Long-distance low-voltage power distribution control method and system based on multi-closed loop control technology

Abstract

The application provides a long-distance low-voltage power distribution control method, system and device based on a multi-closed loop control technology and a computer readable storage medium, which automatically controls the voltage of a multi-chain power distribution trunk line and branch line throughout the process based on the rated voltage of a terminal device terminal, thereby realizing long-distance low-voltage power supply. A first voltage detection value of the terminal device terminal is obtained, a first numerical relationship between the first voltage detection value and a preset first reference voltage interval is obtained, and a voltage adjustment instruction is sent to a front intelligent relay power supply based on the first numerical relationship, so that the front intelligent relay power supply adjusts the voltage value delivered to the current intelligent relay power supply according to the voltage adjustment instruction. The application uses an intelligent relay power supply as an independent power distribution unit in the multi-chain power distribution trunk line, automatically detects the voltage of the intelligent relay power supply, and feeds back the voltage difference with the preset first reference voltage interval to the front intelligent relay power supply, thereby realizing automatic control of the voltage throughout the process of long-distance low-voltage power distribution.

Description

Technical Field

[0001] This application mainly relates to the field of long-distance low-voltage power distribution, and in particular to a long-distance low-voltage power distribution control method, system, device, and computer-readable storage medium based on multi-closed-loop control technology. Background Technology

[0002] The regulations regarding the distance for AC low-voltage power distribution are clearly stipulated in current national and local standards. However, there are no recommendations in specifications, standards, or design manuals for handling low-voltage power distribution exceeding the prescribed distance. Engineering technicians typically employ two methods: first, to bring the high-voltage electricity to the target location and then build a substation there to convert the high-voltage electricity to low-voltage for use; second, to enlarge the cross-section of the low-voltage transmission cable several times or even multiple times to ensure that the electrical equipment at the target location meets the voltage requirements.

[0003] These two methods are reasonable in conventional application scenarios (such as ground-based applications or remote locations with only a few electrical devices). However, rail transit projects mostly use underground structures, and the distance between stations on subway express lines and intercity railways can be several kilometers or even tens of kilometers. If the conventional solutions (building underground substations or increasing cable cross-sections) are still used to solve the power supply problem for low-voltage equipment in the intervals, the project cost will inevitably increase exponentially.

[0004] One characteristic of low voltage is that it drops rapidly during long-distance transmission, and the loop current increases accordingly as the terminal voltage decreases. Since transmission line losses are proportional to the square of the current, maintaining the terminal voltage near the rated value effectively reduces additional energy losses on the transmission line. Summary of the Invention

[0005] This application provides a long-distance low-voltage power distribution control method, system, device, and computer-readable storage medium based on multi-closed-loop control technology, thereby enabling long-distance transmission of low-voltage electricity and achieving full-process automatic control of low-voltage long-distance power distribution voltage.

[0006] To address the aforementioned technical problems, this application provides a long-distance low-voltage power distribution control method based on multi-closed-loop control technology, the long-distance low-voltage power distribution control method comprising:

[0007] Obtain its own first voltage detection value;

[0008] Obtain the first numerical relationship between the first voltage detection value and the preset first reference voltage range;

[0009] If the first voltage detection value exceeds the first reference voltage range, a voltage adjustment command is sent to the front-end intelligent relay power supply based on the first numerical relationship, so that the front-end intelligent relay power supply adjusts the voltage value delivered to the current intelligent relay power supply according to the voltage adjustment command.

[0010] The voltage regulation command includes the voltage value required for the current intelligent relay power supply to reach the first reference voltage range.

[0011] The acquisition of voltage detection data includes:

[0012] Obtain the second voltage detection value of the load located at the current smart relay power supply.

[0013] Obtain a second numerical relationship between the second voltage detection value and the operating voltage range of the load;

[0014] If the second voltage detection value exceeds the operating voltage range, a second voltage regulation command is sent to the front-end intelligent relay power supply based on the second numerical relationship, so that the front-end intelligent relay power supply adjusts the voltage value delivered to the current intelligent relay power supply and the load according to the second voltage regulation command.

[0015] The long-distance low-voltage power distribution control method further includes:

[0016] Detect the status of the rear intelligent relay power supply;

[0017] When the state of the rear intelligent relay power supply is abnormal, the third voltage detection value of the rear intelligent relay power supply is obtained.

[0018] Based on the third voltage detection value and the third reference voltage range of the rear intelligent relay power supply, the voltage value supplied to the rear intelligent relay power supply is adjusted.

[0019] The long-distance low-voltage power distribution control method further includes, after obtaining the third voltage detection value of the rear intelligent relay power supply:

[0020] When the third voltage detection value is 0, the second voltage detection value of itself is obtained;

[0021] If the second voltage detection value is greater than the first reference voltage range, a third voltage regulation command is sent to the front-end intelligent relay power supply so that the front-end intelligent relay power supply adjusts the voltage value delivered to the current intelligent relay power supply according to the third voltage regulation command.

