A method, apparatus, equipment, and storage medium for detecting the tap position of a transformer.

Abstract

This invention discloses a method, apparatus, device, and storage medium for detecting the tap position of a transformer. The method includes: constructing a simulated topology model of the distribution transformer area; simulating the operation of the topology model; detecting the operating data of each node at multiple time points, including the voltage values ​​of the high-voltage side and the low-voltage side; verifying the voltage value of the high-voltage side from the perspective of reactive voltage; verifying the voltage value of the low-voltage side from the perspective of multiple factors affecting the head end of the distribution transformer area; and identifying the tap position of the distribution transformer based on the verified voltage values ​​of the high-voltage side and the low-voltage side. This embodiment allows for remote detection without the need for on-site wiring by technicians, and can simultaneously check multiple distribution transformer areas, making it easy to operate. This embodiment takes into account the fluctuation effects caused by multiple factors affecting the head end of the distribution transformer area, which can significantly improve the accuracy of identifying the tap position of the distribution transformer.

Description

Technical Field

[0001] This invention relates to the field of electric power technology, and in particular to a method, apparatus, equipment and storage medium for detecting the tap position of a transformer. Background Technology

[0002] Distribution transformers for 10kV and other high-voltage lines are widely used in urban and rural power distribution systems. They supply power directly to end users by stepping down the voltage and are key equipment connecting 10kV medium-voltage networks and low-voltage networks below 400V. The tap position of a distribution transformer refers to the position of the primary coil tap. By adjusting the tap position, the transformer ratio can be switched to change the low-voltage output voltage. Commonly used S11 and higher model distribution transformers generally have 5 adjustment levels, with an adjustment step of 2.5% of the rated voltage on the high-voltage side (e.g., 10kV). Currently, adjusting the tap position of the distribution transformer is one of the main operation and maintenance methods to suppress seasonal voltage fluctuations on the 10kV line side and improve the voltage quality at the low-voltage end of the distribution transformer area.

[0003] According to the survey, urban and rural public distribution transformers are mainly no-load tap changing transformers. The tap positions require manual adjustment and recording during power outages, which presents the following problems: First, the manual adjustment records of grassroots power supply units lack management, are not updated in a timely manner, and have low reliability; second, tap position verification requires power outages of the distribution transformers and inspections of the transformer areas, which is time-consuming, labor-intensive, and affects the reliability of power supply; third, unclear distribution transformer tap position information will restrict distribution network simulation calculations and voltage analysis, hindering important tasks such as transformer area loss reduction and voltage problem management.

[0004] Currently, transformer tap positions can be identified using dedicated measuring devices or data algorithms. For dedicated measuring devices, a high-voltage acquisition circuit can receive the wireless voltage signal from the high-voltage side of the transformer, and a low-voltage measurement circuit can measure the voltage signal from the low-voltage side of the transformer. Then, the main controller calculates the voltages on the high-voltage and low-voltage sides and determines the close tap positions. For data algorithms, the topology relationship of transformers connected to the same 10kV line is used to analyze the voltage differences between different tap positions of adjacent transformers, thereby determining the tap position relationship of adjacent transformers. By comparing the voltages of adjacent transformer areas, the voltage tap position analysis of all transformer areas is completed.

[0005] However, the measuring device still requires manual on-site wiring, which is quite cumbersome; the data algorithm design deviates from reality, resulting in low accuracy in identifying gear positions. Summary of the Invention

[0006] This invention provides a method, apparatus, device, and storage medium for detecting the tap position of a transformer, in order to balance the ease and accuracy of identifying the tap position of a distribution transformer.

[0007] According to one aspect of the present invention, a method for detecting the tap position of a transformer is provided, comprising: A simulation topology model is constructed for the distribution transformer area. The topology model was simulated and run, and the operating data of each node was detected at multiple time points. The operating data included the voltage value on the high-voltage side and the voltage value on the low-voltage side. From the perspective of reactive voltage, the voltage value on the high-voltage side is verified; The voltage value on the low-voltage side is verified from the perspective of multiple factors affecting the first end of the transformer area; The tap position of the distribution transformer is identified by verifying the voltage values ​​of the high-voltage side and the low-voltage side.

[0008] According to another aspect of the present invention, a transformer tap position detection device is provided, comprising: The topology model building module is used to build a simulation topology model for the distribution transformer area. The running data detection module is used to simulate the topology model and detect the running data of each node at multiple time points. The running data includes the voltage value on the high-voltage side and the voltage value on the low-voltage side. The high-voltage detection module is used to verify the voltage value on the high-voltage side under reactive voltage conditions. A low-voltage detection module is used to verify the voltage value on the low-voltage side under the influence of multiple factors affecting the first end of the transformer area. The gear position identification module is used to identify the gear position of the distribution transformer based on the verified voltage values ​​of the high-voltage side and the low-voltage side.

