Electric leakage risk detection method and detection system for automobile charging pile

Abstract

The invention relates to the technical field of charging pile monitoring, in particular to an electric leakage risk detection method and detection system for an automobile charging pile, and the method comprises the steps: obtaining the current data of the charging pile at a target moment and in a preset neighborhood range; determining the current unbalance amount of the charging pile at each moment by using the current data; determining a target electric leakage risk degree of the target charging pile and a reference electric leakage risk degree of a reference charging pile in the same charging network as the target charging pile by using the current unbalance amount; the target electric leakage risk degree and the reference electric leakage risk degree are utilized to determine the multi-pile cascade electric leakage risk degree of the target charging pile at the target moment; and outputting corresponding early warning information or a protection mechanism by using the multi-pile cascade electric leakage risk degree. Through linkage current characteristics of multiple charging piles, weak electric leakage signals are amplified, the electric leakage risk assessment accuracy is improved, it is ensured that abnormal fluctuation of the current signals can be accurately captured at the initial stage of electric leakage, and therefore a safety protection and alarm mechanism is triggered in time.

Description

Technical Field

[0001] The present invention relates to the technical field of charging pile monitoring, and in particular to a leakage risk detection method and a detection system for an automobile charging pile. Background Art

[0002] As an important infrastructure for charging electric vehicles, the construction speed and application scope of charging piles are constantly expanding. In the application of high-power AC-DC conversion and high-frequency switching technology, charging piles are prone to leakage due to insulation aging, poor contact or installation defects, which will not only cause safety accidents such as electric shock and fire, but also cause equipment damage and grid cascade failure, seriously affecting charging safety and system stability. At present, the current signals of each phase line in the charging pile circuit are generally monitored and analyzed and processed, and the presence of leakage risk is determined according to the preset threshold. When the leakage risk is detected, an alarm signal is triggered and the power supply of the charging pile can be cut off to prevent the further expansion of the leakage accident.

[0003] However, the initial leakage signal of the charging pile is usually very weak and can be easily overwhelmed by electromagnetic interference, which may result in the early weak abnormal signal being missed, thereby increasing safety risks. Summary of the invention

[0004] In order to solve the technical problem that the initial leakage signal of the charging pile is relatively weak and easily causes safety risks due to missed detection of abnormal signals, the purpose of the present invention is to provide a leakage risk detection method and detection system for a vehicle charging pile. The technical scheme adopted is as follows: The present invention provides a method for detecting leakage risk of a vehicle charging pile, the method comprising: Obtain current data of the charging pile at the target time and within its preset neighborhood; Use current data to determine the current imbalance of the charging pile at each moment; Determine the target leakage risk of the target charging pile and the reference leakage risk of the reference charging pile in the same charging network as the target charging pile by using the current unbalance amount; The target leakage risk and the reference leakage risk are used to determine the multi-pile cascade leakage risk of the target charging pile at the target time. Utilize the multi-pile cascade leakage risk to output corresponding warning information or protection mechanism.

[0005] Furthermore, the step of obtaining the current data of the charging pile at the target time and within a preset neighborhood thereof includes: Obtain the input current and output current of the charging pile at the target time and within its preset neighborhood; Among them, the input current represents the current entering the charging pile from the power grid or power supply, and the output current represents the current transmitted from the charging pile to the electric vehicle.

[0006] Furthermore, the method of using the current data to determine the current imbalance of the charging pile at each moment includes: The absolute difference between the input current and the output current of the charging pile at each moment is taken as the current imbalance.

[0007] Furthermore, the method of determining the target leakage risk of the target charging pile by using the current unbalance amount includes: The current unbalance amount is used to determine the cumulative trend of the current unbalance amount of the charging pile at the target time; The target leakage risk of the target charging pile is determined by using the cumulative trend of the current imbalance and the fluctuation degree of the high-frequency component of the current within a preset neighborhood.

[0008] Further, the method of using the current unbalance amount to determine the current unbalance amount accumulation trend of the charging pile at the target time includes: Using the neighborhood current unbalance amount at each moment within the preset neighborhood range at the target moment, determine the average value of the current unbalance amount change trend within the preset neighborhood range; The cumulative trend of the current imbalance of the charging pile at the target time is calculated by using the average value of the current imbalance change trend and the target current imbalance at the target time.

