Brushless doubly-fed motor integrated parameter identification method based on steady-state electric quantity amplitude sampling

Abstract

The invention belongs to the technical field of motor control, and provides a brushless doubly-fed motor integrated parameter identification method based on steady-state electric quantity amplitude sampling, the method is realized based on a general reduced order dq mathematical model of a brushless doubly-fed motor, simple open-loop control under a no-load and pure resistive load working condition is only needed, and the identification accuracy of the brushless doubly-fed motor integrated parameter is greatly improved. The method is suitable for different occasions of independent operation, grid-connected operation and the like, is suitable for brushless doubly-fed motors with different structural design processes, and has good universality; all parameters rc, Lpe, Lce and Me in the reduced-order model are directly identified based on simple calculation, processing such as approximate conversion is avoided, errors introduced in the intermediate identification and complex calculation process can be avoided, and good accuracy is achieved; and meanwhile, only voltage and current amplitude and frequency data are needed, dq component data are not needed, so that the rotor position angle information is not required to be acquired, and the method can be universally used in application occasions with coded discs and without coded discs.

Description

Technical field [0001] The present invention relates to motor control techniques, and more particularly to a brushless dual-fed motor integrated parameter identification method based on steady-state power amplitude sampling. Background technique [0002] In the context of my country's "Double Carbon" goal, wind power technology presents high-speed development trend. In wind power, the current mainstream model is a brush double motor, and the inverter of the power generation system is small, and it can achieve active power, reactive power controllable. However, since the type of motor contains a relatively impaired brush ring, the failure rate and maintenance cost of its power generation system is high, especially in applications such as sea wind power, remote mountainous area, etc., system maintenance difficulties Increase. The brushless dual-feed motor is designed for special structural design, and the advantages of traditional dual-input motors can be used to remove high reliab...

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Problems solved by technology

The calculation process of the above method is simple, the response is fast, and the engineering practicability is good. However, the structure of the brushless doubly-fed motor is more complicated, the motor parameters are more and the mutual coupling characteristics are more complicated, and it is difficult to use the above parameter identification method to meet the modeling and application requirements of the brushless doubly-fed motor. Control parameter requirements

[0006] It can be seen that the defects of the existing technology are: the existing brushless doubly-fed motor parameter acquisition method mostly needs the voltage and current dq component data, which cannot be applied when the rotor position angle information is unknown, and is relatively difficult for the stand if there are stalls, short circuits, etc. Many changes are inconvenient to implement in applications with limited space. In addition, due to the more complex motor structure, more parameters and tighter coupling, it is difficult to obtain the parameters of brushless double-fed motors using the method of asynchronous motors or traditional double-fed motors.

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