[0009] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program that can be executed by the at least one processor, which enables the at least one processor to perform the transformer tap position detection method according to any embodiment of the present invention.

[0010] According to another aspect of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium storing a computer program, the computer program being configured to cause a processor to execute and implement the transformer tap position detection method according to any embodiment of the present invention.

[0011] In this embodiment, a simulated topology model is constructed for the distribution transformer area. The topology model is simulated and run, and the operating data of each node is detected at multiple time points. The operating data includes the voltage values ​​on the high-voltage side and the low-voltage side. The voltage value on the high-voltage side is verified from the perspective of reactive voltage, and the voltage value on the low-voltage side is verified from the perspective of multiple factors affecting the head end of the distribution transformer area. The tap position of the distribution transformer is identified based on the verified voltage values ​​of the high-voltage side and the low-voltage side. This embodiment can perform remote detection without the need for technicians to manually connect wires on-site. Multiple distribution transformer areas can be checked simultaneously, and the operation is simple. This embodiment takes into account the fluctuation effects caused by multiple factors affecting the head end of the distribution transformer area, which can significantly improve the accuracy of identifying the tap position of the distribution transformer.

[0012] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a flowchart of a transformer tap position detection method according to Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the structure of a transformer tap position detection device according to Embodiment 2 of the present invention; Figure 3 This is a schematic diagram of the structure of an electronic device that implements the transformer tap position detection method of the present invention. Detailed Implementation

[0015] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0016] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0017] Example 1 Figure 1 This is a flowchart of a transformer tap position detection method provided in Embodiment 1 of the present invention. This embodiment is applicable to the case of tap position detection of distribution transformers based on multi-factor identification. This method can be executed by a transformer tap position detection device, which can be implemented in hardware and / or software and can be configured in electronic equipment. Figure 1 As shown, the method includes: Step 101: Construct a simulation topology model for the distribution transformer area.

[0018] In this embodiment, the distribution area where the distribution transformer is located may include the distribution area where a public distribution transformer of new distribution network elements such as distributed photovoltaic grid connection, distributed energy storage and AC / DC charging piles is located.

[0019] The distribution transformer to be assessed is located in an area with potential distributed power sources such as distributed photovoltaic grid connection, distributed energy storage, and AC / DC charging piles, which have a substantial impact on the active power, reactive power, power flow direction, power factor, and three-phase imbalance at the beginning of the distribution area.

[0020] For the distribution transformer area, a simulation topology model can be constructed to simulate the operation of the distribution transformer area.

[0021] In practice, the power distribution automation system can obtain power transmission data measured at multiple time points (e.g., 96 moments, i.e., every 15 minutes) during the operation of the distribution transformer area and high-voltage transmission line within a preset time period (e.g., selecting one day in the most recent week).

[0022] Obtain the topology representing the power station, high-voltage transmission lines, and distribution transformers (i.e., station-line-transformer) from the GIS (Geographic Information System) of the power distribution network.

[0023] Obtain parameters of high-voltage transmission lines (such as 10kV lines) from the GIS system of the power distribution network.

[0024] The topology model is constructed using power distribution network simulation tools such as OpenDSS (The Open Distribution System Simulator) with transmission data, topology structure and parameters.

[0025] Step 102: Simulate the topology model and check the running data of each node at multiple time points.

[0026] Power flow simulation calculations can be performed on the topology model using power distribution network simulation tools such as OpenDSS to obtain the operating data of each node at multiple time points (e.g., 96 time points, i.e., every 15 minutes).

[0027] Step 103: Verify the voltage value on the high-voltage side from the perspective of reactive voltage.

[0028] In this embodiment, the operating data includes the voltage value U on the high-voltage side, which is the side of the distribution transformer with the higher voltage.

[0029] Within a preset time period (e.g., 00:00-23:45), the voltage values ​​U on the high-voltage side are sorted in chronological order to obtain a list of high-voltage simulation values ​​U. f .

[0030] Traversing the list of high-voltage simulation values ​​U f The voltage values ​​on the medium and high voltage sides can be logically verified from the perspective of reactive voltage, that is, to verify whether the voltage values ​​on the high voltage side conform to the law of reactive voltage.

[0031] In one embodiment of the present invention, step 103 may include the following steps: Step 1031: Select two nodes as voltage references from the perspective of reactive voltage, and use them as target nodes.

[0032] Using reactive voltage as the verification standard, two suitable nodes are selected as voltage reference nodes, which can be denoted as target nodes for easy differentiation.

[0033] In the specific implementation, the target nodes include the first target node and the second target node. Then, the line pole segment where the connection point of the transformer area is located can be determined.

