CN112260300B - Method and device for determining energy storage configuration and optimal delay period - Google Patents
Method and device for determining energy storage configuration and optimal delay period Download PDFInfo
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Abstract
The invention discloses a method and a device for determining energy storage configuration and optimal delay life of delayed power distribution network reconstruction, wherein the method comprises the following steps: acquiring a 24-hour load characteristic curve of a maximum load day of a planned horizontal year, the maximum transmission capacity of a power distribution network, the energy storage charging efficiency and discharging efficiency and the life cycle of an energy storage system; determining rated charge-discharge power and capacity of the energy storage system; determining an energy storage charging and discharging strategy, calculating the annual cost and benefit of the energy storage system in the whole life cycle under the charging and discharging strategy, and calculating the annual cumulative benefit cost ratio of energy storage; and determining the optimal year of the energy storage system for delaying the transformation of the power distribution network according to the accumulated benefit-cost ratio of the energy storage year by year and giving the maximum benefit generated by the system after the energy storage is installed.
Description
Technical Field
The invention relates to the technical field of power system planning, in particular to a method and a device for determining energy storage configuration and optimal delay time limit for delaying power distribution network transformation.
Background
With the large-scale access of new energy to the distribution network, the influence of the new energy to the distribution network cannot be ignored. The access of the stored energy can effectively relieve the fluctuation and uncertainty of the new energy output, and meanwhile, the transformation and the upgrading of the power distribution network can be effectively delayed.
In the prior art, in various methods for installing an energy storage delay power distribution network, the determination of energy storage power and capacity is mainly performed according to a load characteristic curve in a given year, the problem of maximizing the benefit of an installed energy storage system in the whole life cycle of the installed energy storage system is not considered from the perspective of an energy storage system owner, and meanwhile, the optimal delay period of energy storage cannot be given.
Disclosure of Invention
The invention aims to provide a method and a device for determining energy storage configuration and optimal delay time for delaying power distribution network transformation, and aims to solve the problems in the prior art.
The invention provides a method for determining energy storage configuration and optimal delay life for delaying power distribution network reconstruction, which comprises the following steps:
acquiring a 24-hour load characteristic curve of a maximum load day of a planned horizontal year, the maximum transmission capacity of a power distribution network, the energy storage charging efficiency and discharging efficiency and the life cycle of an energy storage system;
determining rated charge and discharge power and capacity of the energy storage system according to a load characteristic curve of 24 hours of a maximum load day of a planned horizontal year, the maximum transmission capacity of a power distribution network and the energy storage discharge efficiency;
determining an energy storage charging and discharging strategy, calculating the annual cost and benefit of the energy storage system in the whole life cycle under the charging and discharging strategy according to the energy storage charging efficiency and the discharging efficiency and the life cycle of the energy storage system, and calculating the annual cumulative benefit-cost ratio of the energy storage;
and determining the optimal year of the energy storage system for delaying the transformation of the power distribution network according to the accumulated benefit-cost ratio of the energy storage year by year and giving the maximum benefit generated by the system after the energy storage is installed.
The invention provides a device for determining energy storage configuration and optimal delay life for delaying power distribution network reconstruction, which comprises:
the acquisition module is used for acquiring a 24-hour load characteristic curve of a maximum load day of a planned horizontal year, the maximum transmission capacity of a power distribution network, the energy storage charging efficiency and discharging efficiency and the life cycle of an energy storage system;
the first calculation module is used for determining rated charge-discharge power and capacity of the energy storage system according to a load characteristic curve of 24 hours of a maximum load day of a planned horizontal year, the maximum transmission capacity of a power distribution network and the energy storage discharge efficiency;
the second calculation module is used for determining an energy storage charging and discharging strategy, calculating the annual cost and benefit of the energy storage system in the whole life cycle under the charging and discharging strategy according to the energy storage charging efficiency and the discharging efficiency and the life cycle of the energy storage system, and calculating the accumulated annual benefit-cost ratio of the energy storage;
and the third calculation module is used for determining the optimal year of the energy storage system capable of delaying the transformation of the power distribution network according to the annual cumulative benefit-cost ratio of the energy storage and giving the maximum benefit generated by the system after the energy storage is installed.
