Method, device and equipment for monitoring charge and discharge efficiency of centralized energy storage system and storage medium

Abstract

The invention belongs to the technical field of energy storage system monitoring, and discloses a centralized energy storage system charging and discharging efficiency monitoring method, device and equipment and a storage medium. The method comprises the following steps: acquiring charging and discharging data of the centralized energy storage system; acquiring battery configuration parameters of the centralized energy storage system, and determining nominal capacity according to the battery configuration parameters; determining the direct current side discharge capacity according to the nominal capacity, the battery storage attenuation coefficient, the health state, the discharge depth and the direct current side available power rate of the centralized energy storage system; according to the direct current side discharge capacity, the line loss data and set system charging auxiliary power supply loss, calculating first system side available energy and second system side available energy respectively; and determining the charging and discharging efficiency of the centralized energy storage system according to the first system side available energy and the second system side available energy. Through the above mode, the line loss data is integrated and the data such as the health degree of the centralized energy storage system is combined, so that the reliability and the accuracy of the monitoring result are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage system monitoring, and in particular to a method, device, equipment and storage medium for monitoring the charging and discharging efficiency of a centralized energy storage system. Background Art

[0002] With the rapid development of electrochemical energy storage technology, centralized energy storage systems, due to their high energy density and scalable application, have become key equipment in fields such as grid frequency regulation and renewable energy consumption. However, existing technologies for monitoring charge and discharge efficiency have the following limitations: existing methods fail to establish a mandatory verification relationship between theoretically calculated values ​​and actual output energy, and fail to consider factors in actual operating conditions, such as line losses and the health of the energy storage system. This makes monitoring results susceptible to data anomalies, resulting in insufficient reliability and low accuracy.

[0003] The above content is only used to assist in understanding the technical solution of the present invention and does not constitute an admission that the above content is prior art. Summary of the Invention

[0004] The main purpose of the present invention is to provide a method, device, equipment and storage medium for monitoring the charging and discharging efficiency of a centralized energy storage system, aiming to solve the technical problems that the monitoring results are easily interfered by data anomalies, lack reliability and have low accuracy.

[0005] To achieve the above objectives, the present invention provides a method for monitoring the charging and discharging efficiency of a centralized energy storage system, the method comprising the following steps:

[0006] Acquire charging and discharging data of the centralized energy storage system, the charging and discharging data including input energy, output energy, and line loss data, the line loss data including DC side line loss, energy storage converter bus line loss, battery cabinet to medium voltage switchgear line loss, and medium voltage side line loss;

[0007] Obtaining battery configuration parameters of the centralized energy storage system, and determining a nominal capacity based on the battery configuration parameters;

[0008] Determining a DC side discharge amount based on the nominal capacity, a battery storage attenuation coefficient, a health state, a discharge depth, and a DC side available power rate of the centralized energy storage system;

[0009] Calculating the first system-side available energy and the second system-side available energy respectively according to the DC side discharge amount, the line loss data, and the set system charging auxiliary power supply loss;

[0010] The charging and discharging efficiency of the centralized energy storage system is determined according to the first system-side available energy and the second system-side available energy.

[0011] In some embodiments, determining the nominal capacity according to the battery configuration parameters includes:

[0012] Determine the cell capacity, number of series connections, number of parallel connections, and nominal voltage based on the battery configuration parameters;

[0013] The nominal capacity is calculated according to the cell capacity, number of series connections, number of parallel connections and nominal voltage. The calculation formula is E1=2×(S×P×Ah×V), where E1 is the nominal capacity, Ah is the cell capacity, S is the number of series connections, P is the number of parallel connections, and V is the nominal voltage.

[0014] In some embodiments, determining the DC side discharge amount according to the nominal capacity, the battery storage attenuation coefficient, the health state, the discharge depth, and the DC side available power rate of the centralized energy storage system includes:

[0015] determining an energy correction value based on a battery storage attenuation coefficient, a health state, a depth of discharge, and a DC side available power rate of the centralized energy storage system;

[0016] The DC side discharge capacity is determined based on the energy correction value and the nominal capacity. The calculation formula is E2=E1×ΔP, where E2 is the DC side discharge capacity, ΔP is the energy correction value, and ΔP=E d ×SOH×DOD×Q,E d is storage decay, SOH is state of health, DOD is depth of discharge, and Q is the rate of available charge on the DC side.

