CN108667078A - It is a kind of based on generating set operating cost parsing area's external power be led to the ancillary service method of cost accounting - Google Patents
It is a kind of based on generating set operating cost parsing area's external power be led to the ancillary service method of cost accounting Download PDFInfo
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- CN108667078A CN108667078A CN201810320124.6A CN201810320124A CN108667078A CN 108667078 A CN108667078 A CN 108667078A CN 201810320124 A CN201810320124 A CN 201810320124A CN 108667078 A CN108667078 A CN 108667078A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
Abstract
The invention discloses a kind of area's external powers based on the parsing of generating set operating cost to be led to the ancillary service method of cost accounting, is related to Operation of Electric Systems, economic analysis field.The present invention is in order to promote assisted hatching fair, based on simulating actual schedule result, calculates the ancillary service cost being led to by area's external power.Area's external power regulating power and system frequency stability requirement are considered in power economic dispatch model；It respectively obtains newly-increased area's external power and replaces the machine unit scheduling result increased newly under area's external power two schemes；It is constituted according to generator operating cost, the ancillary service cost decomposition that area's external power is led to；Calculate spare opportunity cost, the loss of peak regulation mean unit cost of electricity-generating and the start and stop peak regulation cost allowance being led to by area's external power.It can be used for area's external power to share ancillary service cost and to the criterion calculation that conventional power unit compensates, improve China's ancillary service management system, improve the enthusiasm that power plant provides ancillary service.
Description
Technical field
The present invention relates to technical field of electric power more particularly to a kind of area's external powers based on the parsing of generating set operating cost
It is led to the ancillary service method of cost accounting.
Background technology
CHINESE REGION economic development and the characteristics of contrary distribution is geographically presented with energy resources, eastern and central regions economy
Prosperity, electricity needs is big, but primary energy inadequate resource, and west area can provide enough supplies of electric power, therefore Chinese extra-high voltage
Alternating current-direct current builds rapid, " transferring electricity from the west to the east " fast development.The year two thousand twenty is expected, " transferring electricity from the west to the east " capacity reaches two in 2015
Times so that Eastern China power grid is mostly high proportion receiving end power grid.
For receiving end power grid, the access of large capacity area external power has positive work to economics of power generation, environmental protection etc.
With.However, due to outside area power of alterating and direct current have peak modulation capacity relative mistake, single back line capacity big and frequency modulation and standby be not provided
The features such as with service, these features make operational management and the safety and stability problem one side increase system auxiliary of systems face
Demand for services, another aspect area external power do not provide frequency modulation and spare equal ancillary services generally, will make the routine of receiving end power grid
Unit shares more ancillary service ratios.Both sides acts on, and prodigious shadow is generated to the operating status of receiving end power grid unit
It rings, unit may run on uneconomical operating mode even extreme operating condition, and receiving end power grid unit is to provide ancillary service needs to pay more
More operating cost.In existing regulation, it is not included in the examination to area's external power ancillary service, the examination to conventional power unit and benefit
Repay also relatively coarse, there are unjust phenomenons.In order to improve the enthusiasm for providing ancillary service, area's external power should be calculated first and is drawn
The ancillary service cost of cause, and then consider rational cost recovery measure.
Has the ancillary service method of cost accounting that is led to of wind-powered electricity generation in the prior art, but area's external power and simple wind-powered electricity generation go out
Force characteristic is different, and cost impact is not quite identical, only meter and spinning reserve capacity constraint, does not count and primary frequency modulation spare capacity
Constraint, and ancillary service cost is not subjected to analytical Calculation, it is difficult to for the specified of cost recovery standard.
Invention content
Goal of the invention：In view of the problems of the existing technology the present invention, provides a kind of based on generating set operating cost solution
Area's external power of analysis is led to the ancillary service method of cost accounting, and this method considers area's external power regulating power and system frequency is steady
Qualitative requirement is constituted according to generator operating cost, and the ancillary service cost decomposition that area's external power is led to calculates, and contributes to area
The propulsion that external power participates in ancillary service compensation and shares.
