CN108923472A - Combine power output dispatching method with fired power generating unit based on the photo-thermal power station of Optimum cost - Google Patents
Combine power output dispatching method with fired power generating unit based on the photo-thermal power station of Optimum cost Download PDFInfo
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Abstract
The present invention relates to a kind of to combine power output dispatching method based on the photo-thermal power station of Optimum cost with fired power generating unit, its main feature is that：Light transfer characteristic analysis including photo-thermal power station；The foundation and the contents such as photo-thermal power generation and the determination of fired power generating unit combined dispatching value of the power output scheduling cost model of photo-thermal power station containing heat accumulation, start with from the analysis of the light transfer characteristic of photo-thermal power station, comprehensively consider environmental benefit and operation expense, the constraint of system spinning reserve cost and electric power netting safe running of the grid-connected consumption of fired power generating unit cost of electricity-generating, photo-thermal power generation, using Optimum cost as target, the optimal power output dispatch value of photo-thermal power generation and fired power generating unit has been determined, with scientific and reasonable, the advantages that scheduling is accurate, and effect is good.
Description
Technical field
It is a kind of power output to be combined with fired power generating unit based on the photo-thermal power station of Optimum cost the present invention relates to distribution technique field
Dispatching method.
Background technique
There are photovoltaic (photovoltaic, PV) power generation and photo-thermal in the way of solar energy on a large scale at present
(concentrating solar power, CSP) power generation.For opposite photovoltaic power generation, photo-thermal power generation is started late, and develops phase
To slow, but with economic and science and technology continuous development, the scale of photo-thermal power generation constantly expands.According to world energy sources administration, it is expected that
Whole world photo-thermal installed capacity in 2025 is up to 22GW, and the year two thousand fifty whole world photo-thermal power generation amount will account for global total power generation
11.3%.
It is influenced by the intrinsic Resource Properties of solar energy, photo-thermal power generation has intermittent and uncertain, extensive photo-thermal hair
The grid-connected safety and economy that can threaten operation of power networks of electricity.Photo-thermal power station containing heat accumulation can store thermal energy, realize out
Power is adjustable, controllable, and then can realize that overall cost is optimal on the basis of guaranteeing photo-thermal power generation networking safe operation
Target.Currently, China realizes photo-thermal power generation and fired power generating unit in the solar energy resources such as Qinghai, Gansu area abundant
Combine and is incorporated into the power networks.How taking into account networking operation safety and rational management photo-thermal power generation on the basis of economy, become me
The major issue that state's photo-thermal power generation extensive development and grid-connected consumption face.
Summary of the invention
The technical problem to be solved by the present invention is to, propose that a kind of analyze from the light transfer characteristic of photo-thermal power station is started with,
The environmental benefit and operation expense, system for comprehensively considering the grid-connected consumption of fired power generating unit cost of electricity-generating, photo-thermal power generation rotate standby
It is constrained with cost and electric power netting safe running, scientific and reasonable using Optimum cost as target, the optimal photo-thermal power station of effect and thermoelectricity
Unit joint power output dispatching method.
