A loss reduction method for AC / DC flexible interconnection system based on power scanning

Abstract

The present invention provides a loss reduction method for an AC / DC flexible interconnection system based on power scanning, which relates to the technical field of electric power engineering. The method includes initializing the AC / DC flexible interconnection system; reading the status information of the AC / DC flexible interconnection system; judging whether the AC / DC flexible interconnection system is in normal working condition according to the status information; collecting power information at various locations in the system, calculating the system efficiency according to the collected power information, and obtaining a power dispatch transmission value Pco1 that minimizes the system operation loss, recorded as Pco1*, as an output power instruction of the flexible interconnection device on the power control side, so that the flexible interconnection device on the power control side works according to this output power, and recording the Pco1* together with the equivalent total load value of the current two substations in a database; judging whether the equivalent total load value of the two substations at the next moment is a situation that has occurred. The present invention simplifies the loss reduction process and improves the accuracy of the loss reduction results.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power engineering, and in particular to a loss reduction method for an AC / DC flexible interconnection system based on power scanning. Background Art

[0002] With the continuous access of new loads with high power and strong random characteristics, such as electric vehicles, in the low-voltage distribution network, and the continuous increase in the proportion of distributed power sources, the power imbalance between distribution areas has become increasingly prominent, and the transformers in the distribution areas are facing the risk of power exceeding the limit. Although the traditional transformer expansion and upgrading method can meet the higher power load demand, it is costly and often leads to capacity redundancy and low economic efficiency. Therefore, seeking a more efficient and economical solution has become an important topic in the current power system research.

[0003] As an emerging technical means, flexible interconnection technology of substations provides a new idea for solving the problem of power imbalance between substations. This technology uses a flexible interconnection device based on the AC / DC conversion link to interconnect different substations in the form of DC to build a controllable power transmission bridge. This method can not only achieve power mutual assistance between substations and improve capacity utilization, but also effectively cope with the challenges brought by the access of high-power loads such as electric vehicles.

[0004] However, the implementation of flexible interconnection technology is not smooth sailing. Among them, how to determine the power scheduling transmission value between stations is a key issue. Although the traditional economic optimization algorithm can find the optimal solution for the objective function, the algorithm is highly complex and takes a long time to solve. In addition, due to the error between the objective function and the actual system, the resulting scheduling instruction results may deviate from the ideal situation. Therefore, how to accurately and efficiently determine the power scheduling transmission value has become an important issue that needs to be solved in the practical application of flexible interconnection technology. Summary of the invention

[0005] To this end, an embodiment of the present invention provides a loss reduction method for an AC / DC flexible interconnection system based on power scanning, which is used to solve the problems of power imbalance between stations and low operating efficiency of the AC / DC flexible interconnection system in the prior art.

[0006] In order to solve the above problems, an embodiment of the present invention provides a loss reduction method for an AC / DC flexible interconnection system based on power scanning, the method comprising:

[0007] Step S1: Initializing the AC / DC flexible interconnection system, wherein the AC / DC flexible interconnection system is composed of a distribution cloud master station and two substations, wherein the substation includes a substation distribution transformer, an equivalent total load, a flexible interconnection device, and a substation fusion terminal, wherein the flexible interconnection devices between the substations are connected via a DC bus, and the substation fusion terminal is used to receive power information within the substation;

[0008] Step S2: reading the status information of the AC / DC flexible interconnection system;

[0009] Step S3: judging whether the AC / DC flexible interconnection system is in normal working condition according to the state information; if so, starting and maintaining the system operation loss minimum mode; if not, clearing the fault in the system, and returning to execute step S2, wherein when the AC / DC flexible interconnection system is in normal working condition, the two flexible interconnection devices respectively operate in constant voltage mode and constant power mode, and the flexible interconnection device operating in constant voltage mode is called a flexible interconnection device on the voltage control side, and the flexible interconnection device operating in constant power mode is called a flexible interconnection device on the power control side;

[0010] Step S4: Collect power information at various locations in the system, calculate the system efficiency η based on the collected power information, and obtain the power scheduling transmission value Pco1 that minimizes the system operation loss, recorded as Pco1*, as the output power instruction of the flexible interconnection device on the power control side, so that the flexible interconnection device on the power control side works according to this output power, and record Pco1* together with the equivalent total load value of the current two substations in the database;

[0011] Step S5: Determine whether the equivalent total load value of the two substations at the next moment is the same as that which has occurred before, that is, whether it is the same as the data in the database. If so, directly read Pco1* in this case from the database as the output power instruction of the flexible interconnection device on the power control side, so that the flexible interconnection device on the power control side works according to this output power. If not, execute step S4.

