CN103306902B - Smooth output method for power output value of wind power generation device - Google Patents
Smooth output method for power output value of wind power generation device Download PDFInfo
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- CN103306902B CN103306902B CN201310200146.6A CN201310200146A CN103306902B CN 103306902 B CN103306902 B CN 103306902B CN 201310200146 A CN201310200146 A CN 201310200146A CN 103306902 B CN103306902 B CN 103306902B
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- power output
- electric power
- output
- lower limit
- output values
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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
-
- 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
- Y02E10/76—Power conversion electric or electronic aspects
Abstract
The invention discloses a smooth output method for a power output value of a wind power generation device. The method comprises the following steps: presetting a lower limit value of a field power output value in a master controller; detecting the actual field power output value; comparing the actual field power output value and the lower limit value, if the first is smaller than the latter, calculating the ratio R of the difference value of the two values to the power output value, and increasing the output values of all power output devices respectively by the ratio number. According to the invention, the output power of the output values of all power output devices are respectively increased according to the ratio of the difference value of the actual output value and the lower limit value to the power output value, and power generation coefficients are set on each power output device so as to reduce the influence of unstable factors under the condition of ensuring integral output power.
Description
Technical field
The present invention relates to wind power generation field, especially, relate to a kind of stable output method of wind power generation plant power output values.
Background technology
In wind power station, the device using permanent magnetism synchronous wind generating system to be transformed to electric power as wind energy more.But permanent magnetism synchronous wind generating system is strongly non-linear system, the wind speed range of work is wide, uncertain factor is many, and operating efficiency constantly changes with wind speed, directly has influence on the degree of stability of whole field of electric force output valve.
If the power output of each permanent magnetism synchronous wind generating system is reduced, can the output valve of stationary field electric power to a certain extent, but the power of whole field of electric force can be reduced.Therefore, how averaging out in stable output valve and improving between power, is urgent need to solve the problem in the industry.
Summary of the invention
The object of the invention is the stable output method providing a kind of wind power generation plant power output values, to solve the technical problem of field of electric force output valve instability.
For achieving the above object, the invention provides a kind of stable output method of wind power generation plant power output values, comprise step:
A, in master controller the lower limit of preset field power output values;
B, checkout area electric power real output value P
sum,
P
sum=k
1P
1+k
2P
2+……+k
nP
n
Wherein, P is each electric power output apparatus real output value, and k is each electric power output apparatus generating coefficient, and n is the number of electric power output apparatus;
C, lower limit than competiting place electric power real output value and field power output values;
If D field electric power real output value is less than the lower limit of a power output values, the proportional numbers R of the lower limit of power output values shared by both calculating difference, improves this proportional numbers respectively by each electric power output apparatus output valve, thus makes
P
sum=（k
1+R）P
1+（k
2+R）P
2+……+（k
n+R）P
n。
Preferably, also comprise in step D, if field electric power real output value is less than the lower limit of a power output values, improve blade rotational speed.
Preferably, in step D, k
nthe maximum of+R is 0.95.
Preferably, also step e is comprised:
The lower limit of preset each electric power output apparatus output valve in master controller;
As the P obtained in step D
sumwhen being less than the lower limit of a power output values, each electric power output apparatus is sorted from big to small according to real output value, the lower limit of the electric power output apparatus output valve of 10-30% before sequence is improved 15-35% respectively.
Preferably, also comprise: in steps A, the higher limit of preset field power output values in master controller, the higher limit of described field power output values is 0.8-0.98 times of each electric power output apparatus nominal output values summation.
Preferably, also comprise, every a fixed cycle, repeat step C.
Preferably, the described fixed cycle is 10-100s.
The present invention has following beneficial effect: first the present invention limits the lower limit of a power output values, then prescribe a time limit under real output value is less than a power output values, calculate the difference ratio of real output value and lower limit, again the output valve of each electric power output apparatus is improved according to this ratio respectively, thus make real output value be not less than lower limit.
Simultaneously, for each electric power output apparatus is provided with separately generating coefficient, namely the size of the shared total output valve of output valve of each electric power output apparatus is defined, then suitably the generating coefficient of electric power output apparatus larger for fluctuation can be turned down, thus reduce the influence degree of destabilizing factor in whole field of electric force output valve.
Except object described above, feature and advantage, the present invention also has other object, feature and advantage.Below with reference to figure, the present invention is further detailed explanation.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the schematic flow sheet of the preferred embodiment of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiments of the invention are described in detail, but the multitude of different ways that the present invention can limit according to claim and cover is implemented.
