Distribution network loss calculation and correction method and device

Abstract

The application is suitable for the technical field of power distribution network, and provides a power distribution network loss calculation and correction method and device. The method comprises the following steps: calculating a first loss of a power distribution line according to a first fundamental current and a first harmonic current of the power distribution line, and calculating a second loss of a power distribution transformer according to a second fundamental current and a second harmonic current of the power distribution transformer; determining a line loss adjustment factor based on the active power of each load, and determining a power distribution transformer loss adjustment factor according to the current temperature of the power distribution transformer; adjusting the first loss and the second loss respectively according to the adjustment factors, determining the power distribution network loss, and adjusting the power distribution network according to the power distribution network loss. The application considers the influence of harmonic factors on the power distribution line and the power distribution transformer, and considers the influence of the power change of the terminal load on the power distribution line and the influence of the temperature on the power distribution transformer, so that the accuracy and efficiency of the power distribution network loss calculation can be improved, and then the effective adjustment of the power distribution network can be realized based on the power distribution network loss.

Description

Technical Field

[0001] The present application relates to the technical field of distribution network technology, and in particular to a method and device for calculating and correcting distribution network losses. Background Art

[0002] Distribution network loss is the main part of the energy loss of the power system. It comprehensively reflects the planning and design, production operation and economic management level of the distribution network. Accurately calculating the distribution network loss is of great guiding significance for reducing distribution network loss, reducing power transmission loss and improving power supply capacity.

[0003] The inventors have discovered that in related technologies, power flow calculation methods and root mean square (RMS) calculation methods are commonly used to determine distribution network losses. However, for distribution networks, accurate power flow calculation requires a large amount of data, which is computationally intensive and time-consuming, making it impossible to quickly calculate distribution network losses. The latter method is typically performed under power frequency conditions. For example, in the patent application with application publication number CN114677241A, only data under power frequency conditions were considered when calculating distribution network losses, while the impact of other factors on distribution network losses was ignored. This results in inaccurate calculations, and inability to provide effective guidance for reducing distribution network losses, or effectively adjust the distribution network. Summary of the Invention

[0004] In view of this, an embodiment of the present application provides a method and device for calculating and correcting distribution network losses to solve the technical problem that the relevant technology has low accuracy and low efficiency in calculating distribution network losses, and is unable to effectively adjust the distribution network.

[0005] In a first aspect, an embodiment of the present application provides a method for calculating and correcting distribution network losses, comprising:

[0006] Obtain the first fundamental current and first harmonic current of the distribution line in the distribution network, the second fundamental current, second harmonic current and current temperature of the distribution transformer, and the active power of each load;

[0007] Calculating a first loss of the distribution line according to the first fundamental current and the first harmonic current, and calculating a second loss of the distribution transformer according to the second fundamental current and the second harmonic current;

[0008] Determine the line loss adjustment factor based on the active power of each load and the distribution transformer loss adjustment factor based on the current temperature;

[0009] The first loss is adjusted according to the line loss adjustment factor, the second loss is adjusted according to the distribution transformer loss adjustment factor, and the distribution network loss is determined based on the adjusted first loss and the adjusted second loss, and the distribution network is adjusted according to the distribution network loss.

[0010] In one possible implementation, calculating a first loss of a distribution line according to a first fundamental current and a first harmonic current includes:

[0011] Calculate the distribution line loss based on the first fundamental current and the equivalent resistance of the distribution line;

[0012] Determine the first harmonic current based on the first fundamental current and the first harmonic content rate, and calculate the additional loss of the distribution line based on the first harmonic current and the equivalent resistance of the distribution line;

[0013] The sum of the distribution line loss and the distribution line additional loss is taken as the first loss.

[0014] In a possible implementation, calculating the second loss of the distribution transformer according to the second fundamental current and the second harmonic current includes:

[0015] Calculate the distribution transformer loss based on the second fundamental current, the equivalent resistance of the distribution transformer, and the no-load loss of the distribution transformer;

[0016] Based on the second fundamental current and the second harmonic content rate, the second harmonic current is determined, and the additional loss of the distribution transformer is calculated according to the second harmonic current and the equivalent resistance of the distribution transformer;

[0017] The sum of the distribution transformer loss and the distribution transformer additional loss is taken as the second loss.