[0022] Specifically, sending a voltage regulation command to the forward intelligent relay power supply based on the first numerical relationship includes:

[0023] Based on the first numerical relationship, the fourth reference voltage range of the front-end intelligent relay power supply and the wire and cable information between the front-end intelligent relay power supply are obtained.

[0024] A voltage regulation command is generated based on the first numerical relationship, the fourth reference voltage range, and the wire and cable information;

[0025] Send the voltage regulation command to the front-end intelligent relay power supply.

[0026] To address the aforementioned technical problems, this application provides a long-distance low-voltage power distribution control system based on multi-closed-loop control technology, comprising:

[0027] Substation;

[0028] A plurality of intelligent relay power supplies are connected in series, wherein one of the intelligent relay power supplies is electrically connected to the substation so that the substation provides power to the plurality of intelligent relay power supplies;

[0029] Each of the aforementioned intelligent relay power supplies is voltage-controlled using the long-distance low-voltage power distribution control method described above.

[0030] The long-distance low-voltage power distribution control system also includes several wires and cables, each of which is used to connect two intelligent relay power sources or intelligent relay power sources and their loads or intelligent relay power sources and the substation.

[0031] To address the aforementioned technical problems, this application provides a long-distance low-voltage power distribution control device.

[0032] The long-distance low-voltage power distribution control device includes a processor and a memory connected to the processor, wherein the memory stores program instructions;

[0033] The processor is used to execute program instructions stored in the memory to implement the long-distance low-voltage power distribution control method described above.

[0034] To address the aforementioned technical problems, this application provides a computer-readable storage medium storing program instructions that, when executed, implement the aforementioned long-distance low-voltage power distribution control method.

[0035] Compared with existing technologies, the beneficial effects of this application are as follows: This application proposes a long-distance low-voltage power distribution control method based on multi-closed-loop control technology. It obtains its own first voltage detection value, acquires a first numerical relationship between the first voltage detection value and a preset first reference voltage range, and when the first voltage detection value exceeds the first reference voltage range, sends a voltage regulation command to the upstream intelligent relay power supply based on the first numerical relationship. This causes the upstream intelligent relay power supply to adjust the voltage value delivered to the current intelligent relay power supply according to the voltage regulation command. This application uses intelligent relay power supplies as independent power distribution units in multi-chain power distribution trunk lines. Intelligent relay power supplies can achieve independent control and respond to commands; therefore, they can simultaneously act as master and slave controllers. Furthermore, intelligent relay power supplies can automatically detect their own voltage and feed back the voltage difference between the upstream intelligent relay power supply and the preset first reference voltage range. This allows the upstream intelligent relay power supply to respond to the corresponding voltage regulation command and adjust the voltage of the current intelligent relay power supply, ensuring that the voltage value of the current relay unit remains stable within the reference voltage range. The above methods enable the low-voltage power distribution control system to dynamically and automatically adjust the main and branch line voltages based on the requirement that the voltage at the load terminals meets the requirements, thus ensuring stable load operation. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0037] Figure 1 This is a flowchart illustrating the first embodiment of the long-distance low-voltage power distribution control method based on multi-closed-loop control technology provided in this application;

[0038] Figure 2 yes Figure 1 The diagram shows a long-distance low-voltage power distribution control system in a long-distance low-voltage power distribution control method based on multi-closed-loop control technology.

[0039] Figure 3 This is a flowchart illustrating the second embodiment of the long-distance low-voltage power distribution control method based on multi-closed-loop control technology provided in this application;

[0040] Figure 4 This is a flowchart illustrating the third embodiment of the long-distance low-voltage power distribution control method based on multi-closed-loop control technology provided in this application.

[0041] Figure 5 This is a flowchart illustrating the fourth embodiment of the long-distance low-voltage power distribution control method based on multi-closed-loop control technology provided in this application.

[0042] Figure 6 This is a schematic diagram of the framework of an embodiment of a long-distance low-voltage power distribution control system based on multi-closed-loop control technology provided in this application;

[0043] Figure 7 This is a schematic diagram of the framework of an embodiment of the long-distance low-voltage power distribution control device based on multi-closed-loop control technology provided in this application;

[0044] Figure 8 This is a schematic diagram of the structure of an embodiment of the computer storage medium provided in this application. Detailed Implementation

[0045] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0046] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0047] To address the aforementioned issues, this application proposes a long-distance low-voltage power distribution control method based on multi-closed-loop control technology. This method employs a first numerical relationship between its own first detected voltage and a preset first reference voltage range to send a voltage regulation command to the preceding intelligent relay power supply, thereby causing the preceding intelligent relay power supply to adjust the voltage value it delivers to the current intelligent relay power supply according to the voltage regulation command.

