Distribution transformer loss analysis method and device based on multi-parameter cooperation

Abstract

The invention provides a distribution transformer loss analysis method and device based on multi-parameter cooperation, and relates to the technical field of power grids. According to the invention, the high-voltage side line current, the low-voltage side line current and the line voltage are monitored, the line voltage of the high-voltage side of the transformer is obtained through calculation, no professional detection equipment is needed for detection, and dangerous operation in a high-voltage large-current environment is avoided. Furthermore, the high-voltage side line voltage is corrected through the low-voltage side load and the working temperature of the transformer, the accuracy of the high-voltage side line voltage is improved, and then the calculation accuracy of the transformer loss is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power grid, and in particular to a method and device for analyzing distribution transformer loss based on multi-parameter coordination. Background Art

[0003] The improvement of distribution transformer energy efficiency mainly involves the calculation of distribution transformer energy utilization efficiency. For online distribution transformers, the high voltage side has high voltage and current, which requires professional testing equipment and testing technology, and the testing cost is high. In addition, there are safety hazards in the detection process of the high voltage side of the distribution transformer, which increases the difficulty of detection, making it difficult to detect the loss of online distribution transformers, and thus making it impossible to calculate the energy utilization efficiency of distribution transformers safely and at low cost.

[0004] On the other hand, the loss of distribution transformers can also be estimated by transformer rated parameters, but transformer loss is affected by multiple factors such as load, temperature, working hours, etc., and the estimation result has the problem of low accuracy. Therefore, there is a technical problem of difficulty in determining the loss of distribution transformers. Summary of the invention

[0005] The present invention provides a method and device for analyzing the loss of a distribution transformer based on multi-parameter coordination, which can realize accurate calculation of the loss of the distribution transformer.

[0006] In a first aspect, the present invention provides a method for analyzing the loss of a distribution transformer based on multi-parameter coordination, the method comprising: monitoring the line current on the high-voltage side of each phase of the distribution transformer, the line voltage and line current on the low-voltage side, and the operating temperature of the transformer; performing polar coordinate decomposition based on the line voltage and line current on the low-voltage side of each phase of the distribution transformer, and the short-circuit impedance of the transformer to determine the line voltage of each phase on the high-voltage side; determining the load on the low-voltage side based on the line voltage and line current on the low-voltage side; correcting the line voltage of each phase on the high-voltage side based on the low-voltage side load and the operating temperature to obtain the corrected line voltage of each phase on the high-voltage side; determining the loss of each phase transformer based on the line voltage and line current on the low-voltage side of each phase of the distribution transformer, and the corrected line voltage and line current on the high-voltage side, to realize multi-parameter loss analysis of the distribution transformer.

[0007] In a possible implementation, the line voltage and line current on the low-voltage side of each phase of the distribution transformer and the short-circuit impedance of the transformer are decomposed into polar coordinates to determine the line voltage of each phase on the high-voltage side, including: determining the load power factor based on the line voltage and line current on the low-voltage side; and determining the line voltage on the high-voltage side by performing polar coordinate decomposition based on the line voltage and line current on the low-voltage side, the short-circuit impedance of the transformer, and the load power factor.

[0008] In a possible implementation, the line voltage of each phase on the high-voltage side is corrected based on the low-voltage side load and the operating temperature to obtain the corrected line voltage of each phase on the high-voltage side, including: determining the temperature rise load factor based on the real-time operating temperature and real-time load of the distribution transformer; and correcting the line voltage on the high-voltage side based on the temperature rise load factor to obtain the corrected line voltage of each phase on the high-voltage side.

[0009] In a possible implementation, the transformer loss of each phase is determined based on the line voltage and line current on the low-voltage side of each phase of the distribution transformer, and the corrected line voltage and line current on the high-voltage side, including: determining the reactive loss of each phase of the distribution transformer based on the rated capacity of the distribution transformer, the no-load current percentage, the short-circuit impedance voltage percentage, and the corrected line voltage and line current on the high-voltage side; calculating the apparent power of each phase of the distribution transformer based on the corrected line voltage and line current on the high-voltage side of each phase of the distribution transformer; determining the active power of each phase on the high-voltage side of the distribution transformer based on the apparent power of each phase of the distribution transformer and the reactive loss of each phase; determining the active power of each phase on the low-voltage side of the distribution transformer based on the line voltage and line current on the low-voltage side of each phase of the distribution transformer, and the load power factor; determining the active loss of each phase of the distribution transformer based on the active power of each phase on the high-voltage side of the distribution transformer and the active power of each phase on the low-voltage side.

