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Comparative Study of Disturbance Observer-Based Control and Active Disturbance Rejection Control in Brushless DC Motor Drives

Disturbance Observer-Based Control (DOBC) and Active Disturbance Rejection Control (ADRC) are effective control techniques to deal with disturbances. This paper introduces and applies both DOBC and ADRC to Brushless DC (BLDC) motor drives system. The system is described by Energetic Macroscopic Representation (EMR) method which has recently become powerful approach for the systems related to energy transformation. By using EMR, the system can be described in a comprehensive and visual way, thus the control design becomes simple and easier. The EMR of BLDC motor drives is presented; the inversion-based control system is deduced from EMR; both DOBC and ADRC are employed based on the basis of inversion- based control system to improve performance of motor drive system. The simulation in Matlab/Simulink is realized to evaluate the control effect of DOBC, ADRC and conventional method in some scenarios: an unexpected change load and a parameters variation.