[0017] In some embodiments, respectively calculating the first system-side available energy and the second system-side available energy based on the DC side discharge amount, the line loss data, and the set system charging auxiliary power supply loss includes:

[0018] determining a DC side charge amount according to the DC side discharge amount;

[0019] determining the first system-side available energy according to the DC side discharge amount, the line loss data, and the set system charging auxiliary power supply loss;

[0020] The second system-side available energy is determined according to the DC side charging amount, the line loss data, and the set system charging auxiliary power supply loss.

[0021] In some embodiments, determining the DC side charge amount based on the DC side discharge amount includes:

[0022] Obtaining a preset battery round-trip efficiency on the DC side of the centralized energy storage system;

[0023] The DC side charge capacity is determined according to the DC side charge capacity and the preset battery round-trip efficiency, and the calculation formula is E3=E2 / RTE, wherein E3 is the DC side charge capacity, E2 is the DC side discharge capacity, and RTE is the preset battery round-trip efficiency.

[0024] In some embodiments, the calculation formula of the available energy on the first system side is A=E2*loss1*loss2*loss3*loss4-P loss , A is the available energy on the first system side, E2 is the discharge amount on the DC side, loss1 is the line loss on the DC side, loss2 is the bus line loss of the energy storage converter, loss3 is the line loss from the battery cabinet to the medium voltage switchgear, loss4 is the line loss on the medium voltage side, P loss Charge auxiliary power loss for the set system;

[0025] The calculation formula of the available energy on the second system side is B=E3*loss1*loss2*loss3*loss4+P loss , B is the available energy on the second system side, E3 is the DC side charge capacity, loss1 is the DC side line loss, loss2 is the energy storage converter bus line loss, loss3 is the battery cabinet to medium voltage switchgear line loss, loss4 is the medium voltage side line loss, P loss Charges the set system auxiliary power loss.

[0026] In some embodiments, the method further comprises:

[0027] comparing the first system-side available energy and the second system-side available energy with the output energy respectively;

[0028] If both the first system-side available energy and the second system-side energy do not exceed the output energy, outputting the charge-discharge efficiency;

[0029] If the first system-side available energy or the second system-side energy is greater than the output energy, the charge and discharge efficiency is recalculated.

[0030] In addition, to achieve the above objectives, the present invention further proposes a centralized energy storage system charge and discharge efficiency monitoring system, the centralized energy storage system charge and discharge efficiency monitoring system comprising:

[0031] An acquisition module is used to obtain charging and discharging data of the centralized energy storage system, wherein the charging and discharging data includes input energy, output energy, and line loss data. The line loss data includes DC side line loss, energy storage converter bus line loss, battery cabinet to medium voltage switchgear line loss, and medium voltage side line loss;

[0032] a calculation module, configured to obtain battery configuration parameters of the centralized energy storage system and determine a nominal capacity based on the battery configuration parameters;

[0033] The calculation module is configured to determine the DC side discharge amount based on the nominal capacity, the battery storage attenuation coefficient, the health state, the discharge depth, and the DC side available power rate of the centralized energy storage system;

[0034] The calculation module is used to calculate the first system side available energy and the second system side available energy respectively according to the DC side discharge amount, the line loss data, and the set system charging auxiliary power supply loss;

[0035] The calculation module is used to determine the charging and discharging efficiency of the centralized energy storage system based on the first system-side available energy and the second system-side available energy.

[0036] In addition, to achieve the above-mentioned objectives, the present invention also proposes a centralized energy storage system charge and discharge efficiency monitoring device, which includes: a memory, a processor, and a centralized energy storage system charge and discharge efficiency monitoring program stored in the memory and executable on the processor, wherein the centralized energy storage system charge and discharge efficiency monitoring program is configured to implement the steps of the centralized energy storage system charge and discharge efficiency monitoring method described above.