[0009] Furthermore, the method of using the target leakage risk and the reference leakage risk to determine the multi-pile cascade leakage risk of the target charging pile at the target time includes: Using the reference leakage risk, determine the leakage cascade transferability of the reference charging pile at the target time; Using the leakage cascade transmission property, determine the leakage linkage characteristics of the target charging pile at the target time; The target leakage risk and leakage linkage characteristics are used to calculate the multi-pile cascade leakage risk of the target charging pile at the target time.

[0010] Furthermore, the use of the reference leakage risk to determine the leakage cascade transferability of the reference charging pile at the target time includes: Determine the average value of the leakage risk of the reference charging pile within the preset neighborhood at the target time; The reference current transient characteristics of the reference charging pile at the target time are calculated using the reference leakage risk degree and the leakage risk mean value; The leakage cascade transferability of the reference charging pile at the target time is determined by using the reference current transient characteristics of the reference charging pile at the target time.

[0011] Further, the use of the reference current transient characteristics of the reference charging pile at the target time to determine the leakage cascade transferability of the reference charging pile at the target time includes: Determine each intermediate charging pile between the target charging pile and the reference charging pile and each remote charging pile where the reference charging pile is far from the target charging pile; Determine the intermediate current transient characteristics and the remote current transient characteristics of the intermediate charging pile and the remote charging pile at the target time respectively; The leakage cascade transferability of the reference charging pile at the target time is calculated by using the reference current transient characteristics, the intermediate current transient characteristics and the remote current transient characteristics.

[0012] Furthermore, the method of utilizing the leakage cascade transfer property to determine the leakage linkage characteristics of the target charging pile at the target time includes: Using the leakage cascade transferability and the transient characteristics of the reference current, the current common-mode interference of the reference charging pile at the target time is calculated; The leakage linkage characteristics of the target charging pile at the target time are calculated by using the current common mode interference and the distance between the target charging pile and the reference charging pile.

[0013] The present invention also provides a leakage risk detection system for a vehicle charging pile, the system being used to implement the leakage risk detection method for a vehicle charging pile as described in any one of the above items; the system comprising: A current detection module is used to obtain the current data of the charging pile at the target time and within its preset neighborhood; The risk assessment module is used to determine the current imbalance of the charging pile at each time using the current data; determine the target leakage risk of the target charging pile and the reference leakage risk of the reference charging pile in the same charging network as the target charging pile using the current imbalance; determine the multi-pile cascade leakage risk of the target charging pile at the target time using the target leakage risk and the reference leakage risk; The leakage protection module is used to utilize the multi-pile cascade leakage risk to output corresponding warning information or protection mechanism.

[0014] The present invention has the following beneficial effects: In the process of judging the leakage risk by monitoring the current signal of the charging pile, since the leakage is weak in the early stage, the general sampling frequency may not be able to capture the current anomaly, and the leakage risk of the charging pile may quickly evolve into a serious safety hazard. Therefore, the present invention judges the possibility of leakage risk by analyzing the initial leakage state of the automobile charging pile and the cascade current performance of the adjacent charging piles. When the detection system recognizes that the charging pile may have weak leakage, the linkage current characteristics of multiple charging piles are used to analyze the linkage current data of multiple charging piles, amplify the weak leakage signal, and improve the accuracy of leakage risk assessment through multi-pile collaborative analysis, accurately capture the initial abnormal signal, and ensure that the abnormal fluctuation of the current signal can be accurately captured at the early stage of leakage, thereby timely triggering the safety protection and alarm mechanism to prevent the leakage risk from rapidly evolving into a serious safety hazard. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 A flowchart of a method for detecting leakage risk of a vehicle charging pile provided by an embodiment of the present invention; Figure 2 A detailed flow chart of step S3 in a method for detecting leakage risk of a vehicle charging pile provided by an embodiment of the present invention; Figure 3 A detailed flow chart of step S4 in a method for detecting leakage risk of a vehicle charging pile provided by one embodiment of the present invention; Figure 4 A detailed flow chart of step S41 in a method for detecting leakage risk of a vehicle charging pile provided by an embodiment of the present invention; Figure 5 It is a structural schematic diagram of the hardware operating environment of the leakage risk detection device of the automobile charging pile involved in the embodiment of the present invention; Figure 6 This is a schematic diagram of the framework structure of a leakage risk detection system for a vehicle charging pile according to an embodiment of the present invention; Figure 7 A schematic diagram of the cascade operation of multiple charging piles in the same charging network involved in an embodiment of the present invention; Figure 8 Schematic diagram of changes in the reference leakage risk of a reference charging pile involved in an embodiment of the present invention. DETAILED DESCRIPTION

