CN105226649B - One kind predicting improved provincial power network power generation dispatching optimization method based on bus load - Google Patents
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Abstract
The present invention provides a kind of based on the improved provincial power network power generation dispatching optimization method of bus load prediction, which comprises bus load prediction is divided into pure load bus prediction and ground tune unit output；The power output adjustable extent of the adjusted unit of each ground collection of property abroad collection；It carries out WARD equivalence and unit information and information on load is subjected to equivalent reduction；Ground tuning, which saves to adjust, reports equivalent unit information and duty value information；Saving to adjust always waits value informations to integrate each ground collection of property abroad, constructs scheduling model；It saves and adjusts using equivalent unit and straight tune unit as optimized variable, solve security constraint Unit Combination or Economic Dispatch Problem, obtain the exchange power planning for directly adjusting unit output plan with saving to be associated with substation；It saves to adjust and collects various regions tune Dispatch Plan information, judge whether various regions tune all meets regional network load balance, if all met, publication is executed.The present invention improves safe operation of electric network and dispatches the configuration level of resource.Model building method is simple, and it is convenient to solve.
Description
Technical field
The invention belongs to dispatching automation of electric power systems technical fields, and in particular to one kind is improved based on bus load prediction
Provincial power network power generation dispatching optimization method.
Background technique
Regional unit will play significant role in Future Power System, and still, area power grid is in addition to the adjustable unit in part
Except, it further include a large amount of unadjustable power supply (including distributed generation resource), and unconditional in the power system cannot make
With, only in the case that the condition that meets some technological constraints and, competence exertion its economic function, environmental performance.In addition, these
Unit can bring many problems and challenge to the normal operation and stability of electric system while making the most of the advantage.Therefore, needle
The specific method of bad problem is researched and solved in adverse effect to regional power to electric system, is realized regional unit, is saved tune machine
The combined optimization control of group, playing regional unit has important practical application value to the supplement advantage of conventional electric power system.
In prior art, provincial power network and area power grid work out administrative machine unit scheduling plan respectively, for provincial electricity
For net, bus load is predicted generally based on 220KV (330KV) node, by what is mounted under 110KV and following voltage class
Ground tune unit is dissolved into bus load prediction as load, and this subnetwork model is not exclusively load, therefore also just difficult
To reflect the true power output plan of these units, cause bus load precision of prediction not high, the out-of-limit erroneous judgement of Yi Yinqi trend, together
When can not efficiently use the regulating power of the adjustable unit of junior's power grid in generation schedule optimization, and to be used as network security out-of-limit
Control means.Therefore, what bus load was predicted is not allowed to cause the safety of provincial power network security constraint power generation dispatching planning optimization
Property, provincial dispatching unit and ground adjust unit can not economy and safety coordination.
For the above reasons, it is desirable to provide a kind of provincial power network power generation dispatching optimization side for considering regional power grid scheduling plan
Method, bus load forecast quality used, improves the safety of provincial power network the whole network planning when improving provincial power network optimization
Property；And realize that provincial power network directly adjusts the mutually coordinated and mutual support of unit and area power grid unit, improve the whole network economy water
It is flat.Realize distributing rationally for the whole province's generation assets.
Summary of the invention
To overcome above-mentioned the deficiencies in the prior art, the present invention proposes a kind of based on the improved provincial power network of bus load prediction
Power generation dispatching optimization method classifies bus load prediction, is divided into pure load bus load prediction and bus junior power grid
Unit output plan is accessed, pure load bus prediction predicts that the power generation of bus junior power grid access unit goes out using conventional method
Using WARD equivalent method, accurately equivalent reduction forms to respective bus bars the equivalent unit of adjustable range of contributing to power range, will be female
Line equivalence unit and provincial power network directly adjust unit together as optimized variable, establish operation plan decision model, carry out model and ask
The available straight tune unit output plan for fully considering security constraint and equivalence unit output plan are solved, and then according to equal check-ins
Group power output plan, determines the power output plan of regional power grid scheduling unit.This method is in traditional provincial power network power generation dispatching model
Only increase a small amount of decision variable and constraint condition, modeling is simple, and it is convenient to solve.