Technical solution：It is of the present invention based on generating set operating cost parsing area's external power be led to ancillary service at
This computational methods includes the following steps：
(1) the economic load dispatching model that area's external power participates in receiving end power grid is established, the constraint of the economic load dispatching model considers
The peaking performance and frequency modulation spare capacity of area's external power constrain；
(2) according to the economic load dispatching model, it is horizontal and leave and take to optimize all kinds of unit startup-shutdown states, output inside and outside area
Spare capacity obtains the scheduling result of newly-increased area's external power；
(3) combination that newly-increased area's external power is replaced with to the conventional thermal power generation unit of equal capacity, further according to the warp of foundation
Help scheduling model, optimizes the spare capacity that all kinds of unit startup-shutdown states, output are horizontal and leave and take, after obtaining replacement area external power
Scheduling result；
(4) according to the possible operating status of unit and economic parameters, parsing may cause unit due to the access of area's external power
The composition of operating cost variation；
(5) according to the scheduling result after newly-increased area's external power and replacement area external power, all units in the case of calculating two kinds
Opportunity cost, unit cost of electricity-generating and start-up and shut-down costs, calculate both difference obtain the ancillary service cost that area's external power is led to.
Further, economic load dispatching model described in step (1) is specially：
Min ∑ F=min ∑s (CGk+Cout)+∑SGk
Wherein, F is cost of electricity-generating, CGkFor the energy cost that generates electricity, CoutFor start-up and shut-down costs, SGkFor area's external power electricity at
This, the constraint of economic load dispatching model includes：System power Constraints of Equilibrium, the constraint of system spinning reserve capacity, generating set go out
Force constraint and spare capacity constraint, unit ramping rate constraints, minimum startup-shutdown time-constrain, while considering the tune of area's external power
Peak performance and the constraint of frequency modulation spare capacity.
Further, the constraint of the economic load dispatching model includes：
A, the peaking performance constraint of area's external power：
In formula, Pout,t、For the output, maximum output, minimum load sent a telegram here outside area, NtFor institute's dispatching cycle
Timesharing hop count,For the per day output sent a telegram here outside the area；
B, frequency modulation spare capacity constrains：
Wherein,The primary frequency modulation spare capacity of primary frequency modulation unit, max { P are participated in for t period kth platformsout,tBe t when
The maximum power vacancy of section, Δ f*For the maximum allowable frequency offset of system, KL*For the perunit of the unit power regulation of load
Value, PLoad,tFor the system loading of t moment；σ * are the difference coefficient of generator, Pk,NFor the rated capacity of unit k, Yk,tFor t when
Carve the open state of kth platform unit, Pk,maxIt contributes for the maximum technology of kth platform unit, Pk,tFor the reality of t moment kth platform unit
It arranges to contribute.
Further, in step (4) area's external power access may cause unit operation cost change composition be：
A. the opportunity cost of spare capacity：Cop=(ρprice-CN)×(PN-Pt)×Δt；
B. the unit cost of electricity-generating loss of drop output peak regulation：Closs=Ct-CN；
C. the Unit Commitment cost of start and stop peak regulation；
Wherein, ρpriceFor the rate for incorporation into the power network of such unit, CN、PNGenerated output respectively under declared working condition and unit hair
Electric cost, Pt、CtGenerated output respectively under actual operating mode and unit cost of electricity-generating, Δ t are interval time section.
Further, the opportunity cost, unit cost of electricity-generating and start-up and shut-down costs calculation formula of unit are as follows in step (5)：
A. single period, all conventional power units run spare opportunity cost
B. single period, the mean unit cost of electricity-generating of all conventional power units
C. in dispatching cycle, the start-up and shut-down costs of all units
Wherein,For the rate for incorporation into the power network of the affiliated types of unit k, C () is unit unit cost of electricity-generating function, Pk,tFor t
The practical arrangement of moment power unit k is contributed, C (Pk,t) it is unit cost of electricity-generatings of the power unit k in the t periods, Δ t is each
The length of period, Pk,NFor the rated capacity of unit k, Yk,tFor the open state of t moment kth platform unit, NGFor power unit collection
It closes, NtFor institute's timesharing hop count dispatching cycle, Ck,stUnit k starts or shuts down primary cost.
By above formula, calculate increase newly corresponding cost under two kinds of scheduling results of area's external power and replacement area external power it
Difference, spare opportunity cost, the loss of peak regulation mean unit cost of electricity-generating and the start and stop peak regulation cost damage that as area's external power is led to
It loses.
Advantageous effect：Compared with prior art, the present invention its remarkable advantage is：The present invention is to simulate actual schedule result
Basis calculates the ancillary service cost being led to by area's external power, it is contemplated that area's external power regulating power and system frequency stability
It is required that and being constituted according to generator operating cost, the ancillary service cost decomposition calculating that area's external power is led to.It can be used for outside area
Power supply shares ancillary service cost and to the criterion calculation that conventional power unit compensates, and improves China's ancillary service managing system
Degree improves the enthusiasm that power plant provides ancillary service, promotes high proportion receiving end electricity net safety stable economical operation.