[0034] On the one hand, along the reactive power flow direction at the end of the line pole, select the distribution automation switch or dedicated transformer metering point with the closest electrical distance upstream of the connection point as the first target node P. u It has a corresponding voltage value U cu .

[0035] On the other hand, along the reactive power flow direction at the end of the line pole, select the distribution automation switch or dedicated transformer metering point with the closest electrical distance downstream of the connection point as the second target node P. d It has a corresponding voltage value U cd .

[0036] Step 1032: Compare the voltage value of the high-voltage side that is adjacent in time with the voltage value of the target node to obtain the voltage difference.

[0037] In this embodiment, the verification can be performed using the nearest neighbor comparison method. In this case, the voltage value of the high-voltage side that is temporally adjacent is compared with the voltage value of the target node to obtain the voltage difference.

[0038] In a specific implementation, the voltage difference includes the first voltage difference ΔU t1 Second voltage difference ΔU t2 .

[0039] Iterate through each time point On the one hand, for the same time point t, the first target node P is... u voltage value U cut Subtract the voltage value U on the high-voltage side t The first voltage difference ΔU is obtained. t1 ,Right now, .

[0040] On the other hand, for the same time point t, the voltage value U on the high-voltage side... t Subtract the second target node P d voltage value U cdt The second voltage difference ΔU is obtained. t2 ,Right now, .

[0041] Step 1033: Verify the voltage value on the high-voltage side according to the voltage difference.

[0042] By analyzing the voltage difference between neighboring voltage values, the voltage value on the high-voltage side can be verified.

[0043] For each time point, perform the verification in the above manner, and then directly iterate through all time points.

[0044] The number of time points that satisfy the reactive voltage law is counted. The reactive voltage law is defined as follows: the first voltage difference is greater than or equal to zero, and the second voltage difference is greater than or equal to zero. .

[0045] If the number is greater than or equal to the preset threshold (e.g., more than 90 out of 96 time points meet the threshold), then the voltage value on the high-voltage side is determined to conform to the reactive voltage pattern and passes the verification.

[0046] Step 104: Verify the voltage value on the low-voltage side from the perspective of multiple factors affecting the head end of the transformer area.

[0047] In this embodiment, the operating data includes the voltage value on the low-voltage side, which is the side of the distribution transformer with the lower voltage.

[0048] For the voltage value on the low-voltage side, multiple factors affecting the head end of the transformer area can be selected. Under the use of these factors, the voltage value on the low-voltage side can be logically verified, that is, whether the voltage value on the low-voltage side is correlated.

[0049] In one embodiment of the present invention, step 104 may include the following steps: Step 1041: For the same time point, extract the active power and reactive power of the transformer area, and the current and voltage values ​​of the first phase, the second phase, and the third phase on the low-voltage side from the operating data.

[0050] Iterate through each time point, and for each time point t, extract the active power P of each transformer area from the running data. t With reactive power Q t The current value I of the first phase (phase A) on the low-voltage side. at With voltage value U at The current value I of the second phase (phase B) bt With voltage value U bt The current value I of the third phase (C phase) ct With voltage value U ct .

[0051] Step 1042: Calculate the power factor based on the active power and reactive power of the transformer area, as a factor affecting the head end of the transformer area.

[0052] The active power P of the reference transformer area t With the reactive power Q of the transformer area t Calculate the power factor cosφ as a factor affecting the head end of the transformer area.

[0053] For example, the active power and reactive power of the transformer area are substituted into the following formula to calculate the power factor, which is used as a factor affecting the head end of the transformer area: in, The power factor at time t, The active power of the transformer substation. This refers to the reactive power of the transformer substation.

[0054] Step 1043: Calculate the three-phase voltage imbalance based on the voltage values ​​of the first phase, the second phase, and the third phase, as a factor affecting the head end of the transformer area.

[0055] Referencing the voltage value U of the first phase (phase A) at The voltage value U of the second phase (phase B) bt The voltage value U of the third phase (C phase) ct The degree of imbalance between the three-phase voltages is calculated and denoted as the three-phase voltage imbalance ε. u As a factor influencing the head end of the district.

[0056] For example, the voltage values ​​of the first phase, the second phase, and the third phase are substituted into the following formula to calculate the three-phase voltage imbalance, which is used as a factor affecting the head end of the transformer substation: in, Let be the three-phase voltage imbalance at time t. This is the voltage value of the first phase. This is the voltage value of the second phase. This is the voltage value of the third phase.

[0057] Step 1044: Calculate the three-phase current imbalance based on the current values ​​of the first phase, the second phase, and the third phase, as a factor affecting the head end of the transformer area.