[0037] In addition, to achieve the above-mentioned purpose, the present invention also proposes a storage medium, on which a centralized energy storage system charge and discharge efficiency monitoring program is stored. When the centralized energy storage system charge and discharge efficiency monitoring program is executed by a processor, the steps of the centralized energy storage system charge and discharge efficiency monitoring method described above are implemented.

[0038] The present invention obtains the charge and discharge data of a centralized energy storage system; obtains the battery configuration parameters of the centralized energy storage system, and determines the nominal capacity based on the battery configuration parameters; determines the DC side discharge amount based on the nominal capacity, the battery storage attenuation coefficient, health status, discharge depth, and DC side available power rate of the centralized energy storage system; calculates the first system side available energy and the second system side available energy based on the DC side discharge amount, the line loss data, and the set system charging auxiliary power loss; and determines the charge and discharge efficiency of the centralized energy storage system based on the first system side available energy and the second system side available energy. Through the above method, the line loss data is integrated and combined with the health data of the centralized energy storage system, thereby improving the reliability and accuracy of the monitoring results. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a flow chart of a first embodiment of a method for monitoring charging and discharging efficiency of a centralized energy storage system according to the present invention;

[0040] Figure 2 This is a structural block diagram of the first embodiment of the centralized energy storage system charge and discharge efficiency monitoring system of the present invention.

[0041] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0042] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0043] The embodiment of the present invention provides a method for monitoring the charging and discharging efficiency of a centralized energy storage system. Figure 1 , Figure 1 This is a flow chart of a first embodiment of a method for monitoring charging and discharging efficiency of a centralized energy storage system according to the present invention.

[0044] In this embodiment, the centralized energy storage system charge and discharge efficiency monitoring method includes the following steps:

[0045] Step S10: Acquire charging and discharging data of the centralized energy storage system.

[0046] In this embodiment, the execution subject of this embodiment is a centralized energy storage system charge and discharge efficiency monitoring device, wherein the centralized energy storage system charge and discharge efficiency monitoring device has functions such as data processing, data communication and program running. The centralized energy storage system charge and discharge efficiency monitoring device can be a computer terminal device or other network device, and of course it can also be other devices with similar functions, and this embodiment does not limit this.

[0047] It should be noted that with the rapid development of electrochemical energy storage technology, centralized energy storage systems, due to their high energy density and large-scale application advantages, have become key equipment in fields such as grid frequency regulation and renewable energy consumption. However, existing technologies for monitoring charge and discharge efficiency have the following limitations: existing methods do not establish a mandatory verification relationship between theoretically calculated values ​​and actual output energy, and do not consider factors in actual operating conditions, such as line losses and the health of the energy storage system. As a result, monitoring results are susceptible to data anomalies, lack reliability, and have low accuracy.

[0048] In order to solve the above technical problems, in this embodiment, the charging and discharging data of the centralized energy storage system is obtained; the battery configuration parameters of the centralized energy storage system are obtained, and the nominal capacity is determined according to the battery configuration parameters; the DC side discharge amount is determined according to the nominal capacity, the battery storage attenuation coefficient, health status, discharge depth and DC side available power rate of the centralized energy storage system; the first system side available energy and the second system side available energy are calculated according to the DC side discharge amount and the line loss data and the set system charging auxiliary power supply loss; the charging and discharging efficiency of the centralized energy storage system is determined according to the first system side available energy and the second system side available energy. Through the above method, the line loss data is integrated and combined with the health data of the centralized energy storage system, thereby improving the reliability and accuracy of the monitoring results. Specifically, it can be achieved in the following way.

