A method and device for detecting line loss of a distribution network based on a multi-stage transformer

Abstract

The present invention provides a method and device for detecting line losses in a distribution network based on a multi-stage transformer. The method includes: detecting the line losses of a first end line based on a first detection period; detecting the line losses of a second end line, a first-stage transformer, and a second-stage transformer based on a second detection period; the first detection period is greater than the second detection period; the first end line is an end branch line with a line loss rate less than or equal to a preset line loss rate, and the second end line is an end branch line with a line loss rate greater than the preset line loss rate. The method for detecting line losses in a distribution network provided by the present invention can improve the accuracy of line loss detection in the distribution network.

Description

Technical Field

[0001] The present invention relates to the technical field of smart grids, and specifically to a method and device for detecting distribution network line losses based on a multi-level transformer. Background Art

[0002] Distribution network line loss is the loss generated in the distribution network during the process of transmitting electric energy from the power plant to the users. As an important part of distribution network management, line loss detection can identify the root causes of line losses, and then take effective measures to reduce line losses and improve utilization efficiency. Therefore, line loss detection plays an important role in distribution network management work and is the key to ensuring the standardization and orderliness of the distribution network system. During the process of distribution network line loss detection, it is necessary to collect data such as line voltage, line current, transformer capacity, and load distribution of the distribution network. The large amount of data collection brings the burden of data transmission and data processing, and it is difficult to ensure the transmission accuracy. Summary of the Invention

[0003] Object of the Invention: Aiming at the problem of low accuracy of distribution network line loss detection in the above-mentioned existing technology, the present invention constructs a method for detecting distribution network line losses based on a multi-level transformer. In addition, the present invention also proposes a device for detecting distribution network line losses based on a multi-level transformer.

[0004] Technical Solution: On the one hand, the present invention provides a method for detecting distribution network line losses based on a multi-level transformer, and the method includes:

[0005] Detecting the line loss of the first end line based on the first detection period;

[0006] Detecting the line losses of the second end line, the first-level transformer, the second-level transformer to the Nth-level transformer based on the second detection period; and the first detection period is greater than the second detection period;

[0007] The first end line is the end branch line with a line loss rate less than or equal to the preset line loss rate, and the second end line is the end branch line with a line loss rate greater than the preset line loss rate;

[0008] This method is applied to the target distribution network, and the target distribution network includes a first-level transformer, a second-level transformer to an Nth-level transformer. The first-level transformer is connected to multiple second-level transformers through a first-level transmission line, and each of the second-level transformers is connected to a third-level transformer through a second-level transmission line, until it is obtained that the Nth-level transformer is connected to multiple end branch lines through an Nth-level transmission line, where N≥2.

[0009] Furthermore, the method further includes:

[0010] In the current detection period, if the current line loss rate of a first terminal line is greater than the preset line loss rate, then mark the first terminal line as a second terminal line, where the current line loss rate of the first terminal line is the line loss rate of the first terminal line in the current detection period.

[0011] Further, the method further includes:

[0012] If the number of times the second terminal line meets the first condition is greater than or equal to the preset number of times, mark the second terminal line as the first terminal line; the first condition is that the current line loss rate of the second terminal line is less than or equal to the preset line loss rate, the current line loss rate of the second terminal line is the line loss rate of the second terminal line in the current detection period, and the preset number of times is obtained based on a set of consecutive detection periods.

[0013] Further, the method further includes:

[0014] The line loss rate is expressed as:

[0015] Line loss rate = (power supply - power consumption) / power supply × 100%, where the power supply refers to the total power provided by the N - 1 level transformer to the terminal line within a certain period of time, and the power consumption refers to the sum of the power consumption measured by each electric meter on the terminal line.

[0016] Further, the method further includes:

[0017] Output a line loss adjustment instruction based on the load rate of the N - level transformer, the voltage adjustment rate of the terminal branch line, and the power factor of the terminal branch line, including:

[0018] If the load rate of the N - level transformer is less than the first preset load rate, control the on - load tap - changer of the first N - 1 level transformers to switch to the target voltage regulating tap according to a preset relationship table to increase the output voltage of the first N - 1 level transformers; the load rate of the N - level transformer is obtained based on the actual power consumption and the preset rated power, and the preset rated power is the sum of the rated powers of each N - level transformer.

[0019] Further, the method further includes:

[0020] Output a line loss adjustment instruction based on the load rate of the N - level transformer, the voltage adjustment rate of the terminal branch line, and the power factor of the terminal branch line, further including:

[0021] In response to the voltage adjustment rate of the third terminal line being less than the first preset adjustment rate and the power factor of the third terminal line being less than the preset power factor, increase the target power factor by a first step; the third terminal line is any terminal branch line.

[0022] Send the target power factor to the reactive power compensation device of the third end line to adjust the power factor of the third end line to the target power factor.

[0023] Further, the method further includes:

[0024] The output of the line loss adjustment instruction based on the load rate of the N-level transformer, the voltage adjustment rate of the end branch line, and the power factor of the end branch line further includes:

[0025] Predict the target load rate of the N-level transformer based on the historical load rate of the N-level transformer; the historical load rate of the N-level transformer is the historical data of the load rate of the N-level transformer;

[0026] In response to the target load rate of the N-level transformer being greater than the second preset load rate, reduce the power supply radius of the N-level transformer;

[0027] In response to the target load rate of the N-level transformer being less than the third preset load rate, increase the power supply radius of the N-level transformer.

