Selective Periodic Disturbance Elimination Using Extended Harmonic State Observer for Smooth Speed Control in PMSM Drives

Active Disturbance Rejection Controller for Smooth Speed Control of Electric Drives Using Adaptive Generalized Integrator Extended State Observer

“…To improve the system stability, torque control method with high bandwidth should be adopted. For example, PIR controller is employed for current regulation in [4]. However, the measures to deal with the deteriorated tracking performance caused by the PIR controller complicates the algorithm [16].…”

“…However, the large low-order torque ripple due to the open slot and manufacturing imperfection causes speed ripple, resulting in large vibration, acoustic noise, and low control precision [3]. The dominant torque ripple sources include cogging torque, flux harmonics, current harmonics, and current measurement error [4]. To alleviate the effect of torque ripple, there are two types of methods that can be used [5].…”

“…Nevertheless, high-frequency disturbances are not considered either. To reject the high-order torque ripple harmonics, M. Hu et al [4] employs the PIR controller for current control so that the delay caused by inner current loop can be eliminated. However, the PIR current controller complicates the algorithm.…”

“…In this paper, ADR controller using GIESO is used to achieve smooth speed control of electric drives. Different from the system in [4], the system in this paper adopts the widely used deadbeat active distubance rejection controller [24] for current control. To solve the instability problem caused by the two-step delay in the current control loop, an adaptive GIESO is developed.…”

Mismatched disturbance compensation enhanced robust H∞ control for systems with nonvanishing uncertainties/disturbances

“…For examples, the DO ( 18) can be replaced by the linear disturbance observer established based on the model of disturbances if the characteristic of disturbances has been obtained based on data, 15 by the generalized proportional integral observer if the higher derivatives of disturbances tend to be constants, 22 and by the harmonic observer if the disturbances fluctuate periodically. 38 In addition, the compensation of nonvanishing disturbance derivatives of disturbances should be further introduced to avoid the deterioration of control precision. Although the disturbance observation error system may be different from (23), through the similar systematic synthesis and analysis steps, conditions similar to those given in Theorem 1 can be constructed to guarantee the robustness of system.…”