By adopting the embodiment of the invention, the optimal configuration of the energy storage power and the capacity is carried out from the perspective of maximizing the benefit of an energy storage system owner, and the optimal delay life of a given power distribution network is given. The optimal configuration of the energy storage power and capacity is determined by planning the horizontal year load characteristics, the comprehensive benefits of the energy storage in the whole life cycle in the process of delaying the upgrading and reconstruction of the power distribution network can be considered, and the maximum exertion of the energy storage value is facilitated.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a method for delaying energy storage configuration and determining an optimal delay period for power distribution network transformation according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an energy storage configuration for delaying power distribution network transformation and an apparatus for determining an optimal delay period according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Method embodiment
According to an embodiment of the present invention, a method for determining an energy storage configuration and an optimal delay period for delaying power distribution network transformation is provided, fig. 1 is a flowchart of a method for determining an energy storage configuration and an optimal delay period for delaying power distribution network transformation according to an embodiment of the present invention, and as shown in fig. 1, the method for determining an energy storage configuration and an optimal delay period for delaying power distribution network transformation according to an embodiment of the present invention specifically includes:
step 101, acquiring a 24-hour load characteristic curve of a maximum load day of a planned horizontal year, the maximum transmission capacity of a power distribution network, energy storage charging efficiency and discharging efficiency, and the life cycle of an energy storage system;
102, determining rated charge and discharge power and capacity of an energy storage system according to a load characteristic curve of 24 hours of a maximum load day of a planned horizontal year, the maximum transmission capacity of a power distribution network and energy storage and discharge efficiency;
step 102 specifically includes the following processing:
according to a 24-hour load characteristic curve P of a planned horizontal annual maximum load day load ＝{L 1 ,L 2 ,…,L k ,…,L 24 Calculating the maximum value P of 24 hours of the maximum load day of the planning horizontal year load,max ＝max{L 1 ,L 2 ,…,L k ,…,L 24 }；
Will P load,max Maximum transmission capacity S of power distribution network max Making a comparison if S max ≥P load,max Rated charging and discharging power P of energy storage system ESS 0, capacity E ESS 0; if S max <P load,max Then calculate P load -S max ＝{δ P1 ,δ P2 ,…,δ Pk ,…,δ P24 Get { delta }, get P1 ,δ P2 ,…,δ Pk ,…,δ P24 Larger than or equal to 0 in the set is taken as a new set P P ＝{P 1 ,P 2 ,…,P M }, doMaximum charging power P of constant energy storage chmax ＝max{P 1 ,P 2 ,…,P M }; less than 0 is marked as a new set P N ＝{N M+1 ,N M+2 ,…,N 24 Determining the maximum energy storage discharge power P dischmax ＝max{|N M+1 |,|N M+2 |,…,|N 24 I, where M + N is 24; calculating rated charge-discharge power P of energy storage system ESS ＝max{P chmax ,P dischmax }; the discharge electric quantity of the energy storage system in the day is used as the capacity E of the energy storage system ESS I.e. by
Wherein e is disch The energy storage discharge efficiency is improved.
103, determining an energy storage charging and discharging strategy, calculating the annual cost and benefit of the energy storage system in the whole life cycle under the charging and discharging strategy according to the energy storage charging efficiency and discharging efficiency and the life cycle of the energy storage system, and calculating the annual cumulative benefit-cost ratio of the energy storage;
step 103 specifically includes the following processing:
step 1, determining an energy storage charging and discharging strategy as an intra-day peak clipping and valley filling strategy; specifically, in the process of using the energy storage system for delaying the upgrading and reconstruction of the power distribution network, an energy storage charging and discharging strategy is generally determined to be an intra-day peak load shifting strategy, namely a control strategy of energy storage charging at a load valley period and energy storage discharging at an intra-day load peak period;