[0012] Preferably, the method for initializing the AC / DC flexible interconnection system is:

[0013] In the AC / DC flexible interconnection system, the flexible interconnection devices between substations are connected through a DC bus. The flexible interconnection device at one end is first started in constant voltage mode to establish the DC bus voltage; then the flexible interconnection device at the other end is started in constant power / constant current mode, so that the entire AC / DC flexible interconnection system starts to a stable operating state.

[0014] Preferably, the condition for the AC / DC flexible interconnection system to be in normal working condition is:

[0015] The AC and DC side voltages of the flexible interconnection device are both within the allowable range near the rated voltage, and the AC and DC output currents are both within the rated current.

[0016] Preferably, the flexible interconnection device on the power control side operates in a scanning mode in which the output power increases linearly from 0 to the rated power.

[0017] Preferably, the collected power information includes:

[0018] The power Pl1 and Pl2 output by the substation distribution transformer to the equivalent total load within the substation power supply range, the power Pci1 and Pci2 output by the substation distribution transformer to the flexible interconnection device, and the power P1 and P2 output by the upper-level power grid to the substation distribution transformer.

[0019] Preferably, the system efficiency η is calculated according to the collected power information to obtain the power scheduling transmission value Pco1 that minimizes the system operation loss, recorded as Pco1*, which specifically includes:

[0020] First, the system efficiency η is calculated based on the collected power information:

[0021] η=(Pl1+Pl2) / (P1(Pco1)+P2(Pco1))

[0022] Where, Pl1 and Pl2 are the power output of the distribution transformer in the substation to the equivalent total load within the power supply range of the substation; P1(Pco1) and P2(Pco1) are the power output of the upper power grid to the distribution transformer in the substation when the power output of the flexible interconnection device on the power control side is Pco1;

[0023] Then the maximum system efficiency η is defined as the lowest operating loss of the AC / DC flexible interconnection system, and the power scheduling transmission value Pco1 that minimizes the system operating loss is obtained, which is recorded as Pco1*.

[0024] Preferably, the method for calculating the system efficiency η according to the collected power information is:

[0025] By controlling the flexible interconnection device on the central control power side of the AC / DC interconnection system to operate in a scanning mode in which the output power increases linearly from 0 to the rated power, the system efficiency η under different power transfer values ​​can be actually calculated.

[0026] Preferably, the communication conditions and computing power of the substation fusion terminal are used to decide whether to calculate the system efficiency η in the substation fusion terminal or the distribution cloud master station, and whether to set up the database in the substation fusion terminal or the distribution cloud master station. If the substation fusion terminals have edge-to-edge communication and transmission functions and sufficient computing power, the system efficiency η is calculated in the substation fusion terminal and the database is set up, otherwise the opposite is true.

[0027] An embodiment of the present invention also provides an electronic device, which includes a processor, a memory and a bus system, wherein the processor and the memory are connected through the bus system, the memory is used to store instructions, and the processor is used to execute the instructions stored in the memory to implement the above-mentioned AC / DC flexible interconnection system loss reduction method based on power scanning.

[0028] An embodiment of the present invention further provides a computer storage medium storing a computer software product. The computer software product includes several instructions for enabling a computer device to execute the above-mentioned AC / DC flexible interconnection system loss reduction method based on power scanning.