[0028] Further, the method further includes:

[0029] The reduction of the power supply radius of the N-level transformer includes:

[0030] Display the location information of multiple first power consumption areas on the map; the first power consumption area is the power consumption area on the end branch line with power consumption less than the preset power consumption; the location information of the first power consumption area is the location information of the total electricity meter in the first power consumption area;

[0031] Perform cluster analysis on the location information of multiple first power consumption areas to obtain multiple second power consumption areas by clustering;

[0032] Calculate the total power consumption of the corresponding second power consumption area based on the power consumption of multiple first power consumption areas in each second power consumption area; determine the location information of the corresponding second power consumption area based on the cluster center of each second power consumption area;

[0033] Display the location information of multiple second power consumption areas and the location information of multiple third power consumption areas on the map; the third power consumption area is the power consumption area on the end branch line with power consumption greater than or equal to the preset power consumption;

[0034] Perform cluster analysis on the location information of multiple second power consumption areas and multiple third power consumption areas to obtain multiple fourth power consumption areas by clustering;

[0035] Determine the location of the N-level transformer based on the cluster center of the fourth power consumption area.

[0036] On the other hand, the present invention also provides a distribution network line loss detection device based on a multi-stage transformer. The device includes:

[0037] The first detection module is used to detect the line loss of the first end line based on the first detection period;

[0038] The second detection module is used to detect the line loss of the second end line, the first-stage transformer, the second-stage transformer to the N-stage transformer based on the second detection period;

[0039] The first detection period is greater than the second detection period; the first end line is an end branch line with a line loss rate less than or equal to the preset line loss rate, and the second end line is an end branch line with a line loss rate greater than the preset line loss rate;

[0040] The device is applied to a target distribution network, which includes a first-stage transformer, a second-stage transformer to an N-stage transformer. The first-stage transformer is connected to multiple second-stage transformers through a first-stage transmission line, and each second-stage transformer is connected to a third-stage transformer through a second-stage transmission line, until it is obtained that the N-stage transformer is connected to multiple end branch lines through an N-stage transmission line, where N≥2.

[0041] Finally, the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the above-mentioned distribution network line loss detection method are implemented.

[0042] Beneficial effects:

[0043] The present invention first marks the end branch line with a line loss rate less than or equal to the preset line loss rate as the first end line according to the line loss rate, and marks the end branch line with a line loss rate greater than the preset line loss rate as the second end line. Since the first end line has a smaller line loss rate, the detection times can be reduced, and the second end line with a larger line loss rate can be focused on. Accordingly, a larger detection period is set for the first end line, and a smaller detection period is set for the second end line. In this way, the data transmission volume in the line loss detection process can be reduced, which is beneficial to improving the data transmission accuracy, and further improving the accuracy of line loss detection. Description of the drawings

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0045] Figure 1Schematic flow chart of the distribution network line loss detection method provided by an embodiment of the present invention;

[0046] Figure 2 Topological structure diagram of the target distribution network provided by an embodiment of the present invention;

[0047] Figure 3 Structural block diagram of the distribution network line loss detection device provided by an embodiment of the present invention;

[0048] Figure 4 Schematic block diagram of the electronic device provided by an embodiment of the present invention. Detailed implementation manners

[0049] To better understand the present invention, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0050] Embodiment 1

[0051] The present invention provides a distribution network line loss detection method based on a multi-stage transformer. The method includes:

[0052] Detecting the line loss of the first end line based on the first detection period;

[0053] Detecting the line loss of the second end line, the first-stage transformer, the second-stage transformer to the Nth-stage transformer based on the second detection period; and the first detection period is greater than the second detection period;

[0054] The first end line is an end branch line with a line loss rate less than or equal to the preset line loss rate, and the second end line is an end branch line with a line loss rate greater than the preset line loss rate;

[0055] The method is applied to a target distribution network, which includes a first-stage transformer, a second-stage transformer to an Nth-stage transformer. The first-stage transformer is connected to multiple second-stage transformers through a first-stage transmission line, and each of the second-stage transformers is connected to a third-stage transformer through a second-stage transmission line, until it is obtained that the Nth-stage transformer is connected to multiple end branch lines through an Nth-stage transmission line, where N≥2.

[0056] Further, the method further includes:

[0057] In the current detection period, if the current line loss rate of a certain first end line is greater than the preset line loss rate, then mark the first end line as the second end line, and the current line loss rate of the first end line is the line loss rate of the first end line in the current detection period.

[0058] Further, the method further includes:

[0059] If the number of times the second end line meets the first condition is greater than or equal to a preset number of times, mark the second end line as the first end line; the first condition is that the current line loss rate of the second end line is less than or equal to a preset line loss rate, the current line loss rate of the second end line is the line loss rate of the second end line in the current detection period, and the preset number of times is obtained based on a set of consecutive detection periods.

[0060] Further, the method further includes:

[0061] The line loss rate is expressed as:

[0062] Line loss rate = (power supply - power consumption) / power supply × 100%, where the power supply refers to the total power supplied by the N - 1 level transformer to the end line within a certain period of time, and the power consumption refers to the sum of the power consumption measured by each electricity meter on the end line.

[0063] Further, the method further includes:

[0064] Output a line loss adjustment instruction based on the load rate of the N - level transformer, the voltage adjustment rate of the end branch line, and the power factor of the end branch line, including:

[0065] If the load rate of the N - level transformer is less than the first preset load rate, control the on - load tap changer of the first N - 1 level transformers to switch to the target voltage regulating tap based on a preset relationship table to increase the output voltage of the first N - 1 level transformers; the load rate of the N - level transformer is obtained based on the actual power consumption and the preset rated power, and the preset rated power is the sum of the rated powers of each N - level transformer.

