A high and low voltage distribution cabinet control method and system

Abstract

The invention discloses a control method and system for high and low voltage distribution cabinets, and relates to the technical field of distribution cabinets, comprising: real-time monitoring of the coordinates of maintenance personnel and distribution cabinets in a distribution room; selecting any point P in the distribution room as an observation point, and obtaining the magnetic induction intensity of the current distribution cabinet at the observation point P according to the phase difference between three-phase busbars; calculating the enhancement factor and the weakening factor of the metal obstacle, traversing each distribution cabinet in the distribution room, and obtaining the total magnetic induction intensity generated at the observation point P; dividing the distribution room space into a plurality of grid units, marking the grid units whose magnetic induction intensity exceeds a safety threshold, calculating the relative distance between the maintenance personnel and the center point of the marked grid unit, and when the relative distance is less than the safety distance, obtaining the adjustment amount of current and phase to adjust the distribution cabinet, and performing dynamic adjustment according to the real-time position of the maintenance personnel, thereby realizing intelligent control and management of the distribution cabinet.

Description

Technical Field

[0001] The present invention relates to the technical field of power distribution cabinets, and in particular to a control method and system for high and low voltage power distribution cabinets. Background Art

[0002] In the power system, high and low voltage distribution cabinets are key equipment for power distribution and control, and their operating status is directly related to the safety and stability of the power system. With the increasing complexity and intelligence level of the power system, higher requirements are placed on the monitoring and management of distribution cabinets. Traditional distribution cabinet control methods mostly rely on manual inspections and regular maintenance, which have problems such as low efficiency and delayed response, and it is difficult to meet the safety and reliability requirements of modern power systems.

[0003] In the operation and maintenance management of the distribution room, the safety of maintenance personnel is the primary consideration. However, due to the presence of a large number of electrical equipment and high-intensity electromagnetic fields in the distribution room, maintenance personnel face potential risks such as electric shock and electromagnetic radiation during their operations. Traditional safety monitoring methods, such as setting up safety warning signs and installing surveillance cameras, have improved safety to a certain extent, but cannot evaluate the electromagnetic environment of maintenance personnel in real time and accurately, and thus cannot effectively prevent safety hazards such as excessive electromagnetic radiation.

[0004] In addition, the current size and phase relationship of the three-phase bus in the distribution cabinet directly affect the electromagnetic field distribution of the distribution room. During the design and operation and maintenance of the distribution room, it is necessary to accurately measure and calculate the magnetic induction intensity generated by the distribution cabinet to evaluate its impact on the surrounding environment. However, traditional measurement methods mostly rely on manual handheld instruments for fixed-point measurement, which is not only inefficient but also difficult to fully reflect the electromagnetic field distribution of the distribution room. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies in the prior art, the present invention provides a control method and system for high and low voltage distribution cabinets. By real-time monitoring of the coordinate information of maintenance personnel and distribution cabinets, the magnetic induction intensity generated by the distribution cabinets is accurately calculated, and the influence of metal obstacles is taken into account to accurately evaluate the electromagnetic field in the distribution room. At the same time, the method also divides the distribution room space into grids according to the changing gradient of the electromagnetic field, and dynamically adjusts it according to the real-time position of the maintenance personnel, thereby realizing intelligent control and management of the distribution cabinet, which not only improves the safety and reliability of the distribution room, but also reduces the operation and maintenance costs, and has important practical application value.

[0007] (II) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: A high and low voltage distribution cabinet control method, comprising:

[0009] Select any fixed point in the power distribution room as the origin to establish a coordinate system, and use the positioning device to obtain the coordinates of the maintenance personnel and the power distribution cabinet in the power distribution room;

[0010] Measure the current of the three-phase bus in the distribution cabinet, select any point P in the distribution room as the observation point, obtain the magnetic induction intensity generated by each phase bus at the observation point P, and perform vector synthesis of the magnetic induction intensity generated by the three-phase bus at the observation point according to the phase difference between the three-phase bus, and obtain the magnetic induction intensity of the current distribution cabinet at the observation point P;

[0011] When a metal obstacle exists, an electromagnetic field model including the metal obstacle is established using electromagnetic field simulation software, the enhancement factor and weakening factor of the metal obstacle are calculated, and each distribution cabinet in the distribution room is traversed to obtain the total magnetic induction intensity generated at the observation point P;

[0012] The distribution room space is divided into several grid units, and the magnetic induction intensity of the observation point in each grid unit is calculated. The size of the grid unit is adjusted according to the change gradient of the magnetic induction intensity between adjacent grid units. If the magnetic induction intensity of the current grid unit exceeds the safety threshold, the current grid unit is marked, otherwise, no processing is performed;

[0013] According to the real-time coordinates of the maintenance personnel, the relative distance between the maintenance personnel and the center point of the marked grid unit is calculated. When the relative distance between the maintenance personnel and the center point of the marked grid unit is less than the safety distance, the adjustment amount of current and phase is obtained to adjust the distribution cabinet.

