CN105402085A - Method for adjusting controlling parameters of fan and control system using method - Google Patents

Method for adjusting controlling parameters of fan and control system using method Download PDF

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Publication number
CN105402085A
CN105402085A CN201510876252.5A CN201510876252A CN105402085A CN 105402085 A CN105402085 A CN 105402085A CN 201510876252 A CN201510876252 A CN 201510876252A CN 105402085 A CN105402085 A CN 105402085A
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blower fan
generator
speed
fan
controling parameters
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CN105402085B (en
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刘忠朋
肖硕文
纪国瑞
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Guodian United Power Technology Co Ltd
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Guodian United Power Technology Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

Abstract

The invention discloses a method for adjusting controlling parameters of a fan. The method comprises the following steps: (1) providing linear mathematical models of the fan at different wind speeds through fan design data; (2) designing a feedback controller by using revolving speed of a generator as a feedback signal, wherein theta= kep+ k= summa e dt, kp is a proportionality coefficient, ki is an integral coefficient, e is difference between actual revolving speed of the generator and rated speed of the generator, and theta is a variable pitch angle; (3) setting value ranges of kp and ki, and carrying out time domain and frequency domain simulated analysis to obtain all response characteristics of the fan in a control parameter value range at different wind speeds; (4) calculating a correlation function by comparing the response characteristics at the different wind speeds, and combining wind speed fan characteristics with high correlation; and (5) classifying fan states according to a combining result and obtaining a control parameter adjusting method according to response characteristics classified differently. The invention further discloses a control method using the method. The method for adjusting the control parameters of the fan and the control system using the method are based on the mathematical models of the fan, the theoretical basis is reliable, working conditions of the fan are guided in a classified mode, and workload is simplified.

