Capacity and power configuration method of energy storage power station

Abstract

The invention provides a capacity and power configuration method for an energy storage power station, and the method can still meet the contract capacity of the energy storage power station under the condition of electric quantity attenuation in the use process of a battery through a configuration scheme of an energy complementing unit. The control strategy of performing power distribution according to the battery capacity can balance the capacity distribution between the initially installed battery of the energy storage power station and the energy supplementing battery, control the circulation between the new and old batteries caused by adding the energy supplementing battery, maintain the normal operation of the energy storage power station, and meet the contract power requirement of the whole power station. Therefore, the requirements of contract capacity and contract power of the energy storage power station in the service cycle are met.

Description

Technical Field

[0001] The invention relates to a capacity and power configuration method of an energy storage power station, belonging to the technical field of chemical energy storage power stations. Background Art

[0002] With the increasing number of renewable energy installations, energy storage power stations are receiving great attention from countries around the world. With the improvement of lithium-ion battery performance and the reduction of costs, lithium-ion batteries, especially lithium iron phosphate batteries, have become the most commonly used batteries. The cycle life of lithium-ion batteries is closely related to the number of cycles and discharge depth. The discharge depth of lithium-ion batteries usually used in energy storage power stations is fixed at 80%~90%. As the number of cycles increases, the capacity of the battery will gradually decay. Figure 8 It is a schematic diagram of the capacity decay rate of the battery as the number of cycles increases. It can be seen that when the number of cycles reaches 5000, the battery capacity is only 74% of the initial capacity. It is generally believed that when the battery capacity decays to below 80%, the battery is no longer suitable for continued use.

[0003] In order to ensure that the battery capacity of the energy storage power station can meet the contract capacity during the service life, the usual practice is to fully consider the attenuation capacity of the battery during the service life at the beginning of the construction of the energy storage power station, and over-configure the initial installed battery capacity, so that the initial installed capacity is much larger than the contract capacity of the power station. For example, if the contract capacity of the energy storage power station is 10MWh, the warranty period is 10 years, the contract power of the energy storage power station is 5MW, and the initial installed battery capacity is configured to be 12.5MWh, after 10 years, the battery capacity will decay to 80%, in order to ensure that the contract capacity is still 10MWh during the warranty period. This will lead to the problem of waste of initial investment in energy storage power stations and low return on investment. Summary of the invention

[0004] The present invention provides a capacity and power configuration method of an energy storage power station, as well as a device, an electronic device and a computer-readable storage medium.

[0005] To solve the above problems, the specific technical solutions of the present invention are as follows: A capacity and power configuration method of an energy storage power station, the energy storage power station includes a pre-installed battery, a PCS unit and an EMS unit, one end of the PCS unit is connected to the power grid, and the other end is connected to the pre-installed battery and the EMS unit respectively, and the EMS unit is also connected to the pre-installed battery; the capacity and power configuration method of the energy storage power station includes the following steps: Obtain the battery parameters of all batteries in the energy storage power station and determine the current total capacity of all batteries; According to the determined current total capacity of all batteries, judging whether the current total capacity of all batteries meets the constraint condition of the contract capacity; Determine the capacity configuration scheme of the energy storage power station according to the current total capacity of all batteries satisfying the constraint conditions of the contract capacity; and determine the power configuration scheme of the energy storage power station in which the EMS unit sends power dispatch instructions to the PCS unit and to the energy replenishment unit respectively; Update the battery parameters of all batteries in the energy storage power station and regenerate the capacity configuration plan and power configuration plan of the energy storage power station; The constraint condition of the contract capacity is that the current total capacity of all batteries ≥ the contract capacity; all batteries include initial installation batteries and rechargeable batteries; the battery parameters include battery state of charge, battery capacity, battery health status and battery voltage; The capacity configuration scheme of the energy storage power station includes: when the current total capacity of all batteries meets the constraint conditions of the contract capacity, no energy replenishment unit is configured, and when the current total capacity of all batteries does not meet the constraint conditions of the contract capacity, a single energy replenishment unit is configured; the power configuration scheme of the energy storage power station includes sending a PCS power dispatch instruction to the PCS unit, and sending a power dispatch instruction allocated according to the capacity ratio to the battery circulation controller of the energy replenishment unit; The energy replenishment unit is composed of a group of battery circulation controllers connected to a group of energy replenishment batteries. The energy replenishment unit and the initial battery are connected in parallel between the PCS unit and the EMS unit. The battery circulation controller and the energy replenishment battery of the energy replenishment unit are respectively connected to the EMS unit.

[0006] Furthermore, the calculation formula of the current total capacity of all batteries is as follows: When no energy replenishment unit is configured, ; When equipped with a charging unit, ;

[0007] In the formula, C 0 is the initial battery capacity, SOH 0 This is the health status of the battery when it is first installed. SOC 0 This is the initial battery charge status. C x is the capacity of the energy replenishment battery in the xth energy replenishment unit, SOH x is the health status of the energy replenishment battery in the xth energy replenishment unit, SOC x is the state of charge of the energy replenishment battery in the xth energy replenishment unit, 1≤x≤n, and n is the total number of energy replenishment units.

