A performance evaluation method and device for energy storage power station

Abstract

The present application proposes a performance evaluation method and device for an energy storage power station, and relates to the field of energy storage power generation technology. The present application collects performance-related parameters of the energy storage power station during the evaluation period; based on the performance-related parameters, calculates the energy efficiency index values ​​corresponding to the energy storage power station in multiple evaluation dimensions, wherein the multiple evaluation dimensions include at least the energy storage power station dimension, the collector line dimension, the energy storage unit dimension, the battery cluster dimension, the battery plug-in box dimension, and the energy storage device dimension; and performs a performance evaluation on the energy storage power station based on the energy efficiency index value. The present application provides a more granular energy consumption analysis method, which optimizes the precision of the energy consumption analysis of the energy storage power station, and can capture and accurately identify problems and potential hidden dangers that may occur during the operation of the energy storage power station in real time, which improves the safety of the energy storage power station to a certain extent and effectively reduces potential risks.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage and power generation, and in particular to a performance evaluation method and device for an energy storage power station. Background Art

[0002] With the large-scale access of renewable energy to the power grid, the power system faces the challenges of large load fluctuations and imbalance between supply and demand. Energy storage power stations can achieve temporal and spatial decoupling of power production and consumption by storing electricity during high-demand periods and releasing it during low-demand periods, thereby enhancing the flexibility and reliability of the power system. However, although energy storage technology plays an important role in regulating grid load and improving the stability of power systems, a certain amount of energy loss is inevitable during the energy conversion process, which seriously affects the overall efficiency of the energy storage system. Analyzing the main sources of energy loss in energy storage operation and performing quantitative calculations are crucial to improving the overall efficiency of power plants and taking targeted loss reduction measures. Summary of the invention

[0003] The present disclosure provides a performance evaluation method and device for an energy storage power station, so as to at least solve the problem of analyzing the main sources of power loss in energy storage operation and performing quantitative calculation in the related art.

[0004] The first aspect of the present application proposes a performance evaluation method for an energy storage power station, comprising: collecting performance-related parameters of the energy storage power station within an evaluation period; calculating, based on the performance-related parameters, energy efficiency index values ​​corresponding to the energy storage power station in multiple evaluation dimensions, wherein the multiple evaluation dimensions include at least an energy storage power station dimension, a collection line dimension, an energy storage unit dimension, a battery cluster dimension, a battery plug-in box dimension, and an energy storage device dimension; and performing performance evaluation on the energy storage power station based on the energy efficiency index values.

[0005] According to one embodiment of the present application, the energy efficiency index value of the energy storage power station dimension includes the comprehensive efficiency of the energy storage power station, the energy storage loss rate, the station power consumption rate and the transformer and distribution loss. The method for determining the energy efficiency index value of the energy storage power station dimension includes: calculating the comprehensive efficiency of the energy storage power station based on the online power of the energy storage power station and the offline power of the energy storage power station during the evaluation period; calculating the energy storage loss rate based on the sum of the charged amounts of all energy storage units included in the energy storage power station, the sum of the discharged amounts of all energy storage units included in the energy storage power station, and the offline power of the energy storage power station during the evaluation period; calculating the station power consumption rate based on the total station power consumption of the energy storage power station and the offline power of the energy storage power station during the evaluation period; calculating the transformer and distribution loss corresponding to the evaluation period based on the comprehensive efficiency of the energy storage power station, the energy storage loss rate and the station power consumption rate.

[0006] According to one embodiment of the present application, the energy efficiency index value of the collection circuit dimension includes the charge-discharge energy conversion efficiency of the collection circuit. The method for determining the energy efficiency index value of the collection circuit dimension includes: for any collection circuit, the charge-discharge energy conversion efficiency of the collection circuit is calculated based on the total discharge amount of each energy storage unit connected to the collection circuit within the evaluation period and the total charge amount of each energy storage unit connected to the collection circuit.

[0007] According to one embodiment of the present application, the energy efficiency index value of the energy storage unit dimension includes the charge and discharge energy conversion efficiency of the energy storage unit. The method for determining the energy efficiency index value of the energy storage unit dimension includes: for any energy storage unit, the charge and discharge energy conversion efficiency of the energy storage unit is calculated based on the total discharge amount of the energy storage unit and the total charge amount of the energy storage unit during the evaluation period.

[0008] According to one embodiment of the present application, the energy storage unit includes multiple battery stacks, the battery stack includes multiple battery clusters, the battery cluster is integrated with a first metering chip for collecting performance-related parameters of the battery cluster, the energy efficiency index value of the battery cluster dimension includes the charge and discharge energy conversion efficiency of the battery cluster and the standby energy consumption of the battery cluster, and the method for determining the energy efficiency index value of the battery cluster dimension includes: for any battery cluster, the charge and discharge energy conversion efficiency of the battery cluster is calculated based on the total discharge amount of the battery cluster and the total charge amount of the battery cluster during an evaluation period; for any battery cluster, the standby energy consumption of the battery cluster is calculated based on the standby energy consumption of the battery cluster and the total charge amount of the battery cluster during the evaluation period.

[0009] According to an embodiment of the present application, a battery cluster includes multiple battery boxes, and a second metering chip for collecting performance-related parameters of the battery boxes is integrated on the battery boxes. The energy efficiency index value of the battery box dimension includes the charge and discharge energy conversion efficiency of the battery box and the standby energy consumption of the battery box. The method for determining the energy efficiency index value of the battery box dimension includes: for any battery box, the charge and discharge energy conversion efficiency of the battery box is calculated based on the total discharge amount of the battery box and the total charge amount of the battery box during an evaluation period; for any battery box, the standby energy consumption of the battery box is calculated based on the standby energy consumption of the battery box and the total charge amount of the battery box during the evaluation period.

[0010] According to one embodiment of the present application, the energy efficiency index value of the energy storage device dimension includes the battery efficiency of the energy storage battery, the average conversion efficiency of the energy storage inverter, the average efficiency of the transformer, the DC side power line efficiency, the low-voltage AC side power line efficiency, the high-voltage AC side power line efficiency, and the power consumption of the auxiliary equipment of the inverter booster cabin. The method for determining the energy efficiency index value of the energy storage device dimension includes: for any energy storage battery, the battery efficiency of the energy storage battery is calculated based on the amount of electricity discharged from the energy storage battery body and the amount of electricity charged into the energy storage battery body during the evaluation period; for any energy storage inverter, the average conversion efficiency of the energy storage inverter is calculated based on the total energy output of the energy storage inverter and the total energy input of the energy storage inverter during the evaluation period; for any transformer, the output active power of the transformer and the iron loss of the transformer during the evaluation period are calculated. The average efficiency of the transformer is calculated based on the copper loss of the transformer and the DC loss of the transformer. For the DC power line, the efficiency of the DC power line is calculated based on the DC side rated current of the DC power line and the resistance of the DC cable within the evaluation period. For the low-voltage AC power line, the efficiency of the low-voltage AC power line is calculated based on the low-voltage AC side rated current of the low-voltage AC power line and the resistance of the low-voltage AC cable within the evaluation period. For the high-voltage AC power line, the efficiency of the high-voltage AC power line is calculated based on the high-voltage AC side rated current of the high-voltage AC power line and the resistance of the high-voltage AC cable within the evaluation period. For any energy storage unit, the auxiliary equipment power consumption of the inverter boost cabin corresponding to the energy storage unit is calculated based on the auxiliary equipment power consumption of the energy storage unit and the auxiliary equipment power consumption of the battery cabin within the evaluation period.