[0018] In one possible implementation, determining a line loss adjustment factor based on the active power of each load includes:

[0019] According to the active power of each load, calculate the average value and effective value of the active power of each load respectively;

[0020] The line loss adjustment factor is determined based on the ratio of the effective value to the average value of the active power of each load.

[0021] In one possible implementation, determining a loss adjustment factor of a distribution transformer according to a current temperature includes:

[0022] Determine the temperature difference based on the current temperature and the standard temperature corresponding to the equivalent resistance of the distribution transformer;

[0023] Based on the temperature difference and a preset temperature coefficient, a loss adjustment factor of the distribution transformer is determined.

[0024] In one possible implementation, adjusting the first loss according to the line loss adjustment factor, adjusting the second loss according to the distribution transformer loss adjustment factor, and determining the distribution network loss based on the adjusted first loss and the adjusted second loss include:

[0025] a product of the line loss adjustment factor and the first loss as an adjusted first loss;

[0026] a product of the distribution transformer loss adjustment factor and the second loss as an adjusted second loss;

[0027] a sum of the adjusted first loss and the adjusted second loss as the distribution network loss.

[0028] In a possible implementation, an expression of the line loss adjustment factor is:

[0029]

[0030] wherein, F is the line loss adjustment factor, P n,rms is a root mean square value of the active power of the load n, P n,ave is a mean value of the active power of the load n, n = 1, 2, …, N, and N is determined according to the number of loads.

[0031] In a possible implementation, an expression of the distribution transformer loss adjustment factor is:

[0032] K = 1 + a (t - t0)

[0033] wherein, K is the distribution transformer loss adjustment factor, a is a preset temperature coefficient, t is a current temperature, and t0 is a standard temperature corresponding to an equivalent resistance of the distribution transformer.

[0034] In a second aspect, an embodiment of the present application provides a distribution network loss calculation and correction device, comprising:

[0035] an acquisition module configured to acquire a first fundamental current and a first harmonic current of a distribution line in a distribution network, a second fundamental current and a second harmonic current of a distribution transformer, a current temperature, and active power of each load.

[0036] a calculation module configured to calculate a first loss of the distribution line according to the first fundamental current and the first harmonic current, and calculate a second loss of the distribution transformer according to the second fundamental current and the second harmonic current.

[0037] a determination module configured to determine a line loss adjustment factor based on the active power of each load, and determine a distribution transformer loss adjustment factor according to the current temperature.

[0038] an adjustment module configured to adjust the first loss according to the line loss adjustment factor, adjust the second loss according to the distribution transformer loss adjustment factor, and determine a distribution network loss based on the adjusted first loss and the adjusted second loss, and adjust the distribution network according to the distribution network loss.

[0039] In a possible implementation, the calculation module is specifically configured to:

[0040] calculate the power distribution line loss according to the first fundamental current and the equivalent resistance of the power distribution line;

[0041] determine the first harmonic current based on the first fundamental current and the first harmonic content rate, and calculate the additional loss of the power distribution line according to the first harmonic current and the equivalent resistance of the power distribution line;

[0042] add the power distribution line loss and the additional loss of the power distribution line to obtain the first loss.

[0043] It can be understood that the beneficial effects of the above-mentioned second aspect can be referred to the related description in the above-mentioned first aspect, which will not be described here again.

[0044] The power distribution network loss calculation and correction method and device provided by the embodiments of the present application determine the first loss of the power distribution line according to the fundamental current and the harmonic current of the power distribution line in the power distribution network, determine the second loss of the power distribution line according to the fundamental current and the harmonic current of the power distribution transformer, adjust the first loss based on the line loss adjustment factor of the active power of each load in the power distribution network, adjust the second loss based on the power distribution transformer loss adjustment factor of the temperature of the power distribution transformer, and determine the power distribution network loss according to the adjusted first loss and second loss. According to the power distribution network loss, the power distribution network is adjusted. In the embodiments of the present application, the additional loss of the power distribution line and the additional loss of the power distribution transformer caused by the harmonic are accurately calculated, the first loss is adjusted based on the influence of the power change of each load on the power distribution line, the second loss is adjusted based on the temperature influence, and finally the power distribution network loss is determined using the above-mentioned small amount of data. The accuracy and efficiency of the power distribution loss calculation can be improved, and the power distribution network is adjusted based on the above-mentioned loss, which provides effective guidance for power distribution network loss reduction and the like.