See Fig. 1, a kind of stable output method of wind power generation plant power output values, comprises step:
A, in master controller the lower limit of preset field power output values, to limit the minimum operation load of an electric power.
The higher limit of master controller also install beforehand field power output values, the higher limit of described field power output values be the 0.8-0.98 of each electric power output apparatus nominal output values summation doubly, to limit the peak load of each electric power output apparatus, protect its service life.
B, checkout area electric power real output value P
sum,
P
sum=k
1P
1+k
2P
2+……+k
nP
n
Wherein, P is each electric power output apparatus real output value, and k is each electric power output apparatus generating coefficient, and n is electric power output apparatus number; Namely described field electric power real output value is the summation of each electric power output apparatus real output value and its generating coefficient product.
K is the generating coefficient for each electric power output apparatus is arranged separately, define the size of the shared total output valve of output valve of each electric power output apparatus, then can suitably generating coefficient field being exported to the larger electric power output apparatus of total value impact be turned down, such as when the environmental change of a part of electric power output apparatus periphery causes its output valve to fluctuate larger, the electric power output apparatus of this part generating coefficient is reduced.
C, lower limit than competiting place electric power real output value and field power output values;
This comparison step every a fixed cycle, can repeat; With Real-Time Monitoring field power fluctuation situation, and adjust at any time.Fixed cycle can be 10-100s.
If D field electric power real output value is less than the lower limit of a power output values, the proportional numbers R of the lower limit of power output values shared by both calculating difference, improves this proportional numbers respectively by each electric power output apparatus output valve, namely
P
sum=（k
1+R）P
1+（k
2+R）P
2+……+（k
n+R）P
n。
Concrete performance can see embodiment one.
Embodiment one,
Certain field of electric force comprises 1-10 electric power output apparatus, and the lower limit of each electric power output apparatus output valve is 80,000 volts, and its generating coefficient is respectively 0.8-0.9; The lower limit of field power output values is 690,000 volts.
Checkout area electric power real output value:
P
sum=0.84*8+0.8*8+0.81*8+0.81*8+0.80*8+0.82*8
+0.81*8+0.80*8+0.81*8+0.85*8
=8.15*8
=65.2
And electric power exports the lower limit 690,000 volts that actual value 65.2 ten thousand volts is less than a power output values; Therefore, need to regulate further.
Calculate the proportional numbers R that both differences account for the lower limit of power output values;
R=（69-65.2）/69=0.055
Again each electric power output apparatus output valve is improved R respectively, namely
P
sum=（0.84+0.055）*8+（0.8+0.055）*8+（0.81+0.055）*8
+（0.81+0.055）*8+（0.8+0.055）*8
+（0.82+0.055）*8+（0.81+0.055）*8
+（0.8+0.055）*8+（0.81+0.055）*8+（0.85+0.055）*8
=（8.15+0.55）*8=8.7*8
=69.6
Field power output values then after adjustment reaches the lower limit of a power output values, realizes goal of the invention.
In addition, in step D, if field electric power real output value is less than the lower limit of a power output values, by improving electric power output apparatus blade rotational speed, namely improve the output valve of single electric power output apparatus, then contribute to improving the overall output valve of field electric power.
In step D, k
nthe maximum of+R is 0.95, and namely the maximum output valve of single electric power output apparatus is 95% of its rated power, makes it be unlikely to work excess load and affect equipment life.
The inventive method also can comprise step e:
As the P obtained in step D
sumwhen being less than the lower limit of a power output values, each electric power output apparatus is sorted from big to small according to real output value, the electric power output apparatus output valve of sequence front 10% is improved 0.5R respectively again.
Embodiment two,
Certain field of electric force comprises 1-10 electric power output apparatus, and the lower limit of each electric power output apparatus output valve is 70,000 volts, and its generating coefficient is respectively 0.8-0.9; The lower limit of field power output values is 690,000 volts.