Realize solution used by above-mentioned purpose are as follows:
One kind predicting that improved provincial power network power generation dispatching optimization method, the optimization method include: based on bus load
Step 1: bus load prediction is divided into pure load bus prediction and ground tune unit output two parts；Step 2: each ground collection of property abroad
Collect the power output prediction or power output adjustable extent of adjusted unit；Step 3: carry out WARD equivalence by unit information and information on load into
Row equivalence reduction；Step 4: ground tuning, which saves to adjust, reports equivalent unit information and duty value information；It will be each Step 5: saving tune
Ground collection of property abroad always integrated by equal value informations, constructs scheduling model；It adjusts Step 6: saving using equivalent unit and straight tune unit as optimization
Variable solves security constraint Unit Combination or Economic Dispatch Problem, obtains that unit output plan is directly adjusted with saving to be associated with substation
Exchange power planning；Step 7: various regions tune is associated with substation's exchange power planning with executing the province, and solve this area
Safety economy scheduling problem adjusts unit output plan with obtaining；
Step 8: various regions tune adjusts whether unit output plan meets regional network load balance with judging, if conditions are not met,
Equivalent generator parameter is corrected, step 4 is gone to；If it is satisfied, going to step 9；
Various regions tune Dispatch Plan information is collected Step 9: saving and adjusting, judges whether various regions tune all meets regional network load
Balance, if all met, publication is executed.
Preferably, the area power grid is connected by substation with tune power grid is saved, by area power grid in the power transformation being connected
The high-pressure side progress WARD that stands is equivalent.
Preferably, the duty value information is equivalence value of the load of ground level power grid after WARD is equivalent；
The equivalence unit information includes: generator output bound, generator creep speed, generator cost curve.
Further, in the step 5, the scheduling model are as follows:
In formula, T indicates decision-making period；Gr indicates the equivalent generating set set that r-th of area power grid is included, and Gd is indicated
Save straightening tune unit set；Indicate r-th of area power grid equivalence generating set i in the power output of t period；It is r-th
Area power grid equivalence unit i is in power outputUnder cost of electricity-generating；Indicate that provincial power network directly adjusts unit k going out in the t period
Power；The unit k is directly adjusted to be in power output for provincial power networkUnder cost of electricity-generating；Directly to adjust unit k opening in the t period
Stop state；For the starting expense for directly adjusting unit k；Decision variable is that the power output of regional power grid equivalence unit and the whole network are directly adjusted
The start and stop and power output of unit；
Constraint condition includes power system security constraints, equivalent Unit commitment, directly adjusts Unit commitment；
The power system security constraints include: system power balance, system positive and negative spare, association the substation safety limit, line
Road tidal current limit, the section tidal current limit；
The equivalence Unit commitment includes: equivalent unit output bound constraint, equivalent unit ramp loss, equivalent unit
The sum of the constraint of the sum of power output, equivalent unit climbing constraint；
The straight tune Unit commitment includes: straight tune unit output bound constraint, straight tune unit ramp loss and directly adjusts machine
The start and stop constraint of group.
Compared with the latest prior art, technical solution provided by the invention has the advantages that
The bus load prediction of provincial power network is divided into pure load bus and predicts to connect low-voltage-grade with bus by the present invention
The equivalent influence two parts of power grid unit at bus, wherein the prediction of pure load bus is predicted using conventional method, bus junior
Accurately equivalent reduction forms the equivalent unit that power output range is adjusted to respective bus bars to the generated output range of power grid access unit,
Bus load prediction can more reflect practical operation situation, and precision of prediction is higher.
The present invention by bus load predict in hide the schedulable resource of junior's power grid safety and economic support potentiality dig
Excavate and, turn to equivalent unit and be introduced into provincial power network power generation dispatching Optimization Decision Models, obtain meeting all kinds of operations constraints and
The unit start-stop state and unit output plan that security constraint requires.It has sufficiently excavated and has saved ground two-level scheduler resource in the whole province's power grid
The coordination of electric network security economy to be supported, it is contemplated that the collaboration of the different scheduling institution units of operation of power networks optimizes benefit,
It improves safe operation of electric network and dispatches the configuration level of resource.Model building method is simple, and it is convenient to solve.
Detailed description of the invention
Fig. 1 is province of the invention ground cooperative scheduling planning process.
