Abstract
This paper presents a simulation method of load characteristics of high-power permanent magnet synchronous motor (PMSM) drive system. According to the structural characteristics of the PMSM drive system of electric tractor, the load simulation experiment system is built to simulate the load characteristics of high-power PMSM. Next, on the basis of the similarity principle, the parametric equivalent scaling principle of the high-power PMSM drive system and experimental PMSM is established. Then, a dynamic load tracking algorithm is proposed based on the PI controller and the structure of load simulation experiment system, and the low-pass filter (LPF) is introduced to reduce noise interference caused by the differential term of speed. Finally, the numerical simulations and experiments are presented according to the schematic diagram of the load characteristic simulation and dynamic load tracking strategy. The results demonstrate that the proposed simulation method of load characteristics can effectively simulate the dynamic load of high-power PMSM drive system, which lays a foundation for the verification of the PMSM speed control strategy.
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