CN101304173B - Reactive compensation method - Google Patents
Reactive compensation method Download PDFInfo
- Publication number
- CN101304173B CN101304173B CN2008100183647A CN200810018364A CN101304173B CN 101304173 B CN101304173 B CN 101304173B CN 2008100183647 A CN2008100183647 A CN 2008100183647A CN 200810018364 A CN200810018364 A CN 200810018364A CN 101304173 B CN101304173 B CN 101304173B
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- voltage
- gear
- load tap
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The invention discloses a reactive power compensation method. An on-load tap changer is arranged between a high voltage switch and a power capacitor; the input end of the on-load tap changer is connected with the high voltage switch; the output end of the on-load tap changer is connected with the power capacitor; the voltage output of the on-load tap changer is nonlinear; the reactive power output of the power capacitor is linear or approximately linear. The method of the invention is used for setting the voltage output of the on-load tap changer of a transmission system, which leads the reactive compensation capacity of the power capacitor to be output linearly and leads the compensation effect to be more reasonable.
Description
Technical field
The invention belongs to for the power transformation technical field, be specifically related to a kind of method of reactive power compensation, make the reactive power compensation effect obtain very big improvement.
Background technology
Often adopt in the electric power system to connect power capacitor below high-voltage switch gear, by the break-make of control high-voltage switch gear, system is carried out reactive power compensation, the group number of the capacitor that compensates in the system is many more, and effect is good more.And in the Circuits System of transformer station, generally adopt one to two big capacity reactive-load compensation capacitor is configured on two sections power supply buses that can be communicated with, because the capacitance group number is very little, the reactive power compensation effect is undesirable.
Under the discarded condition of the compensation condenser of original system and high-voltage switch gear, the on-load tap-changing transformer of maturation is disposed between the two, the input of on-load tap-changing transformer is connected with high-voltage switch gear, and output is connected with power capacitor.Because therefore square being directly proportional of the reactive capability of capacitor and capacitance voltage can regulate reactive capability by the output voltage of adjusting on-load tap-changing transformer.The output voltage that is used to regulate idle each grade of on-load tap-changing transformer at present is each gear with respect to the descend voltage of a fixed ratio of the most high-grade voltage, and common variation voltage is 5%.
Because the output voltage of on-load tap-changing transformer is linear change, and square being directly proportional of the idle output capacity of capacitor and voltage, i.e. Q=KCU
2So just causing on-load tap-changing transformer is non-linear at the idle output capacity of each gear correspondence, and the gear of on-load tap-changing transformer can not jump to select suitable reactive compensation capacity, cause electric power system can not realize the optimum efficiency of reactive power compensation, and rationally control for the voltage and reactive power compensation controller to have increased difficulty, brought inconvenience to each grade compensation capacity is set simultaneously according to each grade capacity.
Summary of the invention
The method that the purpose of this invention is to provide a kind of reactive power compensation makes the idle of capacitor be output as linearity or approximately linear, thereby has improved the reasonability of reactive power compensation.
The technical solution adopted in the present invention is, a kind of method of reactive power compensation, between high-voltage switch gear and power capacitor, on-load tap-changing transformer is set, the input of on-load tap-changing transformer is connected with high-voltage switch gear, the output of on-load tap-changing transformer is connected with power capacitor, it is non-linear that the voltage of on-load tap-changing transformer is output as, and makes the idle linearity or the approximately linear of being output as of power capacitor specifically to carry out according to the following steps:
Step 1: determine each parameter
According to the compensation requirement, the gear number of contacts of determining the on-load tap-changing transformer output voltage is N;
Current gear positions is X, and the scope of X is 1 to N, and deep low gear is 1, and the most high-grade is N;
Corresponding voltage stepping quantity is N-1;
Determine the rated capacity Qn of the power capacitor that on-load tap-changing transformer is connected and the rated voltage Un of power capacitor according to the compensation requirement;
The voltage allowed band of consideration on-load tap-changing transformer Gear-shift switch is comprehensively determined the voltage U of minimum voltage shelves
