A Fault Detection Method and Device for AVC System Based on Spatiotemporal Model

Abstract

This application is applicable to the field of power technology, and provides a fault detection method and device for an AVC system based on a spatio-temporal model, including: receiving the bus voltages of high-voltage buses in a target power grid fed back by multiple acquisition devices based on a preset acquisition period; determining the initial reactive power consumption corresponding to the target power grid according to the grid impedance corresponding to the moment of collecting the bus voltages and all the bus voltages; constructing a time-domain reactive power change curve of the target power grid through the bus voltages and the initial reactive power consumption corresponding to each acquisition period; if the time-domain reactive power change curve meets a preset reactive power circulation condition, generating a fault prompt message; and performing reactive power compensation adjustment on the target power grid according to the fault handling process corresponding to the reactive power circulation condition. By using the above method, when the AVC device cannot normally offset the reactive power consumption in the target power grid, a corresponding fault prompt message can be generated to detect and repair the fault situation, improving the security of the target power grid.

Description

Technical Field

[0001] This application belongs to the field of power technology, and particularly relates to a fault detection method and device for an AVC system based on a spatio-temporal model. Background Art

[0002] Automatic Voltage Control (AVC) can remotely adjust the reactive power of the power grid where the substation is located, so that the bus voltage of the substation is stabilized within a certain range, and the power in the power grid meets the usage requirements. For example, the reactive power of each reactive device in the substation is automatically adjusted according to the preset bus voltage range of the substation, so that the bus voltage of the substation is stabilized within the preset bus voltage range.

[0003] However, the above AVC adjustment for the target power grid mainly relies on the AVC device to adjust the reactive power in the power grid. If the AVC device is abnormal or the parameter settings are inaccurate, it will cause the accumulation of reactive power in the power grid, thus affecting the safety of the target power grid. It can be seen that the existing AVC adjustment technology, which relies on the AVC device to adjust the reactive power, cannot detect abnormalities in the adjustment operation of the AVC device, thereby reducing the safety of the overall power grid. Summary of the Invention

[0004] The embodiments of this application provide a fault detection method and device for an AVC system based on a spatio-temporal model, which can solve the problem that the existing AVC adjustment technology, which relies on the AVC device to adjust the reactive power, cannot detect abnormalities in the adjustment operation of the AVC device and has low safety of the overall power grid.

[0005] In a first aspect, the embodiments of this application provide a fault detection method for an AVC system based on a spatio-temporal model, and the method includes:

[0006] Receiving the bus voltages of the high-voltage buses in the target power grid fed back by multiple acquisition devices based on a preset acquisition period;

[0007] Determining the initial reactive power consumption corresponding to the target power grid according to the grid impedance corresponding to the moment of collecting the bus voltages and all the bus voltages; the grid impedance is determined based on the spatial model corresponding to the target power grid;

[0008] Constructing a time-domain reactive power change curve of the target power grid through the bus voltages and the initial reactive power consumption corresponding to each acquisition period;

[0009] If the time-domain reactive power change curve meets the preset reactive power circulation condition, generating a fault prompt message;

[0010] According to the fault handling process corresponding to the reactive power circulation condition, perform reactive power compensation adjustment on the target power grid.

[0011] In a possible implementation manner of the first aspect, before determining the initial reactive power consumption corresponding to the target power grid according to the grid impedance corresponding to the moment of collecting the bus voltage and all the bus voltages, it further includes:

[0012] Obtain the scenario information corresponding to the target power grid; the scenario information includes: weather information and unit operation parameters;

[0013] According to the wind strength and rainfall in the weather information, determine the space floating coefficient; the space floating coefficient is specifically:

[0014]

[0015] where SpaceLv is the space floating coefficient; CableMax is the maximum value of the cable length in the target power grid; WindLv is the wind strength; UnitL is the reference unit length corresponding to the cable; RainFall is the rainfall; Time is the rainfall duration; RSpeed is the drainage speed;

[0016] Calibrate the initial model of the target power grid through the space floating coefficient to obtain a space-calibrated model;

[0017] Based on the power parameters of each in-use device recorded in the unit operation parameters, respectively adjust the object states of the first virtual objects corresponding to each in-use device in the space-calibrated model;

[0018] Take the space-calibrated model after adjusting the object states of the virtual objects as the space model.

[0019] In a possible implementation manner of the first aspect, the determining the initial reactive power consumption corresponding to the target power grid according to the grid impedance corresponding to the moment of collecting the bus voltage and all the bus voltages includes:

[0020] According to each bus voltage, adjust the object states of the second virtual objects of each high-voltage bus in the space model;

[0021] Based on the object states of all the second virtual objects and the input voltage corresponding to the target power grid at the moment of collecting the bus voltage, determine the voltage floating factor corresponding to the space model;

[0022] Perform parameter calibration on the bus voltage and the power parameters of each of the in-use devices by using the voltage floating factor to obtain a calibration voltage corresponding to the bus voltage and a calibration parameter corresponding to the power parameter;

[0023] According to the calibration voltages corresponding to all high-voltage buses and the calibration parameters, a grid impedance equation and a reactive power consumption equation corresponding to the target grid are constructed; the grid impedance equation is:

[0024]

[0025] Among them, X IMP is the grid impedance; U n The calibration voltage corresponding to the high-voltage bus obtained by the nth acquisition device; U m is the calibration parameter of the mth device in use set on the high-voltage bus; U Tagt is the target voltage corresponding to the high voltage bus; Q j is the initial reactive power consumption corresponding to the high voltage bus; Q Tagt is the reactive power offsetting power consumption corresponding to the high-voltage bus at the moment of collecting the bus voltage; α is a preset weighting coefficient; N is the total number of the collecting devices; M is the total number of the devices in use;

[0026] The reactive power consumption equation is:

[0027]

[0028] The reactive power consumption equation and the grid impedance equation are combined to calculate the initial reactive power consumption.

[0029] In a possible implementation manner of the first aspect, if the time-domain reactive power change curve satisfies a preset reactive circulating current condition, generating fault prompt information, and before performing reactive compensation adjustment on the target power grid according to a fault handling process corresponding to the reactive circulating current condition, the method further includes:

[0030] Based on a preset circulating current iteration time, the time domain reactive power variation curve is divided into a plurality of curve segments; the curve length corresponding to each curve segment is the circulating current iteration time;

[0031] According to the extreme values ​​of each initial reactive power consumption recorded in the curve segment, respectively determining the floating ratio corresponding to each curve segment;

[0032] The circulation confidence is calculated according to the floating ratio corresponding to each of the curve segments; the circulation confidence is:

[0033]

[0034] where Trust is the confidence level of the circulating current; Float q is the floating ratio corresponding to the q-th curve segment; Q is the total number of all curve segments in the time-domain reactive power change curve; Time q is the acquisition time corresponding to the q-th curve segment; Time Q is the time when the bus voltage is acquired;

[0035] If the confidence level of the circulating current is greater than a preset confidence threshold, it is recognized that the time-domain reactive power change curve meets the preset reactive power circulating condition.