Specific embodiment
A specific embodiment of the invention is described in further detail with reference to the accompanying drawing.
To realize the information exchange between the superior and the subordinate's scheduling, the quality of bus load prediction is improved, bus load is predicted to save
The association transformer station high-voltage side bus information that point namely province harmonically adjust is as coordination variable.In most provincial power network, it is provincial and it is regional with
220KV (or 330KV) transformer adjusts the boundary (being all illustrated by taking 220KV as an example below) of ground tune, provincial power network side as saving
Boundary association 220KV plant stand main transformer high-pressure side, using the main transformer high-pressure side of 220KV plant stand as etc. value nodes.
Save the model coordination mode between ground tune are as follows: each department power grid adjusts power grid to be connected by substation with province, will be regional
Power grid carries out Equivalent Network in junction, can be important by ground tune or be related to the low guarantor's electric line of safety margin, transformer, section
Point and the network informations such as trans-regional interconnection and node retain, and eliminate internal node, only retain substation's associated nodes, in power grid
The physics law in portion can be reflected by the equal value nodes retained.Be connected on each equal value nodes one it is equivalent
Generator, and with the equivalent load generated through Equivalent Network, it thus can get accurate network tide model, realize accurate
Interconnection trend calculates.Save ground two-level scheduler plan equivalence coordination mode are as follows: ground tuning, which saves to adjust, reports the value nodes such as present networks
Information, the generator parameter connected including equal value nodes and the load for waiting value nodes.It saves and adjusts with substation's contact electrical connection respectively
Ground level power grid carries out the equivalent node after Equivalent Network, with the whole network purchases strategies or the minimum target of coal consumption, waits value nodes with each
The equivalent generator output of connection and straight tune unit output are decision variable, formulate the Zhi Tiao power plant scheduling meter for meeting security constraint
It draws and is associated with substation's exchange power.
The load of equal value nodes is equivalence value of the load of ground level power grid after Equivalent Network, each hair for waiting value nodes connection
Electric unit parameter are as follows: generator output bound, generator creep speed, generator quotation/cost curve.Each equivalence generator
Power output is limited to the upper and lower bound for making ground level dispatching of power netwoks plan have the sum of unit output in the area of feasible solution up and down, in precision
In lower situation, can contribute the check-ins such as the sum of unit output upper limits all in area conduct the upper limit, unit output in area
The sum of lower limit is as equivalent unit output lower limit.In area unit climbing power output the sum of as etc. check-ins climbing.Equal check-ins
Quotation/cost curve is equivalent purchases strategies/coal consumption curve of corresponding association substation's tie point.
It transfers for province, by the cost of electricity-generating information extraction that ground tune is total, is included in entirety and carries out unified optimization, realize
The scheduling of the whole province's economic optimization when saving adjusting concern target inconsistent, can be passed over the target of ground tune by equivalent unit,
The target of coordinated scheduling is realized by constraint method of relaxation: the model that the regulation goal of each department is added to province's tune as constraint is worked as
In, and relax to the constraint；The slack of target is adjusted to be punished over the ground with a biggish penalty factor in objective function
It penalizes.As long as penalty factor is larger, so that it may under the premise of preferentially contentedly adjusting target, realize that the unification of the whole province's target is excellent
Change.It transfers for ground, target is mainly Optimized Operation, and objective function is to minimize purchases strategies, and ensure guarantor's electric line
And the safety margin of equipment.The targets such as economy energy saving pass through the compression transmitting of the cost information of equivalent unit, in target letter
It is embodied in number, to realize and save the coordination that tune and other ground are adjusted.Safety be province adjust top-priority target, due to electricity
Force system trend by generate electricity, the distribution of load and network topology parameters are influenced, need to meet power flow equation.Then trend side
Journey is of overall importance, the coordination calculating between the scheduling of Yao Shixian the superior and the subordinate, it is necessary to realize the coordination of network model.By being based on
The network model of WARD equivalence, which extends, to be realized.