Description of the drawings
Fig. 1 is the general flow chart of the method for the present invention；
Fig. 2 is the relational graph of single unit unit cost of electricity-generating and generated output；
Fig. 3 is to be led to that opportunity cost and unit cost of electricity-generating calculate based on area's external power that generating set operating cost parses
As a result.
Specific implementation mode
Technical solution of the present invention is described in further detail with reference to specific embodiment, so that the skill of this field
Art personnel can be better understood from the present invention and can be practiced, but illustrated embodiment is not as a limitation of the invention.
It present embodiments provides a kind of area's external power parsed based on generating set operating cost and is led to ancillary service cost
Computational methods, as shown in Figure 1, including the following steps：
(1) the economic load dispatching model that area's external power participates in receiving end power grid is established, the constraint of the economic load dispatching model considers
The peaking performance and frequency modulation spare capacity of area's external power constrain.
Scheduling model with the minimum optimization aim of cost of electricity-generating, object function include local all kinds of units power generation electricity at
This CGkWith start-up and shut-down costs Cout, area's external power energy cost SGk：
Min ∑ F=min ∑s (CGk+Cout)+∑SGk
Constraints in model includes：System power Constraints of Equilibrium, the constraint of system spinning reserve capacity, generating set
Units limits and spare capacity constraint, unit ramping rate constraints, minimum startup-shutdown time-constrain.Above-mentioned constraint is all existing skill
Art, details are not described herein.This model also considers peaking performance and the constraint of frequency modulation spare capacity of area's external power simultaneously, specially：
A, the peaking performance constraint of area's external power：
In formula, Pout,t、For the output, maximum output, minimum load sent a telegram here outside area, NtFor institute's dispatching cycle
Timesharing hop count,For the per day output sent a telegram here outside the area；
B, frequency modulation spare capacity constrains：
Wherein,The primary frequency modulation spare capacity of primary frequency modulation unit, max { P are participated in for t period kth platformsout,tBe t when
The maximum power vacancy of section, Δ f*For the maximum allowable frequency offset of system, KL*For the perunit of the unit power regulation of load
Value, PLoad,tFor the system loading of t moment；σ * are the difference coefficient of generator, Pk,NFor the rated capacity of unit k, Yk,tFor t when
Carve the open state of kth platform unit, Pk,maxIt contributes for the maximum technology of kth platform unit, Pk,tFor the reality of t moment kth platform unit
It arranges to contribute.
According to practical experience, constant value KL*=1.8, σ*=5%；According to《National interconnected network management and running regulation》
In, it is desirable that frequency must not exceed 50 ± 0.2Hz, this example takes maximum frequency deviation Δ f=0.2Hz；Finally, the power of day part
Vacancy max { Pout,tIt is taken as the largest passages transmission power of the period extra-high voltage exterior power supply, when dispatching cycle is 24 on the one
Section.
(2) according to the economic load dispatching model, it is horizontal and leave and take to optimize all kinds of unit startup-shutdown states, output inside and outside area
Spare capacity obtains the scheduling result of newly-increased area's external power；
For example, being designed according to certain provincial power network, unit information and system loading etc. relatively meet reality.Receiving end power grid machine
Group information is shown in Table 1, and area's dispatch from foreign news agency source information is shown in Table 2.
1 each unit parameter of receiving end power grid of table
2 area's external power parameter of table
In area's external power, number 6-11 is newly-increased area's external power.
(3) combination that newly-increased area's external power is replaced with to the conventional thermal power generation unit of equal capacity, further according to the warp of foundation
Help scheduling model, optimizes the spare capacity that all kinds of unit startup-shutdown states, output are horizontal and leave and take, after obtaining replacement area external power
Scheduling result；
Example is connected, increases area's external power capacity and about 3800MW newly, replaces with total capacity as the equal capacity thermal motor of 3900MW
Group, information are shown in Table 3.
Table 3 is used to replace each unit parameter of receiving end power grid of newly-increased area's external power
(4) according to the possible operating status of unit and economic parameters, parsing may cause unit due to the access of area's external power
The composition of operating cost variation.
Generally had according to large copacity power supply outside area peak modulation capacity is poor, area's external power single back line capacity greatly, reliability not
Stable feature needs local conventional power unit to undertake more peak regulation tasks, reserves more spinning reserve capacities and primary tune
Frequency capacity causes conventional power unit to need the start and stop number for reducing operation of contributing, increasing unit.Cause in unit cost of electricity-generating
It rises, is peak regulation cost, the opportunity cost of idle capacity increases, and is spare capacity cost；Unit Commitment may be caused by simultaneously
Number increases, additional to increase Unit Commitment peak regulation cost.