[0049] In a specific implementation, in this embodiment, it is necessary to first obtain the charging and discharging data of the centralized energy storage system, wherein the charging and discharging data include input energy, output energy and line loss data, and the line loss data includes DC side line loss, energy storage converter bus line loss, battery cabinet to medium voltage switchgear line loss and medium voltage side line loss. The input energy is used to measure the subsequent nominal capacity, and it is necessary to meet the requirement that the input energy does not exceed the nominal capacity. The output energy is used to measure the final system-side available energy, and specifically, the first system-side available energy may not exceed the output capacity. The line loss data is used to participate in the subsequent calculation of the charging efficiency. Adding line loss data can make the monitoring results more consistent with the actual state, thereby improving the accuracy of the charging and discharging efficiency monitoring.

[0050] Step S20: Obtain battery configuration parameters of the centralized energy storage system, and determine the nominal capacity according to the battery configuration parameters.

[0051] In a specific implementation, before determining the charge and discharge efficiency, the nominal capacity needs to be determined in this embodiment, and the nominal capacity is based on the battery configuration parameters. Among them, the battery configuration parameters include cell capacity, number of series connections, number of parallel connections and nominal voltage. The nominal capacity can be calculated from these parameters. The calculation formula is E1=2×(S×P×Ah×V), where E1 is the nominal capacity, Ah is the cell capacity, S is the number of series connections, P is the number of parallel connections, and V is the nominal voltage. In addition, in combination with step S10, after obtaining the nominal capacity, the calculated nominal capacity can also be compared with the input capacity in this embodiment. If the input capacity is less than or equal to the nominal capacity, the subsequent charge and discharge efficiency calculation can be performed. On the contrary, if the input capacity exceeds the nominal capacity, it means that the nominal capacity calculation is incorrect, and the relevant parameters are re-obtained for calculation.

[0052] Step S30: determining the DC side discharge capacity according to the nominal capacity, the battery storage attenuation coefficient, the health state, the discharge depth and the DC side available power rate of the centralized energy storage system.

[0053] In a specific implementation, in this embodiment, the energy correction value can be determined based on the battery storage attenuation coefficient, health status, discharge depth and DC side available power rate of the centralized energy storage system. The calculation formula is △P=E d ×SOH×DOD×Q,E d =Storage decay, SOH is state of health, DOD is depth of discharge, and Q is the DC side available charge rate. After obtaining the energy correction value, combined with the nominal capacity calculated above, the DC side discharge capacity can be calculated using the formula E2 = E1 × ΔP, where E2 is the DC side discharge capacity and ΔP is the energy correction value.

[0054] Step S40: Calculating the first system-side available energy and the second system-side available energy respectively according to the DC side discharge amount, the line loss data, and the set system charging auxiliary power supply loss.

[0055] In a specific implementation, the first system-side available energy in this embodiment can be determined based on the DC-side discharge capacity and line loss data, as well as the set system charging auxiliary power supply loss. The second system-side available energy can be determined based on the DC-side charge capacity and line loss data, as well as the set system charging auxiliary power supply loss. The DC-side charge capacity can be determined based on the DC-side discharge capacity, specifically by obtaining a preset battery round-trip efficiency on the DC side of the centralized energy storage system; and the DC-side charge capacity is determined based on the DC-side charge capacity and the preset battery round-trip efficiency, using the calculation formula E3 = E2 / RTE, where E3 is the DC-side charge capacity, E2 is the DC-side discharge capacity, and RTE is the preset battery round-trip efficiency.

[0056] Furthermore, the calculation formula of the available energy on the first system side is A=E2*loss1*loss2*loss3*loss4-P loss , A is the available energy on the first system side, E2 is the discharge amount on the DC side, loss1 is the line loss on the DC side, loss2 is the bus line loss of the energy storage converter, loss3 is the line loss from the battery cabinet to the medium voltage switchgear, loss4 is the line loss on the medium voltage side, P loss The calculation formula of the available energy on the second system side is B=E3*loss1*loss2*loss3*loss4+P loss , B is the available energy on the second system side, E3 is the DC side charge capacity, loss1 is the DC side line loss, loss2 is the energy storage converter bus line loss, loss3 is the battery cabinet to medium voltage switchgear line loss, loss4 is the medium voltage side line loss, P loss Charges the set system auxiliary power loss.