[0048] Please refer to the details. Figure 1 and Figure 2 , Figure 1 This is a flowchart illustrating the first embodiment of the long-distance low-voltage power distribution control method based on multi-closed-loop control technology provided in this application. Figure 2 yes Figure 1The diagram shows a long-distance low-voltage power distribution control system in a long-distance low-voltage power distribution control method based on multi-closed-loop control technology.

[0049] like Figure 1 As shown, the long-distance low-voltage power distribution control method based on multi-closed-loop control technology in this embodiment specifically includes the following steps:

[0050] Step S11: Obtain the first voltage detection value of itself.

[0051] Specifically, the first detected voltage value is the input voltage of the current intelligent relay power supply when it is in operation in the current long-distance low-voltage power distribution control system based on multi-closed-loop control technology. Each intelligent relay power supply used in this application has a built-in processor or any intelligent control module capable of receiving and processing control signals and instructions. Therefore, each intelligent relay power supply can both send instructions as a master controller and receive instructions as a slave controller, and can parse and process the above instructions. That is, any intelligent relay power supply in the long-distance low-voltage power distribution control system based on multi-closed-loop control technology can automatically detect and obtain its own first voltage detection value at any time interval during operation.

[0052] Please see below. Figure 2 In a long-distance low-voltage power distribution control system, any intelligent relay power supply can be designated as the current intelligent relay power supply. One or more intelligent relay power supplies upstream in the voltage transmission direction are designated as front-end intelligent relay power supplies, and one or more intelligent relay power supplies downstream in the voltage transmission direction are designated as rear-end intelligent relay power supplies. Each intelligent relay power supply in the system can connect to several external loads and provide operating voltage to these loads. For example, when intelligent relay power supply 3 is defined as the current intelligent relay power supply, intelligent relay power supply 1 and intelligent relay power supply 2 can be defined as front-end intelligent relay power supplies, and intelligent relay power supply 4 as a rear-end intelligent relay power supply. Furthermore, load 2 is an external load connected to intelligent relay power supply 3.

[0053] Each smart repeater power supply includes at least three ports: the first port is an input port, the second port is a trunk output port, and the third port is a load output port. In other embodiments, the number of trunk output ports and load output ports can be expanded according to specific circumstances.

[0054] Optionally, each intelligent relay power supply consists of multiple rows of special magnetic balancing devices and contactless electronic circuits. It also integrates, but is not limited to, the following units: phase adjustment unit, voltage compensation and balancing unit, power isolation and filtering unit, power factor compensation unit, surge factor compensation unit, surge protection unit, remote monitoring and end data feedback unit, etc.

[0055] Optionally, the voltage compensation and balancing unit comprises a compensation circuit, a voltage regulation circuit, a control circuit, an input sampling circuit, an output control circuit, a protection circuit, and a bypass circuit. When the input voltage fluctuates or the load changes, the voltage compensation and balancing unit obtains the feedback voltage at the end of the line through each input sampling circuit, compares it with the reference voltage, and then the microprocessor outputs a control signal, i.e., a voltage regulation command, to control the corresponding electronic circuit in the voltage regulation circuit, causing the compensation circuit to generate compensation voltages of different polarities and magnitudes, thereby achieving the purpose of correcting the output voltage. Simultaneously, the microprocessor also controls the protection circuit to generate corresponding actions.

[0056] The power isolation filter unit is used to prevent transient distortions caused by transients and surges, as well as to eliminate resonant waves, clean the power grid, and reduce energy consumption. The power factor compensation unit uses power factor compensation to reduce reactive power losses of inductive loads in long-distance low-voltage power distribution control systems. The terminal data feedback unit is used to feed back real-time power data from the terminal to the central main control system, which uses a built-in intelligent control system to achieve closed-loop regulation of the loop voltage, realizing automatic and intelligent operation.

[0057] Therefore, by using intelligent relay power supplies, any intelligent relay power supply in a long-distance low-voltage power distribution control system can obtain its own first voltage detection data without the need for external detection equipment or manual observation meters, and can automatically process and control the signal.

[0058] Step S12: Obtain the first numerical relationship between the first voltage detection value and the preset first reference voltage range.

[0059] The preset first reference voltage range is the voltage range during which the current intelligent relay power supply operates normally. The upper and lower limits of each reference voltage range can fluctuate within a fixed threshold range; that is, the reference voltage range for each intelligent relay power supply can be set to the same or different operating voltage ranges according to the actual application scenario. The intelligent relay power supply can operate normally when the voltage value at its input terminal is within this reference voltage range. In long-distance low-voltage power distribution control systems, the loop current increases accordingly as the terminal voltage decreases. Therefore, maintaining the terminal voltage near the rated voltage value prevents device damage and reduces additional losses.

[0060] Step S13: If the first voltage detection value exceeds the first reference voltage range, based on the first numerical relationship, a voltage adjustment command is sent to the front-end intelligent relay power supply so that the front-end intelligent relay power supply adjusts the voltage value delivered to the current intelligent relay power supply according to the voltage adjustment command.

