Master-slave online control method and system of multi-cabin energy storage system and storage medium

Abstract

The application provides a master-slave online control method, system and storage medium of a multi-cabin energy storage system. The master-slave online control method of the multi-cabin energy storage system comprises the following steps: after power-on, a preset operation mode is autonomously identified; in response to a master mode, the power supply state of a load is controlled by a local SOC measured value and a preset SOC threshold value; and in response to a slave mode, power is supplied to the load according to the scheduling of the master. When the remaining power of the energy storage cabin as the master is insufficient, the slave is scheduled to supply power to the load, thereby meeting the long-time and uninterrupted off-grid microgrid power supply demand of the load, and achieving the purpose of improving the continuity and flexibility of off-grid power supply.

Description

Technical Field

[0001] This invention relates generally to the technical field of off-grid power supply for energy storage systems, and more specifically to a master-slave online control method, system, and storage medium for a multi-compartment energy storage system. Background Technology

[0002] In existing energy storage system applications, off-grid microgrid power supply typically relies on a single energy storage unit operating independently. Under this condition, the continuous power supply time to the load is limited by the remaining charge of the battery pack within the single energy storage unit. Once the battery is depleted, the energy storage unit must switch to grid-connected mode and be moved to an area with grid coverage for charging. During this charging period, the energy storage unit cannot continue to supply power to the load. This means that relying solely on a single energy storage unit cannot meet the long-term, uninterrupted off-grid microgrid power supply needs of the load; it is necessary to replace it with another energy storage unit to maintain operation, and power supply to the load cannot continue during the replacement process. Therefore, this severely limits the continuity and flexibility of off-grid power supply. Summary of the Invention

[0003] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This summary section is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0004] To at least partially solve the above problems, the first aspect of the present invention provides a master-slave online control method for a multi-compartment energy storage system, the master-slave online control method for the multi-compartment energy storage system comprising the following steps: After powering on, it automatically recognizes the preset operating mode; In response to master mode, the power supply status of the local machine and slave machine to the load is controlled according to the actual SOC value of the local machine and the preset SOC threshold. In slave mode, power is supplied to the load according to the master's schedule.

[0005] According to the master-slave online control method of the multi-compartment energy storage system of the first aspect of the present invention, after power-on, the operating mode of each energy storage compartment can be determined autonomously as either master mode or slave mode based on a preset operating mode. The energy storage compartment operating in master mode can control the power supply status of itself and the slave compartments to the load based on the measured SOC value and a preset SOC threshold. The energy storage compartment operating in slave mode supplies power to the load according to the scheduling of the energy storage compartments in master mode. By adopting this technical solution, it is beneficial to schedule the slave compartments to supply power to the load when the remaining power of the master energy storage compartment is insufficient, thereby meeting the long-term, uninterrupted off-grid microgrid power supply needs of the load and achieving the goal of improving the continuity and flexibility of off-grid power supply.

[0006] Optionally, the power output from the local unit and the slave unit to the load is controlled based on the measured SOC value of the local unit and a preset SOC threshold, including: Obtain the host's measured SOC value and the load power demand on the load side; The measured SOC value is compared with a preset lower limit threshold to determine whether the measured SOC value is less than the lower limit threshold. In response to the measured SOC value being less than the lower limit threshold of SOC, the system sends a first scheduling message to the slave device, controlling 100% of the slave device's output load demand power to be used to power the load, and a first percentage of the slave device's output load demand power to be used to charge the master device, wherein the first percentage is less than or equal to 50% and the first percentage is not equal to zero.

[0007] Optionally, the power output from the local unit and the slave unit to the load is controlled based on the measured SOC value of the local unit and a preset SOC threshold, including: Obtain the host's measured SOC value and the load power demand on the load side; The measured SOC value is compared with a preset lower SOC threshold and a SOC maintenance threshold to determine whether the measured SOC value is greater than or equal to the lower SOC threshold and whether the measured SOC value is less than the SOC maintenance threshold. In response to the measured SOC value being greater than or equal to the lower limit threshold of SOC and less than the SOC holding threshold, the host supplies power to the load at a second percentage of the power required by the load and sends a second scheduling message to the slave to control the slave to output a third percentage of the power required by the load to supply power to the load. The sum of the second percentage and the third percentage is equal to 100%, and the second percentage is less than or equal to 30%.

[0008] Optionally, the power output from the local unit and the slave unit to the load is controlled based on the measured SOC value of the local unit and a preset SOC threshold, including: Obtain the host's measured SOC value and the load power demand on the load side; The measured SOC value is compared with the preset SOC maintenance threshold and the SOC upper limit threshold to determine whether the measured SOC value is greater than or equal to the SOC maintenance threshold and whether the measured SOC value is less than the SOC upper limit threshold. In response to the measured SOC value being greater than or equal to the SOC holding threshold and the measured SOC value being less than the SOC upper limit threshold, the host supplies power to the load at a fourth percentage of the power required by the load and sends a third scheduling message to the slave to control the slave to output a fifth percentage of the power required by the load to supply power to the load. The sum of the fourth percentage and the fifth percentage is equal to 100%, the fourth percentage is greater than 30%, and the fourth percentage is less than or equal to the fifth percentage.

