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Megawatt grade wind generator set speed change and distance change control system

A technology for wind turbines and control systems, applied in control systems, DC motor speed/torque control, wind turbine control, etc. The effect of reducing the impulse, improving the power generation efficiency, and enhancing the protection function

Inactive Publication Date: 2003-04-16
SHENYANG POLYTECHNIC UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0002] At present, there are mainly two types of grid-connected wind turbines in my country, one is a fixed-pitch stall-type wind turbine; the other is a variable-pitch wind turbine, and both models have developed 600KW prototypes. However, The first type has the disadvantage of low wind capture efficiency. Although the second type has higher wind capture efficiency than the first type, the strong gust impact of the unit makes the wind wheel, transmission system, and hub of the unit Components such as main shaft, gearbox and generator are subjected to strong uneven impact and vibration, so the service life is greatly reduced

Method used

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  • Megawatt grade wind generator set speed change and distance change control system
  • Megawatt grade wind generator set speed change and distance change control system
  • Megawatt grade wind generator set speed change and distance change control system

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Embodiment Construction

[0033] How this system works:

[0034] The principle of variable speed and variable distance control is as follows: Figure 7 As shown in the block diagram of the control principle, the system control takes tracking the change of wind speed as the adjustment quantity, and takes the optimization of the wind rotor speed, output power and system safe and stable operation as the control objectives, forming three main lines of control system adjustment: (1) The wind rotor Speed ​​optimization control is the goal, and a closed-loop control link is formed: the target speed is given by the intelligent module, and is subtracted from the actual speed, and the deviation value enters the box Figure 5 - Block diagram 9-block diagram 11 carries out the coordinate transformation 17 of vector control, and then enters the slip excitation Irq current closed-loop adjustment, and the regulator 5 performs proportional differential adjustment on the excitation current signal Irq, and the signal ou...

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Abstract

The structure of the system includes three parts: the control part, the detection part and the drive part. The control part consists of three parts: the main controller i.e. the operation controller,the distance change control and the speed change controller. The detection part includes the wind wheel rotor, the stator of double fed generator, the variable frequency power supply of speed drop excitation and the invention power source of pulse-width modulation etc. assembled sensors. The drive part is composed of the servomotors with different functions. The sensed signals are output from thedetection part. The control signals output from the interlinkage drive module controls harmonious operation. The invention provides the features of simple structure, stable and reliable running and flexible control.

Description

Technical field [0001] The invention relates to a wind power generation control system, which is suitable for use in variable speed and pitch control of megawatt-level wind turbines. Background technique [0002] At present, there are mainly two types of grid-connected wind turbines in my country, one is a fixed-pitch stall-type wind turbine; the other is a variable-pitch wind turbine, and both models have developed 600KW prototypes. However, The first type has the disadvantage of low wind capture efficiency. Although the second type has higher wind capture efficiency than the first type, the strong gust impact of the unit makes the wind wheel, transmission system, and hub of the unit Components such as main shaft, gearbox and generator are subject to strong uneven impact and vibration, so the service life is greatly reduced. Contents of the invention [0003] In order to realize variable speed and constant frequency control of wind power generators, the object of the prese...

Claims

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Application Information

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IPC IPC(8): F03D7/00H02K7/06
CPCY02E10/723Y02E10/725Y02E10/72
Inventor 邓英姚兴佳
Owner SHENYANG POLYTECHNIC UNIV
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