[0058] Refer to the current value I of the first phase (phase A) att The current value I of the second phase (phase B) bt The current value I of the third phase (C phase) ct The degree of imbalance between the three-phase currents is calculated and denoted as the three-phase current imbalance ε. i As a factor influencing the head end of the district.

[0059] For example, the current values ​​of the first phase, the second phase, and the third phase are substituted into the following formula to calculate the three-phase current imbalance, which is used as a factor affecting the head end of the transformer substation: in, Let be the three-phase current imbalance at time t. This is the current value of the first phase. This is the current value of the second phase. This is the current value of the third phase.

[0060] Step 1045: For the same point in time, calculate the correlation between the voltage value on the low-voltage side based on the power factor, the three-phase voltage imbalance, and the three-phase current imbalance.

[0061] The power factor cosφ and three-phase voltage imbalance ε of the transformer area to be judged will be calculated within a preset time period. u With three-phase current imbalance ε i Using time points as the key, the power factor cosφ and the three-phase voltage imbalance ε u With three-phase current imbalance ε i For each value, key-value pairs are generated to form a data table M.

[0062] For each time point t in data table M, the power factor cosφ and the three-phase voltage imbalance ε are... u With three-phase current imbalance ε i Statistical analysis was performed to calculate the correlation between the voltage values ​​on the low-voltage side.

[0063] In the specific implementation, the data table M is iterated through for each time point, and the power factor cosφ is sorted in reverse order (from largest to smallest) to obtain the first sort X of each power factor cosφ. The three-phase voltage imbalance ε is then considered. u Arrange the three-phase voltage unbalances in reverse order (from largest to smallest) to obtain the individual three-phase voltage unbalances ε. u The second ranking Y, for the three-phase current imbalance ε i Arrange the phases in reverse order (from largest to smallest) to obtain the three-phase current imbalance ε. i The third sort Z, thus determining the first sort X of power factor cosφ for the same time point t. t Three-phase voltage imbalance ε u Second sort Y t With three-phase current imbalance ε i The third sort Z t .

[0064] Calculate the first sort X t Second sort Y t With the third sort Z t The average value between the two values ​​is taken as the voltage quality value S of the low-voltage side at time point t. t .

[0065] So, voltage quality value S t It is expressed as follows: Step 1046: Determine the voltage values ​​of the multiple low-voltage sides with the highest correlation and pass the verification.

[0066] The voltage quality values ​​S at multiple time points are sorted in ascending order (from smallest to largest). The top few data groups (including the voltage values ​​on the low-voltage side) from the data table M (e.g., 1 / 4, i.e., 24 time points) are selected, that is, the data groups on the low-voltage side with the highest correlation, forming the data table N to be calculated.

[0067] Step 105: Identify the tap position of the distribution transformer based on the verified high-voltage side voltage value and the verified low-voltage side voltage value.

[0068] In this embodiment, the voltage values ​​of the high-voltage side and the low-voltage side, which are verified, can reflect the impact of the distribution transformer at different taps, thereby identifying the tap position of the distribution transformer.

[0069] In specific implementation, the voltage value on the low-voltage side includes the reference voltage value U of the first phase (phase A). a The voltage value U of the second phase (phase B) b The voltage value U of the third phase (C phase) c Then, we iterate through each time point t in the data table N to be calculated, and for each time point, we read the impedance voltage U of the transformer area from the operating data. k Based on impedance voltage U k Calculated impedance voltage drop ΔU z For the first phase (phase A), the voltage value U at The voltage value U of the second phase (phase B) bt The voltage value U of the third phase (C phase) ct Calculate the average value to obtain the average voltage value. Using the voltage value on the high-voltage side as the numerator and the sum of the average voltage value and the impedance voltage drop as the denominator, calculate the transformer ratio K of the transformer area at time point t. t .

[0070] So, the ratio K t It is expressed as follows: In this embodiment, multiple standard values ​​can be set in advance through experiments or other means. These standard values ​​are the turns ratios of the distribution transformer when it is in a specified tap position.

[0071] For example, a distribution transformer has five taps, with standard values ​​of 26.25, 25.625, 35, 44.375, and 53.75 respectively.

[0072] Calculate the difference between each current ratio and each preset standard value. For the same ratio, compare all differences and find the difference with the smallest value.

[0073] If a certain difference is the smallest at a certain point in time, the transformation ratio is assigned to the tap corresponding to that standard value, and this is recorded as the tap of the distribution transformer at that point in time.

[0074] Since there will be some error in the detection process, which may lead to incorrect tap position at a single time point, the tap position of the distribution transformer at each time point can be written into the discrimination set D.

[0075] In the discriminant set D, the ratio between the number of each gear type and the total number of gear types is calculated to obtain the proportion of each gear type.

