Seamless switching operation method for multiple energy storage devices

Abstract

The invention provides a seamless switching operation method for multiple energy storage devices, which comprises the following steps of: respectively establishing an energy storage system control module in each energy storage device, then establishing a master control module, establishing a current session in the energy storage system control module, and communicating with a terminal of a discharge device; obtaining a physical address coordinate; acquiring an electric quantity identifier; constructing a switching request; switching requests are continuously sent to the master control module, and the master control module calculates and records time identifications according to the switching requests and classifies the time identifications at the same time; time identifiers are continuously sent to the area where the worker is located or the carried terminal, and the worker selects whether to connect the energy storage device with the charging pile or not according to the time identifiers of different levels; after the energy storage equipment is connected with the charging pile, a discharging session is constructed, the master control module selects other energy storage equipment to join in the discharging session, and after other energy storage equipment successfully joins in the discharging session and constructs a new switching request, the original energy storage equipment leaves the discharging session and stops discharging.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage energy storage systems, and in particular to a seamless switching operation method for multiple energy storage devices. Background Art

[0002] Construction site electricity consumption usually shows obvious peak-valley electricity price differences. Utilizing new energy to achieve peak-valley arbitrage is an effective way to reduce electricity costs. By deploying a mobile energy storage system, a construction site can charge during the valley period with a lower electricity price and release the stored electrical energy during the peak period with a higher electricity price, thereby effectively reducing expenses. In addition, the flexibility of the mobile energy storage system enables it to adapt to the needs of different projects and support batch charging and discharging to achieve more efficient electricity utilization.

[0003] However, traditional mobile energy storage systems have the defects of only supporting the off-grid mode and being unable to connect to the power grid, and only supporting a single charging method. If construction work is carried out in a remote area, the cost of transporting energy storage boxes is too high and the time span is large; building a distribution room for construction site electricity consumption and charging energy storage boxes is likely to extend the construction period and reduce flexibility at the same time.

[0004] Therefore, there is an urgent need for a method that can be applied in both grid-connected and off-grid modes and can achieve seamless switching operation of multiple energy storage devices. Summary of the Invention

[0005] To solve the above problems, the present invention is implemented as follows:

[0006] A seamless switching operation method for multiple energy storage devices includes the following steps:

[0007] Establish an energy storage system control module in each energy storage device respectively, and then establish a master control module. The master control module is respectively communicatively connected to each energy storage system control module. Establish a current session in the energy storage system control module and communicatively connect it to the terminal of the discharging device;

[0008] Obtain the physical address coordinates of this energy storage device;

[0009] Obtain the power quantity identifiers of this energy storage device and the discharging device;

[0010] Construct a switching request with the physical address coordinates and power quantity identifiers;

[0011] Continuously send the switching request to the master control module. The master control module calculates the time required for the internal energy storage device with different physical address coordinates to reach the threshold power quantity according to the switching request and records it as a time identifier, and at the same time classifies the time identifier;

[0012] Continuously send time identifiers to the area where the staff is located or the terminals they carry, and the staff selects whether to connect the energy storage device to the charging pile according to the time identifiers of different levels;

[0013] After the energy storage device is connected to the charging pile, a discharge session is established. The master control module selects other energy storage devices to join the discharge session. After other energy storage devices successfully join the discharge session and a new switching request is constructed, the original energy storage device leaves the discharge session and stops discharging.

[0014] As a further improvement, before establishing the current session in the energy storage system control module, execute:

[0015] The master control module randomly selects at least one energy storage system control module of the energy storage devices to send a discharge signal, and the energy storage system control module that receives the discharge instruction turns on the discharge circuit breaker inside the energy storage device.

[0016] As a further improvement, after the discharge circuit breaker is turned on, the current is transmitted to the DCDC converter through the switching device, and the DCDC converter boosts or buck-boosts the voltage according to the requirements of the voltage and the energy storage system.

[0017] As a further improvement, after the DCDC converter boosts or buck-boosts the voltage, execute:

[0018] The electric energy flows to the PCS module, and the PCS module converts the high-voltage direct current into alternating current.

[0019] As a further improvement, the master control module selects two of the energy storage devices to perform the discharge behavior, and conducts bidirectional power transmission with the external power grid through the PCS to ensure that the system can automatically adjust when the load changes.

[0020] As a further improvement, the specific process of obtaining the power quantity identifiers of this energy storage device and the discharging device specifically includes:

[0021] Obtain the power consumption information of the discharging device communicatively connected to this energy storage device, and at the same time obtain the power quantity storage information inside this device, and organize and save them as power quantity identifiers.

[0022] As a further improvement, the physical address coordinate is the numbering information or coding information preset inside the energy storage device.