[0066] Further, the method further includes:

[0067] Output a line loss adjustment instruction based on the load rate of the N - level transformer, the voltage adjustment rate of the end branch line, and the power factor of the end branch line, further including:

[0068] In response to the voltage adjustment rate of the third end line being less than the first preset adjustment rate and the power factor of the third end line being less than the preset power factor, increase the target power factor by a first step length; the third end line is any end branch line;

[0069] Send the target power factor to the reactive power compensation device of the third end line to adjust the power factor of the third end line to the target power factor.

[0070] Further, the method further includes:

[0071] Output a line loss adjustment instruction based on the load rate of the N - level transformer, the voltage regulation rate of the end - branch line, and the power factor of the end - branch line, further including:

[0072] Predict the target load rate of the N - level transformer based on the historical load rate of the N - level transformer; the historical load rate of the N - level transformer is the historical data of the load rate of the N - level transformer.

[0073] In response to the target load rate of the N - level transformer being greater than the second preset load rate, reduce the power supply radius of the N - level transformer.

[0074] In response to the target load rate of the N - level transformer being less than the third preset load rate, increase the power supply radius of the N - level transformer.

[0075] Furthermore, the method further includes:

[0076] The reducing the power supply radius of the N - level transformer includes:

[0077] Display the location information of multiple first power - consuming areas on a map; the first power - consuming area is a power - consuming area on the end - branch line where the electricity consumption is less than the preset electricity consumption; the location information of the first power - consuming area is the location information of the total electricity meter in the first power - consuming area.

[0078] Perform clustering analysis on the location information of multiple first power - consuming areas, and cluster to obtain multiple second power - consuming areas.

[0079] Calculate the total electricity consumption of the corresponding second power - consuming area based on the electricity consumption of multiple first power - consuming areas in each second power - consuming area; determine the location information of the corresponding second power - consuming area based on the clustering center of each second power - consuming area.

[0080] Display the location information of multiple second power - consuming areas and the location information of multiple third power - consuming areas on a map; the third power - consuming area is a power - consuming area on the end - branch line where the electricity consumption is greater than or equal to the preset electricity consumption.

[0081] Perform clustering analysis on the location information of multiple second power - consuming areas and multiple third power - consuming areas, and cluster to obtain multiple fourth power - consuming areas.

[0082] Determine the location of the N - level transformer based on the clustering center of the fourth power - consuming area.

[0083] Embodiment 2

[0084] In this embodiment, the distribution network usually adopts the method of supplying power by multiple - level transformers, such as Figure 2As shown, taking a two - stage transformer power supply as an example, multiple output terminals of the primary transformer are respectively connected to the input terminals of multiple secondary transformers, and multiple output terminals of the secondary transformers are respectively connected to multiple end - branch lines to supply power to electrical equipment on the end - branch lines.

[0085] Please refer to Figure 1 , Figure 1 FIG. is a schematic flowchart of a power distribution network line loss detection method provided by an embodiment of the present disclosure. This method is applied to a target power distribution network. The target power distribution network includes a primary transformer and a secondary transformer. The primary transformer is connected to multiple secondary transformers through a primary transmission line, and each secondary transformer is connected to multiple end - branch lines through a secondary transmission line. The method includes:

[0086] S101: Perform line loss detection on the first end - line based on the first detection period.

[0087] S102: Perform line loss detection on the second end - line, the primary transformer, and the secondary transformer based on the second detection period. The first detection period is greater than the second detection period; the first end - line is an end - branch line with a line loss rate less than or equal to a preset line loss rate, and the second end - line is an end - branch line with a line loss rate greater than the preset line loss rate.

[0088] The line loss rate of each end - branch line = (power supply - power consumption) / power supply × 100%. Among them, the power supply refers to the total power provided by the secondary transformer to the end - line within a certain period of time, and the power consumption refers to the sum of the power consumption measured by each electric meter on the end - line.

[0089] In this embodiment, first, end - branch lines with a line loss rate less than or equal to the preset line loss rate are marked as the first end - lines according to the line loss rate, and end - branch lines with a line loss rate greater than the preset line loss rate are marked as the second end - lines. Since the first end - lines have a smaller line loss rate, the number of detections can be reduced, and the second end - lines with a larger line loss rate are focused on. Accordingly, a larger detection period is set for the first end - lines, and a smaller detection period is set for the second end - lines. This can reduce the data transmission volume during the line loss detection process, is beneficial to improving the data transmission accuracy, and further improves the accuracy of the line loss detection.

[0090] In an embodiment disclosed in the present invention, the power distribution network line loss detection method further includes:

[0091] In response to the current line loss rate of the first end - line being greater than the preset line loss rate, mark the first end - line as the second end - line; the current line loss rate of the first end - line is the line loss rate of the first end - line in the current detection period.

[0092] In this embodiment, the line loss rate changes in real time, and the division of the first end line and the second end line is not fixed. If it is detected in the current detection cycle that the line loss rate of a certain first end line is greater than the preset line loss rate, it indicates that the line loss rate of this first end line has increased, and this first end line needs to be marked as the second end line, and the detection cycle of this first end line is reduced.