[0011] According to one embodiment of the present application, the performance of the energy storage power station is evaluated based on the energy efficiency index value, including: obtaining a multi-level alarm interval corresponding to each energy efficiency index value; for any energy efficiency index value, matching the energy efficiency index value with its corresponding multi-level alarm interval to obtain a target alarm interval corresponding to the energy efficiency index value, and issuing an alarm signal based on the alarm level corresponding to the target alarm interval.

[0012] According to an embodiment of the present application, the performance of an energy storage power station is evaluated based on energy efficiency index values, including: for any evaluation dimension, obtaining a time series sequence of index values ​​corresponding to the evaluation dimension in multiple evaluation cycles, and obtaining a pre-trained index value early warning model corresponding to the evaluation dimension; inputting the index value time series sequence into the index value early warning model to obtain an early warning result output by the index value early warning model.

[0013] The second aspect of the present application proposes a performance evaluation device for an energy storage power station, including: a collection module, used to collect performance-related parameters of the energy storage power station within an evaluation period; a calculation module, used to calculate the energy efficiency index values ​​corresponding to the energy storage power station in multiple evaluation dimensions according to the performance-related parameters, wherein the multiple evaluation dimensions include at least an energy storage power station dimension, a collection line dimension, an energy storage unit dimension, a battery cluster dimension, a battery plug-in box dimension and an energy storage device dimension; an evaluation module, used to perform performance evaluation on the energy storage power station according to the energy efficiency index value.

[0014] According to one embodiment of the present application, the energy efficiency index value of the energy storage power station dimension includes the comprehensive efficiency of the energy storage power station, the energy storage loss rate, the station power consumption rate and the transformer and distribution loss. The calculation module is also used to: calculate the comprehensive efficiency of the energy storage power station based on the online power of the energy storage power station and the offline power of the energy storage power station during the evaluation period; calculate the energy storage loss rate based on the sum of the charged amounts of all energy storage units included in the energy storage power station, the sum of the discharged amounts of all energy storage units included in the energy storage power station, and the offline power of the energy storage power station during the evaluation period; calculate the station power consumption rate based on the total station power consumption of the energy storage power station and the offline power of the energy storage power station during the evaluation period; calculate the transformer and distribution loss corresponding to the evaluation period based on the comprehensive efficiency of the energy storage power station, the energy storage loss rate and the station power consumption rate.

[0015] According to one embodiment of the present application, the energy efficiency index value of the collection circuit dimension includes the charge-discharge energy conversion efficiency of the collection circuit, and the calculation module is also used to: for any collection circuit, calculate the charge-discharge energy conversion efficiency of the collection circuit based on the total discharge amount of each energy storage unit connected to the collection circuit within the evaluation period and the total charge amount of each energy storage unit connected to the collection circuit.

[0016] According to one embodiment of the present application, the energy efficiency index value of the energy storage unit dimension includes the charge and discharge energy conversion efficiency of the energy storage unit. The calculation module is also used to: for any energy storage unit, calculate the charge and discharge energy conversion efficiency of the energy storage unit based on the total discharge amount of the energy storage unit and the total charge amount of the energy storage unit during the evaluation period.

[0017] According to one embodiment of the present application, the energy storage unit includes multiple battery stacks, the battery stack includes multiple battery clusters, the battery cluster is integrated with a first metering chip for collecting performance-related parameters of the battery cluster, the energy efficiency index value of the battery cluster dimension includes the charge and discharge energy conversion efficiency of the battery cluster and the standby energy consumption of the battery cluster, and the calculation module is also used to: for any battery cluster, calculate the charge and discharge energy conversion efficiency of the battery cluster based on the total discharge amount of the battery cluster and the total charge amount of the battery cluster during the evaluation period; for any battery cluster, calculate the standby energy consumption of the battery cluster based on the standby energy consumption of the battery cluster and the total charge amount of the battery cluster during the evaluation period.

[0018] According to an embodiment of the present application, a battery cluster includes multiple battery boxes, and a second metering chip for collecting performance-related parameters of the battery boxes is integrated on the battery boxes. The energy efficiency index value of the battery box dimension includes the charge and discharge energy conversion efficiency of the battery box and the standby energy consumption of the battery box. The calculation module is further used to: for any battery box, calculate the charge and discharge energy conversion efficiency of the battery box based on the total discharge amount of the battery box and the total charge amount of the battery box during an evaluation period; for any battery box, calculate the standby energy consumption of the battery box based on the standby energy consumption of the battery box and the total charge amount of the battery box during the evaluation period.

[0019] According to one embodiment of the present application, the energy efficiency index value of the energy storage device dimension includes the battery efficiency of the energy storage battery, the average conversion efficiency of the energy storage inverter, the average efficiency of the transformer, the DC side power line efficiency, the low-voltage AC side power line efficiency, the high-voltage AC side power line efficiency, and the power consumption of the auxiliary equipment of the inverter booster cabin. The calculation module is also used for: for any energy storage battery, the battery efficiency of the energy storage battery is calculated based on the amount of electricity discharged from the energy storage battery body and the amount of electricity charged into the energy storage battery body during the evaluation period; for any energy storage inverter, the average conversion efficiency of the energy storage inverter is calculated based on the total energy output of the energy storage inverter and the total energy input of the energy storage inverter during the evaluation period; for any transformer, the output active power of the transformer, the iron loss of the transformer, and the transformer's The average efficiency of the transformer is calculated based on the copper loss. For the DC power line, the efficiency of the DC power line is calculated based on the DC side rated current of the DC power line and the resistance of the DC cable during the evaluation period. For the low-voltage AC power line, the efficiency of the low-voltage AC power line is calculated based on the low-voltage AC side rated current of the low-voltage AC power line and the resistance of the low-voltage AC cable during the evaluation period. For the high-voltage AC power line, the efficiency of the high-voltage AC power line is calculated based on the high-voltage AC side rated current of the high-voltage AC power line and the resistance of the high-voltage AC cable during the evaluation period. For any energy storage unit, the auxiliary equipment power consumption of the inverter booster compartment corresponding to the energy storage unit is calculated based on the auxiliary equipment power consumption of the energy storage unit and the auxiliary equipment power consumption of the battery compartment during the evaluation period.

[0020] According to one embodiment of the present application, the evaluation module is also used to: obtain a multi-level alarm interval corresponding to each energy efficiency index value; for any energy efficiency index value, match the energy efficiency index value with its corresponding multi-level alarm interval to obtain a target alarm interval corresponding to the energy efficiency index value, and issue an alarm signal based on the alarm level corresponding to the target alarm interval.

[0021] According to one embodiment of the present application, the evaluation module is also used to: for any evaluation dimension, obtain the indicator value time series sequence corresponding to the evaluation dimension in multiple evaluation cycles, and obtain a pre-trained indicator value early warning model corresponding to the evaluation dimension; input the indicator value time series sequence into the indicator value early warning model to obtain the early warning result output by the indicator value early warning model.

[0022] The third aspect embodiment of the present application proposes an electronic device, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to implement the performance evaluation method of the energy storage power station as described in the first aspect embodiment of the present application.

[0023] The fourth aspect embodiment of the present application proposes a non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to implement the performance evaluation method of the energy storage power station as described in the first aspect embodiment of the present application.

