Detecting Broken Bars in Submersible Motors under Variable Frequency Power Supply and Harmonic Management of Power Grid

Aiming at the problem of frequent broken bars of submersible motors powered by variable frequency power supply and generating harmonics to the power grid, this paper presents a comprehensive diagnostic method based on the current spectrum of the grid side, the rectifier DC side and the motor stator side and uses the active power filtering scheme to perform harmonic compensation on the grid-side current to improve grid quality. The simulation model is built in MATLAB / Simulink to verify the effectiveness of the proposed method.