As shown in Fig. 2, oblique line is the relationship of single unit unit cost of electricity-generating and generated output, ρpriceFor such unit
Rate for incorporation into the power network.Consider that the influence of area's external power, generating set are to provide peak regulation and spare equal ancillary services, make unit operation point from
A is moved to B.Unit cost of electricity-generating rises, and is peak regulation cost, and the opportunity cost of idle capacity increases, and is spare capacity cost.Together
Shi Keneng is caused by the increase of Unit Commitment number, additional to increase Unit Commitment peak regulation cost.
For single unit, the ancillary service increase cost that area's external power may be led to is configured to：
A. the opportunity cost of spare capacity：Cop=(ρprice-CN)×(PN-Pt)×Δt
B. the unit cost of electricity-generating loss of drop output peak regulation：Closs=Ct-CN
C. the Unit Commitment cost of start and stop peak regulation
Wherein, CN、PNGenerated output respectively under declared working condition and unit cost of electricity-generating, Pt、CtRespectively actual motion
Generated output under operating mode and unit cost of electricity-generating.
(5) according to the scheduling result after newly-increased area's external power and replacement area external power, all units in the case of calculating two kinds
Opportunity cost, unit cost of electricity-generating and start-up and shut-down costs, calculate both difference obtain the ancillary service cost that area's external power is led to.
A. single period, all conventional power units run spare opportunity cost：
B. single period, the mean unit cost of electricity-generating of all conventional power units：
C. in dispatching cycle, the start-up and shut-down costs of all units：
Wherein,For the rate for incorporation into the power network of the affiliated types of unit k, C () unit unit cost of electricity-generating function, C (Pk,t) be
Unit cost of electricity-generatings of the power unit k in the t periods, Δ t are the length of each period, Ck,stUnit k starts or shuts down primary
Cost.
Fired power generating unit rate for incorporation into the power network is 391 yuan/MWh, and the rate for incorporation into the power network of Gas Generator Set is 690 yuan/MWh.
By above formula, calculate increase newly corresponding cost under two kinds of scheduling results of area's external power and replacement area external power it
Difference, spare opportunity cost, the loss of peak regulation mean unit cost of electricity-generating and the start and stop peak regulation cost damage that as area's external power is led to
It loses, is shown in Table 4.
4 area's external power of table is led to ancillary service cost calculation result
By table 4, in terms of opportunity cost, increase newly twice that the opportunity cost under area's external power scheme is more than alternative solution, it can
Group leads to a large amount of idle booting capacity, to cause to provide peak regulation, more spinning reserves and primary frequency modulation capacity according to circumstances
The sharp increase of opportunity cost, the spare opportunity cost of fired power generating unit and Gas Generator Set that area's external power is led to is respectively 6,270,000 yuan, 340,000
Member amounts to 6,610,000 yuan.Gas Generator Set installation total amount is small, also corresponding smaller in the accounting of cost, but the cost of electricity-generating of Gas Generator Set
Far above fired power generating unit, it is 31.6 yuan/MWh that area's external power, which is led to that peak regulation unit cost of electricity-generating increases, is led to peak regulation start-up and shut-down costs
3910000 yuan.
Fig. 3 compared being led to opportunity cost and unit cost of electricity-generating based on area's external power that generating set operating cost parses
Result of calculation, it can be seen that：Area's external power is led to that the unit cost of electricity-generating of internal heat motor group increases ratio about 6%-14%, relatively
Uniformly；And the opportunity cost increase ratio that area's external power is led to is larger in day part difference.
Claims (5)
1. a kind of area's external power based on the parsing of generating set operating cost is led to that the ancillary service method of cost accounting, feature exist
In including the following steps：
(1) the economic load dispatching model that area's external power participates in receiving end power grid is established, the constraint of the economic load dispatching model considers outside area
The peaking performance and frequency modulation spare capacity of power supply constrain；
(2) according to the economic load dispatching model, optimize all kinds of unit startup-shutdown states inside and outside area, output level and leave and take spare
Capacity obtains the scheduling result of newly-increased area's external power；
(3) combination that newly-increased area's external power is replaced with to the conventional thermal power generation unit of equal capacity, is adjusted further according to the economy of foundation
Model is spent, optimizes the spare capacity that all kinds of unit startup-shutdown states, output are horizontal and leave and take, obtains the tune after replacement area external power
Spend result；
(4) according to the possible operating status of unit and economic parameters, parsing may cause unit operation due to the access of area's external power
The composition of cost variation；
(5) according to the scheduling result after newly-increased area's external power and replacement area external power, the machine of all units in the case of two kinds is calculated
Meeting cost, unit cost of electricity-generating and start-up and shut-down costs calculate the two difference and obtain the ancillary service cost that area's external power is led to.