The specific implementation of network model extension based on WARD equivalence, the ground tune unit in the case where waiting value nodes are divided
Class processing:
1) power supply of 110kv or less substation mounting, classifying type shunt domain packing prediction, and are combined with and declare ability electricity
The situation of declaring stood is predicted；
2) the adjustable output of power station range (or plan) and the prediction of non-dimmable power supply of 110kv are accessed；
3) by preceding two result equivalences reduction (WORD is equivalent) to 220kv substation, 220kv bus load prediction=reduction
The bus prediction of value+pure load.
Equivalent power grid will be sent out after WARD Equivalent Network simplifies, by the generator in equivalent power grid by allocation matrix
In electrical characteristics reflection to boundary node, it is equivalent to boundary node in this way and is connected to an equivalent generator, equivalent generator ginseng
Number is equally anti-also by allocation matrix by equivalent grid nodes load by being determined by the collective effect of each generator of equivalent power grid
It reflects on boundary node, the load of boundary node is known as duty value, and each equal value nodes generator parameter and boundary node are equivalent
Load can be solved by allocation matrix.
By node inject it is active be expressed as each node generator output and node load, have:
Formula (1) indicates the relationship that equivalent boundary node is assigned to by each node generator power of equivalent power grid, is not power generation
The zero padding of machine node.Formula (2) indicates the relationship that each equivalent boundary node is assigned to by each node load of equivalent power grid.
Assuming that node i is a to the distribution factor of boundary node j, then equivalence is saved to boundary when node i unit output is P
The power of point j is just aP, similarly for the minimax power output p of node imax、pminThe equivalent power to boundary node j is just
apmaxAnd apmin.If power output of the node i unit in t the and t+1 period is respectively pt、pt+1, and pt+1-pt=Δ pt,t+1, indicate two
Climbing between period is Δ pt,t+1, the power output to the power of boundary node j in t the and t+1 period equivalent at this time is respectively apt、
apt+1, the climbing of corresponding equivalence to boundary node j can be expressed as ap at this timet+1-apt=a (pt+1-pt)=a Δ pt,t+1,
Then when it is Δ p that maximum climbing, which occurs, in the node i unit period, reflect that the climbing to boundary node j just becomes a Δ p, this is also side
Maximum climbing of the reflection of boundary's node i to boundary node j.
The information on load of each equal value nodes is obtained using allocation matrix, meanwhile, by each generating set of equivalent power grid on each side
The relations of distribution on boundary's node are obtained also by allocation matrix, and superposition, which solves, can be obtained the equivalent generator unit output upper limit, are climbed
Slope rate.
Referring to attached drawing 1, method the following steps are included:
Step 1: ground tune unit information is collected: the power output prediction or power output adjustable extent of the adjusted unit of each ground collection of property abroad collection；
Unit information and information on load are subjected to equivalent reduction Step 2: carrying out WARD equivalence；
Step 3: ground tuning, which saves to adjust, reports equivalent unit information and duty value information；
Always value informations is waited to integrate each ground collection of property abroad Step 4: saving and adjusting, building considers the whole province's economic power system and peace
The scheduling model of full property；
It adjusts Step 5: saving using equivalent unit and straight tune unit as optimized variable, solves security constraint Unit Combination or warp
Ji scheduling problem；Obtain the exchange power planning for directly adjusting unit output plan with saving to be associated with substation；
Step 6: various regions tune, which executes the exchange power planning of ground association substation, province, solves the peace of this area on this basis
Full Economic Dispatch Problem adjusts unit output plan with obtaining；
Step 7: various regions tune judges whether optimum results meet regional network load balance, if conditions are not met, amendment is equivalent
Generator parameter goes to step 3；
Various regions tune Dispatch Plan information is collected Step 8: saving and adjusting, whether comprehensive descision various regions tune restrains, if meeting convergence
Condition meets publication and executes.
In above-mentioned equivalent coordination process, main coordination variable (information interacted) between mode transfer type and ground level model is saved
Main includes that equivalent unit information and most relevant substation exchange power.Become mostly by 220KV (or 330KV) due to saving ground
Power station association, therefore the quantity for being associated with substation is little, and only interaction is primary for data, therefore the data in solution procedure are handed over
It changes that amount efficiency is higher, is sufficient for requiring under current communication condition.