[0010] In a possible implementation, after determining the transformer losses of each phase based on the line voltage and line current on the low-voltage side of each phase of the distribution transformer and the corrected line voltage and line current on the high-voltage side to implement multi-parameter loss analysis of the distribution transformer, the method further includes: calculating the operating efficiency of the distribution transformer based on the transformer losses of each phase and the corrected line voltage and line current on the high-voltage side of each phase of the distribution transformer; and adjusting the operating state of the distribution transformer based on the transformer losses of each phase and the operating efficiency of the distribution transformer to improve the energy efficiency of the distribution transformer.

[0011] In a possible implementation, the operating efficiency of the distribution transformer is calculated based on the transformer losses of each phase and the corrected line voltage and line current on the high-voltage side of each phase of the distribution transformer, including: determining the apparent power of each phase of the distribution transformer based on the corrected line voltage and line current on the high-voltage side of each phase of the distribution transformer; determining the operating efficiency of each phase of the distribution transformer based on the apparent power of each phase of the distribution transformer and the transformer losses of each phase.

[0012] In a possible implementation, the operating state of the distribution transformer is adjusted based on the transformer loss of each phase and the operating efficiency of the distribution transformer to improve the energy efficiency of the distribution transformer, including: calculating the reactive loss rate of each phase based on the reactive loss of each phase and the apparent power of each phase; determining the reactive compensation target value based on the reactive loss rate of each phase; and adjusting the input value of the compensation capacitor of each phase based on the reactive compensation target value to improve the energy efficiency of the distribution transformer.

[0013] In a possible implementation, the operating state of the distribution transformer is adjusted based on the losses of the transformers of each phase and the operating efficiency of the distribution transformer to improve the energy efficiency of the distribution transformer, including: calculating the three-phase load imbalance rate of the distribution transformer based on the line current and line voltage of each phase on the high-voltage side and the low-voltage side of the distribution transformer, and the losses of each phase transformer; matching and adjusting the three-phase load based on the three-phase load imbalance rate of the distribution transformer to obtain a matching result, and the matching result includes the distribution of the three-phase load after adjustment; based on the matching result, adjusting the load of each phase of the distribution transformer to improve the energy efficiency of the distribution transformer.

[0014] In a possible implementation, after adjusting the operating state of the distribution transformer based on the losses of the transformers of each phase and the operating efficiency of the distribution transformer to improve the energy efficiency of the distribution transformer, the method further includes: obtaining the operating data of the distribution transformer in a historical period, the operating data including the line voltage and line current of each phase on the low-voltage side, the line current of each phase on the high-voltage side, the operating temperature, and the operating efficiency of each phase; based on the operating data in the historical period, taking the operating efficiency of each phase as the dependent variable, and taking the line voltage and line current of each phase on the low-voltage side, and the line current and operating temperature of each phase on the high-voltage side as the independent variables, performing polynomial fitting to obtain an operating efficiency prediction model; and predicting the operating efficiency of the distribution transformer based on the operating efficiency prediction model.

[0015] In a second aspect, an embodiment of the present invention provides an analysis device for distribution transformer losses based on multi-parameter collaboration, the analysis device comprising: a communication module for monitoring the line current on the high-voltage side of each phase of the distribution transformer, the line voltage and line current on the low-voltage side, and the operating temperature of the transformer; a processing module for performing polar coordinate decomposition based on the line voltage and line current on the low-voltage side of each phase of the distribution transformer, and the short-circuit impedance of the transformer, to determine the line voltage of each phase on the high-voltage side; determining the low-voltage side load based on the line voltage and line current on the low-voltage side; correcting the line voltage of each phase on the high-voltage side based on the low-voltage side load and the operating temperature to obtain the corrected line voltage of each phase on the high-voltage side; determining the transformer loss of each phase based on the line voltage and line current on the low-voltage side of each phase of the distribution transformer, and the corrected line voltage and line current on the high-voltage side, to realize multi-parameter loss analysis of the distribution transformer.