[0029] It can be seen from the above technical solutions that the present invention has the following beneficial effects:

[0030] (1) The present invention ingeniously enables the flexible interconnection device on the power control side to output in a scanning mode from 0 to rated power, and only conventional acquisition and simple algorithms can be used to conveniently measure and calculate the changes in system efficiency during the entire power scanning process. The power scheduling transmission value that minimizes the system operation loss is obtained by observation. In addition, by storing it in a database for direct call under the same load condition, repeated scanning calculations are avoided, thereby greatly reducing the system operation loss and reducing the need for complex optimization algorithms.

[0031] (2) The present invention avoids the difference between the optimization target modeling and the actual system. All data in the present invention comes from real-time data collection of the real system. Through actual experiments, we can directly obtain the power scheduling transmission value that can make the system work at the lowest operating loss point. This method avoids the result deviation caused by the error between the optimization target function modeling and the system, thereby significantly improving the accuracy of the loss reduction results of the flexible interconnection system. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the implementation cases of the present invention or the technical solutions in the prior art, the following is a brief description of the drawings required for use in the embodiments. By referring to the drawings, the features and advantages of the present invention will be more clearly understood. The drawings are schematic and should not be understood as limiting the present invention in any way. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0033] Figure 1 It is a flow chart of a loss reduction method of an AC / DC flexible interconnection system based on power scanning provided in an embodiment;

[0034] Figure 2 A primary circuit and communication link diagram of the AC / DC flexible interconnection system in the embodiment;

[0035] Figure 3 It is a power curve when the flexible interconnection device on the power control side of the embodiment works in the output power scanning mode. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Embodiment 1

[0038] In order to solve the problems of power imbalance between stations and low operating efficiency of AC / DC flexible interconnection systems in the existing technology, Figure 1 As shown, an embodiment of the present invention proposes a loss reduction method for an AC / DC flexible interconnection system based on power scanning, the method comprising:

[0039] Step S1: Initializing the AC / DC flexible interconnection system, wherein the AC / DC flexible interconnection system is composed of a distribution cloud master station and two substations, wherein the substation includes a substation distribution transformer, an equivalent total load, a flexible interconnection device, and a substation fusion terminal, wherein the flexible interconnection devices between the substations are connected via a DC bus, and the substation fusion terminal is used to receive power information within the substation;

[0040] Step S2: reading the status information of the AC / DC flexible interconnection system;

[0041] Step S3: judging whether the AC / DC flexible interconnection system is in normal working condition according to the state information; if so, starting and maintaining the system operation loss minimum mode; if not, clearing the fault in the system, and returning to execute step S2, wherein when the AC / DC flexible interconnection system is in normal working condition, the two flexible interconnection devices respectively operate in constant voltage mode and constant power mode, and the flexible interconnection device operating in constant voltage mode is called a flexible interconnection device on the voltage control side, and the flexible interconnection device operating in constant power mode is called a flexible interconnection device on the power control side;

[0042] Step S4: Collect power information at various locations in the system, calculate the system efficiency η based on the collected power information, and obtain the power scheduling transmission value Pco1 that minimizes the system operation loss, recorded as Pco1*, as the output power instruction of the flexible interconnection device on the power control side, so that the flexible interconnection device on the power control side works according to this output power, and record Pco1* together with the equivalent total load value of the current two substations in the database;

[0043] Step S5: Determine whether the equivalent total load value of the two substations at the next moment is the same as that which has occurred before, that is, whether it is the same as the data in the database. If so, directly read Pco1* in this case from the database as the output power instruction of the flexible interconnection device on the power control side, so that the flexible interconnection device on the power control side works according to this output power. If not, execute step S4.

[0044] It can be seen from the above technical scheme that the present invention proposes a loss reduction method for an AC / DC flexible interconnection system based on power scanning. First, the flexible interconnection device on the power control side is cleverly output in a scanning mode from 0 to rated power. Only with the help of conventional acquisition and simple algorithms, the system can easily measure and calculate the changes in system efficiency during the entire power scanning process. The power scheduling transmission value that minimizes the system operation loss is obtained by observation. In addition, by storing it in a database for direct call under the same load condition, repeated scanning calculations are avoided, thereby greatly reducing the system operation loss and reducing the need for complex optimization algorithms. Secondly, the present invention avoids the difference between the optimization target modeling and the actual system. All data of the present invention come from real-time data acquisition of the real system. Through actual experiments, we can directly derive the power scheduling transmission value that can make the system work at the lowest point of operation loss. This method avoids the result deviation caused by the optimization objective function modeling and the error between the system, thereby significantly improving the accuracy of the loss reduction results of the flexible interconnection system.