[0014] Furthermore, the magnetic induction intensity generated by each phase bus at the observation point P is obtained, including:

[0015] For each phase bus, it is considered to be composed of several current elements. For each current element on the bus, the magnetic induction intensity element generated at the observation point P is calculated. The calculation formula is as follows:

[0016] ;in, represents the magnetic induction intensity element, represents the magnetic permeability in vacuum, It indicates the magnitude of the current on the current element. represents the length vector of the current element, represents the position vector from the current element to the observation point, r represents The module length;

[0017] Integrate all current elements on each phase bus to obtain the magnetic induction intensity generated by the bus at the observation point P: ,in, It represents the magnetic induction intensity generated by busbar i at observation point P, i represents the phase difference of busbar, .

[0018] Furthermore, according to the phase difference between the three-phase busbars, the magnetic induction intensity generated by the three-phase busbars at the observation point P is vector-synthesized to obtain the magnetic induction intensity of the current distribution cabinet at the observation point P: ,in, represents the magnetic induction intensity of the kth distribution cabinet at the observation point P, Indicates the number of the distribution cabinet. It indicates the magnitude of magnetic induction intensity. represents the phase angle, Represents an imaginary unit.

[0019] Furthermore, the total magnetic induction intensity generated at the observation point P is obtained, including:

[0020] Run the electromagnetic field simulation software to simulate the electromagnetic field model, record the magnetic induction intensity at the observation point P when there is a metal obstacle, and similarly, record the magnetic induction intensity at the observation point P when there is no metal obstacle, and calculate the enhancement factor and attenuation factor of the metal obstacle: , where S represents the enhancement factor and the attenuation factor, It represents the magnetic induction intensity at the observation point P when a metal obstacle exists. It represents the magnetic induction intensity at the observation point P when there is no metal obstacle.

[0021] Furthermore, a vector initialized to zero is set to accumulate the magnetic induction intensity generated by all distribution cabinets at the observation point P, which is recorded as , where 0 represents the zero vector. In the presence of metal obstacles, traverse each distribution cabinet in the distribution room and calculate the magnetic induction intensity generated by each distribution cabinet at the observation point P: , the magnetic induction intensity generated by the current distribution cabinet at the observation point P Add to total magnetic induction intensity On, that is .

[0022] Furthermore, the distribution room space is divided into several grid units, and the magnetic induction intensity of the observation point in each grid unit is calculated, including:

[0023] Set an initial reference grid unit size, use 3D modeling software or meshing tools to divide the distribution room space into several grid units according to the reference grid unit size, select the center point of each grid unit as the observation point, and calculate the total magnetic induction intensity of each observation point.

[0024] Furthermore, the size of the grid cells is adjusted according to the change gradient of the magnetic induction intensity between adjacent grid cells, including:

[0025] According to the calculated total magnetic induction intensity, numerical differentiation is used to calculate the change gradient of the magnetic induction intensity between adjacent grid cells, and a gradient threshold is set in advance. When the change gradient of the magnetic induction intensity between adjacent grid cells exceeds the gradient threshold, the grid cell is divided into a high gradient area; when the change gradient of the magnetic induction intensity between adjacent grid cells exceeds the gradient threshold, the grid cell is divided into a low gradient area.

[0026] Furthermore, the base grid cell size in the high gradient area is reduced to 50% of the initial size, and the high gradient area is redivided into several grid cells according to the reduced base grid cell size. The magnetic induction intensity data of the grid cells are interpolated, and linear interpolation is used to fill the blank areas between the grid cells.

[0027] Further, the adjustment amount of current and phase is determined, including:

[0028] Obtain the coordinates of all distribution cabinets, calculate the relative distance between the maintenance personnel and each distribution cabinet, and select the distribution cabinet with the shortest relative distance; for the selected distribution cabinet, calculate the electromagnetic induction intensity under different current and phase adjustments, set the objective function, use the optimization algorithm to solve the objective function, and obtain the current and phase adjustment. The calculation formula is as follows:

[0029] ;

[0030] in, , Respectively represent The current and phase of the iteration, α represents the learning rate, , They represent the partial derivatives of the objective function F with respect to current and phase respectively.