[0093] In an embodiment disclosed by the present invention, the method for detecting line loss of a distribution network further includes:

[0094] In response to the number of times that the second end branch line satisfies the first condition being greater than or equal to the preset number of times, marking the second end line as the first end line; the first condition is that the current line loss rate of the second end line is less than or equal to the preset line loss rate, and the current line loss rate of the second end line is the line loss rate of the second end line in the current detection cycle.

[0095] In this embodiment, if in a continuous plurality of detection cycles, the line loss rate of a certain second end line is less than or equal to the preset line loss rate, it indicates that the line loss rate of this second end line has decreased, and this second end line can be marked as the first end line, and the detection cycle of this second end line is increased.

[0096] Among them, those skilled in the art can flexibly design the specific value of the preset number of times, such as 3, 5, 7, 10, etc. The setting of the preset number of times can avoid the division error of the first end line and the second end line caused by a single line loss detection error.

[0097] In an embodiment disclosed by the present invention, the method for detecting line loss of a distribution network further includes:

[0098] Outputting a line loss adjustment instruction based on the load rate of the secondary transformer, the voltage regulation rate of the end branch line, and the power factor of the end branch line.

[0099] In this embodiment, while performing line loss detection, the relevant equipment can be adjusted based on the line loss detection results such as the load rate of the secondary transformer, the voltage regulation rate of the end branch line, and the power factor of the end branch line, so as to adjust the line loss of the distribution network and achieve the purpose of reducing the line loss.

[0100] In an embodiment disclosed by the present invention, the outputting a line loss adjustment instruction based on the load rate of the secondary transformer, the voltage regulation rate of the end branch line, and the power factor of the end branch line includes:

[0101] In response to the load rate of the secondary transformer being less than the first preset load rate, control the on-load tap-changer of the primary transformer to switch to the target tap for voltage regulation, so as to increase the output voltage of the primary transformer.

[0102] In this embodiment, if the load rate of the secondary transformer is small, there are few electrical equipment, and the total current demand of the electrical equipment is small. At this time, when the line transmission power remains unchanged, increasing the output voltage of the primary transformer can reduce the output current of the primary transformer, thereby reducing the line loss between the primary transformer and the secondary transformer.

[0103] The primary transformer can adopt an on-load voltage regulating transformer to facilitate the regulation of the output voltage of the primary transformer.

[0104] Specifically, the on-load voltage regulating transformer includes multiple tap positions for outputting different levels of voltage. According to the one-to-one correspondence between the tap positions and the output voltage (preset relationship table), switching the on-load tap-changer to the corresponding tap position can output the corresponding voltage.

[0105] In an embodiment disclosed by the present invention, the method for detecting the line loss of a distribution network further includes:

[0106] Add up the actual output powers of each secondary transformer to obtain the actual power consumption.

[0107] Calculate the load rate of the secondary transformer based on the actual power consumption and the preset rated power. The preset rated power is the sum of the rated powers of each secondary transformer.

[0108] In this embodiment, a method for calculating the load rate of the secondary transformer is given. First, add up the actual output powers of each secondary transformer to obtain the actual power consumption, then add up the rated powers of each secondary transformer to obtain the preset rated power, and finally calculate the ratio of the actual power consumption to the preset rated power to obtain the load rate of the secondary transformer.

[0109] In an embodiment disclosed by the present invention, the outputting the line loss adjustment instruction based on the load rate of the secondary transformer, the voltage adjustment rate of the end branch line, and the power factor of the end branch line further includes:

[0110] In response to the voltage adjustment rate of the third end line being less than the first preset adjustment rate and the power factor of the third end line being less than the preset power factor, increase the target power factor by a first step length; the third end line is any end branch line.

[0111] Send the target power factor to the reactive power compensation device of the third end line to adjust the power factor of the third end line to the target power factor.

[0112] In this embodiment, the voltage regulation rate of the terminal branch line where U is the actual output voltage (rms value), and Un is the rated voltage (rms value). When the actual output voltage of the terminal branch line is greater than the rated voltage, the voltage regulation rate is greater than zero; when the actual output voltage of the terminal branch line is less than the rated voltage, the voltage regulation rate is less than zero. To ensure the normal operation of electrical equipment, the voltage regulation rate of the terminal branch line should be maintained within a certain range.

[0113] By improving the power factor, the output voltage of the terminal branch line can be increased. In this embodiment, when it is detected that the actual output voltage of a certain terminal branch line is small, that is, the voltage regulation rate is small, it is further determined whether the power factor of the terminal branch line is small. If the power factor of the terminal branch line is small, the method of improving the power factor is preferentially used to increase the actual output voltage. This not only ensures the actual output voltage of the terminal branch line, but also improves the power factor and reduces the line loss (reactive power loss).

[0114] Specifically, the target power factor can be gradually increased in the first step length, and the increased target power factor is sent to the reactive power compensation device, and the output of the reactive power compensation device is adjusted multiple times until the voltage regulation rate is greater than or equal to the first preset regulation rate (the lower limit value of the voltage regulation rate), or the power factor is greater than or equal to the preset power factor.

[0115] In an embodiment disclosed in the present invention, the outputting a line loss adjustment instruction based on the load rate of the secondary transformer, the voltage regulation rate of the terminal branch line, and the power factor of the terminal branch line further includes:

[0116] In response to the voltage regulation rate of the fourth terminal line being less than the first preset regulation rate and the power factor of the fourth terminal line being greater than the preset power factor, increase the first target voltage value by the second step length.

[0117] Send the first target voltage value to the voltage stabilizing device of the fourth terminal line to adjust the voltage of the fourth terminal line to the first target voltage value.