[0057] Step S50: determining the charging and discharging efficiency of the centralized energy storage system according to the first system-side available energy and the second system-side available energy.

[0058] In this embodiment, the charge and discharge efficiency of the centralized energy storage system can be directly calculated based on the available energy on the first system side and the available energy on the second system side. The specific calculation formula is C = A / B, where A is the available energy on the first system side, B is the available energy on the second system side, and C is the charge and discharge efficiency of the centralized energy storage system.

[0059] Furthermore, in this embodiment, to ensure the validity of the final charge and discharge efficiency, the first system-side available energy and the second system-side available energy are each compared with the output energy. If neither the first system-side available energy nor the second system-side energy exceeds the output energy, the charge and discharge efficiency is considered valid and is output directly. If either the first system-side available energy or the second system-side energy exceeds the output energy, the charge and discharge efficiency is recalculated.

[0060] In this embodiment, the charging and discharging data of the centralized energy storage system is obtained; the battery configuration parameters of the centralized energy storage system are obtained, and the nominal capacity is determined based on the battery configuration parameters; the DC side discharge amount is determined based on the nominal capacity, the battery storage attenuation coefficient of the centralized energy storage system, the health status, the discharge depth, and the DC side available power rate; the first system side available energy and the second system side available energy are calculated based on the DC side discharge amount and the line loss data and the set system charging auxiliary power loss; the charging and discharging efficiency of the centralized energy storage system is determined based on the first system side available energy and the second system side available energy. Through the above method, the line loss data is integrated and combined with the health data of the centralized energy storage system, thereby improving the reliability and accuracy of the monitoring results.

[0061] In addition, an embodiment of the present invention further proposes a storage medium, on which a centralized energy storage system charge and discharge efficiency monitoring program is stored. When the centralized energy storage system charge and discharge efficiency monitoring program is executed by a processor, the steps of the centralized energy storage system charge and discharge efficiency monitoring method described above are implemented.

[0062] Reference Figure 2 , Figure 2 This is a structural block diagram of the first embodiment of the centralized energy storage system charging and discharging efficiency monitoring device of the present invention.

[0063] like Figure 2 As shown, the centralized energy storage system charge and discharge efficiency monitoring device proposed in the embodiment of the present invention includes:

[0064] Acquisition module 10, for acquiring charging and discharging data of the centralized energy storage system, the charging and discharging data including input energy, output energy, and line loss data, the line loss data including DC side line loss, energy storage converter bus line loss, battery cabinet to medium voltage switchgear line loss, and medium voltage side line loss;

[0065] a calculation module 20, configured to obtain battery configuration parameters of the centralized energy storage system and determine a nominal capacity based on the battery configuration parameters;

[0066] The calculation module 20 is configured to determine the DC side discharge capacity based on the nominal capacity, the battery storage attenuation coefficient, the health status, the discharge depth, and the DC side available power rate of the centralized energy storage system;

[0067] The calculation module 20 is configured to calculate the first system-side available energy and the second system-side available energy respectively according to the DC side discharge amount, the line loss data, and the set system charging auxiliary power supply loss;

[0068] The calculation module 20 is configured to determine a charge and discharge efficiency of the centralized energy storage system based on the first system-side available energy and the second system-side available energy.

[0069] In this embodiment, the charging and discharging data of the centralized energy storage system is obtained; the battery configuration parameters of the centralized energy storage system are obtained, and the nominal capacity is determined based on the battery configuration parameters; the DC side discharge amount is determined based on the nominal capacity, the battery storage attenuation coefficient of the centralized energy storage system, the health status, the discharge depth, and the DC side available power rate; the first system side available energy and the second system side available energy are calculated based on the DC side discharge amount and the line loss data and the set system charging auxiliary power loss; the charging and discharging efficiency of the centralized energy storage system is determined based on the first system side available energy and the second system side available energy. Through the above method, the line loss data is integrated and combined with the health data of the centralized energy storage system, thereby improving the reliability and accuracy of the monitoring results.