[0031] A high and low voltage distribution cabinet control system, comprising:

[0032] Positioning module: select any fixed point in the power distribution room as the origin to establish a coordinate system, and use positioning equipment to obtain the coordinates of the maintenance personnel and the power distribution cabinet in the power distribution room;

[0033] The magnetic induction analysis module measures the current of the three-phase bus in the distribution cabinet, selects any point P in the distribution room as the observation point, obtains the magnetic induction intensity generated by each phase bus at the observation point P, and performs vector synthesis of the magnetic induction intensity generated by the three-phase bus at the observation point according to the phase difference between the three-phase bus, and obtains the magnetic induction intensity of the current distribution cabinet at the observation point P; when there is a metal obstacle, the electromagnetic field simulation software is used to establish an electromagnetic field model containing the metal obstacle, calculate the enhancement factor and attenuation factor of the metal obstacle, traverse each distribution cabinet in the distribution room, and obtain the total magnetic induction intensity generated at the observation point P;

[0034] The area division module divides the distribution room space into several grid units, calculates the magnetic induction intensity of the observation point in each grid unit, and adjusts the size of the grid unit according to the change gradient of the magnetic induction intensity between adjacent grid units. If the magnetic induction intensity of the current grid unit exceeds the safety threshold, the current grid unit is marked, otherwise, no processing is performed;

[0035] The control module calculates the relative distance between the maintenance personnel and the center point of the marked grid unit according to the real-time coordinates of the maintenance personnel. When the relative distance between the maintenance personnel and the center point of the marked grid unit is less than the safety distance, the adjustment amount of the current and phase is obtained to adjust the distribution cabinet.

[0036] (III) Beneficial effects

[0037] The present invention provides a high and low voltage distribution cabinet control method and system, which has the following beneficial effects:

[0038] (1) By measuring the current of the three-phase bus in the distribution cabinet and considering the specific position of the bus, the total magnetic induction intensity at any point P in the distribution room can be accurately calculated. This method is more accurate than the traditional estimation method and can provide more reliable electromagnetic induction intensity data.

[0039] (2) Accurately mapping the metal obstacles in the distribution room and using electromagnetic field simulation software to establish an electromagnetic field model that includes these obstacles can more accurately reflect the actual situation, thereby improving the accuracy of electromagnetic field calculations. Metal obstacles may form a focal point or shielding layer of the electromagnetic field, which has a significant impact on the distribution of the electromagnetic field. By calculating the enhancement factor and attenuation factor of metal obstacles, we can more clearly understand how these obstacles change the distribution of the electromagnetic field.

[0040] (3) By dividing the distribution room space into several grid units and calculating the magnetic induction intensity of the observation point in each grid unit, it is possible to achieve refined management of the electromagnetic field in the distribution room, which can more accurately reflect the distribution of the electromagnetic field and help discover potential electromagnetic field safety hazards.

[0041] (4) By real-time monitoring of the electromagnetic field strength in the distribution room and marking grid cells that exceed the safety threshold, potential safety hazards can be discovered in a timely manner. When maintenance personnel approach these dangerous areas, the current and phase are automatically adjusted to reduce the intensity of the electromagnetic field and keep it within a safe range, thereby improving the overall safety of the distribution system and preventing personnel from being harmed by electromagnetic radiation. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of the steps of the high and low voltage distribution cabinet control method of the present invention;

[0043] Figure 2 It is a schematic diagram of the structure of the high and low voltage distribution cabinet control system of the present invention. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] See also Figure 1 The present invention provides a high and low voltage distribution cabinet control method, comprising the following steps:

[0046] Step 1: Select any fixed point in the power distribution room as the origin to establish a coordinate system, use the positioning device to obtain the coordinates of the maintenance personnel and the power distribution cabinet in the power distribution room, and transmit the coordinate information;

[0047] The step 1 includes the following contents:

[0048] Step 101: Select any fixed point in the power distribution room as the origin to establish a coordinate system, for example, a corner, a center point, or a position that is easy to identify and locate in the power distribution room, wherein the X-axis and Y-axis of the coordinate system are parallel to the length and width of the power distribution room respectively, and the Z-axis is perpendicular to the ground and points to the ceiling;

[0049] Step 102: Use a positioning device (such as an RFID tag, an infrared sensor, etc.) to measure the position of the maintenance personnel in the power distribution room. Similarly, use a positioning device to measure the position of the power distribution cabinet in the power distribution room, record the coordinate value of each power distribution cabinet, and transmit the obtained real-time coordinates of the maintenance personnel and the coordinates of the power distribution cabinet for subsequent analysis and processing;

[0050] Example: Using RFID tags for positioning:

[0051] Each maintenance worker is equipped with an RFID tag, which is fixed on the maintenance worker's helmet, work clothes or work badge. Before the RFID tag is assigned to the maintenance worker, the tag is initialized, including recording the tag's unique identifier (UID) and basic information related to the maintenance worker (such as name, work number, etc.);

[0052] Arrange multiple RFID readers in the power distribution room to ensure that the coverage of the readers can cover the entire power distribution room area. Connect the RFID readers to the local area network or wireless network of the power distribution room to ensure that data can be transmitted in real time. When maintenance personnel carry RFID tags into the power distribution room, the RFID tags are automatically recognized by nearby RFID readers.

