Robustness Analysis of Pole Placement Method with Single Degree of Freedom in Full Order Flux Observer

Abstract

For the disadvantage of the low flux's observational accuracy of induction motor direct torque control system when it runs in a low velocity, the full order flux observer is used to achieve the stator flux observation.Based on the analysis of four full order flux observer pole placement methods,The impact on observational accuracy and convergence rate was researched with different parameters of the Gain Matrix in the single degree of freedom pole placement method.The simulation results show that to ensure the stability of the system,the impacts on the flux observation were Effectively inhibited when Motor's stator and rotor resistance parameters change through increasing parameter of the Gain Matrix,and the flux observer's robustness was improved.

Wide-Range Sensorless Control for SPMSM Using an Improved Full-Order Flux Observer

“…Equation (17) eliminates the speed information in the denominator [1], [3], [8], [9]. Hence, the gain value does not increase owing to the absence of the speed information when gain k is added for fast offset convergence and stable pole placement.…”

“…If the pole is positive, the system is unstable, whereas the system is stable if the pole is negative. A smaller negative value of the pole means a more stable system [1]- [3], [8], [9].…”

“…(6), can be defined by dividing the real and imaginary numbers from Eqs. (7) and (8) [1]- [6], [8], [9]. Equation (7) is used to obtain the gain of the current, while Eq.…”