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Aiming at the problems of poor loading accuracy and slow response speed of the permanent magnet synchronous motor as a load simulation system, a hybrid flux observation control algorithm is proposed to improve the loading accuracy and speed up the response speed. Hybrid flux observation control algorithm calculates stator flux by using voltage current hybrid observation to complete SVPWM direct torque control; Direct torque control takes torque and stator flux as control variables, but it is difficult to measure torque and stator flux directly in practical application, so it is very important to estimate torque and stator flux accurately. The proposed hybrid model flux observation algorithm can estimate the torque and flux. The simulation results of the algorithm are in agreement with the theoretical analysis, which proves the feasibility of the control strategy. In addition, the designed hybrid flux observation load simulation system can realize the simulation of various load types, such as constant torque load, constant power load and fan pump load. Finally, the experimental platform of load simulation system is built and the experimental results show that the system can accurately estimate the torque and flux.
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