[0053] After the RFID reader reads the maintenance personnel's RFID tag information, it transmits the data to the subsequent module. The subsequent processing module updates the maintenance personnel's location information in the power distribution room in real time based on the received data.

[0054] When using, combine the contents of step 101 to step 102:

[0055] By establishing a distribution room coordinate system, the positions of maintenance personnel and distribution cabinets in the distribution room can be accurately measured and recorded, which helps to better understand the positions and dynamics of maintenance personnel. The coordinate information of maintenance personnel and distribution cabinets can be transmitted and recorded to provide basic data for subsequent data analysis.

[0056] Step 2: Measure the current of the three-phase bus in the distribution cabinet, select any point P in the distribution room as the observation point, obtain the magnetic induction intensity generated by each phase bus at the observation point P, and perform vector synthesis of the magnetic induction intensity generated by the three-phase bus at the observation point according to the phase difference between the three-phase bus to obtain the magnetic induction intensity of the current distribution cabinet at the observation point P;

[0057] The step 2 comprises the following steps:

[0058] Step 201: Measure the current flowing through the three-phase bus in the power distribution cabinet, denoted as I A ,I B ,I C (For a balanced three-phase system, I A =I B =I C , the phase difference is 120 degrees), obtain the position of the three-phase bus, including direction, height and coordinates;

[0059] Step 202: Select any point P in the distribution room as an observation point, determine the coordinates (x, y, z) of point P, and for each phase bus, regard it as consisting of a number of current elements. For each current element on the bus, use the Biot-Savart Law to calculate the magnetic induction intensity element generated at the observation point P. The calculation formula is as follows:

[0060] ;in, represents the magnetic induction intensity element, represents the magnetic permeability in vacuum, It indicates the magnitude of the current on the current element. represents the length vector of the current element, represents the position vector from the current element to the observation point, r represents The module length;

[0061] It should be noted that the Biot-Savart law is a basic law in electromagnetism, which describes the magnetic field generated by a current element at any point in space. The Biot-Savart law is applicable to the calculation of the magnetic field generated by a stable current, that is, the current is the charge flowing continuously through a wire, the current does not change with time, and the charge does not accumulate or disappear at any position;

[0062] Step 203: Integrate all current elements on the bus to obtain the magnetic induction intensity generated by the bus at the observation point P: ,in, It represents the magnetic induction intensity generated by busbar i at observation point P, i represents the phase difference of busbar, .

[0063] Step 204: According to the phase difference between the three-phase busbars, the magnetic induction intensity generated by the three-phase busbars at the observation point P is vector-synthesized to obtain the magnetic induction intensity of the current distribution cabinet at the observation point P: ,in, represents the magnetic induction intensity of the kth distribution cabinet at the observation point P, It indicates the magnitude of magnetic induction intensity. represents the phase angle, j represents the imaginary unit;

[0064] For example: According to the phase difference between the three-phase busbars (120 degrees), when the three-phase current is a balanced system, , , , the magnetic induction intensity generated by the three-phase bus at the observation point P is vector synthesized. Since the three-phase current is alternating current, their magnetic induction intensity is in complex form, including magnitude (module length) and phase angle. The formula for vector synthesis is expressed as: ,in are respectively the complex forms of the magnetic induction intensity generated by the three-phase bus at the observation point P, and are synthesized using complex number addition operations, for example:

[0065] , and then synthesize using the rules of complex number addition:

[0066] ,in, , , It indicates the magnitude of magnetic induction intensity (module length), and k indicates the number of the distribution cabinet;

[0067] When used, combine the contents of step 201 to step 204:

[0068] By measuring the current of the three-phase bus in the distribution cabinet and considering the specific position of the bus, the total magnetic induction intensity at any point P in the distribution room can be accurately calculated. This method is more accurate than traditional estimation methods and can provide more reliable electromagnetic induction intensity data.