[0061] Specifically, when the first voltage detection value exceeds the first reference voltage range—that is, when the first voltage detection value is lower than the lower limit of the first reference voltage range or higher than the upper limit of the first reference voltage range—the current intelligent relay power supply automatically detects the above numerical relationship, determines its own voltage value, and further sends a voltage adjustment command to its upstream intelligent relay power supply. The processor outputs a control signal to control the corresponding intelligent relay power supply in the long-distance low-voltage power distribution control system, restoring it to a normal and stable working state. This achieves the purpose of correcting and compensating the input voltage of each part of the output, thereby stabilizing the entire long-distance low-voltage power distribution control system.

[0062] The voltage regulation command includes the voltage value required for the current input voltage of the smart relay power supply to reach the first reference voltage range.

[0063] Optionally, the voltage regulation command can also include the first reference voltage range and the first detection value of the current smart relay power supply, or the reference voltage range and detection voltage value of the subsequent smart relay power supply. By adding multiple information commands and increasing the comparison reference, the front-end smart relay power supply can more accurately determine the status of the current smart relay power supply, thereby ensuring that the current smart relay power supply is in a normal and stable working state.

[0064] Optionally, the intelligent relay power supply in this application has built-in RS485, RS232, and RJ45 communication interfaces, and can be connected to the monitoring center through an optical fiber or wireless communication network to receive remote monitoring of various power data from the monitoring center, thereby realizing remote control and voltage regulation of the intelligent relay power supply.

[0065] Specifically, the first voltage detection value can be the input voltage value of the load connected to the current smart relay power supply, and the first reference voltage range is the operating voltage range of the load. When the load's input voltage value is lower than the operating voltage range, the load sends a command to the current smart relay power supply, which adjusts the voltage value transmitted to the load to adjust the load's input voltage value. If the adjusted load's input voltage value still cannot reach the operating voltage range, the current smart relay power supply sends a voltage adjustment command to the preceding relay power supply to ensure that the load's input voltage value is within the operating voltage range, allowing the load to operate normally.

[0066] For example, the operating voltage range of the load is 380V±3%. If the input voltage of the load after adjustment by the current smart relay power supply is still lower than 380V±3%, then the current smart relay power supply needs to send a voltage adjustment command to the previous smart relay power supply.

[0067] In addition, to ensure that the voltage across the wires and cables is not excessive when the upstream intelligent repeater transmits voltage to the current intelligent repeater, and to prevent safety hazards caused by insulation damage, it is necessary to limit the output voltage of the upstream intelligent repeater. For example, the output voltage of the upstream intelligent repeater can be limited to ≤660V.

[0068] In this embodiment of the long-distance low-voltage power distribution control system, intelligent relay power supplies are used as independent power distribution units in multi-chain power distribution trunk lines. Each intelligent relay power supply can act as a master controller to send commands or as a slave controller to receive commands. Therefore, the long-distance low-voltage power distribution control system of this application achieves independent automatic control. Furthermore, the intelligent relay power supply can automatically detect its own voltage and feed back the voltage difference between itself and the preset first reference voltage range to the preceding intelligent relay power supply. Simultaneously, the preceding intelligent relay power supply automatically responds to the corresponding voltage regulation command to adjust the trunk line output voltage. Through the above method, real-time automatic adjustment of the voltage on the multi-chain low-voltage power distribution trunk line can be achieved throughout the entire process. In addition, one characteristic of low voltage is that the voltage drops rapidly during long-distance transmission. As the input voltage of the current intelligent relay power supply decreases, the loop current between the current intelligent relay power supply and the preceding intelligent relay power supply will increase accordingly. The loss in the transmission line is proportional to the square of the current. Therefore, maintaining the voltage of the current intelligent relay power supply within the first reference voltage range can effectively reduce the power loss on the transmission line between the current intelligent relay power supply and the preceding intelligent relay power supply, prevent device damage, and reduce costs.

[0069] For other embodiments, please refer to the details. Figure 2 , Figure 2 yes Figure 1 The diagram shows a long-distance low-voltage power distribution control system based on multi-closed-loop control technology in the long-distance low-voltage power distribution control method shown. In this method, all intelligent relay power supplies in the transmission line along its transmission direction form a first closed-loop circuit. Each intelligent relay power supply can realize the long-distance low-voltage power distribution control method of this application embodiment.

[0070] Specifically, the long-distance low-voltage power distribution control system includes multiple intelligent relay power supplies connected in series on the main line. Each intelligent relay power supply can be connected to several loads. For each current intelligent relay power supply, the preceding intelligent relay power supply can respond to instructions to compensate, boost, and balance the voltage of the corresponding following intelligent relay power supply, thereby achieving the goal of stable operation of the entire long-distance low-voltage power distribution control system.

[0071] Optionally, the voltage at the load terminals may fluctuate within a range, for example, in long-distance low-voltage power distribution, the voltage value may be within the range of 380V ± 3% for normal operation.

