Research Of Induction Motor Parameter Identification

With the development of EMU in our country, modern AC drive traction control system in high performance becomes an important research project. Research on parameter identification of traction motor in EMU is a key role in the improvement of performance in traction drive control. The thesis is based on the subject of "Research on motor parameter indentification methods", which is one part of the key project of the national research program, with the title of "Traction drive and break of high speed train". It takes research on off-line identification method and on-line identification method of a small power induction motor and gives a basis for research on traction motor parameter identification.In this thesis, the induction motor parameters self-test algorithm is researched. The stator resistance is identified by rate current method in direct current experiment. The SPWM short-circuit experiment is designed to identify rotor resistance and stator leakage inductance with rotor leakage inductance by the relation between active power and reactive power. The SVPWM no-load experiment is designed to identify mutual inductance by the relation between active power and reactive power. In this algorithm, the correlation function calculated using the power factor, voltage, current amplitude.Rotor resistance on-line identification algorithm in vector control system is then researched. The self adaption rule is proposed by the dynamic error model of the motor and in MATLAB/SIMULINK, this algorithm is reliable through step response and track response simulation analysis. Based on it, the simulation model of the vector control system with rotor resistance on-line identification is constructed. The algorithm is proved effect in vector control system by the analysis on the flux track.Finally, the off-line identification program and rotor resistance on-line identification program are compiled in the two-level experiment platform which is based on TMS320F2812 controller. The result of the induction motor off-line parameters identified is proved to be feasibility of off-line identification algorithm by comparison with the traditional experiment. The rotor resistance on-line identified in vector control system is proved to be feasibility of off-line identification algorithm by comparison with traditional experiment.