[0024] The fifth aspect of the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the performance evaluation method of the energy storage power station as described in the first aspect of the present application.

[0025] The technical solution provided by the embodiments of the present disclosure brings at least the following beneficial effects: the present application provides a more fine-grained energy consumption analysis method, optimizes the precision of the energy consumption analysis of the energy storage power station, and improves the comprehensive efficiency, stability and refined management capabilities of the energy storage power station; through in-depth analysis of the working efficiency of energy storage containers of different dimensions and types within the energy storage power station, it is possible to capture and accurately identify in real time the problems and potential hidden dangers that may occur during the operation of the energy storage power station, which not only ensures that the energy storage power station can maintain a high-speed and stable operating state, but also improves the safety of the energy storage power station to a certain extent, effectively reduces potential risks, and provides technical guarantees for the long-term and reliable operation of the energy storage power station.

[0026] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0028] Figure 1 It is a schematic diagram of an exemplary implementation of a performance evaluation method for an energy storage power station shown in an embodiment of the present application.

[0029] Figure 2It is a structural diagram of an energy storage power station shown in one embodiment of the present application.

[0030] Figure 3 It is a schematic diagram of the internal structure of an energy storage unit shown in one embodiment of the present application.

[0031] Figure 4 It is a schematic diagram of the internal structure of a battery cluster shown in one embodiment of the present application.

[0032] Figure 5 It is a schematic diagram of an exemplary implementation of a performance evaluation method for an energy storage power station shown in an embodiment of the present application.

[0033] Figure 6 It is a schematic diagram of an exemplary implementation of a performance evaluation method for an energy storage power station shown in an embodiment of the present application.

[0034] Figure 7 It is an exemplary schematic diagram of a performance evaluation device for an energy storage power station shown in one embodiment of the present application.

[0035] Figure 8 It is a schematic diagram of an electronic device shown in one embodiment of the present application. DETAILED DESCRIPTION

[0036] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0037] It should be noted that the acquisition, transmission, storage, use, and processing of data in the technical solution of this application are in compliance with the relevant provisions of laws and regulations.

[0038] Figure 1 is a schematic diagram of an exemplary implementation of a performance evaluation method for an energy storage power station shown in the present application, such as Figure 1 As shown, the performance evaluation method of the energy storage power station includes the following steps:

[0039] S101, collecting performance-related parameters of the energy storage power station during an evaluation period.

[0040] Among them, depending on the purpose of the evaluation, the evaluation period can be a time unit such as day, week, month or year.

[0041] Through the monitoring and data acquisition system, all kinds of operating data of the energy storage power station during the evaluation period are comprehensively collected. The performance-related parameters collected include but are not limited to the following:

[0042] The overall operating data of the energy storage power station: such as total charge and discharge capacity, number of charge and discharge times, efficiency of energy storage and release, etc.

[0043] Collector line data: current, voltage, load status of the collector line inside the energy storage power station, and the charge and discharge capacity of all connected energy storage units.

[0044] Operation status of energy storage units: charging and discharging efficiency, temperature, health status, capacity, charging and discharging amount and other parameters of each energy storage unit.

[0045] Battery cluster and battery box data: parameters such as the charge and discharge capacity of the battery cluster and battery box.

[0046] Efficiency of energy storage devices: Energy storage devices may include batteries, inverters, transformers, etc., and parameters such as the working efficiency and load conditions of each device need to be collected.

[0047] S102, calculating energy efficiency index values ​​corresponding to the energy storage power station in multiple evaluation dimensions according to the performance-related parameters, wherein the multiple evaluation dimensions include at least the energy storage power station dimension, the collection line dimension, the energy storage unit dimension, the battery cluster dimension, the battery plug-in box dimension and the energy storage device dimension.

[0048] In some embodiments, the energy efficiency index value of the energy storage power station dimension includes at least the comprehensive efficiency of the energy storage power station, the energy storage loss rate, the station power consumption rate, and the transformer and distribution loss.

[0049] In some embodiments, the energy efficiency index value of the collector circuit dimension includes at least the charge-discharge energy conversion efficiency of the collector circuit.

[0050] In some embodiments, the energy efficiency index value of the energy storage unit dimension includes at least the charge-discharge energy conversion efficiency of the energy storage unit.

[0051] In some embodiments, the energy efficiency index value of the battery cluster dimension includes at least the charge-discharge energy conversion efficiency of the battery cluster and the standby energy consumption of the battery cluster.

[0052] In some embodiments, the energy efficiency index value of the battery box dimension includes at least the charge-discharge energy conversion efficiency of the battery box and the standby energy consumption of the battery box.

[0053] In some embodiments, the energy efficiency index value of the energy storage device dimension includes at least the battery efficiency of the energy storage battery, the average conversion efficiency of the energy storage inverter, the average efficiency of the transformer, the DC side power line efficiency, the low-voltage AC side power line efficiency, the high-voltage AC side power line efficiency, and the power consumption of auxiliary equipment of the inverter boost cabin.

[0054] S103, evaluating the performance of the energy storage power station according to the energy efficiency index value.

[0055] In some embodiments, according to the importance of different evaluation dimensions, a weight is assigned to the energy efficiency index of each dimension (if there are multiple indicators under one evaluation dimension, the sum of the weights of all indicators under the evaluation dimension is equal to the weight of the evaluation dimension). For example, the energy storage power station dimension may be more important, so a higher weight can be assigned. Then, the energy efficiency index values ​​of each dimension are weighted averaged to obtain the comprehensive energy efficiency evaluation result of the energy storage power station.

[0056] In some implementations, energy efficiency index thresholds are set for each evaluation dimension to evaluate whether the performance of the energy storage power station in different dimensions meets expectations.

[0057] The embodiment of the present application proposes a performance evaluation method for an energy storage power station, including: collecting performance-related parameters of the energy storage power station within the evaluation period; calculating the energy efficiency index values ​​corresponding to the energy storage power station in multiple evaluation dimensions according to the performance-related parameters, wherein the multiple evaluation dimensions at least include the energy storage power station dimension, the collector line dimension, the energy storage unit dimension, the battery cluster dimension, the battery plug-in box dimension and the energy storage device dimension; and evaluating the performance of the energy storage power station according to the energy efficiency index value. The present application provides a more granular energy consumption analysis method, which optimizes the precision of the energy consumption analysis of the energy storage power station, improves the comprehensive efficiency, stability and refined management capabilities of the energy storage power station; by deeply analyzing the working efficiency of energy storage containers of different dimensions and different types within the energy storage power station, it can capture and accurately identify problems and potential hidden dangers that may occur in the operation of the energy storage power station in real time, which not only ensures that the energy storage power station can maintain a high-speed and stable operating state, but also improves the safety of the energy storage power station to a certain extent, effectively reduces potential risks, and provides technical guarantees for the long-term and reliable operation of the energy storage power station.

[0058] Next, we will introduce in detail the calculation process of the energy efficiency index values ​​corresponding to multiple evaluation dimensions of the energy storage power station:

[0059] 1. Energy storage power station dimensions

[0060] The energy efficiency index values ​​of the energy storage power station dimension include the comprehensive efficiency of the energy storage power station, the energy storage loss rate, the station power consumption rate, and the transformer and distribution loss. The determination methods of the above four energy efficiency index values ​​of the energy storage power station dimension are introduced in turn as follows:

[0061] (1) The comprehensive efficiency of the energy storage power station is calculated based on the on-grid power and off-grid power of the energy storage power station during the evaluation period. The calculation formula is as follows:

[0062]

[0063] In the above formula:

[0064] η EESSIt represents the comprehensive efficiency of the energy storage power station during the evaluation period, in %;

[0065] E on It represents the amount of electricity that the energy storage power station consumes during the evaluation period, in kilowatt-hours (kW·h);

[0066] E off It indicates the amount of electricity that the energy storage power station generates during the evaluation period, in kilowatt-hours (kW·h).