[0009] Optionally, the power output from the local unit and the slave unit to the load is controlled based on the measured SOC value of the local unit and a preset SOC threshold, including: Obtain the host's measured SOC value and the load power demand on the load side; The measured SOC value is compared with a preset upper limit threshold to determine whether the measured SOC value is greater than or equal to the upper limit threshold. In response to the measured SOC value being greater than or equal to the upper limit threshold of SOC, the host supplies power to the load at a sixth percentage of the power required by the load and sends a third scheduling message to the slave to control the slave to output a seventh percentage of the power required by the load to supply power to the load. The sum of the sixth percentage and the seventh percentage is equal to 100%, the sixth percentage is greater than 50% and the sixth percentage is less than 100%.

[0010] Optionally, during the process of scheduling the slave device to supply power to the load, the following steps are repeated: Obtain the measured SOC value of the slave device being called; The measured SOC value is compared with a preset lower SOC threshold to determine whether the measured SOC value is less than the lower SOC threshold. In response to the measured SOC value being less than the lower SOC threshold, the power output circuit of the slave device is disconnected, and scheduling information is sent to other slave devices.

[0011] Optionally, before sending scheduling information to other slave devices, the number of slave devices currently in standby mode is obtained, and it is determined whether the number of slave devices currently in standby mode is zero. If the number of slave devices currently in standby mode is not zero, scheduling information is sent to one of the other slave devices. If the number of slave devices currently in standby mode is zero, an alarm message is output to prompt for the addition of a slave device or charging of a slave device.

[0012] Optionally, before obtaining the measured SOC value of the host and the load demand power on the load side, controlling the power output of the host and slave to the load based on the measured SOC value of the host and a preset SOC threshold further includes: Obtain the status information of each slave device; The system counts the number of slave devices in standby mode and determines whether the number of slave devices in standby mode is zero. If the number of slave devices in standby mode is not zero, the system obtains the measured SOC value of the master device and the load power demand of the load side. If the number of slave devices in standby mode is zero, the system outputs an alarm message to prompt the system to add slave devices or charge the slave devices.

[0013] Optionally, power is supplied to the load according to the host's scheduling, including: Obtain the actual SOC value of the local machine; The measured SOC value is compared with a preset lower limit threshold to determine whether the measured SOC value is greater than the lower limit threshold. In response to the measured SOC value being greater than the lower limit threshold of SOC, the system maintains a standby state and sends current status information to the host, waiting for host scheduling. In response to the measured SOC value being less than or equal to the lower limit threshold of SOC, the slave device sends a power-down preparation status message to the host and waits for the host to disconnect the power output circuit of the slave device.

[0014] Optionally, supplying power to the load according to the host's scheduling also includes: Based on the host's scheduling information, the power output circuit is connected, and the actual SOC value of the device is continuously monitored and sent to the host.

[0015] A second aspect of the present invention provides a multi-compartment energy storage system, the multi-compartment energy storage system comprising: Multiple energy storage modules, each having a selectable master mode and a slave mode, one of the multiple energy storage modules being set to master mode, the remaining energy storage modules being set to slave mode, each energy storage module set to slave mode being electrically connected to the energy storage module set to master mode, each energy storage module comprising: Battery clusters; An energy storage converter is connected to the battery cluster and is used to connect to a load; Input devices are configured to be operated by a user to set master or slave mode; and The controller is communicatively connected to the battery cluster, the energy storage converter, and the input device. The controller is configured to execute the master-slave online control method for the multi-compartment energy storage system described above.

[0016] According to the multi-compartment energy storage system of the second aspect of the present invention, each energy storage compartment can autonomously determine its operating mode (master mode or slave mode) after power-on, based on a preset operating mode. The energy storage compartment operating in master mode can control the power supply status of itself and its slaves to the load based on the measured SOC value and a preset SOC threshold. The energy storage compartment operating in slave mode supplies power to the load according to the scheduling of the energy storage compartments in master mode. Through the coordinated operation of each energy storage compartment, it is beneficial to schedule slaves to supply power to the load when the remaining power of the master energy storage compartment is insufficient, thereby meeting the long-term, uninterrupted off-grid microgrid power supply needs of the load and improving the continuity and flexibility of off-grid power supply.

[0017] A third aspect of the present invention provides a computer-readable storage medium comprising a stored program, wherein, when the program is run, it controls the device containing the computer-readable storage medium to perform the master-slave online control method of the multi-compartment energy storage system described above.

