Installation scheme optimization method of energy storage element and related equipment

Abstract

The embodiment of the invention discloses an energy storage element installation scheme optimization method and related equipment, and the method comprises the steps: calculating the electricity price income of an energy storage system through obtaining the number of peak-valley effective days, the number of peak-valley effective days of a peak segment, the number of peak-average effective days of the energy storage system, and the number of peak-average effective days of the peak segment; the optimal solution is carried out based on the electricity price income, so that the optimal installation scheme of the energy storage element in the energy storage system is realized, and the difference between the peak-valley effective days and the peak-average effective days is fully considered; therefore, according to the obtained optimal installation scheme, the energy storage system still has optimal equipment capacity, power configuration and other parameters when facing different electricity price signals and load structures, so that the planning, optimization and operation efficiency of the energy storage system is ensured.

Description

[Technical field]

[0001] The present invention relates to the technical field of energy storage equipment planning, and in particular to an energy storage element installation scheme optimization method and related equipment. [Background technology]

[0002] With the rapid development of renewable energy power generation, the peak-valley difference and peak-level difference problems on the power load side are becoming increasingly prominent. As an important technology for power peak regulation and consumption of new energy power, the economic benefits of energy storage systems are closely related to the number of effective peak-valley days and peak-level effective days. Peak-valley effective days refer to the number of days when energy storage systems are used to alleviate peak-valley loads and smooth out electricity price fluctuations, while peak-level effective days refer to the number of days when energy storage systems are used to smooth out electricity prices during flat periods and improve load smoothness.

[0003] At present, the installation plan of energy storage system lacks targeted economic benefit analysis, and is usually determined based on single indicators such as capacity and power, which makes it difficult to fully consider the differences between effective days of peak and valley and effective days of peak and flat. This plan leads to misjudgment of parameters such as equipment capacity and power configuration of energy storage system when facing different electricity price signals and load structures, which in turn affects the planning, optimization and operation efficiency of energy storage system. [Summary of the invention]

[0004] In view of this, the present invention provides an energy storage element installation scheme optimization method and related equipment.

[0005] The specific technical scheme of the first embodiment of the present invention is: a method for optimizing the installation scheme of energy storage elements, the method comprising: obtaining the peak-to-valley effective days and the peak-to-valley effective days of the energy storage system according to the maximum charge and discharge power of the energy storage elements in the energy storage system, the discharge efficiency, the annual unabsorbed electricity of the energy storage system and the total unabsorbed electricity of the energy storage system; wherein the annual unabsorbed electricity is the annual unabsorbed electricity discharged during the peak-to-valley period; the total unabsorbed electricity is the total unabsorbed electricity discharged during the peak-to-valley period during the implementation of the peak electricity price; obtaining the peak-to-flat effective days and the peak-to-flat effective days of the energy storage system according to the maximum charge and discharge power of the energy storage elements in the energy storage system, the discharge efficiency, the discharged absorbed electricity of the energy storage system and the daily undercharged amount of the energy storage system; wherein In the above, the discharge and absorption power is the absorption power discharged by the energy storage system in the peak period before the normal period; the undercharged power is the undercharged power of the energy storage system affected by the user's power load in the normal period and the capacity or maximum demand of the user's transformer; the first electricity price benefit of the energy storage system using the peak-valley electricity price for power supply is obtained according to the peak-valley effective days and the peak-valley effective days; the second electricity price benefit of the energy storage system using the peak-flat electricity price for power supply is obtained according to the peak-to-normal effective days and the peak-to-normal effective days; the first electricity price benefit and the second electricity price benefit are used to perform optimal solution to obtain the optimal installation plan of the energy storage elements in the energy storage system; the optimal installation plan includes the capacity, quantity and target maximum charge and discharge power of the energy storage elements.

[0006] Preferably, the method of obtaining the peak-valley effective days and the peak-valley effective days of the energy storage system according to the maximum charge and discharge power, discharge efficiency, annual unabsorbed electricity of the energy storage system and total unabsorbed electricity of the energy storage system of the energy storage elements in the energy storage system includes: obtaining the charged amount of the energy storage system in normal times according to the maximum charge and discharge power and the undercharged amount of the energy storage system in normal times; obtaining the remaining electricity of the energy storage system according to the discharge duration of the energy storage system in different peak time periods, the absorbed electricity of the energy storage system per hour in the peak time period and the discharge efficiency; the remaining electricity is the remaining electricity after the peak time period absorbs the charged electricity of the valley time period; obtaining the peak-valley effective days and the peak-valley effective days according to the remaining electricity, the annual unabsorbed electricity, the total unabsorbed electricity and the charged amount of the energy storage system in normal times.

[0007] Preferably, the method of obtaining the peak-valley effective days and the peak-valley effective days according to the remaining power, the annual unconsumed power, the total unconsumed power, and the charged amount of the energy storage system in normal times includes: obtaining the unconsumed power of the energy storage system every day according to the charged amount of the energy storage system in normal times and the remaining power; obtaining the first equivalent uncharged days of the energy storage system in the peak-valley period of a year according to the unconsumed power and the number of days per year; obtaining the second equivalent uncharged days of the energy storage system in the peak-valley period during the peak electricity price period according to the unconsumed power and the number of days in a year when the energy storage system implements peak electricity prices; obtaining the second equivalent uncharged days of the energy storage system in the peak-valley period during the peak electricity price period according to the annual unconsumed power, the maximum charge and discharge power, and the energy storage system. The first equivalent not fully discharged days of the energy storage system are obtained based on the time period when the system is in the maximum charge and discharge state and the discharge efficiency; the first equivalent not fully discharged days are the days when the energy storage system is not fully discharged in a year; the second equivalent not fully discharged days of the energy storage system are obtained based on the total unabsorbed electricity, the maximum charge and discharge power, the time period when the energy storage system is in the maximum charge and discharge state, and the discharge efficiency; the second equivalent not fully discharged days are the days when the energy storage system is not fully discharged during the peak electricity price period in a year; the peak-valley effective days and the peak-valley effective days in the peak section are obtained based on the first equivalent not fully discharged days, the second equivalent not fully discharged days, the first equivalent not fully discharged days, and the second equivalent not fully discharged days.

