Flexible load vibration and PMSM torque ripple comprehensive inhibition method considering electrical loss under stator current vector orientation

Abstract

The invention discloses a flexible load vibration and PMSM torque ripple comprehensive inhibition method considering electrical loss under stator current vector orientation. The control method comprises the following steps: deducing a stator current constraint condition under a minimum loss condition based on a PMSM minimum loss mathematical model; and then combining a dynamic mathematical model of PMSM under current vector orientation with a vibration model of a permanent magnet synchronous motor, and establishing an overall mathematical model of the permanent magnet synchronous motor drivingthe permanent magnet synchronous motor considering the electrical loss of the motor. According to the invention, constraint conditions of STS vibration, electrical loss and torque ripple comprehensive control of a permanent magnet synchronous motor are deduced, and then based on a backstepping control principle, a flexible load vibration and PMSM torque ripple comprehensive inhibition method (short for a closed-loop I / f comprehensive control method) considering electrical loss under stator current vector orientation is provided under an I / f control framework; in order to accurately obtain a speed signal, the invention also designs a PMSM speed identification algorithm based on a least square method; and the results of simulation and experiments prove that the provided closed-loop I / f comprehensive control method can enable the state variables to quickly and accurately track respective reference values, torque pulsation and load vibration are effectively inhibited, and the operation efficiency of the system is improved.

Description

technical field [0001] The invention relates to a control method of a permanent magnet synchronous motor, and belongs to the technical field of motors. Background technique [0002] For modern power systems, it has become a common trend for a large number of new renewable energy sources to be connected to the grid. The intermittency and uncontrollability of new renewable energy will adversely affect the basic operation rules of the existing power network, and it is urgent to develop energy storage technology. Spiral torsion spring (STS) has the characteristics of large energy storage, high power density and long life. The application of STS to the field of energy storage has received extensive attention and research. Permanent magnet synchronous motor (PMSM) has the advantages of simple structure, large torque-to-inertia ratio and small loss, and is selected as the driving motor for energy storage. When the PMSM drives the flexible load STS to store energy, the vortex spri...

AI Technical Summary

Problems solved by technology

When the PMSM drives the flexible load STS to store energy, the vortex spring receives external force and winds into the main shaft, which will cause a series of mechanical resonances with low frequency and considerable amplitude; at the same time, due to the non-ideal design of the motor structure, the distortion of the air gap magnetic field and the inverter The torque of the permanent magnet synchronous motor has a large pulsation due to the nonlinearity and other reasons

Both will adversely affect the stable operation of the unit

Most of the existing studies on these three issues are single, but in fact these three issues will be coupled and affect each other

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