Improved MRAS speed observation method

A speed and self-adaptive law technology, which is applied in the closed-loop speed observation field based on improved model reference adaptation, can solve the problems of speed estimation accuracy, complex system design, large amount of calculation, etc., and achieves good control effect and high observation accuracy. , The effect of excellent anti-load disturbance performance

Inactive Publication Date: 2018-04-24
CHAJNA MAJNING DRAJVS EHND AUTOMEHJSHN KO
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Problems solved by technology

The closed-loop observation method based on the torque angle needs to perform an integral operation on the rotor voltage, which introduces an integral drift; the speed observation method based on the power angle avoids the integral operation of the rotor voltage, but its speed observation is affected by the control accuracy of the current inner loop
Based on the observation method of excitation current and stator voltage, the principle is simple and the control is clear, but the mutual coupling between the speed observation loop and the doubly-fed motor control loop makes the system design more complicated and it is difficult to guarantee its efficiency
The extended Kalman filter method and the method based on neural network are respectively proposed. The former is too computationally intensive, and the speed estimation accuracy is also affected by the change of motor parameters; the latter has good fault tolerance and anti-harmonic interference, but its repeated Learning and training takes a lot of time, and there is still a certain distance from industrial applications

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Embodiment Construction

[0036] In order to deepen the understanding of the present invention, the present embodiment will be described in detail below in conjunction with the accompanying drawings.

[0037] According to the mathematical model of the double-fed motor in the two-phase static coordinate system, the stator flux model can be constructed, and the voltage model and current model can be obtained, as shown in the following formulas (1) and (2):

[0038]

[0039]

[0040] In the formula: u sα , u sβ are the components of the stator voltage on the α and β axes respectively; i sα ,i sβ ,i rα ,i rβ are the components of the stator and rotor currents on the α and β axes, respectively; ψ sα ,ψ sβ ,ψ rα ,ψ rβ are the components of the stator and rotor flux linkages on the α and β axes; R s , L s , L m are the winding stator resistance, equivalent self-inductance and equivalent mutual inductance in the αβ coordinate system, respectively.

[0041] will not contain the physical quanti...

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Abstract

The invention relates to an improved MRAS speed observation method. According to the improved MRAS speed observation method, a reference model and an adjustable model are established by means of a voltage model and a current model of a stator flux linkage, a stator flux linkage observer is constructed by adopting a first-order low-pass filter cascaded method, a flux linkage amplitude discrete iterative processing method is proposed, a self-adaptive law is designed based on a Popov hyperstability theorem, a variable PI regulator based on output generalized deviation is designed for speed observation, the speed sensorless vector control of a doubly-fed motor is realized, and a reference and a basis are provided for industrial field application.

Description

technical field [0001] The invention relates to an MRAS speed observation method, in particular to a closed-loop speed observation method based on an improved model reference self-adaptation. Background technique [0002] In the doubly-fed motor speed control system, in order to achieve high dynamic and steady-state performance control of the control system, it is necessary to install a speed sensor to obtain accurate motor speed for closed-loop control. However, the high-precision speed sensor is expensive and difficult to install and maintain. At the same time, the speed signal is easily connected with interference noise during the transmission of the signal line, which reduces the speed and causes excessive impact of the starting current, which will directly damage the inverter and the motor. [0003] In recent years, the speed sensorless control of doubly-fed motors has gradually attracted people's attention. Compared with the sensorless control of cage induction motor ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/18
Inventor 谭国俊刘毅刘战杨波
Owner CHAJNA MAJNING DRAJVS EHND AUTOMEHJSHN KO
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