[0018] According to the computer-readable storage medium of the third aspect of the present invention, when the program stored therein is run, it can control each energy storage module to autonomously identify and determine whether its operating mode is master mode or slave mode after power-on. The energy storage module operating in master mode can control the power supply status of itself and its slaves to the load based on the measured SOC value and a preset SOC threshold. The energy storage module operating in slave mode supplies power to the load according to the scheduling of the energy storage module in master mode. By adopting this technical solution, it is beneficial to schedule slaves to supply power to the load when the remaining power of the master energy storage module is insufficient, thereby meeting the long-term, uninterrupted off-grid microgrid power supply needs of the load and improving the continuity and flexibility of off-grid power supply. Attached Figure Description

[0019] The following drawings, which illustrate embodiments of the present invention, are included as part of this invention for understanding its principles. The drawings depict embodiments of the invention and their descriptions, serving to explain the principles of the invention. In the drawings, Figure 1 This is an overall flowchart of a master-slave online control method for a multi-compartment energy storage system according to an embodiment of the present invention; Figure 2 for Figure 1 A partial flowchart of step S2; Figure 3 for Figure 1 Another part of the flowchart for step S2; Figure 4 for Figure 1 Another part of the flowchart for step S2; Figure 5 for Figure 1 A partial flowchart of step S3; Figure 6 A schematic diagram of a multi-compartment energy storage system according to an embodiment of the present invention; and Figure 7 This is a schematic diagram of the structure of a computer-readable storage medium provided in an embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures: 100: Energy Storage Container 101: Battery Cluster 102: Energy Storage Converter 103: Controller 200: Computer-readable storage medium Detailed Implementation

[0021] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to those skilled in the art that embodiments of the invention may be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with embodiments of the invention.

[0022] To fully understand the embodiments of the present invention, detailed structures will be presented in the following description. Obviously, the implementation of the embodiments of the present invention is not limited to the specific details familiar to those skilled in the art.

[0023] It should be understood that the terminology used herein is intended only to describe particular embodiments and is not intended to limit the invention. The singular forms “a,” “an,” and “the” are also intended to include the plural forms unless the context clearly indicates otherwise. When the terms “comprising” and / or “including” are used in this specification, they indicate the presence of the stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof.

[0024] The ordinal numbers such as "first" and "second" used in this invention are merely identifiers and do not have any other meaning, such as a specific order. Furthermore, for example, the term "first component" does not imply the existence of a "second component," and the term "second component" does not imply the existence of a "first component." It should be noted that the terms "upper," "lower," "front," "rear," "left," "right," "inner," "outer," and similar expressions used in this invention are for illustrative purposes only and are not intended to be limiting.

[0025] The terms “center,” “parallel,” “perpendicular,” “aligned,” and “symmetrical” used in this invention do not have to be precise, but can include typical engineering tolerances.

[0026] Hereinafter, specific embodiments of the present invention will be described in more detail with reference to the accompanying drawings, which illustrate representative embodiments of the present invention and are not intended to limit the present invention.

[0027] It should be noted that SOC (State of Charge) mentioned below refers to the ratio of the remaining usable capacity of the energy storage battery to the rated battery capacity, usually expressed as a percentage (0-100%). SOC=0% means the battery is completely discharged, and SOC=100% means the battery is fully charged. It is a core parameter for energy storage systems to control charging and discharging, manage balancing, and monitor the status.

[0028] This invention provides a master-slave online control method, system, and storage medium for a multi-compartment energy storage system. See below for reference. Figures 1 to 6 The examples shown provide a detailed description of the master-slave online control method, system, and storage medium for the multi-compartment energy storage system according to the present invention.

[0029] See Figure 1 and combined Figure 6 This invention provides a master-slave online control method for a multi-compartment energy storage system. The master-slave online control method for a multi-compartment energy storage system includes the following steps: S1. After power-on, the machine automatically identifies the preset operating mode. If it is in master mode, it executes step S2; if it is in slave mode, it executes step S3. S2 controls the power supply status of the machine and slave to the load based on the actual SOC value of the machine and the preset SOC threshold. S3 supplies power to the load according to the host's schedule.

[0030] According to the master-slave online control method of the multi-compartment energy storage system of the present invention, after power-on, the operating mode of each energy storage compartment 100 can be determined autonomously as either master mode or slave mode based on a preset operating mode. The energy storage compartment 100 operating in master mode can control the power supply status of itself and the slave compartments to the load based on its measured SOC value and a preset SOC threshold. The energy storage compartment 100 operating in slave mode supplies power to the load according to the scheduling of the energy storage compartment 100 in master mode. By adopting this technical solution, it is beneficial to schedule the slave compartments to supply power to the load when the remaining power of the master energy storage compartment 100 is insufficient, thereby meeting the long-term, uninterrupted off-grid microgrid power supply needs of the load and improving the continuity and flexibility of off-grid power supply.

[0031] Continue reading Figure 2 and combined Figure 6 In this embodiment, step S2 includes: S21, obtain the host's measured SOC value and the load demand power on the load side; S22, compare the measured SOC value with the preset lower limit threshold, and determine whether the measured SOC value is less than the lower limit threshold. If the measured SOC value is less than the lower limit threshold, then execute step S23. S23, send the first scheduling information to the slave device, control 100% of the slave device's output load demand power to be used to power the load, and control a first percentage of the slave device's output load demand power to be used to charge the master device, wherein the first percentage is less than or equal to 50% and the first percentage is not equal to zero.

[0032] According to this embodiment, when the measured SOC value of the host is lower than the lower limit threshold of SOC, the slave device can be scheduled and controlled to supply power to the load and charge the host, thereby maintaining the continuity of power supply to the load while enabling the host to continuously schedule the slave device and retain the possibility of supplying power to the load again.

