Active flux based V/F with stabilizing loops control versus vector control of IPMSM

Abstract

The present thesis proposes a novel approach of V/f with stabilizing loops control, suitable for all AC General Drives, with Interior Permanent Magnet Motor, used as a case study. The main target is to prove that this control method can provide fast speed and torque control, without the use of PI speed and current controllers, without coordinate transfomations and with reduced computation effort, than in sensorless vector control. This control method is based on active flux concept, it includes the maximum torque per ampere condition and the capability of the drive to work above base speed. Comparisons with existing sensorless control methods have been conducted and results have been interpreted. To prove once more the stabilizing loops effectiveness, simulation and experimental tests have been performed with open loop V/f control. Increased system stability and fast dynamic performances have been obtained after the two stabilizing loops consideration. Four different V/f with correction loops control methods have been analytically studied and tested: one of them through both digital simulations and experimental verification, the other three strategies, through digital simulations. Results show significant results for two of them.