[0036] In a possible implementation manner of the first aspect, after calculating the confidence level of the circulating current according to the floating ratios corresponding to the respective curve segments, it further includes:

[0037] If the confidence level of the circulating current is less than or equal to the confidence threshold, it is recognized that the time-domain reactive power change curve does not meet the reactive power circulating condition;

[0038] Perform power consumption calibration on the initial reactive power consumption according to the floating ratio corresponding to the Q-th curve segment to obtain the calibrated reactive power consumption;

[0039] Based on the calibrated reactive power consumption, control the AVC device to cancel the reactive power consumption of the target power grid.

[0040] In a possible implementation manner of the first aspect, the generating a fault prompt message if the time-domain reactive power change curve meets the preset reactive power circulating condition includes:

[0041] Determine a standby AVC device corresponding to the bus identifier according to the bus identifier of the high-voltage bus in the fault prompt message;

[0042] The performing reactive power compensation adjustment on the target power grid according to the fault handling process corresponding to the reactive power circulating condition includes:

[0043] If the standby AVC device is in an idle state, replace the in-use AVC device in the target voltage with the standby AVC device, so as to perform the fault handling process corresponding to the reactive power circulating condition through the standby AVC device to perform reactive power compensation adjustment on the target power grid.

[0044] In a possible implementation manner of the first aspect, in a possible implementation manner of the first aspect, the performing reactive power compensation adjustment on the target power grid according to the fault handling process corresponding to the reactive power circulating condition includes:

[0045] If the standby AVC device is in an occupied state, send device replacement information to the management user associated with the target power grid.

[0046] In a second aspect, an embodiment of the present application provides a fault detection device for an AVC system based on a spatio-temporal model. The device includes:

[0047] A bus voltage acquisition unit configured to receive the bus voltage of a high-voltage bus in a target power grid fed back by a plurality of acquisition devices based on a preset acquisition period;

[0048] An initial reactive power consumption determination unit configured to determine the initial reactive power consumption corresponding to the target power grid according to the power grid impedance corresponding to the moment when the bus voltage is acquired and all the bus voltages; the power grid impedance is determined based on the spatial model corresponding to the target power grid;

[0049] A unit configured to construct a time-domain reactive power change curve of the target power grid through the bus voltages and the initial reactive power consumption corresponding to each of the acquisition periods;

[0050] A fault prompt information generation unit configured to generate fault prompt information if the time-domain reactive power change curve meets a preset reactive power circulation condition;

[0051] A reactive power compensation unit configured to perform reactive power compensation adjustment on the target power grid according to a fault handling process corresponding to the reactive power circulation condition.

[0052] In a third aspect, an embodiment of the present application provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the method described in any item of the first aspect above is implemented.

[0053] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, the method described in any item of the first aspect above is implemented.

[0054] In a fifth aspect, an embodiment of the present application provides a computer program product, which, when running on an electronic device, causes the electronic device to execute the method described in any item of the first aspect above.

[0055] The beneficial effects of the embodiments of the present application compared with the prior art are as follows: By using a collection device to obtain the bus voltage of the high-voltage bus in the target power grid, a spatial model corresponding to the target power grid can be constructed. Then, based on the spatial model and the collected bus voltage, the initial reactive power consumption corresponding to the target voltage can be obtained. Subsequently, based on the initial reactive power consumption determined through collection in multiple collection cycles, the time-domain reactive power change curve corresponding to the target power grid can be obtained. Thus, it is possible to determine whether the time-domain reactive power change curve meets the preset reactive power circulation condition through this time-domain reactive power change curve, so as to determine whether there is an abnormality in the AVC device in the target power grid. When it is detected that the time-domain reactive power change curve meets the reactive power circulation condition, the corresponding fault response process is executed to achieve automatic detection of the AVC device abnormality. Compared with the existing AVC technology, in the embodiments of the present application, not only can the AVC device cancel the reactive power consumption in the target power grid, but also the fault and abnormality of the AVC device can be detected through the space-time model. Thus, when the AVC device cannot normally cancel the reactive power consumption in the target power grid, corresponding fault prompt information can be generated to detect and repair the fault situation, improving the safety of the target power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0057] Figure 1 is a schematic structural diagram of an AVC system provided by an embodiment of the present application;

[0058] Figure 2 is a schematic implementation diagram of a method for fault detection of an AVC system based on a space-time model provided by an embodiment of the present application;

[0059] Figure 3 is a schematic diagram of a time-domain reactive power change curve provided by an embodiment of the present application;

[0060] Figure 4 is a specific implementation flowchart of a method for fault detection of an AVC system based on a space-time model provided by the second embodiment of the present application before S202;

[0061] Figure 5 is a specific implementation flowchart of a method for fault detection of an AVC system based on a space-time model provided by the third embodiment of the present application at S202;

[0062] Figure 6It is a specific implementation flowchart after S203 of a fault detection method for an AVC system based on a spatio-temporal model provided by the fourth embodiment of the present application;

[0063] Figure 7 It is a specific implementation flowchart of a fault detection method for an AVC system based on a spatio-temporal model provided by the fifth embodiment of the present application in S205 and S206;

[0064] Figure 8 It is a schematic structural diagram of a fault detection device for an AVC system based on a spatio-temporal model provided by an embodiment of the present application;

[0065] Figure 9 It is a schematic structural diagram of an electronic device provided by an embodiment of the present application. Detailed implementation manners

[0066] In the following description, for the purpose of illustration rather than limitation, specific details such as specific system structures and technologies are proposed to thoroughly understand the embodiments of the present application. However, those skilled in the art should clearly understand that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present application.

[0067] It should be understood that when used in the specification and appended claims of the present application, the term "comprising" indicates the presence of the described features, wholes, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0068] In addition, in the description of the specification and appended claims of the present application, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0069] A fault detection method for an AVC system based on a spatio-temporal model provided by an embodiment of the present application can be applied to an AVC system. Exemplarily, Figure 1 shows a schematic structural diagram of an AVC system provided by an embodiment of the present application. Refer to Figure 1 As described, the AVC system includes a management device 11 for managing the reactive power of the target power grid, a collection device 12 deployed in the target power grid for collecting bus voltages, a power supply device 13 for providing an input voltage to the high-voltage bus, a power transformation device 14 for regulating the power of the target power grid, and an AVC device 15 for regulating the reactive power consumption of the target power grid.

[0070] Among them, the above-mentioned acquisition device 12 is arranged at each acquisition node in the high-voltage bus of the target power grid. For example, it is in the connection area between the high-voltage bus and the power supply device 13, or it can be in the connection area between the high-voltage bus and the power transformation device 14, or it can be at the midpoint of the high-voltage bus, etc. The specific way to set the acquisition device 12 can be set according to the actual situation and is not limited here.

[0071] In this embodiment, the above-mentioned power supply device 13 is connected to the high-voltage bus of the target power grid to transmit electric power through the high-voltage bus. Among them, the above-mentioned high-voltage bus can be placed in a high-voltage bus duct to reduce the number of power outages for maintenance. When transmitting a large current, it can eliminate the faults caused by unbalanced current distribution brought by using double or triple high-voltage cables. In some implementation manners, the high-voltage bus can also be deployed in the form of bare wires, so as to reduce the deployment cost, and this method is generally applied to outdoor long-distance transmission scenarios. It can be determined specifically according to the actual situation, and the deployment method of the high-voltage bus is not limited here.