[0033] Furthermore, the first percentage is greater than or equal to 10%. It can be understood that the first percentage can be selected within a range greater than or equal to 10% and less than or equal to 50%. For example, the first percentage could be 10%, 15%, 16%, 19%, 20%, 22%, 23%, 26%, 30%, 35%, 40%, 45%, 47%, 49%, 50%, etc., without limitation here. Correspondingly, the total power output of the slave device needs to be 120% to 150% of the load demand power. For example, the percentage of the total power output of the slave device to the load demand power could be 110%, 115%, 116%, 119%, 120%, 122%, 123%, 126%, 130%, 135%, 140%, 145%, 147%, 149%, 150%, etc., without limitation here.

[0034] Optionally, the first percentage is greater than or equal to 20%. The percentage of the total power output by the slave device relative to the load power demand is greater than or equal to 120%.

[0035] Preferably, the first percentage is 20%. The percentage of the total power output by the slave device to the load demand is 120%.

[0036] Continue reading Figure 2 and combined Figure 6 In this embodiment, step S2 includes: S21, obtain the host's measured SOC value and the load demand power on the load side; S24, compare the measured SOC value with the preset lower SOC threshold and the SOC maintenance threshold respectively, and determine whether the measured SOC value is greater than or equal to the lower SOC threshold and whether the measured SOC value is less than the SOC maintenance threshold. If the measured SOC value is greater than or equal to the lower SOC threshold and the measured SOC value is less than the SOC maintenance threshold, then proceed to step S25. S25, the master supplies power to the load at a second percentage of the power required by the load, and sends a second scheduling message to the slave to control the slave to output a third percentage of the power required by the load to supply power to the load. The sum of the second percentage and the third percentage is equal to 100%, and the second percentage is less than or equal to 30%.

[0037] According to this embodiment, when the measured SOC value of the host is greater than or equal to the lower SOC threshold and less than the SOC maintenance threshold, the host can control the power supply to the load to be a second percentage of the power required by the load, and control the scheduled slave to supply power to the load to be a third percentage of the power required by the load. This results in the host with insufficient residual power outputting less power, while the scheduled slave outputting more power. This protects the normal operation of the host and its ability to schedule slaves, while also fully utilizing the power of the scheduled slaves to achieve continuous power supply to the load.

[0038] Furthermore, the third percentage is greater than or equal to zero. It can be understood that the third percentage can be chosen within a range greater than or equal to zero and less than or equal to 30%. For example, the third percentage could be 0, 3%, 5%, 6%, 8%, 10%, 15%, 16%, 19%, 20%, 22%, 23%, 26%, 30%, 35%, 40%, 45%, 47%, 49%, 50%, etc., without restriction. Correspondingly, the fourth percentage can be chosen within a range greater than or equal to 70% and less than or equal to 100%. For example, the fourth percentage could be 70%, 75%, 76%, 79%, 80%, 82%, 83%, 86%, 90%, 92%, 94%, 95%, 97%, 99%, 100%, etc., without restriction.

[0039] Optionally, the third percentage equals 10%. The fourth percentage equals 90%. See also... Figure 2 and combined Figure 6 In this embodiment, step S2 includes: S21, obtain the host's measured SOC value and the load demand power on the load side; S26, compare the measured SOC value with the preset SOC holding threshold and the SOC upper limit threshold respectively, and determine whether the measured SOC value is greater than or equal to the SOC holding threshold and whether the measured SOC value is less than the SOC upper limit threshold. If the measured SOC value is greater than or equal to the SOC holding threshold and the measured SOC value is less than the SOC upper limit threshold, then execute step S27. S27, the master supplies power to the load at a fourth percentage of the power required by the load, and sends a third scheduling message to the slave to control the slave to output a fifth percentage of the power required by the load to supply power to the load. The sum of the fourth percentage and the fifth percentage is equal to 100%, the fourth percentage is greater than 30%, and the fourth percentage is less than or equal to the fifth percentage.

[0040] According to this embodiment, when the measured SOC value of the host is greater than or equal to the SOC maintenance threshold and less than the upper limit threshold, the host and the scheduled slave devices are controlled to equally share the load power demand, thereby achieving power supply to the load. That is, when the host has relatively sufficient residual power, the host and slave devices are supplied with power in a balanced manner, which can maintain the continuous operation of the host and reduce the load on the slave devices.

[0041] Furthermore, the fourth percentage is less than or equal to 50%. It can be understood that the fourth percentage can be chosen within a range greater than 30% and less than or equal to 50%. For example, the fourth percentage could be 31%, 33%, 35%, 36%, 38%, 40%, 45%, 46%, 49%, 50%, etc., without restriction. Correspondingly, the fifth percentage can be chosen within a range greater than or equal to 50% and less than 70%. For example, the fifth percentage could be 50%, 55%, 56%, 59%, 60%, 62%, 63%, 66%, 67%, 68%, 69%, 70%, etc., without restriction.

[0042] Optionally, the fourth percentage equals 50%. The fifth percentage equals 50%.