[0008] Preferably, the method of obtaining the peak-valley effective days and the peak-section peak-valley effective days according to the first equivalent not-full days, the second equivalent not-full days, the first equivalent not-full days and the second equivalent not-full days includes: obtaining the peak-valley effective days by removing the first equivalent not-full days, the first equivalent not-full days and the shutdown days of the energy storage system from the number of days in a year; obtaining the peak-section peak-valley effective days by subtracting the second equivalent not-full days, the second equivalent not-full days and the shutdown days from the number of days in a year when the energy storage system implements peak electricity prices.

[0009] Preferably, the method of obtaining the peak-to-average effective days and the peak-to-average effective days of the energy storage system according to the maximum charge and discharge power, discharge efficiency, discharge absorption capacity of the energy storage system and the daily undercharge amount of the energy storage system of the energy storage elements in the energy storage system includes: obtaining the unabsorbed capacity of the energy storage system according to the maximum charge and discharge power, the discharge efficiency and the discharge absorption capacity; the unabsorbed capacity is the unabsorbed capacity in the peak period before the normal period; obtaining the peak-to-average effective days and the peak-to-average effective days of the energy storage system according to the unabsorbed capacity and the daily undercharge amount of the energy storage system.

[0010] Preferably, the method of obtaining the peak-to-average effective days and the peak-to-average effective days of the energy storage system according to the unabsorbed electricity and the daily undercharged amount of the energy storage system includes: obtaining the annual undercharged amount of the energy storage system in normal times and the undercharged amount of the energy storage system in normal times according to the unabsorbed electricity and the daily undercharged amount; the undercharged amount in normal times is the undercharged amount in normal times during the peak electricity price period; obtaining the first equivalent undercharged amount days and the second equivalent undercharged amount days according to the annual normal times and the normal times; the first equivalent undercharged amount days is the The equivalent number of days that the energy storage system is undercharged during the normal period of a year; the second equivalent number of days undercharged is the equivalent number of days that the energy storage system is undercharged during the normal period during the peak electricity price period; obtain the third equivalent number of days that the energy storage system is undercharged during the peak and normal periods of a year and the fourth equivalent number of days that the energy storage system is undercharged during the peak and normal periods during the peak electricity price period; obtain the peak-to-normal effective days and the peak-to-peak normal effective days according to the first equivalent number of days undercharged, the second equivalent number of days undercharged, the third equivalent number of days that the energy storage system is undercharged and the fourth equivalent number of days that the energy storage system is undercharged during the peak and normal periods during the peak electricity price period.

[0011] Preferably, the first electricity price benefit of the energy storage system using the peak-valley electricity price for power supply is obtained according to the peak-valley effective days and the peak-valley effective days, including: obtaining the peak-valley electricity price benefit of the energy storage system according to the maximum charging and discharging power, the period when the energy storage system is in the maximum charging and discharging state, the discharge efficiency, the peak period electricity price, the valley period electricity price, the peak-valley effective days and the peak-valley effective days and charging efficiency; obtaining the peak-valley implementation peak electricity price benefit of the energy storage system according to the first ratio, the maximum charging and discharging power, the period when the energy storage system is in the maximum charging and discharging state, the discharge efficiency, the peak period electricity price, the second ratio, the peak period electricity price, the valley period electricity price and the charging efficiency; the first ratio is the ratio of the peak period to the peak period and the peak period in a day, and the second ratio is the ratio of the peak period to the peak period and the peak period in a day; the first electricity price benefit is obtained by summing the peak-valley period electricity price benefit with the peak-valley implementation peak electricity price benefit.

[0012] The specific technical solution of the second embodiment of the present invention is: a system for optimizing the installation plan of an energy storage element, the system comprising: a first effective day acquisition module, a second effective day acquisition module, a first electricity price benefit acquisition module, a second electricity price benefit acquisition module and an installation plan output module; the first effective day acquisition module is used to obtain the peak-valley effective days and peak-valley effective days of the energy storage system according to the maximum charge and discharge power, discharge efficiency, annual unabsorbed electricity of the energy storage system and the total unabsorbed electricity of the energy storage system of the energy storage element in the energy storage system; wherein the annual unabsorbed electricity is the annual unabsorbed electricity discharged in the peak-valley period; the total unabsorbed electricity is the total unabsorbed electricity discharged in the peak-valley period during the implementation of the peak electricity price; the second effective day acquisition module is used to obtain the energy storage system according to the maximum charge and discharge power, discharge efficiency, discharge absorption electricity of the energy storage system and the daily undercharge of the energy storage system of the energy storage element in the energy storage system. The peak-to-flat effective days and the peak-to-flat effective days of the peak period; wherein, the discharge and absorption power is the absorption power discharged by the energy storage system in the peak period before the normal period; the undercharged power is the undercharged power of the energy storage system affected by the user's power load in the normal period and the capacity or maximum demand of the user's transformer; the first electricity price benefit acquisition module is used to obtain the first electricity price benefit of the energy storage system using the peak-to-valley electricity price for power supply according to the peak-to-valley effective days and the peak-to-valley effective days in the peak period; the second electricity price benefit acquisition module is used to obtain the second electricity price benefit of the energy storage system using the peak-to-flat electricity price for power supply according to the peak-to-flat effective days and the peak-to-flat effective days in the peak period; the installation plan output module is used to use the first electricity price benefit and the second electricity price benefit for optimal solution to obtain the optimal installation plan of the energy storage elements in the energy storage system; the optimal installation plan includes the capacity, quantity and target maximum charge and discharge power of the energy storage elements.

[0013] The specific technical solution of the third embodiment of the present invention is: an installation scheme optimization device for energy storage elements, including a memory and a processor, the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the method described in any one of the first embodiments of the present application.

[0014] The specific technical solution of the fourth embodiment of the present invention is: a computer-readable storage medium storing a computer program, characterized in that when the computer program is executed by a processor, the processor executes the steps of the method described in any one of the first embodiments of the present application.