[0045] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present specification. BRIEF DESCRIPTION OF DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description can only be some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0047] Figure 1 is a flowchart of the power distribution network loss calculation and correction method provided by an embodiment of the present application;

[0048] Figure 2It is a structural diagram of a distribution network loss calculation and correction device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0049] The present application will be described more clearly below with reference to specific embodiments. The following embodiments will help those skilled in the art further understand the function of the present application, but are not intended to limit the present application in any form. It should be noted that those skilled in the art may make a number of modifications and improvements without departing from the concept of the present application. These all fall within the scope of protection of the present application.

[0050] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections thereof.

[0051] It will also be understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0052] In the description of this application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0053] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0054] In addition, the “plurality” mentioned in the embodiments of the present application should be interpreted as two or more.

[0055] In response to the problems existing in the relevant technology, the inventors have found through research that, on the basis of the fundamental current, the influence of harmonic factors on the distribution lines and distribution transformers can be considered, and the influence of each terminal load on the distribution network and the influence of temperature on the distribution transformer can be considered at the same time. The line loss adjustment factor is calculated according to the active power of each load, and the distribution transformer adjustment factor is determined according to the current temperature of the distribution transformer. The loss is adjusted based on the above adjustment factors. Thus, the distribution network loss is obtained according to the adjusted distribution transformer loss and the adjusted distribution line loss, which can improve the accuracy and efficiency of the distribution network loss calculation, and then realize effective adjustment of the distribution network based on the distribution network loss.

[0056] Figure 1 This is a flow chart of a method for calculating and correcting distribution network losses provided in one embodiment of the present application.

[0057] like Figure 1 As shown, the method in the embodiment of the present application is applied to an electronic device, and the method may include:

[0058] Step 101: Acquire the first fundamental current and first harmonic current of the distribution line in the distribution network, the second fundamental current, second harmonic current and current temperature of the distribution transformer, and the active power of each load.

[0059] Exemplarily, in this embodiment, the first fundamental current and the first harmonic content of the distribution line are obtained, and the first harmonic current is determined based on the first fundamental current and the first harmonic content, and the second fundamental current and the second harmonic content of the distribution transformer are obtained, and the second harmonic current is determined based on the second fundamental current and the second harmonic content.

[0060] Optionally, in this embodiment, each load is a terminal load in the distribution network, and the active power of each load within a preset time period is obtained. For example, the active power of each load for each hour of a 24-hour day can be obtained. The current temperature of the distribution transformer can be the current average temperature of the distribution transformer, which can be obtained using a temperature sensor installed on the distribution transformer.

[0061] Step 102: Calculate a first loss of the distribution line according to the first fundamental current and the first harmonic current, and calculate a second loss of the distribution transformer according to the second fundamental current and the second harmonic current.

[0062] In one possible implementation, when determining the first loss of the distribution line, this embodiment can calculate the distribution line loss based on the first fundamental current and the equivalent resistance of the distribution line, determine the first harmonic current based on the first fundamental current and the first harmonic content, and calculate the additional loss of the distribution line based on the first harmonic current and the equivalent resistance of the distribution line. After that, the sum of the distribution line loss and the additional loss of the distribution line is taken as the first loss.

[0063] For example, this embodiment considers the impact of harmonics on distribution lines and calculates the harmonic losses of the distribution lines, i.e., the additional losses of the distribution lines, based on the harmonic currents of the distribution lines. Harmonics include the hth harmonic, where h = 2, ..., max, and max is the maximum harmonic order, such as 50. The first harmonic content includes the hth harmonic content of phases A, B, and C of the distribution lines. The first fundamental current includes the fundamental currents of phases A, B, and C of the distribution lines.

