CN113034174A - User-side shared energy storage power station optimal configuration method and system - Google Patents
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Abstract
The invention provides a user side shared energy storage power station optimal configuration method and system, and relates to the technical field of intelligent power grids. The method comprises the following steps: obtaining the supply P of the user side i to the shared energy storage at the time tch,i(t) and the required quantity Pdis,i(t); according to Pch,i(t) and Pdis,i(t) calculating the total supply amount omega of each user side at the time tS(t) and total demand ΩD(t); according to ΩS(t) and ΩD(t), calculating the actual total supply quantity omega 'of the shared energy storage power station at the time t'S(t) and actual total demand Ω'D(t); according to omega'S(t) and Ω'DAnd (t) controlling the shared energy storage power station to provide the shared energy storage service for each user side. The method and the system enable users to uniformly schedule and maintain the stored energyThe side can use the shared energy storage resources of the power grid level at any time, any place and according to needs, better energy storage service is provided for the user side, the cost of providing the energy storage service can be obviously reduced, the income is improved, and the social welfare maximization is realized.
Description
Technical Field
The invention relates to the technical field of smart power grids, in particular to a user-side shared energy storage power station optimal configuration method and system.
Background
With the increasingly severe environmental problems of exhaustion of fossil energy, global warming and the like, the prior development and utilization of renewable energy sources such as wind energy, solar energy and the like has important significance for changing the energy structure of China, ensuring the energy safety and improving the energy efficiency. Under the background, two core concepts that fossil energy is replaced by clean energy on the power supply side, and other energy is replaced by electric energy on the consumption side are provided, and two specific measures that electricity replaces coal, oil and clean electricity from a distance are provided, and the purposes of improving the proportion of electric energy consumed at the terminal, promoting new energy consumption, ensuring energy supply safety and solving the problem of environmental pollution are two alternatives. However, the large-scale incorporation of distributed energy sources such as wind power generation and photovoltaic power generation with volatility and uncertainty leads to aggravation of frequency fluctuation of a power grid, and even influences safe and stable operation of the power grid. And the charge-discharge characteristic of the energy storage system can perform space-time translation on energy, so that peak clipping and valley filling are realized to a certain extent. Therefore, the power system is provided with the energy storage system, the operating pressure brought to the system by new energy grid connection is effectively solved, and the system which is almost rigid originally becomes flexible. The energy space-time transfer can be realized, the flexibility of the system is enhanced, however, the large-scale application of the energy space-time transfer is limited due to the high cost of the energy space-time transfer, and the application of the stored energy on the user side is limited due to the different power utilization behaviors of different types of user sides.
Disclosure of Invention
The invention aims to provide a user side shared energy storage power station optimal configuration method and system, which can enable a user side to use grid-level shared energy storage resources at any time, any place and as required by uniformly scheduling and maintaining energy storage, provide better energy storage service for the user side, remarkably reduce the cost of providing the energy storage service, improve the profit and maximize the social welfare.
Embodiments of the invention may be implemented as follows:
in a first aspect, the present invention provides a method for optimally configuring a shared energy storage power station on a user side, where the method includes:
obtaining the supply P of the user side i to the shared energy storage at the time tch,i(t) and the required quantity Pdis,i(t)；
According to the supply amount Pch,i(t) and the required quantity Pdis,i(t) calculating the total supply amount omega of each user side at the time tS(t) and total demand ΩD(t)；
According to the total supply omegaS(t) and total demandΩD(t), calculating the actual total supply quantity omega 'of the shared energy storage power station at the time t'S(t) and actual total demand Ω'D(t)；
According to the actual total supply quantity omega'S(t) and actual total demand Ω'DAnd (t) controlling the shared energy storage power station to provide the shared energy storage service for each user side.
In an alternative embodiment, the total feed amount ΩS(t) and total demand ΩDThe formula for calculation of (t) is:
in the formula, N is the total number of the user sides; Δ t is the time interval.