[0023] As a further improvement, the time identifiers are classified into at least two levels according to the time required to reach the threshold power quantity. When the time identifiers of multiple energy storage devices in the same system are all at levels lower than the preset duration threshold, an alarm will be sent to the area where the staff is located or the terminals they carry to urge them to perform the action of connecting to the charging pile.

[0024] As a further improvement, the actions for constructing a discharge session specifically include:

[0025] Introduce other energy storage devices to be connected in parallel to the DCDC converter.

[0026] As a further improvement, for the DCDC bidirectional converter, the input to output is in BOOST mode, and the output to input is in BUCK mode. The INP-DCDC used in conjunction with the INP energy storage converter can increase the battery voltage range, which can range from 300V to 900V;

[0027] The whole machine adopts multiple modular interleaved parallel topologies;

[0028] The PCS realizes rectification and inversion through a three-phase three-level converter.

[0029] The beneficial effects of the present invention are as follows:

[0030] The present invention realizes the PCS built into each energy storage device and changes it to be configured with one PCS by the master control module to uniformly manage a single energy storage module, achieving a seamless switching operation method for multiple energy storage devices. In the grid-connected operation mode, the energy storage device outputs through the PCS and is connected to the grid, and the STS remains closed to ensure stable power supply. In the off-grid operation mode, when the power grid is powered off or fails, the STS automatically disconnects, and the energy storage system quickly switches to the off-grid power supply state. It supports the independent operation of a single energy storage module, adapts to small-scale power demands, and can also realize the parallel operation of two energy storage modules at the DCDC output end under normal conditions to improve the power supply capacity.

[0031] During the discharge process, the energy storage devices discharge through their respective DCDCs. When the SOC value of an energy storage device drops to the set threshold, the master control module will select a standby energy storage device to connect and start discharging. At this time, at least two DCDCs of the energy storage devices work simultaneously to ensure uninterrupted power supply. Subsequently, the power-deficient energy storage device can be safely disconnected, maintaining the working state of the original other energy storage modules and achieving efficient seamless switching. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is the schematic diagram of the DC power supply switching control of the present invention.

[0033] Figure 2 It is the schematic diagram of the PCS of the present invention.

[0034] Figure 3 It is the UI diagram of the control operation interface of the energy storage device provided by the present invention.

[0035] Figure 4 It is the UI status diagram of the system device operation summary information of the energy storage device provided by the present invention.

[0036] Figure 5 To Figure 4 Click to enter the UI status diagram for viewing the specific device operation information.

[0037] Figure 6 This is the UI diagram of the energy storage system BMS operation data viewing page of the present invention.

[0038] Figure 7 For Figure 6 This is the UI diagram of the energy storage system BMS module information displayed after clicking to enter the module information.

[0039] Figure 8 This is the UI diagram of the energy storage management interface of the energy storage system provided by the present invention.

[0040] Figure 9 This is the UI diagram of the energy storage management interface of the energy storage system provided by the present invention. Detailed implementation manners

[0041] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0042] In the description of the present invention, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0043] A seamless switching operation method for multiple energy storage devices includes the following steps:

[0044] Establish an energy storage system control module in each energy storage device respectively, and then establish a master control module. The master control module is respectively communicatively connected to each of the energy storage system control modules. Establish a current session in the energy storage system control module and communicatively connect it to the terminal of the discharging device;

[0045] The instruction languages for constructing the master control module and the energy storage system control module are JavaScript and html5.

[0046] Mainly including,

[0047] Strategy template:

[0048] Get the element with the class name "el-form-item el-form-item--small", and get the content of the lower-level <label> element.

[0049] Get the element with the class name "el-input el-input--small fourBorder" at the same level as the <label>, and get the lower level. Element, when the label content is the simulation name, input the template name; when it is the demand threshold, input a number in the range of 0 to 100; when it is the load threshold, input a number in the range of 0 to 100. Obtain the element with the class name fourBorder fixWidth lineBorders, and obtain the lower-level div and input elements. Obtain the values within the corresponding input ranges of the start time, end time, and control type respectively. Multiple entries can be input. Ensure that the start time of the first entry is 00:00 and the end time of the last entry is 24:00. Enter appropriate values for the planned power of each entry, positive for charging and negative for discharging. Click Save to complete a policy template.

[0050] Policy Management:

[0051] Obtain the element with the class name el-form-item el-form-item--small, and obtain the lower-level label and input elements. When the label content is the start time and end time, enter the corresponding time range values in the input element, and the start time is less than the end time. When the label content is "Whether to prevent reverse current", "Power tracking", or "Whether to take effect", set the selection or not for the lower-level with the class name switch ng-isolate-scope ng-valid ng-not-empty. Click Save to run the policy.

