Numerical simulation method for the slip power recovery system

A numerical simulation method for the slip power recovery system is present ed. The rig induction-machine model. using flux linkages as state variables is used. This leads to a simple and efficient computer program. The diode bridge rectifier is modelled using three switching functions that are deter mined by the sign of the corresponding AC currents. The model obtained is v ery simple, and accurately represents the three-phase diode bridge rectifie r including the current commutation process. To merge the models of the ind uction machine and the diode-bridge rectifier, no difficulties arise when a direct-voltage intermediate circuit is present. When a direct-current circ uit is used in the intermediate circuit a model of the whole 'induction mac hine and diode-bridge rectifier' must be used. Park's variables can be used in this case, also. The operations performed to model the system are equiv alent to assuming that the diode bridge rectifier and the DC circuits are t ransformed into a nonlinear circuit connected to the rotor terminals. MATLA B/simulink is used to integrate the equations. Experimental and simulated r esults are presented and compared showing good accuracy.