[0069] Step 3: When a metal obstacle exists, use electromagnetic field simulation software to establish an electromagnetic field model containing the metal obstacle, calculate the enhancement factor and weakening factor of the metal obstacle, traverse each distribution cabinet in the distribution room, and obtain the total magnetic induction intensity generated at the observation point P;

[0070] The step three includes the following contents:

[0071] Step 301: mapping the metal obstacles in the power distribution room, recording the position, size, shape and material of each obstacle, and using electromagnetic field simulation software (such as MATLAB, COMSOL Multiphysics, etc.) or a numerical method based on Maxwell's equations to establish an electromagnetic field model including the metal obstacles;

[0072] Step 302: Run the electromagnetic field simulation software to simulate the electromagnetic field model, record the magnetic induction intensity at the observation point P when the metal obstacle exists, and similarly record the magnetic induction intensity at the observation point P when there is no metal obstacle, and calculate the enhancement factor and attenuation factor of the metal obstacle: , where S represents the enhancement factor and attenuation factor (when S is greater than or equal to 1, it is an enhancement factor, and when S is less than 1, it is an attenuation factor). It represents the magnetic induction intensity at the observation point P when a metal obstacle exists. It represents the magnetic induction intensity at the observation point P when there is no metal obstacle;

[0073] Step 303: Set a vector initialized to zero to accumulate the magnetic induction intensity generated by all distribution cabinets at the observation point P, denoted as , where 0 represents the zero vector. In the presence of metal obstacles, traverse each distribution cabinet in the distribution room and calculate the magnetic induction intensity generated by each distribution cabinet at the observation point P: , the magnetic induction intensity generated by the current distribution cabinet at the observation point P Add to total magnetic induction intensity On, that is ;

[0074] It should be noted that in actual situations, an independent enhancement factor will not be directly assigned to each distribution cabinet. Instead, the comprehensive impact of obstacles in the entire distribution room will be considered. The enhancement or weakening effect of metal obstacles is usually not isolated, but intertwined and works together. Therefore, when calculating the total magnetic induction intensity, the impact of all obstacles needs to be considered comprehensively.

[0075] When used, combine the contents of step 301 to step 303:

[0076] Accurately mapping the metal obstacles in the distribution room and using electromagnetic field simulation software to establish an electromagnetic field model that includes these obstacles can more accurately reflect the actual situation, thereby improving the accuracy of electromagnetic field calculations. Metal obstacles may form a focal point or shielding layer of the electromagnetic field, which has a significant impact on the distribution of the electromagnetic field. By calculating the enhancement factor and attenuation factor of metal obstacles, we can more clearly understand how these obstacles change the distribution of the electromagnetic field.

[0077] Step 4: Divide the distribution room space into several grid units, calculate the magnetic induction intensity of the observation point in each grid unit, and adjust the size of the grid unit according to the change gradient of the magnetic induction intensity between adjacent grid units. If the magnetic induction intensity of the current grid unit exceeds the safety threshold, mark the current grid unit, otherwise, do not process it;

[0078] The step 4 includes the following contents:

[0079] Step 401: Set an initial reference grid unit size, use 3D modeling software or grid division tools to divide the distribution room space into a number of grid units according to the reference grid unit size, select the center point or a representative point of each grid unit as an observation point, and use the method in steps 2 and 3 to calculate the total magnetic induction intensity of each observation point;

[0080] It should be noted that a relatively moderate reference grid unit size is set according to the size and shape of the distribution room and the expected electromagnetic field analysis requirements. This size should balance the calculation accuracy and calculation efficiency without being too precise or strict.

[0081] Step 402: Calculate the change gradient of the magnetic induction intensity between adjacent grid cells using numerical differentiation or difference method according to the calculated total magnetic induction intensity, pre-set the gradient threshold, and adjust the grid cell size according to the change gradient of the electromagnetic field, including:

[0082] A gradient threshold is set in advance. When the gradient of the change of the magnetic induction intensity between adjacent grid cells exceeds the gradient threshold, the grid cell is divided into a high gradient area; when the gradient of the change of the magnetic induction intensity between adjacent grid cells exceeds the gradient threshold, the grid cell is divided into a low gradient area;

[0083] It should be noted that the gradient threshold is set based on the analysis of the electromagnetic field distribution and the determination of the variation range. The gradient threshold can reflect the significance of the electromagnetic field variation so as to divide the grid cells into high gradient areas and low gradient areas. The gradient threshold can be determined by empirical formula, expert judgment or statistical method.