[0070] In some embodiments, the calculation module 20 is used to determine the cell capacity, the number of series connections, the number of parallel connections, and the nominal voltage according to the battery configuration parameters;

[0071] The nominal capacity is calculated according to the cell capacity, number of series connections, number of parallel connections and nominal voltage. The calculation formula is E1=2×(S×P×Ah×V), where E1 is the nominal capacity, Ah is the cell capacity, S is the number of series connections, P is the number of parallel connections, and V is the nominal voltage.

[0072] In some embodiments, the calculation module 20 is configured to determine an energy correction value based on a battery storage attenuation coefficient, a health state, a discharge depth, and a DC side available power rate of the centralized energy storage system;

[0073] The DC side discharge capacity is determined based on the energy correction value and the nominal capacity. The calculation formula is E2=E1×ΔP, where E2 is the DC side discharge capacity, ΔP is the energy correction value, and ΔP=E d ×SOH×DOD×Q,E d is storage decay, SOH is state of health, DOD is depth of discharge, and Q is the rate of available charge on the DC side.

[0074] In some embodiments, the calculation module 20 is configured to determine the DC side charge amount based on the DC side discharge amount;

[0075] determining the first system-side available energy according to the DC side discharge amount, the line loss data, and the set system charging auxiliary power supply loss;

[0076] The second system-side available energy is determined according to the DC side charging amount, the line loss data, and the set system charging auxiliary power supply loss.

[0077] In some embodiments, the calculation module 20 is used to obtain a preset battery round-trip efficiency on the DC side of the centralized energy storage system;

[0078] The DC side charge capacity is determined according to the DC side charge capacity and the preset battery round-trip efficiency, and the calculation formula is E3=E2 / RTE, wherein E3 is the DC side charge capacity, E2 is the DC side discharge capacity, and RTE is the preset battery round-trip efficiency.

[0079] In some embodiments, the calculation formula of the available energy on the first system side is A=E2*loss1*loss2*loss3*loss4-P loss , A is the available energy on the first system side, E2 is the discharge amount on the DC side, loss1 is the line loss on the DC side, loss2 is the bus line loss of the energy storage converter, loss3 is the line loss from the battery cabinet to the medium voltage switchgear, loss4 is the line loss on the medium voltage side, P loss Charge auxiliary power loss for the set system;

[0080] The calculation formula of the available energy on the second system side is B=E3*loss1*loss2*loss3*loss4+P loss , B is the available energy on the second system side, E3 is the DC side charge capacity, loss1 is the DC side line loss, loss2 is the energy storage converter bus line loss, loss3 is the battery cabinet to medium voltage switchgear line loss, loss4 is the medium voltage side line loss, P loss Charges the set system auxiliary power loss.

[0081] In some embodiments, the calculation module 20 is configured to compare the first system-side available energy and the second system-side available energy with the output energy respectively;

[0082] If both the first system-side available energy and the second system-side energy do not exceed the output energy, outputting the charge-discharge efficiency;

[0083] If the first system-side available energy or the second system-side energy is greater than the output energy, the charge and discharge efficiency is recalculated.

[0084] An embodiment of the present application also provides a centralized energy storage system charge and discharge efficiency monitoring device, including a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other via the communication bus, and the memory is used to store a centralized energy storage system charge and discharge efficiency monitoring program; the processor is used to implement the above-mentioned centralized energy storage system charge and discharge efficiency monitoring method when executing the program stored in the memory.

[0085] The communication bus mentioned in the centralized energy storage system charge and discharge efficiency monitoring device can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. This communication bus can be divided into an address bus, a data bus, a control bus, etc.

[0086] The communication interface is used for communication between the above-mentioned centralized energy storage system charge and discharge efficiency monitoring device and other devices.

[0087] The memory may include random access memory (RAM) or non-volatile memory (NVM), such as at least one disk storage. Alternatively, the memory may be at least one storage device located remote from the processor.

[0088] The above-mentioned processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0089] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When software is used for implementation, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website, computer, server or data center to another website, computer, server or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrations. The available medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state drive (SSD)).