[0016] In a third aspect, an embodiment of the present invention provides an electronic device, comprising a memory and a processor, the memory storing a computer program, the processor being used to call and run the computer program stored in the memory to perform the steps of the method described in the first aspect and any possible implementation method of the first aspect.

[0017] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and wherein when the computer program is executed by a processor, the steps of the method described in the first aspect and any possible implementation method of the first aspect are implemented.

[0018] The present invention provides a method and device for analyzing the loss of a distribution transformer based on multi-parameter coordination. The present invention monitors the high-voltage side line current, the low-voltage side line current and the line voltage, and obtains the line voltage on the high-voltage side of the transformer by calculation, without the need for detection by professional detection equipment, thereby avoiding dangerous operations in a high-voltage and high-current environment. Furthermore, the present invention corrects the high-voltage side line voltage by the low-voltage side load and the transformer operating temperature, thereby improving the accuracy of the high-voltage side line voltage, and thus improving the calculation accuracy of the transformer loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 It is a schematic diagram of the architecture of a data acquisition system for a distribution transformer provided by an embodiment of the present invention;

[0021] Figure 2 It is a schematic diagram of a data collection and transmission process of a distribution transformer provided by an embodiment of the present invention;

[0022] Figure 3 It is a flow chart of a control method of a distribution transformer provided by an embodiment of the present invention;

[0023] Figure 4 is a structural schematic diagram of a control device for a distribution transformer provided by an embodiment of the present invention;

[0024] Figure 5 It is a structural schematic diagram of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0025] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0026] In the description of the present invention, unless otherwise specified, " / " means "or", for example, A / B can mean A or B. "And / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, "at least one" and "plurality" refer to two or more. The words "first", "second", etc. do not limit the quantity and execution order, and the words "first", "second", etc. do not limit them to be different.

[0027] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a concrete way for easy understanding.

[0028] In addition, the terms "including" and "having" and any variations thereof mentioned in the description of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or modules is not limited to the listed steps or modules, but may optionally include other steps or modules that are not listed, or may optionally include other steps or modules that are inherent to these processes, methods, products or devices.

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clear, the following will be described through specific embodiments in conjunction with the accompanying drawings of the present invention.

[0030] As described in the background technology, there are technical problems in the current distribution transformers, such as difficulty in determining losses and inability to improve energy efficiency.

[0031] To solve the above technical problems, Figure 1 As shown, an embodiment of the present invention provides a data acquisition system for a distribution transformer. Figure 2As shown, an embodiment of the present invention provides a data acquisition and transmission flow chart of a distribution transformer. The data acquisition system installs a current transformer (CT) on each phase of the high-voltage side of the distribution transformer. By installing a relatively simple current transformer on the high-voltage side and using micro-power wireless transmission, there is no need to install high-cost professional detection equipment, and it is suitable for high-voltage and high-current detection environments, ensuring safe operation.

[0032] The data acquisition system collects the operating parameters of the low-voltage distribution station area through the intelligent fusion terminal of the station area, and realizes the collection of data such as low-voltage side line current, line voltage and power factor.

[0033] After collecting data, the intelligent fusion terminal in the substation communicates with the distribution automation master station via 4G or Ethernet, transmitting the collected high-voltage and low-voltage side data for transformer loss and operating efficiency analysis, and then regulating the transformer to improve the energy efficiency of the transformer.

[0034] like Figure 3 As shown, an embodiment of the present invention provides a method for analyzing distribution transformer loss based on multi-parameter coordination. The method includes steps S101-S105.

[0035] S101. Monitor the line current on the high voltage side of each phase of the distribution transformer, the line voltage and line current on the low voltage side, and the operating temperature of the distribution transformer.

[0036] S102: Based on the line voltage and line current on the low-voltage side of each phase of the distribution transformer and the short-circuit impedance of the transformer, polar coordinate decomposition is performed to determine the line voltage of each phase on the high-voltage side.

[0037] As a possible implementation manner, step S102 may be specifically implemented as steps S1021 - S1022 .

[0038] S1021. Determine a load power factor based on the line voltage and line current on the low voltage side.

[0039] S1022. Perform polar coordinate decomposition based on the line voltage and line current on the low-voltage side, the transformer short-circuit impedance, and the load power factor to determine the line voltage on the high-voltage side.

[0040] S103: Determine the load on the low-voltage side based on the line voltage and line current on the low-voltage side.

