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Method for acquiring stator and rotor current redundant signals of double-fed fan motor set

A technology for doubly-fed wind turbines and rotor currents, which is applied in the control of generators, motor-generators, and electronically commutated motors, and can solve problems such as increased costs.

Inactive Publication Date: 2012-03-07
CHONGQING UNIV
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Problems solved by technology

[0004] At present, most of the sensors in the doubly-fed wind turbine control system do not have redundant design, and those that implement redundant design also use hardware redundancy to ensure the correctness of sensor output signals, such as low and high-speed shaft rotor speed sensors , but each signal needs two sensors to measure, which will inevitably bring about an increase in cost

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  • Method for acquiring stator and rotor current redundant signals of double-fed fan motor set
  • Method for acquiring stator and rotor current redundant signals of double-fed fan motor set
  • Method for acquiring stator and rotor current redundant signals of double-fed fan motor set

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings.

[0030] Starting from the electromagnetic transient mathematical model of the doubly-fed wind turbine, the stator and rotor current state equations are derived, and the corresponding observer model is established. It is now assumed that the d and q axes are synchronously rotating coordinate axis systems, the d axis leads the q axis by 90°, the positive direction of the voltage and current of the stator and rotor of the doubly-fed wind motor is stipulated in accordance with the motor convention, and the electromagnetic equation of the prototype motor can be used to obtain the comprehensive phasor The voltage equation of the doubly-fed wind generator represented by is:

[0031] U → s = ...

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Abstract

The invention provides a method for acquiring stator and rotor current redundant signals of a double-fed fan motor set. The method comprises the following steps of: acquiring ; constructing a stator current signal and a rotor current signal in a synchronous rotating coordinate system on the basis of a stator and rotor current observer algorithm of a double-fed fan motor according to a stator voltage signal, a rotor voltage signal, a rotor voltage signal and a rotor speed signal obtained by the traditional sensor; and finally, reversely transforming the stator current signal and the rotor current signal back to a static rotating coordinate so as to obtain a redundant stator current signal and a redundant rotor current signal. On one hand, the signals can be used for correcting signals of atrue sensor; on the other hand, the signals can be used for fault diagnosis of corresponding sensors, fault tolerance of the fan motor set and the like. Thus, the invention not only can omit the installation of part of hardware sensors to save cost, but also can reduce the installation space of a measuring device. The invention can effectively avoid a series of problems possibly brought by hardware redundancy design.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a method for obtaining redundant signals of stator and rotor currents of a doubly-fed wind turbine. Background technique [0002] With the increasing single-unit capacity of grid-connected wind turbines in my country, and the planning, construction and operation of large-scale wind farms, especially offshore wind farms, wind turbines will face harsher operating environmental conditions and higher operating and maintenance costs. How to improve and guarantee the operational reliability and safety of wind turbines has become the focus of domestic and foreign engineering and academic circles. The control system of the grid-connected wind turbine is a comprehensive control system, including the main control system of the wind turbine, the converter system, the pitch system, and the remote monitoring system. The wind turbine control system not only needs to monitor the p...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P9/00H02P21/14H02P21/22
Inventor 李辉赵猛赵斌杨超陈宏文
Owner CHONGQING UNIV
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