[0045] like Figure 2 As shown in the figure, the AC / DC flexible interconnection system consists of a distribution cloud master station and two substations. Each substation includes a substation distribution transformer, an equivalent total load, a flexible interconnection device, and a substation fusion terminal. The flexible interconnection devices between substations are connected through a DC bus, and the substation fusion terminal receives the power information of each power collection point in the substation through a communication link. The power information includes the power Pl1 and Pl2 output by the substation distribution transformer to the equivalent total load within the power supply range of the substation, the power Pci1 and Pci2 output by the substation distribution transformer to the flexible interconnection device, and the power P1 and P2 output by the upper power grid to the substation distribution transformer. The distribution cloud master station and the substation fusion terminal are linked through a communication link.

[0046] In this embodiment, in step S1, the AC / DC flexible interconnection system is initialized, specifically including:

[0047] In the AC / DC flexible interconnection system, the flexible interconnection devices between stations are connected through a DC bus. If the voltage at both ends is controlled to be stable at a certain value, due to the difference in control accuracy, there will always be a higher voltage value at one end and a lower voltage value at the other end, which will generate a large circulating current, and then the system cannot operate stably. In order to avoid the above situation, the present invention first starts the DC bus voltage by starting the flexible interconnection device at one end in a constant voltage mode; then the flexible interconnection device at the other end is started in a constant power / constant current mode, so that the entire AC / DC flexible interconnection system starts to a stable operation state.

[0048] In this embodiment, in step S2, the state information of the AC / DC flexible interconnection system is read, including the AC / DC side voltages and the AC / DC outlet currents of the flexible interconnection device.

[0049] In this embodiment, in step S3, it is determined whether the AC / DC flexible interconnection system is in normal working condition according to the status information. If yes, the system operation loss minimum mode is started and maintained. If not, the fault in the system is cleared and the process returns to step S2. When the AC / DC flexible interconnection system is in normal working condition, the two flexible interconnection devices respectively operate in constant voltage mode and constant power mode. The flexible interconnection device operating in constant voltage mode is referred to as a flexible interconnection device on the voltage control side, and the flexible interconnection device operating in constant power mode is referred to as a flexible interconnection device on the power control side.

[0050] Furthermore, when there are fault-related indications in the system, the fault is cleared first according to the original fault handling means of the system; when the system is in or restored to normal working condition, the system operation loss minimum mode is started. Specifically, the start-up command can be issued by the distribution cloud master station or the fusion terminal. The decision on whether to issue the start-up command from the substation fusion terminal or the distribution cloud master station is based on the communication conditions and computing power of the substation fusion terminal.

[0051] Furthermore, the conditions for the AC / DC flexible interconnection system to be in normal working condition are:

[0052] The AC and DC side voltages of the flexible interconnection device are both within the allowable range near the rated voltage, and the AC and DC output currents are both within the rated current.

[0053] Furthermore, when the system is in the lowest operating loss mode, it can be considered that Pl1 and Pl2 are unchanged at a certain moment (within 1 second), and the output power instruction of the flexible interconnection device on the power control side increases linearly from 0 to the rated power during this time interval, such as Figure 3 As shown (where t2-t1<300ms), the flexible interconnection device on the power control side operates in a scanning mode in which the output power increases linearly from 0 to the rated power.

[0054] In this embodiment, in step S4, power information at various locations in the system is collected, and the system efficiency η is calculated based on the collected power information to obtain a power scheduling transmission value Pco1 that minimizes the system operation loss, recorded as Pco1*, which serves as an output power instruction for the flexible interconnection device on the power control side, so that the flexible interconnection device on the power control side works according to this output power, and the Pco1* is recorded in the database together with the equivalent total load value of the current two substations.