2. it is according to claim 1 it is a kind of based on generating set operating cost parsing area's external power be led to ancillary service at
This computational methods, it is characterised in that：Economic load dispatching model is specially described in step (1)：
Min ∑ F=min ∑s (CGk+Cout)+∑SGk
Wherein, F is cost of electricity-generating, CGkFor the energy cost that generates electricity, CoutFor start-up and shut-down costs, SGkFor the energy cost of area's external power, warp
Ji scheduling model constraint include：System power Constraints of Equilibrium, system spinning reserve capacity constraint, generating set units limits
With spare capacity constraint, unit ramping rate constraints, minimum startup-shutdown time-constrain, while the peaking performance of area's external power is considered
It is constrained with frequency modulation spare capacity.
3. it is according to claim 2 it is a kind of based on generating set operating cost parsing area's external power be led to ancillary service at
This computational methods, it is characterised in that：The constraint of the economic load dispatching model includes：
A, the peaking performance constraint of area's external power：
In formula, Pout,t、For the output, maximum output, minimum load sent a telegram here outside area, NtFor institute's timesharing dispatching cycle
Hop count,For the per day output sent a telegram here outside the area；
B, frequency modulation spare capacity constrains：
Wherein,The primary frequency modulation spare capacity of primary frequency modulation unit, max { P are participated in for t period kth platformsout,tIt is the t periods
Maximum power vacancy, Δ f*For the maximum allowable frequency offset of system, KL*For the perunit value of the unit power regulation of load,
PLoad,tFor the system loading of t moment；σ * are the difference coefficient of generator, Pk,NFor the rated capacity of unit k, Yk,tFor t moment
The open state of k platform units, Pk,maxIt contributes for the maximum technology of kth platform unit, Pk,tFor the practical arrangement of t moment kth platform unit
It contributes.
4. it is according to claim 1 it is a kind of based on generating set operating cost parsing area's external power be led to ancillary service at
This computational methods, it is characterised in that：In step (4) area's external power access may cause unit operation cost change composition be：
A. the opportunity cost of spare capacity：Cop=(ρprice-CN)×(PN-Pt)×Δt；
B. the unit cost of electricity-generating loss of drop output peak regulation：Closs=Ct-CN；
C. the Unit Commitment cost of start and stop peak regulation；
Wherein, ρpriceFor the rate for incorporation into the power network of such unit, CN、PNGenerated output respectively under declared working condition and unit power generation at
This, Pt、CtGenerated output respectively under actual operating mode and unit cost of electricity-generating, Δ t are interval time section.
5. it is according to claim 1 it is a kind of based on generating set operating cost parsing area's external power be led to ancillary service at
This computational methods, it is characterised in that：The opportunity cost, unit cost of electricity-generating and start-up and shut-down costs calculation formula of unit in step (5)
It is as follows：
A. single period, all conventional power units run spare opportunity cost
B. single period, the mean unit cost of electricity-generating of all conventional power units
C. in dispatching cycle, the start-up and shut-down costs of all units
Wherein,For the rate for incorporation into the power network of the affiliated types of unit k, C () is unit unit cost of electricity-generating function, Pk,tFor t moment
The practical arrangement of power unit k is contributed, C (Pk,t) it is unit cost of electricity-generatings of the power unit k in the t periods, Δ t is each period
Length, Pk,NFor the rated capacity of unit k, Yk,tFor the open state of t moment kth platform unit, NGFor power unit set, Nt
For institute's timesharing hop count dispatching cycle, Ck,stUnit k starts or shuts down primary cost.
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| CN111415041A (en) * | 2020-03-20 | 2020-07-14 | 海南电网有限责任公司 | Method for evaluating economy of power grid planning scheme |
| CN111415041B (en) * | 2020-03-20 | 2024-01-05 | 海南电网有限责任公司 | Method for evaluating economy of power grid planning scheme |
| CN112003270A (en) * | 2020-08-06 | 2020-11-27 | 国网浙江省电力有限公司衢州供电公司 | Reactive auxiliary service optimization scheduling method applied to power market environment |
| CN112003270B (en) * | 2020-08-06 | 2022-03-18 | 国网浙江省电力有限公司衢州供电公司 | Reactive auxiliary service optimization scheduling method applied to power market environment |
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