor flux oriented control (ORFOC) of the DSIM and compared to the conventional RFOC at different dynamic regime of the DSIM. Simulation results are given and improved the effectiveness of the proposed strategy.