CN107122920A - A kind of transformer increase-volume scheme Economic Analysis Method - Google Patents
A kind of transformer increase-volume scheme Economic Analysis Method Download PDFInfo
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- 238000004458 analytical method Methods 0.000 title claims abstract description 15
- 230000005611 electricity Effects 0.000 claims description 25
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- 238000012360 testing method Methods 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 238000012423 maintenance Methods 0.000 claims description 9
- 230000036541 health Effects 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
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- DSCFFEYYQKSRSV-KLJZZCKASA-N D-pinitol Chemical compound CO[C@@H]1[C@@H](O)[C@@H](O)[C@H](O)[C@H](O)[C@H]1O DSCFFEYYQKSRSV-KLJZZCKASA-N 0.000 description 1
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Abstract
The invention discloses a kind of transformer increase-volume scheme Economic Analysis Method, consider every income and loss that transformer increase-volume operation is brought, judge the economy of transformer increase-volume operating scheme.This Economic Analysis Method is in terms of income, it is contemplated that the generating profit of transformer, in terms of loss, it is contemplated that impedance loss cost, overhaul of the equipments probability cost and power failure Default Probability cost.
Description
Technical field
The invention belongs to power system device economic evaluation technical field, and in particular to a kind of transformer increase-volume scheme warp
Ji property evaluation method.
Background technology
Among power transmission and transformation system, power transformer is the core that Key Asset is changed with electric energy.In recent years, China is defeated becomes
The construction of electric system is continued to develop, and high-power transformer keeps higher annual growth to continue to develop, but need for electricity is continuous
Increase causes transformer to keep high usage still significant.In general, transformer has the specified of nameplate sign
Capacity, that is, consider the capacity that transformer load ability is formulated.But among Operation of Electric Systems process, due to some equipment hair
Raw failure needs to carry out load transfer, or in view of economy, it is necessary to which transformer carries out the overlond running of short time, Huo Chengchao
Carry, increase-volume is run.
Existing patent is based only upon security to consider the increase-volume scheme of transformer mostly.Such as Publication No. CN102879696B
Chinese patent kind Automatic judgment method for over-load operational feasibility of transformer.Increase-volume load factor is constrained by hot(test)-spot temperature, but
Transformer increase-volume scheme reasonability is not judged from economy point.
Some scholars consideration side economy establishes transformer load property appraisal procedure, it is considered to electricity price income, is damaged by impedance
The transformer life caused by ageing equipment of becoming estranged is lost.But the method does not consider the fault rate rise brought by increase-volume, may
The higher power failure risk caused.Under power-off condition, will there are the cost of overhaul and penalty cost.On the other hand, in scheme to by
The transformer life loss that ageing equipment is caused considers, in practice and unreasonable in engineering.Generally, transformer fault is simultaneously
Whole equipment is not resulted in be replaced, but by making it put into operation again after maintenance.Maintenance process is equivalent to extending change
The theoretical rated life time of depressor.Therefore the loss for assessing transformer with the product of life loss and transformer total value can make estimation
Amount is bigger than normal.
The content of the invention
To the above-mentioned technical problem present in prior art, commented the invention provides a kind of transformer increase-volume scheme economy
Valency method, this method integrates transformer increase-volume generating profit, overhaul of the equipments cost, increase-volume impedance loss and power failure default loss
Four aspects, assess the economy of transformer increase-volume scheme, increase-volume foundation are provided for policymaker.
In order to achieve the above object, the technical solution adopted in the present invention is as follows：A kind of transformer increase-volume scheme economy
Evaluation method, comprises the following steps：
(1) environment temperature and transformer parameter in transformer station high-voltage side bus place are obtained, wherein, transformer parameter, which includes cooling, joins
Number and economic parameters, the cooling parameter of transformer are determined that economic parameters is specified comprising transformer by transformer model, the type of cooling
Capacity, power factor, open circuit loss, load loss, local rate for incorporation into the power network, local sales rate of electricity, transformer cost, repair into
Originally, penalty cost.