Solving the scheme that its technical problem uses is：A kind of photo-thermal power station based on Optimum cost is combined out with fired power generating unit
Power dispatching method, characterized in that start with from the analysis of the light transfer characteristic of photo-thermal power station, using Optimum cost as target, determine light
The optimal power output dispatch value of heat power generation and fired power generating unit, specifically includes following steps：
1) light transfer characteristic of photo-thermal power station
Photo-thermal power station is made of light field, heat reservoir and thermodynamic cycle three parts substantially, by conducting heat between each component part
Fluid carries out energy transmission；Main working process is：Photo-thermal power station absorbs solar energy using heat collector, will absorb solar energy and turns
Thermal energy is turned to, circulation system is transferred thermal energy to by heat-transfer fluid, and then generate Steam Actuation steam turbine and obtain electric energy,
Realize optical and thermal-electricity conversion process；At the same time, thermal energy can be stored by heat-transfer fluid to heat reservoir, according to scheduling
Demand heat release power generation；
2) power output of photo-thermal power station containing heat accumulation scheduling cost model
(1) foundation of photo-thermal power station and fired power generating unit integrated distribution model
Comprehensively consider the environmental benefit of the grid-connected consumption of fired power generating unit cost of electricity-generating, photo-thermal power generation and operation expense, is
It unites spinning reserve capacity cost, establish photo-thermal power generation and fired power generating unit economic optimum combines scheduling model of contributing：
E=min [E1-E2+E3+E4] (1)
Wherein：Overall cost when E is photo-thermal power station networking operation；E1For fired power generating unit cost of electricity-generating；E2For photo-thermal power generation
Environmental benefit；E3For system reserve capacity cost；E4For the operation expense of photo-thermal power generation；
Photo-thermal power generation is grid-connected will cause larger impact to the operation of power grid, can change fired power generating unit to meet dispatching requirement
Power output size and plan for start-up and shut-down；The cost of electricity-generating E of fired power generating unit1Fuel cost and start-up and shut-down costs including unit calculate
For (2) formula：
E1=e1(Pi)+e2(ui) (2)
Wherein：e1For fuel cost；e2For start-up and shut-down costs；PiFor the generated output of fired power generating unit i；uiFor fired power generating unit i's
Operating status；
e1Be calculated as (3) formula：
e2Be calculated as (4) formula：
Wherein：PitFor unit i the t period generated output；uitFor unit i the t period operating status；SiFor machine
The start-up cost of group i；ai, bi, ciFor the fuel cost coefficient of unit i；N is the quantity of fired power generating unit；T is total period；t
For the moment；I is i-th of unit；
The grid-connected generated energy that can reduce fired power generating unit of photo-thermal power generation reduces coal consumption, so that the discharge of pollutant be effectively reduced
Amount, achievees the purpose that environmental protection, photo-thermal power generation environmental benefit E at this time2Be calculated as (5) formula：
Wherein：PiGtFor photo-thermal power station i the t period output power；kGThe environmental benefit system for being photo-thermal power generation after grid-connected
Number；M is the quantity of grid-connected photo-thermal power station；
To guarantee safe operation of power system, certain spare capacity need to be reserved to cope with load prediction error, and prominent
Hair accident, system reserve capacity need certain cost；Since photo-thermal power generation has certain randomness, it will cause spare
Increased costs, at this time system reserve cost E3Be calculated as (6) formula：
Wherein：UitFor unit i t moment positive rotation spare capacity；DitHold for unit i in the negative spinning reserve of t moment
Amount；RitFor unit i t moment emergency reserve capacity；αiFor the positive rotation stand-by cost coefficient of unit i；βiFor the negative of unit i
Spinning reserve cost coefficient；γiFor the emergency duty cost coefficient of unit i；
Since photo-thermal power station needs some necessary heat-preserving equipments and maintenance measure in the process of running, generating electricity
While can generate certain operation expense, the operation expense E of photo-thermal power generation4Be calculated as (7) formula：
Wherein：kisFor the operation expense coefficient of photo-thermal power station i；For the electromotive power output of t moment photo-thermal power station；
The output power of photo-thermal power station is codetermined by the thermal power of heat collector and heat reservoir, therefore, photo-thermal power station
Generated output be calculated as (8) formula：
Wherein：ηdFor conversion efficiency of thermoelectric；For the thermal power of t moment heat collector；It is heat-storing device in t
The heat accumulation power at quarter；For heat-storing device t moment heat release power；ηcHeat loss rate is filled for heat reservoir；ηfFor heat accumulation
The heat release loss late of system；
(2) system operation constraint
Ignore via net loss, the sum of fired power generating unit and photo-thermal power station output power are balanced with load power, are calculated as (9)
Formula：
Wherein：PLtFor the load power of t period；
Positive and negative spinning reserve capacity when operation of power networks is constrained to (10) formula：
