Operation income metering method and device of energy storage system

Abstract

The embodiment of the invention discloses an operation revenue metering method and device of an energy storage system. The method comprises the following steps: taking a point between a switching power supply and a direct-current battery as a metering point; and reading the current and voltage of the direct-current battery through the switching power supply, and calculating the direct-current income and equivalent alternating-current income of system energy storage. The operation benefit of the whole energy storage system can be calculated through metering at a new metering point (one point between the switching power supply and the direct-current battery), and compared with a traditional scheme, the method has the advantages that 1, the current and the voltage of the direct-current battery can be read on the switching power supply without additional metering equipment, and the current and the voltage of the direct-current battery can be calculated; the electric quantity and the energy storage income can be calculated; 2, the problem of inaccuracy of a baseline method is overcome, and the method can accurately record the operation income of the energy storage system no matter how the load changes; and 3, the problem that the'baseline method 'needs to frequently stop the operation of the energy storage system to obtain the'reference value' is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage systems, and in particular to a method and device for measuring operating income of an energy storage system. Background Art

[0002] Many energy storage systems require metering, but in some cases, when there is no dedicated metering equipment, how to measure the energy storage benefits is a challenge. There are more than 3 million communication base station backup power systems across the country, as well as millions of other types of backup power systems such as subways, hospitals, radar stations, and data centers. The backup power resources of these systems can all participate in energy operations as energy storage resources. However, there are no metering equipment in many of these occasions, so it is difficult to calculate the energy storage benefits. If metering equipment is added, costs will increase.

[0003] like Figure 1 As shown, the power supply system of the base station has three modes:

[0004] Normally: When the battery is fully charged, it neither charges nor discharges, and the AC input directly supplies power to the load;

[0005] Discharge: After the AC input stops, the battery discharges to the load;

[0006] Charging: AC input discharges the load and charges the battery at the same time.

[0007] If the energy storage benefits of the base station power supply system are to be measured, the solution adopted is: Figure 1 At the "AC input" shown, an AC energy meter is installed, and the "baseline method" is used to calculate the difference caused by whether the operation is started, so as to obtain the benefits. This solution has the following defects:

[0008] 1. An AC energy meter needs to be installed, which increases the hardware cost;

[0009] 2. The "baseline method" is an estimate. If the power consumption of the load changes frequently, this measurement method is very inaccurate.

[0010] 3. The “baseline method” requires frequent shutdown of the energy storage system to obtain the “baseline” measurement benchmark value, which increases operating costs. Summary of the invention

[0011] In view of the technical defects of the prior art, an object of the embodiments of the present invention is to provide a method and device for measuring the operating income of an energy storage system.

[0012] To achieve the above objectives, in a first aspect, an embodiment of the present invention provides a method for measuring the operating income of an energy storage system; wherein the energy storage system comprises an AC input terminal, a switching power supply, a DC battery and a DC load, the input terminal of the switching power supply is electrically connected to the AC input terminal, and the output terminal of the switching power supply is electrically connected to the DC battery and the DC load. Specifically, the measurement method comprises:

[0013] A point between the switching power supply and the DC battery is used as a measurement point;

[0014] The current and voltage of the DC battery are read through the switching power supply to calculate the DC gain of the system energy storage;

[0015] The equivalent AC benefit of the energy storage system is calculated based on the DC benefit of the energy storage of the system.

[0016] As a specific implementation of the present application, the DC benefit of the energy storage system is calculated as follows:

[0017] Electric quantity = current × voltage × time;

[0018] Discharge / charge electricity cost = electricity consumption per unit time × electricity price at that time;

[0019] The DC income of system energy storage = discharge electricity cost - charging electricity cost.

[0020] As a specific implementation method, the calculation process of equivalent AC benefits is:

[0021] Get the AC / DC conversion efficiency of the switching power supply;

[0022] Equivalent AC benefit = DC benefit of system energy storage / AC-DC conversion efficiency of switching power supply.

[0023] In a second aspect, an embodiment of the present invention further provides an operating income metering device for an energy storage system, comprising:

[0024] A setting module, used for setting a point between the switching power supply and the DC battery of the energy storage system as a metering point;

[0025] Revenue measurement module for:

[0026] The current and voltage of the DC battery are read through the switching power supply to calculate the DC gain of the system energy storage;

[0027] The equivalent AC benefit of the energy storage system is calculated based on the DC benefit of the system energy storage.

[0028] By implementing the energy storage system operating revenue measurement method provided in the embodiment of the present invention, the operating benefits of the entire energy storage system can be calculated by measuring at a new measurement point (a point between the switching power supply and the DC battery). Compared with the traditional revenue measurement scheme, the advantages are as follows:

[0029] 1. No additional metering equipment is needed. The current and voltage of the "DC battery" can be read on the "switch power supply" at all times, and the power can be calculated;

[0030] 2. Overcomes the inaccuracy of the “baseline method”: This method can accurately record the operating benefits of the energy storage system regardless of how the load changes;

[0031] 3. It overcomes the problem that the “baseline method” requires frequent shutdown of the energy storage system to obtain the “benchmark value”. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific implementation of the present invention or the technical solution in the prior art, the drawings required for use in the specific implementation or the description of the prior art are briefly introduced below.