[0072] In this embodiment, the power transformation device 14 is connected to the high-voltage bus of the target power grid and is used to convert the high-voltage electricity transmitted in the high-voltage bus into low-voltage electricity for users to use. During the voltage conversion process of the power supply device 13, the high-voltage bus, and the power transformation device 14, reactive power may be generated, thereby affecting the stability of the bus voltage. Based on this, the embodiment of the present application can control the AVC device 15 through the management device 11 to cancel the reactive power in the target power grid.

[0073] In this embodiment, the management device 11 is connected to each acquisition device 12 and receives the bus voltage feedback by each acquisition device 12. The management device 11 is also connected to the above-mentioned AVC device 15 to control the AVC device 15 to cancel the reactive power in the target power grid.

[0074] Please refer to Figure 2 , Figure 2 shows a schematic implementation diagram of a fault detection method for an AVC system based on a spatio-temporal model provided by an embodiment of the present application. The fault detection method for the AVC system based on the spatio-temporal model is applied to the above-mentioned management device 11. The execution subject of the embodiment of the present application can be the above-mentioned management device, and this management device can be any electronic device, and this electronic device can be a computer, a laptop, a server, etc. Specifically, the method includes the following steps:

[0075] In S201, based on a preset acquisition period, receive the bus voltages of the high-voltage buses in the target power grid feedback by multiple acquisition devices.

[0076] In this embodiment, the electronic device can be set with a corresponding acquisition period, and multiple acquisition times are set according to the acquisition period. When it is detected that the preset acquisition time is reached, the electronic device can receive the bus voltages of the high-voltage bus collected and fed back by each acquisition device deployed in the target power grid.

[0077] In some implementation manners, the above acquisition period can be determined according to the number of faults corresponding to the target power grid. If the total number of generated fault prompt messages corresponding to the target power grid is larger, the period duration of the corresponding acquisition period is shorter; on the contrary, if the total number of generated fault prompt messages corresponding to the target power grid is smaller, the period duration of the corresponding acquisition period is longer.

[0078] In some implementation manners, the electronic device can adjust the above acquisition period according to the device load corresponding to the target power grid; if the current load of the target power grid is higher, that is, there are more power-consuming devices, the corresponding acquisition period is shorter; on the contrary, if the current load of the target power grid is lower, that is, there are fewer power-consuming devices, the corresponding acquisition period is longer, and the electronic device can dynamically adjust the above acquisition period according to the actual power grid situation.

[0079] In this embodiment, one or more acquisition devices can be deployed on the high-voltage bus of the target power grid, and the bus voltage at the corresponding position of the high-voltage bus is obtained through this acquisition device. If multiple acquisition devices are deployed on one high-voltage bus, the average value of the bus voltages corresponding to the multiple acquisition devices can be used as the calibration voltage of the high-voltage bus; alternatively, the bus voltages of the high-voltage bus obtained by the multiple acquisition devices can be imported into a preset voltage correction algorithm to obtain the corresponding calibration voltage.

[0080] In S202, according to the power grid impedance corresponding to the acquisition time of the bus voltage and all the bus voltages, the initial reactive power consumption corresponding to the target power grid is determined; the power grid impedance is determined based on the spatial model corresponding to the target power grid.

[0081] In this embodiment, the electronic device can determine the power grid impedance corresponding to the target power grid according to the states of each high-voltage bus connected to the target power grid and the operating states of the in-use devices. Among them, if the number of in-use devices in the target power grid is larger, the corresponding power grid impedance is larger; the power grid impedance is also related to the boost ratio of the power supply device and the step-down ratio of the substation device. The electronic device can generate the spatial model corresponding to the target power grid according to the electrical parameters in multiple dimensions in the target power grid, and then simulate the operation situation of the target power grid through this spatial model, and then determine the power grid impedance corresponding to the acquisition time of the bus voltage during the acquisition period through this operation situation.

[0082] In this embodiment, the electronic device can import the calculated grid impedance and the bus voltage corresponding to the high-voltage bus in the target grid into a preset power consumption conversion algorithm, so as to calculate the reactive power consumption corresponding to the moment when the bus voltage is collected. Among them, the electronic device can convert the reactive power consumption into the reactive power corresponding to the target grid. Since the reactive power consumption is the accumulated power consumption within the acquisition period, therefore, the ratio between the reactive power consumption and the period duration corresponding to the acquisition period can be calculated to obtain the initial reactive power corresponding to the target grid.

[0083] In S203, a time-domain reactive power change curve of the target grid is constructed based on the bus voltage and the initial reactive power consumption corresponding to each acquisition period.

[0084] In this embodiment, the electronic device obtains an initial reactive power consumption corresponding to the target grid in each acquisition period, that is, each initial reactive power consumption is associated with a period identifier of an acquisition period. The electronic device can mark each initial reactive power consumption in a preset time-domain coordinate system according to the period identifier, and connect each initial reactive power consumption in sequence based on the acquisition order corresponding to the acquisition period, so as to obtain the corresponding time-domain reactive power change curve.

[0085] Exemplarily, Figure 3 shows a schematic diagram of a time-domain reactive power change curve provided by an embodiment of the present application. Refer to Figure 3 As shown, the vertical axis in the time-domain reactive power change curve is the power consumption value, and the horizontal axis is the acquisition period. The electronic device can determine the corresponding coordinate points in the above time-domain reactive power change curve according to the acquisition period corresponding to each initial reactive power consumption, and then connect each coordinate point in sequence according to the time domain order, so as to obtain the above time-domain reactive power change curve.

[0086] In this embodiment, the electronic device can obtain at least one time-domain characteristic value of the target grid according to the time-domain reactive power change curve. The time-domain characteristic value can be the extreme value of the reactive power consumption, the floating range corresponding to the reactive power consumption, the change rate of the reactive power consumption, and the change trend, etc. The number and type of specific time-domain characteristic values selected can be determined according to the actual situation.

[0087] In this embodiment, after determining multiple time domain characteristic values, the electronic device can match them with the reactive circulation conditions, so as to determine whether the target power grid is abnormal. Since the reactive power consumption in multiple high-voltage buses may constitute circuit circulation during the power transmission of the target power grid, the reactive power consumption that cannot be offset due to the abnormality of the AVC device will continue to accumulate during the transmission process, so that the proportion of this part of reactive power consumption is getting higher and higher, thereby affecting the stability and safety of the target power grid. It can be seen that the reactive power consumption accumulated due to the circuit circulation has a cumulative characteristic in the time domain. The electronic device can determine the time domain characteristic value corresponding to the reactive power consumption of the target power grid based on the constructed time domain reactive power consumption, and match the time domain characteristic value with the reactive circulation condition. If the two match, it is identified that the target power grid has an abnormal reactive circulation, and the operation of S204 is performed; on the contrary, if the two do not match, it is identified that the reactive power consumption of the target power grid is within the normal floating range. At this time, according to the initial reactive power consumption, the AVC device can be controlled to offset the power consumption of the target power grid to eliminate the reactive power consumption in the target power grid.