[0043] Continue reading Figure 2 and combined Figure 6 In this embodiment, step S2 includes: S21, obtain the host's measured SOC value and the load demand power on the load side; S28. Compare the measured SOC value with the preset upper limit threshold to determine whether the measured SOC value is greater than or equal to the upper limit threshold. If the measured SOC value is greater than or equal to the upper limit threshold, then execute step S29. S29, the master supplies power to the load at a sixth percentage of the power required by the load, and sends a third scheduling message to the slave to control the slave to output a seventh percentage of the power required by the load to supply power to the load. The sum of the sixth percentage and the seventh percentage is equal to 100%, and the sixth percentage is greater than 50% and less than 100%.

[0044] According to this embodiment, when the measured SOC value of the host is greater than or equal to the upper limit threshold of SOC, the host bears the sixth percentage of the power required for the load, and the scheduled slave bears the seventh percentage of the power required for the load. That is, when the host has sufficient residual power, the host bears most of the power required for the load, thereby maintaining the host's ability to operate continuously while making full use of the host's own power and reducing the load on the called slave.

[0045] Furthermore, the sixth percentage is less than or equal to 90%. It can be understood that the sixth percentage can be chosen within a range greater than 50% and less than or equal to 90%. For example, the sixth percentage could be 51%, 53%, 55%, 56%, 58%, 60%, 65%, 66%, 69%, 70%, 71%, 73%, 75%, 76%, 79%, 80%, 83%, 86%, 87%, 88%, 89%, 90%, etc., without restriction. Correspondingly, the seventh percentage can be chosen within a range greater than or equal to 10% and less than 50%. For example, the seventh percentage could be 10%, 11%, 13%, 15%, 17%, 19%, 20%, 23%, 25%, 28%, 29%, 30%, 31%, 33%, 35%, 37%, 39%, 40%, 43%, 45%, 48%, 49%, etc., without restriction.

[0046] Optionally, the sixth percentage equals 60%. The seventh percentage equals 40%.

[0047] Steps S21 to S23 above can be understood as the first power allocation mode; steps S21, S24, and S25 can be understood as the second power allocation mode; steps S21, S26, and S27 can be understood as the third power allocation mode; and steps S21, S28, and S29 can be understood as the fourth power allocation mode. The switching between these four power allocation modes can be a smooth transition or a step-change transition. If a smooth transition is used, a slope control algorithm can be used to gradually adjust the power to avoid sudden power changes impacting the system or load.

[0048] It should be noted that the aforementioned upper limit threshold, lower limit threshold, and SOC maintenance threshold can all be flexibly set according to actual operating conditions. Specifically, the upper limit threshold ranges from 80% to 100%, the lower limit threshold ranges from 10% to 30%, and the maintenance threshold ranges from 30% to 50%. Furthermore, the upper limit threshold, lower limit threshold, and maintenance threshold must satisfy the following condition: lower limit threshold < maintenance threshold < upper limit threshold.

[0049] See Figure 3 and combined Figure 6 In this embodiment, during the process of scheduling the slave device to supply power to the load, the following steps are repeatedly executed: S201, obtain the actual SOC value of the called slave device; S202, compare the measured SOC value with the preset lower SOC threshold, determine whether the measured SOC value is less than the lower SOC threshold, and when the measured SOC value is less than the lower SOC threshold, control to disconnect the power output circuit of the slave device, and at the same time send scheduling information to other slave devices.

[0050] According to this embodiment, by monitoring the measured SOC value of the scheduled slave device, if the measured SOC value is lower than the lower threshold and cannot supply power to the load normally, the slave device can be removed from the system, and other slave devices can be scheduled. This helps to maintain the system's ability to supply power continuously and also protects the scheduled slave device, preventing its service life from being reduced due to excessive discharge.

[0051] In a further embodiment, during the execution of step S202, before sending scheduling information to other slave devices, the number of slave devices currently in standby state is obtained, and it is determined whether the number of slave devices currently in standby state is zero. If the number of slave devices currently in standby state is not zero, scheduling information is sent to one of the other slave devices. If the number of slave devices currently in standby state is zero, an alarm message is output to prompt for the addition of a slave device or the charging of a slave device.

[0052] According to this embodiment, by judging the number of slave devices in standby state, it is possible to determine whether there are any slave devices that can be scheduled. If there are, scheduling information is sent to schedule the slave device. If not, an alarm message is output to remind the operation and maintenance personnel to move the slave device to a charging location with a power grid for grid-connected charging, or to transfer the slave device with load requirements from other places.

[0053] See Figure 4 and combined Figure 6 In this embodiment, before performing step S21, step S2 further includes: S203, obtain the status information of each slave device; S204, count the number of slave devices in standby mode and determine whether the number of slave devices in standby mode is zero. If the number of slave devices in standby mode is not zero, execute step S21. If the number of slave devices in standby mode is zero, output an alarm message to prompt for additional slave devices or charging of slave devices.

