Method for cooperatively controlling active power of wind farm

A technology of active power and coordinated control, which is applied in wind power generation, control system, control generator, etc., and can solve the problems of power fluctuation of wind turbines

Active Publication Date: 2012-09-26
XUJI GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the wind turbines in domestic wind farms are in a state of "free operation". The control principle is to maximize the utilization of wind energy. The power output of wind turbines also fluctuates greatly

Method used

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  • Method for cooperatively controlling active power of wind farm
  • Method for cooperatively controlling active power of wind farm
  • Method for cooperatively controlling active power of wind farm

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0027] The principle block diagram of the control system of the present invention is as figure 1 As shown, the SCADA system of the wind farm substation receives a load command from the dispatcher, and the load command is issued by the dispatcher based on the long-term forecast (annual measurement) of the wind farm and the load in this period. The dispatch instruction is generally within the range of 30%-60% of the wind energy forecast (monthly measurement) of the wind farm. The SCADA system of the substation sends instructions to the wind farm coordination control system, and the wind farm coordination control system is in different positions (wind turbines The position refers to the range delineated by the iso-wind energy line) and the wind turbines respectively issue adjustment instructions.

[0028] combine figure 2 , image 3 Illustrate the coordinated control method of wind farm active power of the present invention, the steps are as follows:

[0029] (1) Measure the...

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Abstract

The invention relates to a method for cooperatively controlling active power of a wind farm, comprising the following steps of: obtaining an excess value of active power fluctuation and taking the excess value and a power excess trend as the input and output excess deviation values of a logic controller; then taking the difference between the excess value and a power frequency deviation value as the input of a PI controller; and finally outputting an active reference value of a motor of a wind farm. In the method, the maximum wind power utilization of a single machine is unlinked by utilizinga control method and inserted into the integral cooperative control of the wind farm, so that the wind turbine has an adjustable allowance, and load fluctuation of a power grid caused by unstable wine energy is balanced to the greatest extent; the balancing can release more space of the power grid, and the effective load transmitting capability is improved. Because active power modulation calculation is based on wind energy prediction, the self protection of the wind turbine is changed from a passive propeller regulation or splitting type into an active prevention type, the operation efficiency of the wind turbine is effectively improved, the impact of the power grid is reduced, and the operation of the wind turbine is protected.

Description

technical field [0001] The invention relates to a coordinated control method for active power of a wind farm, and belongs to the technical field of grid-connected control of wind farms. Background technique [0002] The impact of the wind farm on the system frequency depends on the short-circuit capacity ratio of the wind farm, that is, the ratio of the rated capacity of the wind farm to the short-circuit capacity of the connection point between the wind farm and the power system. When the short circuit is relatively large, the random fluctuation of active power output by the wind farm will have a significant impact on the grid frequency. At present, the wind turbines in domestic wind farms are in a state of "free operation". The control principle is to maximize the utilization of wind energy. The fluctuation of the power output of wind turbines is also very large. The access system of large-scale wind farms, especially the regional power grid, will have a serious impact o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02P9/00
CPCY02E10/763Y02E10/76
Inventor 雷宪章吕志来陆一川吴晓明曹辰薛飞卢润东王炯朱颖张聪
Owner XUJI GRP
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