Variable-speed constant-frequency doubly-fed generator system and its parallel network controlling method

A doubly-fed generator, variable-speed constant-frequency technology, applied in the direction of single-grid parallel feeding arrangement, etc., can solve the problems of large grid-connected inrush current and complicated grid-connected control system, reducing capacity, complexity, and ease of use. The effect of grid connection

Inactive Publication Date: 2006-05-10
北京科诺伟业科技股份有限公司 +1
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the disadvantages of the prior art that the grid-connected impact current is large, the motor speed is strictly required when connecting to the grid, and the grid-connected control system is complicated, and to provide a variable-speed constant-frequency doubly-fed generator system and its grid-connected control method, the current adopts open-loop control, and the frequency, amplitude and phase of the stator voltage are simultaneously controlled to realize the smooth grid connection of the doubly-fed generator set

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  • Variable-speed constant-frequency doubly-fed generator system and its parallel network controlling method
  • Variable-speed constant-frequency doubly-fed generator system and its parallel network controlling method
  • Variable-speed constant-frequency doubly-fed generator system and its parallel network controlling method

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[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0029] figure 1 It is a block diagram of the strong current part of the variable-speed constant-frequency wind doubly-fed generator system, figure 2 It is the block diagram of its weak current part. by figure 1 , 2 The grid connection method of the present invention is adopted in the composed system. figure 1 The medium and high power part mainly includes: excitation converter 1, doubly-fed generator 2, driving wind turbine 3, contactor 4. The specific connection method is: the driving wind turbine 3 is connected to the rotating bearing of the doubly-fed motor 2; the rotor excitation terminal of the doubly-fed motor 2 is connected to the excitation converter 1, and the excitation converter 1 adopts a dual-PWM three-phase full-bridge topology , can realize bidirectional flow of energy on the rotor side of the doubly-fed generator; the inpu...

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Abstract

This invention relates to variable speed and constant frequency wind force generating system by use of double feedback sensing motor and its parallel interconnected control method, which comprises double sense motor, exciting transducer, DSP unit, electricity collecting unit, speed, position sense unit and drive unit. The method comprises the following steps: controlling exciting transducer and using it to control double feedback motor rotors to generate voltage; controlling the motor rotor voltage phase, frame and frequency without single simultaneous control on net voltage and rotor voltage; in motor speed range of 0 to 0.5s, the drive unit starting drive exciting transducer with wide rotation speed range and low demands; the control process adopting current open control.

Description

technical field [0001] The invention relates to a wind power generator system and a grid-connected control method thereof, in particular to a variable-speed constant-frequency wind power generator system using a double-fed induction motor as a generator and a grid-connected control method thereof. Background technique [0002] At present, among the main wind power generation technologies in the world, variable speed constant frequency wind power generation technology is the most optimized technology and will become the development direction of wind power generation technology. Variable speed constant frequency doubly-fed generator sets can only send energy to the grid after they have been connected to the grid first. Therefore, the grid connection control of variable speed constant frequency double-fed generators is very important. [0003] In the traditional constant speed and constant frequency power generation method, the output frequency of the generator depends entirely...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/40
Inventor 赵栋利许洪华赵斌李亚西姚红菊李峰潘磊武鑫鄂春良郭金东王志华
Owner 北京科诺伟业科技股份有限公司
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