[0015] Implementing the embodiments of the present invention will have the following beneficial effects:

[0016] The present invention calculates the electricity price benefit of the energy storage system by obtaining the peak-valley effective days, the peak-valley effective days, the peak-flat effective days and the peak-flat effective days of the energy storage system, and performs an optimal solution based on the electricity price benefit to obtain the optimal installation plan of the energy storage elements in the energy storage system, thereby fully considering the differences between the peak-valley effective days and the peak-flat effective days. The optimal installation plan obtained improves the energy storage system when facing different electricity price signals and load structures. It still has the optimal equipment capacity, power configuration and other parameters, thereby ensuring the planning, optimization and operation efficiency of the energy storage system.

Brief Description of the Drawings

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A flowchart of the steps of a method for optimizing an installation scheme of an energy storage element;

[0019] Figure 2 A schematic diagram of a system for optimizing the installation scheme of an energy storage element;

[0020] Among them, 201, the first effective days acquisition module; 202, the second effective days acquisition module; 203, the first electricity price benefit acquisition module; 204, the second electricity price benefit acquisition module; 205, the installation plan output module. [Specific implementation method]

[0021] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0022] The terms "first", "second", etc. in the specification, claims and drawings of this application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or modules is not limited to the listed steps or modules, but optionally includes steps or modules that are not listed, or optionally includes other steps or modules that are inherent to these processes, methods, products or devices.

[0023] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0024] Energy storage systems in different regions usually divide time periods according to power consumption intervals, such as the valley period is 00:00-08:00, the normal period is 12:00-14:00, the peak period is 10:00-12:00 and 14:00-19:00, and the peak period is 11:00-12:00 and 15:00-17:00. The charging time in the valley period is relatively sufficient and can basically guarantee full charging; the first peak period may not be fully consumed. After charging in the normal period, due to the low power consumption in the second peak period, it cannot be fully consumed, resulting in the inability to be fully charged during charging at night. The unconsumed electricity is equal to the undercharged electricity at night.

[0025] See also Figure 1 , is a flowchart of a method for optimizing the installation scheme of an energy storage element in the first embodiment of the present application, so as to ensure the planning, optimization and operation efficiency of the energy storage system, the method comprising:

[0026] Step 101: Based on the maximum charge and discharge power P of the energy storage element in the energy storage system bt , discharge efficiency EFF d 、The annual unconsumed electricity of the energy storage system E peakncon and the total unabsorbed electricity E of the energy storage system tippeakncon Obtain the peak and valley effective days D of the energy storage system pv The effective days of peak and valley sections D tippv ; Wherein, the annual unconsumed electricity is the annual unconsumed electricity discharged during the peak and valley periods; the total unconsumed electricity is the total unconsumed electricity discharged during the peak and valley periods during the implementation of the peak electricity price;

[0027] Step 102: Based on the maximum charge and discharge power P of the energy storage element in the energy storage system bt , discharge efficiency EFF d 、The discharge capacity of the energy storage system and the daily undercharge amount of the energy storage system Obtain the peak-average effective days D of the energy storage system pf The effective days of peak-to-peak section D tippf; Wherein, the discharge consumption amount is the consumption amount of the energy storage system discharged during the peak period before the normal period; the undercharge amount is the undercharge amount of the energy storage system affected by the user's power load during the normal period and the capacity or maximum demand of the user's transformer;

[0028] Step 103: According to the peak-valley effective days D pv and the effective number of days D for the peak and valley sections tippv Obtain the first electricity price income I of the energy storage system using the peak and valley electricity prices to supply electricity pv ,I tippv ;

[0029] Step 104: Obtain a second electricity price income I of the energy storage system using the peak-to-flat electricity price for power supply according to the peak-to-flat effective days and the peak-to-flat effective days. pf ,I tippf ;

[0030] Step 105: Utilize the first electricity price benefit and the second electricity price benefit to perform an optimal solution to obtain an optimal installation plan for energy storage elements in the energy storage system; the optimal installation plan includes the capacity, quantity, and target maximum charge and discharge power of the energy storage elements.

[0031] Specifically, the number of effective days in peak and valley refers to the number of days on which electricity consumption actually occurs during the specified peak and valley periods. These periods are usually divided according to the supply and demand conditions of the power grid and seasonal changes, aiming to encourage users to arrange their electricity consumption time reasonably and improve the utilization efficiency of power resources. The number of effective days in the peak section is more specific. It refers to the number of days on which electricity consumption actually occurs during the specified peak period (usually the peak period during the peak electricity consumption). The peak period is usually the time period when electricity demand is highest and the power grid is under the greatest pressure, such as the evening period in winter. The number of effective days in peak and flat periods refers to the number of days on which electricity consumption actually occurs and meets certain standards (such as electricity consumption reaches a certain threshold) during the specified peak and normal periods. The number of effective days in the peak section refers to the number of days on which electricity consumption actually occurs and meets certain standards during the specified peak period (usually the peak period during the peak period), combined with the normal period. The electricity price benefits corresponding to the effective peak-valley days and the effective peak-valley days in the peak section are obtained respectively to form a first electricity price benefit; the electricity price benefits of the effective peak-flat days and the effective peak-flat days in the peak section are obtained respectively to form a second electricity price benefit; the first electricity price benefit and the second electricity price benefit are used to perform an optimal solution to obtain the optimal installation plan of the energy storage elements in the energy storage system.