Description

The control system of methods and applications the method for a kind of blower fan adjustment controling parameters
Technical field
The present invention relates to Wind turbines rotating speed control technique field, particularly relate to the control system of methods and applications the method for a kind of blower fan adjustment controling parameters.
Background technique
China's wind resource is very abundant, and the theoretical reserves of explored wind energy are 32.26 hundred million kilowatts, and wind energy belongs to clean green energy resource, therefore obtain the Chinese government and support energetically.The principle of wind-power electricity generation is that the changes mechanical energy of catching in wind becomes electric energy.But because the change of wind speed directly can change the blade rotary speed of Wind turbines, when it changes greatly, when Wind turbines can be caused to carry out rated generation, the power swing of output comparatively greatly, affects the power generating quality of Wind turbines and the safety of blower fan itself.
Therefore, the variable blade control system of wind-power electricity generation is one of core technology of Wind turbines, is also the necessary condition of safe operation of wind turbine.And the experience of designer is depended in the design becoming oar controller parameter usually, adjust when controling parameters regulates especially at the scene simultaneously and lack enough theories.When designer carries out Control System Design, by a large amount of l-G simulation tests, the waste of resource can only be formed; Meanwhile, when designer carries out field adjustable, owing to lacking enough information, easily make controling parameters stability margin not enough, produce potential safety hazard.
As can be seen here, the variable blade control system of above-mentioned existing wind-power electricity generation, in structure, method and use, obviously still has inconvenience and defect, and is urgently further improved.How to found the control system of methods and applications the method for a kind of new blower fan adjustment controling parameters, one of current important research and development problem of real genus.
Summary of the invention
The technical problem to be solved in the present invention is to provide the method for a kind of blower fan based on mathematical model adjustment controling parameters, makes it find out suitable controling parameters adjusting method for different operating mode, thus overcomes the deficiency of the variable blade control system of existing wind-power electricity generation.
For solving the problems of the technologies described above, the method for a kind of blower fan adjustment of the present invention controling parameters, comprises the steps:
(1) by the design data of blower fan, blower fan linear numerical modei under different wind speed is provided;
(2) using generator speed as feedback signal, design of feedback controller, described controller mathematical model is: θ=k pe+k i∫ edt, wherein, k pfor proportional controller coefficient, k ifor integral controller coefficient, e is the difference of actual generator rotating speed and rated generator rotating speed, and θ is for becoming propeller angle;
(3) k is set pwith k ispan, by the simulation analysis of time-domain and frequency-domain, obtain whole response characteristics of blower fan under different wind speed in controling parameters span;
(4) by whole response characteristics of blower fan under more different wind speed, calculate correlation function, the corresponding wind speed fan characteristic of strong correlation is merged;
(5) according to the amalgamation result of step (4), the working state of blower fan is classified, and the response characteristic corresponding according to different operating state draws suitable controling parameters adjusting method.
As a modification of the present invention, in described step (1), under different wind speed, blower fan linear numerical modei formula is:
x · = A x + B u y = C x
Wherein, A is Wind turbines state matrix, and B is the input coefficient matrix of Wind turbines, and C is the output factor matrix of Wind turbines, and x is the state variable of Wind turbines, and y is the output variable of Wind turbines.
Further improvement, described mathematical model formula can be reduced to single-input single-output form, is wherein input as propeller pitch angle, exports as generator speed.
Further improvement, in described step (3), whole response characteristics of blower fan comprise control system rise time, overshoot, stabilization time and magnitude margin.
Further improvement, described step (4) comprising: divide operating mode by the characteristic curve correlation coefficient calculating two adjacent groups wind speed corresponding, described strong correlation refers to that the degree of correlation is greater than 0.7.
The present invention also provides a kind of control system applying above-mentioned blower fan adjustment controling parameters method, comprises generator speed signals collecting mechanism and becomes oar control mechanism,
Described generator speed signals collecting mechanism is connected with the generator of Wind turbines, for gathering the rotary speed data of generator, and the rotary speed data collected is sent to change oar control mechanism;
Described blower fan adjustment controling parameters method applied by described change oar control mechanism, for adjusting suitable controling parameters, and calculates and exports vane propeller-changing angle.
Further improvement, described generator speed signals collecting mechanism comprises photoelectric encoder and rotating speed wave filter, the input end of described photoelectric encoder is connected with described generator, and its output terminal is connected with the input end of rotating speed wave filter, and the output terminal of described rotating speed wave filter is connected with change oar control mechanism.
Further improvement, described change oar control mechanism comprises PI controller, and described PI controller is connected with the output terminal of described rotating speed wave filter.
Adopt above-mentioned technological scheme, the present invention at least has the following advantages:
The method of blower fan adjustment controling parameters of the present invention is the mathematical model set up based on the whole design data of blower fan, has reliable theoretical foundation; But not only depend on mathematical model, by whole response characteristics of blower fan under more different wind speed, fan condition is classified, and controling parameters design guidance is qualitatively carried out to corresponding operating mode, enormously simplify workload during design con-trol parameter, Controller gain variations is carried out to designer and field control parameter adjustment is significant.
Accompanying drawing explanation
Above-mentioned is only the general introduction of technical solution of the present invention, and in order to better understand technological means of the present invention, below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail.
Fig. 1 is the flow chart obtaining system response characteristic curve under different wind speed;