[0052] Obtain the physical address coordinates of this energy storage device;

[0053] Obtain the power identifiers of this energy storage device and the discharging device;

[0054] Construct a switching request with the physical address coordinates and power identifiers;

[0055] Continuously send the switching request to the master control module. The master control module calculates the time required for the energy storage device with different physical address coordinates to reach the threshold power and records it as the time identifier, and at the same time classifies the time identifier;

[0056] Continuously send the time identifier to the area where the staff is located or the terminal carried by the staff. The staff selects whether to connect the energy storage device to the charging pile according to the time identifier of different levels;

[0057] After the energy storage device is connected to the charging pile, construct a discharging session. The master control module selects other energy storage devices to join the discharging session. After other energy storage devices successfully join the discharging session and construct a new switching request, the original energy storage device leaves the discharging session and stops discharging.

[0058] As a further improvement, before establishing the current session within the energy storage system control module, the following operations are performed:

[0059] The master control module optionally sends a discharge signal to the energy storage system control module of at least one of the energy storage devices, and the energy storage system control module that receives the discharge instruction closes the discharge circuit breaker inside the energy storage device.

[0060] As a further improvement, after closing the discharge circuit breaker, the current is transmitted to the DCDC converter through the switching device, and the DCDC converter boosts or buck-boosts the voltage according to the voltage and the requirements of the energy storage system.

[0061] As a further improvement, after the DCDC converter boosts or buck-boosts the voltage, the following operations are performed:

[0062] The electric energy flows to the PCS module, and the PCS module converts high-voltage direct current into alternating current.

[0063] As a further improvement, the master control module selects two of the energy storage devices to perform the discharge behavior, and performs bidirectional power transmission with the external power grid through the PCS to ensure that the system can automatically adjust when the load changes.

[0064] As a further improvement, the specific process of obtaining the power quantity identification of this energy storage device and the discharge device specifically includes:

[0065] Obtain the power consumption information of the discharge device communicatively connected to this energy storage device, and at the same time obtain the power quantity storage information inside this device, and organize and save it as the power quantity identification.

[0066] As a further improvement, the physical address coordinate is the number information or coding information preset inside the energy storage device.

[0067] As a further improvement, the time identification is classified into at least two levels according to the time required to reach the threshold power quantity. When the time identifications of multiple energy storage devices in the same system are all at levels lower than the preset duration threshold, an alarm will be sent to the area where the staff is located or the terminal carried by the staff to urge them to perform the action of connecting to the charging pile.

[0068] As a further improvement, the specific process of constructing the discharge session specifically includes:

[0069] Introduce other energy storage devices to be connected in parallel to the DCDC converter.

[0070] As a further improvement, for the DCDC bidirectional converter, the input to output is in BOOST mode, and the output to input is in BUCK mode. The INP-DCDC used in cooperation with the INP energy storage converter can increase the battery voltage range, and the battery voltage range can be from 300V to 900V;

[0071] The whole machine adopts multiple modular interleaved parallel topologies;

[0072] The PCS realizes rectification and inversion through a three-phase three-level converter.

[0073] Specifically, the parameters of the energy storage device are as follows:

[0074] 1) The battery cells used in the energy storage module: 280Ah / 314Ah lithium iron phosphate square case;

[0075] 2) The number of series and parallel connections of the battery cells in the energy storage module: 1P192S;

[0076] 3) The nominal voltage of the energy storage module: 614.4V;

[0077] 4) The electricity quantity of the energy storage module: 172kWh / 193kWh;

[0078] 5) The protection level of the energy storage module: IP54;

[0079] 6) The thermal management method of the energy storage module: liquid cooling

[0080] 7) The external dimensions of the energy storage module: 2100X1200X1250mm;

[0081] 8) The weight of the energy storage module: about 1700kg;

[0082] The energy density of the energy storage module: 96Wh / Kg - 108Wh / Kg. The DCDC parameters of the energy storage device are as follows in the table:

[0083]

[0084] The PCS parameters of the master control module are as follows in the table:

[0085]

[0086]

[0087] Refer to the attached drawings of the specification Figure 3 , after the step of "continuously sending time identifiers to the area where the staff is located or the terminal carried by the staff, and the staff selects whether to connect the energy storage device to the charging pile according to different levels of the time identifiers", the optional operation modes of the staff include:

[0088] Off-grid discharging: Click the off-grid discharging button on the home page interface, a confirmation window for executing off-grid discharging will pop up, and after clicking the confirmation, the energy storage system starts off-grid discharging;

[0089] Automatic mode: Click the automatic mode button on the home page interface, and an automatic mode confirmation window will pop up. Click Confirm, and the energy storage system will start running the peak shaving and valley filling strategy for automatic charging and discharging. Specifically, in the automatic mode, the following steps are executed:

[0090] Obtain the physical address coordinates of this energy storage device;

[0091] Obtain the power identification of this energy storage device and the discharging device;

[0092] Construct a switching request with the physical address coordinates and power identification;

[0093] Continuously send the switching request to the master control module. The master control module calculates the time required for the energy storage device with different physical address coordinates to reach the threshold power and records it as the time identification, and at the same time classifies the time identification.