[0118] In this embodiment, if the actual output voltage of a certain terminal branch line is low and the power factor is high, the actual output voltage of the terminal branch line can be increased by increasing the output of the voltage stabilizing device. Specifically, the first target voltage value can be gradually increased in the second step length, and the increased first target voltage value is sent to the voltage stabilizing device, and the output of the voltage stabilizing device is adjusted multiple times until the voltage regulation rate is greater than or equal to the first preset regulation rate (the lower limit value of the voltage regulation rate). Among them, the method of gradually increasing the first target voltage value and adjusting the voltage stabilizing device multiple times can avoid the impact on electrical equipment caused by voltage mutation.

[0119] In one embodiment of the present disclosure, the outputting of the line loss adjustment instruction based on the load rate of the secondary transformer, the voltage adjustment rate of the terminal branch line, and the power factor of the terminal branch line further includes:

[0120] In response to the voltage adjustment rate of the fifth terminal line being greater than the second preset adjustment rate, the second target voltage value is decreased by a second step size. Here, the fourth terminal line and the fifth terminal line can be any one of the terminal branch lines, and the fourth and fifth here are only used to mark various operating conditions.

[0121] The second target voltage value is sent to the voltage stabilizing device of the fifth terminal line to adjust the voltage of the fifth terminal line to the second target voltage value.

[0122] In this embodiment, if the actual output voltage of a certain terminal branch line is relatively high, the actual output voltage of the terminal branch line can be reduced by decreasing the output of the voltage stabilizing device. Specifically, the second target voltage value can be gradually decreased by the second step size, and the decreased second target voltage value is sent to the voltage stabilizing device, and the output of the voltage stabilizing device is adjusted multiple times until the voltage adjustment rate is less than or equal to the second preset adjustment rate (the upper limit value of the voltage adjustment rate). Among them, the method of gradually increasing the second target voltage value and adjusting the voltage stabilizing device multiple times can avoid the impact on electrical equipment caused by voltage mutation.

[0123] In one embodiment of the present invention disclosure, the outputting of the line loss adjustment instruction based on the load rate of the secondary transformer, the voltage adjustment rate of the terminal branch line, and the power factor of the terminal branch line further includes:

[0124] Predict the target load rate of the secondary transformer based on the historical load rate of the secondary transformer; the historical load rate of the secondary transformer is the historical data of the load rate of the secondary transformer.

[0125] In response to the target load rate of the secondary transformer being greater than the second preset load rate, the power supply radius of the secondary transformer is decreased.

[0126] In response to the target load rate of the secondary transformer being less than the third preset load rate, the power supply radius of the secondary transformer is increased.

[0127] In this embodiment, with the change of population distribution, the load rate of the secondary transformer will also change. For example, in the emerging development zone, the population is increasing and the power consumption load is increasing; in the mining area that has been mined for many years, with the reduction of coal mine resources, the population is decreasing and the power consumption load is decreasing. Therefore, it is necessary to adjust the power supply radius of the secondary transformer in a timely manner according to the change of the load rate to further reduce the line loss.

[0128] Specifically, a machine learning method can be adopted to predict the target load rate of the secondary transformer based on the historical load rate of the secondary transformer. If the predicted target load rate is greater than the second preset load rate, that is, the target load rate is relatively large, then it is necessary to add a secondary transformer to reduce the power supply radius of the original secondary transformer. If the predicted target load rate is less than the third preset load rate, that is, the target load rate is relatively small, then a part of the secondary transformers can be removed to increase the power supply radius of the remaining secondary transformers, and the electrical equipment of the removed secondary transformers can be connected to the remaining secondary transformers.

[0129] In an embodiment disclosed by the present invention, reducing the power supply radius of the secondary transformer specifically includes:

[0130] Display the location information of multiple first power consumption areas on a map; the first power consumption area is a power consumption area on the end branch line with a power consumption less than the preset power consumption; the location information of the first power consumption area is the location information of the total electricity meter in the first power consumption area.

[0131] Perform clustering analysis on the location information of multiple first power consumption areas to cluster and obtain multiple second power consumption areas.

[0132] Calculate the total power consumption of the corresponding second power consumption area based on the power consumption of multiple first power consumption areas in each second power consumption area; determine the location information of the corresponding second power consumption area based on the clustering center of each second power consumption area.

[0133] Display the location information of multiple second power consumption areas and the location information of multiple third power consumption areas on a map; the third power consumption area is a power consumption area on the end branch line with a power consumption greater than or equal to the preset power consumption.

[0134] Perform clustering analysis on the location information of multiple second power consumption areas and multiple third power consumption areas to cluster and obtain multiple fourth power consumption areas.

[0135] Determine the location of the secondary transformer based on the clustering center of the fourth power consumption area.

[0136] In this embodiment, each end branch line further includes multiple sub-branches, each sub-branch is a power consumption area, and a total electricity meter is set at the power supply inlet of each power consumption area for measuring the electricity consumption within the power consumption area.

[0137] By displaying the location information of each power consumption area on the map, the distribution of power consumption load can be intuitively understood. Considering that there are significant differences in the power consumption of each power consumption area, and the power consumption of each power consumption area cannot be understood only based on the location information, in this embodiment, the first power consumption area with relatively small power consumption is clustered, and the power consumption of the first power consumption area is merged into the second power consumption area according to the clustering result. The power consumption of the second power consumption area is equivalent to that of the third power consumption area. In this way, the distribution of power consumption load can be accurately understood based on the location information of the second power consumption area and the third power consumption area. Then, the location of the secondary transformer is determined according to the clustering results of the second power consumption area and the third power consumption area. Through the above two clustering analyses, the newly added secondary transformer is located at the center of the regional load, which can further reduce the power supply radius.

