Three-stage load automatic unloading method for power distribution system

Abstract

The application provides a three-level load automatic unloading method of a power distribution system, the power distribution system comprising two power supply lines connected through a bus tie switch, the method comprising: monitoring cable total power, three-level load power and power supply line capacity; when the power distribution system is normally powered, determining whether the cable total power meets the capacity of the normally powered power supply line when one power supply line loses power, and if so, performing three-level load unloading simulation according to the priority of each three-level load device on the power loss supply line to determine the target three-level load device needed to be unloaded to make the cable total power less than the capacity of the normally powered power supply line, and sending a marking instruction to the Internet of Things terminal to set an unloading mark for the target three-level load; when one power supply line loses power, automatically unloading the three-level load with the unloading mark set on the power loss supply line to power up the three-level load without the unloading mark after the bus tie switch is switched.

Description

Technical Field

[0001] This invention relates to the field of power and distribution system technology, and in particular to a three-level automatic load unloading method for a distribution system. Background Technology

[0002] In practical applications, power and distribution systems are designed with bus tie systems to ensure continuous and stable power operation. Buildings and other structures use dual power supplies; when one supply fails, the other automatically switches to power the lost circuit, ensuring a stable and continuous main power supply to the building. Because one power supply powers two existing lines, less critical tertiary loads need to be offloaded to ensure power supply to the main lines.

[0003] In existing technologies, the following two methods are generally used to unload the third-level load to ensure the power supply of important lines.

[0004] One approach is to directly unload tertiary loads without making any judgments. That is, when a power outage occurs, before the bus tie switching is performed, all tertiary loads are directly unloaded without dynamic judgment.

[0005] Another approach is to dynamically assess the power supply capacity and the current power usage to unload tertiary loads. That is, when a power outage occurs and the bus tie trips, all loads are first restored to power. Then, the power supply line capacity and the power usage are assessed, and a portion of the tertiary load is unloaded to ensure that the current power usage does not exceed the power supply line capacity.

[0006] Both existing solutions have various drawbacks: While directly unloading tertiary loads without assessment is simple to implement and ensures that the power used does not exceed the power supply line capacity to the greatest extent, it also results in resource waste because all tertiary loads are unloaded, even if there is a large surplus of power supply line capacity. Furthermore, it lacks flexibility due to the inability to dynamically adjust based on real-time load, negatively impacting the user experience.

[0007] Dynamic judgment, the method of unloading the third-level load after the bus tie is switched on or off. After the bus tie is switched on or off, the calculation and judgment of unloading the third-level load is carried out. Before unloading, there is a risk that the power used exceeds the capacity of the power supply line. Moreover, there is a risk that when the bus tie is switched off, the overall power used exceeds the capacity of a single power supply line, causing overload tripping, which in turn affects the overall power supply. Summary of the Invention

[0008] In view of the above problems, the present invention is proposed to provide a three-level automatic load unloading method for a power distribution system that overcomes or at least partially overcomes the above problems.

[0009] This invention provides a method for automatic three-level load offloading in a power distribution system. The power distribution system includes two power supply lines connected by a bus tie switch. The three-level load devices on each power supply line are monitored and controlled via an IoT terminal. The method includes: S11. Monitor the total power of the cables, the power of each tertiary load, and the capacity of each power supply line; S12. When the power distribution system is supplying power normally, determine whether the total power of the cables is greater than or equal to the capacity of the current normal power supply line when one power supply line loses power and the other normal power supply line supplies power to both power lines. If so, simulate the unloading of different level 3 loads based on the priority of each level 3 load device on the power supply line corresponding to the power loss line to determine the target level 3 load device. The target level 3 load device is the level 3 load device on the power loss line that needs to be unloaded so that the total power of the cables meets the capacity of the current normal power supply line. S13. Send a marking instruction to the IoT terminal corresponding to the target level 3 load device to set an unload mark for the target level 3 load device; S14. When a power supply line loses power, the third-level load equipment with the unloading mark on the power supply line is automatically unloaded, so that after the bus tie is switched on, only the third-level load equipment without the unloading mark is powered on.

[0010] Furthermore, the method also includes: If the total power of the cable is less than the capacity of the current normal power supply line when the normal power supply line is supplied by two power lines, then it is determined that no three-level load unloading is required after the bus tie switching. Correspondingly, when a power supply line loses power, the normal power supply line will power on all tertiary load devices on both power lines after the bus tie is switched on.

[0011] Furthermore, when the power distribution system is supplying power normally, steps S12 to S13 are executed periodically at preset time intervals to update the target level 3 load equipment and update the unloading flag settings.