(2) desired increase-volume load factor and increase-volume time are inputted；
(3) according to the increase-volume load factor of input, increase-volume time and transformer parameter, calculate after increase-volume in transformer
The temperature of winding most thermal region, i.e. hot(test)-spot temperature；
(4) according to resulting hot(test)-spot temperature, the equipment failure rate in time period is calculated；
(5) according to increase-volume load factor, increase-volume time, the rated capacity of transformer and power factor parameter, local online electricity
Valency and sales rate of electricity, calculating obtain the generating profit that increase-volume in time period is brought；
(6) according to increase-volume load factor, the increase-volume time, transformer noload losses and short circuit loss parameter calculate time period
Interior equipment increase-volume impedance loss cost；
(7) used according to equipment failure rate and the cost of overhaul, computing device maintenance probability cost；
(8) according to equipment failure rate and power failure promise breaking expense, power failure Default Probability cost is calculated；Power failure promise breaking expense is to stop
Electric-examination repaiies period to the penalty cost summation paid needed for user.
(9) comprehensive transformer generating profit, impedance loss cost, overhaul of the equipments probability cost and power failure Default Probability into
This, obtains the mixed economy income under this increase-volume scheme.
Further, in the step (3), using GB/T15164-1994《Oil-immersed power transformer loads directive/guide》
The method of middle offer, according to load factor, current environmental temperature and increase-volume duration, calculates the equipment hot(test)-spot temperature after increase-volume
θh。
Further, in the step (4), using improved continuous AWH models, hot(test)-spot temperature θ is passed throughhCan computing device
Fault rate λ：
Wherein, β, m are to be fitted obtained parameter by historical data；TeqFor the equivalent run time of transformer.L0To become
Depressor rated life time, HI is equipment health index.
Further, in the step (5), generating profit R：
R=K (Pout-Pin)·Sn·t·cosθ
Wherein, PinFor unit electricity rate for incorporation into the power network, PoutFor unit electricity sales rate of electricity, SnFor transformer rated capacity, t
For the increase-volume time, cos θ are power factor.
Further, in the step (6), increase-volume impedance loss Ci：
Ci=Pin·(P0+K2·Pk)·t
Wherein, PinFor unit electricity rate for incorporation into the power network, P0For transformer noload losses, K is load factor, PkFor transformer impedance
Loss, t is the increase-volume time.
Further, in the step (7), overhaul of the equipments probability cost Cf：
Cf=λ Ff
Wherein, FfUsed for the cost of overhaul.
Further, in the step (8), power failure Default Probability cost Cb：
Cb=λ Fb
Wherein, FbFor power failure promise breaking expense, i.e., to the penalty cost summation paid needed for user during interruption maintenance.
Further, in the step (9), gained mixed economy income Pro：
Pro=R-Ci-Cf-Cb。
Typically work as ProIt is believed that equipment increase-volume operation has economic well-being of workers and staff during more than 0, so can be by ProWhether it is more than 0 to make
For the whether economic evaluation criteria of increase-volume scheme.It is of course also possible to expected revenus is provided, or the maximum that can be born is economical to damage
Lose, with calculating gained ProCompare.
Beneficial effects of the present invention are as follows：It is comprehensive the invention provides a kind of transformer increase-volume scheme Economic Analysis Method
Transformer increase-volume generating profit is closed, overhaul of the equipments cost, four aspects of increase-volume impedance loss and power failure default loss are assessed and become
The economy of depressor increase-volume scheme, increase-volume foundation is provided for policymaker.Consider first and the probability brought is increased by power failure risk
The cost of overhaul and penalty cost, solve the error not caused comprehensively to economy consideration among conventional method, to Practical Project
The assessment of middle increase-volume scheme economy has directive significance.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of increase-volume scheme Economic Analysis Method of the present invention；
Fig. 2 is environment temperature when being 30.2 degrees Celsius, the fault rate figure under different loads rate；
Fig. 3 is environment temperature when being 30.2 degrees Celsius, the generating profit graph under different loads rate；
Fig. 4 is environment temperature when being 30.2 degrees Celsius, the impedance loss cost figure under different loads rate；
Fig. 5 is environment temperature when being 30.2 degrees Celsius, the overhaul of the equipments probability cost figure under different loads rate；
Fig. 6 is environment temperature when being 30.2 degrees Celsius, the power failure Default Probability cost figure under different loads rate；
Fig. 7 is environment temperature when being 30.2 degrees Celsius, the mixed economy payoff diagram under different loads rate.