step 2, according to the initial investment cost C of the energy storage system cap Annual fixed operation and maintenance cost C fix And annual change operation and maintenance cost C var And annual financial cost C fin Calculating annual cost C of energy storage system year (ii) a The step 2 specifically comprises the following steps:
based on formula 1, according to rated charge-discharge power P of the energy storage system ESS And capacity E ESS Calculating initial investment cost C of energy storage system cap ：
C cap ＝0.861×P ESS 0.7678 +1.123×E ESS 0.94661 Formula 1;
based on formula 2, according to the rated charge-discharge power P of the energy storage system ESS Calculating annual fixed operation and maintenance cost C fix ：
C fix ＝α×P ESS Formula 2;
wherein, the parameter alpha is determined by different energy storage technologies according to actual conditions;
based on equation 3, according to the capacity E of the energy storage system ESS Determining annual change operation and maintenance cost C var ：
C var ＝β×E ESS Formula 3;
wherein, the parameter beta is determined to be valued by different energy storage technologies according to actual conditions;
based on formula 4, according to the bank loan amount W, loan interest r and loan year N year And discount rate d determining annual financial cost C fin ：
Calculating the annual cost C of the energy storage system according to a formula 5 year ：
Step 3, according to the transformer investment and installation cost B saved by installing the stored energy xfm Distribution network line transformation cost B reduced due to installation of energy storage line Energy storage annual income B ESS Calculating annual revenue B of energy storage system year (ii) a The step 3 specifically comprises the following steps:
based on formula 6, according to the rated charge-discharge power P of the energy storage system ESS Calculating the Transformer investment and installation costs B saved by installing the stored energy xfm ：
B xfm ＝γ×P ESS Equation 6;
wherein, the parameter gamma represents the initial investment, transportation and installation cost corresponding to the unit capacity of the transformer;
based on formula 7, the transformation cost B of the power distribution network circuit reduced by the installation of the energy storage is calculated according to the unit cost and the length of the circuit line ：
B line ＝λ×L len Equation 7;
wherein the parameter lambda represents a nominal delivery capacity P ESS Initial investment, transportation and installation costs corresponding to the unit capacity of the transmission line; l is len Representing the length of the transmission line;
calculating the annual energy storage income B according to a formula 8 ESS ：
Wherein the parameter P in,t 、P out,t Respectively showing the stored energy electricity purchase price and the electricity sale price, e ch And e disch Respectively representing the charging efficiency and the discharging efficiency of the energy storage system;
calculating the yearly income B of the energy storage system according to a formula 9 year ：
Step 4, according to the life cycle of the energy storage system and the annual cost C of the energy storage system year And the energy storage system earnings B year by year year And calculating the annual accumulated benefit-cost ratio of the stored energy. Step 4 specifically comprises the following steps:
and calculating the annual accumulated benefit-cost ratio of the stored energy according to a formula 10:
wherein the parameter T represents the energy storage system life cycle.
And step 104, determining the optimal year of the energy storage system for delaying the transformation of the power distribution network according to the annual accumulated benefit-cost ratio of the energy storage and giving the maximum benefit generated by the system after the energy storage is installed.
Step 104 specifically includes:
calculating the annual cumulative benefit-cost ratio r of the stored energy in T years year To find the maximum value r max ＝max{r year 1,2, …, T;
determining the year T corresponding to the maximum value m ；
Calculating the time period T according to equation 11 m Maximum revenue generated by the internal energy storage system:
in summary, the embodiments of the present invention provide an optimal configuration of energy storage power and capacity from the perspective of maximizing the benefits of energy storage system owners, and provide an optimal delay life for a given distribution network. The optimal configuration of the energy storage power and the capacity is determined by planning the load characteristics of the horizontal year, the comprehensive benefits of the energy storage in the whole life cycle in the process of delaying the upgrading and the reconstruction of the power distribution network can be considered, and the maximum exertion of the energy storage value is facilitated.