1, each gear voltage is followed successively by U from low to high
1, U
2... U
n
The reactive capability of each gear voltage correspondence is followed successively by Q from low to high
1, Q
2... Q
n
Step 2: determine every grade volume change
The most high-grade reactive compensation capacity is exactly the rated capacity Qn of power capacitor,
Rated capacity Q according to the definite on-load voltage regulation capacitor of step 1
n, Q=KCU by formula
2Calculate the reactive capability of corresponding voltage gear, in the formula, Q is the reactive compensation capacity value, and K is a constant, and C is a capacitance, and U is a magnitude of voltage,
When the on-load voltage regulation transformer is in the N shelves, corresponding reactive capability Q
n=KCU
n 2(1)
When the on-load voltage regulation transformer is in any X shelves, corresponding reactive capability Q
x=KCU
x 2(2)
From last 1,2 formulas, can draw Q
x/ Q
n=U
x 2/ U
n 2,
Therefore, the reactive capability Q of any X gear
x=(U
x 2/ U
n 2) Q
n,
Corresponding one grade reactive compensation capacity Q
1=(U
1 2/ U
n 2) Q
n
Then, every grade reactive capability variation delta Q=(Q
n-Q
1)/(N-1);
Step 3: the capacity of determining each gear
Every grade the reactive capability variation delta Q that draws according to step 2, by formula Q
x=Q
n-(N-X) * Δ Q, calculate the capacity of each gear;
Step 4: the voltage of determining each gear
The formula Q that draws according to step 2
x=(U
x 2/ U
n 2) Q
n,, promptly obtain the computing formula U of the voltage of each gear correspondence with this formula distortion and extraction of square root
x=((U
n 2* Q
x)/Q
n)
1/2, determine each gear corresponding voltage value according to this formula, the voltage that each gear of on-load tap-changing transformer is set according to this magnitude of voltage of determining gets final product.
The reactive capability that the invention has the beneficial effects as follows each voltage output gear correspondence is the method design according to idle linearity, has improved the reactive power compensation effect, has reduced the difficulty of idle compensating control in control, reduces the input of each grade reactive capability information.
Embodiment
The present invention is described in detail below in conjunction with specific embodiment.
Between high-voltage switch gear and the power capacitor on-load tap-changing transformer is set, the input of on-load tap-changing transformer is connected with high-voltage switch gear, the output of on-load tap-changing transformer is connected with power capacitor, it is non-linear that the inventive method is output as the voltage of above-mentioned on-load tap-changing transformer, makes the idle linearity or the approximately linear of being output as of capacitor.
The output of on-load tap-changing transformer is connected with capacitor, on-load tap-changing transformer has 3 grades output voltage at least, the inventive method is regulated the reactive capability of each voltage output gear correspondence the reactive compensation capacity of reactive-load compensation capacitor according to the method for idle linearity, voltage output is more reasonable, and is convenient to the automatic control of transformer.
Below with instantiation the present invention is described.
On-load tap-changing transformer is used to compensate rated capacity Q
nThe power capacitor of=1000KVar, rated voltage are 10.5KV, and one grade voltage is 5.25KV, are divided into 9 gears according to customer requirements.
The first step: determine each parameter
The most high-grade reactive compensation capacity Q
n=1000KVar, the gear number of contacts N=9 of on-load tap-changing transformer output voltage, the rated voltage U of capacitor
n=10.5KV, one grade voltage U
1=5.25KV.Setting current gear positions is X, and the scope of X is 1 to N, and deep low gear is 1, and the most high-grade is N, and corresponding voltage stepping quantity is N-1;
Second step: determine every grade of volume change
Corresponding one grade reactive compensation capacity Q
1=(U
1 2/ U
n 2) * Q
n, in above-mentioned numerical value substitution formula, Q
1=(5.252
2/ 10.5
2) * 1000=250KVar,
Every grade volume change amount Δ Q=(Q
n-Q
1)/(N-1)=(1000-250)/(9-1)=93.75KVar,
The 3rd step: the capacity of determining each gear
According to Q
x=Q
n-(N-X) * Δ Q=1000-(9-X) * 93.75, then
Q
9＝Q
n＝1000KVar
Q
8＝1000-(9-8)×93.75＝906.25KVar
Q
7＝1000-(9-7)×93.75＝812.5KVar
Q
6＝1000-(9-6)×93.75＝718.75KVar
Q
5＝1000-(9-5)×93.75＝625.00KVar
Q
4＝1000-(9-4)×93.75＝531.25KVar
Q
3＝1000-(9-3)×93.75＝437.50KVar
Q
2＝1000-(9-2)×93.75＝343.75KVar
Q
1＝250KVar
The 4th step: according to U
x=((U
n 2* Q
x)/Q
n)
1/2, determine each gear correspondent voltage,
U
9＝U
n＝10.5KV
U
8＝(10.5
2×906.25/1000)
1/2＝10.00KV
U
7＝(10.5
2×812.5/1000)
1/2＝9.46KV
U
6＝(10.5
2×718.75/1000)
1/2＝8.90KV
U
5＝(10.5
2×625.00/1000)
1/2＝8.30KV
U
4＝(10.5
2×531.25/1000)
1/2＝7.65V
U
3＝(10.5
2×437.50/1000)
1/2＝6.95KV
U
2＝(10.5
2×343.75/1000)
1/2＝6.16KV
U
1＝5.25KV
The voltage that each gear of transformer is set according to above-mentioned magnitude of voltage gets final product.