[0088] In some implementations, the reactive circulating current condition includes at least one characteristic range. If the time domain characteristic value corresponding to the time domain reactive change curve is within the characteristic range, the time domain reactive change curve is identified as satisfying the reactive circulating current condition, and the subsequent S204 operation is performed. The characteristic range may include an upper limit value and a lower limit value. If it is detected that the time domain characteristic value is less than the lower limit value or greater than the upper limit value, it is identified as being within the characteristic range, and the S204 operation is performed.

[0089] In S204, if the time-domain reactive power variation curve meets the preset reactive circulating current condition, fault prompt information is generated.

[0090] In this embodiment, if the electronic device detects that the time domain characteristic value in the above-mentioned time domain reactive power change curve is within the characteristic range corresponding to the reactive circulating current condition, it is determined that there is a loop circulating current in the target power grid, and reactive power is constantly accumulated in the loop circulating current, which is prone to loop abnormality and affects the safety of the target power grid. Based on this, the electronic device can generate corresponding fault prompt information to prompt the administrator of the target power grid to handle the fault event.

[0091] In some implementations, the electronic device may display the abnormal high-voltage bus in the target power grid in the above-mentioned fault prompt information, thereby facilitating the management personnel to locate the abnormal target bus and perform fault repair on the AVC device associated with the target bus.

[0092] In some implementations, multiple acquisition devices may be configured in the target busbar. Each acquisition device may correspond to a busbar voltage. The electronic device may determine an abnormal voltage based on the multiple busbar voltages, and use the installation location of the acquisition device corresponding to the abnormal voltage as the fault location on the high-voltage busbar. The electronic device may add the above fault location to the above fault prompt information, so as to facilitate the management user to quickly repair the fault at the fault location and improve the fault repair efficiency.

[0093] In S205, according to the fault handling process corresponding to the reactive power circulation condition, reactive power compensation adjustment is performed on the target power grid.

[0094] In this embodiment, the electronic device may be provided with multiple reactive power circulation conditions, and different reactive power circulation conditions correspond to a fault handling process. For example, one reactive power circulation condition is used to indicate that the voltage in the current target power grid is too low, and it may correspond to a fault handling process of boosting the high-voltage busbar in the target power grid; another reactive power circulation condition is used to indicate that the voltage in the current target power grid is too high, and it may correspond to a fault handling process of reducing the voltage of the high-voltage busbar in the target power grid; one reactive power circulation condition is used to indicate that the adjustment accuracy of the AVC device in the current target power grid is too low, and it may correspond to a fault handling process of replacing the AVC device in the target power grid. The electronic device may determine the corresponding fault handling process according to the reactive power circulation condition satisfied by the time-domain reactive power change curve, so as to respond to the fault event in the target power grid.

[0095] In this embodiment, after the electronic device repairs the fault situation, it may determine the reactive power of the target power grid after the fault is repaired, and control the AVC device in the target power grid to input a cancellation power with a phase opposite to the above reactive power into the target power grid, so as to cancel the reactive power in the target power grid.

[0096] As can be seen above, a fault detection method for the AVC system based on a spatio-temporal model provided by an embodiment of the present application obtains the bus voltage of the high-voltage bus in the target power grid through a collection device, so as to be able to construct a spatial model corresponding to the target power grid. Then, based on the spatial model and the collected bus voltage, the initial reactive power consumption corresponding to the target voltage is obtained. Then, based on the initial reactive power consumption determined by collection in multiple collection cycles, a time-domain reactive power change curve corresponding to the target power grid is obtained. Thus, it is possible to determine whether the time-domain reactive power change curve meets a preset reactive power circulation condition through the time-domain reactive power change curve, so as to determine whether there is an abnormality in the AVC device in the target power grid. And when it is detected that the time-domain reactive power change curve meets the reactive power circulation condition, a corresponding fault response process is executed to realize the automatic detection of the abnormality of the AVC device. Compared with the existing AVC technology, in the embodiment of the present application, not only can the reactive power consumption in the target power grid be offset by the AVC device, but also the AVC device can be detected for fault abnormalities through the spatio-temporal model. Thus, when the AVC device cannot normally offset the reactive power consumption in the target power grid, corresponding fault prompt information can be generated to detect and repair the fault situation, improving the safety of the target power grid.

[0097] Figure 4 FIG. shows a specific implementation flowchart of a fault detection method for the AVC system based on a spatio-temporal model provided by the second embodiment of the present application before S202. Refer to Figure 4 relative to Figure 2 the embodiment described above, before S202 in a fault detection method for the AVC system based on a spatio-temporal model provided by this embodiment, it further includes: S401 to S405, which are specifically described in detail as follows:

[0098] Furthermore, before determining the initial reactive power consumption corresponding to the target power grid according to the grid impedance corresponding to the moment of collecting the bus voltage and all the bus voltages, it further includes:

[0099] In S401, obtain the scenario information corresponding to the target power grid; the scenario information includes: weather information and unit operation parameters.

[0100] In this embodiment, some high-voltage buses in the target power grid are not deployed through bus ducts, and can be deployed in the form of bare wires to reduce the overall cost of the target power grid. In this case, the above high-voltage buses may be affected by environmental factors, resulting in a change in the reactive power in the target power grid. Based on this, in order to be able to construct a more accurate spatial model, the electronic device can obtain the scenario information corresponding to each high-voltage bus in the target power grid at a preset time interval. Optionally, the above time interval can be in days, that is, the scenario information can be obtained once a day, so that the spatial model of the target power grid can be updated every day.

[0101] Exemplarily, the target power grid includes three groups of high-voltage busbars, and the corresponding deployment positions of each group of high-voltage busbars are different. In this case, the electronic device can obtain the scenario information corresponding to the deployment position according to the deployment position corresponding to each high-voltage busbar respectively.

[0102] In this embodiment, the above scenario information includes weather information and unit operation parameters. Among them, the above weather information may include the wind force level and the corresponding rainfall amount at the location of the high-voltage busbar. Since the high-voltage busbars deployed outdoors may be affected by the wind, which affects the distance between different high-voltage busbars, thereby changing the impedance of the circuit where the high-voltage busbar is located, and there may also be voltage crosstalk and other situations due to too close a distance. The above unit operation parameters are specifically used to determine the operation parameters of the in-use equipment deployed on the target busbar. Since the use state of the in-use equipment will also change the impedance of the circuit where the high-voltage busbar is located, thereby affecting the calculation of subsequent reactive power consumption, therefore, the space model can be adjusted according to the unit operation parameters.

[0103] In S402, according to the wind force intensity and rainfall amount in the weather information, determine the space floating coefficient; the space floating coefficient is specifically:

[0104]

[0105] Among them, SpaceLv is the space floating coefficient; CableMax is the maximum value of the cable length in the target power grid; WindLv is the wind force intensity; UnitL is the reference unit length corresponding to the cable; RainFall is the rainfall amount; Time is the rainfall duration; RSpeed is the drainage speed.