[0041] S104. Based on the low-voltage side load and the operating temperature, correct the line voltage of each phase on the high-voltage side to obtain a corrected line voltage of each phase on the high-voltage side.

[0042] As a possible implementation manner, step S104 may be specifically implemented as steps S1041 - S1042 .

[0043] S1041. Determine a temperature rise load factor based on the real-time operating temperature and real-time load of the distribution transformer.

[0044] S1041. Based on the temperature rise load factor, correct the high-voltage side line voltage to obtain a corrected line voltage of each phase on the high-voltage side.

[0045] Exemplarily, the embodiment of the present invention may calculate the high-voltage side line voltage based on the following formula.

[0046]

[0047] in, is the per unit value of the high voltage side line voltage, is the per unit value of the low voltage side line voltage, is the per unit value of short-circuit impedance; is the per unit value of the low voltage side line current, and θ is the load power factor angle.

[0048] It should be noted that the calculation formula for the high-voltage side line voltage is as follows.

[0049]

[0050] Where: I 1N is the rated line current on the high voltage side of the distribution transformer, I 2N is the rated line current on the low voltage side, U 2N is the rated line voltage on the low voltage side; U1 is the line voltage on the high voltage side, U2 is the line voltage on the low voltage side, θ U1 is the voltage phase angle on the high voltage side, U2 can be read through the intelligent fusion terminal; I1 is the line current on the high voltage side, I2 is the line current on the low voltage side, θ is the load power factor angle, I2 and θ can be read through the intelligent fusion terminal; I1 * is the per unit value of the high voltage side line current, is the per unit value of the low voltage line current, is the per unit value of the high voltage side line voltage, is the per unit value of the low voltage side line voltage, P is the per unit short-circuit impedance of the distribution transformer; k is the short-circuit loss of the distribution transformer, S N is the rated capacity of the distribution transformer, U k % is the short-circuit voltage percentage of the distribution transformer.

[0051] The process of deriving the impedance standard value is as follows.

[0052] Short-circuit impedance includes short-circuit resistance and short-circuit reactance. K =R K +jX K ; Among them, Z Kis the short-circuit impedance, R K is the short-circuit resistance, X K is the short-circuit reactance.

[0053] The per-unit value of short-circuit impedance is the ratio of short-circuit impedance to short-circuit base value. Impedance base value Z N =U N / I N , U N is the rated voltage of the high-voltage side line of the distribution transformer, I N is the rated value of the high voltage side line current of the distribution transformer. From the above analysis, we can get:

[0054]

[0055] It should be noted that In this way, the following derivation can be performed to obtain the per-unit value Z of the short-circuit impedance: * K The calculation formula for .

[0056]

[0057] Among them, P K is the short-circuit loss of the distribution transformer, U k % is the short-circuit impedance percentage of the distribution transformer. N is the rated capacity of the distribution transformer.

[0058] Based on the above-mentioned high-voltage side line voltage derivation formula and the derivation formula of the per-unit value of the short-circuit impedance, the per-unit value of the high-voltage side voltage can be derived. The specific derivation process is shown as follows.

[0059]

[0060] By performing polar coordinate calculation on the above formula, we can get the following formula.

[0061] In this way, based on the fact that the real part is equal to the real part and the imaginary part is equal to the imaginary part, we can get the following formula.

[0062]

[0063] In this way, the calculation formula for the high-voltage side line voltage can be obtained.

[0064] After the per-unit value of the high-voltage side line voltage is calculated, the embodiment of the present invention can correct the per-unit value of the high-voltage side line voltage according to the temperature rise load factor to improve the calculation accuracy of the high-voltage side line voltage.

[0065] Exemplarily, the embodiment of the present invention can correct the per unit value of the high-voltage side line voltage based on the following formula.

[0066]

[0067] Where X is the temperature rise load factor, a0 = 1, and the constant term, a n is the temperature rise component, a n =(x1-a) / a, x1 is the actual load, a is 60% load, b n is the load component, b n =(x2-b) / b, x2 is the actual temperature, b is the ambient temperature of 50 degrees, the maximum temperature rise limit is 65, and L is the sampling period. For example, L can be 1h, and the loss of the distribution transformer is calculated once every hour.

[0068] S105. Based on the line voltage and line current on the low-voltage side of each phase of the distribution transformer and the corrected line voltage and line current on the high-voltage side, the transformer loss of each phase is determined to implement multi-parameter loss analysis of the distribution transformer.

