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Method for detecting initial position of rotor of wind turbine system

A technology for the initial position of the rotor and the wind power generation system, which is applied in the control system, control generator, vector control system, etc., can solve the problems of starting failure, large deviation, and reduced load capacity.

Inactive Publication Date: 2014-04-16
SOUTHEAST UNIV
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Problems solved by technology

[0004] Purpose of the invention: In order to overcome the large deviation between the detected value of the initial position of the rotor and the actual value in the prior art, the load capacity of the motor will decrease or even fail to start when the motor starts, the present invention provides an initial position detection of the rotor of a wind power generation system Method, by applying high-frequency line voltage pulses to the inverter, and detecting the peak value of the corresponding line current, and then using SVPWM technology to determine the rotor initial position detection method of the magnetic pole direction

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  • Method for detecting initial position of rotor of wind turbine system
  • Method for detecting initial position of rotor of wind turbine system
  • Method for detecting initial position of rotor of wind turbine system

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the accompanying drawings.

[0032] like figure 1 , figure 2 Shown is a method for detecting the initial rotor position of a wind power generation system, which includes first detecting the peak value of the line current, and then preliminary determining the initial position of the rotor according to the peak value of the line current, and judging the polarity of the rotor magnetic pole. Specifically, it includes the following steps:

[0033] (1) The peak value of the line current is detected by applying a specified voltage trigger pulse to the inverter. Specifically, the control method of two-to-two conduction of the inverter is used to detect the ab phase line current i ab , ac phase line current i ac and bc phase line current i bc , that is, the motor has two phases conducting at each moment, and the non-conducting phase is suspended, such as image 3 As shown, taking phase a as an example...

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Abstract

The invention discloses a method for detecting the initial position of a rotor of a wind turbine system. The method comprises the steps that firstly, the line current peak value is detected and according to the line current peak value, the initial position of the rotor is initially determined, and the polarity of a rotor magnetic pole is judged. According to the method for detecting the initial position of the rotor of the wind turbine system, the initial position of the rotor of a motor of a wind driven generator can be quietly accurately detected and the motor can be smoothly started; the implementation process is simple, any motor parameter is not needed, the measurement result is accurate, and the engineering practical value is quite high.

Description

technical field [0001] The invention relates to a rotor initial position detection method of a wind power generation system, which applies a high-frequency line voltage pulse to an inverter, detects the corresponding line current peak value, and then uses SVPMW technology to determine the rotor initial position detection method of the magnetic pole direction. Background technique [0002] At present, in wind power generation systems with various structures, the scheme of permanent magnet synchronous generator (PMSG) has high efficiency and has the advantages of no need for excitation circuit, etc., and has an important position. Especially in small wind power generation systems, PMSG has been more applied due to these advantages. Whether the initial position of the rotor can be accurately estimated is a prerequisite for the high-performance control strategy (vector control or direct torque) of the permanent magnet synchronous generator and the realization of position sensorl...

Claims

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Application Information

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IPC IPC(8): H02P21/14
Inventor 余海涛孟高军胡敏强黄磊
Owner SOUTHEAST UNIV
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