[0072] For example, in a long-distance low-voltage power distribution control system, after any intelligent relay power source sends a voltage regulation command, its upstream intelligent relay power source responds. If the upstream intelligent relay power source cannot adjust the input voltage of the current intelligent relay power source to the first reference range through the voltage regulation command, the upstream intelligent relay power source continues to send a voltage regulation command to its preceding intelligent relay power source until all upstream intelligent relay power sources respond to the voltage regulation command and adjust the trunk output voltage, ultimately ensuring that the input voltage value of the current intelligent relay power source meets the requirements. Furthermore, the current intelligent relay power source can respond to the voltage regulation command of the downstream intelligent relay power source, adjusting the trunk output voltage of the current intelligent relay power source, thereby ensuring that the input voltage value of the downstream intelligent relay power source is within the reference voltage range, guaranteeing its stable operation. This continues until the input voltage values ​​of all intelligent relay power sources in the entire long-distance low-voltage power distribution control system are within their respective reference voltage ranges; at this point, the entire long-distance low-voltage power distribution control system is also in a stable operating state.

[0073] Optionally, in long-distance low-voltage distribution fields, the load can be an exhaust fan, water pump, distribution box, lighting box, etc.

[0074] Optionally, the distance between each smart relay power source is determined based on the actual application scenario.

[0075] Optionally, the intelligent relay power supply in the long-distance low-voltage power distribution control system can adopt multi-channel power acquisition, including total power accumulation such as voltage, current, reactive power, and power factor, which can be displayed locally or displayed by the monitoring center through the internal network.

[0076] In existing technologies, conventional power distribution solutions for long-distance low-voltage power distribution involve either bringing high-voltage electricity to the target location, constructing a substation there to convert it to low-voltage power, or increasing the cross-section of the low-voltage transmission cable several times over to ensure the voltage requirements of the equipment at the target location are met. However, in certain special locations, such as underground subway tunnels, constructing substations or using enlarged cable cross-sections (due to high power consumption and long supply distances) can significantly increase project costs.

[0077] In this embodiment, during long-distance low-voltage power distribution, the long-distance low-voltage power distribution control system divides the long line into preset nodes according to the actual application scenario, and sets up an independently operating intelligent relay power supply at each node. The number of intelligent relay power supplies can be increased or decreased according to the actual line length to achieve long-distance voltage transmission. In addition, the system automatically detects and responds to commands to adjust the input voltage of the intelligent relay power supply to its corresponding reference voltage range, so that each intelligent relay power supply is in a stable working state and prevents damage to electrical components caused by excessively high or low voltage.

[0078] Based on the long-distance low-voltage power distribution control method described in the above embodiments, another long-distance low-voltage power distribution control method is proposed for adjusting the operating voltage on the wires and cables between two intelligent relay power sources. Please refer to [link / reference needed] for details. Figure 3 , Figure 3 This is a flowchart illustrating the second embodiment of the long-distance low-voltage power distribution control method based on multi-closed-loop control technology provided in this application.

[0079] like Figure 3 As shown, based on the first numerical relationship, the step of sending a voltage regulation command to the forward intelligent relay power supply further includes:

[0080] Step S131: Based on the first numerical relationship, obtain the fourth reference voltage range of the front-end intelligent relay power supply, as well as the wire and cable information between the front-end intelligent relay power supply and the front-end intelligent relay power supply.

[0081] The fourth reference voltage range is the reference voltage range when the front-end intelligent relay power supply is in normal working condition.

[0082] Specifically, the information on wires and cables includes their length, cross-sectional area, and material. Using this information, the front-end intelligent relay power supply can effectively identify the resistance of the wires and cables, thereby calculating the impact of voltage changes during transmission on the current flowing through the wires and cables. By monitoring and limiting the current value on the wires and cables, it prevents excessive current from causing high losses, thus achieving precise power delivery for specific application scenarios and preventing energy loss caused by excessively low voltage in the wires and cables.

[0083] Step S132: Generate a voltage regulation command according to the first numerical relationship, the fourth reference voltage range, and the wire and cable information.

[0084] In this embodiment, the voltage regulation command ensures that the voltage at the input of the current intelligent relay power supply is within the reference voltage range, i.e., in a stable operating state, thanks to the long-distance low-voltage power distribution control system. Furthermore, since the voltage regulation command also references the third reference voltage range of the preceding intelligent relay power supply, the voltage at the input of the current intelligent relay power supply remains within the reference voltage range, also indicating stable operation, after compensation by the preceding intelligent relay power supply. In addition, the voltage regulation command can also adjust the voltage of the cables between the two intelligent relay power supplies, ensuring that the transmission current of the cables is at the minimum current required for normal operation. Through these methods, losses are further reduced, and energy conversion efficiency is improved.

[0085] Step S133: Send a voltage regulation command to the forward intelligent relay power supply.