[0069] In the embodiment of the present application, transformer loss includes active loss and reactive loss.

[0070] As a possible implementation manner, step S105 may be specifically implemented as steps S1051 - S1055 .

[0071] S1051. Determine the reactive power loss of each phase of the distribution transformer based on the rated capacity, no-load current percentage, short-circuit impedance voltage percentage, high-voltage side corrected line voltage and line current of the distribution transformer.

[0072] S1052. Calculate the apparent power of each phase of the distribution transformer based on the corrected line voltage and line current on the high-voltage side of each phase of the distribution transformer.

[0073] S1053. Determine the active power of each phase on the high-voltage side of the distribution transformer based on the apparent power of each phase and the reactive power loss of each phase.

[0074] S1054. Determine the active power of each phase on the low-voltage side of the distribution transformer based on the line voltage and line current of each phase on the low-voltage side of the distribution transformer and the load power factor.

[0075] S1055. Determine the active power loss of each phase of the distribution transformer based on the active power of each phase on the high-voltage side and the active power of each phase on the low-voltage side of the distribution transformer.

[0076] Exemplarily, the embodiments of the present invention can calculate the active loss and reactive loss of each phase of the distribution transformer by the following formula.

[0077]

[0078] P 损 =P A +PB +P C

[0079] ΔA=P 损 *T

[0080] Among them, P 单相 is the single-phase active power loss of the distribution transformer, Q 单相 is the reactive power loss of the single-phase distribution transformer, S N is the rated capacity of the distribution transformer, U1I1 is the apparent power of the distribution transformer, is the active power on the high voltage side, U2I2*cosθ is the active power on the low voltage side, I0% is the percentage of the no-load current of the distribution transformer, U k % is the percentage of short-circuit impedance voltage of distribution transformer, P 损 is the total active power loss of the distribution transformer, P A is the active power loss of phase A, P B is the active power loss of phase B, P C is the active power loss of phase B, T is the detection time, and ΔA is the energy lost during the detection time.

[0081] The present invention provides a method for analyzing the loss of a distribution transformer based on multi-parameter coordination. By monitoring the high-voltage side line current, the low-voltage side line current and the line voltage, the line voltage on the high-voltage side of the transformer is calculated, without the need for detection by professional detection equipment, thus avoiding dangerous operations in a high-voltage and high-current environment. Furthermore, the present invention corrects the high-voltage side line voltage by the low-voltage side load and the transformer operating temperature, thereby improving the accuracy of the high-voltage side line voltage and thus improving the calculation accuracy of the transformer loss.

[0082] Optionally, the method for analyzing distribution transformer losses based on multi-parameter coordination provided in an embodiment of the present invention further includes steps S201 - S202 after step S105 .

[0083] S201. Calculate the operating efficiency of the distribution transformer based on the transformer loss of each phase and the corrected line voltage and line current on the high voltage side of each phase of the distribution transformer.

[0084] As a possible implementation manner, step S201 can be specifically implemented as steps S2011-S2012.

[0085] S2011. Determine the apparent power of each phase of the distribution transformer based on the corrected line voltage and line current on the high voltage side of each phase of the distribution transformer.

[0086] S2012. Determine the operating efficiency of each phase of the distribution transformer based on the apparent power of each phase of the distribution transformer and the transformer loss of each phase.

[0087] S202. Based on the losses of each phase transformer and the operating efficiency of the distribution transformer, the operating state of the distribution transformer is adjusted to improve the energy efficiency of the distribution transformer.

[0088] As a possible implementation manner, step S202 can be specifically implemented as steps A11-A13.

[0089] A11. Based on the reactive power loss of each phase and the apparent power of each phase, calculate the reactive power loss rate of each phase.

[0090] A12. Determine the reactive power compensation target value based on the reactive power loss rate of each phase.

[0091] A13. Based on the reactive power compensation target value, adjust the input value of each phase compensation capacitor to improve the energy efficiency of the distribution transformer.

[0092] As a possible implementation manner, step S202 can be specifically implemented as steps A21-A23.

[0093] A21. Calculate the three-phase load imbalance rate of the distribution transformer based on the line current and line voltage of each phase on the high-voltage side and the low-voltage side of the distribution transformer, as well as the transformer loss of each phase.