[0067] (2) The energy storage loss rate is calculated based on the total charge amount of all energy storage units contained in the energy storage power station, the total discharge amount of all energy storage units contained in the energy storage power station, and the off-grid power of the energy storage power station during the evaluation period; the calculation formula is as follows:

[0068]

[0069] In the above formula:

[0070] R ES Indicates the energy storage loss rate of the energy storage power station during the evaluation period, in %;

[0071] ∑E C It represents the total charge capacity of all energy storage units contained in the energy storage power station during the evaluation period, in kilowatt-hours (kW·h);

[0072] ∑E D It represents the total discharge of all energy storage units contained in the energy storage power station during the evaluation period, in kilowatt-hours (kW·h);

[0073] E off It indicates the amount of electricity that the energy storage power station generates during the evaluation period, in kilowatt-hours (kW·h).

[0074] (3) The power consumption rate of the energy storage power station is calculated based on the total power consumption of the energy storage power station and the power consumption of the energy storage power station during the evaluation period. The calculation formula is as follows:

[0075]

[0076] In the above formula:

[0077] R S Indicates the power consumption rate of the energy storage power station during the evaluation period, in %;

[0078] ∑E S It represents the total power consumption of the energy storage power station during the evaluation period, in kilowatt-hours (kW·h);

[0079] E off It indicates the amount of electricity that the energy storage power station generates during the evaluation period, in kilowatt-hours (kW·h).

[0080] (4) Based on the comprehensive efficiency of the energy storage power station, the energy storage loss rate and the power consumption rate of the station, the corresponding distribution loss of the energy storage power station during the evaluation period is calculated. The calculation formula is as follows:

[0081] R i =1-η EESS -R ES -R S

[0082] In the above formula, R i It indicates the loss rate of power distribution of energy storage power station during the evaluation period, in %.

[0083] R S Indicates the power consumption rate of the energy storage power station during the evaluation period, in %;

[0084] η EESS It represents the comprehensive efficiency of the energy storage power station during the evaluation period, in %.

[0085] R ES It indicates the energy storage loss rate of the energy storage power station during the evaluation period, in %.

[0086] Furthermore, the power distribution loss corresponding to the energy storage power station during the evaluation period can also be calculated based on the following formula:

[0087]

[0088] In the above formula, R i It indicates the loss rate of power distribution of energy storage power station during the evaluation period, in %.

[0089] E off It represents the amount of electricity that the energy storage power station generates during the evaluation period, in kilowatt-hours (kW·h);

[0090] ∑E S It represents the total power consumption of the energy storage power station during the evaluation period, in kilowatt-hours (kW·h);

[0091] ∑E C It represents the total charge capacity of all energy storage units contained in the energy storage power station during the evaluation period, in kilowatt-hours (kW·h);

[0092] ∑E D It represents the total discharge of all energy storage units contained in the energy storage power station during the evaluation period, in kilowatt-hours (kW·h);

[0093] E on It indicates the amount of electricity that the energy storage power station has connected to the grid during the evaluation period, in kilowatt-hours (kW·h).

[0094] 2. Dimensions of the collector line

[0095] Figure 2 This is a structural diagram of an energy storage power station shown in this application, such as Figure 2 As shown, the energy storage power station includes multiple collector lines, each collector line includes multiple energy storage units. In the present application, the energy efficiency index value of the collector line dimension includes the charge-discharge energy conversion efficiency of the collector line. The method for determining the energy efficiency index value of the collector line dimension includes: for any collector line, based on the sum of the discharge amounts of each energy storage unit connected to the collector line during the evaluation period and the sum of the charge amounts of each energy storage unit connected to the collector line, the charge-discharge energy conversion efficiency of the collector line is calculated, and the calculation formula is as follows:

[0096]

[0097] In the above formula:

[0098] η ESC It indicates the charge-discharge energy conversion efficiency of a certain collector line during the evaluation period, in %.

[0099] ∑E D1 It represents the total discharge amount of each energy storage unit connected to a certain collector circuit during the evaluation period, in kilowatt-hours (kW·h);

[0100] ∑E C1 It represents the total charge of each energy storage unit connected to a certain collector circuit during the evaluation period, in kilowatt-hours (kW·h).

[0101] 3. Energy storage unit dimension

[0102] In the present application, the energy efficiency index value of the energy storage unit dimension includes the charge-discharge energy conversion efficiency of the energy storage unit. The method for determining the energy efficiency index value of the energy storage unit dimension includes: for any energy storage unit, the charge-discharge energy conversion efficiency of the energy storage unit is calculated based on the total discharge amount of the energy storage unit and the total charge amount of the energy storage unit during the evaluation period, and the calculation formula is as follows:

[0103]

[0104] In the above formula:

[0105] η ESU It indicates the charge-discharge energy conversion efficiency of a certain energy storage unit during the evaluation period, in %;

[0106] E D2 It represents the total discharge amount of a certain energy storage unit during the evaluation period, in kilowatt-hours (kW·h);

[0107] E C2 It represents the total charge amount of a certain energy storage unit during the evaluation period, in kilowatt-hours (kW·h).

[0108] 4. Battery Cluster Dimension

[0109] Figure 3 is a schematic diagram of the internal structure of an energy storage unit shown in this application, such as Figure 3 As shown, the energy storage unit includes multiple battery stacks, the battery stack includes multiple battery clusters, and the second level of the battery management system (BMS) on the battery cluster is integrated with a first metering chip for collecting performance-related parameters of the battery cluster. The first metering chip collects the total discharge amount of the battery cluster, the total charge amount of the battery cluster and the standby energy consumption of the battery cluster.

[0110] In this application, the energy efficiency index value of the battery cluster dimension includes the charge and discharge energy conversion efficiency of the battery cluster and the standby energy consumption of the battery cluster. The method for determining the energy efficiency index value of the battery cluster dimension will be introduced in turn as follows:

[0111] (1) For any battery cluster, the charge-discharge energy conversion efficiency of the battery cluster is calculated based on the total discharge amount of the battery cluster and the total charge amount of the battery cluster during the evaluation period. The calculation formula is as follows:

[0112]

[0113] In the above formula:

[0114] η ESCC It indicates the charge and discharge energy conversion efficiency of a battery cluster during the evaluation period, in %.

[0115] E D3 It represents the total discharge amount of a battery cluster during the evaluation period, in kilowatt-hours (kW·h);

[0116] E C3 It indicates the total charge amount of a battery cluster during the evaluation period, in kilowatt-hours (kW·h).

[0117] (2) For any battery cluster, the standby energy consumption of the battery cluster is calculated based on the standby energy consumption of the battery cluster and the total charge amount of the battery cluster during the evaluation period. The calculation formula is as follows:

[0118]

[0119] In the above formula:

[0120] η SPCC Indicates the standby energy consumption of a battery cluster during the evaluation period, in %;

[0121] E SEC It represents the standby energy consumption of a battery cluster during the evaluation period, in kilowatt-hours (kW·h);

[0122] E C3 It indicates the total charge amount of a battery cluster during the evaluation period, in kilowatt-hours (kW·h).