[0084] Step 403: reducing the size of the reference grid cell in the high gradient area to a certain proportion of the initial size (e.g., reducing it to 50% or less), re-dividing the high gradient area into a plurality of grid cells according to the reduced size of the reference grid cell, interpolating the magnetic induction intensity data of the grid cells, and filling the blank areas between the grid cells (i.e., the grid cells where the magnetic induction intensity is not calculated) using linear interpolation, quadratic interpolation, cubic interpolation or other interpolation methods (e.g., radial basis function interpolation, Kriging interpolation, etc.);

[0085] Step 404: pre-set a safety threshold of magnetic induction intensity, compare the magnetic induction intensity of each grid unit with the safety threshold, if the magnetic induction intensity of the current grid unit exceeds the safety threshold, then there is a safety hazard in the area, and the current grid unit is marked; otherwise, there is no safety hazard in the area, and no processing is performed;

[0086] It should be noted that the setting of safety thresholds should give priority to personnel safety, which is usually obtained based on a large number of scientific experiments and data analysis, and can ensure the safety of personnel and equipment under the condition that the safety threshold is not exceeded, and ensure that personnel working in an electromagnetic field environment will not suffer health damage;

[0087] When used, combine the contents of step 401 to step 404:

[0088] By dividing the distribution room space into several grid units and calculating the magnetic induction intensity of the observation point in each grid unit, refined management of the electromagnetic field in the distribution room can be achieved, which can more accurately reflect the distribution of the electromagnetic field and help discover potential electromagnetic field safety hazards.

[0089] Step 5: Calculate the relative distance between the maintenance personnel and the center point of the marked grid unit based on the maintenance personnel's real-time coordinates. When the relative distance between the maintenance personnel and the center point of the marked grid unit is less than the safety distance, determine the adjustment amount of current and phase and adjust the distribution cabinet.

[0090] The step five includes the following contents:

[0091] Step 501: obtaining the real-time coordinates of the maintenance personnel, and using the distance formula to calculate the relative distance between the maintenance personnel and the center point of the marked grid unit according to the real-time coordinates of the maintenance personnel;

[0092] Step 502: pre-set a safety distance (e.g., 0.5 m or 1 m, a safety distance set to prevent maintenance personnel from entering the marked grid unit). When the relative distance between the maintenance personnel and the center point of the marked grid unit is greater than or equal to the safety distance, no processing is performed. When the relative distance between the maintenance personnel and the center point of the marked grid unit is less than the safety distance, obtain the coordinates of all distribution cabinets, use the distance formula to calculate the relative distance between the maintenance personnel and each distribution cabinet, and select the distribution cabinet with the shortest relative distance.

[0093] Step 503: For the selected distribution cabinet, calculate the electromagnetic induction intensity under different current and phase adjustments, set the objective function (such as reducing the electromagnetic induction intensity of the marked grid unit to below the safety threshold), use the optimization algorithm to solve the objective function, obtain the current and phase adjustment, and adjust the distribution cabinet according to the current and phase adjustment. The calculation formula of the current and phase adjustment is as follows:

[0094] ;

[0095] in, , Respectively represent The current and phase of the iteration, α represents the learning rate, , Respectively represent the partial derivatives of the objective function F with respect to current and phase;

[0096] When used, combine the contents of step 501 to step 503:

[0097] By real-time monitoring of the electromagnetic field strength in the distribution room and marking grid units that exceed the safety threshold, potential safety hazards can be discovered in a timely manner. When maintenance personnel approach these dangerous areas, the current and phase are automatically adjusted to reduce the intensity of the electromagnetic field and keep it within a safe range, thereby improving the overall safety of the distribution system and preventing people from being harmed by electromagnetic radiation.

[0098] See also Figure 2The present invention also provides a high and low voltage distribution cabinet control system, including: a position positioning module, a magnetic induction analysis module, an area division module and a control module; wherein the position positioning module selects any fixed point in the distribution room as the origin to establish a coordinate system, and uses a positioning device to obtain the coordinates of the maintenance personnel and the distribution cabinet in the distribution room;

[0099] The magnetic induction analysis module measures the current of the three-phase bus in the distribution cabinet, selects any point P in the distribution room as the observation point, obtains the magnetic induction intensity generated by each phase bus at the observation point P, and performs vector synthesis of the magnetic induction intensity generated by the three-phase bus at the observation point according to the phase difference between the three-phase bus, and obtains the magnetic induction intensity of the current distribution cabinet at the observation point P; when there is a metal obstacle, the electromagnetic field simulation software is used to establish an electromagnetic field model containing the metal obstacle, calculate the enhancement factor and attenuation factor of the metal obstacle, traverse each distribution cabinet in the distribution room, and obtain the total magnetic induction intensity generated at the observation point P;

[0100] The area division module divides the distribution room space into several grid units, calculates the magnetic induction intensity of the observation point in each grid unit, and adjusts the size of the grid unit according to the change gradient of the magnetic induction intensity between adjacent grid units. If the magnetic induction intensity of the current grid unit exceeds the safety threshold, the current grid unit is marked, otherwise, no processing is performed;

[0101] The control module calculates the relative distance between the maintenance personnel and the center point of the marked grid unit according to the real-time coordinates of the maintenance personnel. When the relative distance between the maintenance personnel and the center point of the marked grid unit is less than the safety distance, the adjustment amount of the current and phase is obtained to adjust the distribution cabinet.