System embodiment
According to an embodiment of the present invention, a device for determining an energy storage configuration and an optimal delay period for delaying power distribution network transformation is provided, fig. 2 is a schematic diagram of a device for determining an energy storage configuration and an optimal delay period for delaying power distribution network transformation according to an embodiment of the present invention, as shown in fig. 2, the device for determining an energy storage configuration and an optimal delay period for delaying power distribution network transformation according to an embodiment of the present invention specifically includes:
the acquiring module 20 is configured to acquire a planned horizontal year maximum load 24-hour daily load characteristic curve, a maximum transmission capacity of the power distribution network, energy storage charging efficiency and discharging efficiency, and a life cycle of the energy storage system;
the first calculation module 22 is configured to determine rated charge and discharge power and capacity of the energy storage system according to a planned horizontal year maximum load daily 24-hour load characteristic curve, the maximum transmission capacity of the power distribution network, and the energy storage discharge efficiency;
the first calculating module 22 is specifically configured to:
according to a 24-hour load characteristic curve P of a planned horizontal annual maximum load day load ＝{L 1 ,L 2 ,…,L k ,…,L 24 Calculating the maximum value P of 24 hours of the maximum load day of the planning horizontal year load,max ＝max{L 1 ,L 2 ,…,L k ,…,L 24 }；
Will P load,max Maximum transmission capacity S of power distribution network max Making a comparison if S max ≥P load,max Rated charging and discharging power P of energy storage system ESS 0, capacity E ESS 0; if S max <P load,max Then calculate P load -S max ＝{δ P1 ,δ P2 ,…,δ Pk ,…,δ P24 Get { delta }, get P1 ,δ P2 ,…,δ Pk ,…,δ P24 Larger than or equal to 0 in the set is taken as a new set P P ＝{P 1 ,P 2 ,…,P M Determining the maximum charging power P of stored energy chmax ＝max{P 1 ,P 2 ,…,P M }; less than 0 is marked as a new set P N ＝{N M+1 ,N M+2 ,…,N 24 Determining the maximum energy storage discharge power P dischmax ＝max{|N M+1 |,|N M+2 |,…,|N 24 I, where M + N is 24; calculating rated charge and discharge power P of energy storage system ESS ＝max{P chmax ,P dischmax }; the discharge electric quantity of the energy storage system in the day is used as the capacity E of the energy storage system ESS I.e. by
Wherein e is disch The energy storage discharge efficiency;
the second calculation module 24 is configured to determine an energy storage charging and discharging strategy, calculate the yearly cost and benefit of the energy storage system in the full life cycle of the energy storage system under the charging and discharging strategy according to the energy storage charging efficiency and the discharging efficiency, and calculate a cumulative benefit-to-cost ratio of the energy storage yearly;
the second calculating module 24 is specifically configured to:
determining an energy storage charging and discharging strategy as an intra-day peak clipping and valley filling strategy;
according to the initial investment cost C of the energy storage system cap Annual fixed operation and maintenance cost C fix And annual change operation and maintenance cost C var And annual financial cost C fin Calculating year-by-year cost C of energy storage system year (ii) a Specifically, based on equation 1, the rated charge-discharge power P of the energy storage system is used ESS And capacity E ESS Calculating initial investment cost C of energy storage system cap ：
C cap ＝0.861×P ESS 0.7678 +1.123×E ESS 0.94661 Formula 1;
based on formula 2, according to the rated charge-discharge power P of the energy storage system ESS Calculating annual fixed operation and maintenance cost C fix ：
C fix ＝α×P ESS Formula 2;
wherein, the parameter alpha is determined by different energy storage technologies according to actual conditions;
based on equation 3, according to the capacity E of the energy storage system ESS Determining annual change operation and maintenance cost C var ：
C var ＝β×E ESS Formula 3;
the parameter beta is determined by different energy storage technologies according to actual conditions;
based on formula 4, according to the bank loan amount W, loan interest r and loan year N year And discount rate d determining annual financial cost C fin ：
Calculating the annual cost C of the energy storage system according to the formula 5 year ：
According to the stored energy due to installationSaved transformer investment and installation cost B xfm Distribution network line transformation cost B reduced due to installation of energy storage line Energy storage annual income B ESS Calculating annual revenue B of energy storage system year (ii) a Specifically, based on equation 6, according to the rated charge and discharge power P of the energy storage system ESS Calculating the transformer investment and installation cost B saved by installing the stored energy xfm ：
B xfm ＝γ×P ESS Equation 6;
wherein, the parameter gamma represents the initial investment, transportation and installation cost corresponding to the unit capacity of the transformer;
based on formula 7, the transformation cost B of the power distribution network circuit reduced by the installation of the energy storage is calculated according to the unit cost and the length of the circuit line ：
B line ＝λ×L len Equation 7;
wherein the parameter λ represents a rated transport capacity P ESS Initial investment, transportation and installation costs corresponding to unit capacity of the transmission line; l is len Representing the length of the transmission line;
calculating the annual energy storage income B according to a formula 8 ESS ：
Wherein the parameter P in,t 、P out,t Respectively showing the stored energy electricity purchasing price and the electricity selling price, e ch And e disch Respectively representing the charging efficiency and the discharging efficiency of the energy storage system;
calculating the yearly income B of the energy storage system according to a formula 9 year ：
According to the life cycle of the energy storage system and the annual cost C of the energy storage system year And the energy storage system earnings B year by year year Calculating the annual accumulated benefit cost of stored energyA ratio; in particular, the amount of the solvent to be used,
and calculating the annual accumulated benefit-cost ratio of the stored energy according to a formula 10:
wherein the parameter T represents the energy storage system life cycle.