Below with correction data effect of the present invention is described.
Table 1 is that capacitance is 4800KVAR, and ceiling voltage is 10.5KV, the data of conventional linear voltage stepping (5%), and table 2 is under the situation identical with voltage with above-mentioned capacitance, adopts the data of the on-load tap-changing transformer output voltage that the inventive method determines.
Table 1
| Gear | Voltage | Capacity | Volume change |
| 9 | 10.50 | 4800 | |
| 8 | 9.95 | 4309 | 491 (8-9 shelves) |
| 7 | 9.40 | 3845 | 464 (7-8 shelves) |
| 6 | 8.85 | 3407 | 438 (6-7 shelves) |
| Gear | Voltage | Capacity | Volume change |
| 5 | 8.30 | 2996 | 411 (5-6 shelves) |
| 4 | 7.74 | 2611 | 385 (4-5 shelves) |
| 3 | 7.19 | 2252 | 358 (3-4 shelves) |
| 2 | 6.64 | 1920 | 332 (2-3 shelves) |
| 1 | 6.09 | 1615 | 306 (1-2 shelves) |
Table 2
| Gear | Voltage | Capacity | Volume change |
| 9 | 10.50 | 4800 | |
| 8 | 9.9957 | 4350 | 450 (8-9 shelves) |
| 7 | 9.4646 | 3900 | 450 (7-8 shelves) |
| 6 | 8.9018 | 3450 | 450 (6-7 shelves) |
| 5 | 8.3009 | 3000 | 450 (5-6 shelves) |
| 4 | 7.6531 | 2550 | 450 (4-5 shelves) |
| 3 | 6.9451 | 2100 | 450 (3-4 shelves) |
| 2 | 6.1562 | 1650 | 450 (2-3 shelves) |
| 1 | 5.25 | 1200 | 450 (1-2 shelves) |
As can be seen from Table 1, prior art voltage is that the volume change that on-load tap-changing transformer is 1～2 grade is 306KVar under the situation of linearity, and 8～9 grades volume change is 491KVAR, and volume change differs 491/306=1.6 doubly.Capacity during 1 grade of transformer input is 1615KVar, accounts for 33.65% of total capacity 4800KVar.
And as can be seen from Table 2, adopt the inventive method, and 1～9 grade of on-load tap-changing transformer, the volume change between adjacent gear is identical, is 450KVAR.Capacity during 1 grade of transformer input is 1200KVar, accounts for 25.00% of total capacity 4800KVar.
The inventive method, be used for on-load tap-changing transformer to the compensation condenser power supply for the power transformation system, the on high-tension side voltage range of on-load tap-changing transformer is from 380V to 220KV, on-load tap-changing transformer is that three-phase transformer or single-phase transformer are all applicable, not only be used for compensating reactive power, also be used for the transforming plant voltage reactive comprehensive compensation system, make capacitor in the method output of each grade according to idle linearity, when avoiding the transformer output voltage linear, it is bigger than normal to cause the reactive capability of capacitor between high tap position to change, and reactive capability changes less than normal between low-grade location; When making compensation control automatically, certain relatively no-power vacancy, low-grade location pressure regulation action frequency increases, and influences equipment life; Because reactive capability does not reach compensation capacity, cause the compensation of in time to transfer the files during high tap position.The inventive method can reduce the action frequency of equipment to greatest extent, in time, rationally regulates compensating reactive power, has improved the reactive power compensation effect, has reduced the difficulty of idle compensating control in control, and has reduced the input of each grade reactive capability information.