[0064] Optionally, the expression for the first loss is:

[0065] P1=P L +ΔP L

[0066] in,

[0067]

[0068]

[0069] Where, P1 is the first loss, P L is the distribution line loss, ΔP L is the additional loss of the distribution line, I XL is the first fundamental current, X=A, B, C, where I AL is the fundamental current of phase A of the distribution line, I BL is the fundamental current of phase B of the distribution line, I CL is the fundamental current of phase C of the distribution line, R L is the equivalent resistance of the distribution line, I Z is the fundamental current of the neutral line of the distribution network, R Z is the equivalent resistance of the neutral line of the distribution network; HRI XLh is the first harmonic content rate, where HRI ALh HRI is the hth harmonic content rate of phase A of the distribution line, BLh HRI is the hth harmonic content rate of phase B of the distribution line, CLh is the hth harmonic content rate of phase C of the distribution line, is the harmonic resistance adjustment coefficient, max is the maximum harmonic order, I XL HRI XLh is the first harmonic current, HRI Zh is the hth harmonic content of the neutral line of the distribution network.

[0070] In one possible implementation, when determining the second loss of the distribution transformer, the distribution transformer loss can be calculated according to the second fundamental current and the equivalent resistance of the distribution transformer, and the no-load loss of the distribution transformer, the second harmonic current can be determined based on the second fundamental current and the second harmonic content, and the additional loss of the distribution transformer can be calculated according to the second harmonic current and the equivalent resistance of the distribution transformer, and then the sum of the distribution transformer loss and the additional loss of the distribution transformer is taken as the second loss.

[0071] For example, in the embodiment, the influence of the harmonic on the distribution transformer is considered, the harmonic loss of the distribution transformer, that is, the additional loss of the distribution transformer, is calculated according to the harmonic current of the distribution transformer. The distribution transformer loss includes the no-load loss and the load loss, wherein the no-load loss is a fixed value related to the parameters of the distribution transformer, such as the no-load loss can be determined according to the magnetic flux density, the core weight and the material loss coefficient of the distribution transformer. The second fundamental current includes the fundamental current of the A phase, the B phase and the C phase of the distribution transformer. The second harmonic content includes the hth harmonic content of the A phase, the B phase and the C phase of the distribution transformer.

[0072] Optionally, the expression of the second loss is:

[0073] P2 = P F + ΔP T

[0074] wherein,

[0075]

[0076]

[0077] In the formula, P2 is the second loss, P is the distribution transformer loss, P0 is the no-load loss of the distribution transformer, ΔP is the additional loss of the distribution transformer, I is the second fundamental current, Y = A, B, C, I is the fundamental current of the A phase of the distribution transformer, I is the fundamental current of the B phase of the distribution transformer, I is the fundamental current of the C phase of the distribution transformer, R is the equivalent resistance of the distribution transformer; HRI is the second harmonic content, HRI is the hth harmonic content of the A phase of the distribution transformer, HRI is the hth harmonic content of the B phase of the distribution transformer, and HRI is the hth harmonic content of the C phase of the distribution transformer. F T YT AT BT CT T YTh ATh BTh CTh ​​​​​​​​​​​is the harmonic resistance adjustment coefficient, max is the maximum harmonic number, I YT HRI YTh is the second harmonic current.

[0078] The embodiment considers the influence of harmonics on power distribution network loss, accurately calculates the additional loss of the power distribution line and the additional loss of the power distribution transformer, that is, according to the three-phase harmonic current of the power distribution line, the additional loss of the power distribution line is calculated, according to the three-phase harmonic current of the power distribution transformer, the additional loss of the power distribution transformer is calculated, thereby obtaining the first loss and the second loss including the harmonic loss, which can improve the accuracy of the calculation of the power distribution network loss. At the same time, since the power distribution network loss is calculated using a small amount of data, the calculation time is short, and the calculation efficiency is improved.

[0079] Step 103, determine the line loss adjustment factor based on the active power of each load, and determine the power distribution transformer loss adjustment factor according to the current temperature.

[0080] Optionally, in the embodiment, the influence of each load on the power distribution line is determined according to the power change of each load, that is, the line loss adjustment factor is determined, so that the line loss adjustment factor can be used to adjust the calculated power distribution line loss, improve the accuracy of the power distribution line loss, and more accurately obtain the power distribution network loss. And since the equivalent resistance of the power distribution transformer is usually determined at a standard temperature, for example, 20℃, while the power distribution transformer is affected by the ambient temperature and the heat generated by the power distribution transformer during operation, the temperature of the power distribution transformer will change, thereby affecting the resistance value of the power distribution transformer. The embodiment also considers the influence of the current temperature of the power distribution transformer on the resistance of the power distribution transformer.