[0094] A22. Based on the three-phase load imbalance rate of the distribution transformer, the three-phase load is matched and adjusted to obtain a matching result, which includes the distribution of the three-phase load after adjustment.

[0095] A23. Based on the matching results, adjust the load of each phase of the distribution transformer to improve the energy efficiency of the distribution transformer.

[0096] In this way, the present invention can adjust the operating state of the distribution transformer according to the calculated transformer loss and operating efficiency, thereby improving the energy efficiency of the distribution transformer.

[0097] Optionally, the method for analyzing distribution transformer losses based on multi-parameter coordination provided in an embodiment of the present invention further includes steps S301 - S303 after step S202 .

[0098] S301. Obtain operating data of distribution transformers in a historical period.

[0099] In some embodiments, the operating data includes the line voltage and line current of each phase on the low voltage side, the line current of each phase on the high voltage side, the operating temperature, and the operating efficiency of each phase.

[0100] S302. Based on the operation data in the historical period, with the operation efficiency of each phase as the dependent variable, and the line voltage and line current of each phase on the low-voltage side, and the line current and operating temperature of each phase on the high-voltage side as the independent variables, polynomial fitting is performed to obtain an operation efficiency prediction model.

[0101] S303: Predict the operating efficiency of the distribution transformer based on the operating efficiency prediction model.

[0102] In this way, the embodiment of the present invention can make real-time predictions on the operating efficiency of the distribution transformer through the operating efficiency prediction model, simplify the calculation process, and improve the real-time performance of the distribution transformer regulation.

[0103] Illustratively, the embodiment of the present invention provides a data example. Table 1 is field data, and Table 2, Table 3 and Table 4 are calculation results.

[0104] Table 1

[0105]

[0106]

[0107] Table 2

[0108] Scene 1 calculate actual error High voltage side A phase voltage (V) 5714.8066 5718.9366 0.000722162 High voltage side B phase voltage 5724.0375 5726.8869 0.000497548 High voltage side C phase voltage 5723.0581 5727.8738 0.000840748 Total loss(KW) 0.36884 0.38701 0.046949691 High voltage total active power (KW) 33.2 32.9 0.009036145 Transformer loss rate % 0.011109639 0.011763222 -0.058830297

[0109] Table 3

[0110] Scene 2 calculate actual error High voltage side A phase voltage (V) 5989 5940 0.004358029 High voltage side B phase voltage 5970 5930 0.003193814 High voltage side C phase voltage 5989 5966 0.000670017 Total loss(KW) 11.7 8 -0.074626866 High voltage total active power (KW) 744.9 741 0.005235602 Transformer loss rate % 0.015706806 0.010796221 0.312640576

[0111] Table 4

[0112]

[0113]

[0114] As shown in Tables 1 to 4, the control method for the distribution transformer provided in the embodiment of the present invention improves the accuracy of the distribution transformer loss calculation by calculating the high-voltage side line voltage and the transformer loss.

[0115] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0116] The following is an embodiment of the device of the present invention. For details not described in detail therein, reference may be made to the corresponding method embodiment described above.

[0117] Figure 4 The schematic diagram of the structure of a distribution transformer loss analysis device based on multi-parameter coordination provided by an embodiment of the present invention is shown. The analysis device 300 includes a communication module 301 and a processing module 302 .

[0118] The communication module 301 is used to monitor the line current on the high voltage side of each phase of the distribution transformer, the line voltage and line current on the low voltage side, and the operating temperature of the transformer.

[0119] The processing module 302 is used to perform polar coordinate decomposition based on the line voltage and line current on the low-voltage side of each phase of the distribution transformer and the short-circuit impedance of the transformer to determine the line voltage of each phase on the high-voltage side; determine the low-voltage side load based on the line voltage and line current on the low-voltage side; correct the line voltage of each phase on the high-voltage side based on the low-voltage side load and the operating temperature to obtain the corrected line voltage of each phase on the high-voltage side; determine the transformer loss of each phase based on the line voltage and line current on the low-voltage side of each phase of the distribution transformer and the corrected line voltage and line current on the high-voltage side, so as to realize multi-parameter loss analysis of the distribution transformer.