Wherein：UiFor the positive rotation spare capacity of fired power generating unit i；DiFor the negative spinning reserve capacity of fired power generating unit i；Pimax
For the maximum output of fired power generating unit i；PiminFor the minimum load of fired power generating unit i；ruiIt climb ratio of slope for the maximum of unit i；rdi
For the maximum rate of climbing downwards of unit i；L is load prediction error rate；
Units limits when fired power generating unit starting and stoppage in transit are (11) formula：
Synchronization, heat accumulation cannot carry out simultaneously with heat release, be (12) formula：
Pt TS,cPt TS,f=0 (12)
To meet the needs of next scheduling slot, heat reservoir one dispatching cycle whole story quantity of heat storage remain unchanged,
For (13) formula：
Wherein：For the initial value of heat reservoir quantity of heat storage in dispatching cycle；It is stored up for heat reservoir in dispatching cycle
The end value of heat；
Photo-thermal power station units limits are (14) formula：
PGmin≤PGt≤PGmax (14)
Wherein：PGmaxFor the maximum output of photo-thermal power station；PGminFor the minimum load of photo-thermal power station；PGtExist for photo-thermal power station
The output power of t period；
3) determination of photo-thermal power generation and fired power generating unit combined dispatching value
Fired power generating unit and photo-thermal power station power output are encoded, initial population is generated, is selected, intersected, the operations such as variation are formed
Progeny population determines progeny population fitness, and the parent population low with the high progeny population substitution fitness of fitness；It adapts to
It spends highest parent population and directly remains into progeny population, the minimum progeny population of substitution fitness；Judging whether to meet terminates
Condition obtains the output power of fired power generating unit and photo-thermal power station if so, being decoded operation；Otherwise it selected, handed over again
Fork, the operation such as variation export optimal value until meeting termination condition.
It is of the invention it is a kind of combine power output dispatching method with fired power generating unit based on the photo-thermal power station of Optimum cost, due to from light
The light transfer characteristic analysis of thermo-power station is started with, and the environment of the grid-connected consumption of fired power generating unit cost of electricity-generating, photo-thermal power generation is comprehensively considered
Benefit and operation expense, system spinning reserve cost and electric power netting safe running constraint are determined using Optimum cost as target
The power output dispatch value of photo-thermal power generation and fired power generating unit, has many advantages, such as scientific and reasonable, and effect is best.
Detailed description of the invention
Fig. 1 is load prediction power schematic diagram；
Fig. 2 is photo-thermal power station networking operation overall cost convergence property schematic diagram；
Fig. 3 is the power output scheduling schematic diagram of photo-thermal power station containing heat accumulation；
Fig. 4 is the optimal power output dispatch curve schematic diagram of each fired power generating unit；
Fig. 5 is heat reservoir storage thermal power schematic diagram.
Specific embodiment
A kind of photo-thermal power station based on Optimum cost of the present invention is combined with fired power generating unit below with drawings and examples
Power output dispatching method is described further.
It is of the invention it is a kind of combine power output dispatching method with fired power generating unit based on the photo-thermal power station of Optimum cost, from photo-thermal electricity
The light transfer characteristic analysis stood is started with, and using Optimum cost as target, determines the optimal power output tune of photo-thermal power generation and fired power generating unit
Angle value specifically includes following steps：
1) light transfer characteristic of photo-thermal power station
Photo-thermal power station is made of light field, heat reservoir and thermodynamic cycle three parts substantially, by conducting heat between each component part
Fluid carries out energy transmission；Main working process is：Photo-thermal power station absorbs solar energy using heat collector, will absorb solar energy and turns
Thermal energy is turned to, circulation system is transferred thermal energy to by heat-transfer fluid, and then generate Steam Actuation steam turbine and obtain electric energy,
Realize optical and thermal-electricity conversion process；At the same time, thermal energy can be stored by heat-transfer fluid to heat reservoir, according to scheduling
Demand heat release power generation；
2) power output of photo-thermal power station containing heat accumulation scheduling cost model
(1) foundation of photo-thermal power station and fired power generating unit integrated distribution model
Comprehensively consider the environmental benefit of the grid-connected consumption of fired power generating unit cost of electricity-generating, photo-thermal power generation and operation expense, is
It unites spinning reserve capacity cost, establish photo-thermal power generation and fired power generating unit economic optimum combines scheduling model of contributing：
E=min [E1-E2+E3+E4] (1)
Wherein：Overall cost when E is photo-thermal power station networking operation；E1For fired power generating unit cost of electricity-generating；E2For photo-thermal power generation
Environmental benefit；E3For system reserve capacity cost；E4For the operation expense of photo-thermal power generation；