[0081] For example, when determining the line loss adjustment factor, the average value and the effective value of the active power of each load can be calculated according to the active power of each load, and then the line loss adjustment factor is determined based on the ratio of the effective value to the average value of the active power of each load.

[0082] Optionally, the expression of the line loss adjustment factor is:

[0083]

[0084] In the formula, F is the line loss adjustment factor, P n,rms is the effective value of the active power of load n, P n,ave is the average value of the active power of load n, n = 1, 2, …, N, N is determined according to the number of loads.

[0085] Wherein,

[0086]

[0087]

[0088] Where, P nt is the active power of load n at time t, t=1,2,…,T. For example, each day can be divided into 24 hours, and the interval between time t and time t+1 is 1 hour, T=24.

[0089] Illustratively, when determining the loss adjustment factor of the distribution transformer in this embodiment, the temperature difference can be determined based on the current temperature and the standard temperature corresponding to the equivalent resistance of the distribution transformer, and then the loss adjustment factor of the distribution transformer is determined based on the temperature difference and the preset temperature coefficient.

[0090] Optionally, the distribution transformer loss adjustment factor is expressed as:

[0091] K=1+α(t-t0)

[0092] Where K is the loss adjustment factor of the distribution transformer, α is the preset temperature coefficient, t is the current temperature, and t0 is the standard temperature corresponding to the equivalent resistance of the distribution transformer.

[0093] For example, since the equivalent resistance of a distribution line is typically determined at a standard temperature, this embodiment may also consider the impact of the current temperature of the distribution line on the resistance of the distribution line. A line temperature difference may be determined based on the current temperature of the distribution line and the standard temperature corresponding to the equivalent resistance of the distribution line. Subsequently, a distribution line resistance adjustment factor may be determined based on the line temperature difference and a preset line temperature coefficient. Consequently, the first loss is subsequently adjusted based on both the distribution line loss adjustment factor and the distribution line resistance adjustment factor.

[0094] Step 104: Adjust the first loss according to the line loss adjustment factor, adjust the second loss according to the distribution transformer loss adjustment factor, determine the distribution network loss based on the adjusted first loss and the adjusted second loss, and adjust the distribution network according to the distribution network loss.

[0095] Illustratively, when determining the distribution network loss in this embodiment, the product of the line loss adjustment factor and the first loss can be used as the adjusted first loss, the product of the distribution transformer loss adjustment factor and the second loss can be used as the adjusted second loss, and the sum of the adjusted first loss and the adjusted second loss can be used as the distribution network loss.

[0096] Optionally, the distribution network loss can be expressed as:

[0097] P=F·P1+K·P2

[0098] In the formula, P is the distribution network loss. In this embodiment, the distribution transformer loss adjustment factor is actually an adjustment of the equivalent resistance of the distribution transformer, and can also be understood as an adjustment of the loss (second loss) of the distribution transformer.

[0099] Here, after obtaining the above-mentioned distribution network losses, this embodiment can determine an adjustment plan based on the above-mentioned distribution network losses, and then adjust the distribution network based on the adjustment plan to reduce the distribution network losses. Optionally, after obtaining the above-mentioned distribution network losses, this embodiment determines the cause of the above-mentioned distribution network losses, and based on the cause, determines to adjust the operating state of the distribution network and / or determines the relevant parameters of the equipment in the distribution network that need to be adjusted, such as adjusting the operating voltage of the distribution network, adjusting the load curve, and balancing the three-phase load, thereby achieving effective adjustment of the distribution network.

[0100] The distribution network loss calculation and correction method provided in the embodiment of the present application determines the first loss of the distribution line based on the fundamental current and harmonic current of the distribution line in the distribution network, and determines the second loss of the distribution line based on the fundamental current and harmonic current of the distribution transformer. At the same time, the line loss adjustment factor is calculated based on the active power of each load in the distribution network to adjust the first loss, and the distribution transformer loss adjustment factor is determined based on the temperature of the distribution transformer to adjust the second loss. The distribution network loss is determined based on the adjusted first loss and second loss, and the distribution network is adjusted based on the distribution network loss. Among them, the embodiment of the present application accurately calculates the additional loss of the distribution line and the additional loss of the distribution transformer caused by harmonics, and adjusts the first loss based on the impact of the power change of each load on the distribution line, and adjusts the second loss based on the temperature impact. Finally, the distribution network loss is determined using the above small amount of data, which can improve the accuracy and efficiency of the distribution loss calculation. The distribution network is subsequently adjusted based on the above losses, providing effective guidance for reducing distribution network losses.