Fig. 2 is the resonse characteristic of low wind speed section blower fan;
Fig. 3 is the resonse characteristic of middle wind speed section blower fan;
Fig. 4 is the resonse characteristic of high wind speed section blower fan.
Embodiment
With reference to shown in accompanying drawing 1, the method for a kind of adjustment of the blower fan based on mathematical model of the present invention controling parameters, comprises the steps:
(1) by the design data that blower fan is whole, the blower fan linear numerical modei under different wind speed is provided;
First, by the design data that blower fan is whole, comprising: the characteristic information in blade, wheel hub, main shaft, tower cylinder, Transmitted chains, cabin, under different wind speed, set up the linear numerical modei of Wind turbines, described by following formula:
x · = A x + B u y = C x
Wherein, A is Wind turbines state matrix, and B is the input coefficient matrix of Wind turbines, and C is the output factor matrix of Wind turbines, and x is the state variable of Wind turbines, and y is the output variable of Wind turbines.And this mathematical model is reduced to the form of single-input single-output, be wherein input as propeller pitch angle, export as generator speed.
(2) using generator speed as feedback signal, design of feedback controller, as added PI controller in the loop, forms closed-loop feedback control loop.Wherein, controller mathematical model is:
θ＝k pe+k i∫edt
Wherein, k pfor proportional controller coefficient, k ifor integral controller coefficient, e is the difference of actual generator rotating speed and rated generator rotating speed, and θ is for becoming propeller angle.
(3) k is set pwith k ispan, by the simulation analysis of time-domain and frequency-domain, obtain whole response characteristics of blower fan under different wind speed in controling parameters span, as control system rise time, overshoot, stabilization time and magnitude margin.
(4) by whole response characteristics of blower fan under more different wind speed, calculate correlation function, the corresponding wind speed fan characteristic of strong correlation is merged.
Operating mode is divided by the characteristic curve correlation coefficient calculating two adjacent groups wind speed corresponding.When the characteristic curve that two groups of wind speed are corresponding is strong correlation, when namely the degree of correlation is greater than 0.7, a kind of operating mode can be merged into.
(5) according to the amalgamation result of step (4), the working state of blower fan is classified, and draw the adjusting method of suitable controling parameters according to response characteristic.
As by aforementioned computational process, Wind turbines operating mode can be divided three classes by wind speed difference, i.e. low wind speed running state, middle wind speed running state and high wind speed running state.Present hypothesis designs or in field adjustable process, finds that blower fan causes hypervelocity fault excessively slowly for the control procedure of rotating speed, needs the dynamic process reducing rotating speed control.If when this fault occurs in low wind speed running state, low wind speed running state as shown in Figure 2.Can see from accompanying drawing 2, increase k pand k ieffectively can reduce the rise time, but increase k ibe easy to cause the excessive dynamic quality affecting control system of overshoot.Therefore, should mainly through increasing k in this operating mode padjust; If when this fault occurs in middle wind speed running state, middle wind speed running state as shown in Figure 3.Can see from accompanying drawing 3, increase k pand k irise time can be reduced.Increase k merely as we can see from the figure pcan extend steady state time, can increase the dynamic process of control system on the contrary, simultaneity factor overshoot and stability margin are to tolerating larger k i, therefore should pass through to increase k by a small margin in this operating mode simultaneously pand k iadjust; If when this fault occurs in high wind speed running state, high wind speed running state as shown in Figure 4.Can see from accompanying drawing 4, increase k pand k irise time can be reduced.But increase k as we can see from the figure pcan steady state time be extended, the dynamic process of control system can be increased on the contrary.Meanwhile, k is increased as we can see from the figure iaffect more weak on the overshoot of control system and stability margin.Therefore, should mainly through increasing k in this operating mode iadjust.To sum up, under different blower fan working staties, the adjusting method of suitable controling parameters can be found out according to the difference of response characteristic, reach the technique effect effectively utilizing wind energy.
The present invention also provides a kind of control system of wind turbines utilizing said method, comprises generator speed signals collecting mechanism and becomes oar control mechanism.Generator speed signals collecting mechanism is connected with the generator of Wind turbines, for gathering the rotary speed data of generator, and the generator speed data collected is sent to change oar control mechanism.
This generator speed signals collecting mechanism comprises photoelectric encoder and rotating speed wave filter, and the input end of photoelectric encoder is connected with generator, and its output terminal is connected with the input end of rotating speed wave filter, and the output terminal of rotating speed wave filter is connected with change oar control mechanism.
Become oar control mechanism and comprise PI controller, it utilizes the method for the above-mentioned adjustment of the blower fan based on mathematical model controling parameters, can instruct the adjustment of controling parameters, finally calculates and export vane propeller-changing angle.
The present invention is by adjusting suitable controling parameters thus effectively utilizing wind energy, this control system of wind turbines is enable effectively to control the motor speed of Wind turbines under different wind speed, and then control the power stage of Wind turbines, improve power generating quality and the safety coefficient of Wind turbines.
The present invention is that the PI Controller gain variations of rotation speed of fan provides theoretical direction, carries out Controller gain variations and field control parameter adjustment is significant to designer.
The present invention is based on the method for the blower fan adjustment controling parameters of mathematical model, the index request corresponding to different fan condition is given by mathematical model, easy to adjust to controling parameters, significantly simplify the workload of designer, important rationale is provided for controling parameters adjustment simultaneously.
The above; it is only preferred embodiment of the present invention; not do any pro forma restriction to the present invention, those skilled in the art utilize the technology contents of above-mentioned announcement to make a little simple modification, equivalent variations or modification, all drop in protection scope of the present invention.