[0008] Furthermore, the energy replenishment unit is composed of a group of DC / DC converters and a group of energy replenishment batteries connected in series; the power scheduling instruction allocated according to capacity ratio refers to a current reference instruction for current / power allocation based on the ratio of the current capacity of the energy replenishment battery to the current total capacity of all batteries.

[0009] Furthermore, for the case where the efficiency of the DC / DC converters of the PCS unit and each energy replenishment unit is 1, when the capacity of the energy storage power station is configured, the power dispatch instruction allocated according to the capacity ratio is the current reference instruction sent to the DC / DC converter of each energy replenishment unit, and the current reference instruction sent to the DC / DC converter of the xth energy replenishment unit is It is expressed as follows: ; In the formula, The power dispatch instruction of the energy storage power station sent by the EMS unit to the PCS unit; C 0 is the initial battery capacity, SOH 0 This is the health status of the battery when it is first installed. SOC 0 This is the initial battery charge status. v 0 Initial battery voltage ; C x is the capacity of the energy replenishment battery in the xth energy replenishment unit, SOH x is the health status of the energy replenishment battery in the xth energy replenishment unit, SOC x is the state of charge of the energy replenishment battery in the xth energy replenishment unit, v x is the voltage of the energy replenishment battery in the xth energy replenishment unit, 1≤x≤n, and n is the total number of energy replenishment units.

[0010] Furthermore, the efficiencies of the DC / DC converters of the PCS unit and each energy replenishment unit are: , , … In the case where the battery parameters also include the above efficiency, when the capacity of the energy storage power station is configured, the power dispatch instruction allocated according to the capacity ratio is a current reference instruction sent to the DC / DC converter of each energy replenishment unit, and a current reference instruction sent to the DC / DC converter of the xth energy replenishment unit. The charging and discharging states are shown as follows: When charging: ; In discharge state: ; In the formula, The power dispatch instruction of the energy storage power station sent by the EMS unit to the PCS unit; C 0 is the initial battery capacity, SOH 0 This is the health status of the battery when it is first installed. SOC 0 This is the initial battery charge status. v 0 Initial battery voltage ; C x is the capacity of the energy replenishment battery in the xth energy replenishment unit, SOH x is the health status of the energy replenishment battery in the xth energy replenishment unit, SOC x is the state of charge of the energy replenishment battery in the xth energy replenishment unit, v x is the voltage of the energy replenishment battery in the xth energy replenishment unit, 1≤x≤n, and n is the total number of energy replenishment units.

[0011] Furthermore, the capacity of the initially installed battery should not be less than 1.05 times the contracted capacity of the energy storage power station; or the capacity of the initially installed battery should at least meet the operating requirements of the energy storage power station during the 1-year warranty period; the capacity of the energy replenishment battery of the energy replenishment unit configured each time is 1 / 10 to 1 / 3 times the capacity of the initially installed battery.

[0012] Furthermore, the initially installed battery is a battery installed for the first time in the energy storage power station, or an excess battery installed in the energy storage power station to meet the warranty period requirements. The initially installed battery is a battery pack or is composed of multiple battery packs.

[0013] A device for realizing capacity and power configuration of an energy storage power station, the energy storage power station comprising an initial battery, a PCS unit and an EMS unit, one end of the PCS unit is connected to the power grid, and the other end is respectively connected to the initial battery and the EMS unit, the EMS unit is also connected to the initial battery, the device for realizing capacity and power configuration of the energy storage power station also comprises the following modules: The current total capacity calculation module obtains the battery parameters of all batteries in the energy storage power station and determines the current total capacity of all batteries; The contract capacity judgment module judges whether the current total capacity of all batteries meets the constraint condition of the contract capacity according to the determined current total capacity of all batteries; The capacity and power configuration module determines the capacity configuration scheme of the energy storage power station according to the current total capacity of all batteries satisfying the constraint conditions of the contract capacity; and determines the power configuration scheme of the energy storage power station in which the EMS unit sends power dispatch instructions to the PCS unit and to the energy replenishment unit respectively; Update the iteration module, update the battery parameters of all batteries in the energy storage power station, and regenerate the capacity configuration plan and power configuration plan of the energy storage power station; The constraint condition of the contract capacity is that the current total capacity of all batteries ≥ the contract capacity; all batteries include initially installed batteries and rechargeable batteries; the battery parameters include battery state of charge, battery capacity, battery health status and battery voltage; The capacity configuration scheme of the energy storage power station includes: when the current total capacity of all batteries meets the constraint conditions of the contract capacity, no energy replenishment unit is configured, and when the current total capacity of all batteries does not meet the constraint conditions of the contract capacity, a single energy replenishment unit is configured; the power configuration scheme of the energy storage power station includes sending a PCS power dispatch instruction to the PCS unit, and sending a power dispatch instruction allocated according to the capacity ratio to the battery circulation controller of the energy replenishment unit; The energy replenishment unit is composed of a group of battery circulation controllers connected to a group of energy replenishment batteries. The energy replenishment unit and the initially installed battery are connected in parallel between the PCS unit and the EMS unit. The battery circulation controller and the energy replenishment battery of the energy replenishment unit are respectively connected to the EMS unit.