Claims (1)
1. the method for a reactive power compensation, between high-voltage switch gear and power capacitor, on-load tap-changing transformer is set, the input of on-load tap-changing transformer is connected with high-voltage switch gear, the output of on-load tap-changing transformer is connected with power capacitor, it is characterized in that, it is non-linear that the voltage of described on-load tap-changing transformer is output as, and makes the idle linearity or the approximately linear of being output as of power capacitor specifically to carry out according to the following steps:
Step 1: determine each parameter
According to the compensation requirement, the gear number of contacts of determining the on-load tap-changing transformer output voltage is N;
Current gear positions is X, and the scope of X is 1 to N, and deep low gear is 1, and the most high-grade is N;
Corresponding voltage stepping quantity is N-1;
Determine the rated capacity Qn of the power capacitor that on-load tap-changing transformer is connected and the rated voltage Un of power capacitor according to the compensation requirement;
The voltage allowed band of consideration on-load tap-changing transformer on load tap changer is comprehensively determined the voltage U of minimum voltage shelves
1, each gear voltage is followed successively by U from low to high
1, U
2... U
n
The reactive capability of each gear voltage correspondence is followed successively by Q from low to high
1, Q
2... Q
n
Step 2: determine every grade volume change
The most high-grade reactive compensation capacity is exactly the rated capacity Qn of power capacitor,
Rated capacity Q according to the definite power capacitor of step 1
n, Q=KCU by formula
2Calculate the reactive capability of corresponding voltage gear, in the formula, Q is the reactive compensation capacity value, and K is a constant, and C is a capacitance, and U is a magnitude of voltage,
When the on-load voltage regulation transformer is in the N shelves, corresponding reactive capability Q
n=KCU
n 2(1)
When the on-load voltage regulation transformer is in any X shelves, corresponding reactive capability Q
x=KCU
x 2(2)
From last 1,2 formulas, can draw Q
x/ Q
n=U
x 2/ U
n 2,
Therefore, the reactive capability Q of any X gear
x=(U
x 2/ U
n 2) Q
n,
Corresponding one grade reactive compensation capacity Q
1=(U
1 2/ U
n 2) Q
n
Then, every grade reactive capability variation delta Q=(Q
n-Q
1)/(N-1);
Step 3: the capacity of determining each gear
Every grade the reactive capability variation delta Q that draws according to step 2, by formula Q
x=Q
n-(N-X) * Δ Q, calculate the capacity of each gear;
Step 4: the voltage of determining each gear
The formula Q that draws according to step 2
x=(U
x 2/ U
n 2) Q
n,, promptly obtain the computing formula U of the voltage of each gear correspondence with this formula distortion and extraction of square root
x=((U
n 2* Q
x)/Q
n)
1/2, determine each gear corresponding voltage value according to this formula, the voltage that each gear of on-load tap-changing transformer is set according to this magnitude of voltage of determining gets final product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100183647A CN101304173B (en) | 2008-06-03 | 2008-06-03 | Reactive compensation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100183647A CN101304173B (en) | 2008-06-03 | 2008-06-03 | Reactive compensation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101304173A CN101304173A (en) | 2008-11-12 |
| CN101304173B true CN101304173B (en) | 2010-06-16 |
Family
ID=40113936
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100183647A Expired - Fee Related CN101304173B (en) | 2008-06-03 | 2008-06-03 | Reactive compensation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103457270B (en) * | 2012-05-31 | 2017-12-12 | 黄留欣 | Transformer concentrates dynamic reactive compensation device |
| CN103777535B (en) * | 2014-01-23 | 2016-12-07 | 无锡北科自动化科技有限公司 | Mineral hot furnace load Intellectualized energy-saving control system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2783600Y (en) * | 2005-03-20 | 2006-05-24 | 张宗有 | Reactive compensation device for automatic integrated electric power system |
| CN101075744A (en) * | 2007-06-19 | 2007-11-21 | 保定学峰实业有限公司 | Method for optimizing and allocating capacitor of reactive compensator |
-
2008
- 2008-06-03 CN CN2008100183647A patent/CN101304173B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2783600Y (en) * | 2005-03-20 | 2006-05-24 | 张宗有 | Reactive compensation device for automatic integrated electric power system |
| CN101075744A (en) * | 2007-06-19 | 2007-11-21 | 保定学峰实业有限公司 | Method for optimizing and allocating capacitor of reactive compensator |
Non-Patent Citations (2)
| Title |
|---|
| 李民族等.晶闸管串联调压电容无功补偿装置的研究.电力系统及其自动化学报12 5.2000,12(5),45-50. |
| 李民族等.晶闸管串联调压电容无功补偿装置的研究.电力系统及其自动化学报12 5.2000,12(5),45-50. * |
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|---|---|
| CN101304173A (en) | 2008-11-12 |
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Granted publication date: 20100616 Termination date: 20160603 |