[0090] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0091] Each embodiment in this specification is described in a related manner. Similar parts between the various embodiments can be referred to in conjunction with each other. Each embodiment focuses on the differences between the other embodiments. In particular, the system embodiment is generally similar to the method embodiment, so the description is relatively simple. For related parts, refer to the description of the method embodiment.

[0092] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

[0093] It should be understood that the above is only an example and does not constitute any limitation to the technical solution of the present invention. In specific applications, those skilled in the art can make settings as needed, and the present invention does not impose any limitation on this.

[0094] It should be noted that the workflow described above is merely illustrative and does not limit the scope of protection of the present invention. In practical applications, technicians in this field can select part or all of it according to actual needs to achieve the purpose of the embodiment scheme, and no limitation is made here.

[0095] In addition, for technical details not fully described in this embodiment, reference can be made to the centralized energy storage system charging and discharging efficiency monitoring method provided in any embodiment of the present invention, and will not be repeated here.

[0096] In addition, it should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or system. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or system comprising the element.

[0097] The serial numbers of the above embodiments of the present invention are for description only and do not represent the advantages or disadvantages of the embodiments.

[0098] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, or of course by hardware, but in many cases the former is a better embodiment. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product is stored in a storage medium (such as a read-only memory (ROM) / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for enabling a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present invention.

[0099] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

[0100] It is understandable that the system provided by the embodiment of the present invention corresponds to the method provided by the embodiment of the present invention, and the explanation, examples and beneficial effects of the relevant contents can refer to the corresponding parts of the above method.

Claims

1. A method for monitoring the charging and discharging efficiency of a centralized energy storage system, characterized in that: The centralized energy storage system charge and discharge efficiency monitoring method includes: Acquire charging and discharging data of the centralized energy storage system, the charging and discharging data including input energy, output energy, and line loss data, the line loss data including DC side line loss, energy storage converter bus line loss, battery cabinet to medium voltage switchgear line loss, and medium voltage side line loss; Obtaining battery configuration parameters of the centralized energy storage system, and determining a nominal capacity based on the battery configuration parameters; Determining a DC side discharge amount based on the nominal capacity, a battery storage attenuation coefficient, a health state, a discharge depth, and a DC side available power rate of the centralized energy storage system; Calculating the first system-side available energy and the second system-side available energy respectively according to the DC side discharge amount, the line loss data, and the set system charging auxiliary power supply loss; The charging and discharging efficiency of the centralized energy storage system is determined according to the first system-side available energy and the second system-side available energy.

2. The method for monitoring charging and discharging efficiency of a centralized energy storage system according to claim 1, wherein: The determining the nominal capacity according to the battery configuration parameters includes: Determine the cell capacity, number of series connections, number of parallel connections, and nominal voltage based on the battery configuration parameters; The nominal capacity is calculated according to the cell capacity, number of series connections, number of parallel connections and nominal voltage. The calculation formula is E1=2×(S×P×Ah×V), where E1 is the nominal capacity, Ah is the cell capacity, S is the number of series connections, P is the number of parallel connections, and V is the nominal voltage.

3. The method for monitoring charging and discharging efficiency of a centralized energy storage system according to claim 2, wherein: Determining the DC side discharge amount according to the nominal capacity, the battery storage attenuation coefficient, the health state, the discharge depth, and the DC side available power rate of the centralized energy storage system includes: determining an energy correction value based on a battery storage attenuation coefficient, a health state, a depth of discharge, and a DC side available power rate of the centralized energy storage system; The DC side discharge capacity is determined based on the energy correction value and the nominal capacity. The calculation formula is E2=E1×ΔP, where E2 is the DC side discharge capacity, ΔP is the energy correction value, and ΔP=E d ×SOH×DOD×Q,E d is storage decay, SOH is state of health, DOD is depth of discharge, and Q is the rate of available charge on the DC side.