[0012] Furthermore, the method also includes: After the bus tie is switched on, continuously monitor the total power of the cables and the capacity of the currently normal power supply lines; When the total power of the cable is detected to be at risk of exceeding the capacity of the current normal power supply line, or if the total power of the cable exceeds the capacity of the current normal power supply line, the third-level load is unloaded a second time according to the priority of each third-level load device that has been restored to power on the power failure line.

[0013] Furthermore, the method also includes: The three levels of load devices are pre-assigned based on their importance, and the three levels of load devices are prioritized.

[0014] In another aspect, an electronic device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the three-level automatic load offloading method for a power distribution system as described above.

[0015] In another aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the three-level automatic load offloading method for a power distribution system as described above.

[0016] The automatic three-level load unloading method for power distribution systems provided by this invention monitors the total power of cables, the power of each three-level load, and the capacity of each power supply line when the power distribution system is supplying power normally. Based on the total power of cables and the capacity of power supply lines, it determines in advance which three-level loads on the power supply line that need to be unloaded in the event of a power failure to ensure that the total power does not exceed the capacity of the normal power supply line. Unloading marks are made in advance before the power failure. By marking the unloading in advance, it is ensured that the overcapacity three-level loads will not be restored after the power failure bus tie, thereby minimizing the impact of bus tie switching on the use and ensuring continuous and stable power supply.

[0017] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. In the drawings: Figure 1 This is a flowchart of a three-level automatic load unloading method for a power distribution system according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the power supply line of the power distribution system according to an embodiment of the present invention. Detailed Implementation

[0019] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0020] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art and should not be interpreted in an idealized or overly formal sense unless specifically defined.

[0021] Figure 1 A flowchart of a three-level automatic load offloading method for a power distribution system provided in an embodiment of the present invention is shown. The power distribution system to which this method is applicable includes two power supply lines connected by a bus tie switch. The three-level load devices on each power supply line are monitored and controlled via IoT terminals. Each IoT terminal (or power distribution terminal, smart terminal) is connected to a centralized management platform via a communication network. The centralized management platform is used for information collection, calculation, instruction issuance, display, and centralized management. The platform's software carrier includes a computer, server, industrial control computer, intelligent central controller, or a single device or a group of devices.

[0022] like Figure 1 As shown, the three-level automatic load unloading method for a power distribution system provided by the present invention includes the following steps: S11. Monitor the total power of the cables, the power of each tertiary load, and the capacity of each power supply line.

[0023] The total power of the cable is the total active power of all currently used loads, which is the sum of the power of all operating level I, II, and III loads on the power supply lines corresponding to the two power supply lines.

[0024] In this embodiment, when the power distribution system is supplying power normally, the IoT terminal uploads the power consumption information of each load device to the centralized management platform. The centralized management platform calculates and monitors the total power of the cables, the power of the tertiary load devices on the two power supply lines, and the capacity of the two power supply lines.

[0025] S12. When the power distribution system is supplying power normally, determine whether the total power of the cables is greater than or equal to the capacity of the current normal power supply line when one power supply line loses power and the other normal power supply line supplies power to both power lines, based on the total power of the cables when the power distribution system is supplying power normally. If so, simulate the unloading of different level 3 loads based on the priority of each level 3 load device on the power supply line corresponding to the power loss line to determine the target level 3 load device. The target level 3 load device is the level 3 load device on the power loss line that needs to be unloaded so that the total power of the cables meets the capacity of the current normal power supply line.

[0026] In this embodiment, the centralized management platform periodically calculates and monitors the total power of the cables when the power distribution system is supplying power normally. By selecting the total power of the cables and the power of each tertiary load at a fixed time, a power failure simulation is performed to determine the target tertiary load devices on the power failure line that need to be unloaded to ensure that the total power does not exceed the capacity of the normal power supply line when a power supply line fails.

[0027] In practical applications, the importance of each load device is not exactly the same. In order to prioritize the continuous and stable operation of relatively important load devices, this invention pre-divides and designates load devices into three levels according to their importance, and prioritizes the three levels of load devices according to their importance, so as to prioritize unloading the relatively unimportant three-level load devices.

[0028] S13. Send a marking instruction to the IoT terminal corresponding to the target level 3 load device to set an unloading mark for the target level 3 load device.

[0029] S14. When a power supply line loses power, the third-level load equipment with the unloading mark on the power supply line is automatically unloaded, so that after the bus tie is switched on, only the third-level load equipment without the unloading mark is powered on.

[0030] Furthermore, if the total power of the cable is less than the capacity of the current normal power supply line when the normal power supply line is supplied by two power lines, then it is determined that no three-level load unloading is required after the bus tie switching. Correspondingly, when a power supply line loses power, the normal power supply line will power on all tertiary load devices on both power lines after the bus tie is switched on.