[0123] 5. Battery box dimensions

[0124] Figure 4 is a schematic diagram of the internal structure of a battery cluster shown in this application, such as Figure 4 As shown, the battery cluster includes multiple battery boxes, and the battery boxes are integrated with a second metering chip for collecting performance-related parameters of the battery boxes in the third level of the BMS. The second metering chip collects the total discharge amount of the battery boxes, the total charge amount of the battery boxes, and the standby energy consumption of the battery boxes.

[0125] In this application, the energy efficiency index value of the battery plug box dimension includes the charge and discharge energy conversion efficiency of the battery plug box and the standby energy consumption of the battery plug box. The method for determining the energy efficiency index value of the battery plug box dimension will be introduced in turn as follows:

[0126] (1) For any battery box, the charge-discharge energy conversion efficiency of the battery box is calculated based on the total discharge capacity and the total charge capacity of the battery box during the evaluation period. The calculation formula is as follows:

[0127]

[0128] In the above formula:

[0129] η ESCB Indicates the charging and discharging energy efficiency of a battery box during the evaluation period, in %;

[0130] E D4 It indicates the total discharge capacity of a battery box during the evaluation period, in kilowatt-hours (kW·h);

[0131] E C4 It indicates the total charge capacity of a battery box during the evaluation period, in kilowatt-hours (kW·h).

[0132] (2) For any battery box, the standby energy consumption of the battery box is calculated based on the standby energy consumption of the battery box and the total charge amount of the battery box during the evaluation period. The calculation formula is as follows:

[0133]

[0134] In the above formula:

[0135] η SPCB Indicates the standby energy consumption of a battery box during the evaluation period, in %.

[0136] E SEB Indicates the standby energy consumption of a battery box during the evaluation period, in kilowatt-hours (kW·h);

[0137] E C4 It indicates the total charge capacity of a battery box during the evaluation period, in kilowatt-hours (kW·h).

[0138] 6. Energy storage device dimension

[0139] Energy storage power stations are mainly composed of energy storage equipment and other necessary electrical primary and secondary equipment, auxiliary equipment, etc. Energy storage power stations will consume energy during operation, and the energy consumption mainly consists of two aspects: the loss of the energy storage system itself and the loss of auxiliary equipment operation.

[0140] The first aspect is to introduce the loss of the energy storage system itself. When the energy storage system is in a charging or discharging state, in the main circuit of the energy storage power station, the battery system, energy storage converter, transformer, DC cable, low-voltage AC cable, high-voltage AC cable and other equipment will generate energy loss.

[0141] In this application, the energy efficiency index value of the energy storage device dimension includes the battery efficiency of the energy storage battery, the average conversion efficiency of the energy storage converter, the average efficiency of the transformer, the DC side power line efficiency, the low voltage AC side power line efficiency, the high voltage AC side power line efficiency, the auxiliary equipment power consumption of the inverter booster cabin, and the method for determining the energy efficiency index value of the energy storage device dimension, which will be introduced in turn as follows:

[0142] (1) The internal resistance of the energy storage battery will generate energy loss during the discharge and charging process. Battery efficiency refers to the efficiency of the energy storage battery in completing the charge and discharge cycle. In this application, for any energy storage battery, the battery efficiency of the energy storage battery is calculated based on the amount of electricity discharged from the energy storage battery and the amount of electricity charged into the energy storage battery during the evaluation period; the calculation formula is as follows:

[0143]

[0144] In the above formula:

[0145] η B Indicates the battery efficiency of a certain energy storage battery during the evaluation period, in %;

[0146] E BD It indicates the amount of electricity discharged by a certain energy storage battery during the evaluation period, in kilowatt-hours (kW·h);

[0147] E BC It indicates the amount of electricity charged into a certain energy storage battery during the evaluation period, in kilowatt-hours (kW·h).

[0148] (2) For energy storage converters, different DC side voltages, charge and discharge states, battery quality, temperature, etc. will affect their conversion efficiency during operation. Therefore, in actual calculations, the average efficiency of the energy storage converter is usually taken as a reference. In this application, for any energy storage converter, the average conversion efficiency of the energy storage converter is calculated based on the total energy output of the energy storage converter and the total energy input of the energy storage converter during the evaluation period; the calculation formula is as follows:

[0149]

[0150] In the above formula:

[0151] η PCS It represents the average conversion efficiency of a certain energy storage converter during the evaluation period, in %;

[0152] E o It represents the total energy output by a certain energy storage converter during the evaluation period, in kilowatt-hours (kW·h);

[0153] E i It represents the total energy input to a certain energy storage converter during the evaluation period, in kilowatt-hours (kW·h).

[0154] (3) For the transformer, during normal operation, the transformer will generate losses, and the main losses are divided into two parts: copper loss and iron loss. Under normal circumstances, the iron loss of the transformer is a constant, which has nothing to do with the size of the load, so the iron loss is a constant loss; while the copper loss is related to the size of the load and is proportional to the square of the load current, so the copper loss is a variable loss. In this application, for any transformer, the average efficiency of the transformer is calculated based on the output active power of the transformer, the iron loss of the transformer, and the copper loss of the transformer during the evaluation period. The calculation formula is as follows:

[0155]

[0156] In the above formula:

[0157] η T It represents the average transformer efficiency of a transformer during the evaluation period, in %.

[0158] P o It represents the output active power of a transformer during the evaluation period, in kilowatt-hours (kW·h);

[0159] E Fe It represents the iron loss of a transformer during the evaluation period, in kilowatt-hours (kW·h);

[0160] E Cu It represents the copper loss of a transformer during the evaluation period, in kilowatt-hour (kW·h).

[0161] (4) For the DC side power line, during normal operation, the efficiency of the DC side unidirectional power line is determined by the DC side rated current and the resistance of the DC cable, and the resistance of the DC cable mainly depends on parameters such as the DC cable diameter and cable length. The efficiency of the DC side power line is the square of the DC side unidirectional power efficiency. In this application, for the DC side power line, the efficiency of the DC side power line is calculated based on the DC side rated current of the DC side power line and the resistance of the DC cable during the evaluation period, and the calculation formula is as follows:

[0162]

[0163] In the above formula:

[0164] P DC It represents the efficiency of the DC power line during the evaluation period, in kilowatt-hour (kW·h);

[0165] I DC Indicates the rated current of the DC side during the evaluation period, in ampere (A);

[0166] R DC Indicates the resistance of the DC cable during the evaluation period in ohms (Ω).

[0167] (5) For the low-voltage AC side power line, during normal operation, the efficiency of the low-voltage AC side unidirectional power line is determined by the low-voltage AC side rated current and the resistance of the AC cable, and the resistance of the AC cable mainly depends on parameters such as the AC cable diameter and cable length. The efficiency of the low-voltage AC side power line is the square of the efficiency of the low-voltage AC side unidirectional power line. In this application, for the low-voltage AC side power line, the efficiency of the low-voltage AC side power line is calculated based on the low-voltage AC side rated current and the resistance of the low-voltage AC cable of the low-voltage AC side power line during the evaluation period, and the calculation formula is as follows:

[0168]

[0169] In the above formula:

[0170] P LAC It represents the efficiency of the low-voltage AC power line during the evaluation period, in kilowatt-hour (kW·h);

[0171] I LAC Indicates the rated current of the low voltage AC side during the evaluation period, in ampere (A);

[0172] R lAC Indicates the resistance of the low-voltage AC cable during the evaluation period, in ohms (Ω).