[0120] Figure 5 Schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. Figure 5 As shown, the electronic device 400 includes: a processor 401, a memory 402, and a computer program 403 stored in the memory 402 and executable on the processor 401. When the processor 401 executes the computer program 403, the steps in the above-mentioned method embodiments are implemented, for example Figure 3 Alternatively, when the processor 401 executes the computer program 403, the functions of each module / unit in the above-mentioned device embodiments are realized, for example, Figure 4 The functions of the communication module 301 and the processing module 302 are shown.

[0121] Exemplarily, the computer program 403 may be divided into one or more modules / units, which are stored in the memory 402 and executed by the processor 401 to implement the present invention. The one or more modules / units may be a series of computer program instruction segments that can implement specific functions, and the instruction segments are used to describe the execution process of the computer program 403 in the electronic device 400. For example, the computer program 403 may be divided into Figure 4 The communication module 301 and the processing module 302 are shown.

[0122] The processor 401 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0123] The memory 402 may be an internal storage unit of the electronic device 400, such as a hard disk or memory of the electronic device 400. The memory 402 may also be an external storage device of the electronic device 400, such as a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the electronic device 400. Further, the memory 402 may also include both an internal storage unit of the electronic device 400 and an external storage device. The memory 402 is used to store the computer program and other programs and data required by the terminal. The memory 402 may also be used to temporarily store data that has been output or is to be output.

[0124] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A method for analyzing distribution transformer loss based on multi-parameter coordination, characterized in that: include: Monitor the line current on the high voltage side of each phase of the distribution transformer, the line voltage and line current on the low voltage side, and the operating temperature of the distribution transformer; Based on the line voltage and line current on the low-voltage side of each phase of the distribution transformer and the short-circuit impedance of the transformer, polar coordinate decomposition is performed to determine the line voltage of each phase on the high-voltage side; Determining a low-voltage side load based on the line voltage and line current on the low-voltage side; Based on the low-voltage side load and the operating temperature, the line voltage of each phase on the high-voltage side is corrected to obtain a corrected line voltage of each phase on the high-voltage side; Based on the line voltage and line current on the low-voltage side of each phase of the distribution transformer, as well as the corrected line voltage and line current on the high-voltage side, the transformer loss of each phase is determined to realize multi-parameter loss analysis of the distribution transformer.

2. The method for analyzing distribution transformer loss based on multi-parameter coordination according to claim 1 is characterized in that: The method performs polar coordinate decomposition based on the line voltage and line current on the low-voltage side of each phase of the distribution transformer and the short-circuit impedance of the transformer to determine the line voltage of each phase on the high-voltage side, including: Determine the load power factor based on the line voltage and line current on the low voltage side; Based on the line voltage and line current on the low-voltage side, the transformer short-circuit impedance, and the load power factor, polar coordinate decomposition is performed to determine the line voltage on the high-voltage side.

3. The method for analyzing distribution transformer loss based on multi-parameter coordination according to claim 2 is characterized in that: The method of correcting the line voltage of each phase on the high-voltage side based on the low-voltage side load and the operating temperature to obtain the corrected line voltage of each phase on the high-voltage side includes: Determine the temperature rise load factor based on the real-time operating temperature and real-time load of the distribution transformer; Based on the temperature rise load factor, the high-voltage side line voltage is corrected to obtain a corrected line voltage of each phase on the high-voltage side.

4. The method for analyzing distribution transformer loss based on multi-parameter coordination according to claim 1 is characterized in that: The method of determining the transformer loss of each phase based on the line voltage and line current on the low voltage side of each phase of the distribution transformer and the corrected line voltage and line current on the high voltage side includes: Determine reactive power loss of each phase of the distribution transformer based on the rated capacity, no-load current percentage, short-circuit impedance voltage percentage, high-voltage side corrected line voltage and line current of the distribution transformer; Calculating the apparent power of each phase of the distribution transformer based on the corrected line voltage and line current on the high-voltage side of each phase of the distribution transformer; Determining the active power of each phase on the high-voltage side of the distribution transformer based on the apparent power of each phase and the reactive power loss of each phase; Determine the active power of each phase on the low-voltage side of the distribution transformer based on the line voltage and line current of each phase on the low-voltage side of the distribution transformer and the load power factor; Based on the active power of each phase on the high-voltage side of the distribution transformer and the active power of each phase on the low-voltage side, the active power loss of each phase of the distribution transformer is determined.