[0094] The programming language for obtaining the click information is:

[0095]

[0096]

[0097] Shutdown mode: Click the shutdown button on the home page interface, and an execution shutdown confirmation window will pop up. Click Confirm, and the energy storage system shuts down.

[0098] The programming language for obtaining the click information is:

[0099]

[0100]

[0101] The above is only the preferred embodiment of the present invention and is not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A seamless switching operation method for multiple energy storage devices, characterized in that Including the following steps: A energy storage system control module is established in each energy storage device respectively, and then a master control module is established. The master control module is communicatively connected to each of the energy storage system control modules, and a current session is established in the energy storage system control module and communicatively connected to the terminal of the discharging device; Obtain the physical address coordinates of this energy storage device; Obtain the power quantity identifiers of this energy storage device and the discharging device; Construct a switching request with the physical address coordinates and the power quantity identifier; Continuously send the switching request to the master control module. The master control module calculates the time required for the energy storage device with different physical address coordinates to reach the threshold power quantity and records it as the time identifier, and at the same time classifies the time identifier; Continuously send the time identifier to the area where the staff is located or the terminal carried by the staff. The staff selects whether to connect the energy storage device to the charging pile according to the time identifiers of different levels; After the energy storage device is connected to the charging pile, a discharging session is constructed. The master control module selects other energy storage devices to join the discharging session. After other energy storage devices successfully join the discharging session and construct a new switching request, the original energy storage device leaves the discharging session and stops discharging.

2. The seamless switching operation method of multiple energy storage devices according to claim 1, characterized in that, Before establishing the current session in the energy storage system control module, execute: The master control module optionally sends a discharging signal to the energy storage system control module of at least one of the energy storage devices. The energy storage system control module that receives the discharging instruction turns on the discharging circuit breaker inside the energy storage device.

3. The seamless switching operation method of multiple energy storage devices according to claim 2, characterized in that, After turning on the discharging circuit breaker, the current is transmitted to the DCDC converter through the switching device. According to the voltage and the requirements of the energy storage system, the DCDC converter boosts or buck-boosts the voltage.

4. The seamless switching operation method of multiple energy storage devices as described in claim 3, characterized in that, After the DCDC converter boosts or buck-boosts the voltage, execute: The electric energy flows to the PCS module, and the PCS module converts the high-voltage direct current into alternating current.

5. The seamless switching operation method of multiple energy storage devices according to claim 4, characterized in that, The master control module selects two of the energy storage devices to perform the discharging behavior, and performs bidirectional power transmission with the external power grid through the PCS to ensure that the system can automatically adjust when the load changes.

6. The seamless switching operation method of multiple energy storage devices according to claim 1, characterized in that, The obtaining of the power quantity identifiers of this energy storage device and the discharging device specifically includes: Obtain the power consumption information of the discharging device communicatively connected to this energy storage device, and at the same time obtain the power quantity storage information inside this device, and organize and save it as the power quantity identifier.

7. The seamless switching operation method of multiple energy storage devices as claimed in claim 1, wherein, The physical address coordinates are the number information or coding information preset inside the energy storage device.

8. The seamless switching operation method of multiple energy storage devices according to claim 1, characterized in that, The classification of the time identifier is divided into at least two levels according to the time required to reach the threshold power quantity. When the time identifiers of multiple energy storage devices in the same system are all at levels lower than the preset duration threshold, an alarm will be sent to the area where the staff is located or the terminal carried by the staff to urge them to perform the action of connecting to the charging pile.

9. The seamless switching operation method of multiple energy storage devices according to claim 4, characterized in that, The behavior of constructing the discharging session specifically includes: Introduce other energy storage devices to be connected in parallel to the DCDC converter.

10. The seamless switching operation method of multiple energy storage devices according to claim 9, characterized in that, The DCDC bidirectional converter is in the B00ST mode from input to output and in the BUCK mode from output to input. The INP-DCDC is used in cooperation with the INP energy storage converter to increase the battery voltage range, and the battery voltage range can be from 300V to 900V; The whole machine adopts a plurality of modular interleaved parallel topologies; The PCS realizes rectification and inversion through a three-phase three-level converter.

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