And the third calculation module 26 is used for determining the optimal year that the energy storage system can delay the transformation of the distribution network according to the year-to-year accumulated benefit-cost ratio of the energy storage and giving the maximum benefit generated by the system after the energy storage is installed.
The third computing module is specifically configured to:
calculating the annual cumulative benefit-cost ratio r of the stored energy in T years year To find the maximum value r max ＝max{r year 1,2, …, T;
determining the year T corresponding to the maximum value m ；
Calculating the time period T according to equation 11 m Maximum revenue generated by the internal energy storage system:
the embodiment of the present invention is a system embodiment corresponding to the above method embodiment, and specific operations of each module may be understood with reference to the description of the method embodiment, which is not described herein again.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A method for determining energy storage configuration and optimal delay time limit for delaying power distribution network reconstruction is characterized by comprising the following steps:
acquiring a 24-hour load characteristic curve of a maximum load day of a planned horizontal year, the maximum transmission capacity of a power distribution network, the energy storage charging efficiency and discharging efficiency and the life cycle of an energy storage system;
determining rated charge and discharge power and capacity of the energy storage system according to a load characteristic curve of 24 hours of a maximum load day of a planned horizontal year, the maximum transmission capacity of a power distribution network and the energy storage discharge efficiency;
determining an energy storage charging and discharging strategy, calculating the annual cost and income of the energy storage system in the whole life cycle under the charging and discharging strategy according to the energy storage charging efficiency and discharging efficiency and the life cycle of the energy storage system, and calculating the annual accumulated income-cost ratio of the energy storage;
according to the energy storage annual accumulated profit-cost ratio, the optimal year of the energy storage system for delaying the transformation of the power distribution network is determined, and the maximum profit generated by the system after the energy storage is installed is given, and the method specifically comprises the following steps:
calculating the annual accumulated profit-cost ratio r of energy storage in T years year To find the maximum value r max ＝max{r year "wherein the parameter year represents year, year ═ 1,2, …, T;
determining maximum value correspondenceYear T m ；
Calculating the time period T according to equation 11 m Maximum benefit generated by the internal energy storage system:
wherein, B year And the energy storage system gains year by year.
2. The method according to claim 1, wherein the step of determining the rated charge and discharge power and capacity of the energy storage system according to the planned horizontal year maximum load daily 24-hour load characteristic curve, the maximum transmission capacity of the power distribution network and the energy storage discharge efficiency specifically comprises the following steps:
according to a 24-hour load characteristic curve P of a planned horizontal annual maximum load day load ＝{L 1 ,L 2 ,…,L k ,…,L 24 Calculating the maximum value P of 24 hours of the maximum load day of the planning horizontal year load,max ＝max{L 1 ,L 2 ,…,L k ,…,L 24 In which, { L } 1 ,L 2 ,…,L k ,…,L 24 Denotes the load values at 1 hour, 2 hour, k hour and 24 hour of the day of maximum load;
will P load,max Maximum transmission capacity S of power distribution network max Making a comparison if S max ≥P load,max Rated charging and discharging power P of energy storage system ESS 0, capacity E ESS 0; if S max <P load,max Then calculate P load- S max ＝{δ P1 ,δ P2 ,…,δ Pk ,…,δ P24 In which { delta } P1 ,δ P2 ,…,δ Pk ,…,δ P24 Respectively denote L 1 ,L 2 ,…,L k ,…,L 24 Subtract S max The difference value after the operation is taken as { delta P1 ,δ P2 ,…,δ Pk ,…,δ P24 Larger than or equal to 0 in the set is taken as a new set P P ＝{P 1 ,P 2 ,…,P M In which P is 1 ,P 2 ,…,P M Set of representations { δ P1 ,δ P2 ,…,δ Pk ,…,δ P24 The 1 st occurrence of an element equal to or greater than 0, the 2 nd occurrence of an element equal to or greater than 0, and the Mth occurrence of an element equal to or greater than 0 in sequence; m represents the set { δ } P1 ,δ P2 ,…,δ Pk ,…,δ P24 The total number of elements greater than or equal to 0 in the element; determining the maximum charging power P of the stored energy chmax ＝max{P 1 ,P 2 ,…,P M }; less than 0 is marked as a new set P N ＝{N M+1 ,N M+2 ,…,N 24 In which N is M+1 ,N M+2 ,…,N 24 Set of representations { δ P1 ,δ P2 ,…,δ Pk ,…,δ P24 Determining the maximum discharge power P of stored energy according to the sequence of the element less than 0 appearing at the 1 st time, the element less than 0 appearing at the 2 nd time and the element less than 0 appearing at the (24-M) th time dischmax ＝max{|N M+1 |,|N M+2 |,…,|N 24 L, wherein l N M+1 |,|N M+2 |,…,|N 24 I represents the element N M+1 ,N M+2 ,…,N 24 M + N is 24; calculating rated charge-discharge power P of energy storage system ESS ＝max{P chmax ,P dischmax }; the discharge electric quantity of the energy storage system in the day is used as the capacity E of the energy storage system ESS I.e. by
Wherein e is disch For energy storage discharge efficiency, j represents the set P N ＝{N M+1 ,N M+2 ,…,N 24 Numbering the elements in the (J), wherein the value of j is M +1, M +2, … and 24; | N j Is the set { | N | M+1 |,|N M+2 |,…,|N 24 The element numbered j in | }.