[0106] In this embodiment, the electronic device can import the preset space floating conversion function according to the wind force intensity and rainfall amount included in the weather information, and calculate the space floating coefficient corresponding to the location of the high-voltage busbar. Among them, if the wind force intensity is stronger, the influence degree on the position of the high-voltage busbar is higher, and correspondingly, the value of the floating coefficient is larger. Among them, the longer the cable length of the high-voltage busbar, the higher the degree of influence by the wind. Therefore, the electronic device can calculate the wind force floating factor according to the cable length and wind force level of the high-voltage busbar; at the same time, the electronic device can also calculate the rainfall floating factor. If the rainfall speed is higher than the drainage speed at the location of the high-voltage busbar, that is, there is a situation of water accumulation, and the water accumulation will also have a certain impact on the electrical parameters. For example, electrical parameters such as the corresponding impedance and equivalent capacitance will change. Based on this, the electronic device can calculate the rainfall floating factor according to the relationship between the rainfall speed and the drainage speed. Finally, the electronic device calculates the space floating coefficient according to the wind force floating factor and the precipitation floating factor.

[0107] In some implementations, if the deployment positions corresponding to the above high-voltage busbars are different, the electronic device can determine the spatial floating coefficients corresponding to the positions where each high-voltage busbar is located according to different scenario information.

[0108] In S403, the initial model of the target power grid is calibrated through the spatial floating coefficient to obtain a spatially calibrated model.

[0109] In this embodiment, the electronic device can calibrate the initial model corresponding to the target power grid (i.e., the spatial model to be adjusted) according to the spatial floating coefficient. For example, the relative positions between each high-voltage busbar in the target power grid and the loop impedance corresponding to the target power grid are adjusted, so that the initial model calibrated based on the spatial floating coefficient is used as the spatial calibrated model for calculating the initial reactive power consumption.

[0110] In S404, based on the power parameters of each in-use device recorded by the unit operation parameters, the object states of the first virtual objects corresponding to each in-use device in the spatial calibrated model are respectively adjusted.

[0111] In S405, the spatial calibrated model after adjusting the object state of the virtual object is used as the spatial model.

[0112] In this embodiment, in addition to including each high-voltage busbar, the above spatial calibrated model can also be configured with the first virtual objects corresponding to each in-use device deployed on the high-voltage busbar. The electronic device can determine the power parameters corresponding to each in-use device according to the unit operation parameters of each in-use device collected. The above power parameters include but are not limited to: device voltage, device current, and device power, etc. The electronic device can adjust the object states corresponding to each second virtual object in the spatial calibrated model in real time according to the power parameters, so that the states of each in-use device in the spatial calibrated model are consistent with the actual situation, which is convenient for subsequent simulation of the grid impedance and reactive power consumption corresponding to the target power grid.

[0113] In this embodiment, the electronic device can calibrate the relative position relationship in the initial model according to the weather information and update the object states of the first virtual objects corresponding to each in-use device, so that the initial model after adjusting the above two items is used as the spatial model of the target power grid.

[0114] In the embodiments of the present application, by collecting scenario information to calibrate the initial model of the target power grid, the generated spatial model can be made more consistent with the actual situation, thereby improving the accuracy of subsequent initial reactive power consumption calculation.

[0115] Figure 5The figure shows a specific implementation flowchart of a method for fault detection of an AVC system based on a spatio-temporal model in S202 provided by the third embodiment of the present application. Refer to Figure 5 compared with Figure 4 the embodiment, a method for fault detection of an AVC system based on a spatio-temporal model provided in this embodiment in S202 includes: S2021 to S2025 are described in detail as follows:

[0116] Further, the determining the initial reactive power consumption corresponding to the target power grid according to the power grid impedance corresponding to the moment of collecting the bus voltage and all the bus voltages includes:

[0117] In S2021, according to each of the bus voltages, the object states of the second virtual objects of each of the high-voltage buses in the spatial model are adjusted.

[0118] In this embodiment, the electronic device can obtain the bus voltage corresponding to the high-voltage bus through the acquisition device, and update the object states of each high-voltage bus in the spatial model, that is, set the voltage value corresponding to the acquisition position of the high-voltage bus in the spatial model to the value of the collected bus voltage, so as to realize the object update of the second virtual object of the high-voltage bus in the spatial model.

[0119] In S2022, based on the object states of all the second virtual objects and the input voltage corresponding to the target power grid at the moment of collecting the bus voltage, the voltage fluctuation factor corresponding to the spatial model is determined.

[0120] In this embodiment, during the voltage transmission of the target power grid, the voltage values of the high-voltage buses collected at each position should be fixed. Therefore, the electronic device can compare the input voltage corresponding to the power supply device with the bus voltages collected at each position of the high-voltage bus, so as to calculate the voltage fluctuation factor corresponding to the target power grid. If the deviation values between the bus voltages collected at different positions and the input voltage are larger, the corresponding value of the voltage fluctuation factor is larger; conversely, if the deviation between the bus voltages collected at different positions and the input voltage is smaller, the corresponding value of the voltage fluctuation factor is smaller.

[0121] In S2023, the bus voltage and the power parameters of each of the in-use devices are calibrated by the voltage fluctuation factor to obtain the calibrated voltage corresponding to the bus voltage and the calibrated parameters corresponding to the power parameters.

[0122] In this embodiment, the electronic device can calibrate the bus voltage and the power parameters of each device in use according to the voltage floating factor. For example, if the above voltage floating factor is a negative number, the voltage value corresponding to each bus voltage can be reduced based on the voltage floating factor. Similarly, the power parameters of each device in use can be adjusted according to the corresponding adjustment method; correspondingly, if the voltage floating factor is a positive value, the voltage value corresponding to each bus voltage can be increased based on the voltage floating factor, so that after calibrating the above two parameters respectively, the calibrated voltage corresponding to the high-voltage bus and the calibrated parameters corresponding to the devices in use can be obtained.

[0123] In S2024, a grid impedance equation and a reactive power consumption equation corresponding to the target grid are constructed according to the calibration voltages corresponding to all high-voltage buses and the calibration parameters; the grid impedance equation is:

[0124]

[0125] Among them, X IMP is the grid impedance; U n The calibration voltage corresponding to the high-voltage bus obtained by the nth acquisition device; U m is the calibration parameter of the mth device in use set on the high-voltage bus; U Tagt is the target voltage corresponding to the high voltage bus; Q j is the initial reactive power consumption corresponding to the high voltage bus; Q Tagt is the reactive power offsetting power consumption corresponding to the high-voltage bus at the moment of collecting the bus voltage; α is a preset weighting coefficient; N is the total number of the collecting devices; M is the total number of the devices in use;

[0126] The reactive power consumption equation is:

[0127]

[0128] In S2025, the reactive power consumption equation and the grid impedance equation are combined to calculate the initial reactive power consumption.

[0129] In this embodiment, since the grid impedance in the target grid will be affected by reactive power, and the process of calculating reactive power also needs to use the grid impedance in the target grid, it is necessary to construct two equations, namely the grid impedance equation and the reactive power consumption equation, so as to combine the above two equations to calculate the grid impedance corresponding to the target grid, and based on the grid impedance, the initial reactive power consumption corresponding to the target grid can be calculated.