[0101] It should be understood that the size of the serial numbers of the steps in the above embodiments does not 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 embodiments of this application.

[0102] Figure 2 This is a schematic diagram of the structure of the distribution network loss calculation and correction device provided by an embodiment of the present application. Figure 2 As shown, the distribution network loss calculation and correction device provided by this embodiment may include: an acquisition module 201 , a calculation module 202 , a determination module 203 and an adjustment module 204 .

[0103] The acquisition module 201 is configured to acquire the first fundamental current and first harmonic current of the distribution line in the distribution network, the second fundamental current, second harmonic current and current temperature of the distribution transformer, and the active power of each load.

[0104] The calculation module 202 is configured to calculate a first loss of the distribution line according to the first fundamental current and the first harmonic current, and to calculate a second loss of the distribution transformer according to the second fundamental current and the second harmonic current.

[0105] The determination module 203 is configured to determine a line loss adjustment factor based on the active power of each load and determine a distribution transformer loss adjustment factor according to the current temperature.

[0106] The adjustment module 204 is used to adjust the first loss according to the line loss adjustment factor, adjust the second loss according to the distribution transformer loss adjustment factor, determine the distribution network loss based on the adjusted first loss and the adjusted second loss, and adjust the distribution network according to the distribution network loss.

[0107] Optionally, the calculation module 202 is specifically configured to:

[0108] Calculate the distribution line loss based on the first fundamental current and the equivalent resistance of the distribution line;

[0109] Determine the first harmonic current based on the first fundamental current and the first harmonic content rate, and calculate the additional loss of the distribution line based on the first harmonic current and the equivalent resistance of the distribution line;

[0110] The sum of the distribution line loss and the distribution line additional loss is taken as the first loss.

[0111] The calculation module 202 is further specifically configured to:

[0112] Calculate the distribution transformer loss based on the second fundamental current, the equivalent resistance of the distribution transformer, and the no-load loss of the distribution transformer;

[0113] Based on the second fundamental current and the second harmonic content rate, the second harmonic current is determined, and the additional loss of the distribution transformer is calculated according to the second harmonic current and the equivalent resistance of the distribution transformer;

[0114] The sum of the distribution transformer loss and the distribution transformer additional loss is taken as the second loss.

[0115] The determination module 203 is specifically configured to:

[0116] According to the active power of each load, calculate the average value and effective value of the active power of each load respectively;

[0117] The line loss adjustment factor is determined based on the ratio of the effective value to the average value of the active power of each load.

[0118] The determination module 203 is further specifically configured to:

[0119] Determine the temperature difference based on the current temperature and the standard temperature corresponding to the equivalent resistance of the distribution transformer;

[0120] Based on the temperature difference and a preset temperature coefficient, a loss adjustment factor of the distribution transformer is determined.

[0121] The adjustment module 204 is specifically used for:

[0122] The product of the line loss adjustment factor and the first loss is used as the adjusted first loss;

[0123] The product of the distribution transformer loss adjustment factor and the second loss is used as the adjusted second loss;

[0124] The sum of the adjusted first loss and the adjusted second loss is taken as the distribution network loss.

[0125] It should be noted that the information interaction, execution process, etc. between the above-mentioned devices / units are based on the same concept as the method embodiment of this application. Their specific functions and technical effects can be found in the method embodiment section and will not be repeated here.

[0126] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0127] Those skilled in the art will appreciate that the templates, units, and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present invention.

[0128] If the module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and when the computer program is executed by the processor, it can implement the steps of the above-mentioned various method embodiments. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device that can carry the computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory, random access memory, electric carrier signal, telecommunication signal and software distribution medium, etc.