[0054] According to this embodiment, before executing step S21, the number of slave devices in standby mode is screened and counted. This ensures that step S21 is executed while the number of slave devices in standby mode is not zero. This guarantees that there are available slave devices to be scheduled during step S21 and subsequent steps, thus ensuring power supply continuity and system stability. Simultaneously, while the number of slave devices in standby mode is not zero, alarm information is output to prompt for the addition of slave devices or charging of existing slave devices. This facilitates timely replenishment of slave devices' power or the addition of suitable slave devices while the master unit can still supply power to the load, maintaining the stability of subsequent power supply.

[0055] See Figure 5 and combined Figure 6 In this embodiment, step S3 includes: S31, obtain the actual SOC value of the local machine; S32, compare the measured SOC value with the preset lower limit threshold, and determine whether the measured SOC value is greater than the lower limit threshold. If the measured SOC value is greater than the lower limit threshold, then execute step S33. If the measured SOC value is less than or equal to the lower limit threshold, then execute step S34. S33, maintain standby state and send current status information to the host, waiting for host scheduling; S34 sends a power-down status message to the host and waits for the host to disconnect the power output circuit of the slave device.

[0056] According to this embodiment, the slave device can autonomously monitor its remaining power and, when the remaining power has not reached a lower limit, report to the master device that it is in a standby state that can be scheduled, so that it can be scheduled by the master device at any time. When the slave device's remaining power reaches the lower limit, it actively reports to the master device that it is preparing to power down, thereby waiting for the master device to disconnect the power output circuit of the slave device and stop working. After that, the slave device can be transferred to a location with grid-connected charging facilities for charging. After the slave device has finished charging, it is transported back to the location of the master device and reconnected to the master device.

[0057] It is understandable that after the slave device connects to the master device, the master device can obtain the status of the slave device through communication, and the master device can automatically determine whether the slave device can be scheduled.

[0058] Continue reading Figure 5 and combined Figure 6 In this embodiment, step S3 further includes: S35, based on the host's scheduling information, connects the power output circuit, continuously monitors the actual SOC value of the unit, and sends it to the host.

[0059] According to this embodiment, the slave device can switch states and connect the power output circuit according to the scheduling information sent by the master device to supply power to the load. At the same time, by continuously monitoring the actual SOC value of the slave device and feeding it back to the master device, the master device can determine whether to continue scheduling the slave device based on whether the actual SOC value has reached the lower limit during the process of the slave device supplying power to the load. This helps to prevent the scheduled slave device from affecting its service life due to over-discharge.

[0060] See Figure 6 Embodiments of the present invention also provide a multi-compartment energy storage system. The multi-compartment energy storage system includes multiple energy storage compartments 100. Each energy storage compartment 100 has a selectable master mode and a slave mode. One of the multiple energy storage compartments 100 is configured as the master mode. The remaining energy storage compartments 100 are configured as slave modes. Each energy storage compartment 100 configured as a slave is electrically connected to the energy storage compartment 100 configured as the master. Each energy storage compartment 100 includes a battery cluster 101, an energy storage converter 102, an input device, and a controller 103. The energy storage converter 102 is connected to the battery cluster 101 and is used to connect to a load to enable the battery cluster 101 to supply power to the load. The input device is configured to be operated by at least a user to set the master mode or slave mode. The controller 103 is communicatively connected to the battery cluster 101, the energy storage converter 102, and the input device. The controller 103 is configured to perform the master-slave online control method of the multi-compartment energy storage system described above.

[0061] According to an embodiment of the multi-compartment energy storage system of the present invention, each energy storage compartment 100 can autonomously determine its operating mode (master mode or slave mode) after power-on, based on a preset operating mode. The energy storage compartment 100 operating in master mode can control the power supply status of itself and its slaves to the load based on its measured SOC value and a preset SOC threshold. The energy storage compartment 100 operating in slave mode supplies power to the load according to the scheduling of the energy storage compartment 100 in master mode. Through the coordinated operation of each energy storage compartment 100, it is beneficial to schedule slaves to supply power to the load when the remaining power of the master energy storage compartment 100 is insufficient, thereby meeting the long-term, uninterrupted off-grid microgrid power supply needs of the load and improving the continuity and flexibility of off-grid power supply.

[0062] Optionally, each energy storage compartment 100 set to slave mode is electrically connected to an energy storage compartment 100 set to master mode, and then electrically connected to the load through the energy storage compartment 100 set to master mode.

[0063] It is understood that each energy storage compartment 100 is equipped with an independent controller 103 to realize energy management and control of the energy storage system. The controller 103 communicates independently with each energy storage converter 102 in the energy storage compartment 100 via communication cables, and can obtain the status information of the energy storage converter 102 and issue control commands to the energy storage converter 102. The energy storage converter 102 is also known as the PCS. The energy storage converter 102 has a DC side and an AC side. The DC side is connected to an independent battery cluster 101, and the AC side is coupled to the power grid or load equipment through a switch and an AC bus.

[0064] It is understood that when the controller 103 executes the master-slave online control method of the multi-compartment energy storage system described above, the controller 103 of the energy storage compartment 100 in master mode executes the master mode part of the master-slave online control method of the multi-compartment energy storage system described above, and the controller 103 of the energy storage compartment 100 in slave mode executes the slave mode part of the master-slave online control method of the multi-compartment energy storage system described above.