Checkout area electric power real output value:
P
sum=0.84*7+0.8*7+0.81*7+0.81*7+0.80*7+0.82*7
+0.81*7+0.80*7+0.81*7+0.85*7
=8.15*7
=57.05
Electric power exports the lower limit 690,000 volts that actual value 57.05 ten thousand volts is less than a power output values; Calculate the ratio R that both differences account for the lower limit of power output values:
R=（69-57.05）/69=0.173
Again each electric power output apparatus output valve is improved R respectively, namely
P
sum=（0.84+0.173）*7+（0.8+0.173）*7+（0.81+0.173）*7
+（0.81+0.173）*7+（0.8+0.173）*7
+（0.82+0.173）*7+（0.81+0.173）*7
+（0.8+0.173）*7+（0.81+0.173）*7+（0.85+0.173）*7
=（8.15+1.73）*7=9.5*7
=66.5
In fact, after each electric power output apparatus output valve improves 17.3% respectively, the generating coefficient of some electrical power output device reaches 0.97-0.98, beyond 0.95 of system specialization; Therefore, can only adjust according to the highest setting ratio 0.95 of system, the real output value of electric power of must showing up is 66.5 ten thousand volts, does not reach the lower limit 690,000 volts of a power output values yet.
Therefore, each electric power output apparatus then sorts according to real output value by from big to small, and what come front three is that real output value is respectively 1,6, No. 10 device, then the preset bottoming value of this three table apparatus is improved 30% respectively; Then
P
sum=（0.84+0.173）*9.1+（0.8+0.173）*7+（0.81+0.173）*7
+（0.81+0.173）*7+（0.8+0.173）*7
+（0.82+0.173）*9.1+（0.81+0.173）*7
+（0.8+0.173）*7+（0.81+0.173）*7+（0.85+0.173）*9.1
=（0.95*7）*7+（0.95*3）*9.1=6.65*7+2.85*9.1
=46.55+25.935
=72.485
Field power output values then after adjustment reaches the lower limit 690,000 volts of a power output values, realizes goal of the invention.
Obviously, according to actual conditions, real output value sequence can be improved 15-35% respectively in the lower limit of the electric power output apparatus output valve of front 10-30%, not affect realization of the present invention.
Such as, real output value sequence in embodiment two is improved 20% respectively in the bottoming value of 1, No. 10 device of front two, then
P
sum=（0.84+0.173）*8.4+（0.8+0.173）*7+（0.81+0.173）*7
+（0.81+0.173）*7+（0.8+0.173）*7
+（0.82+0.173）*7+（0.81+0.173）*7
+（0.8+0.173）*7+（0.81+0.173）*7+（0.85+0.173）*8.4
=（0.95*8）*7+（0.95*2）*8.4=7.6*7+1.9*8.4
=53.2+15.96
=69.16
Make the field power output values after adjusting reach the lower limit 690,000 volts of a power output values equally, realize goal of the invention.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a stable output method for wind power generation plant power output values, is characterized in that, comprises step:
A, in master controller the lower limit of preset field power output values;
B, checkout area electric power real output value P
sum,
P
sum＝k
1P
1+k
2P
2+……+k
nP
n
Wherein, P is each electric power output apparatus real output value, and k is each electric power output apparatus generating coefficient, and n is the number of electric power output apparatus;
C, lower limit than competiting place electric power real output value and field power output values;
If D field electric power real output value is less than the lower limit of a power output values, the proportional numbers R of the lower limit of power output values shared by both calculating difference, improves this proportional numbers respectively by each electric power output apparatus output valve, thus makes
P
sum＝(k
1+R)P
1+(k
2+R)P
2+……+(k
n+R)P
n；
E, in master controller the lower limit of preset each electric power output apparatus output valve;
As the P obtained in step D
sumwhen being less than the lower limit of a power output values, each electric power output apparatus is sorted from big to small according to real output value, the lower limit of the electric power output apparatus output valve of 10-30% before sequence is improved 15-35% respectively.
2. the stable output method of a kind of wind power generation plant power output values according to claim 1, is characterized in that, also comprise in step D, if field electric power real output value is less than the lower limit of a power output values, improves blade rotational speed.
3. the stable output method of a kind of wind power generation plant power output values according to claim 1, is characterized in that, in step D, and k
nthe maximum of+R is 0.95.
4. the stable output method of a kind of wind power generation plant power output values according to claim 1, it is characterized in that, also comprise: in steps A, the higher limit of preset field power output values in master controller, the higher limit of described field power output values is 0.8-0.98 times of each electric power output apparatus nominal output values summation.
5. the stable output method of a kind of wind power generation plant power output values according to claim 1, is characterized in that, also comprise, and every a fixed cycle, repeats step C.
6. the stable output method of a kind of wind power generation plant power output values according to claim 5, is characterized in that, the described fixed cycle is 10-100s.
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| CN103306902B true CN103306902B (en) | 2015-03-25 |
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| CN100578911C (en) * | 2008-04-07 | 2010-01-06 | 国网南京自动化研究院 | Electric voltage idle-work fast control method of speed-changing constant frequency wind generator group wind power station |
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