Photo-thermal power generation is grid-connected will cause larger impact to the operation of power grid, can change fired power generating unit to meet dispatching requirement
Power output size and plan for start-up and shut-down；The cost of electricity-generating E of fired power generating unit1Fuel cost and start-up and shut-down costs including unit calculate
For (2) formula：
E1=e1(Pi)+e2(ui) (2)
Wherein：e1For fuel cost；e2For start-up and shut-down costs；PiFor the generated output of fired power generating unit i；uiFor fired power generating unit i's
Operating status；
e1Be calculated as (3) formula：
e2Be calculated as (4) formula：
Wherein：PitFor unit i the t period generated output；uitFor unit i the t period operating status；SiFor machine
The start-up cost of group i；ai, bi, ciFor the fuel cost coefficient of unit i；N is the quantity of fired power generating unit；T is total period；t
For the moment；I is i-th of unit；
The grid-connected generated energy that can reduce fired power generating unit of photo-thermal power generation reduces coal consumption, so that the discharge of pollutant be effectively reduced
Amount, achievees the purpose that environmental protection, photo-thermal power generation environmental benefit E at this time2Be calculated as (5) formula：
Wherein：PiGtFor photo-thermal power station i the t period output power；kGThe environmental benefit system for being photo-thermal power generation after grid-connected
Number；M is the quantity of grid-connected photo-thermal power station；
To guarantee safe operation of power system, certain spare capacity need to be reserved to cope with load prediction error, and prominent
Hair accident, system reserve capacity need certain cost；Since photo-thermal power generation has certain randomness, it will cause spare
Increased costs, at this time system reserve cost E3Be calculated as (6) formula：
Wherein：UitFor unit i t moment positive rotation spare capacity；DitHold for unit i in the negative spinning reserve of t moment
Amount；RitFor unit i t moment emergency reserve capacity；αiFor the positive rotation stand-by cost coefficient of unit i；βiFor the negative of unit i
Spinning reserve cost coefficient；γiFor the emergency duty cost coefficient of unit i；
Since photo-thermal power station needs some necessary heat-preserving equipments and maintenance measure in the process of running, generating electricity
While can generate certain operation expense, the operation expense E of photo-thermal power generation4Be calculated as (7) formula：
Wherein：kisFor the operation expense coefficient of photo-thermal power station i；For the electromotive power output of t moment photo-thermal power station；
The output power of photo-thermal power station is codetermined by the thermal power of heat collector and heat reservoir, therefore, photo-thermal power station
Generated output be calculated as (8) formula：
Wherein：ηdFor conversion efficiency of thermoelectric；For the thermal power of t moment heat collector；It is heat-storing device in t
The heat accumulation power at quarter；For heat-storing device t moment heat release power；ηcHeat loss rate is filled for heat reservoir；ηfFor heat accumulation
The heat release loss late of system；
(2) system operation constraint
Ignore via net loss, the sum of fired power generating unit and photo-thermal power station output power are balanced with load power, are calculated as (9)
Formula：
Wherein：PLtFor the load power of t period；
Positive and negative spinning reserve capacity when operation of power networks is constrained to (10) formula：
Wherein：UiFor the positive rotation spare capacity of fired power generating unit i；DiFor the negative spinning reserve capacity of fired power generating unit i；Pimax
For the maximum output of fired power generating unit i；PiminFor the minimum load of fired power generating unit i；ruiIt climb ratio of slope for the maximum of unit i；rdi
For the maximum rate of climbing downwards of unit i；L is load prediction error rate；
Units limits when fired power generating unit starting and stoppage in transit are (11) formula：
Synchronization, heat accumulation cannot carry out simultaneously with heat release, be (12) formula：
Pt TS,cPt TS,f=0 (12)
To meet the needs of next scheduling slot, heat reservoir one dispatching cycle whole story quantity of heat storage remain unchanged,
For (13) formula：
Wherein：For the initial value of heat reservoir quantity of heat storage in dispatching cycle；It is stored up for heat reservoir in dispatching cycle
The end value of heat；
Photo-thermal power station units limits are (14) formula：
PGmin≤PGt≤PGmax (14)
Wherein：PGmaxFor the maximum output of photo-thermal power station；PGminFor the minimum load of photo-thermal power station；PGtExist for photo-thermal power station
The output power of t period；
3) determination of photo-thermal power generation and fired power generating unit combined dispatching value
Fired power generating unit and photo-thermal power station power output are encoded, initial population is generated, is selected, intersected, the operations such as variation are formed
Progeny population determines progeny population fitness, and the parent population low with the high progeny population substitution fitness of fitness；It adapts to
It spends highest parent population and directly remains into progeny population, the minimum progeny population of substitution fitness；Judging whether to meet terminates
Condition obtains the output power of fired power generating unit and photo-thermal power station if so, being decoded operation；Otherwise it selected, handed over again
Fork, the operation such as variation export optimal value until meeting termination condition.