[0032] Specifically, obtain the peak-valley electricity price, normal electricity price, and peak electricity price of the local power grid. Record the number of days the electricity price is valid for each period, including the number of effective days for peak-valley, the number of effective days for peak-valley period, and the number of effective days for peak-flat period, and the number of effective days for peak-flat period. Analyze historical electricity consumption data to understand the distribution of electricity consumption in each period. Assess the changing trend of future electricity demand, especially the potential for electricity growth during peak periods. Determine the parameters of the energy storage system, including energy storage capacity, charging and discharging efficiency, and the number of charging and discharging times. Establish an electricity price benefit model, calculate the electricity expenditure for each period based on the electricity price and electricity consumption in each period, and after introducing the energy storage system, calculate the electricity cost benefit of the energy storage system based on the charging and discharging strategy of the energy storage system and the electricity price difference. Establish an energy storage system cost model. The energy storage system cost model needs to take into account the investment cost and operation and maintenance cost of the energy storage system, and evaluate the service life and depreciation of the energy storage system. The net income of the energy storage system (electricity income minus cost) is used as the objective function; constraints are set, including that the charging and discharging strategy of the energy storage system should meet the dispatching requirements of the power grid, the capacity and charging and discharging times of the energy storage system should be within its technical specifications, and the supply and demand balance and stability requirements of the power grid should be considered. For example, genetic algorithms and particle swarm algorithms are used to optimize and solve the parameters of the energy storage system. Through iterative calculations, the energy storage system parameter combination that maximizes the objective function is found, which is the optimal installation solution.

[0033] The method in this embodiment calculates the electricity price benefit of the energy storage system by obtaining the peak-valley effective days, the peak-valley effective days, the peak-flat effective days and the peak-flat effective days of the energy storage system, and performs an optimal solution based on the electricity price benefit to obtain the optimal installation plan of the energy storage elements in the energy storage system, thereby fully considering the differences between the peak-valley effective days and the peak-flat effective days. Therefore, the optimal installation plan obtained improves the energy storage system when facing different electricity price signals and load structures. It still has the optimal equipment capacity, power configuration and other parameters, thereby ensuring the planning, optimization and operation efficiency of the energy storage system.

[0034] In a specific embodiment, the peak-valley effective days and peak-valley effective days of the energy storage system are obtained according to the maximum charge and discharge power, discharge efficiency, annual unabsorbed electricity of the energy storage system and the total unabsorbed electricity of the energy storage system, including: bt and the undercharge amount of the energy storage system during normal periods Obtain the charge capacity of the energy storage system during normal periods According to the discharge duration n1, n2 of the energy storage system in different peak periods, the power consumption per hour of the energy storage system in the peak period and the discharge efficiency EFF d Obtaining the remaining power of the energy storage system The remaining power is the remaining power after the peak period consumes the charged power during the valley period; The annual unconsumed electricity E peakncon The total unconsumed electricity E tippeakncon , the charging capacity of the energy storage system in normal times Get the effective number of days D of the peak and valley pv and the effective number of days D for the peak and valley sections tippv .

[0035] Specifically, the charging amount during the normal period of the i-th day is: Where P bt is the maximum charging and discharging power of the energy storage system, T is the period when the energy storage system is in the maximum charging and discharging state, is the amount of undercharge during the normal period of the i-th day.

[0036] The remaining power after the second peak period of the i-th day consumes the charged power during the valley period is:

[0037]

[0038] Where n1 is the duration of the first peak period, n2 is the duration of the second peak period, EFF is the amount of electricity consumed by the energy storage during the jth hour of the peak period on the i-th day, d is the discharge efficiency of energy storage.

[0039] In a specific embodiment, the peak-valley effective days and the peak-valley effective days are obtained according to the remaining power, the annual unconsumed power, the total unconsumed power, and the charging amount of the energy storage system in the normal period, including: and the remaining power Obtain the daily unconsumed electricity of the energy storage system According to the unconsumed electricity and the number of days per year to obtain the first equivalent uncharged days of the energy storage system during the peak and valley periods of the year According to the unconsumed electricity The second equivalent number of days that the energy storage system is not fully charged during the peak and valley periods during the peak electricity price period is obtained by combining the number of days during which the energy storage system implements the peak electricity price in a year. According to the annual unconsumed electricity E peakncon , the maximum charge and discharge power P bt , the time period T during which the energy storage system is in the maximum charge and discharge state and the discharge efficiency EFF d Obtain the first equivalent under-discharge days D of the energy storage system peakncon ; The first equivalent undischarged days is the number of days in a year when the energy storage system is not fully discharged; according to the total undischarged electricity Etippeakncon , the maximum charge and discharge power P bt , the time period T during which the energy storage system is in the maximum charge and discharge state and the discharge efficiency EFF d Obtain the second equivalent under-discharge days D of the energy storage system tippeakncon ; The second equivalent uncharged days is the number of days in a year when the energy storage system is uncharged during the peak electricity price period; according to the first equivalent uncharged days The second equivalent unfilled days The first equivalent unused days D peakncon and the second equivalent unfilled days D tippeakncon Get the effective number of days D of the peak and valley pv and the effective number of days D for the peak and valley sections tippv .

[0040] Specifically, the unconsumed electricity on day i is:

[0041]

[0042] The annual undercharged energy storage capacity (the amount of electricity not consumed in the year) and the undercharged energy storage capacity during the peak electricity price period are:

[0043]

[0044] Where m is the number of days in a year, and p is the number of days in a year when peak electricity prices are implemented.

[0045] Equivalent number of days of energy storage not fully charged per year Number of days not fully charged during peak electricity price period for:

[0046]

[0047] Where m is the number of days in a year, and p is the number of days in a year when peak electricity prices are implemented.

[0048] Since the valley electricity price is the lowest and can basically guarantee full charge, this part of electricity is consumed during all peak hours of the day, so the peak-valley equivalent days are analyzed according to the total consumed electricity during the peak period of the day. The following is the calculation method of the total unconsumed electricity during the peak period of the whole year and the corresponding equivalent unfulfilled days.

[0049] The number of days in a year when the energy storage is not fully discharged is expressed as:

[0050]

[0051] Among them, E peakncon P is the annual unconsumed electricity discharged during peak hours by energy storage, bt is the maximum charge and discharge power of the energy storage system, T is the period when the energy storage system is in the maximum charge and discharge state, EFFd is the discharge efficiency.

[0052] The number of days in a year when the energy storage is not fully discharged during the peak electricity price period is expressed as:

[0053]

[0054] Among them, E tippeakncon P is the total unabsorbed electricity discharged by the energy storage during the peak electricity price period. bt Indicates the maximum discharge power of energy storage, T is the period when the energy storage system is in the maximum charge and discharge state, EFF d Indicates the discharge efficiency of energy storage.