3. The method according to claim 1, wherein the determining of the energy storage charging and discharging strategy, the calculating of the annual cost and the income of the energy storage system in the whole life cycle under the charging and discharging strategy according to the energy storage charging efficiency and the discharging efficiency and the life cycle of the energy storage system, and the calculating of the accumulated annual income-cost ratio of the energy storage specifically comprises:
determining an energy storage charging and discharging strategy as an intra-day peak clipping and valley filling strategy;
according to the initial investment cost C of the energy storage system cap Annual fixed operation and maintenance cost C fix And annual change operation and maintenance cost C var And annual financial cost C fin Calculating annual cost C of energy storage system year ；
Based on the saved investment and installation cost B of the transformer due to the installation of stored energy xfm Distribution network line transformation cost B reduced due to installation of energy storage line Energy storage annual income B ESS Calculating annual revenue B of energy storage system year ；
According to the life cycle of the energy storage system and the annual cost C of the energy storage system year And the energy storage system earnings B year by year year And calculating the annual accumulated profit-cost ratio of the stored energy.
4. A method according to claim 3, characterized in that the initial investment cost C in energy storage system is based on cap Annual fixed operation and maintenance cost C fix And annual change operation and maintenance cost C var And annual financial cost C fin Calculating annual cost C of energy storage system year The method specifically comprises the following steps:
based on formula 1, according to rated charge-discharge power P of the energy storage system ESS And capacity E ESS Calculating initial investment cost C of energy storage system cap ：
C cap ＝0.861×P ESS 0.7678 +1.123×E ESS 0.94661 Formula 1;
based on formula 2, according to the rated charge-discharge power P of the energy storage system ESS Calculating annual fixed operation and maintenance cost C fix ：
C fix ＝α×P ESS Formula 2;
wherein, the parameter alpha is determined by different energy storage technologies according to actual conditions;
based on formula 3According to the capacity E of the energy storage system ESS Determining annual change operation and maintenance cost C var ：
C var ＝β×E ESS Formula 3;
wherein, the parameter beta is determined to be valued by different energy storage technologies according to actual conditions;
based on formula 4, according to the bank loan amount W, loan interest r and loan year N year And discount rate d determining annual financial cost C fin ：
Calculating the annual cost C of the energy storage system according to a formula 5 year ：
5. Method according to claim 3, characterized in that the investment in transformers and the installation costs B are saved as a result of the installation of stored energy xfm Distribution network line transformation cost B reduced due to installation of energy storage line Energy storage annual income B ESS Calculating annual revenue B of energy storage system year The method specifically comprises the following steps:
based on formula 6, according to the rated charge-discharge power P of the energy storage system ESS Calculating the Transformer investment and installation costs B saved by installing the stored energy xfm ：
B xfm ＝γ×P ESS Equation 6;
wherein, the parameter gamma represents the initial investment, transportation and installation cost corresponding to the unit capacity of the transformer;
based on formula 7, the transformation cost B of the power distribution network circuit reduced by the installation of the energy storage is calculated according to the unit cost and the length of the circuit line ：
B line ＝λ×L len Equation 7;
wherein the parameter lambda represents a nominal delivery capacity P ESS Initial investment, transportation and installation costs corresponding to unit capacity of the transmission line; l is len Representing the length of the transmission line;
calculating the annual energy storage income B according to a formula 8 ESS ：
Wherein the parameter P in,t 、P out,t Respectively showing the stored energy electricity purchasing price and the electricity selling price, e ch And e disch Respectively representing the charging efficiency and the discharging efficiency of the energy storage system, wherein the parameter t represents a time mark of 8760 hours in a year;
calculating the yearly income B of the energy storage system according to a formula 9 year ：
6. A method according to claim 3, characterized in that the energy storage system cost per year C is dependent on the energy storage system life cycle year And the energy storage system earnings B year by year year The calculation of the annual accumulated profit-to-cost ratio of the stored energy specifically comprises the following steps:
and (3) calculating the annual accumulated profit-cost ratio of the stored energy according to a formula 10:
wherein, the parameter T represents the life cycle of the energy storage system, the parameter year represents the year, and the value is 1 to T.