[0102] In the application, the several formulas involved are all calculated by removing dimensions and taking their numerical values. The formula is a formula of the most recent real situation obtained by collecting a large amount of data and performing software simulation. The coefficients in the formula are set by technicians in this field according to actual conditions.

[0103] The above embodiments may be implemented in whole or in part by software, hardware, firmware or any other combination thereof. When implemented by software, the above embodiments may be implemented in whole or in part in the form of a computer program product. A person of ordinary skill in the art may appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein may be implemented in combination with electronic hardware, 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.

[0104] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, and may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0105] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application.

Claims

1. A high and low voltage distribution cabinet control method, characterized in that: include: Select any fixed point in the power distribution room as the origin to establish a coordinate system, and use the positioning device to obtain the coordinates of the maintenance personnel and the power distribution cabinet in the power distribution room; Measure the current of the three-phase bus in the distribution cabinet, select any point P in the distribution room as the observation point, obtain the magnetic induction intensity generated by each phase bus at the observation point P, and perform vector synthesis of the magnetic induction intensity generated by the three-phase bus at the observation point according to the phase difference between the three-phase bus, and obtain the magnetic induction intensity of the current distribution cabinet at the observation point P; When a metal obstacle exists, an electromagnetic field model including the metal obstacle is established using electromagnetic field simulation software, the enhancement factor and weakening factor of the metal obstacle are calculated, and each distribution cabinet in the distribution room is traversed to obtain the total magnetic induction intensity generated at the observation point P; The distribution room space is divided into several grid units, and the magnetic induction intensity of the observation point in each grid unit is calculated. The size of the grid unit is adjusted according to the change gradient of the magnetic induction intensity between adjacent grid units. If the magnetic induction intensity of the current grid unit exceeds the safety threshold, the current grid unit is marked, otherwise, no processing is performed; According to the real-time coordinates of the maintenance personnel, the relative distance between the maintenance personnel and the center point of the marked grid unit is calculated. When the relative distance between the maintenance personnel and the center point of the marked grid unit is less than the safe distance, the adjustment amount of the current and phase is obtained to adjust the distribution cabinet; Get current and phase adjustments, including: Obtain the coordinates of all distribution cabinets, calculate the relative distance between the maintenance personnel and each distribution cabinet, and select the distribution cabinet with the shortest relative distance; for the selected distribution cabinet, calculate the electromagnetic induction intensity under different current and phase adjustments, set the objective function, use the optimization algorithm to solve the objective function, and obtain the current and phase adjustment. The calculation formula is as follows: Among them, I k ,φ k denote the current and phase of the kth iteration respectively, α denotes the learning rate, They represent the partial derivatives of the objective function F with respect to current and phase respectively.

2. A high and low voltage distribution cabinet control method according to claim 1, characterized in that: The magnetic induction intensity generated by each phase bus at the observation point P is obtained, including: For each phase bus, it is considered to be composed of several current elements. For each current element on the bus, the magnetic induction intensity element generated at the observation point P is calculated. The calculation formula is as follows: in, represents the magnetic induction intensity microelement, μ0 represents the magnetic permeability in vacuum, I represents the current magnitude on the current element, represents the length vector of the current element, represents the position vector from the current element to the observation point, r represents The module length; Integrate all current elements on each phase bus to obtain the magnetic induction intensity generated by the bus at the observation point P: in, It represents the magnetic induction intensity generated by busbar i at observation point P, i represents the phase of busbar, i=A, B, C.

3. A high and low voltage distribution cabinet control method according to claim 2, characterized in that: According to the phase difference between the three-phase busbars, the magnetic induction intensity generated by the three-phase busbars at the observation point P is vector-synthesized to obtain the magnetic induction intensity of the current distribution cabinet at the observation point P: in, represents the magnetic induction intensity of the kth distribution cabinet at the observation point P, k represents the number of the distribution cabinet, B i Indicates the magnitude of magnetic induction intensity, θ i represents the phase angle, and j represents the imaginary unit.

