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

A stator current vector, electrical loss technology, applied in torque ripple control, electronic commutation motor control, vector control systems, etc., can solve the problems of permanent magnet synchronous motor torque ripple, low frequency, single and so on

CN111835252AActive Publication Date: 2020-10-27NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-10-27

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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.
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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...

Examples

Embodiment Construction

[0043] The present invention is realized by the following technical solutions:

[0044] 1. Derivation of minimum loss constraints

[0045] PMSM losses mainly include iron loss, copper loss, and mechanical loss. The mechanical loss is mainly caused by bearing friction. Copper loss, while ignoring mechanical loss, establishes as attached Figure 1-2 The dq-axis equivalent circuit of the PMSM is shown.

[0046]

[0047] The electromagnetic torque equation can be written as:

[0048]

[0049] The total loss P of the PMSM system Loss for:

[0050]

[0051] When the PMSM system is in a steady state, the electromagnetic torque T e and speed ω r are constants, namely i wq is also a constant; at this time, the total loss P of the PMSM system Loss only with i wd related. Therefore, to find the optimal stator current when the loss is the smallest, only need to solve d-axis current active component i wdref .

[0052]

[0053] At this time, the d-axis current is e...