[0076] For all time points, if the proportion of a certain level exceeds a preset threshold (such as 90%), it indicates that the confidence level of that level is high, and the distribution transformer is finally determined to be in that level.

[0077] In this embodiment, a simulated topology model is constructed for the distribution transformer area. The topology model is simulated and run, and the operating data of each node is detected at multiple time points. The operating data includes the voltage values ​​on the high-voltage side and the low-voltage side. The voltage value on the high-voltage side is verified from the perspective of reactive voltage, and the voltage value on the low-voltage side is verified from the perspective of multiple factors affecting the head end of the distribution transformer area. The tap position of the distribution transformer is identified based on the verified voltage values ​​of the high-voltage side and the low-voltage side. This embodiment can perform remote detection without the need for technicians to manually connect wires on-site. Multiple distribution transformer areas can be checked simultaneously, and the operation is simple. This embodiment takes into account the fluctuation effects caused by multiple factors affecting the head end of the distribution transformer area, which can significantly improve the accuracy of identifying the tap position of the distribution transformer.

[0078] Example 2 Figure 2 This is a schematic diagram of the structure of a transformer tap position detection device provided in Embodiment 3 of the present invention. Figure 2 As shown, the device includes: Topology model building module 201 is used to build a simulation topology model for the distribution transformer area. The running data detection module 202 is used to simulate the topology model and detect the running data of each node at multiple time points. The running data includes the voltage value on the high-voltage side and the voltage value on the low-voltage side. The high voltage detection module 203 is used to verify the voltage value of the high voltage side under the angle of reactive voltage. The low-voltage detection module 204 is used to verify the voltage value on the low-voltage side under the angle of multiple factors affecting the first end of the transformer area; The gear position identification module 205 is used to identify the gear position of the distribution transformer based on the verified voltage value of the high-voltage side and the verified voltage value of the low-voltage side.

[0079] In one embodiment of the present invention, the topology model construction module 201 includes: The power transmission data acquisition module is used to acquire power transmission data measured during operation of the distribution transformer area and high-voltage transmission lines within a preset time period. The topology acquisition module is used to acquire the topology representing the power station, the high-voltage transmission line, and the distribution transformer; A parameter acquisition module is used to acquire the parameters of the high-voltage transmission line; The simulation tool calling module is used to call the power distribution network simulation tool to construct a topology model using the transmission data, the topology structure, and the parameters.

[0080] In one embodiment of the present invention, the high-voltage detection module 203 includes: The target node selection module is used to select two nodes that serve as voltage references as target nodes from the perspective of reactive voltage. A voltage comparison module is used to compare the voltage value of the high-voltage side that is temporally adjacent with the voltage value of the target node to obtain the voltage difference; The voltage difference verification module is used to verify the voltage value on the high-voltage side according to the voltage difference.

[0081] In one embodiment of the present invention, the target node includes a first target node and a second target node; the target node selection module is further configured to: Determine the line pole section where the connection point of the transformer substation is located; Along the reactive power flow direction at the end of the line pole, select the distribution automation switch or dedicated transformer metering point that is electrically closest to the connection point upstream of the connection point as the first target node; Along the reactive power flow direction at the end of the line pole, select the distribution automation switch or dedicated transformer metering point that is electrically closest to the connection point downstream as the second target node; The voltage difference includes a first voltage difference and a second voltage difference; the voltage comparison module is also used for: For the same time point, the voltage value of the first target node is subtracted from the voltage value of the high-voltage side to obtain the first voltage difference; For the same time point, the voltage value on the high-voltage side is subtracted from the voltage value of the second target node to obtain the second voltage difference; The voltage difference verification module is also used for: The number of time points that satisfy the reactive voltage law is counted, wherein the reactive voltage law is that the first voltage difference is greater than or equal to zero, and the second voltage difference is greater than or equal to zero. If the number is greater than or equal to the preset threshold value, then the voltage value on the high-voltage side is determined to conform to the law of reactive voltage and passes the verification.

[0082] In one embodiment of the present invention, the low-voltage detection module 204 includes: The operation data extraction module is used to extract the active power and reactive power of the transformer area, and the current and voltage values ​​of the first phase, the second phase, and the third phase on the low-voltage side from the operation data for the same time point. The power factor calculation module is used to calculate the power factor based on the active power and reactive power of the transformer area, as a factor affecting the head end of the transformer area; The three-phase voltage imbalance calculation module is used to calculate the three-phase voltage imbalance based on the voltage values ​​of the first phase, the second phase, and the third phase, as a factor affecting the head end of the transformer area. The three-phase current imbalance calculation module is used to calculate the three-phase current imbalance based on the current value of the first phase, the current value of the second phase, and the current value of the third phase, as a factor affecting the head end of the transformer area. The correlation calculation module is used to calculate the correlation between the voltage value on the low-voltage side and the power factor, the three-phase voltage imbalance, and the three-phase current imbalance for the same time point. The correlation verification module is used to determine whether the voltage values ​​of the multiple low-voltage sides with the highest correlation pass the verification.