[0014] An electronic device comprises a memory and a processor, wherein the memory stores a computer program, and the processor is used to call and run the computer program stored in the memory to execute the above method.

[0015] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the above method are implemented.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The capacity and power configuration method of the energy storage power station of the present invention can still meet the contract capacity of the energy storage power station through the configuration scheme of the energy replenishment unit when the battery power is attenuated during use. The control strategy for power distribution according to the battery capacity can balance the capacity distribution between the initial battery and the energy replenishment battery of the energy storage power station, and control the circulation between the new and old batteries caused by the addition of the energy replenishment battery, so as to maintain the normal operation of the energy storage power station and meet the contract power requirements of the entire power station. In this way, the contract capacity and contract power requirements of the energy storage power station are guaranteed within the use cycle.

[0017] In the system of the present invention, by setting a battery circulation controller, the battery of each energy replenishment unit is independently controlled, avoiding the circulation phenomenon between batteries. If a battery circulation controller is not set, multiple groups of batteries with different usage levels are connected in parallel. Due to the difference in opening voltage and internal resistance, after being forced to be connected in parallel, the current will flow from the battery with high internal resistance (old battery) to the battery with low internal resistance (new battery), generating invalid circulation, increasing battery loss, generating additional heat, and accelerating battery aging.

[0018] The capacity and power configuration method of the energy storage power station of the present invention, on the basis of ensuring that the initial installed battery capacity meets the contract capacity of the power station, gradually adds the required batteries according to the battery attenuation curve, so that the contract capacity requirements of the energy storage power station can be met throughout the service life, and the initial investment of the entire energy storage power station can be maintained at a small level.

[0019] The present invention overcomes the problem that the existing energy storage power station investment and construction adopts a one-time configuration mode for batteries, which leads to a high initial investment cost for the energy storage power station construction. It also overcomes the problem that when batteries are configured multiple times, the circulation problem will occur when new and old batteries are used in parallel, which accelerates the aging of new batteries, and may cause the old batteries to be overcharged / over-discharged, accelerating the damage of the old batteries.

[0020] The capacity and power configuration method of the energy storage power station of the present invention is applicable to a new construction plan of an energy storage power station, and is also applicable to an energy replenishment design plan of an existing energy storage power station.

[0021] The present invention independently controls the current / power of each group of batteries according to the ratio of the current capacity of the energy replenishment battery to the current total capacity of all batteries. The battery circulation controller can directly control the current value of the energy replenishment battery connected in series with it. The battery with large capacity has large charge / discharge current, and the battery with low capacity has small charge / discharge current, thereby balancing the charge / discharge current / power balance between batteries of different capacities, suppressing different attenuation rates between batteries, and avoiding circulation between different batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0023] Figure 1 A circuit topology diagram for realizing the capacity and power configuration method of the energy storage power station of the present invention; Figure 2 A control flow chart of the capacity and power configuration method of the energy storage power station of the present invention; Figure 3 It is one of the recommended topologies of the DC / DC converter in the present invention; Figure 4 The second recommended topology for the DC / DC converter in the present invention; Figure 5 The third recommended topology for the DC / DC converter in the present invention; Figure 6 A circuit topology diagram for realizing a capacity and power configuration method of an energy storage power station of the present invention; Figure 7 It is the relationship curve between the number of battery charge / discharge cycles and the battery capacity attenuation rate in the application example; Figure 8 The relationship curve between the number of battery charge / discharge cycles and battery capacity for the application example; Fig. 9 The relationship curve between the battery operating years and the battery capacity attenuation rate of the application example; Fig.10 The curve showing the relationship between battery operating years and battery capacity for an application example. DETAILED DESCRIPTION

[0024] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. In the parameters of the present invention, SOC: used to reflect the remaining capacity of the battery, refers to the ratio of the current remaining charge of the battery to the rated charge; SOH: characterizes the ability of the current battery to store electrical energy relative to a new battery, refers to the ratio of the current battery's full charge energy to the fresh battery's full charge energy; C: represents the battery capacity. Embodiment 1:

[0025] The capacity and power configuration method of the energy storage power station of the present invention is as follows: Figure 1 As shown in the figure, the energy storage power station includes: initial battery, supplementary battery, battery circulation controller, PCS unit, and EMS unit. The PCS unit is the abbreviation of power conversion system (Power Convert System), and the EMS unit is the abbreviation of energy management system (Energy Management System).