[0138] In an embodiment disclosed by the present invention, when increasing the power supply radius of the secondary transformer, the above two clustering analysis methods can also be adopted to intuitively display the distribution of power consumption load. On this basis, the secondary transformer in the area with relatively small load is removed, and the load in this area is connected to the nearby secondary transformer.

[0139] Embodiment 3

[0140] The present invention also provides a device for detecting line losses of a distribution network based on multi-stage transformers. The device includes:

[0141] The first detection module is used to detect the line losses of the first end line based on the first detection period;

[0142] The second detection module is used to detect the line losses of the second end line, the primary transformer, the secondary transformer to the Nth transformer based on the second detection period;

[0143] The first detection period is greater than the second detection period; the first end line is the end branch line with a line loss rate less than or equal to the preset line loss rate, and the second end line is the end branch line with a line loss rate greater than the preset line loss rate;

[0144] The device is applied to a target distribution network, and the target distribution network includes a primary transformer, a secondary transformer to the Nth transformer. The primary transformer is connected to a plurality of secondary transformers through primary transmission lines, and each of the secondary transformers is connected to a tertiary transformer through secondary transmission lines until it is obtained that the Nth transformer is connected to a plurality of end branch lines through Nth transmission lines, where N≥2.

[0145] In this embodiment, the distribution network usually adopts a multi-stage transformer power supply method. Taking the power supply by two-stage transformers as an example, multiple output terminals of the primary transformer are respectively connected to the input terminals of a plurality of secondary transformers, and multiple output terminals of the secondary transformer are respectively connected to a plurality of end branch lines to supply power to the electrical equipment on the end branch lines.

[0146] Specifically, corresponding to the distribution network line loss detection method in the above embodiment, Figure 3 This is a structural block diagram of a distribution network line loss detection device provided by an embodiment of the present disclosure. For the sake of illustration, only the parts related to the embodiments of the present disclosure are shown. Refer to Figure 3 The distribution network line loss detection device 20 includes: a first detection module 21 and a second detection module 22.

[0147] Among them, the first detection module 21 is used to detect the line loss of the first end line based on the first detection period.

[0148] The second detection module 22 is used to detect the line loss of the second end line, the primary transformer, and the secondary transformer based on the second detection period.

[0149] The first detection period is greater than the second detection period. The first end line is an end branch line with a line loss rate less than or equal to a preset line loss rate, and the second end line is an end branch line with a line loss rate greater than the preset line loss rate.

[0150] In an embodiment disclosed by the present invention, the distribution network line loss detection device 20 further includes:

[0151] A marking module 23, configured to mark the first end line as the second end line in response to the current line loss rate of the first end line being greater than the preset line loss rate. The current line loss rate of the first end line is the line loss rate of the first end line in the current detection period.

[0152] In an embodiment disclosed by the present invention, the marking module 23 is further configured to:

[0153] In response to the number of times the second end line satisfies the first condition being greater than or equal to a preset number of times, mark the second end line as the first end line. The first condition is that the current line loss rate of the second end line is less than or equal to the preset line loss rate, and the current line loss rate of the second end line is the line loss rate of the second end line in the current detection period.

[0154] In an embodiment disclosed by the present invention, the distribution network line loss detection device 20 further includes:

[0155] A line loss adjustment module 24, configured to output a line loss adjustment instruction based on the load rate of the secondary transformer, the voltage adjustment rate of the end branch line, and the power factor of the end branch line.

[0156] In an embodiment disclosed by the present invention, the line loss adjustment module 24 is specifically configured to:

[0157] In response to the load rate of the secondary transformer being less than the first preset load rate, control the on-load tap changer of the primary transformer to switch to the target voltage regulating tap based on a preset relationship table, so as to increase the output voltage of the primary transformer.

[0158] In an embodiment disclosed by the present invention, the line loss regulation module 24 is further configured to:

[0159] Add the actual output powers of each secondary transformer to obtain the actual power consumption.

[0160] Calculate the load rate of the secondary transformer based on the actual power consumption and a preset rated power. The preset rated power is the sum of the rated powers of each secondary transformer.

[0161] In an embodiment disclosed by the present invention, the line loss regulation module 24 is further configured to:

[0162] In response to the voltage regulation rate of the third end line being less than the first preset regulation rate and the power factor of the third end line being less than the preset power factor, increase the target power factor by a first step length. The third end line is any end branch line.

[0163] Send the target power factor to the reactive power compensation device of the third end line to adjust the power factor of the third end line to the target power factor.

[0164] In an embodiment disclosed by the present invention, the line loss regulation module 24 is further configured to:

[0165] In response to the voltage regulation rate of the fourth end line being less than the first preset regulation rate and the power factor of the fourth end line being greater than the preset power factor, increase the first target voltage value by a second step length.

[0166] Send the first target voltage value to the voltage stabilizing device of the fourth end line to adjust the voltage of the fourth end line to the first target voltage value.

[0167] In an embodiment disclosed by the present invention, the line loss regulation module 24 is further configured to:

[0168] In response to the voltage regulation rate of the fifth end line being greater than the second preset regulation rate, decrease the second target voltage value by a second step length.