[0055] Furthermore, the collected power information is uploaded to the power distribution cloud master station via the cloud-to-terrain fusion terminal (or transmitted via edge-to-edge communication between cloud-to-terrain fusion terminals) to calculate the system efficiency η. In this embodiment, it is determined whether to calculate the system efficiency η in the substation fusion terminal or the power distribution cloud master station, and whether to set up the database in the substation fusion terminal or the power distribution cloud master station according to the communication conditions and computing power of the substation fusion terminal. If the substation fusion terminals have edge-to-edge communication and transmission functions and sufficient computing power, the system efficiency η is calculated in the substation fusion terminal and the database is set up, otherwise the opposite is true. It is preferred to calculate the system efficiency η and set up the database in the substation fusion terminal, so that the entire process does not need to go through the power distribution cloud master station.

[0056] Furthermore, the system efficiency η is calculated based on the collected power information to obtain the power scheduling transmission value Pco1 that minimizes the system operation loss, denoted as Pco1*, which specifically includes

[0057] First, the system efficiency η is calculated based on the collected power information:

[0058] η=(Pl1+Pl2) / (P1(Pco1)+P2(Pco1))

[0059] Wherein, Pl1 and Pl2 are the powers output by the distribution transformer in the substation to the equivalent total load within the power supply range of the substation; P1(Pco1) and P2(Pco1) are the powers output by the upper power grid to the distribution transformer in the substation when the power output of the flexible interconnection device on the power control side is Pco1.

[0060] Then the maximum system efficiency η is defined as the lowest operating loss of the AC / DC flexible interconnection system, and the power scheduling transmission value Pco1 that minimizes the system operating loss is obtained, which is recorded as Pco1*.

[0061] Furthermore, the method for calculating the system efficiency η according to the collected power information is:

[0062] By controlling the flexible interconnection device on the central control power side of the AC / DC interconnection system to operate in a scanning mode in which the output power increases linearly from 0 to the rated power, the system efficiency η under different power transfer values ​​can be actually calculated.

[0063] In this embodiment, in step S5, it is determined whether the equivalent total load values ​​(Pl1 and Pl2) of the two substations at the next moment are the same as those that have occurred before, that is, whether they are the same as the data in the database. If so, Pco1* in this case is directly read from the database as the output power instruction of the flexible interconnection device on the power control side, so that the flexible interconnection device on the power control side works according to this output power. If not, step S4 is executed.

[0064] Embodiment 2

[0065] An embodiment of the present invention also provides an electronic device, which includes a processor, a memory and a bus system, wherein the processor and the memory are connected through the bus system, the memory is used to store instructions, and the processor is used to execute the instructions stored in the memory to implement the above-mentioned AC / DC flexible interconnection system loss reduction method based on power scanning.

[0066] Embodiment 3

[0067] An embodiment of the present invention further provides a computer storage medium storing a computer software product. The computer software product includes several instructions for enabling a computer device to execute the above-mentioned AC / DC flexible interconnection system loss reduction method based on power scanning.

[0068] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0069] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0070] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide for implementing the process in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0071] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the invention.