[0055] Among them, the annual unconsumed electricity discharged during peak hours is:

[0056]

[0057] Where m is the number of days in a year, It is the unconsumed electricity discharged during the peak period of the i-th day.

[0058] Among them, the total unconsumed electricity discharged during the peak period on days when energy storage implements peak electricity prices is:

[0059]

[0060] Where p is the number of days in a year when peak electricity prices are implemented. is the unconsumed electricity discharged during the peak period of the i-th day.

[0061] Energy storage discharges unabsorbed electricity during peak hours of the day It is expressed as:

[0062]

[0063] Among them, P bt is the maximum charge and discharge power of the energy storage system, T is the period when the energy storage system is in the maximum charge and discharge state, EFF d represents the discharge efficiency of energy storage, It represents the amount of electricity consumed during the peak period of the i-th day.

[0064] The amount of electricity that can be discharged during the peak hours of the day for:

[0065]

[0066] Where n is the duration of the peak period in a day, It is the energy storage discharge consumption in the jth hour during the peak period of the i-th day.

[0067] Energy storage can absorb electricity during peak hours It is expressed as:

[0068]

[0069] Among them, P d is the maximum discharge power of energy storage, EFF d is the discharge efficiency of energy storage, E i,j It represents the net electric load at the jth hour during the peak period on the i-th day (electric load + charging pile power + cold storage power - photovoltaic power generation - wind power generation).

[0070] In a specific embodiment, the obtaining of the peak-valley effective days and the peak-valley effective days according to the first equivalent unfilled days, the second equivalent unfilled days, the first equivalent unfilled days and the second equivalent unfilled days comprises: removing the first equivalent unfilled days from the days of the whole year The first equivalent unused days D peakncon and the number of downtime days D of the energy storage system stop Then obtain the effective number of days D of the peak and valley pv ; The number of days D during which the energy storage system implements peak electricity prices in a year tip Subtract the second equivalent unfilled days The second equivalent unused days D tippeakncon and the number of days of downtime D stop Then obtain the effective number of days D of the peak and valley of the peak segment tippv .

[0071] Specifically, the peak and valley effective days are expressed as:

[0072]

[0073] The effective days of peak and valley sections are expressed as:

[0074]

[0075] Among them, D tip The number of days in a year when peak electricity prices are implemented.

[0076] The amount of charge during flat charging is affected by two factors:

[0077] (1) The first one is affected by the consumption of the previous peak period. If the peak period does not fully consume the energy storage power, it will lead to undercharging of the energy storage during normal periods, where the undercharged amount is the power that was not consumed during the peak period;

[0078] (2) The second one is affected by the user's net power load during normal hours and the user's transformer capacity or maximum demand, where the undercharged power is (charging power per hour - (user transformer capacity * load rate upper limit or maximum demand - power load)) * number of hours during normal hours).

[0079] If the impact of these two factors is on the same day, the relatively large value of undercharge caused by the two factors is the undercharge of the energy storage on a certain day in the flat period.

[0080] In a specific embodiment, the maximum charge and discharge power P of the energy storage element in the energy storage system bt , discharge efficiency EFF d 、The discharge capacity of the energy storage system and the daily undercharge amount of the energy storage system Obtain the peak-average effective days D of the energy storage system pf The effective days of peak-to-peak section D tippf , including: according to the maximum charge and discharge power P bt 、The discharge efficiency EFF d and the discharge capacity Obtaining the unabsorbed power of the energy storage system The unconsumed electricity is the unconsumed electricity during the peak period before the normal period; and the daily undercharge amount of the energy storage system Obtain the peak-average effective days D of the energy storage system pf The effective days of peak-to-peak section D tippf .

[0081] Specifically, the amount of electricity not consumed during the peak period before the normal period is:

[0082]

[0083] Among them, P bt is the maximum charge and discharge power of energy storage, T2 is the charge and discharge hours of energy storage, EFF d is the discharge efficiency of energy storage, It is the amount of electricity discharged and consumed by the energy storage during the peak period before the normal period on the i-th day.

[0084] in, Use the following formula to obtain:

[0085]

[0086] Where n is the number of peak hours before the normal period, It is the energy storage discharge consumption in the jth hour of the peak period before the normal period of the i-th day.

[0087] In a specific embodiment, the method of obtaining the peak-to-average effective days and the peak-to-average effective days of the energy storage system according to the unabsorbed electricity and the daily undercharged amount of the energy storage system includes: and the daily undercharge amount Obtain the undercharged amount E of the energy storage system during the normal period of the year flatnch The amount of charge undercharged during normal times is E tipflatnch The undercharged amount during the normal period is the undercharged amount during the normal period of the peak electricity price period; according to the undercharged amount during the normal period of the year E flatnch and the undercharge amount E during the normal period tipflatnch Get the first equivalent undercharge days D flatnch and the second equivalent undercharge days D tipflatnch ; The first equivalent undercharge days is the equivalent number of days that the energy storage system is undercharged during the normal period of a year; the second equivalent undercharge days is the equivalent number of days that the energy storage system is undercharged during the normal period of the peak electricity price period; obtain the third equivalent undercharge days of the energy storage system during the peak and normal periods of a year and the fourth equivalent number of days that the energy storage system is not fully charged during the peak and flat periods of the peak electricity price period According to the first equivalent undercharge days D flatnch , the second equivalent undercharge days D tipflatnch , the third equivalent unfilled days and the fourth equivalent unfilled number of days Obtain the peak-average effective days D pf The effective days of peak-to-peak section D tippf .

[0088] Specifically, the undercharge amount on the i-th day is affected by the user's power load in normal times and the user's transformer capacity or maximum demand:

[0089]

[0090] Where n is the number of hours in the normal period, It is the amount of electricity that is undercharged in the jth hour of the normal period of the i-th day due to the maximum load or maximum demand of the transformer. It is expressed as:

[0091]

[0092] Among them, P bt is the maximum charging and discharging power of energy storage, E i,j is the net power load in the jth hour of the normal period of the i-th day. rx is the maximum value of the transformer's maximum load and maximum demand. Then the undercharge amount during the normal period of the i-th day is:

[0093]

[0094] The amount of energy storage undercharged during the normal period of the year and the amount of energy storage undercharged during the normal period of the peak electricity price period are respectively:

[0095]

[0096] Where m is the number of days in a year, and n is the number of days when peak electricity prices are implemented.