Claims (8)

1. a method for blower fan adjustment controling parameters, is characterized in that, comprise the steps:
(1) by the design data of blower fan, blower fan linear numerical modei under different wind speed is provided;
(2) using generator speed as feedback signal, design of feedback controller, described controller mathematical model is: θ=k pe+k i∫ edt, wherein, k pfor proportional controller coefficient, k ifor integral controller coefficient, e is the difference of actual generator rotating speed and rated generator rotating speed, and θ is for becoming propeller angle;
(3) k is set pwith k ispan, by the simulation analysis of time-domain and frequency-domain, obtain whole response characteristics of blower fan under different wind speed in controling parameters span;
(4) by whole response characteristics of blower fan under more different wind speed, calculate correlation function, the corresponding wind speed fan characteristic of strong correlation is merged;
(5) according to the amalgamation result of step (4), the working state of blower fan is classified, and the response characteristic corresponding according to different operating state draws suitable controling parameters adjusting method.
2. the method for blower fan adjustment controling parameters according to claim 1, it is characterized in that, in described step (1), under different wind speed, blower fan linear numerical modei formula is:
x · = A x + B u y = C x
Wherein, A is Wind turbines state matrix, and B is the input coefficient matrix of Wind turbines, and C is the output factor matrix of Wind turbines, and x is the state variable of Wind turbines, and y is the output variable of Wind turbines.
3. the method for blower fan adjustment controling parameters according to claim 2, it is characterized in that, described mathematical model formula can be reduced to single-input single-output form, is wherein input as propeller pitch angle, exports as generator speed.
4. the method for blower fan adjustment controling parameters according to claim 1, it is characterized in that, in described step (3), whole response characteristics of blower fan comprise control system rise time, overshoot, stabilization time and magnitude margin.
5. the method for blower fan adjustment controling parameters according to claim 1, it is characterized in that, described step (4) comprising: divide operating mode by the characteristic curve correlation coefficient calculating two adjacent groups wind speed corresponding, described strong correlation refers to that the degree of correlation is greater than 0.7.
6. application rights requires a control system for the blower fan adjustment controling parameters method described in 1 to 5 any one, it is characterized in that, comprises generator speed signals collecting mechanism and become oar control mechanism,
Described generator speed signals collecting mechanism is connected with the generator of Wind turbines, for gathering the rotary speed data of generator, and the rotary speed data collected is sent to change oar control mechanism;
Described blower fan adjustment controling parameters method applied by described change oar control mechanism, for adjusting suitable controling parameters, and calculates and exports vane propeller-changing angle.
7. control system according to claim 6, it is characterized in that, described generator speed signals collecting mechanism comprises photoelectric encoder and rotating speed wave filter, the input end of described photoelectric encoder is connected with described generator, its output terminal is connected with the input end of rotating speed wave filter, and the output terminal of described rotating speed wave filter is connected with change oar control mechanism.
8. control system according to claim 7, is characterized in that, described change oar control mechanism comprises PI controller, and described PI controller is connected with the output terminal of described rotating speed wave filter.
CN201510876252.5A 2015-12-03 2015-12-03 A kind of control system of methods and applications this method of wind turbine adjustment control parameter Active CN105402085B (en)

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Publication number Priority date Publication date Assignee Title
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CN102308084A (en) * 2008-12-30 2012-01-04 海文德股份公司 Blade pitch control in a wind turbine installation
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Publication number Priority date Publication date Assignee Title
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