The present embodiment is analyzed with IEEE-30 node system, using the standard genetic algorithm containing elitism strategy, is solved comprehensive
The optimal power output of photo-thermal power station and fired power generating unit when closing cost minimization, verifies feasibility and validity of the invention, chooses 1 year
In representative Spring Equinox, the Summer Solstice, the Autumnal Equinox and Winter Solstice four days, carry out specific economic load dispatching analysis.There are 6 thermoelectricitys in system
Unit, specific data are as shown in table 1, and the design parameter of 100MW photo-thermal power station is as shown in table 2,24 period of typical deployments day it is pre-
It is as shown in Figure 1 to survey load value.
1 conventional power unit parameter of table
2 100MW photo-thermal power station parameter of table
1. the light transfer characteristic of photo-thermal power station
Photo-thermal power generation and other generations of electricity by new energy have apparent difference, are mainly reflected in and are configured with heat reservoir, energy
It is enough that optical and thermal-electricity conversion process is controlled, and then adjust generated output.The main working process of photo-thermal power generation is as follows：Photo-thermal
Power station absorbs solar energy using heat collector, is translated into thermal energy, transfers thermal energy to thermodynamic cycle system by heat-transfer fluid
System, and then generate Steam Actuation steam turbine and obtain electric energy, realize optical and thermal-electricity conversion process；At the same time, thermal energy can lead to
It crosses heat-transfer fluid to store to heat reservoir, be generated electricity according to dispatching requirement heat release.
2. the power output scheduling cost model of photo-thermal power station containing heat accumulation
As follows, the environmental benefit coefficient k after photo-thermal power generation is grid-connected is arranged in numerical value in calculating processGFor 230 yuan/MW, take
rdi=rui, rdG=ruG, it is 300 that genetic algorithm, which chooses initial population scale size, maximum number of iterations 300.Participate in intersection fortune
The ratio that the chromosome number of calculation accounts for all total chromosome numbers is 0.9, and the gene digit to morph accounts for all chromosomal genes
The ratio of total bit is 0.25, A=1.0*106, establish the integrated distribution model of photo-thermal power generation and fired power generating unit.
3. the determination of photo-thermal power generation and fired power generating unit combined dispatching value
Fired power generating unit and photo-thermal power station power output are encoded, initial population is generated, is selected, intersected, the operations such as variation are formed
Progeny population determines progeny population fitness, and the parent population low with the high progeny population substitution fitness of fitness.It adapts to
It spends highest parent population and directly remains into progeny population, the minimum progeny population of substitution fitness, until obtaining photo-thermal power generation
With the optimal power output dispatch value of fired power generating unit.
Photo-thermal power station networking operation overall cost convergence property in calculating process is as shown in Fig. 2, from Figure 2 it can be seen that Winter Solstice
The integrated operation cost highest of day, the summer solstice is minimum, and the Spring Equinox is not much different with the Autumnal Equinox.Also, it can be seen that passing through heat accumulation system
Photo-thermal power station power output is adjusted in system, and the operating cost of system can be made to significantly reduce.