[0033] Figure 1 It is a schematic diagram of the working mode of the power supply system of the base station;

[0034] Figure 2 It is a schematic diagram of the present invention;

[0035] Figure 3 is a flow chart of a method for measuring operating income of an energy storage system provided by an embodiment of the present invention;

[0036] Figure 4 It is a structural diagram of an operating income metering device for an energy storage system provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0039] Please refer to Figure 2 and Figure 3, an embodiment of the present invention provides a method for measuring the operating income of an energy storage system. The energy storage system includes an AC input terminal, a switching power supply, a DC battery and a DC load, the input terminal of the switching power supply is electrically connected to the AC input terminal, and the output terminal of the switching power supply is electrically connected to the DC battery and the DC load. It should be noted that the energy storage system can be a power supply system of a base station or a backup power system of a subway, hospital, radar station, data center, etc. As shown in the figure, the measurement method includes:

[0040] S1, a point between the switching power supply and the DC battery is used as the measurement point.

[0041] S2, reading the current and voltage of the DC battery through the switching power supply, and calculating the DC gain of the system energy storage.

[0042] S3, calculate the equivalent AC benefit of the energy storage system based on the DC benefit of the system energy storage.

[0043] Specifically, in this embodiment, the revenue calculation process is as follows:

[0044] Electricity (kWh) = current (A) × voltage (V) × time (min) / 60 minutes / 1000;

[0045] Discharge / charge electricity fee (yuan) = electricity per unit time (kWh) × electricity price at that time (yuan / kWh);

[0046] DC revenue of system energy storage (RMB) = discharge electricity cost - charging electricity cost;

[0047] Equivalent AC benefit (yuan) = DC benefit of system energy storage / AC / DC conversion efficiency of switching power supply.

[0048] It should be noted that the above profit calculation method already includes battery self-discharge loss, etc.

[0049] From the above description, it can be seen that by implementing the energy storage system operation revenue measurement method provided in the embodiment of the present invention, the operation benefit of the entire energy storage system can be calculated by measuring at a new measurement point (a point between the switching power supply and the DC battery). Compared with the traditional revenue measurement solution, the advantages are as follows:

[0050] 1. No additional metering equipment is needed. The current and voltage of the "DC battery" can be read on the "switch power supply" at all times, and the power can be calculated;

[0051] 2. Overcomes the inaccuracy of the “baseline method”: This method can accurately record the operating benefits of the energy storage system regardless of how the load changes;

[0052] 3. It overcomes the problem that the “baseline method” requires frequent shutdown of the energy storage system to obtain the “benchmark value”.

[0053] Based on the same inventive concept, the present embodiment of the present invention also provides an operating income metering device for an energy storage system, such as Figure 4 As shown, including:

[0054] A setting module 10 is used to set a point between the switching power supply and the DC battery of the energy storage system as a metering point;

[0055] The revenue measurement module 20 is used to:

[0056] The current and voltage of the DC battery are read through the switching power supply to calculate the DC gain of the system energy storage;

[0057] The equivalent AC benefit of the energy storage system is calculated based on the DC benefit of the system energy storage.

[0058] Furthermore, the revenue measurement module 20 is specifically used for:

[0059] Electric quantity = current × voltage × time;

[0060] Discharge / charge electricity cost = electricity consumption per unit time × electricity price at that time;

[0061] The DC revenue of system energy storage = discharge electricity cost - charging electricity cost;

[0062] Get the AC / DC conversion efficiency of the switching power supply;

[0063] Equivalent AC benefit = DC benefit of system energy storage / AC-DC conversion efficiency of switching power supply.

[0064] It should be noted that the specific working process of this embodiment can be found in the aforementioned method embodiment part, which will not be described in detail here.

[0065] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A method for measuring the operating income of an energy storage system, characterized in that: The energy storage system includes an AC input terminal, a switching power supply, a DC battery and a DC load, the input terminal of the switching power supply is electrically connected to the AC input terminal, the output terminal of the switching power supply is electrically connected to the DC battery and the DC load, and the metering method includes: A point between the switching power supply and the DC battery is used as a measurement point; The current and voltage of the DC battery are read through the switching power supply to calculate the DC gain of the system energy storage; The equivalent AC benefit of the energy storage system is calculated based on the DC benefit of the energy storage of the system.

2. The method for measuring the operating income of the energy storage system according to claim 1, characterized in that: The DC benefit of the energy storage of the system is calculated as follows: Electric quantity = current × voltage × time; Discharge / charge electricity cost = electricity consumption per unit time × electricity price at that time; The DC income of system energy storage = discharge electricity cost - charging electricity cost.

3. The method for measuring the operating income of the energy storage system according to claim 1, characterized in that: The calculation process of equivalent AC benefits is: Get the AC / DC conversion efficiency of the switching power supply; Equivalent AC benefit = DC benefit of system energy storage / AC-DC conversion efficiency of switching power supply.

4. An operating income metering device for an energy storage system, characterized in that: include: A setting module, used for setting a point between the switching power supply and the DC battery of the energy storage system as a metering point; Revenue measurement module for: The current and voltage of the DC battery are read through the switching power supply to calculate the DC gain of the system energy storage; The equivalent AC benefit of the energy storage system is calculated based on the DC benefit of the energy storage of the system.

5. The operating income metering device for the energy storage system according to claim 4, characterized in that: The revenue measurement module calculates the DC revenue of the system energy storage, specifically: Electric quantity = current × voltage × time; Discharge / charge electricity cost = electricity consumption per unit time × electricity price at that time; The DC income of system energy storage = discharge electricity cost - charging electricity cost.

6. The operating income metering device for the energy storage system according to claim 4, characterized in that: The revenue measurement module calculates the equivalent exchange revenue, specifically: Get the AC / DC conversion efficiency of the switching power supply; Equivalent AC benefit = DC benefit of system energy storage / AC-DC conversion efficiency of switching power supply.

7. The operating income metering device for the energy storage system according to claim 4, characterized in that: The energy storage system is a power supply system of a base station or a backup power system of a subway, hospital, radar station, or data center.

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