[0026] The energy replenishment unit is composed of a group of battery circulation controllers connected to a group of energy replenishment batteries. In this example, the battery circulation controller adopts a DC / DC converter. The energy replenishment unit is connected in parallel with the initial battery between the PCS unit and the EMS unit. The DC / DC converter and the energy replenishment battery of the energy replenishment unit are connected to the EMS unit. The energy replenishment unit is connected in parallel with the initial battery between the PCS unit and the EMS unit. One end of the PCS unit is connected to the power grid, and the other end is connected to the initial battery, the battery circulation controller and the EMS unit respectively. The EMS unit is connected to the initial battery, the energy replenishment battery and the battery circulation controller respectively.

[0027] like Figure 2 As shown, the capacity and power configuration steps of the energy storage power station of the present invention are as follows: Step 1, obtaining battery parameters of all batteries in the energy storage power station and determining the current total capacity of all batteries; The current total capacity of all batteries is calculated as follows: When no energy replenishment unit is configured, ;

[0028] When equipped with a charging unit, ; It can be seen from the above formula that if the energy storage power station currently does not include a supplementary battery, the current total capacity of all batteries is only the current total capacity of the initially installed batteries.

[0029] Step 2: judging whether the current total capacity of all batteries meets the constraint condition of the contract capacity according to the determined current total capacity of all batteries; Step 3, according to the current total capacity of all batteries satisfying the constraint conditions of the contract capacity, determine the capacity configuration scheme of the energy storage power station; and determine the power configuration scheme of the energy storage power station in which the EMS unit sends power dispatch instructions to the PCS unit and to the energy replenishment unit respectively; Step 4: Update the battery parameters of all batteries in the energy storage power station, and regenerate the capacity configuration plan and power configuration plan of the energy storage power station.

[0030] Among them, the constraint condition of the contract capacity is that the current total capacity of all batteries ≥ the contract capacity, which is equivalent to the current total capacity of all batteries ≥ the contract capacity; All batteries include initially installed batteries and rechargeable batteries; the battery parameters include battery state of charge, battery capacity, battery health status and battery voltage; In step 3, the capacity configuration scheme of the energy storage power station includes: when the current total capacity of all batteries meets the constraint conditions of the contract capacity, no energy replenishment unit is configured, and when the current total capacity of all batteries does not meet the constraint conditions of the contract capacity, a single energy replenishment unit is configured; the power configuration scheme of the energy storage power station includes sending a PCS power dispatch instruction to the PCS unit, and sending a power dispatch instruction allocated according to the capacity ratio to the battery circulation controller of the energy replenishment unit; Battery parameters of the initial battery: initial battery capacity, initial battery health status, initial battery state of charge and initial battery voltage; Battery parameters of the rechargeable battery: rechargeable battery capacity, rechargeable battery health status, rechargeable battery state of charge and rechargeable battery voltage.

[0031] Initially installed batteries are batteries installed for the first time in an energy storage power station, or batteries that have been installed in an energy storage power station to meet warranty requirements. Excess initially installed batteries are one battery pack or multiple battery packs.

[0032] In step 3, the PCS power dispatch instruction is determined according to the dispatch information of the energy storage power station, and the value of the PCS power dispatch instruction sent to the PCS unit should not be greater than the contracted power of the energy storage power station. The above-mentioned power dispatch instruction allocated by capacity ratio allocates current / power according to the ratio of the current capacity of the energy replenishment battery to the current total capacity of all batteries. The larger the proportion, the more current / power is allocated.

[0033] During the control process of the PCS unit for the initial installation of the battery, when there is no energy replenishment unit, the AC side power of the PCS unit is controlled. , can directly control the power of the initial battery , thereby controlling the charge / discharge current and power of the initial battery, and When the energy replenishment unit is added, the AC side power of the PCS unit is independently controlled. And the current / power of each charging unit can indirectly control the power of the initial battery .in . v x To replenish the battery voltage, i x is the battery current, x represents the xth battery unit, 1≤x≤n, and n is the total number of battery units. ; is the output power of the initial battery installation, and .

[0034] In the formula, The power dispatch instruction of the energy storage power station sent by the EMS unit to the PCS unit; C 0 is the initial battery capacity, SOH 0 This is the health status of the battery when it is first installed. SOC 0 This is the initial battery charge status. v 0 Initial battery voltage ; C x is the capacity of the energy replenishment battery in the xth energy replenishment unit, SOH x is the health status of the energy replenishment battery in the xth energy replenishment unit, SOC x is the state of charge of the energy replenishment battery in the xth energy replenishment unit, v x is the voltage of the energy replenishment battery in the xth energy replenishment unit, 1≤x≤n, and n is the total number of energy replenishment units. Embodiment 2:

[0035] The topology of the DC / DC converter of the energy replenishment unit in the present invention is as follows: Figure 3-5 As shown, you can select one of three types. Figure 3 The one shown in the figure is a Boost type bidirectional DC / DC; Figure 4 The one shown in the figure is a Buck step-down bidirectional DC / DC; Figure 5 The figure shows a Buck-Boost buck-boost bidirectional DC / DC; the switch tube S in each figure is x (x=1, 2, 3, 4) can be MOSFET or IGBT.