[0130] Among them, different from the prior art, when calculating the grid impedance and the initial reactive power consumption in the embodiments of the present application, the influence of the in-use equipment on the electrical disturbance of the target grid will be considered. Since the in-use equipment (such as acquisition equipment and other monitoring equipment) will cause a certain voltage drop on the high-voltage bus and introduce a certain impedance, in order to improve the accuracy of reactive power consumption calculation, when constructing the equation, the electronic device will reduce the influence of the above corresponding parameters, and then can improve the accuracy of the initial reactive power consumption calculation, thereby improving the accuracy of fault condition detection.

[0131] Figure 6 FIG. shows a specific implementation flowchart after S203 of a method for fault detection of an AVC system based on a spatio-temporal model provided in the fourth embodiment of the present application. Refer to Figure 6 , relative to Figure 2 the embodiment, after S203 of a method for fault detection of an AVC system based on a spatio-temporal model provided in this embodiment, it further includes: S601 to S604, which are specifically described in detail as follows:

[0132] Further, before generating a fault prompt message if the time-domain reactive power change curve satisfies a preset reactive power circulation condition and performing reactive power compensation adjustment on the target grid according to the fault handling process corresponding to the reactive power circulation condition, it further includes:

[0133] In S601, based on a preset circulation iteration duration, the time-domain reactive power change curve is divided into multiple curve segments; the curve length corresponding to each curve segment is the circulation iteration duration.

[0134] In this embodiment, there is a cumulative characteristic of loop circulation in the time domain. Therefore, the electronic device can set a corresponding circulation iteration duration for the loop circulation to divide the above time-domain reactive power change curve into multiple curve segments, and the curve length of each curve segment is determined based on the above circulation iteration duration. After the electronic device divides the time-domain reactive power change curve into curve segments, it can better determine whether there is a cumulative characteristic of reactive power consumption in different iteration periods in the time domain, and then can realize the fault detection of the target grid.

[0135] In S602, according to the extreme values of the respective initial reactive power consumptions recorded in the curve segment, the floating ratio corresponding to each curve segment is determined respectively.

[0136] In this embodiment, after the electronic device divides to obtain multiple curve segments, it can respectively perform statistical recognition of eigenvalues for each curve segment. Among them, the electronic device will determine the maximum value of the initial reactive power consumption and the minimum value of the initial reactive power consumption in the curve segment, so as to calculate the extreme value of the initial reactive power consumption corresponding to the curve segment according to the corresponding maximum value and minimum value in the curve segment, that is, Max-Min. The above Max is the maximum value of the initial reactive power consumption in the curve segment, and the above Mix is the minimum value of the initial reactive power consumption in the curve segment.

[0137] In this embodiment, after the electronic device calculates the extreme value of the initial reactive power consumption corresponding to the curve segment, based on the ratio between the mean value of the initial reactive power consumption in the curve segment and the above extreme value, it can determine the floating ratio corresponding to the curve segment. Correspondingly, each curve segment can calculate the corresponding floating ratio through the above method.

[0138] In S603, according to the floating ratios corresponding to each of the curve segments, calculate the loop current confidence level; the loop current confidence level is:

[0139]

[0140] where Trust is the loop current confidence level; Float q is the floating ratio corresponding to the q-th curve segment; Q is the total number of all curve segments in the time-domain reactive power change curve; Time q is the acquisition time corresponding to the q-th curve segment; Time Q is the moment when the bus voltage is acquired.

[0141] In this embodiment, the above loop current confidence level is specifically a piecewise function. Since the loop current in the circuit has cumulativeness in the time domain, that is, the degree of abnormality will continuously accumulate with the increase of time. Based on this, the fluctuation of the reactive power consumption will also continuously increase with the passage of time. Based on this, if the floating ratios corresponding to the previous loop current iteration period are all smaller than the floating ratios corresponding to the subsequent loop current iteration period, then the above time-domain advancement is satisfied, and thus the confidence level can be calculated in the manner of the first piecewise function; if the floating ratios of any two periods do not satisfy the progressive characteristic in the time domain, it means that there is no superposition of loop current of reactive power consumption in the target power grid, and thus the corresponding confidence level can be directly set to 0.

[0142] In S604, if the loop current confidence level is greater than a preset confidence level threshold, then identify that the time-domain reactive power change curve satisfies the preset reactive power loop condition.

[0143] In this embodiment, when the circulating current confidence level is greater than a preset confidence threshold, the electronic device may determine that there is an abnormal condition in the current target power grid, that is, when the time-domain reactive power change curve meets the preset reactive power circulating current condition, the subsequent fault response process may be executed.

[0144] Further, as another embodiment of the present application, after the above S603, the following steps may further be included:

[0145] In S605, if the circulating current confidence level is less than or equal to the confidence threshold, it is recognized that the time-domain reactive power change curve does not meet the reactive power circulating current condition.

[0146] In this embodiment, when it is detected that the circulating current confidence level is less than or equal to the confidence threshold, it means that there is no situation where the reactive power consumption iterates in the loop circulating current in the target power grid. In this case, it means that the time-domain reactive power change curve does not meet the reactive power circulating current condition, and there is no need to perform the fault response process.

[0147] In S606, according to the floating ratio corresponding to the Qth curve segment, the initial reactive power consumption is calibrated to obtain the calibrated reactive power consumption.

[0148] In S607, based on the calibrated reactive power consumption, the AVC device is controlled to cancel the reactive power consumption of the target power grid.

[0149] In this embodiment, the Qth curve segment is the curve segment where the initial reactive power consumption corresponding to the acquisition period at the current moment is located. Therefore, based on the floating ratio corresponding to the Qth curve segment, the initial reactive power consumption within this time period can be calibrated to obtain the corresponding calibrated reactive power consumption, and then the AVC is controlled to cancel the reactive power of the target power grid.

[0150] In the embodiment of the present application, the initial reactive power consumption can be calibrated according to the floating ratio, so as to improve the accuracy of the subsequent obtained calibrated reactive power consumption, and then improve the accuracy of the adjustment of the AVC device.

[0151] Figure 7 Shows the specific implementation flowcharts of S205 and S206 of a fault detection method for an AVC system based on a spatio-temporal model provided in the fifth embodiment of the present application. Refer to Figure 7 , relative to Figure 2-6 Any of the above-described embodiments, the fault detection method for an AVC system based on a spatio-temporal model provided in this embodiment includes: S2051 in S205, and S206 includes S2061 to S2062, which are specifically described in detail as follows:

[0152] Further, the generating a fault prompt message when the time-domain reactive power change curve meets the preset reactive power circulating current condition includes:

[0153] In S2051, according to the bus identifier of the high-voltage bus in the fault prompt information, determine the standby AVC device corresponding to the bus identifier.

[0154] In this embodiment, multiple AVC devices can be configured in the target power grid, and different AVC devices can adjust the reactive power consumption in the loop where they are located. When the electronic device detects the loop circulation of reactive power consumption in the target power grid, it can determine the high-voltage bus where the primary loop circulation is located, and then determine the AVC device used to adjust the high-voltage bus as the faulty AVC device. Therefore, it can be judged whether there is a standby AVC device for the faulty AVC device and the working state corresponding to the standby AVC device.