Embodiment
In order to more specifically describe the present invention, below in conjunction with the accompanying drawings and embodiment is to technical scheme
It is described in detail.
As shown in figure 1, a kind of transformer increase-volume scheme Economic Analysis Method, comprises the following steps：
(1) the environment temperature θ in transformer station high-voltage side bus place is obtaineda, transformer parameter, increase-volume time t, in this case, become
Depressor place of operation environment temperature θaFor 30.2 degrees Celsius, increase-volume time t is 20 minutes.
Transformer parameter includes cooling parameter and economic parameters.
The cooling parameter of transformer is determined by transformer model, the type of cooling, in this example, cooling parameter such as table 1, table 2
It is shown.Wherein, Δ θorFor temperature rise of the top-oil temperature to environment temperature in fuel tank under nominal loss；ΔθhrFor heat under rated current
Temperature rise of the point temperature to top-oil temperature；τoFor oily time constant；τwWinding time constant；X is the oily index of top layer；R is nominal load
The ratio of lower copper loss and iron loss；k11、k21、k22For transformer's type shape parameter, y is around class index.
Table 1：
| Δθor | Δθhr | τo(min) | τw(min) | x |
| 45 | 35 | 150 | 7 | 0.8 |
Table 2：
| R | k11 | k21 | k22 | y |
| 8 | 0.5 | 2.0 | 2.0 | 1.3 |
In this example, economic parameters is as shown in table 3.Wherein, SnFor transformer rated capacity, cos θ are power factor, FfFor
The cost of overhaul is used, FbFor power failure promise breaking expense.
Table 3：
| Sn(MVA) | cosθ | Ff(ten thousand) | Fb(ten thousand) |
| 8 | 0.5 | 100 | 120 |
In addition, the parameter relevant with economic calculating also has PinAnd Pout, respectively rate for incorporation into the power network and sales rate of electricity will be rear
Value and foundation are introduced in the step of face.
(2) desired increase-volume back loading rate K is obtained, the general nameplate data by equipment of this load factor are multiplied by increase-volume multiple
Obtain.It is the influence directly perceived for embodying load factor to economic factor in present embodiment, using apparatus of load rate during nominal load as 1,
Probe under different increase-volume multiples, the change of each economic target.
(3) according to GB/T15164-1994《Oil-immersed power transformer loads directive/guide》The method of middle offer, according to current
Load factor, current environmental temperature and increase-volume load factor, increase-volume duration, the equipment hot(test)-spot temperature θ after increase-volume can be calculatedh。
(4) Arrhenius-Weibull-HI models are used, pass through hot(test)-spot temperature θhFault rate λ can be calculated.
Because this transformer does not carry out health index collection, health index-hot(test)-spot temperature association is carried out in the following way.
β, m for according to historical data be fitted come parameter.TeqFor the equivalent run time of equipment, by the duration and average of putting into operation
Load factor is obtained.Each parameter value is as shown in table 4.
Table 4：
| β | m | Teq |
| 4.18 | -3.68 | 10 (years) |
(5) according to increase-volume load factor, the generating profit R that increase-volume is brought is calculated.This transformer station high-voltage side bus in Zhejiang area,《Zhejiang
Notice of the river Price Control Administration of Shanxi Province on bidding price adjustment relevant issues (Zhejiang valency provides (2016) No. 2)》Middle publicity Zhejiang Province system adjusts coal-fired
Power plant's rate for incorporation into the power network, as shown in table 5.