Under the premise of guaranteeing system safety operation, with the total purchases strategies of system (or other targets) at least for target,
The startup-shutdown plan of unit is reasonably arranged in determining research cycle, is established and is saved tune degree planning model, Optimized model:
In formula, T indicates decision-making period；Gr indicates the equivalent generating set set that r-th of area power grid is included, and Gd is indicated
Save straightening tune unit set；Indicate r-th of area power grid equivalence generating set i in the power output of t period；It is r-th
Area power grid equivalence unit i is in power outputUnder cost of electricity-generating；Indicate that provincial power network directly adjusts unit k going out in the t period
Power；The unit k is directly adjusted to be in power output for provincial power networkUnder cost of electricity-generating；Directly to adjust unit k in the t period
Start and stop state；For the starting expense for directly adjusting unit k；Decision variable is that the power output of regional power grid equivalence unit and the whole network are directly adjusted
The start and stop and power output of unit；
Constraint condition:
Constraint condition includes power system security constraints, equivalent Unit commitment, directly adjusts Unit commitment.The power system security constraints packet
It includes: system power balance, system positive and negative spare, association the substation safety limit, the Line Flow limit, the section tidal current limit；
The equivalence Unit commitment includes: equivalent unit output bound constraint, equivalent unit ramp loss, equivalent unit
The sum of the constraint of the sum of power output, equivalent unit climbing constraint；
The straight tune Unit commitment includes: straight tune unit output bound constraint, straight tune unit ramp loss and directly adjusts machine
The start and stop constraint of group.
System power balance:
Unit output summation is necessarily equal to the whole network load in prepared operation plan.
In formula, DtFor t period the whole network load.
System is positive and negative spare:
In formula, G is the whole network unit,It is just spare for t period system,It is born for t period system spare.
The Line Flow limit:
The operation plan of formulation must satisfy the Line Flow limit as defined in secured fashion.
In formula, Lk,tFor route k the t period effective power flow；For the direct limit of route k；For the reversed of route k
The limit；L0For line set.
The section tidal current limit:
The operation plan that the whole network is formulated must satisfy the section tidal current limit as defined in secured fashion.
In formula, Sk,tFor section k the t period effective power flow；For the direct limit of section k；For the reversed of section k
The limit；M is section set.
It is associated with the substation safety limit:
In formula, Xi,tTo be associated with substation i in the trend of t period；To be associated with substation's direct limit；Become for association
Power station inverse limit；N is associated with substation's set between provincial power grid.
It is straight to adjust unit constraint:
It is straight to adjust the constraint of unit output bound:
The prepared plan of unit output in the works must be between the power output bound that unit allows.
In formula,Directly to adjust the unit k power output upper limit；Directly to adjust unit k power output lower limit.
Straight to adjust unit ramp loss, the straight power output for adjusting unit adjacent two period must satisfy the unit climbing limit.
In formula, Δ pkIndicate that the straight climbing for adjusting unit k within a period goes up and down limiting value.
The straight start and stop constraint for adjusting unit:
In formula:Directly to adjust maximum allowable start-stop time of the unit k within dispatching cycle；WithRespectively unit i
Downtime duration and booting duration in period t；WithWhen the minimum that respectively unit i allows continuously is stopped transport
Between and minimum continuous operating time.
Equivalent Unit commitment:
Equivalent unit output bound constraint:
Equivalent unit output plan must be between the power output bound that it allows.
In formula,For the area power grid r equivalence unit i power output upper limit；For area power grid r equivalence unit i power output
Lower limit.
Equivalent unit ramp loss:
The power output of equivalent unit adjacent two period must satisfy the equivalent unit climbing limit.
In formula,Indicate that climbing of the area power grid r equivalence unit i within a period goes up and down limiting value.
The constraint of the sum of equivalent unit output:
The sum of all equivalence unit outputs should be less than the sum of power output upper limit of all units in area in the power grid of areal；
The sum of all equivalence unit outputs should be greater than the power output lower limit of a certain setting in the power grid of areal.
pr.maxAnd pr,minFor the power output bound of all equivalent units of area power grid r.
The sum of equivalent unit climbing constraint
In the power grid of areal the sum of the difference of power output of all equivalence unit adjacent two periods should be less than in the area in it is organic
Group climbing rises the sum of limit and is greater than the sum of all unit climbing drop limit in area.
ΔprIndicate the total climbing limit of area power grid r.