7. An energy storage configuration and an optimal delay time limit determining device for delaying power distribution network transformation is characterized by comprising:
the acquisition module is used for acquiring a 24-hour load characteristic curve of a maximum load day of a planned horizontal year, the maximum transmission capacity of a power distribution network, the energy storage charging efficiency and discharging efficiency and the life cycle of an energy storage system;
the first calculation module is used for determining rated charge-discharge power and capacity of the energy storage system according to a planned horizontal year maximum load 24-hour daily load characteristic curve, the maximum power transmission capacity of the power distribution network and the energy storage discharge efficiency;
the second calculation module is used for determining an energy storage charging and discharging strategy, calculating the annual cost and income of the energy storage system in the whole life cycle under the charging and discharging strategy according to the energy storage charging efficiency and the discharging efficiency and the life cycle of the energy storage system, and calculating the annual and cumulative income-cost ratio of the energy storage;
the third calculation module is used for determining the optimal year of the energy storage system capable of delaying the transformation of the power distribution network according to the annual accumulated profit-cost ratio of the energy storage and giving the maximum profit generated by the system after the energy storage is installed; the third computing module is specifically configured to:
calculating the annual accumulated profit-cost ratio r of energy storage in T years year To find the maximum value r max ＝max{r year "wherein the parameter year represents year, year-1, 2, …, T;
determining the year T corresponding to the maximum value m ；
Calculating the time period T according to equation 11 m Maximum revenue generated by the internal energy storage system:
wherein, B year The energy storage system earns year by year.
8. The apparatus of claim 7, wherein the first computing module is specifically configured to:
according to the planned 24-hour load of the maximum annual loadCharacteristic curve P load ＝{L 1 ,L 2 ,…,L k ,…,L 24 Calculating the maximum value P of 24 hours of the maximum load day of the planning horizontal year load,max ＝max{L 1 ,L 2 ,…,L k ,…,L 24 }; wherein, { L } 1 ,L 2 ,…,L k ,…,L 24 Denotes the load values at 1 st hour, 2 nd hour, k th hour and 24 th hour of the maximum load day;
will P load,max Maximum transmission capacity S of power distribution network max Making a comparison if S max ≥P load,max Rated charging and discharging power P of energy storage system ESS 0, capacity E ESS 0; if S max <P load,max Then calculate P load- S max ＝{δ P1 ,δ P2 ,…,δ Pk ,…,δ P24 Wherein, δ P1 ,δ P2 ,…,δ Pk ,…,δ P24 Respectively represent L 1 ,L 2 ,…,L k ,…,L 24 Minus S max The difference value after the operation is taken as { delta P1 ,δ P2 ,…,δ Pk ,…,δ P24 Greater than or equal to 0 in the set as a new set P P ＝{P 1 ,P 2 ,…,P M In which P 1 ,P 2 ,…,P M Set of representations { δ P1 ,δ P2 ,…,δ Pk ,…,δ P24 The 1 st occurrence of an element equal to or greater than 0, the 2 nd occurrence of an element equal to or greater than 0, and the Mth occurrence of an element equal to or greater than 0 in sequence; m represents the set { δ } P1 ,δ P2 ,…,δ Pk ,…,δ P24 The total number of elements equal to or greater than 0 in the element group; determining the maximum charging power P of the energy storage chmax ＝max{P 1 ,P 2 ,…,P M }; less than 0 is marked as a new set P N ＝{N M+1 ,N M+2 ,…,N 24 In which N is M+1 ,N M+2 ,…,N 24 Set of representations { δ P1 ,δ P2 ,…,δ Pk ,…,δ P24 The 1 st occurrence of an element less than 0, the 2 nd occurrence of an element less than 0, and the (24-M) th occurrence of an element less than 0 in this order, doConstant energy storage maximum discharge power P dischmax ＝max{|N M+1 |,|N M+2 |,…,|N 24 L, where l N M+1 |,|N M+2 |,…,|N 24 I represents the element N M+1 ,N M+2 ,…,N 24 M + N is 24; calculating rated charge-discharge power P of energy storage system ESS ＝max{P chmax ,P dischmax }; the discharge electric quantity of the energy storage system in the day is used as the capacity E of the energy storage system ESS I.e. by
