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Control method for smoothing active power output by variable-speed constant-frequency type wind power generation system

A technology of wind power generation system and active power, which is applied in the direction of control system, control generator, electrical components, etc., and can solve problems such as inability to achieve maximum power tracking

Inactive Publication Date: 2013-03-13
XI AN JIAOTONG UNIV
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  • Application Information

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Problems solved by technology

However, none of these methods can achieve maximum power tracking, and the former is a single power loop control, which requires real-time monitoring of the output power to prevent instability.

Method used

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  • Control method for smoothing active power output by variable-speed constant-frequency type wind power generation system
  • Control method for smoothing active power output by variable-speed constant-frequency type wind power generation system
  • Control method for smoothing active power output by variable-speed constant-frequency type wind power generation system

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Embodiment Construction

[0027] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0028] refer to figure 1 , the traditional variable-speed constant-frequency wind power generation system includes a speed outer loop and a torque inner loop, in which the speed command changes in real time with the wind speed to achieve maximum wind energy tracking, and through real-time detection of wind speed v w The speed command ω can be obtained * To achieve maximum wind energy tracking, the relationship between the two is provided by the wind turbine manufacturer. Speed ​​command ω * The difference from the actual speed ω is sent to the outer loop regulator to obtain the torque command Torque command and actual torque T e After making a difference, it is sent to the inner ring regulator. figure 1 where K is the coefficient of friction, T f is the friction torque.

[0029] When the wind speed changes, the traditional control method will lead to ...

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Abstract

The invention provides a control method for smoothing an active power output by a variable-speed constant-frequency type wind power generation system. The method comprises the following step of: inhibiting and lowering a fluctuation of the active power output by a wind turbine according to the feedforward of a wind torque, wherein during a control process, the only requirement is to estimate the wind torque according to a wind speed and a rotating speed and carry out the feedforward in a control system, so that the smoothing of the active power is realized without adoption of an additional energy storage device. Therefore, an influence of the fluctuation of the power output by a wind field to a power system is reduced. Based on a simulation result, compared with the traditional control method, the control method provided by the invention has the advantage that the attenuation of the fluctuation of the active power is realized well.

Description

【Technical field】 [0001] The invention relates to the research field of new energy (wind power generation), in particular to a control method for smooth output active power of a variable-speed constant-frequency wind power generation system. 【Background technique】 [0002] Since the 1970s, energy and environmental protection have gradually become one of the world's mainstream concerns. With the continuous increase of energy consumption and the continuous reduction of traditional energy sources, the development of new energy sources has attracted widespread attention and promotion from the whole society. Among them, wind power generation has achieved rapid development in recent years because of its large-scale utilization and low cost. The variable-speed constant-frequency wind power generation system has become the mainstream choice in wind power generation systems due to its many advantages such as wide wind speed utilization range, maximum power tracking, and independent c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P9/00
Inventor 刘进军周临原周思展
Owner XI AN JIAOTONG UNIV
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