When the integrated operation cost of system is minimum, the scheduling of the power output of photo-thermal power station containing heat accumulation is as shown in figure 3, each fired power generating unit
The scheduling of optimal power output as shown in figure 4, heat reservoir storage thermal power as shown in figure 5, photo-thermal power station power output and Fig. 1 in comparison diagram 3
Middle grid load curve sufficiently shows as it can be seen that the variation of load is followed in the Optimum Economic scheduling of photo-thermal power station to a certain extent
Photo-thermal power station heat reservoir bring is contributed schedulability.As seen from Figure 4, the lower-cost fired power generating unit power output of coal consumption
Larger, it is horizontal that the fired power generating unit power output of coal consumption higher cost is kept at lower power output.Comparison diagram 3 and Fig. 4 are as it can be seen that in photo-thermal
When output of power station is larger, the generated output of each fired power generating unit is kept near minimum load, reduces the power generation of fired power generating unit
Amount, thereby reduces the fuel cost of fired power generating unit.As seen from Figure 5, quantity of heat storage and thermal discharge phase in a dispatching cycle
Together, i.e. whole story value of the heat reservoir within dispatching cycle is consistent, and heat accumulation and heat release are not carried out in synchronization.Heat accumulation system
System is in load valley phase heat accumulation, in load boom period heat release, achievees the purpose that shift photo-thermal power station generated energy, to realize photo-thermal
The power output of power generation is dispatched.
Design conditions, legend in the embodiment of the present invention etc. are only used for that the present invention is further illustrated, not exhaustive,
Do not constitute the restriction to claims, the enlightenment that those skilled in the art obtain according to embodiments of the present invention, no
It would occur to other substantially equivalent substitutions by creative work, all fall in the scope of protection of the present invention.
Claims (1)
1. a kind of combine power output dispatching method based on the photo-thermal power station of Optimum cost with fired power generating unit, characterized in that from photo-thermal electricity
The light transfer characteristic analysis stood is started with, and using Optimum cost as target, determines the optimal power output tune of photo-thermal power generation and fired power generating unit
Angle value specifically includes following steps：
1) light transfer characteristic of photo-thermal power station
Photo-thermal power station is made of light field, heat reservoir and thermodynamic cycle three parts substantially, by heat-transfer fluid between each component part
Carry out energy transmission；Main working process is：Photo-thermal power station absorbs solar energy using heat collector, will absorb solar energy and is converted into
Thermal energy transfers thermal energy to circulation system by heat-transfer fluid, and then generates Steam Actuation steam turbine and obtain electric energy, realizes
Optical and thermal-electricity conversion process；At the same time, thermal energy can be stored by heat-transfer fluid to heat reservoir, according to dispatching requirement
Heat release power generation；
2) power output of photo-thermal power station containing heat accumulation scheduling cost model
(1) foundation of photo-thermal power station and fired power generating unit integrated distribution model
Comprehensively consider the environmental benefit and operation expense, system rotation of the grid-connected consumption of fired power generating unit cost of electricity-generating, photo-thermal power generation
Turn spare capacity cost, establish photo-thermal power generation and fired power generating unit economic optimum combines power output scheduling model：
E=min [E1-E2+E3+E4] (1)
Wherein：Overall cost when E is photo-thermal power station networking operation；E1For fired power generating unit cost of electricity-generating；E2For photo-thermal power generation environment
Benefit；E3For system reserve capacity cost；E4For the operation expense of photo-thermal power generation；
Photo-thermal power generation is grid-connected will cause larger impact to the operation of power grid, can change going out for fired power generating unit to meet dispatching requirement
Power size and plan for start-up and shut-down；The cost of electricity-generating E of fired power generating unit1Fuel cost and start-up and shut-down costs including unit, are calculated as (2)
Formula：
E1=e1(Pi)+e2(ui) (2)
Wherein：e1For fuel cost；e2For start-up and shut-down costs；PiFor the generated output of fired power generating unit i；uiFor the operation of fired power generating unit i
State；
e1Be calculated as (3) formula：
e2Be calculated as (4) formula：