[0083] In one embodiment of the present invention, the power factor calculation module is further configured to: The active power and reactive power of the transformer substation are substituted into the following formula to calculate the power factor, which is used as a factor affecting the head end of the transformer substation: in, The power factor is... The active power of the transformer substation. The reactive power of the transformer substation is denoted as .

[0084] In one embodiment of the present invention, the three-phase voltage imbalance calculation module is further configured to: Substitute the voltage values ​​of the first phase, the second phase, and the third phase into the following formula to calculate the three-phase voltage imbalance, which is used as a factor affecting the head end of the transformer substation: in, The three-phase voltage imbalance is... The voltage value of the first phase. This is the voltage value of the second phase. The voltage value of the third phase.

[0085] In one embodiment of the present invention, the three-phase current imbalance calculation module is further used for: Substitute the current values ​​of the first phase, the second phase, and the third phase into the following formula to calculate the three-phase current imbalance, which is used as a factor affecting the head end of the transformer substation: in, The three-phase current imbalance is mentioned above. This is the current value of the first phase. This is the current value of the second phase. The current value of the third phase.

[0086] In one embodiment of the present invention, the correlation calculation module is further configured to: For the same time point, a first ranking of the power factor, a second ranking of the three-phase voltage imbalance, and a third ranking of the three-phase current imbalance are determined respectively. The average value among the first sort, the second sort, and the third sort is calculated as the voltage quality value of the low-voltage side.

[0087] In one embodiment of the present invention, the voltage value on the low-voltage side includes the voltage value of the first phase, the voltage value of the second phase, and the voltage value of the third phase; The gear position recognition module 205 includes: An impedance voltage reading module is used to read the impedance voltage of the transformer area from the operating data for each of the time points; Impedance voltage drop calculation module, used to calculate the impedance voltage drop based on the impedance voltage; The average voltage value calculation module is used to calculate the average value of the voltage values ​​of the first phase, the second phase, and the third phase to obtain the average voltage value. The turns ratio calculation module is used to calculate the turns ratio of the transformer substation by using the voltage value on the high-voltage side as the numerator and the sum of the average voltage value and the impedance voltage drop as the denominator. The difference calculation module is used to calculate the difference between each of the turns ratios and a preset standard value, wherein the standard value is the turns ratio of the distribution transformer when it is in a specified tap position. The gear division module is used to divide the gear ratio to the gear corresponding to the standard value if the difference is the smallest. The gear position determination module is used to determine that the distribution transformer is in the gear position if the proportion of a certain gear exceeds a preset proportion threshold for all the time points.

[0088] The transformer tap position detection device provided in this embodiment of the invention can execute the transformer tap position detection method provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects for executing the transformer tap position detection method.

[0089] Example 3 Figure 3 A schematic diagram of an electronic device 10, which can be used to implement embodiments of the present invention, is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0090] like Figure 3 As shown, the electronic device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12 or a random access memory (RAM) 13, communicatively connected to the at least one processor 11. The memory stores computer programs executable by the at least one processor. The processor 11 can perform various appropriate actions and processes based on the computer program stored in the ROM 12 or loaded from storage unit 18 into the RAM 13. The RAM 13 can also store various programs and data required for the operation of the electronic device 10. The processor 11, ROM 12, and RAM 13 are interconnected via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0091] Multiple components in electronic device 10 are connected to I / O interface 15, including: input unit 16, such as keyboard, mouse, etc.; output unit 17, such as various types of displays, speakers, etc.; storage unit 18, such as disk, optical disk, etc.; and communication unit 19, such as network card, modem, wireless transceiver, etc. Communication unit 19 allows electronic device 10 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0092] Processor 11 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. Processor 11 performs the various methods and processes described above, such as the transformer tap detection method.

[0093] In some embodiments, the transformer tap position detection method may be implemented as a computer program tangibly contained in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program may be loaded and / or installed on electronic device 10 via ROM 12 and / or communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the transformer tap position detection method described above may be performed. Alternatively, in other embodiments, processor 11 may be configured to perform the transformer tap position detection method by any other suitable means (e.g., by means of firmware).

