POWER FLOW ANALYSIS AND EFFICIENCY OPTIMIZATION OF A DOUBLY FED SYNCHRONOUS MACHINE

ABSTRACT This paper deals with the energy balance of the doubly fed synchronous machine (DFSM). The proposed method is based on the principle which consider that the electro–mechanical conversion takes place between stator circuits and the machine shaft, so that the electrical power applied to rotor circuits is taken as a command. From this point of view, the study stresses are: Stability, A low ratio of the rotor command referred to the converted energy, High efficiency. Results are presented in the rms value of rotor applied voltage (V2a) – angle between the stator and the rotor voltages vectors (5) plane. We have found, when we vary the slip (s), that the high efficiency areas move in such way that the ratio of s over V2a remains constant (which means a constant rotor flux).