5. The method for analyzing distribution transformer loss based on multi-parameter coordination according to claim 1 is characterized in that: After determining the transformer loss of each phase based on the line voltage and line current on the low-voltage side of each phase of the distribution transformer and the corrected line voltage and line current on the high-voltage side to realize the multi-parameter loss analysis of the distribution transformer, the method further includes: Calculating the operating efficiency of the distribution transformer based on the transformer losses of each phase and the corrected line voltage and line current on the high voltage side of each phase of the distribution transformer; Based on the losses of the phase transformers and the operating efficiency of the distribution transformer, the operating state of the distribution transformer is adjusted to improve the energy efficiency of the distribution transformer.

6. The method for analyzing distribution transformer loss based on multi-parameter coordination according to claim 5 is characterized in that: The operation efficiency of the distribution transformer is calculated based on the transformer loss of each phase and the corrected line voltage and line current on the high-voltage side of each phase of the distribution transformer, including: Determine the apparent power of each phase of the distribution transformer based on the corrected line voltage and line current on the high voltage side of each phase of the distribution transformer; Based on the apparent power of each phase of the distribution transformer and the transformer loss of each phase, the operating efficiency of each phase of the distribution transformer is determined.

7. The method for analyzing distribution transformer loss based on multi-parameter coordination according to claim 5, characterized in that: The step of adjusting the operating state of the distribution transformer based on the losses of each phase transformer and the operating efficiency of the distribution transformer to improve the energy efficiency of the distribution transformer includes: Based on the reactive power loss of each phase and the apparent power of each phase, the reactive power loss rate of each phase is calculated; Determine reactive power compensation target value based on reactive power loss rate of each phase; Based on the reactive power compensation target value, the input value of the compensation capacitor of each phase is adjusted to improve the energy efficiency of the distribution transformer.

8. The method for analyzing distribution transformer loss based on multi-parameter coordination according to claim 5, characterized in that: The step of adjusting the operating state of the distribution transformer based on the losses of each phase transformer and the operating efficiency of the distribution transformer to improve the energy efficiency of the distribution transformer includes: Calculate the three-phase load unbalance rate of the distribution transformer based on the line current and line voltage of each phase on the high-voltage side and the low-voltage side of the distribution transformer, as well as the transformer loss of each phase; Based on the three-phase load imbalance rate of the distribution transformer, matching and adjusting the three-phase load to obtain a matching result, wherein the matching result includes the distribution of the three-phase load after adjustment; Based on the matching result, the load of each phase of the distribution transformer is adjusted to improve the energy efficiency of the distribution transformer.

9. The method for analyzing distribution transformer loss based on multi-parameter coordination according to claim 5, characterized in that: After adjusting the operating state of the distribution transformer based on the losses of the phase transformers and the operating efficiency of the distribution transformer to improve the energy efficiency of the distribution transformer, the method further includes: Acquire the operating data of the distribution transformer in the historical period, wherein the operating data includes the line voltage and line current of each phase on the low voltage side, the line current of each phase on the high voltage side, the operating temperature, and the operating efficiency of each phase; Based on the operation data in the historical period, the operation efficiency of each phase is taken as the dependent variable, and the line voltage and line current of each phase on the low voltage side, and the line current and operating temperature of each phase on the high voltage side are taken as the independent variables, and polynomial fitting is performed to obtain an operation efficiency prediction model; Based on the operation efficiency prediction model, the operation efficiency of the distribution transformer is predicted.

10. A distribution transformer loss analysis device based on multi-parameter coordination, characterized in that: include: A communication module for monitoring the line current on the high-voltage side of each phase of the distribution transformer, the line voltage and line current on the low-voltage side, and the operating temperature of the transformer; A processing module, for performing polar coordinate decomposition based on the line voltage and line current of each phase on the low-voltage side of the distribution transformer and the short-circuit impedance of the transformer, to determine the line voltage of each phase on the high-voltage side; Determine the load on the low-voltage side based on the line voltage and line current on the low-voltage side; correct the line voltage of each phase on the high-voltage side based on the load on the low-voltage side and the operating temperature to obtain a corrected line voltage of each phase on the high-voltage side; Based on the line voltage and line current on the low-voltage side of each phase of the distribution transformer, as well as the corrected line voltage and line current on the high-voltage side, the transformer loss of each phase is determined to realize multi-parameter loss analysis of the distribution transformer.

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