The aim of the present paper is the study of the behaviour of passivity based control and difficulties due to synthesis for various operating conditions of a synchronous motor with a permanent magnets. The study takes into account the guarantee of satisfactory static and dynamic performance. It also allows the system to be insensitive to disturbances and uncertainties on the parameters. A number of estimation techniques have been developed to achieve speed and position sensorless permanent magnet synchronous motor (PMSM) drives. Most of them suffer from variation of motor parameters such as the stator resistance, stator inductance and torque constant. Also it is known that conventional linear estimators are not adaptive variations of the operating point in a nonlinear system.
Recent developments in electrical machines, power electronics, and control theories help the variable speed drive technology to offer precise speeds at every level of operation. In that same context, this study investigated on improving the performance of variable speed drive based on a permanent magnet synchronous motor by rejecting the external disturbance in speed control using the passivity-based control and sliding mode control approach. The sliding mode control approach is implemented with an exponential reaching law to improve the robustness of the system. Furthermore, a passivity-based q-axis current loop and d-axis current loop controllers are detailed. The system stability with the proposed scheme is mathematically proved using Lyapunov stability criteria. Simulation results are provided to demonstrate the superior properties of the proposed control method using MATLAB Simulink.
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