[0097] The equivalent number of days of undercharging during the normal period of the energy storage year and the equivalent number of days of undercharging during the normal period of the peak electricity price period are:

[0098]

[0099] The discharge time in the second peak period is relatively sufficient, and the battery can be fully discharged on most days. However, there are also some days when the battery is not fully discharged due to low power consumption.

[0100] The annual undercharged energy storage capacity (annual unconsumed electricity) during peak and normal periods, and the undercharged energy storage capacity during peak electricity price periods during peak and normal periods are:

[0101]

[0102] Among them, m is the number of days in a year, and p is the number of days in a year when the peak electricity price is implemented during the peak and off-peak periods.

[0103] The equivalent number of days that the energy storage is not fully charged in a year and the number of days that the energy storage is not fully charged during the peak electricity price period is:

[0104]

[0105] Where m is the number of days in a year, and p is the number of days in a year when peak electricity prices are implemented.

[0106] In a specific embodiment, the peak-to-average effective days are expressed as:

[0107]

[0108] The effective days of peak-to-peak period are expressed as:

[0109]

[0110] Among them, D tip The number of days in a year when peak electricity prices are implemented.

[0111] In a specific embodiment, the peak-valley effective days and the peak-valley effective days D tippv Obtaining the first electricity price income of the energy storage system using the peak-valley electricity price for power supply, including: bt, the time period T during which the energy storage system is in the maximum charge and discharge state, the discharge efficiency EFF d , Peak-time electricity price C peak , Off-peak electricity price C valley , the peak and valley effective days D pv and the effective number of days D for the peak and valley sections tippv And charging efficiency EFF ch Obtain the peak-valley electricity price income I of the energy storage system pv According to the first ratio, the maximum charge and discharge power P bt , the time period T during which the energy storage system is in the maximum charge and discharge state, the discharge efficiency EFF d , Peak-time electricity price C peak , the second ratio, peak period electricity price C tippeak , Off-peak electricity price C valley And charging efficiency EFF ch Obtain the peak electricity price income I of the energy storage system during peak and valley periods tippv The first ratio is the ratio of the peak period in a day to the peak period and the peak period, and the second ratio is the ratio of the peak period in a day to the peak period and the peak period; the peak and valley period electricity price income I pv The peak electricity price benefits I tippv The first electricity price benefit is obtained by summing the values.

[0112] Specifically, the profit of energy storage using the peak-valley price difference is calculated as follows:

[0113] (1) Peak and valley electricity price benefits

[0114]

[0115] (2) Benefits of implementing peak electricity prices during peak and valley periods

[0116]

[0117] Among them, R peak is the ratio of peak hours to peak hours and peak hours in a day, R tippeak is the ratio of the peak period to the peak period and the peak period in a day, C peak is the peak electricity price, C valley is the off-peak electricity price, C tippeak The peak electricity price.

[0118] (3) Peak and flat electricity price benefits

[0119]

[0120] Among them, C peak is the peak electricity price, C flatThis is the normal electricity price.

[0121] (4) Benefits of implementing peak electricity prices during peak and flat periods

[0122]

[0123] Investment calculation of energy storage system all Use the following formula to obtain:

[0124] C all =C nbinit +C binit +C te +C de

[0125] Among them, C nbinit is the initial investment (not including the battery), C binit is the initial investment (battery part), C te For technical transformation investment, C de For depreciation.

[0126] Total annual income I year for:

[0127] I year =I pv +I tippv +I pf +I tippf

[0128] Among them, I pv is the peak-valley electricity price income, I tippv To implement peak electricity price benefits for peak and valley pf is the peak-average electricity price income, I tippf To implement peak electricity pricing to level out the benefits.

[0129] Operating costs As shown below:

[0130]

[0131] Among them, r tax is the tax rate, is the depreciation expense in year i, is the operation and maintenance cost in the i-th year, is the insurance cost in year i, is the material cost in year i, is the other expenses in year i.

[0132] Net Profit I all for:

[0133]

[0134] Among them, rco is the peak-to-valley arbitrage profit sharing ratio of the partners, r tax is the value added tax rate, r dtax is the income tax rate, r d is the battery decay rate.

[0135] Capital outflow during construction period C buid for:

[0136]

[0137] Among them, C ex Project development fee, N build The number of months for construction.

[0138] Annual net cash flow L i for:

[0139]

[0140] Among them, C fbuid is the first year construction cost. When i=1, C fbuid =C nbinit +C binit -C buid , otherwise C fbuid is 0. is the technical transformation cost in the i-th year, For VAT, For income tax.

[0141] Internal rate of return profit For: r profit =LRR(C build ,L1,…,L Y ).

[0142] In the specific embodiments, see Figure 2, is a structural schematic diagram of an energy storage element installation scheme optimization system provided in the second embodiment of the present application, the system comprising: a first effective day acquisition module 201, a second effective day acquisition module 202, a first electricity price benefit acquisition module 203, a second electricity price benefit acquisition module 204 and an installation scheme output module 205; the first effective day acquisition module 201 is used to obtain the peak-valley effective days and peak-valley effective days of the energy storage system according to the maximum charge and discharge power, discharge efficiency, annual unabsorbed electricity of the energy storage system and the total unabsorbed electricity of the energy storage system of the energy storage system; wherein the annual unabsorbed electricity is the annual unabsorbed electricity discharged in the peak-valley period; the total unabsorbed electricity is the total unabsorbed electricity discharged in the peak-valley period during the peak electricity price period; the second effective day acquisition module 202 is used to obtain the peak-valley effective days and peak-valley effective days of the energy storage system according to the maximum charge and discharge power, discharge efficiency, discharge absorption electricity of the energy storage system and the daily undercharge of the energy storage system of the energy storage element in the energy storage system. The peak-to-average effective days and the peak-to-average effective days of the energy storage system are obtained; wherein, the discharge and absorption power is the absorption power discharged by the energy storage system in the peak period before the normal period; the undercharged power is the undercharged power of the energy storage system affected by the user's power load in the normal period and the capacity or maximum demand of the user's transformer; the first electricity price benefit acquisition module 203 is used to obtain the first electricity price benefit of the energy storage system using the peak-to-valley electricity price for power supply according to the peak-to-valley effective days and the peak-to-valley effective days of the peak period; the second electricity price benefit acquisition module 204 is used to obtain the second electricity price benefit of the energy storage system using the peak-to-average electricity price for power supply according to the peak-to-average effective days and the peak-to-average effective days of the peak period; the installation plan output module 205 is used to use the first electricity price benefit and the second electricity price benefit for optimal solution to obtain the optimal installation plan of the energy storage element in the energy storage system; the optimal installation plan includes the capacity, quantity and target maximum charge and discharge power of the energy storage element.