[0173] (6) For the high-voltage AC power line, during normal operation, the efficiency of the high-voltage AC unidirectional power line is determined by the rated current of the high-voltage AC side and the resistance of the AC cable, and the resistance of the AC cable mainly depends on parameters such as the AC cable diameter and cable length. The efficiency of the high-voltage AC power line is the square of the efficiency of the high-voltage AC unidirectional power line. For the high-voltage AC power line, the efficiency of the high-voltage AC power line is calculated based on the rated current of the high-voltage AC side of the high-voltage AC power line and the resistance of the high-voltage AC cable during the evaluation period. The calculation formula is as follows:

[0174]

[0175] In the above formula:

[0176] P HAC It represents the efficiency of the high-voltage AC power line during the evaluation period, in kilowatt-hour (kW·h);

[0177] I HAC Indicates the rated current of the high voltage AC side during the evaluation period, in ampere (A);

[0178] R HAC Indicates the resistance of the high-voltage AC cable during the evaluation period, in ohms (Ω).

[0179] The second aspect below introduces the losses caused by the operation of auxiliary equipment. In the energy storage system, the auxiliary equipment in each energy storage unit is mainly composed of the battery compartment and the auxiliary equipment of the inverter and booster compartment. The present application proposes a metering method for the energy storage unit. By using a multi-function meter in the inverter and booster compartment for direct acquisition, the power consumption of the auxiliary equipment of the energy storage unit can be obtained; the present application proposes a metering method for the battery compartment. By using a multi-function meter in the battery compartment for direct acquisition, the power consumption of the auxiliary equipment of the battery compartment can be obtained.

[0180] (7) For any energy storage unit, the auxiliary equipment power consumption of the inverter booster compartment corresponding to the energy storage unit is calculated based on the auxiliary equipment power consumption of the energy storage unit and the auxiliary equipment power consumption of the battery compartment during the evaluation period. The calculation formula is as follows:

[0181] E APCS =E AU -E AC

[0182] In the above formula:

[0183] E APCS It represents the power consumption of auxiliary equipment of the inverter booster cabin during the evaluation period, in kilowatt-hours (kW·h);

[0184] E AU Indicates the power consumption of auxiliary equipment of the energy storage unit during the evaluation period, in kilowatt-hours (kW·h);

[0185] E AC It indicates the power consumption of auxiliary equipment in the battery compartment during the evaluation period, in kilowatt-hours (kW·h).

[0186] Figure 5 is a schematic diagram of an exemplary implementation of a performance evaluation method for an energy storage power station shown in the present application, such as Figure 5 As shown, the performance evaluation method of the energy storage power station includes the following steps:

[0187] S501, collecting performance-related parameters of the energy storage power station during an evaluation period.

[0188] S502, calculating energy efficiency index values ​​corresponding to the energy storage power station in multiple evaluation dimensions according to the performance-related parameters, wherein the multiple evaluation dimensions include at least the energy storage power station dimension, the collector line dimension, the energy storage unit dimension, the battery cluster dimension, the battery plug-in box dimension and the energy storage device dimension.

[0189] Regarding the specific implementation of steps S501 to S502, reference may be made to the specific introduction of the relevant parts in the above embodiments, which will not be elaborated here.

[0190] S503: Obtain a multi-level warning interval corresponding to each energy efficiency index value.

[0191] Among them, each energy efficiency index value corresponds to a multi-level alarm interval. For example, the comprehensive efficiency of the energy storage power station can correspond to three alarm intervals, corresponding to the first-level alarm, the second-level alarm, and the third-level alarm. The smaller the alarm level, the more serious the fault.

[0192] S504, for any energy efficiency index value, matching the energy efficiency index value with its corresponding multi-level alarm interval to obtain a target alarm interval corresponding to the energy efficiency index value, and issuing an alarm signal based on the alarm level corresponding to the target alarm interval.

[0193] For example, the operator may be prompted with the alarm status of the indicator through a control panel or a display screen on the device.

[0194] For example, the management personnel or maintenance personnel may be notified via SMS, email, APP push, etc.

[0195] The embodiments of the present application can help power plants operate more efficiently by improving the monitoring and alarm mechanisms of energy efficiency indicators. By setting multi-level alarm intervals, it can ensure that problems can be discovered and measures can be taken in a timely manner when they occur. Managers can prioritize the most urgent situations according to the alarm level.

[0196] Figure 6 is a schematic diagram of an exemplary implementation of a performance evaluation method for an energy storage power station shown in the present application, such as Figure 6As shown, the performance evaluation method of the energy storage power station includes the following steps:

[0197] S601, collecting performance-related parameters of the energy storage power station during an evaluation period.

[0198] S602, calculating the energy efficiency index values ​​corresponding to the energy storage power station in multiple evaluation dimensions according to the performance-related parameters, wherein the multiple evaluation dimensions include at least the energy storage power station dimension, the collector line dimension, the energy storage unit dimension, the battery cluster dimension, the battery plug-in box dimension and the energy storage device dimension.

[0199] Regarding the specific implementation of steps S601 to S602, reference may be made to the specific introduction of the relevant parts in the above embodiments, which will not be elaborated here.

[0200] S603, for any evaluation dimension, obtain the time series sequence of indicator values ​​corresponding to the evaluation dimension in multiple evaluation cycles, and obtain a pre-trained indicator value warning model corresponding to the evaluation dimension.

[0201] For example, taking the energy storage power station dimension as an example, if the evaluation cycle is daily, in order to conduct more accurate monitoring and early warning, the indicator value of the energy storage power station dimension can be obtained by window sliding. That is, the indicator data is obtained from a fixed time window (such as the past 7 days) and analyzed within this window. When the sliding window slides forward, new time series data can be obtained. This method can dynamically track the changing trend of the evaluation dimension.

[0202] In order to promptly detect potential problems during daily operation, an early warning model can be built for each evaluation dimension. This model is trained based on historical data (such as data related to energy storage power station dimensions over a period of time in the past) and can be built based on machine learning algorithms (such as regression analysis, time series analysis, neural networks, etc.).

[0203] S604, inputting the indicator value time series sequence into the indicator value early warning model to obtain the early warning result output by the indicator value early warning model.

[0204] The early warning model analyzes trends and fluctuation patterns through the time series of indicator values, predicts future changes based on historical performance, and evaluates whether there is a possibility of abnormal behavior. For example, whether the charging and discharging energy conversion efficiency of the energy storage unit has declined in the past few days, and whether this decline is consistent with the pattern of historical failures.

[0205] Based on the warning results output by the indicator value warning model, the system will send a warning notification to the operation and maintenance personnel or management personnel to remind them to pay attention to the status of the power station. If it is a serious warning, it may automatically trigger the remote control system to make adjustments, or dispatch the operation and maintenance personnel to conduct on-site inspections.

[0206] The embodiment of the present application helps managers to timely understand the health status of the power plant by obtaining the time series sequence of historical data of the evaluation dimension and combining it with the pre-trained indicator value warning model, and take corresponding measures according to the warning level to ensure the safe and stable operation of the power plant.