[0169] Send the second target voltage value to the voltage stabilizing device of the fifth end line to adjust the voltage of the fifth end line to the second target voltage value.

[0170] In an embodiment disclosed by the present invention, the line loss regulation module 24 is further configured to:

[0171] Predict the target load rate of the secondary transformer based on the historical load rate of the secondary transformer. The historical load rate of the secondary transformer is the historical data of the load rate of the secondary transformer.

[0172] In response to the target load rate of the secondary transformer being greater than the second preset load rate, reduce the power supply radius of the secondary transformer.

[0173] In response to the target load rate of the secondary transformer being less than the third preset load rate, increase the power supply radius of the secondary transformer.

[0174] See Figure 4 , Figure 4 FIG. is a schematic block diagram of an electronic device provided by an embodiment of the present disclosure. The electronic device 300 in this embodiment may include: one or more processors 301, one or more input devices 302, one or more output devices 303, and one or more memories 304. The above-mentioned processors 301, input devices 302, output devices 303, and memories 304 communicate with each other through a communication bus 305. The memory 304 is used to store a computer program, and the computer program includes program instructions. The processor 301 is used to execute the program instructions stored in the memory 304. Among them, the processor 301 is configured to call the program instructions to execute the functions of each module / unit in the above-mentioned device embodiments, such as Figure 3 the functions of the modules 21 to 22 shown.

[0175] It should be understood that in the embodiments of the present disclosure, the so-called processor 301 may be a central processing unit (CPU), and this processor may also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), off-the-shelf programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or this processor may also be any conventional processor, etc.

[0176] The input device 302 may include a touchpad, a fingerprint sensor (for collecting the fingerprint information and the direction information of the fingerprint of the user), a microphone, etc., and the output device 303 may include a display (such as an LCD), a speaker, etc.

[0177] The memory 304 may include a read-only memory and a random access memory, and provide instructions and data to the processor 301. A part of the memory 304 may also include a non-volatile random access memory. For example, the memory 304 may also store information about the device type.

[0178] In a specific implementation, the processor 301, the input device 302, and the output device 303 described in the embodiments of the present disclosure may implement the implementation manners described in the first and second embodiments of the distribution network line loss detection method provided by the embodiments of the present disclosure, and may also implement the implementation manner of the electronic device described in the embodiments of the present disclosure, which will not be elaborated herein.

[0179] In another embodiment of the present disclosure, a computer-readable storage medium is provided. The computer-readable storage medium stores a computer program, and the computer program includes program instructions. When the program instructions are executed by a processor, all or part of the processes in the methods of the above embodiments are implemented. It can also be completed by instructing relevant hardware through the computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, the steps of the above method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in the form of source code, object code, executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal, and software distribution medium, etc. It should be noted that the content included in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0180] The computer-readable storage medium may be an internal storage unit of the electronic device in any of the foregoing embodiments, such as the hard disk or memory of the electronic device. The computer-readable storage medium may also be an external storage device of the electronic device, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the electronic device. Further, the computer-readable storage medium may also include both the internal storage unit and the external storage device of the electronic device. The computer-readable storage medium is used to store the computer program and other programs and data required by the electronic device. The computer-readable storage medium may also be used to temporarily store the data that has been output or will be output.

[0181] Those of ordinary skill in the art can realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. To clearly illustrate the interchangeability of hardware and software, the composition and steps of the examples have been generally described according to functions in the above description. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of this disclosure.

[0182] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the above-described electronic devices and units can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0183] In several embodiments provided in this application, it should be understood that the disclosed electronic devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed couplings or direct couplings or communication connections to each other can be indirect couplings or communication connections through some interfaces or units, or can also be electrical, mechanical, or other forms of connection.

[0184] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiments of this disclosure.

[0185] In addition, the functional units in various embodiments of this disclosure can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

[0186] The above is only the specific implementation manner of this disclosure, but the protection scope of this disclosure is not limited thereto. Any person skilled in the art within the technical scope disclosed by this disclosure can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of this disclosure. Therefore, the protection scope of this disclosure should be subject to the protection scope of the claims.

Claims

1. A distribution network line loss detection method based on a multi-stage transformer, characterized in that: The method includes: Perform line loss detection on the first end line based on the first detection cycle; Perform line loss detection on the second terminal line, the primary transformer, the secondary transformer to the Nth transformer based on the second detection cycle; and the first detection cycle is greater than the second detection cycle; The first terminal line is a terminal branch line having a line loss rate less than or equal to a preset line loss rate, and the second terminal line is a terminal branch line having a line loss rate greater than the preset line loss rate; The method is applied to a target distribution network, the target distribution network includes a primary transformer, a secondary transformer to an N-level transformer, the primary transformer is connected to a plurality of secondary transformers through a primary transmission line, each of the secondary transformers is connected to a tertiary transformer through a secondary transmission line, until an N-level transformer is connected to a plurality of terminal branch lines through an N-level transmission line, wherein N≥2; Based on the load rate of the N-level transformer, the voltage regulation rate of the terminal branch line and the power factor output line loss adjustment instruction of the terminal branch line, specifically includes: If the load rate of the N-level transformer is less than the first preset load rate, the on-load tap changer of the first N-1-level transformer is controlled to switch to the target voltage regulating tap based on the preset relationship table to increase the output voltage of the first N-1-level transformer; the load rate of the N-level transformer is obtained based on the actual power consumption and the preset rated power, and the preset rated power is the sum of the rated powers of each N-level transformer.