[0143] The system in this embodiment calculates the electricity price benefit of the energy storage system by obtaining the peak-valley effective days, the peak-valley effective days, the peak-flat effective days and the peak-flat effective days of the energy storage system, and performs an optimal solution based on the electricity price benefit to obtain the optimal installation plan of the energy storage elements in the energy storage system, thereby fully considering the differences between the peak-valley effective days and the peak-flat effective days. Therefore, the optimal installation plan obtained improves the energy storage system when facing different electricity price signals and load structures. It still has the optimal equipment capacity, power configuration and other parameters, thereby ensuring the planning, optimization and operation efficiency of the energy storage system.

[0144] In a specific embodiment, the third embodiment of the present application provides an installation scheme optimization device for energy storage elements, including a memory and a processor, the memory storing a computer program, and when the computer program is executed by the processor, the processor executes the steps of the method described in any one of the first embodiments of the present application.

[0145] In a specific embodiment, the fourth embodiment of the present application provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the processor executes the steps of the method as described in any one of the first embodiments of the present application.

[0146] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

[0147] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A method for optimizing the installation scheme of an energy storage element, characterized in that: The method comprises: According to the maximum charge and discharge power, discharge efficiency, annual unabsorbed electricity of the energy storage system and total unabsorbed electricity of the energy storage system, the peak-valley effective days and peak-valley effective days of the energy storage system are obtained; wherein the annual unabsorbed electricity is the annual unabsorbed electricity discharged during the peak-valley period; the total unabsorbed electricity is the total unabsorbed electricity discharged during the peak-valley period during the period of peak electricity price implementation; According to the maximum charge and discharge power, discharge efficiency, discharge and absorption capacity of the energy storage elements in the energy storage system, and the daily undercharge capacity of the energy storage system, the peak-to-average effective days and peak-to-average effective days of the energy storage system are obtained; wherein the discharge and absorption capacity is the absorption capacity of the energy storage system discharged during the peak period before the normal period; the undercharge capacity is the undercharge capacity of the energy storage system affected by the user's power load during the normal period and the capacity or maximum demand of the user's transformer; Obtaining a first electricity price benefit of the energy storage system using the peak-valley electricity price for power supply according to the peak-valley effective days and the peak-valley effective days; Obtaining a second electricity price benefit of the energy storage system using the peak-to-flat electricity price for power supply according to the peak-to-flat effective days and the peak-to-flat effective days; The first electricity price benefit and the second electricity price benefit are used to perform an optimal solution to obtain an optimal installation plan for energy storage elements in the energy storage system; the optimal installation plan includes the capacity, quantity and target maximum charge and discharge power of the energy storage elements.

2. The method for optimizing the installation scheme of the energy storage element according to claim 1, characterized in that: The method of obtaining the peak-valley effective days and the peak-valley effective days of the energy storage system according to the maximum charge and discharge power, discharge efficiency, annual unabsorbed electricity of the energy storage system and the total unabsorbed electricity of the energy storage system of the energy storage element in the energy storage system includes: Obtaining the charge amount of the energy storage system in normal times according to the maximum charge and discharge power and the undercharge amount of the energy storage system in normal times; The remaining power of the energy storage system is obtained according to the discharge duration of the energy storage system in different peak time periods, the power consumed by the energy storage system per hour in the peak time period and the discharge efficiency; the remaining power is the remaining power after the peak time period consumes the charging power in the valley time period; The peak-valley effective days and the peak-valley effective days are obtained according to the remaining electricity, the annual unconsumed electricity, the total unconsumed electricity, and the charging amount of the energy storage system in normal periods.

3. The method for optimizing the installation scheme of the energy storage element according to claim 2, characterized in that: The obtaining of the peak-valley effective days and the peak-valley effective days according to the remaining electricity, the annual unconsumed electricity, the total unconsumed electricity, and the charging amount of the energy storage system in normal periods includes: Obtaining the unconsumed electricity of the energy storage system every day according to the charge amount of the energy storage system in normal time and the remaining electricity; Obtaining a first equivalent number of unfulfilled days of the energy storage system during peak and valley periods of the year according to the unconsumed electricity and the number of days per year; According to the unabsorbed electricity and the number of days in a year when the energy storage system implements the peak electricity price, obtain the second equivalent number of days when the energy storage system is not fully charged during the peak and valley periods of the peak electricity price period; Obtain a first equivalent number of days of the energy storage system that is not fully discharged according to the annual unconsumed electricity, the maximum charge and discharge power, the time period when the energy storage system is in the maximum charge and discharge state, and the discharge efficiency; the first equivalent number of days of the energy storage system that is not fully discharged is the number of days in which the energy storage system is not fully discharged in a year; Obtaining a second equivalent number of days of the energy storage system that is not fully discharged according to the total unabsorbed electricity, the maximum charge and discharge power, the time period when the energy storage system is in the maximum charge and discharge state, and the discharge efficiency; the second equivalent number of days of the energy storage system that is not fully discharged is the number of days when the energy storage system is not fully discharged during the peak electricity price period in a year; The peak-valley effective days and the peak-segment peak-valley effective days are obtained according to the first equivalent unfilled days, the second equivalent unfilled days, the first equivalent unfilled days and the second equivalent unfilled days.