Finally it should be noted that: above embodiments are merely to illustrate the technical solution of the application rather than to its protection scopes
Limitation, although the application is described in detail referring to above-described embodiment, those of ordinary skill in the art should
Understand: those skilled in the art read the specific embodiment of application can still be carried out after the application various changes, modification or
Person's equivalent replacement, but these changes, modification or equivalent replacement, are applying within pending claims.
Claims (4)
1. one kind predicts improved provincial power network power generation dispatching optimization method based on bus load, which is characterized in that
The optimization method includes:
Step 1: bus load prediction is divided into pure load bus prediction and ground tune unit output；
Step 2: the power output prediction or power output adjustable extent of the adjusted unit of each ground collection of property abroad collection；
Step 3: unit information and information on load are carried out the reduction of WARD equivalence；
Step 4: ground tuning, which saves to adjust, reports equivalent unit information and duty value information；
Collection of property abroad total equal value informations in each ground are integrated Step 5: saving and adjusting, building scheduling model；
It adjusts unit as optimized variable with straight equivalent unit Step 6: saving and adjusting, solves security constraint Unit Combination or economic tune
Degree problem obtains the exchange power planning for directly adjusting unit output plan with saving to be associated with substation；
Step 7: various regions tune is associated with substation's exchange power planning with executing the province, and solve the safety economy tune of this area
Degree problem adjusts unit output plan with obtaining；
Step 8: various regions tune adjusts whether unit output plan meets regional network load balance with judging, if conditions are not met, amendment
Equivalent generator parameter, goes to step 4；If it is satisfied, going to step 9；
Various regions tune Dispatch Plan information is collected Step 9: saving and adjusting, judges whether various regions tune all meets regional network load balance,
If all met, publication is executed.
2. optimization method as claimed in claim l, which is characterized in that the area power grid passes through substation and provincial power network phase
Even, area power grid is subjected to WARD equivalence in the substation high-pressure side being connected.
3. optimization as claimed in claim l has method, which is characterized in that the duty value information is that the load of ground level power grid passes through
Equivalence value after WARD is equivalent；
The equivalence unit information includes: generator output bound, generator creep speed, generator cost curve.
4. optimization method as claimed in claim l, which is characterized in that in the step 5, the scheduling model are as follows:
In formula, T indicates decision-making period；Gr indicates the equivalent generating set set that r-th of area power grid is included, and Gd is indicated to save and be adjusted
It is straight to adjust unit set；Indicate r-th of area power grid equivalence generating set i in the power output of t period；For r-th of area
Network equivalence unit i is in power outputUnder cost of electricity-generating；Indicate that provincial power network directly adjusts unit k in the power output of t period；The unit k is directly adjusted to be in power output for provincial power networkUnder cost of electricity-generating；Directly to adjust unit k in the start and stop of t period
State；For the starting expense for directly adjusting unit k；Decision variable is that the power output of regional power grid equivalence unit and the whole network directly adjust unit
Start and stop and power output；
Constraint condition includes power system security constraints, equivalent Unit commitment, directly adjusts Unit commitment；
The power system security constraints include: system power balance, positive and negative spare, the association substation safety limit of system, route tide
Flow the limit, the section tidal current limit；
The equivalence Unit commitment includes: equivalent unit output bound constraint, equivalent unit ramp loss, equivalent unit output
The sum of the sum of constraint, the climbing of equivalent unit constraint；
The straight tune Unit commitment includes: straight tune unit output bound constraint, straight tune unit ramp loss and straight tune unit
Start and stop constraint.
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| CN106712006A (en) * | 2017-01-12 | 2017-05-24 | 中国电力科学研究院 | Safety constraint economic dispatching method and system |
| CN109977444B (en) * | 2017-12-28 | 2020-09-25 | 广东电网有限责任公司电力调度控制中心 | Bus load prediction data correction method for power generation plan optimization |
| CN111864736B (en) * | 2020-07-22 | 2022-11-01 | 中国电力科学研究院有限公司 | Controllable load hierarchical control method and system coordinated by master station and slave station and storage medium |
| CN113364011B (en) * | 2021-06-30 | 2022-07-12 | 广东电网有限责任公司 | New energy secondary frequency modulation method, device and equipment |
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