In an alternative embodiment, the total feed amount ΩS(t) and total demand ΩD(t), calculating the actual total supply quantity omega of the shared energy storage power station'S(t) and actual total demand Ω'D(t) comprises:
when omega is higher thanS(t)≥ΩD(t) actual total supply amount Ω'S(t) and actual total demand Ω'DThe formula for calculation of (t) is:
in an alternative embodiment, the total feed amount ΩS(t) and total demand ΩD(t), calculating the actual total supply quantity omega of the shared energy storage power station'S(t) and actual total demand Ω'D(t) comprises:
when omega is higher thanS(t)<ΩD(t) actual total supply amount Ω'S(t) and actual total demand Ω'DThe formula for calculation of (t) is:
in an alternative embodiment, the method further comprises:
the capacity configuration model of the shared energy storage has maximum profit as an objective function, wherein the capacity configuration model is expressed as:
max f1＝Cuser+Cgov-Cgrid-CC
in the formula (f)1To share the revenue of the energy storage power station; cgridThe cost of purchasing electricity from the power grid for the shared energy storage power station; cuserService fees paid by the energy storage power station are laterally shared by the users; cgovSubsidizing the government for expenses; cCInvestment and construction cost of the shared energy storage power station.
In an alternative embodiment, the cost C of purchasing electricity from the grid is shared between the energy storage power stationsgridThe calculation formula of (2) is as follows:
in the formula, Pgrid(t) the electricity purchasing cost of the shared energy storage power station from the power grid; t is the number of the scheduling period time segments; mu.suserAnd (t) paying service fee to the shared energy storage power station at the moment t for the user side.
In an optional embodiment, the user shares the service fee C paid by the energy storage power station laterallyuserThe calculation formula of (2) is as follows:
in the formula, muuser(t) paying service fee to the shared energy storage power station at the moment t for the user side; and T is the number of the scheduling period time.
In an alternative embodiment, the government subsidy cost CgovThe calculation formula of (2) is as follows:
in the formula, mugovGovernment subsidies for charging the electric quantity for unit energy storage; q (t) is the total charge of the shared energy storage power station at the moment t; and T is the number of the scheduling period time.
In an alternative embodiment, the energy storage power station investment construction costs C are sharedCThe calculation formula of (2) is as follows:
CC＝Cinv+Cop
in the formula, Cinv、CopThe investment cost and the operation and maintenance cost of the shared energy storage power station are respectively.
In a second aspect, the invention provides a shared energy storage power station optimal configuration system on a user side, which comprises a controller, wherein the controller is used for acquiring the supply quantity P of the user side i to shared energy storage at the time tch,i(t) and the required quantity Pdis,i(t); according to the supply amount Pch,i(t) and the required quantity Pdis,i(t) calculating the total supply amount omega of each user side at the time tS(t) and total demand ΩD(t); according to the total supply omegaS(t) and total demand ΩD(t), calculating the actual total supply quantity omega 'of the shared energy storage power station at the time t'S(t) and actual total demand Ω'D(t); according to the actual total supply quantity omega'S(t) and actual total demand Ω'DAnd (t) controlling the shared energy storage power station to provide the shared energy storage service for each user side.
The method and the system for optimally configuring the shared energy storage power station at the user side have the advantages that:
the method and the system consider the supply amount P of different types of user sides to the shared energy storagech,i(t) and the required quantity Pdis,i(t) calculating the total supply quantity omega of each user side at the time t by combining the sharing economic thinkingS(t) and total demand ΩD(t) total supply quantity Ω of the user side if not of the typeS(t) greater than total demand ΩD(t), if the total charge-discharge requirement of the user side is discharge, the energy storage power station is shared to store the redundant electric quantity of the user side, and if the total supply quantity omega of the user side is not usedS(t) less than total demand ΩD(t), the total charge-discharge requirement of the user side is chargingAnd the shared energy storage power station provides the electric quantity needed by the user side, so that the unified scheduling and the unified maintenance of the energy storage are realized, the user side can use the grid-level shared energy storage resources at any time and any place as required, better energy storage service is provided for the user side, the cost for providing the energy storage service can be obviously reduced, the benefit is improved, and the social welfare maximization is realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a flowchart of a shared energy storage power station optimal configuration method on a user side according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
In the embodiment, a shared economic thinking mode is used for reference, a shared energy storage mode is provided, the deep fusion of the energy flow and the information flow in the same scale is realized, and the operation cost is reduced, and the specific technical scheme is as follows.