[0065] Optionally, the battery cluster 101 has a battery management system (BMS). The battery management system is responsible for real-time monitoring, protection, and equalization management of all cells within the battery cluster 101. The battery management system is communicatively connected to the controller 103 and is used to feed back the status information of the battery cluster 101 to the controller 103. The status information includes data such as SOC, SOH, voltage, and temperature.

[0066] In this embodiment, the input device is a remote device or part of a remote device. Alternatively, the input device is an input terminal device installed in the local energy storage system. The input device is used by the user to set the operating mode for each energy storage compartment 100.

[0067] Optionally, the controller 103 is an Energy Management System (EMS). The Energy Management System is responsible for monitoring, decision-making, and coordinated control of the energy storage compartment 100.

[0068] According to the present invention, the multiple energy storage system modules enable online and off-grid microgrid applications, featuring an architecture that distinguishes between master and slave modules. The energy storage module 100, acting as the master, provides off-grid voltage and frequency references. Multiple slave modules collaborate with the master to be dispatched to supplement the load's power supply. Any number of slave modules can be expanded to extend the off-grid power supply duration. In this embodiment, the master system can dispatch a maximum of 32 slave modules. This embodiment does not limit the maximum number of slave modules that the master can dispatch.

[0069] According to the present invention, when used in off-grid microgrid application scenarios, multiple energy storage modules 100 can be connected in series. One energy storage module 100 acts as the master to provide the voltage and frequency required by the load, while the other energy storage modules 100 act as slaves to provide the power required by the load. The number of slaves can be large, so that the energy storage system can provide power to the load for a long time. When the power of the slave reaches the set lower threshold, it can automatically exit the online system and automatically schedule other slaves, thereby realizing the off-grid microgrid application without shutdown.

[0070] See Figure 7 An embodiment of the present invention also includes a computer-readable storage medium. The computer-readable storage medium includes a stored program. When the program is run, it controls the device containing the computer-readable storage medium to execute the master-slave online control method for the multi-compartment energy storage system described above.

[0071] According to an embodiment of the present invention, a computer-readable storage medium, when its stored program is run, enables control over each energy storage module to autonomously identify and determine its operating mode (master mode or slave mode) after power-on. The energy storage module operating in master mode can control the power supply status of itself and its slaves to the load based on its measured SOC value and a preset SOC threshold. The energy storage module operating in slave mode supplies power to the load according to the scheduling of the energy storage module in master mode. By adopting this technical solution, it is beneficial to schedule slaves to supply power to the load when the remaining power of the master energy storage module is insufficient, thereby meeting the long-term, uninterrupted off-grid microgrid power supply needs of the load and improving the continuity and flexibility of off-grid power supply.

[0072] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for descriptive purposes only and is not intended to limit the invention. Terms such as “set” appearing herein can refer to either a component being directly attached to another component or a component being attached to another component via an intermediary. A feature described in one embodiment herein may be applied, alone or in combination with other features, to another embodiment, unless that feature is not applicable in that other embodiment or is otherwise stated.

[0073] The present invention has been described through the above embodiments; however, it should be understood that the above embodiments are for illustrative purposes only and are not intended to limit the present invention to the described embodiments. Those skilled in the art will understand that many variations and modifications can be made based on the teachings of the present invention, and all such variations and modifications fall within the scope of protection claimed by the present invention.

Claims

1. A master-slave online control method for a multi-compartment energy storage system, characterized in that, The master-slave online control method for the multi-compartment energy storage system includes the following steps: After powering on, it automatically recognizes the preset operating mode; In response to master mode, the power output from the machine and slave to the load is controlled based on the measured SOC value of the machine and the preset SOC threshold. In slave mode, power is supplied to the load according to the master's schedule.

2. The master-slave online control method for a multi-compartment energy storage system according to claim 1, characterized in that, The power output from the main unit and slave unit to the load is controlled based on the measured SOC value and the preset SOC threshold, including: Obtain the host's measured SOC value and the load power demand on the load side; The measured SOC value is compared with a preset lower limit threshold to determine whether the measured SOC value is less than the lower limit threshold. In response to the measured SOC value being less than the lower limit threshold of SOC, the system sends a first scheduling message to the slave device, controlling 100% of the slave device's output load demand power to be used to power the load, and a first percentage of the slave device's output load demand power to be used to charge the master device, wherein the first percentage is less than or equal to 50% and the first percentage is not equal to zero.

3. The master-slave online control method for a multi-compartment energy storage system according to claim 1, characterized in that, The power output from the main unit and slave unit to the load is controlled based on the measured SOC value and the preset SOC threshold, including: Obtain the host's measured SOC value and the load power demand on the load side; The measured SOC value is compared with a preset lower SOC threshold and a SOC maintenance threshold to determine whether the measured SOC value is greater than or equal to the lower SOC threshold and whether the measured SOC value is less than the SOC maintenance threshold. In response to the measured SOC value being greater than or equal to the lower limit threshold of SOC and less than the SOC holding threshold, the host supplies power to the load at a second percentage of the power required by the load and sends a second scheduling message to the slave to control the slave to output a third percentage of the power required by the load to supply power to the load. The sum of the second percentage and the third percentage is equal to 100%, and the second percentage is less than or equal to 30%.