2. The method for detecting line loss in a distribution network based on a multi-stage transformer according to claim 1, characterized in that: The method further includes: In the current detection cycle, if the current line loss rate of a first terminal line is greater than the preset line loss rate, the first terminal line is marked as the second terminal line, and the current line loss rate of the first terminal line is the line loss rate of the first terminal line in the current detection cycle.

3. The method for detecting line loss in a distribution network based on a multi-stage transformer according to claim 2, characterized in that: The method further includes: If the second terminal line satisfies the first condition for a number of times greater than or equal to a preset number of times, the second terminal line is marked as the first terminal line; the first condition is that the current line loss rate of the second terminal line is less than or equal to a preset line loss rate, the current line loss rate of the second terminal line is the line loss rate of the second terminal line in the current detection cycle, and the preset number of times is obtained according to a set number of consecutive detection cycles.

4. The method for detecting line loss in a distribution network based on a multi-stage transformer according to any one of claims 1 to 3, characterized in that: The line loss rate is expressed as: Line loss rate = (power supply - power consumption) / power supply × 100%, where power supply refers to the total amount of electricity provided by the N-1 level transformer to the terminal line within a certain period of time, and power consumption refers to the sum of the power consumption measured by each meter on the terminal line.

5. The method for detecting line loss in a distribution network based on a multi-stage transformer according to claim 4, characterized in that: Based on the load rate of the N-level transformer, the voltage regulation rate of the terminal branch line and the power factor output line loss adjustment instruction of the terminal branch line, it also includes: In response to the voltage regulation rate of the third terminal line being less than the first preset regulation rate and the power factor of the third terminal line being less than the preset power factor, increasing the target power factor by a first step length; the third terminal line is any terminal branch line; The target power factor is sent to the reactive power compensation device of the third terminal line to adjust the power factor of the third terminal line to the target power factor.

6. The method for detecting line loss in a distribution network based on a multi-stage transformer according to claim 5, characterized in that: The output line loss adjustment instruction based on the load rate of the N-level transformer, the voltage adjustment rate of the terminal branch line and the power factor of the terminal branch line also includes: Predicting a target load rate of an N-level transformer based on a historical load rate of the N-level transformer; the historical load rate of the N-level transformer is historical data of the load rate of the N-level transformer; If it is predicted that the target load rate of the N-level transformer is greater than the second preset load rate, that is, the target load rate is larger, it is necessary to increase the N-level transformer to reduce the power supply radius of the original N-level transformer; If the predicted target load rate of the N-level transformer is less than the third preset load rate, that is, the target load rate is small, then a part of the N-level transformers will be removed, the power supply radius of the remaining N-level transformers will be increased, and the electrical equipment of the removed N-level transformers will be connected to the remaining N-level transformers.

7. The method for detecting line loss in a distribution network based on a multi-stage transformer according to claim 6, characterized in that: The method of reducing the power supply radius of the original N-level transformer includes: Displaying the location information of multiple first power consumption areas on a map; the first power consumption area is a power consumption area where the power consumption on the terminal branch line is less than the preset power consumption; the location information of the first power consumption area is the location information of the total power meter in the first power consumption area; Performing cluster analysis on the location information of the plurality of first power consumption areas, and obtaining a plurality of second power consumption areas by clustering; Calculate the total power consumption of the corresponding second power consumption area based on the power consumption of multiple first power consumption areas in each second power consumption area; determine the location information of the corresponding second power consumption area based on the cluster center of each second power consumption area; Displaying the location information of the plurality of second power consumption areas and the location information of the plurality of third power consumption areas on a map; the third power consumption area is a power consumption area where the power consumption on the terminal branch line is greater than or equal to the preset power consumption; Performing cluster analysis on the location information of the plurality of second power consumption areas and the plurality of third power consumption areas, and obtaining a plurality of fourth power consumption areas by clustering; The locations of the N-level transformers are determined based on the cluster center of the fourth power consumption area.

8. A distribution network line loss detection device based on a multi-stage transformer, characterized in that: The device includes: The first detection module is used to perform line loss detection of the first end line based on the first detection cycle; The second detection module is used to perform line loss detection of the second terminal line, the primary transformer, the secondary transformer to the N-level transformer based on the second detection cycle; The first detection cycle is greater than the second detection cycle; the first terminal line is a terminal branch line with a line loss rate less than or equal to a preset line loss rate, and the second terminal line is a terminal branch line with a line loss rate greater than a preset line loss rate; The device is applied to a target distribution network, the target distribution network includes a primary transformer, a secondary transformer to an N-level transformer, the primary transformer is connected to a plurality of secondary transformers through a primary transmission line, each of the secondary transformers is connected to a tertiary transformer through a secondary transmission line, until an N-level transformer is connected to a plurality of terminal branch lines through an N-level transmission line, wherein N≥2; The adjustment instruction implementation module is used to output the line loss adjustment instruction based on the load rate of the N-level transformer, the voltage adjustment rate of the terminal branch line and the power factor of the terminal branch line, specifically including: If the load rate of the N-level transformer is less than the first preset load rate, the on-load tap changer of the first N-1-level transformer is controlled to switch to the target voltage regulating tap based on the preset relationship table to increase the output voltage of the first N-1-level transformer; the load rate of the N-level transformer is obtained based on the actual power consumption and the preset rated power, and the preset rated power is the sum of the rated powers of each N-level transformer.

9. An electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the distribution network line loss detection method according to any one of claims 1 to 7 when executing the computer program.

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