Referring to fig. 1, the present embodiment provides a method for optimally configuring a shared energy storage power station on a user side (hereinafter, referred to as "method"), where the method includes:
s1: obtaining the supply P of the user side i to the shared energy storage at the time tch,i(t) and the required quantity Pdis,i(t)。
Therefore, in the sharing mode, a plan for using shared energy storage is made based on the electricity utilization characteristics of the non-type user side, information and energy are exchanged among the non-type user side, the shared energy storage power station and the large power grid, and the electricity utilization condition of the non-type user side is obtained.
S2: according to the supply amount Pch,i(t) and the required quantity Pdis,i(t) calculating the total supply amount omega of each user side at the time tS(t) and total demand ΩD(t)。
Wherein, the total supply quantity omega of each user side at the time tS(t) and total demand ΩDThe formula for calculation of (t) is:
in the formula, N is the total number of the user sides; Δ t is the time interval.
S3: according to the total supply omegaS(t) and total demand ΩD(t), calculating the actual total supply quantity omega 'of the shared energy storage power station at the time t'S(t) and actual total demand Ω'D(t)。
Wherein when ΩS(t)≥ΩD(t), i.e., total supply amount Ω of the type-user-side-if-notS(t) is greater than or equal to the total demand ΩD(t) thenThe total charge-discharge demand of the user side is discharge, and the actual total supply quantity omega'S(t) and actual total demand Ω'DThe formula for calculation of (t) is:
when omega is higher thanS(t)<ΩD(t), i.e., total supply amount Ω of the type-user-side-if-notS(t) less than total demand ΩD(t), the total charge-discharge demand of the user side is charge, and the actual total supply quantity omega'S(t) and actual total demand Ω'DThe formula for calculation of (t) is:
s4: according to the actual total supply quantity omega'S(t) and actual total demand Ω'DAnd (t) controlling the shared energy storage power station to provide the shared energy storage service for each user side.
In particular, if the total supply omega on the subscriber side is not of the typeS(t) greater than total demand ΩD(t), if the total charge-discharge requirement of the user side is discharge, the energy storage power station is shared to store the redundant electric quantity of the user side, and if the total supply quantity omega of the user side is not usedS(t) less than total demand ΩDAnd (t), the total charge-discharge requirement of the user side is charging, and the shared energy storage power station provides the electric quantity still needed by the user side. The user side can use the complementarity of the power consumption behaviors of the user side at the moment, namely the power consumption behavior difference of the same user side in different time periods and different user sides in the same time period, so that the use requirement of the user side on the stored energy is met by the minimum stored energy, and the frequent charging and discharging of the shared stored energy are avoided.
The capacity configuration model of the shared energy storage has maximum profit as an objective function, wherein the capacity configuration model is expressed as:
max f1＝Cuser+Cgov-Cgrid-CC
in the formula (I), the compound is shown in the specification,f1to share the revenue of the energy storage power station; cgridThe cost of purchasing electricity from the power grid for the shared energy storage power station; cuserService fees paid by the energy storage power station are laterally shared by the users; cgovSubsidizing the government for expenses; cCInvestment and construction cost of the shared energy storage power station.
Wherein, the shared energy storage power station purchases the electricity from the power grid for a fee CgridThe calculation formula of (2) is as follows:
in the formula, Pgrid(t) the electricity purchasing cost of the shared energy storage power station from the power grid; t is the number of the scheduling period time segments; mu.suserAnd (t) paying service fee to the shared energy storage power station at the moment t for the user side.