[0094] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0095] Computer programs used to implement the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowcharts and / or block diagrams to be performed. The computer programs may be executed entirely on a machine, partially on a machine, or as a standalone software package, partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0096] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0097] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0098] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or middleware components (e.g., application servers), or frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

[0099] A computing system can include clients and servers. Clients and servers are generally located far apart and typically interact through communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a hosting product within the cloud computing service system to address the shortcomings of traditional physical hosts and VPS services, such as high management difficulty and weak business scalability.

[0100] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0101] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for detecting the tap position of a transformer, characterized in that, include: A simulation topology model is constructed for the distribution transformer area. The topology model was simulated and run, and the operating data of each node was detected at multiple time points. The operating data included the voltage value on the high-voltage side and the voltage value on the low-voltage side. From the perspective of reactive voltage, the voltage value on the high-voltage side is verified; The voltage value on the low-voltage side is verified from the perspective of multiple factors affecting the first end of the transformer area; The tap position of the distribution transformer is identified based on the verified voltage values ​​of the high-voltage side and the low-voltage side. From the perspective of reactive voltage, the voltage value on the high-voltage side is verified, including: Within a preset time period, the voltage values ​​on the high-voltage side are sorted in chronological order to obtain a list of high-voltage simulation values. Iterate through the voltage values ​​of the high-voltage side in the high-voltage simulation value list, and perform logical verification on the voltage values ​​of the high-voltage side from the perspective of reactive voltage. The verification of the low-voltage side voltage value under the influence of multiple factors affecting the first end of the transformer area includes: For the same time point, the active power and reactive power of the transformer area, the current and voltage values ​​of the first phase, the current and voltage values ​​of the second phase, and the current and voltage values ​​of the third phase on the low-voltage side are extracted from the operating data. The power factor is calculated based on the active power and reactive power of the transformer area, and is used as a factor affecting the head end of the transformer area. The three-phase voltage imbalance is calculated based on the voltage values ​​of the first phase, the second phase, and the third phase, and is used as a factor affecting the head end of the transformer substation. The three-phase current imbalance is calculated based on the current values ​​of the first phase, the second phase, and the third phase, and is used as a factor affecting the head end of the transformer substation. For the same time point, the correlation between the power factor, the three-phase voltage imbalance, and the three-phase current imbalance and the voltage value on the low-voltage side is calculated. The voltage values ​​of the low-voltage side with the highest correlation are determined through verification.

2. The method according to claim 1, characterized in that, The topology model for simulating the distribution transformer area includes: Acquire power transmission data measured during operation of the distribution transformer area and high-voltage transmission lines within a preset time period; Obtain the topology representing the power station, the high-voltage transmission line, and the distribution transformer; Obtain the parameters of the high-voltage transmission line; The power distribution network simulation tool is invoked to construct a topology model using the power transmission data, the topology structure, and the parameters.

3. The method according to claim 1, characterized in that, The verification of the voltage value on the high-voltage side from the perspective of reactive voltage includes: From the perspective of reactive voltage, two nodes are selected as voltage references and designated as target nodes; The voltage value of the high-voltage side that is temporally adjacent is compared with the voltage value of the target node to obtain the voltage difference; The voltage value on the high-voltage side is verified according to the voltage difference.

4. The method according to claim 3, characterized in that, The target nodes include a first target node and a second target node; The selection of two nodes as voltage references from the perspective of reactive voltage, as target nodes, includes: Determine the line pole section where the connection point of the transformer substation is located; Along the reactive power flow direction at the end of the line pole, select the distribution automation switch or dedicated transformer metering point that is electrically closest to the connection point upstream of the connection point as the first target node; Along the reactive power flow direction at the end of the line pole, select the distribution automation switch or dedicated transformer metering point that is electrically closest to the connection point downstream as the second target node; The voltage difference includes a first voltage difference and a second voltage difference; The step of comparing the voltage value of the high-voltage side that is temporally adjacent with the voltage value of the target node to obtain the voltage difference includes: For the same time point, the voltage value of the first target node is subtracted from the voltage value of the high-voltage side to obtain the first voltage difference; For the same time point, the voltage value on the high-voltage side is subtracted from the voltage value of the second target node to obtain the second voltage difference; The step of verifying the voltage value on the high-voltage side according to the voltage difference includes: The number of time points that satisfy the reactive voltage law is counted, wherein the reactive voltage law is that the first voltage difference is greater than or equal to zero, and the second voltage difference is greater than or equal to zero. If the number is greater than or equal to the preset threshold value, then the voltage value on the high-voltage side is determined to conform to the law of reactive voltage and passes the verification.