[0036] Initially installed batteries are batteries installed for the first time in an energy storage power station, or batteries that have been installed in excess of the warranty period requirements in an energy storage power station. Initially installed batteries can be one battery pack or multiple battery packs.

[0037] When configuring the capacity of the energy storage power station, a power dispatch instruction is sent to the PCS unit based on the dispatch information of the energy storage power station, and its value should not be greater than the contracted power of the energy storage power station. Embodiment three:

[0038] This example is further designed on the basis of the first embodiment. The capacity and power configuration method of the energy storage power station of the present invention, for the case where the efficiency of the DC / DC converters of the PCS unit and each energy replenishment unit is 1, when the capacity of the energy storage power station is configured, the power dispatching instruction allocated according to the capacity ratio sent by the EMS unit to the battery circulation controller of the energy replenishment unit is the current reference instruction sent to the DC / DC converter of each energy replenishment unit. For the current reference instruction sent to the DC / DC converter of the xth energy replenishment unit It is expressed as follows: ;

[0039] In the formula, The power dispatch instruction of the energy storage power station sent by the EMS unit to the PCS unit; C 0 is the initial battery capacity, SOH 0 This is the health status of the battery when it is first installed. SOC 0 This is the initial battery charge status. v 0 Initial battery voltage ; C x is the capacity of the energy replenishment battery in the xth energy replenishment unit, SOH x is the health status of the energy replenishment battery in the xth energy replenishment unit, SOC x is the state of charge of the energy replenishment battery in the xth energy replenishment unit, v xis the voltage of the energy replenishment battery in the xth energy replenishment unit, 1≤x≤n, and n is the total number of energy replenishment units.

[0040] The above formula shows that the current reference instruction The value of When determining, it is determined by the ratio of the current capacity of the energy replenishment capacitor to the current total capacity of all batteries. The larger the ratio, the larger the allocated current. Embodiment 4:

[0041] This example is further designed on the basis of the first embodiment. The capacity and power configuration method of the energy storage power station of the present invention has the following DC / DC converter efficiencies for the PCS unit and each energy replenishment unit: , , … In the case of the above, the battery parameters also include the above efficiency. When configuring the capacity of the energy storage power station, the power dispatch instruction distributed according to the capacity ratio sent by the EMS unit to the battery circulation controller of the energy replenishment unit is the current reference instruction sent to the DC / DC converter of each energy replenishment unit. For the current reference instruction sent to the DC / DC converter of the xth energy replenishment unit, The charging and discharging states are shown as follows: When charging: ; In discharge state: ; In the formula, The power dispatch instruction of the energy storage power station sent by the EMS unit to the PCS unit; C 0 is the initial battery capacity, SOH 0 This is the health status of the battery when it is first installed. SOC 0 This is the initial battery charge status. v 0 Initial battery voltage ; C x is the capacity of the energy replenishment battery in the xth energy replenishment unit, SOH x is the health status of the energy replenishment battery in the xth energy replenishment unit, SOC x is the state of charge of the energy replenishment battery in the xth energy replenishment unit, v x is the voltage of the energy replenishment battery in the xth energy replenishment unit, 1≤x≤n, and n is the total number of energy replenishment units. Embodiment five:

[0042] This example is further designed on the basis of the above example. The capacity and power configuration method of the energy storage power station of the present invention is that the capacity of the initial installed battery should not be less than 1.05 times the contract capacity of the energy storage power station; or the capacity of the initial installed battery should at least meet the operation requirements of the energy storage power station during the 1-year warranty period; the capacity of the energy replenishment battery of the energy replenishment unit configured each time is 1 / 10~1 / 3 of the capacity of the initial installed battery. Embodiment six:

[0043] This example provides a device for realizing capacity and power configuration of an energy storage power station. The energy storage power station includes a pre-installed battery, a PCS unit, and an EMS unit. One end of the PCS unit is connected to the power grid, and the other end is connected to the pre-installed battery and the EMS unit respectively. The EMS unit is also connected to the pre-installed battery. The device for realizing capacity and power configuration of the energy storage power station also includes the following modules: The current total capacity calculation module obtains the battery parameters of all batteries in the energy storage power station and determines the current total capacity of all batteries; The contract capacity judgment module judges whether the current total capacity of all batteries meets the constraint condition of the contract capacity according to the determined current total capacity of all batteries; The capacity and power configuration module determines the capacity configuration scheme of the energy storage power station according to whether the current total capacity of all batteries meets the constraint conditions of the contract capacity; and determines the power configuration scheme of the energy storage power station in which the EMS unit sends power dispatch instructions to the PCS unit and the energy replenishment unit respectively; Update the iteration module, update the battery parameters of all batteries in the energy storage power station, and regenerate the capacity configuration plan and power configuration plan of the energy storage power station; The constraint condition of the contract capacity is that the current total capacity of all batteries ≥ the contract capacity; all batteries include initially installed batteries and rechargeable batteries; the battery parameters include battery state of charge, battery capacity, battery health status and battery voltage; The capacity configuration scheme of the energy storage power station includes: when the current total capacity of all batteries meets the constraint conditions of the contract capacity, no energy replenishment unit is configured, and when the current total capacity of all batteries does not meet the constraint conditions of the contract capacity, a single energy replenishment unit is configured; the power configuration scheme of the energy storage power station includes sending a PCS power dispatch instruction to the PCS unit, and sending a power dispatch instruction allocated according to the capacity ratio to the battery circulation controller of the energy replenishment unit; The energy replenishment unit is composed of a group of battery circulation controllers connected to a group of energy replenishment batteries. The energy replenishment unit is connected in parallel with the initial battery and is arranged between the PCS unit and the EMS unit. The battery circulation controller and the energy replenishment battery of the energy replenishment unit are respectively connected to the EMS unit. Embodiment seven:

[0044] This example provides an electronic device, which includes a memory and a processor. The memory stores a computer program, and the processor is used to call and run the computer program stored in the memory to execute the above method. Embodiment eight:

[0045] This example provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the steps of the above method are implemented. Embodiment nine:

[0046] In the further design of the embodiment, the capacity and power configuration method of the energy storage power station of the present invention includes: an initial battery, a PCS unit, an EMS unit and an energy replenishment unit, and the energy replenishment unit is composed of a DC / DC1 converter and an energy replenishment battery 1 connected in series. The PCS unit is the abbreviation of the power conversion system (Power Convert System), and the EMS unit is the abbreviation of the energy management system (Energy Management System).

[0047] The energy replenishment unit is connected in parallel with the initial battery between the PCS unit and the EMS unit, and the DC / DC1 converter and the energy replenishment battery 1 of the energy replenishment unit are connected to the EMS unit. One end of the PCS unit is connected to the power grid, and the other end is connected to the initial battery, the DC / DC1 converter and the EMS unit respectively. The EMS unit is connected to the initial battery, the energy replenishment battery 1, and the DC / DC1 converter respectively.

[0048] like Figure 6 As shown, the energy storage power station currently includes a group of initial batteries and a group of energy replenishment units.

[0049] The power configuration scheme is as follows: the EMS unit sends the PCS power scheduling instructions to the PCS unit respectively: , and the current reference command sent to the DC / DC1 converter of the energy replenishment unit is .

[0050] in, C 0 is the initial battery capacity, SOH 0 This is the health status of the battery when it is first installed. SOC 0 This is the initial battery charge status. v 0 Initial battery voltage , i 0 The initial battery current; C 1 To replenish battery capacity, SOH 1To replenish the battery health status, SOC 1 To replenish the battery charge state, v 1 To replenish the battery voltage, i 1 To replenish the battery current.

[0051] Application examples:

[0052] This example uses the configuration method of the existing energy storage power station and the configuration method of the energy storage power station battery of the present invention for actual comparative analysis: Existing solution: The contract capacity of the energy storage power station is 10MWh, and the contract capacity warranty period is 10 years. The contract power of the energy storage power station is 5MW, and a charge / discharge cycle is performed every day. That is, 365 times of charge and discharge per year, and 3650 times in 10 years. Usually, three groups of 20-foot battery containers are configured, and the capacity of each group of battery containers is 3.456MWh, and the initial installed capacity is 10.37MWh. Figure 7 This is the relationship curve between the number of battery charge / discharge cycles and the battery capacity attenuation rate. After 10 years, the battery capacity will decay to 80%. Figure 8 It shows that after 3650 times of charge / discharge, the battery capacity of 10.37MWh will decay to 8.4MWh. Therefore, the initial installed capacity of the energy storage power station battery needs to be increased to at least 12.5MWh to meet the 10MWh contract capacity requirement within the 10-year warranty period. If 3.456MWh 20-foot standard container battery cabinets are used, 4 groups are required to meet the requirement. Considering that a group of 3.456MWh 20-foot battery cabinets costs 2.5 million yuan, in order to meet the contract capacity within 10 years, the initial battery equipment investment will increase from 7.5 million yuan to 10 million yuan.