[0155] Performing reactive power compensation adjustment on the target power grid according to the fault handling process corresponding to the reactive power circulation condition includes:

[0156] In S2061, if the standby AVC device is in an idle state, replace the in-use AVC device in the target voltage with the standby AVC device, so as to perform the fault handling process corresponding to the reactive power circulation condition through the standby AVC device and perform reactive power compensation adjustment on the target power grid.

[0157] In this embodiment, if the standby AVC device for reactive power consumption compensation of the high-voltage bus in the target power grid is in an idle state, it can replace the currently in-use AVC device, and perform reactive power consumption compensation on the target power grid through the standby AVC device. Among them, the reactive power consumption compensation can be calibrated based on the floating ratio corresponding to the Qth curve segment and the current initial reactive power consumption to obtain the calibrated reactive power consumption, and perform reactive power consumption compensation based on the calibrated reactive power consumption.

[0158] In S2062, if the standby AVC device is in an occupied state, send device replacement information to the management user associated with the target power grid.

[0159] In this embodiment, if there is no idle standby AVC device in the target power grid, the management user can be notified that the in-use AVC device has been replaced by the management user.

[0160] In this embodiment, Figure 8 shows a structural block diagram of a fault detection device for an AVC system based on a spatio-temporal model provided by an embodiment of the present application. Each unit included in the fault detection device for the AVC system based on the spatio-temporal model is used to execute Figure 2 the respective steps implemented by the first device in the corresponding embodiment. For details, please refer to Figure 2 and Figure 2The relevant descriptions in the corresponding embodiments. For the sake of convenience, only the parts related to this embodiment are shown.

[0161] See Figure 8 , a fault detection device for an AVC system based on a spatio-temporal model, including:

[0162] A bus voltage acquisition unit 81, configured to receive the bus voltage of the high-voltage bus in the target power grid fed back by a plurality of acquisition devices based on a preset acquisition period;

[0163] An initial reactive power consumption determination unit 82, configured to determine the initial reactive power consumption corresponding to the target power grid according to the power grid impedance corresponding to the moment of acquiring the bus voltage and all the bus voltages; the power grid impedance is determined based on the spatial model corresponding to the target power grid;

[0164] A curve generation unit 83, configured to construct a time-domain reactive power change curve of the target power grid through the bus voltage and the initial reactive power consumption corresponding to each acquisition period;

[0165] A fault prompt information generation unit 84, configured to generate fault prompt information if the time-domain reactive power change curve meets a preset reactive power circulation condition;

[0166] A reactive power compensation unit 85, configured to perform reactive power compensation adjustment on the target power grid according to the fault handling process corresponding to the reactive power circulation condition.

[0167] It should be understood that Figure 8 In the structural block diagram of the shown device, each module is used to execute Figures 2 to 7 the respective steps in the corresponding embodiments, and for Figures 2 to 7 the respective steps in the corresponding embodiments have been explained in detail in the above embodiments. For details, please refer to Figures 2 to 7 and Figures 2 to 7 the relevant descriptions in the corresponding embodiments, which will not be elaborated here.

[0168] Figure 9 It is a structural block diagram of an electronic device provided in another embodiment of the present application. As Figure 9 described, the electronic device 900 in this embodiment includes: a processor 910, a memory 920, and a computer program 930 stored in the memory 920 and executable on the processor 910, such as a program for a fault detection method for an AVC system based on a spatio-temporal model. When the processor 910 executes the computer program 930, it implements the steps in each of the above-mentioned fault detection methods for an AVC system based on a spatio-temporal model, such as Figure 2 the S201 to S205 described. Or, when the processor 910 executes the computer program 930, it implements the above-mentioned Figure 8The functions of the various modules in the corresponding embodiments, for example, Figure 8 the functions of the units 81 to 85 described above, for specific details, please refer to Figure 8 the relevant descriptions in the corresponding embodiments.

[0169] Exemplarily, the computer program 930 may be divided into one or more modules. One or more modules are stored in the memory 920 and executed by the processor 910 to complete the present application. One or more modules may be a series of computer program instruction segments capable of performing specific functions, and these instruction segments are used to describe the execution process of the computer program 930 in the electronic device 900. For example, the computer program 930 may be divided into various unit modules, and the specific functions of each module are as described above.

[0170] The electronic device 900 may include, but is not limited to, a processor 910 and a memory 920. Those skilled in the art can understand that Figure 9 merely examples of the electronic device 900, which do not constitute a limitation on the electronic device 900. It may include more or fewer components than shown in the figure, or combine certain components, or different components. For example, the electronic device may also include input / output devices, network access devices, buses, etc.

[0171] The so-called processor 910 may be a central processing unit, or may also be other general-purpose processors, digital signal processors, application-specific integrated circuits, off-the-shelf programmable gate arrays, or other programmable logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc.

[0172] The memory 920 may be an internal storage unit of the electronic device 900, such as the hard disk or memory of the electronic device 900. The memory 920 may also be an external storage device of the electronic device 900, such as a plug-in hard disk, a smart memory card, a flash memory card, etc. equipped on the electronic device 900. Further, the memory 920 may also include both the internal storage unit and the external storage device of the electronic device 900.

[0173] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A fault detection method for an AVC system based on a spatiotemporal model, characterized in that: include: Receiving bus voltages of high-voltage buses in a target power grid fed back by a plurality of acquisition devices based on a preset acquisition cycle; Determine the initial reactive power consumption corresponding to the target power grid according to the power grid impedance corresponding to the moment of collecting the bus voltage and all the bus voltages; the power grid impedance is determined based on the space model corresponding to the target power grid; Constructing a time-domain reactive power variation curve of the target power grid by using the bus voltage and the initial reactive power consumption corresponding to each acquisition cycle; If the time-domain reactive power variation curve meets the preset reactive power circulation condition, a fault prompt information is generated; According to the fault handling process corresponding to the reactive circulating current condition, reactive compensation adjustment is performed on the target power grid; Before determining the initial reactive power consumption corresponding to the target power grid according to the power grid impedance corresponding to the time of collecting the bus voltage and all the bus voltages, the method further includes: Acquire scene information corresponding to the target power grid; the scene information includes: weather information and unit operation parameters; The spatial floating coefficient is determined according to the wind strength and rainfall in the weather information; the spatial floating coefficient is specifically: Wherein, SpaceLv is the spatial floating coefficient; CableMax is the maximum value of the cable length in the target power grid; WindLv is the wind strength; UnitL is the reference unit length corresponding to the cable; RainFall is the rainfall; Time is the rainfall duration; RSpeed ​​is the drainage speed; Performing model calibration on the initial model of the target power grid by using the spatial floating coefficient to obtain a spatial calibration model; Based on the power parameters of each in-use device recorded in the unit operation parameter record, respectively adjusting the object state of the first virtual object corresponding to each in-use device in the space calibration model; using the space calibration model after adjusting the object state of the virtual object as the space model; The determining, according to the grid impedance corresponding to the moment of collecting the bus voltage and all the bus voltages, the initial reactive power consumption corresponding to the target grid comprises: According to each of the bus voltages, adjusting the object state of the second virtual object of each of the high-voltage buses in the space model; Determine a voltage floating factor corresponding to the space model based on the object states of all the second virtual objects and the input voltage of the target power grid corresponding to the moment of collecting the bus voltage; Perform parameter calibration on the bus voltage and the power parameters of each of the in-use devices by using the voltage floating factor to obtain a calibration voltage corresponding to the bus voltage and a calibration parameter corresponding to the power parameter; According to the calibration voltages corresponding to all high-voltage buses and the calibration parameters, a grid impedance equation and a reactive power consumption equation corresponding to the target grid are constructed; the grid impedance equation is: Among them, X IMP is the grid impedance; U n The calibration voltage corresponding to the high-voltage bus obtained by the nth acquisition device; U m is the calibration parameter of the mth device in use set on the high-voltage bus; U Tagt is the target voltage corresponding to the high voltage bus; Q j is the initial reactive power consumption corresponding to the high voltage bus; Q Tagt is the reactive power offsetting power consumption corresponding to the high-voltage bus at the moment of collecting the bus voltage; α is a preset weighting coefficient; N is the total number of the collecting devices; M is the total number of the devices in use; The reactive power consumption equation is: The reactive power consumption equation and the grid impedance equation are combined to calculate the initial reactive power consumption.