Table 5：
As shown in table 5, the rate for incorporation into the power network difference of each company is little.PinIt is chosen for all company's generated energy and electricity price weighting is flat
Average 0.3897.
As shown in table 6,《Zhejiang Price Control Administration of Shanxi Province saves notice (the Zhejiang valency money of sales rate of electricity supplied to consumers relevant issues on reduction
(2016) No. 103)》Central publicity Zhejiang Province sales rate of electricity supplied to consumers.
Table 6：
As shown in table 6, power consumption and electricity consumption species produce influence to sales rate of electricity.The main load of this transformer is 220 kilovolts
Commercial power, takes PoutFor 0.6296.Calculate the generating profit that increase-volume is brought：
R=K (Pout-Pin)·Sn·t·cosθ
Wherein, PinFor unit electricity rate for incorporation into the power network, PoutFor unit electricity sales rate of electricity, SnFor transformer rated capacity, t
For the increase-volume time, cos θ are power factor.
(6) according to increase-volume load factor, computing device increase-volume impedance loss：
Ci=Pin·(P0+K2·Pk)·t
Wherein, PinFor unit electricity rate for incorporation into the power network, P0For transformer noload losses, K is load factor, PkFor transformer impedance
Loss, t is the increase-volume time.
(7) according to equipment failure rate, computing device maintenance probability cost：
Cf=λ Ff
Wherein, FfUsed for the cost of overhaul.
(8) according to equipment failure rate, power failure Default Probability cost is calculated：
Cb=λ Fb
Wherein, FbFor power failure promise breaking expense, i.e., to the penalty cost summation paid needed for user during interruption maintenance.
(9) comprehensive transformer generating profit, impedance loss cost, overhaul of the equipments probability cost, and power failure Default Probability
Cost, obtains the mixed economy income under this increase-volume scheme：
Pro=R-Ci-Cf-Cb
It is 0-1.6 by load factor K, brings above-mentioned steps 1-9 into every 0.01 step-length, the focus under each load factor can be obtained
Temperature, fault rate and each economic target, obtain Fig. 2 to Fig. 7 curve based on this, can intuitively reflect parameters
Relation between load factor.Meanwhile, representative data record is chosen among table 7.
Table 7：
Mixed economy income-load factor curve shown in Fig. 7, can help increase-volume policymaker to find and meet cost-effectiveness requirement
Increase-volume it is interval.Such as not go into the red to require, obtained permission increase-volume load factor interval is [0,1.51].
Claims (8)
1. a kind of transformer increase-volume scheme Economic Analysis Method, it is characterised in that comprise the following steps：
(1) environment temperature and transformer parameter in transformer station high-voltage side bus place are obtained, wherein, transformer parameter include cooling parameter and
Economic parameters, the cooling parameter of transformer is determined that economic parameters includes the specified appearance of transformer by transformer model, the type of cooling
Amount, power factor, open circuit loss, load loss, local rate for incorporation into the power network, local sales rate of electricity, transformer cost, maintenance cost,
Penalty cost.
(2) desired increase-volume load factor and increase-volume time are inputted；
(3) according to the increase-volume load factor of input, increase-volume time and transformer parameter, the middle winding of transformer after increase-volume is calculated
The temperature of most thermal region, i.e. hot(test)-spot temperature；
(4) according to resulting hot(test)-spot temperature, the equipment failure rate in time period is calculated；
(5) according to increase-volume load factor, increase-volume time, the rated capacity of transformer and power factor parameter, local rate for incorporation into the power network and
Sales rate of electricity, calculating obtains the generating profit that increase-volume in time period is brought；
(6) according to increase-volume load factor, the increase-volume time, transformer noload losses and short circuit loss parameter are calculated and set in time period
Standby increase-volume impedance loss cost；
(7) used according to equipment failure rate and the cost of overhaul, computing device maintenance probability cost；
(8) according to equipment failure rate and power failure promise breaking expense, power failure Default Probability cost is calculated；Power failure promise breaking expense is examined to have a power failure
To the penalty cost summation paid needed for user during repairing.