Service fee C paid by user side direction sharing energy storage power stationuserThe calculation formula of (2) is as follows:
in the formula, muuser(t) paying service fee to the shared energy storage power station at the moment t for the user side; and T is the number of the scheduling period time.
Government subsidy fee CgovThe calculation formula of (2) is as follows:
in the formula, mugovGovernment subsidies for charging the electric quantity for unit energy storage; q (t) is the total charge of the shared energy storage power station at the moment t; and T is the number of the scheduling period time.
Shared energy storage power station investment construction cost CCThe calculation formula of (2) is as follows:
CC＝Cinv+Cop
in the formula, Cinv、CopInvestment costs for respectively sharing energy storage power stationsAnd operating and maintenance costs.
Calculating the actual total supply quantity omega 'of the shared energy storage power station at the moment t'S(t) and actual total demand Ω'DIn the process of (t), the following operational constraints are also satisfied:
(1) constraint of equality
∑Pgrid(t)+∑Pdis(t)＝PL(t)+∑Pch(t)
In the formula, PLAnd (t) is the load active power at the moment t.
(2) Power and state of charge constraints of the stored energy:
in the formula, PmaxThe maximum charge and discharge power is stored; SoC (t) is the state of charge at the moment of energy storage t; SoC (system on chip)min(t)、SoCmax(t) energy storage minimum and maximum states of charge, respectively.
Further, after the shared energy storage power station optimization configuration model on the user side can be converted into a mixed integer linear programming problem, a cplex12.8 tool is adopted to solve the problem, and a parete optimal leading edge solution is obtained.
The embodiment also provides a user-side shared energy storage power station optimal configuration system (hereinafter referred to as "system"), which comprises a controller, wherein the controller is used for acquiring the supply P of the user side i to the shared energy storage at the time tch,i(t) and the required quantity Pdis,i(t); according to the supply amount Pch,i(t) and the required quantity Pdis,i(t) calculating the total supply amount omega of each user side at the time tS(t) and total demand ΩD(t); according to the total supply omegaS(t) and total demand ΩD(t), calculating the actual total supply quantity omega 'of the shared energy storage power station at the time t'S(t) and actual total demand Ω'D(t); according to the actual total supply quantity omega'S(t) and actual total demand Ω'DAnd (t) controlling the shared energy storage power station to provide the shared energy storage service for each user side. That is, the systemFor performing the steps of the above method.
The method and the system for optimally configuring the shared energy storage power station at the user side have the advantages that:
the method and the system consider the supply amount P of different types of user sides to the shared energy storagech,i(t) and the required quantity Pdis,i(t) calculating the total supply quantity omega of each user side at the time t by combining the sharing economic thinkingS(t) and total demand ΩD(t) total supply quantity Ω of the user side if not of the typeS(t) greater than total demand ΩD(t), if the total charge-discharge requirement of the user side is discharge, the energy storage power station is shared to store the redundant electric quantity of the user side, and if the total supply quantity omega of the user side is not usedS(t) less than total demand ΩD(t), the total charge-discharge requirement of the user side is charging, the shared energy storage power station provides the electric quantity needed by the user side, and further unified scheduling and maintenance of energy storage are realized, so that the user side can use the grid-level shared energy storage resources at any time and any place as required, better energy storage service is provided for the user side, the cost of providing the energy storage service can be obviously reduced, the benefit is improved, and the social welfare maximization is realized.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A user side shared energy storage power station optimal configuration method is characterized by comprising the following steps:
obtaining the supply P of the user side i to the shared energy storage at the time tch,i(t) and the required quantity Pdis,i(t)；
According to the supply amount Pch,i(t) and the required quantity Pdis,i(t) calculating the total supply amount omega of each user side at the time tS(t) and total demand ΩD(t)；
According to the total supply quantity omegaS(t) and the total demand ΩD(t), calculating the actual total supply quantity omega 'of the shared energy storage power station at the time t'S(t) and actual total demand Ω'D(t)；
According to the actual total supply quantity omega'S(t) and the actual total demand Ω'DAnd (t) controlling the shared energy storage power station to provide shared energy storage service for each user side.