[0031] In this embodiment of the invention, in order to ensure that the unloading status of the tertiary load matches the overall system operation state when the power supply line loses power, the invention periodically executes steps S12 to S13 at preset time intervals when the power distribution system is supplying power normally, so as to update the target tertiary load equipment and update the unloading status at regular intervals. This ensures that when a power supply line loses power, the latest tertiary load equipment with the unloading status set on the power supply line that has lost power will be automatically unloaded, so as to ensure that the total power meets the capacity of the power supply line and minimize the impact of bus tie switching on the use.

[0032] In this embodiment of the invention, after the bus tie is switched on, the host computer continuously monitors the total power of the cable and the capacity of the current normal power supply line. When it is detected that the total power of the cable is at risk of exceeding the capacity of the current normal power supply line or the total power of the cable exceeds the capacity of the current normal power supply line, the third-level load is unloaded a second time according to the priority of each third-level load device that has been restored to power on the power failure line.

[0033] Figure 2 A schematic diagram of the power supply line of the power distribution system provided in an embodiment of the present invention is shown, with reference to... Figure 2 The power distribution system provided in this embodiment of the invention includes two power supply lines, namely power supply line 1 and power supply line 2, which are connected by a bus tie switch. The tertiary load devices on each power supply line are monitored and controlled via an IoT terminal. The power distribution system also includes... Figure 2 The centralized management platform, host computer, and IoT terminal devices are not shown in the diagram. The IoT terminal devices communicate with the host computer via fiber optic cables or network cables. The hardware core of the IoT terminal devices can use domestically produced microcontrollers and has fiber optic network interfaces or network cable interfaces. The host computer consists of one or more servers, serving as the highest-level processing node in the system, and has data processing, storage, and global resource scheduling functions.

[0034] exist Figure 2 In the illustrated embodiment, the two power lines are power line 1 and power line 2. The tertiary load devices of power line 1 include device 1, device 2, and device 3, and the tertiary load devices of power line 2 include device 4, device 5, and device 6. Devices 1, 2, 3, 4, 5, and 6 are all controlled by an IoT terminal to ensure they are powered. When the system is powered normally, it calculates the total cable power, the power of each tertiary load, and the capacity of the two power lines. The total power and the tertiary load power are frozen at fixed intervals. The frozen data is used for hypothetical calculations. Assuming power supply line 2 experiences a power outage, and power supply line 1 supplies power to both consumer lines 1 and 2, determine if the total power meets the capacity requirements of power supply line 1. If it does, then there's no need to unload the tertiary load devices on consumer line 2 after the bus tie switch. If not, simulate the unloading of different tertiary load devices on the de-energized power supply line according to their priority to determine the target tertiary load devices. For example, starting with tertiary load device 6, determine which devices (4, 5, and 6) will meet the capacity requirements of power supply line 1 after unloading. Calculate the target tertiary load devices to be unloaded and issue a marking command to the corresponding IoT terminal to control the IoT terminal to set an unloading mark for the target tertiary load devices.

[0035] Assuming power supply line 1 experiences a power outage, and power supply line 2 supplies power to both lines 1 and 2, the system determines whether the total power output meets the capacity requirements of power supply line 2. If it does, then there's no need to unload the tertiary load devices on line 1 after the bus tie switch. If not, the system simulates the unloading of different tertiary load devices on the de-energized power supply line according to their priority to determine the target tertiary load devices. For example, starting with tertiary load device 3, it determines which devices (devices 1, 2, and 3) will meet the capacity requirements of power supply line 2 after unloading. The system calculates the target tertiary load devices to be unloaded and sends a marking command to the corresponding IoT terminal to control the IoT terminal to set an unloading mark for the target tertiary load devices.

[0036] In actual use, when a power supply line loses power, all power is cut off on that side. After the bus tie is switched on, the tertiary load equipment is powered on according to the presence or absence of unloading indicators to ensure that the total power after the switch is less than the capacity of the power supply line and to maximize the power supply to the facilities. The specific process is as follows: If power supply line 2 loses power, all equipment on the power line 2 side will be de-energized. The IoT terminals of the three-level load devices 4, 5, and 6 will each determine if there is an unloading marker. If the three-level load device 6 has an unloading marker, but the three-level load devices 4 and 5 do not, after the bus tie is switched on, power supply line 1 will supply power to power lines 1 and 2. If the three-level load devices 4 and 5 do not have an unloading marker, the IoT terminals of the three-level load devices 4 and 5 will control the power supply circuits of the three-level load devices 4 and 5 to close, and after switching, normal power will be restored. If the three-level load device 6 has an unloading marker, the IoT terminal of the three-level load device 6 will control the power supply circuit of the three-level load device 6 to remain open, and after power is restored, power supply line 1 will not power device 6, ensuring that the total power is less than the capacity of power supply line 1.