(9) comprehensive transformer generating profit, impedance loss cost, overhaul of the equipments probability cost and power failure Default Probability cost,
Obtain the mixed economy income under this increase-volume scheme.
2. transformer increase-volume scheme Economic Analysis Method according to claim 1, it is characterised in that the step (3)
In, using GB/T15164-1994《Oil-immersed power transformer loads directive/guide》The method of middle offer, according to load factor, currently
Environment temperature and increase-volume duration, calculate the equipment hot(test)-spot temperature θ after increase-volumeh。
3. transformer increase-volume scheme Economic Analysis Method according to claim 1, it is characterised in that the step (4)
In, using improved continuous AWH models, pass through hot(test)-spot temperature θhCan computing device fault rate λ：
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Wherein, β, m are to be fitted obtained parameter by historical data；TeqFor the equivalent run time of transformer.L0For transformer
Rated life time, HI is equipment health index.
4. transformer increase-volume scheme Economic Analysis Method according to claim 1, it is characterised in that the step (5)
In, generating profit R：
R=K (Pout-Pin)·Sn·t·cosθ
Wherein, PinFor unit electricity rate for incorporation into the power network, PoutFor unit electricity sales rate of electricity, SnFor transformer rated capacity, t is increasing
Appearance time, cos θ are power factor.
5. transformer increase-volume scheme Economic Analysis Method according to claim 1, it is characterised in that the step (6)
In, increase-volume impedance loss Ci：
Ci=Pin·(P0+K2·Pk)·t
Wherein, PinFor unit electricity rate for incorporation into the power network, P0For transformer noload losses, K is load factor, PkIt is lost for transformer impedance,
T is the increase-volume time.
6. transformer increase-volume scheme Economic Analysis Method according to claim 1, it is characterised in that the step (7)
In, overhaul of the equipments probability cost Cf：
Cf=λ Ff
Wherein, FfUsed for the cost of overhaul.
7. transformer increase-volume scheme Economic Analysis Method according to claim 1, it is characterised in that the step (8)
In, power failure Default Probability cost Cb：
Cb=λ Fb
Wherein, FbFor power failure promise breaking expense, i.e., to the penalty cost summation paid needed for user during interruption maintenance.
8. transformer increase-volume scheme Economic Analysis Method according to claim 1, it is characterised in that the step (9)
In, gained mixed economy income Pro：
Pro=R-Ci-Cf-Cb。
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| CN111817305A (en) * | 2020-06-10 | 2020-10-23 | 国电南瑞科技股份有限公司 | Power grid operation efficiency post-evaluation method and system for capacity increase of power transmission and transformation equipment |
| CN113076511A (en) * | 2021-02-22 | 2021-07-06 | 国网浙江省电力有限公司电力科学研究院 | Loss reduction and energy saving quantitative calculation method for main and distribution network transformer technology |
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| CN105406463A (en) * | 2015-11-13 | 2016-03-16 | 中国电力科学研究院 | Evaluation method for self-adaptive load type distribution transformer operating economy |
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| CN103245857A (en) * | 2013-04-23 | 2013-08-14 | 浙江大学 | Assessment method for loadable index of oil immersed power transformer |
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| CN111817305B (en) * | 2020-06-10 | 2022-05-10 | 国电南瑞科技股份有限公司 | Power grid operation efficiency post-evaluation method and system for capacity increase of power transmission and transformation equipment |
| CN113076511A (en) * | 2021-02-22 | 2021-07-06 | 国网浙江省电力有限公司电力科学研究院 | Loss reduction and energy saving quantitative calculation method for main and distribution network transformer technology |
| CN113076511B (en) * | 2021-02-22 | 2024-06-07 | 国网浙江省电力有限公司电力科学研究院 | Main distribution network transformer technology loss reduction energy saving quantitative calculation method |
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