[0086] In the embodiments of this application, precise voltage regulation is achieved by identifying wire and cable information and adjusting the voltage based on its reference voltage, thus preventing excessive additional losses and line damage. Since the loss of wires and cables is proportional to the square of the current, keeping the transmission current of wires and cables at a low value can effectively reduce power loss on transmission lines and improve power conversion efficiency.

[0087] In other embodiments, acquiring voltage detection data may further include the voltage value at the load input terminal connected to the smart relay power supply; for details, please refer to [link to relevant documentation]. Figure 4 , Figure 4 This is a flowchart illustrating the third embodiment of the long-distance low-voltage power distribution control method based on multi-closed-loop control technology provided in this application.

[0088] like Figure 4 As shown, the steps for obtaining voltage detection data also include:

[0089] Step S21: Obtain the second voltage detection value of the load located at the current smart relay power supply.

[0090] The second voltage detection value is the voltage detection value at the load input terminal when the external load of the current smart relay power supply is in working state. The process of acquiring and feeding back this voltage detection value is completed by the corresponding current smart relay power supply connected to the load.

[0091] Step S22: Obtain the second numerical relationship between the second voltage detection value and the operating voltage range of the load.

[0092] The preset second reference voltage range is the voltage range when the load on the current smart relay power supply is working normally. The upper and lower limits of each reference voltage range can fluctuate within a fixed threshold range. That is, the reference voltage range of the load on each smart relay power supply can be set to the same or different working voltage ranges according to different types or numbers of external loads.

[0093] Step S23: If the second voltage detection value exceeds the operating voltage range, based on the second numerical relationship, a second voltage regulation command is sent to the front-end intelligent relay power supply so that the front-end intelligent relay power supply adjusts the voltage value delivered to the current intelligent relay power supply and the load according to the second voltage regulation command.

[0094] Among them, the current intelligent relay power supply and its external load form a second closed loop.

[0095] Specifically, the second closed-loop circuit is a sub-circuit of the first closed-loop circuit. The voltage regulation process of the second closed-loop circuit and the voltage regulation process of the first closed-loop circuit can be carried out synchronously or asynchronously, thereby realizing a dual closed-loop circuit to improve the fault tolerance and stability of the long-distance low-voltage power distribution control system.

[0096] For example, if the current intelligent relay power supply detects that the voltage at its load input terminal is not within the second detection voltage range, and if its own reference voltage range can provide sufficient voltage to respond to the voltage regulation command to compensate for the voltage value required for the load to return to normal operation, then the load input voltage is adjusted, the second closed-loop circuit is completed, and the entire long-distance low-voltage power distribution control system is in normal operation. If, after the compensation voltage, the current intelligent relay power supply detects that the first detection voltage value is not within the first reference voltage range, or detects that its own input voltage is insufficient for the load to operate normally, then the current intelligent relay power supply continues to send a voltage regulation command to the preceding intelligent relay power supply, which continues to regulate its own voltage. This process is repeated until a suitable preceding intelligent relay power supply can respond to the voltage regulation command and adjust the voltage value at the input terminal of the current intelligent relay power supply. At this point, the first closed-loop circuit is completed, and the entire long-distance low-voltage power distribution control system is in normal operation.

[0097] In this embodiment, the long-distance low-voltage power distribution system regulates the voltage of equipment on the same sub-circuit. Combined with the feedback voltage regulation of the long-distance low-voltage power distribution control system in the previous embodiment, a double-closed-loop feedback voltage regulation mode is realized, completing the joint control and coordination of intelligent relay power supplies. When the voltage of any intelligent relay power supply fluctuates, other intelligent relay power supplies respond and adjust to it, enhancing the stability and controllability of the entire long-distance low-voltage power distribution control system.

[0098] In other embodiments, besides the front-end intelligent relay power supply adjusting the voltage of the current intelligent relay power supply in response to a voltage regulation command, the current intelligent relay power supply can also respond to a voltage regulation command from the rear intelligent relay power supply, adjusting the output voltage of the current relay power supply trunk line to adjust the voltage at the input terminal of the rear intelligent relay power supply. For details, please refer to [link to specific procedures]. Figure 5 , Figure 5 This is a flowchart illustrating the fourth embodiment of the long-distance low-voltage power distribution control method based on multi-closed-loop control technology provided in this application.

[0099] like Figure 5 As shown, the long-distance low-voltage power distribution control method provided in this application also includes:

[0100] Step S31: Detect the status of the rear intelligent relay power supply.

[0101] Specifically, the current intelligent relay power supply performs status detection on the downstream intelligent relay power supply and obtains relevant status information of the downstream intelligent relay power supply. This status information includes data such as the input voltage and current of the downstream intelligent relay power supply, as well as whether it is in normal working condition. The current intelligent relay power supply can detect the status of the downstream intelligent relay power supply and adjust the voltage or issue a maintenance warning in a timely manner when it is abnormal.

[0102] Step S32: When the state of the rear intelligent relay power supply is in an abnormal working state, obtain the third voltage detection value of the rear intelligent relay power supply.

