Research Of Sensorless Vector Control System Based On The Quasi-Proportional Resonant Current Regulator

Hybrid-electric propulsion system with shaft generator has become a new research direction of the marine electric propulsion system, which has many advantages, such as flexible operating modes, low fuel consumption, less environmental pollution, low upgrading cost, et al. With the thorough study of the position sensorless technology, the position sensorless control system of the shaft generator under harsh environment will become a hot research direction.The background and the basic composition of the hybrid-electric propulsion system were introduced first in this paper. Then an overview of the control strategies of permanent magnet synchronous motor was presented, followed by several estimating methods of the rotor position and speed of the motor.The vector control theory and SVPWM algorithm were studied, based on which a vector control system of the permanent magnet synchronous motor was designed in details. Then a simulation model of the system was built in MATLAB by the modules in the toolbox of Simiulink. The results of the simulation verified the stability of the system.After that, the theory of sliding mode variable structure was presented, based on which a sliding mode observer was designed with the equations of permanent magnet synchronous motor. In order to achieve real-time online estimation of the rotor speed and position of the motor, the Kalman filter and a saturated function for the buffeting problem were added into the observer. Then the characteristics of the proportional resonant regulator were studied, based on which a more practical quasi-proportional resonant regulator was designed. Combined the observer with the new regulator, a new position sensorless vector control system was proposed. After modeling and simulation, the results verified that with the new regulator, the sliding mode observer had good robustness and feasibility.Finally, the position sensorless vector control system was designed with the digital signal processor TMS320F28335, as a part of the hybrid-electric propulsion system. The designs of the hardware and software were completed in this paper. The experimental results show that with the quasi-proportional resonant current regulator, the control system architecture is simplified, and the performance of the sliding mode observer has also been improved.