5. The method according to claim 1, characterized in that, The calculation of the power factor based on the active power and reactive power of the transformer substation, as a factor affecting the head end of the substation, includes: The active power and reactive power of the transformer substation are substituted into the following formula to calculate the power factor, which is used as a factor affecting the head end of the transformer substation: in, The power factor is... The active power of the transformer substation. The reactive power of the transformer substation; The calculation of the three-phase voltage imbalance based on the voltage values ​​of the first phase, the second phase, and the third phase, as a factor affecting the head end of the transformer substation, includes: Substitute the voltage values ​​of the first phase, the second phase, and the third phase into the following formula to calculate the three-phase voltage imbalance, which is used as a factor affecting the head end of the transformer substation: in, The three-phase voltage imbalance is... The voltage value of the first phase. This is the voltage value of the second phase. The voltage value of the third phase; The calculation of the three-phase current imbalance based on the current values ​​of the first phase, the second phase, and the third phase, as a factor affecting the head end of the transformer substation, includes: Substitute the current values ​​of the first phase, the second phase, and the third phase into the following formula to calculate the three-phase current imbalance, which is used as a factor affecting the head end of the transformer substation: in, The three-phase current imbalance is mentioned above. This is the current value of the first phase. This is the current value of the second phase. The current value of the third phase; The calculation of the correlation between the power factor, the three-phase voltage imbalance, and the three-phase current imbalance and the voltage value on the low-voltage side for the same point in time includes: For the same time point, a first ranking of the power factor, a second ranking of the three-phase voltage imbalance, and a third ranking of the three-phase current imbalance are determined respectively. The average value among the first sort, the second sort, and the third sort is calculated as the voltage quality value of the low-voltage side.

6. The method according to any one of claims 1-4, characterized in that, The voltage values ​​on the low-voltage side include the voltage values ​​of the first phase, the second phase, and the third phase. The step of identifying the tap position of the distribution transformer based on the verified voltage values ​​of the high-voltage side and the low-voltage side includes: For each of the aforementioned time points, the impedance voltage of the transformer area is read from the operational data; Impedance voltage drop calculated based on the impedance voltage; The average voltage value is obtained by calculating the average value of the voltage values ​​of the first phase, the second phase, and the third phase. The transformer ratio of the transformer area is calculated by using the voltage value on the high-voltage side as the numerator and the sum of the average voltage value and the impedance voltage drop as the denominator. Calculate the difference between each of the stated turns ratios and a preset standard value, where the standard value is the turns ratio of the distribution transformer when it is in a specified tap position; If the difference is the smallest, then the gear ratio is assigned to the gear corresponding to the standard value; For all the aforementioned time points, if the proportion of a certain gear exceeds a preset threshold, then the distribution transformer is determined to be in that gear.

7. A transformer tap position detection device, characterized in that, include: The topology model building module is used to build a simulation topology model for the distribution transformer area. The running data detection module is used to simulate the topology model and detect the running data of each node at multiple time points. The running data includes the voltage value on the high-voltage side and the voltage value on the low-voltage side. The high-voltage detection module is used to verify the voltage value on the high-voltage side under reactive voltage conditions. A low-voltage detection module is used to verify the voltage value on the low-voltage side under the influence of multiple factors affecting the first end of the transformer area. A gear position identification module is used to identify the gear position of the distribution transformer based on the verified voltage values ​​of the high-voltage side and the low-voltage side. From the perspective of reactive voltage, the voltage value on the high-voltage side is verified, including: Within a preset time period, the voltage values ​​on the high-voltage side are sorted in chronological order to obtain a list of high-voltage simulation values. Iterate through the voltage values ​​of the high-voltage side in the high-voltage simulation value list, and perform logical verification on the voltage values ​​of the high-voltage side from the perspective of reactive voltage. The verification of the low-voltage side voltage value under the influence of multiple factors affecting the first end of the transformer area includes: For the same time point, the active power and reactive power of the transformer area, the current and voltage values ​​of the first phase, the current and voltage values ​​of the second phase, and the current and voltage values ​​of the third phase on the low-voltage side are extracted from the operating data. The power factor is calculated based on the active power and reactive power of the transformer area, and is used as a factor affecting the head end of the transformer area. The three-phase voltage imbalance is calculated based on the voltage values ​​of the first phase, the second phase, and the third phase, and is used as a factor affecting the head end of the transformer substation. The three-phase current imbalance is calculated based on the current values ​​of the first phase, the second phase, and the third phase, and is used as a factor affecting the head end of the transformer substation. For the same time point, the correlation between the power factor, the three-phase voltage imbalance, and the three-phase current imbalance and the voltage value on the low-voltage side is calculated. The voltage values ​​of the low-voltage side with the highest correlation are determined through verification.

8. An electronic device, characterized in that, The electronic device includes: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program that can be executed by the at least one processor, the computer program being executed by the at least one processor to enable the at least one processor to perform the transformer tap position detection method according to any one of claims 1-6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the tap position detection method for the transformer according to any one of claims 1-6.

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