[0103] Optionally, the causes of abnormal working conditions include short circuits, open circuits, or damage to the components of the intelligent relay power supply itself. The intelligent relay power supply is equipped with corresponding built-in program templates to determine the cause of its abnormal working condition, such as overload, overvoltage, undervoltage, short circuit, phase loss, phase sequence, overtemperature, etc., and preset corresponding instructions for adjustment. In this way, the working status of the downstream intelligent relay power supply can be detected in time, and the voltage can be adjusted in time to prevent damage to the electrical components caused by the electrical components not being in the reference voltage range for a long time.

[0104] Step S33: Based on the third voltage detection value and the third reference voltage range of the downstream intelligent relay power supply, adjust the voltage value supplied to the downstream intelligent relay power supply.

[0105] In this embodiment, the current intelligent relay power supply automatically detects voltage fluctuations, i.e., a sudden lack of electrical components in the long-distance low-voltage power distribution control system. At this time, the voltage allocated to the input terminal of the current intelligent relay power supply changes abruptly, resulting in transients and surges. Transients and surges in the long-distance low-voltage power distribution control system are a kind of instantaneous distortion on a sinusoidal alternating wave, which is very harmful to microelectronic devices. Through the above method, the intelligent relay power supply can suppress most of the transients and surges in the long-distance low-voltage power distribution control system, eliminate resonant waves, clean the power grid, reduce energy consumption, and provide multiple protections.

[0106] Specifically, when the current intelligent relay power supply learns that the real-time voltage detection value of the downstream intelligent relay power supply is not within the third reference voltage range, it automatically adjusts the voltage value supplied to the downstream intelligent relay power supply so that the real-time voltage of the downstream intelligent relay power supply returns to the third reference voltage range.

[0107] Based on the long-distance low-voltage power distribution control method of the above embodiments, this application also proposes a long-distance low-voltage power distribution control method when the third voltage detection value is 0. In this embodiment, a second voltage detection value is obtained based on the above-mentioned third voltage detection value being 0.

[0108] Furthermore, if the second voltage detection value is greater than the first reference voltage range, a third voltage regulation command is sent to the front-end intelligent relay power supply so that the front-end intelligent relay power supply adjusts the voltage value delivered to the current intelligent relay power supply according to the third voltage regulation command.

[0109] By detecting abnormal conditions through the above methods, the intelligent relay power supply can suppress transients and surges in long-distance low-voltage power distribution systems, eliminate resonant waves, clean the power grid, reduce energy consumption, and provide multiple protections.

[0110] To implement the long-distance low-voltage power distribution control method in all the above embodiments, this application also provides a long-distance low-voltage power distribution control system. Please refer to [link / reference]. Figure 6 , Figure 6 This is a schematic diagram of the framework of an embodiment of a long-distance low-voltage power distribution control system based on multi-closed-loop control technology provided in this application.

[0111] like Figure 6 As shown, the long-distance low-voltage power distribution control system includes: a substation 10, an intelligent relay power supply 20, a load 21, and several wires and cables 30.

[0112] Among them, there are several intelligent relay power supplies 20 connected in series, one of which is connected to the substation power supply 10 so that the substation 10 provides power to the several intelligent relay power supplies 20.

[0113] Each wire and cable 30 is used to connect two intelligent relay power supplies 20 or intelligent relay power supply 20 and its load 21 to the substation 10.

[0114] The actual application scenario determines the number and installation location of the intelligent relay power supply 20.

[0115] To implement the long-distance low-voltage power distribution control method in all the above embodiments, this application also provides a long-distance low-voltage power distribution control device 500, for details please refer to Figure 7 , Figure 7 This is a schematic diagram of a framework of an embodiment of the long-distance low-voltage power distribution control device based on multi-closed-loop control technology provided in this application. The long-distance low-voltage power distribution control device 500 of this application embodiment includes a processor 51, a memory 52, an input / output device 53, and a bus 54.

[0116] The processor 51, memory 52, and input / output device 53 are respectively connected to the bus 54. The memory 52 stores program data, and the processor 51 is used to execute the program data to implement the long-distance low-voltage power distribution control method based on multi-closed-loop control technology described in the above embodiment.

[0117] In this embodiment, processor 51 can also be referred to as a CPU (Central Processing Unit). Processor 51 may be an integrated circuit chip with signal processing capabilities. Processor 51 can also be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. The general-purpose processor can be a microprocessor, or processor 51 can be any conventional processor.

[0118] This application also provides a computer storage medium; please refer to the following: Figure 8 , Figure 8 This is a schematic diagram of a computer storage medium according to an embodiment of the present application. The computer storage medium 600 stores program data 61, which, when executed by a processor, is used to implement a long-distance low-voltage power distribution control method based on multi-closed-loop control technology as described in the above embodiment.