4. The method for optimizing the installation scheme of the energy storage element according to claim 3, characterized in that: The obtaining the peak-valley effective days and the peak-segment peak-valley effective days according to the first equivalent unfilled days, the second equivalent unfilled days, the first equivalent unfilled days, and the second equivalent unfilled days includes: The peak-valley effective days are obtained by removing the first equivalent under-charge days, the first equivalent under-charge days and the downtime days of the energy storage system from the number of days in a year; The peak-valley effective days of the peak period are obtained by subtracting the second equivalent undercharge days, the second equivalent undercharge days and the shutdown days from the number of days in a year when the energy storage system implements the peak electricity price.

5. The method for optimizing the installation scheme of the energy storage element according to claim 1, characterized in that: The method of obtaining the peak-to-average effective days and the peak-to-average effective days of the energy storage system according to the maximum charge and discharge power of the energy storage element in the energy storage system, the discharge efficiency, the discharge and absorption capacity of the energy storage system and the daily undercharge amount of the energy storage system comprises: Obtaining the unabsorbed electricity of the energy storage system according to the maximum charge and discharge power, the discharge efficiency and the discharge absorbed electricity; the unabsorbed electricity is the unabsorbed electricity during the peak period before the normal period; The peak-to-average effective days and the peak-to-average effective days of the energy storage system are obtained according to the unconsumed electricity and the daily undercharged amount of the energy storage system.

6. The method for optimizing the installation scheme of the energy storage element according to claim 5, characterized in that: The step of obtaining the peak-to-average effective days and the peak-to-average effective days of the energy storage system according to the unabsorbed electricity and the daily undercharged amount of the energy storage system includes: According to the unconsumed electricity and the daily undercharged electricity, the undercharged electricity amount of the energy storage system in the annual normal period and the undercharged electricity amount in the normal period are obtained; the undercharged electricity amount in the normal period is the undercharged electricity amount in the normal period during the peak electricity price period; According to the undercharge amount during the normal period of the year and the undercharge amount during the normal period, a first equivalent undercharge amount days and a second equivalent undercharge amount days are obtained; the first equivalent undercharge amount days are the equivalent undercharge amount days of the energy storage system during the normal period of a year; the second equivalent undercharge amount days are the equivalent undercharge amount days of the energy storage system during the peak electricity price period; Obtain the third equivalent number of days that the energy storage system is not fully charged during the peak and normal periods of the year and the fourth equivalent number of days that the energy storage system is not fully charged during the peak and normal periods during the peak electricity price period; The peak-to-average effective days and the peak-to-average effective days in the peak period are obtained according to the first equivalent undercharge days, the second equivalent undercharge days, the third equivalent undercharge days and the fourth equivalent undercharge days.

7. The method for optimizing the installation scheme of the energy storage element according to claim 1, characterized in that: The obtaining, according to the effective number of peak-valley days and the effective number of peak-valley days in the peak period, a first electricity price benefit of the energy storage system using the peak-valley electricity price for power supply includes: Obtain the peak-valley electricity price income of the energy storage system according to the maximum charge and discharge power, the period T during which the energy storage system is in the maximum charge and discharge state, the discharge efficiency, the peak-time electricity price, the valley-time electricity price, the peak-valley effective days, the peak-valley effective days and the charging efficiency; The peak-valley peak electricity price benefit of the energy storage system is obtained according to the first ratio, the maximum charge and discharge power, the time period when the energy storage system is in the maximum charge and discharge state, the discharge efficiency, the peak period electricity price, the second ratio, the peak period electricity price, the valley period electricity price and the charging efficiency; the first ratio is the ratio of the peak period to the peak period and the peak period in a day, and the second ratio is the ratio of the peak period to the peak period and the peak period in a day; The first electricity price benefit is obtained by summing the peak-valley period electricity price benefit and the peak-valley implementation peak electricity price benefit.

8. A system for optimizing the installation scheme of energy storage elements, characterized in that: The system comprises: a first effective days acquisition module, a second effective days acquisition module, a first electricity price benefit acquisition module, a second electricity price benefit acquisition module and an installation plan output module; The first effective days acquisition module is used to obtain the peak-valley effective days and peak-valley effective days of the energy storage system according to the maximum charge and discharge power discharge efficiency of the energy storage element in the energy storage system, the annual unabsorbed electricity of the energy storage system and the total unabsorbed electricity of the energy storage system; wherein the annual unabsorbed electricity is the annual unabsorbed electricity discharged during the peak-valley period; the total unabsorbed electricity is the total unabsorbed electricity discharged during the peak-valley period during the peak electricity price period; The second effective days acquisition module is used to obtain the peak-to-average effective days and peak-to-average effective days of the energy storage system according to the maximum charge and discharge power, discharge efficiency, discharge and absorption power of the energy storage elements in the energy storage system, and the daily undercharged power of the energy storage system; wherein the discharge and absorption power is the absorption power discharged by the energy storage system in the peak period before the normal period; the undercharged power is the undercharged power of the energy storage system affected by the user's power load in the normal period and the capacity or maximum demand of the user's transformer; The first electricity price benefit acquisition module is used to acquire the first electricity price benefit of the energy storage system using the peak-valley electricity price for power supply according to the peak-valley effective days and the peak-valley effective days; The second electricity price benefit acquisition module is used to acquire the second electricity price benefit of the energy storage system using the peak-to-flat electricity price for power supply according to the peak-to-flat effective days and the peak-to-flat effective days; The installation plan output module is used to use the first electricity price benefit and the second electricity price benefit to perform an optimal solution to obtain an optimal installation plan for the energy storage elements in the energy storage system; the optimal installation plan includes the capacity, quantity and target maximum charge and discharge power of the energy storage elements.

9. A device for optimizing the installation scheme of an energy storage element, comprising a memory and a processor, characterized in that: The memory stores a computer program, and when the computer program is executed by the processor, the processor is caused to perform the steps of the method according to any one of claims 1 to 7.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the processor is caused to perform the steps of the method according to any one of claims 1 to 7.

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