4. The method for monitoring charging and discharging efficiency of a centralized energy storage system according to claim 1, wherein: The calculating the first system side available energy and the second system side available energy respectively according to the DC side discharge amount, the line loss data, and the set system charging auxiliary power supply loss includes: determining a DC side charge amount according to the DC side discharge amount; determining the first system-side available energy according to the DC side discharge amount, the line loss data, and the set system charging auxiliary power supply loss; The second system-side available energy is determined according to the DC side charging amount, the line loss data, and the set system charging auxiliary power supply loss.

5. The method for monitoring charging and discharging efficiency of a centralized energy storage system according to claim 4, wherein: The determining of the DC side charge amount according to the DC side discharge amount includes: Obtaining a preset battery round-trip efficiency on the DC side of the centralized energy storage system; The DC side charge capacity is determined according to the DC side charge capacity and the preset battery round-trip efficiency, and the calculation formula is E3=E2 / RTE, wherein E3 is the DC side charge capacity, E2 is the DC side discharge capacity, and RTE is the preset battery round-trip efficiency.

6. The method for monitoring charging and discharging efficiency of a centralized energy storage system according to claim 4, wherein: The calculation formula of the available energy on the first system side is A=E2*loss1*loss2*loss3*loss4-P loss , A is the available energy on the first system side, E2 is the discharge amount on the DC side, loss1 is the line loss on the DC side, loss2 is the bus line loss of the energy storage converter, loss3 is the line loss from the battery cabinet to the medium voltage switchgear, loss4 is the line loss on the medium voltage side, P loss Charge auxiliary power loss for the set system; The calculation formula of the available energy on the second system side is B=E3*loss1*loss2*loss3*loss4+P loss , B is the available energy on the second system side, E3 is the DC side charge capacity, loss1 is the DC side line loss, loss2 is the energy storage converter bus line loss, loss3 is the battery cabinet to medium voltage switchgear line loss, loss4 is the medium voltage side line loss, P loss Charges the set system auxiliary power loss.

7. The method for monitoring charging and discharging efficiency of a centralized energy storage system according to claim 1, wherein: The method further comprises: comparing the first system-side available energy and the second system-side available energy with the output energy respectively; If both the first system-side available energy and the second system-side energy do not exceed the output energy, outputting the charge-discharge efficiency; If the first system-side available energy or the second system-side energy is greater than the output energy, the charge and discharge efficiency is recalculated.

8. A centralized energy storage system charge and discharge efficiency monitoring device, characterized in that: The centralized energy storage system charge and discharge efficiency monitoring device includes: An acquisition module is used to obtain charging and discharging data of the centralized energy storage system, wherein the charging and discharging data includes input energy, output energy, and line loss data. The line loss data includes DC side line loss, energy storage converter bus line loss, battery cabinet to medium voltage switchgear line loss, and medium voltage side line loss; a calculation module, configured to obtain battery configuration parameters of the centralized energy storage system and determine a nominal capacity based on the battery configuration parameters; The calculation module is configured to determine the DC side discharge amount based on the nominal capacity, the battery storage attenuation coefficient, the health state, the discharge depth, and the DC side available power rate of the centralized energy storage system; The calculation module is used to calculate the first system side available energy and the second system side available energy respectively according to the DC side discharge amount, the line loss data, and the set system charging auxiliary power supply loss; The calculation module is used to determine the charging and discharging efficiency of the centralized energy storage system based on the first system-side available energy and the second system-side available energy.

9. A centralized energy storage system charge and discharge efficiency monitoring device, characterized in that: The centralized energy storage system charge and discharge efficiency monitoring device includes: a memory, a processor, and a centralized energy storage system charge and discharge efficiency monitoring program stored in the memory and executable on the processor. The centralized energy storage system charge and discharge efficiency monitoring program is configured to implement the steps of the centralized energy storage system charge and discharge efficiency monitoring method according to any one of claims 1 to 7.

10. A storage medium, characterized in that: The storage medium stores a centralized energy storage system charge and discharge efficiency monitoring program, which, when executed by the processor, implements the steps of the centralized energy storage system charge and discharge efficiency monitoring method according to any one of claims 1 to 7.

Images