[0119] When the embodiments of this application are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0120] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A long-distance low-voltage power distribution control method based on multi-closed-loop control technology, characterized in that, The method is applied to intelligent relay power supplies in long-distance low-voltage power distribution control systems. The system includes multiple intelligent relay power supplies connected in series along the transmission trunk line. Each intelligent relay power supply has a built-in voltage compensation and boosting balancing unit and a power isolation and filtering unit. The voltage compensation and boosting balancing unit includes an input sampling circuit, a compensation circuit, and a voltage regulation circuit. Each intelligent relay power supply includes a first port, a second port, and a third port. The first port is an input port, the second port is a trunk line output port, and the third port is a load output port. For each of the multiple intelligent relay power supplies connected in series along the power transmission trunk line, it can be used as the current intelligent relay power supply. Any one or more intelligent relay power supplies located upstream of the transmission along the voltage transmission direction are the front intelligent relay power supplies, and any one or more intelligent relay power supplies located downstream of the transmission along the voltage transmission direction are the rear intelligent relay power supplies. When it serves as the current intelligent relay power source, the long-distance low-voltage power distribution control method is executed by the microprocessor of the current intelligent relay power source, and the method includes: Obtain the first voltage detection value of the current intelligent relay power supply; Obtain a first numerical relationship between the first voltage detection value and a preset first reference voltage range, wherein the first reference voltage range is the voltage range when the current smart relay power supply is working normally; When the first voltage detection value exceeds the first reference voltage range, the fourth reference voltage range of the front-end intelligent relay power supply and the wire and cable information between the front-end intelligent relay power supply are obtained. The fourth reference voltage range is the reference voltage range when the front-end intelligent relay power supply is in normal working condition. The wire and cable information is used to determine the resistance information of the wire and cable. Based on the first numerical relationship, the fourth reference voltage range, and the wire and cable information, determine the voltage value required for the current intelligent relay power supply to reach the first reference voltage range. A voltage adjustment command is sent to the forward intelligent relay power supply so that the forward intelligent relay power supply adjusts the voltage value delivered to the current intelligent relay power supply according to the voltage adjustment command; wherein, the voltage adjustment command is used to control the corresponding electronic circuit in the voltage adjustment circuit so that the compensation circuit generates compensation voltages of different polarities and magnitudes.

2. The long-distance low-voltage power distribution control method according to claim 1, characterized in that, The long-distance low-voltage power distribution control method also includes: Obtain the second voltage detection value of the load located at the current smart relay power supply; Obtain a second numerical relationship between the second voltage detection value and the operating voltage range of the load; If the second voltage detection value exceeds the operating voltage range, a second voltage regulation command is sent to the front-end intelligent relay power supply based on the second numerical relationship, so that the front-end intelligent relay power supply adjusts the voltage value delivered to the current intelligent relay power supply and the load according to the second voltage regulation command.

3. The long-distance low-voltage power distribution control method according to claim 1, characterized in that, The long-distance low-voltage power distribution control method also includes: Detect the status of the rear intelligent relay power supply; When the state of the rear intelligent relay power supply is abnormal, the third voltage detection value of the rear intelligent relay power supply is obtained. Based on the third voltage detection value and the third reference voltage range of the rear intelligent relay power supply, the voltage value supplied to the rear intelligent relay power supply is adjusted.

4. The long-distance low-voltage power distribution control method according to claim 3, characterized in that, After obtaining the third voltage detection value of the rear intelligent relay power supply, the long-distance low-voltage power distribution control method further includes: When the third voltage detection value is 0, the second voltage detection value of itself is obtained; If the second voltage detection value exceeds the first reference voltage range, a third voltage regulation command is sent to the front-end intelligent relay power supply so that the front-end intelligent relay power supply adjusts the voltage value delivered to the current intelligent relay power supply according to the third voltage regulation command.

5. A long-distance low-voltage power distribution control system based on multi-closed-loop control technology, characterized in that, The long-distance low-voltage power distribution control system includes: Substation; A plurality of intelligent relay power supplies are connected in series, wherein one of the intelligent relay power supplies is electrically connected to the substation so that the substation provides power to the plurality of intelligent relay power supplies; Each of the intelligent relay power supplies is voltage controlled by the long-distance low-voltage power distribution control method as described in any one of claims 1-4.

6. The long-distance low-voltage power distribution control system according to claim 5, characterized in that, The long-distance low-voltage power distribution control system also includes several wires and cables, each of which is used to connect two intelligent relay power sources or intelligent relay power sources and their loads or intelligent relay power sources and the substation.

7. A long-distance low-voltage power distribution control device, characterized in that, The long-distance low-voltage power distribution control device includes a processor and a memory connected to the processor, wherein... The memory stores program instructions; The processor is used to execute the program instructions stored in the memory to implement the long-distance low-voltage power distribution control method as described in any one of claims 1 to 4.

8. A computer-readable storage medium, characterized in that, The storage medium stores program instructions, which, when executed, implement the long-distance low-voltage power distribution control method as described in any one of claims 1 to 4.

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