A method for on-line parameter identification of doubly fed machine

Abstract

A method for on-line parameter identification of doubly-fed machine features that base on multi-innovation identification theory and random gradient identification method and adding variable forgetting factor, that parameter identification method of doubly-fed machine based on variable forgetting factor and multi-innovation random gradient method is use to identify parameters of doubly-fed machine. Considering the nonlinear strong coupling of doubly-fed machine, the stator flux-oriented vector control technology is used to build the vector control system of doubly-fed machine to collect data,and the standard form of motor parameter identification model in dq coordinate system is deduced, and the motor inductance and resistance parameters are calculated iteratively according to the method.The method is applicable to doubly-fed machine in both electric and electric states, and can identify the stator parameters of the machine on-line, improve the accuracy of the control model and improve the control performance.

Description

technical field [0001] The invention relates to an on-line identification method for parameters of a doubly-fed motor, which is especially suitable for a doubly-fed motor of a wind power generation system, and belongs to the technical field of motor control. Background technique [0002] The doubly-fed motor is a new type of motor. In a specific occasion, a smaller-capacity frequency converter can be used to control a larger-capacity speed control system. It has a wide range of speed regulation, can operate in various states, and can realize the adjustment of the stator power factor. In addition, because wind power generation has the characteristics of variable speed and large randomness, and double-fed motor can realize variable speed and constant frequency operation, it is widely used in the field of wind power generation. [0003] Among the control methods of doubly-fed motors, the vector control method is more mature. The vector control model has two closed-loop loops, ...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems that the off-line identification parameter identification method is not easy to use during the actual operation of the double-fed motor, and the existing online identification method has a large amount of calculation, and the design and control process are complicated. For example, the least square method identification needs to calculate the covariance Matrix, etc., propose an online identification method for doubly-fed motor parameters

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