Maximum power point tracing method of wind generator set

A wind turbine, maximum power point technology, applied to the control of generators, electrical components, control systems, etc., can solve the problems of complex models and difficult implementation, and achieve simple results

Inactive Publication Date: 2008-09-24
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Abstract
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AI Technical Summary

Problems solved by technology

Adaptive control has the advantage of not relying on system parameters and models, and also has good stability, but the model is more complex and difficult to implement

Method used

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  • Maximum power point tracing method of wind generator set
  • Maximum power point tracing method of wind generator set
  • Maximum power point tracing method of wind generator set

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Embodiment Construction

[0016] The relationship between wind turbine output power and speed is as follows: figure 1 As shown, there is a speed at different wind speeds to maximize the output power of the wind turbine, that is, the maximum power point tracking can be achieved when the speed of the blades of the wind turbine is at this specific value. Such as figure 2 As shown, for a certain wind turbine, at a certain wind speed and pitch angle, there is a maximum wind energy conversion coefficient C pmax , the output power of the wind turbine is at its maximum. Therefore, at a certain wind speed, the maximum power point tracking can be achieved by adjusting the blade speed of the wind turbine so that it operates under the condition of the optimal tip speed ratio.

[0017] The present invention first obtains the mechanical output power P of the wind turbine by sampling m and the input power P of the wind turbine w , using the formula C p = ...

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Abstract

The invention relates to a maximum power point tracking method of a wind generating set. The method includes: calculating rotor power coefficient Cp and then calculating a blade top speed ratio Lambda as well as dCp / d Lambda; when dCp / d Lambda is greater than zero, an actual working point is at the left side of a maximum rotor power coefficient point, the blade top speed ratio of a wind turbine is less than the optimal blade top speed ratio, the rotating speed of the blade is increased; when dCp / d Lambda is less than zero, the actual working point is at the right side of the maximum rotor power coefficient point, the blade top speed ratio of the wind turbine is more than the optimal blade top speed ratio, the rotating speed of the blade is reduced; when dCp / d Lambda is equal to zero, the actual working point is at the maximum rotor power coefficient point, the actual blade top speed ratio of the wind turbine is equal to the optimal blade top speed ratio; the wind turbine runs at an optimal state; the optimal rotating speed and the actual rotating speed of the wind turbine is subtracted; the difference value is converted into a control current id<*> by the control of PI current; difference value of the id<*> and the actual current id of the wind generating set is calculated and input into PWM for modulating; simultaneously the difference value of 0 and the actual current iq of the wind generating is input into the PWM for modulating; the modulating result controls a drive circuit to realize the maximum power point tracking.

Description

technical field [0001] The invention relates to a method for tracking a maximum power point of a wind power generating set. Background technique [0002] At present, the proportion of wind power in the grid is increasing. Most of the existing wind turbines operate at a constant speed. The speed of the wind turbine cannot change with the change of the wind speed, and the optimal utilization efficiency of wind energy cannot be achieved. Variable-speed wind turbines are favored by scholars at home and abroad for their advantages of maximally capturing wind energy. Document 1 (D.S.Zinger, E.Muljadi. Annualized wind energy improvement using variable speeds[J], IEEE Trans.on Ind. Appl, 1997, 33: 1444-1447.) proves that the efficiency of the variable speed wind power generation system is 38% higher than that of the constant speed system, and the installed capacity is increasing day by day. Judging from the operating conditions of the variable-speed wind turbines installed and ope...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P9/04
Inventor 李建林赵斌马蕊许洪华
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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