4. The master-slave online control method for a multi-compartment energy storage system according to claim 1, characterized in that, The power output from the main unit and slave unit to the load is controlled based on the measured SOC value and the preset SOC threshold, including: Obtain the host's measured SOC value and the load power demand on the load side; The measured SOC value is compared with the preset SOC maintenance threshold and the SOC upper limit threshold, respectively. Determine whether the measured SOC value is greater than or equal to the SOC maintenance threshold and whether the measured SOC value is less than the SOC upper limit threshold; In response to the measured SOC value being greater than or equal to the SOC holding threshold and the measured SOC value being less than the SOC upper limit threshold, the host supplies power to the load at a fourth percentage of the power required by the load and sends a third scheduling message to the slave to control the slave to output a fifth percentage of the power required by the load to supply power to the load. The sum of the fourth percentage and the fifth percentage is equal to 100%, the fourth percentage is greater than 30%, and the fourth percentage is less than or equal to the fifth percentage.

5. The master-slave online control method for a multi-compartment energy storage system according to claim 1, characterized in that, The power output from the main unit and slave unit to the load is controlled based on the measured SOC value and the preset SOC threshold, including: Obtain the host's measured SOC value and the load power demand on the load side; The measured SOC value is compared with a preset upper limit threshold to determine whether the measured SOC value is greater than or equal to the upper limit threshold. In response to the measured SOC value being greater than or equal to the upper limit threshold of SOC, the host supplies power to the load at a sixth percentage of the power required by the load and sends a third scheduling message to the slave to control the slave to output a seventh percentage of the power required by the load to supply power to the load. The sum of the sixth percentage and the seventh percentage is equal to 100%, the sixth percentage is greater than 50% and the sixth percentage is less than 100%.

6. The master-slave online control method for a multi-compartment energy storage system according to any one of claims 1 to 5, characterized in that, During the process of scheduling the slave device to supply power to the load, the following steps are repeated: Obtain the measured SOC value of the slave device being called; The measured SOC value is compared with a preset lower SOC threshold to determine whether the measured SOC value is less than the lower SOC threshold. In response to the measured SOC value being less than the lower SOC threshold, the power output circuit of the slave device is disconnected, and scheduling information is sent to other slave devices.

7. The master-slave online control method for a multi-compartment energy storage system according to claim 6, characterized in that, Before sending scheduling information to other slave devices, obtain the number of slave devices currently in standby mode and determine whether the number of slave devices currently in standby mode is zero. If the number of slave devices currently in standby mode is not zero, send scheduling information to one of the other slave devices. If the number of slave devices currently in standby mode is zero, output an alarm message to prompt for additional slave devices or to charge the slave devices.

8. The master-slave online control method for a multi-compartment energy storage system according to any one of claims 1 to 5, characterized in that, Before obtaining the host's measured SOC value and the load demand power on the load side, the power output from the host and slave devices to the load is controlled based on the host's measured SOC value and a preset SOC threshold. This also includes: Obtain the status information of each slave device; The system counts the number of slave devices in standby mode and determines whether the number of slave devices in standby mode is zero. If the number of slave devices in standby mode is not zero, the system obtains the measured SOC value of the master device and the load power demand of the load side. If the number of slave devices in standby mode is zero, the system outputs an alarm message to prompt the user to add slave devices or charge the slave devices.

9. The master-slave online control method for a multi-compartment energy storage system according to any one of claims 1 to 5, characterized in that, Power is supplied to the load according to the host's schedule, including: Obtain the actual SOC value of the local machine; The measured SOC value is compared with a preset lower limit threshold to determine whether the measured SOC value is greater than the lower limit threshold. In response to the measured SOC value being greater than the lower limit threshold of SOC, the system maintains a standby state and sends current status information to the host, waiting for host scheduling. In response to the measured SOC value being less than or equal to the lower limit threshold of SOC, the slave device sends a power-down preparation status message to the host and waits for the host to disconnect the power output circuit of the slave device.

10. The master-slave online control method for a multi-compartment energy storage system according to claim 9, characterized in that, According to the host's scheduling, power is supplied to the load, which also includes: Based on the host's scheduling information, the power output circuit is connected, and the actual SOC value of the device is continuously monitored and sent to the host.

11. A multi-compartment energy storage system, characterized in that, The multi-compartment energy storage system includes: Multiple energy storage modules, each having a selectable master mode and a slave mode, one of the multiple energy storage modules being set to master mode, the remaining energy storage modules being set to slave mode, each energy storage module set to slave mode being electrically connected to the energy storage module set to master mode, each energy storage module comprising: Battery clusters; An energy storage converter is connected to the battery cluster and is used to connect to a load; Input devices are configured to be operated by a user to set master or slave mode; and A controller, communicatively connected to the battery cluster, the energy storage converter, and an input device, is configured to execute a master-slave online control method for a multi-compartment energy storage system according to any one of claims 1 to 10.

12. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein when the program is run, it controls the device containing the computer-readable storage medium to perform the master-slave online control method for a multi-compartment energy storage system according to any one of claims 1 to 10.

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