Claims

1. A loss reduction method for an AC / DC flexible interconnection system based on power scanning, characterized in that: include: Step S1: Initializing the AC / DC flexible interconnection system, wherein the AC / DC flexible interconnection system is composed of a distribution cloud master station and two substations, wherein the substation includes a substation distribution transformer, an equivalent total load, a flexible interconnection device, and a substation fusion terminal, wherein the flexible interconnection device is connected via a DC bus, and the substation fusion terminal is used to receive power information within the substation; Step S2: reading the status information of the AC / DC flexible interconnection system; Step S3: judging whether the AC / DC flexible interconnection system is in normal working condition according to the state information; if so, starting and maintaining the system operation loss minimum mode; if not, clearing the fault in the system, and returning to execute step S2, wherein when the AC / DC flexible interconnection system is in normal working condition, the two flexible interconnection devices respectively operate in constant voltage mode and constant power mode, and the flexible interconnection device operating in constant voltage mode is called a flexible interconnection device on the voltage control side, and the flexible interconnection device operating in constant power mode is called a flexible interconnection device on the power control side; the flexible interconnection device on the power control side operates in a scanning mode in which the output power increases linearly from 0 to the rated power; Step S4: Collect power information at various locations in the system, calculate the system efficiency η based on the collected power information, and obtain the power scheduling transmission value Pco1 that minimizes the system operation loss, recorded as Pco1*, as the output power instruction of the flexible interconnection device on the power control side, so that the flexible interconnection device on the power control side works according to this output power, and record Pco1* together with the equivalent total load value of the current two substations in the database; The system efficiency η is calculated according to the collected power information to obtain the power scheduling transmission value Pco1 that minimizes the system operation loss, recorded as Pco1*, which specifically includes: First, the system efficiency η is calculated based on the collected power information: η=(Pl1+Pl2) / (P1(Pco1)+P2(Pco1)) Where, Pl1 and Pl2 are the power output of the distribution transformer in the substation to the equivalent total load within the power supply range of the substation; P1(Pco1) and P2(Pco1) are the power output of the upper power grid to the distribution transformer in the substation when the power output of the flexible interconnection device on the power control side is Pco1; Then the maximum system efficiency η is defined as the AC / DC flexible interconnection system with the lowest operating loss, and the power dispatch transmission value Pco1 that makes the system operating loss the lowest is obtained, which is recorded as Pco1*; Step S5: Determine whether the equivalent total load value of the two substations at the next moment is the same as that which has occurred before, that is, whether it is the same as the data in the database. If so, directly read Pco1* in this case from the database as the output power instruction of the flexible interconnection device on the power control side, so that the flexible interconnection device on the power control side works according to this output power. If not, execute step S4.

2. The AC / DC flexible interconnection system loss reduction method based on power scanning according to claim 1 is characterized in that: The method for initializing the AC / DC flexible interconnection system is: In the AC / DC flexible interconnection system, the flexible interconnection devices are connected through a DC bus. The flexible interconnection device at one end is first started in a constant voltage mode to establish the DC bus voltage; then the flexible interconnection device at the other end is started in a constant power / constant current mode, so that the entire AC / DC flexible interconnection system is started to a stable operation state.

3. The AC / DC flexible interconnection system loss reduction method based on power scanning according to claim 1 is characterized in that: The condition that the AC / DC flexible interconnection system is in normal working condition is: The AC and DC side voltages of the flexible interconnection device are both within the allowable range near the rated voltage, and the AC and DC output currents are both within the rated current.

4. The AC / DC flexible interconnection system loss reduction method based on power scanning according to claim 1 is characterized in that: The collected power information includes: The power Pl1 and Pl2 output by the substation distribution transformer to the equivalent total load within the substation power supply range, the power Pci1 and Pci2 output by the substation distribution transformer to the flexible interconnection device, and the power P1 and P2 output by the upper-level power grid to the substation distribution transformer.

5. The AC / DC flexible interconnection system loss reduction method based on power scanning according to claim 1 is characterized in that: Whether to calculate the system efficiency η in the substation fusion terminal or the distribution cloud master station, and whether to set up the database in the substation fusion terminal or the distribution cloud master station are determined according to the communication conditions and computing power of the substation fusion terminal. If the substation fusion terminals have edge-to-edge communication and transmission functions and sufficient computing power, the system efficiency η is calculated in the substation fusion terminal and the database is set up, otherwise the opposite is true.

6. An electronic device, characterized in that: The electronic device includes a processor, a memory and a bus system, the processor and the memory are connected through the bus system, the memory is used to store instructions, and the processor is used to execute the instructions stored in the memory to implement the AC / DC flexible interconnection system loss reduction method based on power scanning as described in any one of claims 1 to 5.

7. A computer storage medium, characterized in that: The computer storage medium stores a computer software product, and the computer software product includes a number of instructions for enabling a computer device to execute the AC / DC flexible interconnection system loss reduction method based on power scanning as described in any one of claims 1 to 5.

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