[0207] Figure 7 is an exemplary schematic diagram of a performance evaluation device for an energy storage power station shown in the present application, such as Figure 7 As shown, the performance evaluation device 700 of the energy storage power station includes a collection module 701, a calculation module 702 and an evaluation module 703, wherein:

[0208] The collection module 701 is used to collect performance-related parameters of the energy storage power station during the evaluation period.

[0209] The calculation module 702 is used to calculate the energy efficiency index values ​​corresponding to the energy storage power station in multiple evaluation dimensions according to the performance-related parameters, wherein the multiple evaluation dimensions at least include the energy storage power station dimension, the collection line dimension, the energy storage unit dimension, the battery cluster dimension, the battery plug box dimension and the energy storage device dimension.

[0210] The evaluation module 703 is used to evaluate the performance of the energy storage power station according to the energy efficiency index value.

[0211] This device provides a more fine-grained energy consumption analysis method, optimizes the precision of the energy consumption analysis of the energy storage power station, and improves the comprehensive efficiency, stability and refined management capabilities of the energy storage power station; through in-depth analysis of the working efficiency of energy storage containers of different dimensions and types within the energy storage power station, it can capture and accurately identify in real time the problems and potential hidden dangers that may occur during the operation of the energy storage power station, which not only ensures that the energy storage power station can maintain a high-speed and stable operation state, but also improves the safety of the energy storage power station to a certain extent, effectively reduces potential risks, and provides technical guarantees for the long-term and reliable operation of the energy storage power station.

[0212] Furthermore, the energy efficiency index values ​​of the energy storage power station dimension include the comprehensive efficiency of the energy storage power station, the energy storage loss rate, the station power consumption rate and the transformer and distribution power loss. The calculation module 702 is also used to: calculate the comprehensive efficiency of the energy storage power station based on the online power of the energy storage power station and the offline power of the energy storage power station during the evaluation period; calculate the energy storage loss rate based on the total charge amount of all energy storage units included in the energy storage power station, the total discharge amount of all energy storage units included in the energy storage power station, and the offline power of the energy storage power station during the evaluation period; calculate the station power consumption rate based on the total station power consumption of the energy storage power station and the offline power of the energy storage power station during the evaluation period; calculate the transformer and distribution power loss corresponding to the evaluation period based on the comprehensive efficiency of the energy storage power station, the energy storage loss rate and the station power consumption rate.

[0213] Furthermore, the energy efficiency index value of the collector circuit dimension includes the charge-discharge energy conversion efficiency of the collector circuit. The calculation module 702 is also used to: for any collector circuit, calculate the charge-discharge energy conversion efficiency of the collector circuit based on the total discharge amount of each energy storage unit connected to the collector circuit within the evaluation period and the total charge amount of each energy storage unit connected to the collector circuit.

[0214] Furthermore, the energy efficiency index value of the energy storage unit dimension includes the charge-discharge energy conversion efficiency of the energy storage unit. The calculation module 702 is also used to: for any energy storage unit, calculate the charge-discharge energy conversion efficiency of the energy storage unit based on the total discharge amount of the energy storage unit and the total charge amount of the energy storage unit during the evaluation period.

[0215] Furthermore, the energy storage unit includes a plurality of battery stacks, the battery stack includes a plurality of battery clusters, the battery cluster is integrated with a first metering chip for collecting performance-related parameters of the battery cluster, the energy efficiency index value of the battery cluster dimension includes the charge and discharge energy conversion efficiency of the battery cluster and the standby energy consumption of the battery cluster, and the calculation module 702 is further used for: for any battery cluster, calculating the charge and discharge energy conversion efficiency of the battery cluster based on the total discharge amount of the battery cluster and the total charge amount of the battery cluster during the evaluation period; for any battery cluster, calculating the standby energy consumption of the battery cluster based on the standby energy consumption of the battery cluster and the total charge amount of the battery cluster during the evaluation period.

[0216] Furthermore, the battery cluster includes a plurality of battery boxes, and the battery boxes are integrated with a second metering chip for collecting performance-related parameters of the battery boxes. The energy efficiency index value of the battery box dimension includes the charge-discharge energy conversion efficiency of the battery box and the standby energy consumption of the battery box. The calculation module 702 is further used to: for any battery box, calculate the charge-discharge energy conversion efficiency of the battery box based on the total discharge amount of the battery box and the total charge amount of the battery box during an evaluation period; for any battery box, calculate the standby energy consumption of the battery box based on the standby energy consumption of the battery box and the total charge amount of the battery box during the evaluation period.

[0217] Furthermore, the energy efficiency index values ​​of the energy storage device dimension include the battery efficiency of the energy storage battery, the average conversion efficiency of the energy storage inverter, the average efficiency of the transformer, the DC side power line efficiency, the low-voltage AC side power line efficiency, the high-voltage AC side power line efficiency, and the power consumption of the auxiliary equipment of the inverter booster cabin. The calculation module 702 is also used to: for any energy storage battery, the battery efficiency of the energy storage battery is calculated based on the amount of electricity discharged from the energy storage battery body and the amount of electricity charged into the energy storage battery body during the evaluation period; for any energy storage inverter, the average conversion efficiency of the energy storage inverter is calculated based on the total energy output of the energy storage inverter and the total energy input of the energy storage inverter during the evaluation period; for any transformer, the output active power of the transformer, the iron loss of the transformer, and the copper loss of the transformer during the evaluation period are calculated. The average efficiency of the transformer is calculated based on the power consumption; for the DC side power line, the efficiency of the DC side power line is calculated based on the DC side rated current of the DC side power line and the resistance of the DC cable within the evaluation period; for the low-voltage AC side power line, the efficiency of the low-voltage AC side power line is calculated based on the low-voltage AC side rated current of the low-voltage AC side power line and the resistance of the low-voltage AC cable within the evaluation period; for the high-voltage AC side power line, the efficiency of the high-voltage AC side power line is calculated based on the high-voltage AC side rated current of the high-voltage AC side power line and the resistance of the high-voltage AC cable within the evaluation period; for any energy storage unit, the auxiliary equipment power consumption of the inverter boost cabin corresponding to the energy storage unit is calculated based on the auxiliary equipment power consumption of the energy storage unit and the auxiliary equipment power consumption of the battery cabin within the evaluation period.

[0218] Furthermore, the evaluation module 703 is also used to: obtain a multi-level alarm interval corresponding to each energy efficiency index value; for any energy efficiency index value, match the energy efficiency index value with its corresponding multi-level alarm interval to obtain a target alarm interval corresponding to the energy efficiency index value, and issue an alarm signal based on the alarm level corresponding to the target alarm interval.

[0219] Furthermore, the evaluation module 703 is also used to: for any evaluation dimension, obtain the indicator value time series sequence corresponding to the evaluation dimension in multiple evaluation cycles, and obtain a pre-trained indicator value warning model corresponding to the evaluation dimension; input the indicator value time series sequence into the indicator value warning model to obtain the warning result output by the indicator value warning model.

[0220] In order to implement the above embodiment, the present application embodiment also proposes an electronic device 800, such as Figure 8 As shown, the electronic device 800 includes: a processor 801 and a memory 802 that is communicatively connected to the processor, the memory 802 stores instructions that can be executed by at least one processor, and the instructions are executed by at least one processor 801 to implement the performance evaluation method of the energy storage power station shown in the above embodiment.

[0221] In order to implement the above embodiment, the embodiment of the present application also proposes a non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to enable a computer to implement the performance evaluation method of the energy storage power station shown in the above embodiment.