[0037] If power supply line 1 loses power, all equipment on the line 1 side will be de-energized. The IoT terminals of the three-level load devices 1, 2, and 3 will each determine if there is an unloading marker. If the third-level load device 3 has an unloading marker, and the third-level load devices 1 and 2 do not, power supply line 2 will supply power to both line 1 and line 2 after the bus tie is switched on. If the third-level load devices 1 and 2 do not have an unloading marker, the IoT terminals of the third-level load devices 1 and 2 will close their power supply circuits, and normal power will be restored after switching. If the third-level load device 3 has an unloading marker, the IoT terminal of the third-level load device 3 will keep its power supply circuit disconnected. After power is restored, power supply line 2 will not power device 3, ensuring that the total power is less than the capacity of power supply line 2.

[0038] After the bus tie is completed, the host computer continuously monitors the total power and power supply line capacity, and unloads the third-level load in real time if there is a risk of exceeding the limit.

[0039] It should be noted that the IoT terminal's own power consumption is not affected by power supply line 1 or 2. That is, the IoT terminal can be powered by a DC power supply or an independent power supply, and can monitor the power consumption information of each load device in real time and read the unloading mark information at any time. It will not stop working due to the power failure of the circuit of the load device it is connected to, and can perform corresponding control according to the switching status and unloading mark information when a power supply line 1 loses power.

[0040] The automatic three-level load unloading method for power distribution systems provided by this invention monitors the total power of cables, the power of each three-level load, and the capacity of each power supply line when the power distribution system is supplying power normally. Based on the total power of cables and the capacity of power supply lines, it determines in advance which three-level loads on the power supply line that need to be unloaded in the event of a power failure to ensure that the total power does not exceed the capacity of the normal power supply line. Unloading marks are made in advance before the power failure. By marking the unloading in advance, it is ensured that the overcapacity three-level loads will not be restored after the power failure bus tie, thereby minimizing the impact of bus tie switching on the use and ensuring continuous and stable power supply.

[0041] For the sake of simplicity, the method embodiments are described as a series of actions. However, those skilled in the art should understand that the embodiments of the present invention are not limited to the described order of actions, because according to the embodiments of the present invention, some steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions involved are not necessarily essential to the embodiments of the present invention.

[0042] Another embodiment of the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the three-level automatic load offloading method for a power distribution system as described above.

[0043] Another embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the three-level automatic load offloading method for a power distribution system as described above.

[0044] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of the invention and form different embodiments. For example, any of the claimed embodiments can be used in any combination.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for automatic load unloading at three levels in a power distribution system, characterized in that, The power distribution system includes two power supply lines connected by a bus tie switch. The three-level load devices on each power supply line are monitored and controlled via an IoT terminal. The method includes: S11. Monitor the total power of the cables, the power of each tertiary load, and the capacity of each power supply line; S12. When the power distribution system is supplying power normally, determine whether the total power of the cables is greater than or equal to the capacity of the current normal power supply line when one power supply line loses power and the other normal power supply line supplies power to both power lines, based on the total power of the cables when the power distribution system is supplying power normally. If so, simulate the unloading of different level 3 loads based on the priority of each level 3 load device on the power supply line corresponding to the power loss line to determine the target level 3 load device. The target level 3 load device is the level 3 load device on the power loss line that needs to be unloaded so that the total power of the cables meets the capacity of the current normal power supply line. S13. Send a marking instruction to the IoT terminal corresponding to the target level 3 load device to set an unload mark for the target level 3 load device; S14. When a power supply line loses power, the third-level load equipment with the unloading mark on the power supply line is automatically unloaded, so that after the bus tie is switched on, only the third-level load equipment without the unloading mark is powered on.

2. The method according to claim 1, characterized in that, The method further includes: If the total power of the cable is less than the capacity of the current normal power supply line when the normal power supply line is supplied by two power lines, then it is determined that no three-level load unloading is required after the bus tie switching. Correspondingly, when a power supply line loses power, the normal power supply line will power on all tertiary load devices on both power lines after the bus tie is switched on.

3. The method according to claim 1 or 2, characterized in that, When the power distribution system is supplying power normally, steps S12 to S13 are executed periodically at preset time intervals to update the target level 3 load equipment and update the unloading flag settings.

4. The method according to claim 1 or 2, characterized in that, The method further includes: After the bus tie is switched on, continuously monitor the total power of the cables and the capacity of the currently normal power supply lines; When the total power of the cable is detected to be at risk of exceeding the capacity of the current normal power supply line, or if the total power of the cable exceeds the capacity of the current normal power supply line, the third-level load is unloaded a second time according to the priority of each third-level load device that has been restored to power on the power failure line.

5. The method according to claim 1 or 2, characterized in that, The method further includes: The three levels of load devices are pre-assigned based on their importance, and the three levels of load devices are prioritized.

6. An electronic device, characterized in that, It includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method as described in any one of claims 1-5.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method as described in any one of claims 1-5.

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