4. A high and low voltage distribution cabinet control method according to claim 1, characterized in that: The total magnetic induction intensity generated at the observation point P is obtained, including: Run the electromagnetic field simulation software to simulate the electromagnetic field model, record the magnetic induction intensity at the observation point P when there is a metal obstacle, and similarly, record the magnetic induction intensity at the observation point P when there is no metal obstacle, and calculate the enhancement factor and weakening factor of the metal obstacle: S = B obs / B no_obs , where S represents the enhancement factor and the attenuation factor, B obs It represents the magnetic induction intensity at the observation point P when there is a metal obstacle, B no_obs It represents the magnetic induction intensity at the observation point P when there is no metal obstacle.

5. A high and low voltage distribution cabinet control method according to claim 4, characterized in that: Set a vector initialized to zero to accumulate the magnetic induction intensity generated by all distribution cabinets at the observation point P, denoted as Where 0 represents the zero vector. In the presence of metal obstacles, traverse each distribution cabinet in the distribution room and calculate the magnetic induction intensity generated by each distribution cabinet at the observation point P: The magnetic induction intensity generated by the current distribution cabinet at the observation point P Add to total magnetic induction intensity On, that is 6. A high and low voltage distribution cabinet control method according to claim 1, characterized in that: The distribution room space is divided into several grid units, and the magnetic induction intensity of the observation point in each grid unit is calculated, including: Set an initial reference grid unit size, use 3D modeling software or meshing tools to divide the distribution room space into several grid units according to the reference grid unit size, select the center point of each grid unit as the observation point, and calculate the total magnetic induction intensity of each observation point.

7. A high and low voltage distribution cabinet control method according to claim 6, characterized in that: According to the change gradient of magnetic induction intensity between adjacent grid cells, the size of the grid cells is adjusted, including: According to the calculated total magnetic induction intensity, numerical differentiation is used to calculate the change gradient of the magnetic induction intensity between adjacent grid cells, and a gradient threshold is set in advance. When the change gradient of the magnetic induction intensity between adjacent grid cells exceeds the gradient threshold, the grid cell is divided into a high gradient area; when the change gradient of the magnetic induction intensity between adjacent grid cells exceeds the gradient threshold, the grid cell is divided into a low gradient area.

8. A high and low voltage distribution cabinet control method according to claim 7, characterized in that: The base grid cell size in the high gradient area is reduced to 50% of the initial size, and the high gradient area is redivided into several grid cells according to the reduced base grid cell size. The magnetic induction intensity data of the grid cells are interpolated, and linear interpolation is used to fill the blank areas between the grid cells.

9. A high and low voltage distribution cabinet control system, used to implement the method described in any one of claims 1 to 8, characterized in that: include: Positioning module: select any fixed point in the power distribution room as the origin to establish a coordinate system, and use positioning equipment to obtain the coordinates of the maintenance personnel and the power distribution cabinet in the power distribution room; The magnetic induction analysis module measures the current of the three-phase bus in the distribution cabinet, selects any point P in the distribution room as the observation point, obtains the magnetic induction intensity generated by each phase bus at the observation point P, and performs vector synthesis of the magnetic induction intensity generated by the three-phase bus at the observation point according to the phase difference between the three-phase bus, and obtains the magnetic induction intensity of the current distribution cabinet at the observation point P; when there is a metal obstacle, the electromagnetic field simulation software is used to establish an electromagnetic field model containing the metal obstacle, calculate the enhancement factor and attenuation factor of the metal obstacle, traverse each distribution cabinet in the distribution room, and obtain the total magnetic induction intensity generated at the observation point P; The area division module divides the distribution room space into several grid units, calculates the magnetic induction intensity of the observation point in each grid unit, and adjusts the size of the grid unit according to the change gradient of the magnetic induction intensity between adjacent grid units. If the magnetic induction intensity of the current grid unit exceeds the safety threshold, the current grid unit is marked, otherwise, no processing is performed; The control module calculates the relative distance between the maintenance personnel and the center point of the marked grid unit according to the real-time coordinates of the maintenance personnel. When the relative distance between the maintenance personnel and the center point of the marked grid unit is less than the safe distance, the adjustment amount of the current and phase is obtained to adjust the power distribution cabinet; Get current and phase adjustments, including: Obtain the coordinates of all distribution cabinets, calculate the relative distance between the maintenance personnel and each distribution cabinet, and select the distribution cabinet with the shortest relative distance; for the selected distribution cabinet, calculate the electromagnetic induction intensity under different current and phase adjustments, set the objective function, use the optimization algorithm to solve the objective function, and obtain the current and phase adjustment. The calculation formula is as follows: Among them, I k ,φ k denote the current and phase of the kth iteration respectively, α denotes the learning rate, They represent the partial derivatives of the objective function F with respect to current and phase respectively.

Images