[0129] 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 they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. A method for calculating and correcting distribution network losses, characterized in that: include: Obtain the first fundamental current and first harmonic current of the distribution line in the distribution network, the second fundamental current, second harmonic current and current temperature of the distribution transformer, and the active power of each load; Calculating a first loss of the distribution line according to the first fundamental current and the first harmonic current, and calculating a second loss of the distribution transformer according to the second fundamental current and the second harmonic current; Determining a line loss adjustment factor based on the active power of each load, and determining a distribution transformer loss adjustment factor based on the current temperature; Adjusting the first loss according to the line loss adjustment factor, adjusting the second loss according to the distribution transformer loss adjustment factor, determining a distribution network loss based on the adjusted first loss and the adjusted second loss, and adjusting the distribution network according to the distribution network loss; The line loss adjustment factor is expressed as follows: Where, F is the line loss adjustment factor, For load n The effective value of active power, For load n The average value of the active power, , N Determined by the amount of load; The expression of the distribution transformer loss adjustment factor is: Where, K is the distribution transformer loss adjustment factor, is the preset temperature coefficient, is the current temperature, It is the standard temperature corresponding to the equivalent resistance of the distribution transformer.

2. The method for calculating and correcting distribution network losses according to claim 1, wherein: The calculating the first loss of the distribution line according to the first fundamental current and the first harmonic current includes: Calculating a distribution line loss based on the first fundamental current and an equivalent resistance of the distribution line; Determining a first harmonic current based on the first fundamental current and the first harmonic content rate, and calculating an additional loss of the distribution line based on the first harmonic current and the equivalent resistance of the distribution line; The sum of the distribution line loss and the distribution line additional loss is taken as the first loss.

3. The method for calculating and correcting distribution network losses according to claim 1, wherein: The calculating the second loss of the distribution transformer according to the second fundamental current and the second harmonic current includes: Calculating the loss of the distribution transformer according to the second fundamental current, the equivalent resistance of the distribution transformer, and the no-load loss of the distribution transformer; Determining a second harmonic current based on the second fundamental current and the second harmonic content rate, and calculating an additional loss of the distribution transformer based on the second harmonic current and the equivalent resistance of the distribution transformer; The sum of the distribution transformer loss and the distribution transformer additional loss is used as the second loss.

4. The method for calculating and correcting distribution network losses according to any one of claims 1 to 3, characterized in that: The adjusting the first loss according to the line loss adjustment factor, adjusting the second loss according to the distribution transformer loss adjustment factor, and determining the distribution network loss based on the adjusted first loss and the adjusted second loss, includes: multiplying the line loss adjustment factor by the first loss as the adjusted first loss; multiplying the distribution transformer loss adjustment factor by the second loss as the adjusted second loss; The sum of the adjusted first loss and the adjusted second loss is used as the distribution network loss.

5. A distribution network loss calculation and correction device, characterized in that: include: An acquisition module is used to obtain the first fundamental current and first harmonic current of the distribution line in the distribution network, the second fundamental current, second harmonic current and current temperature of the distribution transformer, and the active power of each load; a calculation module, configured to calculate a first loss of the distribution line according to the first fundamental current and the first harmonic current, and calculate a second loss of the distribution transformer according to the second fundamental current and the second harmonic current; a determination module, configured to determine a line loss adjustment factor based on the active power of each load, and determine a distribution transformer loss adjustment factor according to the current temperature; an adjustment module, configured to adjust the first loss according to the line loss adjustment factor, adjust the second loss according to the distribution transformer loss adjustment factor, determine a distribution network loss based on the adjusted first loss and the adjusted second loss, and adjust the distribution network according to the distribution network loss; The line loss adjustment factor is expressed as follows: Where, F is the line loss adjustment factor, For load n The effective value of active power, For load n The average value of the active power, , N Determined by the amount of load; The expression of the distribution transformer loss adjustment factor is: Where, K is the distribution transformer loss adjustment factor, is the preset temperature coefficient, is the current temperature, It is the standard temperature corresponding to the equivalent resistance of the distribution transformer.

6. The distribution network loss calculation and correction device according to claim 5, characterized in that: The calculation module is specifically used for: Calculating a distribution line loss based on the first fundamental current and an equivalent resistance of the distribution line; Determining a first harmonic current based on the first fundamental current and the first harmonic content rate, and calculating an additional loss of the distribution line based on the first harmonic current and the equivalent resistance of the distribution line; The sum of the distribution line loss and the distribution line additional loss is taken as the first loss.

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