Study on speed sensorless vector control of Brushless Doubly-Fed Machine

The Brushless Doubly-Fed Machine (BDFM), which removes the brush and slip ring, improves security and reliability. The BDFM is proposed to have a bright prospect as an AC drive system or variable-speed constant-frequency power generation system. Vector control is widely studied in the BDFM, but the information of rotor speed and position must be obtained. This paper presents speed sensorless vector control strategy for BDFM double synchronous speed two-axis rotating coordinate mathematical model based on model reference adaptive speed identification theory. Vector control model in Matlab/Simulink environment is designed with popov stability theory. The simulation results verify that this system has good stationary and dynamical property.