SAFE AND TIME-OPTIMIZED POWER TRANSFER BETWEEN 2 INDUCTION LOADS SUPPLIED BY A SINGLE GENERATOR

The paper deals with the problem of transferring power between differe nt induction loads supplied by the same current generator, in as short a time as possible. In the reference solution, the system is complete ly stopped: It needs a long time for the current to reach zero and, af terwards, its new value, because the dc link inductance must be demagn etized and remagnetized; moreover an auxiliary starter is needed. In t he proposed solution, the input of the current inverter is short-circu ited whenever a transfer must be performed; the inductance remains mag netized and the current at the output of the inverter varies very quic kly: The transfer time is minimal, and no starter is needed; the speci fic inverter control laws used to insure natural commutation are descr ibed. The paper also presents control models of the system, obtained b y using the first harmonic modeling method.