Wherein e is disch For energy storage discharge efficiency, j denotes the set P N ＝{N M+1 ,N M+2 ,…,N 24 Numbering the elements in the (J), wherein the value of j is M +1, M +2, … and 24; | N j L is a set { | N | M+1 |,|N M+2 |,…,|N 24 The element numbered j in | };
the second calculation module is specifically configured to:
determining an energy storage charging and discharging strategy as an intra-day peak clipping and valley filling strategy;
according to the initial investment cost C of the energy storage system cap Annual fixed operation and maintenance cost C fix And annual change operation and maintenance cost C var And annual financial cost C fin Calculating annual cost C of energy storage system year ；
Based on the saved investment and installation cost B of the transformer due to the installation of stored energy xfm Distribution network line transformation cost B reduced due to installation of energy storage line Energy storage annual income B ESS Calculating annual revenue B of energy storage system year ；
According to the life cycle of the energy storage system and the annual cost C of the energy storage system year And the energy storage system earnings B year by year year Calculating the annual accumulated profit-cost ratio of stored energy;
9. the apparatus of claim 8, wherein the second computing module is specifically configured to:
based on formula 1, according to rated charge-discharge power P of the energy storage system ESS And capacity E ESS Calculating initial investment cost C of energy storage system cap ：
C cap ＝0.861×P ESS 0.7678 +1.123×E ESS 0.94661 Formula 1;
based on formula 2, according to the rated charge-discharge power P of the energy storage system ESS Calculating annual fixed operation and maintenance cost C fix ：
C fix ＝α×P ESS Formula 2;
wherein, the parameter alpha is determined by different energy storage technologies according to actual conditions;
based on equation 3, according to the capacity E of the energy storage system ESS Determining annual change operation and maintenance cost C var ：
C var ＝β×E ESS Formula 3;
wherein, the parameter beta is determined to be valued by different energy storage technologies according to actual conditions;
based on formula 4, according to the bank loan amount W, loan interest r and loan year N year And discount rate d determining annual financial cost C fin ：
Calculating the annual cost C of the energy storage system according to the formula 5 year ：
Based on formula 6, according to the rated charge-discharge power P of the energy storage system ESS Calculating the Transformer investment and installation costs B saved by installing the stored energy xfm ：
B xfm ＝γ×P ESS Equation 6;
wherein, the parameter gamma represents the initial investment, transportation and installation cost corresponding to the unit capacity of the transformer;
based on formula 7, the transformation cost B of the power distribution network circuit reduced by the installation of the energy storage is calculated according to the unit cost and the length of the circuit line ：
B line ＝λ×L len Equation 7;
wherein the parameter λ represents a rated transport capacity P ESS Initial investment, transportation and installation costs corresponding to unit capacity of the transmission line; l is len The length of the transmission line is represented;
calculating the annual energy storage income B according to a formula 8 ESS ：
Wherein the parameter P in,t 、P out,t Respectively showing the stored energy electricity purchase price and the electricity sale price, e ch And e disch Respectively representing the charging efficiency and the discharging efficiency of the energy storage system, wherein the parameter t represents a time mark of 8760 hours in a year;
calculating the yearly income B of the energy storage system according to a formula 9 year ：
And (3) calculating the annual accumulated profit-cost ratio of the stored energy according to a formula 10:
wherein, the parameter T represents the life cycle of the energy storage system, the parameter year represents the year, and the value is 1 to T.
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