[0053] Solution of the present invention: Table 1 is the result of using the method of battery capacity replenishment and the control method of battery capacity allocation of the present invention. In the first year, three groups of 20-foot battery containers are configured. The capacity of each group of battery containers is 3.456MWh, and the initial installed capacity is 10.37MWh. The number of charge / discharges per year is set to 365 times, of which 1 charge and 1 discharge is one time. According to the attenuation of the power of the power station, supplementary units are added 6 times in the 2nd, 3rd, 4th, 6th, 7th and 10th years respectively, each time adding a set of 0.345MWh battery cabinets and a set of DC / DC converters, and a total of 2.07MWh of energy is replenished in 10 years. Fig. 9 and Fig.10The capacity and power configuration method of the energy storage power station of the present invention, the relationship between the battery operation years and the battery capacity attenuation are respectively shown. By configuring the energy replenishment battery capacity in batches within 10 years, it is ensured that the current total capacity of all batteries can always maintain a contract capacity greater than 10MWh and maintain a level greater than 100% of the contract capacity. After the contract capacity warranty period is completed in the 10th year, the power station capacity is still maintained at 10.17MWh, meeting the capacity requirements of the power station.

[0054] Each set of 0.345MWh battery cabinet costs 250,000 yuan, and each set of DC / DC converter costs 30,000 yuan. The total cost of adding 6 sets of battery cabinets and DC / DC converters in 10 years is 1.68 million yuan. Compared with the existing solution, the scheme of the present invention reduces the investment by 820,000 yuan, and the initial capital investment is reduced by 2.5 million yuan, a reduction of 25%. A large amount of working capital and construction costs are saved for the operation of the project.

[0055] An example of a battery cabinet applicable to the present invention may be a battery cabinet with a specification of 3.456MWh; or a battery cabinet with a specification of 0.345MWh.

[0056] Table 1: .

Claims

1. A capacity and power configuration method for an energy storage power station, the energy storage power station comprising an initial battery, a PCS unit and an EMS unit, one end of the PCS unit is connected to the power grid, and the other end is connected to the initial battery and the EMS unit respectively, and the EMS unit is also connected to the initial battery, characterized in that: The capacity and power configuration method of the energy storage power station comprises the following steps: Obtain the battery parameters of all batteries in the energy storage power station and determine the current total capacity of all batteries; According to the determined current total capacity of all batteries, judging whether the current total capacity of all batteries meets the constraint condition of the contract capacity; Determine the capacity configuration scheme of the energy storage power station according to the current total capacity of all batteries satisfying the constraint conditions of the contract capacity; and determine the power configuration scheme of the energy storage power station in which the EMS unit sends power dispatch instructions to the PCS unit and to the energy replenishment unit respectively; Update the battery parameters of all batteries in the energy storage power station and regenerate the capacity configuration plan and power configuration plan of the energy storage power station; The constraint condition of the contract capacity is that the current total capacity of all batteries ≥ the contract capacity; all batteries include initial installation batteries and rechargeable batteries; the battery parameters include battery state of charge, battery capacity, battery health status and battery voltage; The capacity configuration scheme of the energy storage power station includes: when the current total capacity of all batteries meets the constraint conditions of the contract capacity, no energy replenishment unit is configured, and when the current total capacity of all batteries does not meet the constraint conditions of the contract capacity, a single energy replenishment unit is configured; the power configuration scheme of the energy storage power station includes sending a PCS power dispatch instruction to the PCS unit, and sending a power dispatch instruction allocated according to the capacity ratio to the battery circulation controller of the energy replenishment unit; The energy replenishment unit is formed by connecting a group of battery circulation controllers and a group of energy replenishment batteries. The energy replenishment unit and the initial battery are connected in parallel between the PCS unit and the EMS unit, and the battery circulation controller of the energy replenishment unit is connected to the EMS unit.

2. The capacity and power configuration method of the energy storage power station according to claim 1, characterized in that: The calculation formula for the current total capacity of all batteries is as follows: When no energy replenishment unit is configured, ； When equipped with a charging unit, ； In the formula, C 0 is the initial battery capacity, SOH 0 This is the initial battery health status. SOC 0 This is the initial battery charge status. C x is the capacity of the energy replenishment battery in the xth energy replenishment unit, SOH x is the health status of the energy replenishment battery in the xth energy replenishment unit, SOC x is the state of charge of the energy replenishment battery in the xth energy replenishment unit, 1≤x≤n, and n is the total number of energy replenishment units.

3. The capacity and power configuration method of the energy storage power station according to claim 2, characterized in that: The energy replenishment unit is composed of a group of DC / DC converters and a group of energy replenishment batteries connected in series; the power scheduling instruction allocated according to capacity ratio refers to a current reference instruction for current / power allocation based on the ratio of the current capacity of the energy replenishment battery to the current total capacity of all batteries.