[0222] In order to implement the above embodiments, the embodiments of the present application also provide a computer program product, including a computer program, which, when executed by a processor, implements the performance evaluation method of the energy storage power station shown in the above embodiments.

[0223] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0224] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0225] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0226] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A performance evaluation method for an energy storage power station, characterized in that: include: Collect performance-related parameters of the energy storage power station during the evaluation period; According to the performance-related parameters, the energy efficiency index values ​​corresponding to the energy storage power station in multiple evaluation dimensions are calculated, wherein the multiple evaluation dimensions include at least the energy storage power station dimension, the collector line dimension, the energy storage unit dimension, the battery cluster dimension, the battery box dimension and the energy storage device dimension; A performance evaluation of the energy storage power station is performed according to the energy efficiency index value.

2. The method according to claim 1, characterized in that: The energy efficiency index value of the energy storage power station dimension includes the comprehensive efficiency of the energy storage power station, the energy storage loss rate, the station power consumption rate and the transformer and distribution loss. The method for determining the energy efficiency index value of the energy storage power station dimension includes: The comprehensive efficiency of the energy storage power station is calculated based on the online power generation of the energy storage power station and the offline power generation of the energy storage power station during the evaluation period; The energy storage loss rate is calculated based on the total charge amount of all energy storage units included in the energy storage power station, the total discharge amount of all energy storage units included in the energy storage power station, and the off-grid power of the energy storage power station during the evaluation period; The station power consumption rate is calculated based on the total power consumption of the energy storage power station and the off-grid power consumption of the energy storage power station during the evaluation period; The transformer and distribution loss corresponding to the evaluation period is calculated based on the comprehensive efficiency of the energy storage power station, the energy storage loss rate and the station power consumption rate.

3. The method according to claim 2, characterized in that The energy efficiency index value of the collector circuit dimension includes the charge-discharge energy conversion efficiency of the collector circuit. The method for determining the energy efficiency index value of the collector circuit dimension includes: For any collector circuit, the charge-discharge energy conversion efficiency of the collector circuit is calculated based on the total discharge amount of each energy storage unit connected to the collector circuit and the total charge amount of each energy storage unit connected to the collector circuit within an evaluation period.

4. The method according to claim 3, characterized in that The energy efficiency index value of the energy storage unit dimension includes the charge-discharge energy conversion efficiency of the energy storage unit. The method for determining the energy efficiency index value of the energy storage unit dimension includes: For any energy storage unit, the charge-discharge energy conversion efficiency of the energy storage unit is calculated based on the total discharge amount of the energy storage unit and the total charge amount of the energy storage unit within an evaluation period.

5. The method according to claim 4, characterized in that The energy storage unit includes a plurality of battery stacks, the battery stack includes a plurality of battery clusters, the battery cluster is integrated with a first metering chip for collecting performance-related parameters of the battery cluster, the energy efficiency index value of the battery cluster dimension includes the charge and discharge energy conversion efficiency of the battery cluster and the standby energy consumption of the battery cluster, and the method for determining the energy efficiency index value of the battery cluster dimension includes: For any battery cluster, the charge-discharge energy conversion efficiency of the battery cluster is calculated based on the total discharge amount of the battery cluster and the total charge amount of the battery cluster within an evaluation period; For any battery cluster, the standby energy consumption of the battery cluster is calculated based on the standby energy consumption of the battery cluster and the total charge amount of the battery cluster within an evaluation period.

6. The method according to claim 5, characterized in that The battery cluster includes a plurality of battery boxes, and the battery boxes are integrated with a second metering chip for collecting performance-related parameters of the battery boxes. The energy efficiency index value of the battery box dimension includes the charge and discharge energy conversion efficiency of the battery box and the standby energy consumption of the battery box. The method for determining the energy efficiency index value of the battery box dimension includes: For any battery box, the charge-discharge energy conversion efficiency of the battery box is calculated based on the total discharge amount of the battery box and the total charge amount of the battery box within an evaluation period; For any battery plug-in box, the standby energy consumption of the battery plug-in box is calculated based on the standby energy consumption of the battery plug-in box and the total charge amount of the battery plug-in box within an evaluation period.

7. The method according to claim 6, characterized in that The energy efficiency index value of the energy storage device dimension includes the battery efficiency of the energy storage battery, the average conversion efficiency of the energy storage converter, the average efficiency of the transformer, the DC side power line efficiency, the low voltage AC side power line efficiency, the high voltage AC side power line efficiency, and the power consumption of the auxiliary equipment of the inverter booster cabin. The method for determining the energy efficiency index value of the energy storage device dimension includes: For any energy storage battery, the battery efficiency of the energy storage battery is calculated based on the amount of electricity discharged from the energy storage battery and the amount of electricity charged into the energy storage battery during an evaluation period; For any energy storage converter, the average conversion efficiency of the energy storage converter is calculated based on the total energy output by the energy storage converter and the total energy input by the energy storage converter during an evaluation period; For any transformer, the average efficiency of the transformer is calculated based on the output active power of the transformer, the iron loss of the transformer, and the copper loss of the transformer during an evaluation period; For the DC side power line, the efficiency of the DC side power line is calculated based on the DC side rated current of the DC side power line and the resistance of the DC cable within the evaluation period; For the low-voltage AC side power line, the efficiency of the low-voltage AC side power line is calculated based on the low-voltage AC side rated current of the low-voltage AC side power line and the resistance of the low-voltage AC cable during the evaluation period; For the high-voltage AC side power line, the efficiency of the high-voltage AC side power line is calculated based on the high-voltage AC side rated current of the high-voltage AC side power line and the resistance of the high-voltage AC cable within the evaluation period; For any energy storage unit, the auxiliary equipment power consumption of the inverter booster compartment corresponding to the energy storage unit is calculated based on the auxiliary equipment power consumption of the energy storage unit and the auxiliary equipment power consumption of the battery compartment during the evaluation period.

8. The method according to claim 7, characterized in that The performing performance evaluation on the energy storage power station according to the energy efficiency index value includes: Obtaining a multi-level alarm interval corresponding to each of the energy efficiency index values; For any of the energy efficiency index values, the energy efficiency index value is matched with the corresponding multi-level alarm interval to obtain the target alarm interval corresponding to the energy efficiency index value, and an alarm signal is issued based on the alarm level corresponding to the target alarm interval.

9. The method according to claim 7, characterized in that: The performing performance evaluation on the energy storage power station according to the energy efficiency index value includes: For any of the evaluation dimensions, obtain the time series of indicator values ​​corresponding to the evaluation dimension in multiple evaluation cycles, and obtain a pre-trained indicator value early warning model corresponding to the evaluation dimension; The indicator value time series sequence is input into the indicator value early warning model to obtain the early warning result output by the indicator value early warning model.

10. A performance evaluation device for an energy storage power station, characterized in that: include: A collection module is used to collect performance-related parameters of the energy storage power station during the evaluation period; A calculation module, used to calculate the energy efficiency index values ​​corresponding to the energy storage power station in multiple evaluation dimensions according to the performance-related parameters, wherein the multiple evaluation dimensions at least include an energy storage power station dimension, a collector line dimension, an energy storage unit dimension, a battery cluster dimension, a battery plug box dimension, and an energy storage device dimension; An evaluation module is used to perform performance evaluation on the energy storage power station according to the energy efficiency index value.

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