2. The fault detection method according to claim 1, characterized in that: Before generating fault prompt information if the time-domain reactive power change curve meets the preset reactive circulating current condition, and performing reactive power compensation adjustment on the target power grid according to the fault handling process corresponding to the reactive circulating current condition, the method further includes: Based on a preset circulating current iteration time, the time domain reactive power variation curve is divided into a plurality of curve segments; the curve length corresponding to each curve segment is the circulating current iteration time; According to the extreme values ​​of each initial reactive power consumption recorded in the curve segment, respectively determining the floating ratio corresponding to each curve segment; The circulation confidence is calculated according to the floating ratio corresponding to each of the curve segments; the circulation confidence is: Wherein, Trust is the confidence of the circulation; Float q is the floating ratio corresponding to the qth curve segment; Q is the total number of all curve segments in the time domain reactive power change curve; Time q is the acquisition time corresponding to the qth curve segment; Time Q To collect the bus voltage moment; If the circulating current confidence is greater than a preset confidence threshold, it is identified that the time-domain reactive power variation curve satisfies a preset reactive circulating current condition.

3. The fault detection method according to claim 2, characterized in that: After calculating the circulation confidence according to the floating ratios corresponding to the curve segments, the method further includes: If the circulating current confidence is less than or equal to the confidence threshold, identifying that the time-domain reactive power variation curve does not satisfy the reactive circulating current condition; According to the floating ratio corresponding to the Qth curve segment, the initial reactive power consumption is calibrated to obtain a calibrated reactive power consumption; Based on the calibrated reactive power consumption, the AVC device is controlled to offset the reactive power consumption of the target power grid.

4. The fault detection method according to any one of claims 1 to 3, characterized in that: If the time-domain reactive power change curve meets the preset reactive circulating current condition, fault prompt information is generated, including: Determine, according to the bus identifier of the high-voltage bus in the fault prompt information, a standby AVC device corresponding to the bus identifier; The reactive power compensation adjustment is performed on the target power grid according to the fault handling process corresponding to the reactive circulating current condition, including: If the standby AVC device is in an idle state, the AVC device in use in the target voltage is replaced by the standby AVC device, so that the fault handling process corresponding to the reactive circulating current condition is executed through the standby AVC device to perform reactive compensation adjustment on the target power grid.

5. The fault detection method according to claim 4, characterized in that: The reactive power compensation adjustment is performed on the target power grid according to the fault handling process corresponding to the reactive circulating current condition, including: If the standby AVC device is in an occupied state, device replacement information is sent to a management user associated with the target power grid.

6. A fault detection device for an AVC system based on a spatiotemporal model, characterized in that: include: A bus voltage acquisition unit, used for receiving the bus voltage of the high-voltage bus in the target power grid fed back by a plurality of acquisition devices based on a preset acquisition cycle; An initial reactive power consumption determination unit, configured to determine the initial reactive power consumption corresponding to the target power grid according to the power grid impedance corresponding to the moment of collecting the bus voltage and all the bus voltages; the power grid impedance is determined based on a spatial model corresponding to the target power grid; A curve generating unit, configured to construct a time-domain reactive power variation curve of the target power grid by using the bus voltage and the initial reactive power consumption corresponding to each acquisition period; A fault prompt information generating unit, configured to generate fault prompt information if the time-domain reactive power variation curve meets a preset reactive circulating current condition; A reactive power compensation unit, configured to perform reactive power compensation adjustment on the target power grid according to a fault handling process corresponding to the reactive circulating current condition; The initial reactive power consumption determination unit is further used for: Acquire scene information corresponding to the target power grid; The scene information includes: weather information and unit operating parameters; The spatial floating coefficient is determined according to the wind strength and rainfall in the weather information; the spatial floating coefficient is specifically: Wherein, SpaceLv is the spatial floating coefficient; CableMax is the maximum value of the cable length in the target power grid; WindLv is the wind strength; UnitL is the reference unit length corresponding to the cable; RainFall is the rainfall; Time is the rainfall duration; RSpeed ​​is the drainage speed; Performing model calibration on the initial model of the target power grid by using the spatial floating coefficient to obtain a spatial calibration model; Based on the power parameters of each in-use device recorded in the unit operation parameter record, respectively adjusting the object state of the first virtual object corresponding to each in-use device in the space calibration model; using the space calibration model after adjusting the object state of the virtual object as the space model; The determining, according to the grid impedance corresponding to the moment of collecting the bus voltage and all the bus voltages, the initial reactive power consumption corresponding to the target grid comprises: According to each of the bus voltages, adjusting the object state of the second virtual object of each of the high-voltage buses in the space model; Determine a voltage floating factor corresponding to the space model based on the object states of all the second virtual objects and the input voltage of the target power grid corresponding to the moment of collecting the bus voltage; Perform parameter calibration on the bus voltage and the power parameters of each of the in-use devices by using the voltage floating factor to obtain a calibration voltage corresponding to the bus voltage and a calibration parameter corresponding to the power parameter; According to the calibration voltages corresponding to all high-voltage buses and the calibration parameters, a grid impedance equation and a reactive power consumption equation corresponding to the target grid are constructed; the grid impedance equation is: Among them, X IMP is the grid impedance; U n The calibration voltage corresponding to the high-voltage bus obtained by the nth acquisition device; U m is the calibration parameter of the mth device in use set on the high-voltage bus; U Tagt is the target voltage corresponding to the high voltage bus; Q j is the initial reactive power consumption corresponding to the high voltage bus; Q Tagt is the reactive power offsetting power consumption corresponding to the high-voltage bus at the moment of collecting the bus voltage; α is a preset weighting coefficient; N is the total number of the collecting devices; M is the total number of the devices in use; The reactive power consumption equation is: The reactive power consumption equation and the grid impedance equation are combined to calculate the initial reactive power consumption.

7. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method according to any one of claims 1 to 5 is implemented.

8. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 5 is implemented.

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