4. The capacity and power configuration method of the energy storage power station according to claim 3, characterized in that: For the case where the efficiency of the DC / DC converters of the PCS unit and each energy replenishment unit is 1, when configuring the capacity of the energy storage power station, the power dispatch instruction allocated according to the capacity ratio is the current reference instruction sent to the DC / DC converter of each energy replenishment unit, wherein the current reference instruction sent to the DC / DC converter of the xth energy replenishment unit is It is expressed as follows: ； In the formula, The power dispatch instruction sent by the EMS unit to the PCS unit; C 0 is the initial battery capacity, SOH 0 This is the initial battery health status. SOC 0 This is the initial battery charge status. C x is the capacity of the energy replenishment battery in the xth energy replenishment unit, SOH x is the health status of the energy replenishment battery in the xth energy replenishment unit, SOC x is the state of charge of the energy replenishment battery in the xth energy replenishment unit, 1≤x≤n, and n is the total number of energy replenishment units.

5. The capacity and power configuration method of the energy storage power station according to claim 3, characterized in that: The efficiencies of the DC / DC converters for the PCS unit and each energy replenishment unit are , , … In the case where the battery parameters also include the above efficiency, when the capacity of the energy storage power station is configured, the power dispatch instruction allocated according to the capacity ratio is a current reference instruction sent to the DC / DC converter of each energy replenishment unit, and a current reference instruction sent to the DC / DC converter of the xth energy replenishment unit. The charging and discharging states are shown as follows: When charging: ； In discharge state: ； In the formula, The power dispatch instruction of the energy storage power station sent by the EMS unit to the PCS unit; C 0 is the initial battery capacity, SOH 0 This is the initial battery health status. SOC 0 This is the initial battery charge status. v 0 The voltage of the battery when it is first installed; C x is the capacity of the energy replenishment battery in the xth energy replenishment unit, SOH x is the health status of the energy replenishment battery in the xth energy replenishment unit, SOC x is the state of charge of the energy replenishment battery in the xth energy replenishment unit, v x is the voltage of the energy-replenishing battery in the xth energy-replenishing unit, 1≤x≤n, and n is the total number of energy-replenishing units.

6. The capacity and power configuration method of the energy storage power station according to claim 1, characterized in that: The capacity of the initially installed battery should not be less than 1.05 times the contracted capacity of the energy storage power station; or the capacity of the initially installed battery should at least meet the operating requirements of the energy storage power station during the 1-year warranty period; the capacity of the energy replenishment battery of the energy replenishment unit configured each time should be 1 / 10 to 1 / 3 times the capacity of the initially installed battery.

7. The capacity and power configuration method of the energy storage power station according to claim 1, characterized in that: The initially installed batteries are batteries installed for the first time in the energy storage power station, or batteries that have been installed in the energy storage power station and are over-configured to meet the warranty period requirements. The initially installed batteries are one battery pack or multiple battery packs.

8. A device for realizing capacity and power configuration of an energy storage power station, the energy storage power station comprising a pre-installed battery, a PCS unit and an EMS unit, one end of the PCS unit is connected to the power grid, and the other end is respectively connected to the pre-installed battery and the EMS unit, and the EMS unit is also connected to the pre-installed battery, characterized in that: The device for realizing capacity and power configuration of the energy storage power station also includes the following modules: The current total capacity calculation module obtains the battery parameters of all batteries in the energy storage power station and determines the current total capacity of all batteries; The contract capacity judgment module judges whether the current total capacity of all batteries meets the constraint condition of the contract capacity according to the determined current total capacity of all batteries; The capacity and power configuration module determines the capacity configuration plan of the energy storage power station based on whether the current total capacity of all batteries meets the constraints of the contract capacity; and determining a power configuration scheme of the energy storage power station in which the EMS unit sends power dispatch instructions to the PCS unit and to the energy replenishment unit respectively; Update the iteration module, update the battery parameters of all batteries in the energy storage power station, and regenerate the capacity configuration plan and power configuration plan of the energy storage power station; The constraint condition of the contract capacity is that the current total capacity of all batteries ≥ the contract capacity; all batteries include initial installation batteries and charging batteries; The battery parameters include battery state of charge, battery capacity, battery health status and battery voltage; The capacity configuration scheme of the energy storage power station includes: when the current total capacity of all batteries meets the constraint conditions of the contract capacity, no energy replenishment unit is configured, and when the current total capacity of all batteries does not meet the constraint conditions of the contract capacity, a single energy replenishment unit is configured; the power configuration scheme of the energy storage power station includes sending a PCS power dispatch instruction to the PCS unit, and sending a power dispatch instruction allocated according to the capacity ratio to the battery circulation controller of the energy replenishment unit; The energy replenishment unit is composed of a group of battery circulation controllers connected to a group of energy replenishment batteries. The energy replenishment unit and the initially installed battery are connected in parallel between the PCS unit and the EMS unit. The battery circulation controller and the energy replenishment battery of the energy replenishment unit are respectively connected to the EMS unit.

9. An electronic device, characterized in that: The electronic device comprises a memory and a processor, wherein the memory stores a computer program, and the processor is configured to call and run the computer program stored in the memory to execute 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 steps of the method as claimed in any one of claims 1 to 7 are implemented.

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