2. The user-side shared energy storage power station optimal configuration method according to claim 1, characterized in that the total supply amount ΩS(t) and the total demand ΩDThe formula for calculation of (t) is:
in the formula, N is the total number of the user sides; Δ t is the time interval.
3. The method as claimed in claim 2, wherein the method is based on the total supply amount ΩS(t) and the total demand ΩD(t), calculating the actual total supply quantity omega of the shared energy storage power station'S(t) and actual total demand Ω'D(t) comprises:
when omega is higher thanS(t)≥ΩD(t), the actual total supply amount Ω'S(t) and the actual total demand Ω'DThe formula for calculation of (t) is:
4. the method as claimed in claim 2, wherein the method is based on the total supply amount ΩS(t) and the total demand ΩD(t), calculating the actual total supply quantity omega of the shared energy storage power station'S(t) and actual total demand Ω'D(t) comprises:
when omega is higher thanS(t)<ΩD(t), the actual total supply amount Ω'S(t) and the actual total demand Ω'DThe formula for calculation of (t) is:
5. the user-side shared energy storage power station optimal configuration method according to claim 1, characterized in that the method further comprises:
the capacity configuration model of the shared energy storage has maximum profit as an objective function, wherein the capacity configuration model is expressed as:
maxf1＝Cuser+Cgov-Cgrid-CC
in the formula (f)1To share the revenue of the energy storage power station; cgridThe cost of purchasing electricity from the power grid for the shared energy storage power station; cuserService fees paid by the energy storage power station are laterally shared by the users; cgovSubsidizing the government for expenses; cCInvestment and construction cost of the shared energy storage power station.
6. The user-side optimal configuration method for the shared energy storage power station as claimed in claim 5, wherein the cost C of purchasing electricity from the power grid of the shared energy storage power stationgridThe calculation formula of (2) is as follows:
in the formula, Pgrid(t) the electricity purchasing cost of the shared energy storage power station from the power grid; t is the number of the scheduling period time segments; mu.suserAnd (t) paying service fee to the shared energy storage power station at the moment t for the user side.
7. The method of claim 5, wherein the service fee C paid by the user side to the shared energy storage power station isuserThe calculation formula of (2) is as follows:
in the formula, muuser(t) paying service fee to the shared energy storage power station at the moment t for the user side; and T is the number of the scheduling period time.
8. The method of claim 5 wherein the user-side shared energy storage power plant is configured for a government subsidy cost CgovThe calculation formula of (2) is as follows:
in the formula, mugovGovernment subsidies for charging the electric quantity for unit energy storage; q (t) is the total charge of the shared energy storage power station at the moment t; and T is the number of the scheduling period time.
9. The optimal configuration method for the user-side shared energy storage power station as claimed in claim 5, wherein the investment and construction cost C of the shared energy storage power stationCThe calculation formula of (2) is as follows:
CC＝Cinv+Cop
in the formula, Cinv、CopThe investment cost and the operation and maintenance cost of the shared energy storage power station are respectively.
10. The system is characterized by comprising a controller, wherein the controller is used for acquiring the supply quantity P of a user side i to shared energy storage at the moment tch,i(t) and the required quantity Pdis,i(t); according to the supply amount Pch,i(t) and the required quantity Pdis,i(t) calculating the total supply amount omega of each user side at the time tS(t) and total demand ΩD(t); according to the total supply quantity omegaS(t) and the total demand ΩD(t), calculating the actual total supply quantity omega 'of the shared energy storage power station at the time t'S(t) and actual total demand Ω'D(t); according to the actual total supply quantity omega'S(t) and the actual total demand Ω'DAnd (t) controlling the shared energy storage power station to provide shared energy storage service for each user side.
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