Wherein：PitFor unit i the t period generated output；uitFor unit i the t period operating status；SiFor unit i
Start-up cost；ai, bi, ciFor the fuel cost coefficient of unit i；N is the quantity of fired power generating unit；T is total period；When t is
It carves；I is i-th of unit；
The grid-connected generated energy that can reduce fired power generating unit of photo-thermal power generation reduces coal consumption and reaches so that the discharge amount of pollutant be effectively reduced
To the purpose of environmental protection, photo-thermal power generation environmental benefit E at this time2Be calculated as (5) formula：
Wherein：PiGtFor photo-thermal power station i the t period output power；kGThe environmental benefit coefficient for being photo-thermal power generation after grid-connected；M is
The quantity of grid-connected photo-thermal power station；
To guarantee safe operation of power system, certain spare capacity need to be reserved to cope with load prediction error, and burst thing
Therefore system reserve capacity needs certain cost；Since photo-thermal power generation has certain randomness, it will cause stand-by cost
Increase, at this time system reserve cost E3Be calculated as (6) formula：
Wherein：UitFor unit i t moment positive rotation spare capacity；DitFor unit i t moment negative spinning reserve capacity；
RitFor unit i t moment emergency reserve capacity；αiFor the positive rotation stand-by cost coefficient of unit i；βiFor the negative rotation of unit i
Turn stand-by cost coefficient；γiFor the emergency duty cost coefficient of unit i；
Since photo-thermal power station needs some necessary heat-preserving equipments and maintenance measure in the process of running, in the same of power generation
When can generate certain operation expense, the operation expense E of photo-thermal power generation4Be calculated as (7) formula：
Wherein：kisFor the operation expense coefficient of photo-thermal power station i；For the electromotive power output of t moment photo-thermal power station；
The output power of photo-thermal power station is codetermined by the thermal power of heat collector and heat reservoir, therefore, the hair of photo-thermal power station
Electrical power is calculated as (8) formula：
Wherein：ηdFor conversion efficiency of thermoelectric；For the thermal power of t moment heat collector；For heat-storing device t moment storage
Thermal power；For heat-storing device t moment heat release power；ηcHeat loss rate is filled for heat reservoir；ηfFor heat reservoir
Heat release loss late；
(2) system operation constraint
Ignore via net loss, the sum of fired power generating unit and photo-thermal power station output power are balanced with load power, are calculated as (9) formula：
Wherein：PLtFor the load power of t period；
Positive and negative spinning reserve capacity when operation of power networks is constrained to (10) formula：
Wherein：UiFor the positive rotation spare capacity of fired power generating unit i；DiFor the negative spinning reserve capacity of fired power generating unit i；PimaxFor fire
The maximum output of motor group i；PiminFor the minimum load of fired power generating unit i；ruiIt climb ratio of slope for the maximum of unit i；rdiFor machine
The maximum rate of climbing downwards of group i；L is load prediction error rate；
Units limits when fired power generating unit starting and stoppage in transit are (11) formula：
Synchronization, heat accumulation cannot carry out simultaneously with heat release, be (12) formula：
To meet the needs of next scheduling slot, heat reservoir one dispatching cycle whole story quantity of heat storage remain unchanged, be
(13) formula：
Wherein：For the initial value of heat reservoir quantity of heat storage in dispatching cycle；For heat reservoir quantity of heat storage in dispatching cycle
End value；
Photo-thermal power station units limits are (14) formula：
PGmin≤PGt≤PGmax (14)
Wherein：PGmaxFor the maximum output of photo-thermal power station；PGminFor the minimum load of photo-thermal power station；PGtIt is photo-thermal power station in the t period
Output power；
3) determination of photo-thermal power generation and fired power generating unit combined dispatching value
Fired power generating unit and photo-thermal power station power output are encoded, initial population is generated, is selected, intersected, the operations such as variation form filial generation
Population determines progeny population fitness, and the parent population low with the high progeny population substitution fitness of fitness；Fitness is most
High parent population directly remains into progeny population, the minimum progeny population of substitution fitness；Judge whether to meet termination condition,
If so, being decoded operation, the output power of fired power generating unit and photo-thermal power station is obtained；Otherwise it selected, intersected again, become
Different equal operation exports optimal value until meeting termination condition.
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