[0017] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description of the leakage risk detection method of a car charging pile proposed by the present invention, its specific implementation method, structure, characteristics and effects, in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0018] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0019] The specific scheme of the leakage risk detection method of a vehicle charging pile provided by the present invention is described in detail below with reference to the accompanying drawings.

[0020] Embodiment 1: For the leakage risk detection method of a vehicle charging pile provided by the present invention, please refer to Figure 1 , which shows a flowchart of the steps of a method for detecting leakage risk of a car charging pile provided by an embodiment of the present invention.

[0021] The method comprises: Step S1, obtaining current data of the charging pile at the target time and within its preset neighborhood; Specifically, the step S1 includes: Obtain the input current and output current of the charging pile at the target time and within its preset neighborhood; Among them, the input current represents the current entering the charging pile from the power grid or power supply, and the output current represents the current transmitted from the charging pile to the electric vehicle.

[0022] In this embodiment, the charging pile refers to the car charging pile, please refer to Figure 7 , Figure 7 The following is a schematic diagram of the cascade operation of multiple charging piles in the same charging network involved in the embodiment of the present invention. As shown in the figure, the power supply end of a general car charging pile is connected to the power grid (or energy storage device), and the discharge end is connected to an electric car to charge the electric car. At the same time, there are generally multiple charging piles in the same charging network, which usually share the same ground or neutral line.

[0023] The current sensor can be used to collect the current data of the charging pile at various times and pre-process it. The target time can be any time, and the preset neighborhood range refers to a period of time before the target time, which can be determined and adjusted according to actual needs. For example, the current data within the preset neighborhood range can include 7 data points, namely 7 input currents and corresponding 7 output currents.

[0024] The current data collection and preprocessing can be specifically implemented as follows: High-precision current sensors (Hall sensors) are used to collect input current and output current. Clip-on Hall sensors are used at the positive and negative poles of the DC bus of the car charging pile. The analog output of each Hall sensor is connected to a multi-channel high-resolution ADC (Analog-to-Digital Converter) module through a signal conditioning circuit to ensure that each channel can collect data synchronously.

[0025] A digital low-pass filter can be further used to remove high-frequency noise, and a Kalman filter can be used to further smooth the data and extract the real current signal. Zero-point calibration is performed on the collected data to eliminate the zero drift and bias of the current sensor and ensure that the output is close to zero when there is no load. By synchronously sampling the data of each channel and using moving average processing, data continuity and stability are ensured, which is convenient for subsequent current balance analysis and leakage risk judgment.

[0026] Step S2, using the current data to determine the current imbalance of the charging pile at each moment; Specifically, the step S2 includes: The absolute difference between the input current and the output current of the charging pile at each moment is taken as the current imbalance.

[0027] The leakage risk of car charging piles will bring huge safety hazards, and real-time leakage detection is required. During the normal operation of DC car charging piles, the input current and output current should basically remain balanced during the conversion process. If insulation aging, poor contact or internal circuit failure occurs, part of the current may leak through abnormal paths (such as flowing to the device housing or ground wire), causing the output current to be lower than the input current. When the leakage current exceeds the preset safety threshold, the system will determine that there is a leakage risk. However, in the early stage of leakage, the difference between the input and output currents is weak and may not be captured for early warning. Once the leakage risk is not detected in time, it may expand rapidly and generate a larger leakage current, thereby causing serious safety hazards such as electric shock and fire, bringing unpredictable risks to equipment and personnel. Therefore, it is necessary to analyze the current data of the charging pile in real time and capture the suspected leakage state for subsequent analysis.

[0028] According to the charging pile current data, obtain the suspected leakage status: When a car charging pile has a leakage risk, part of the current leaks to the ground or the device casing through an unexpected path, resulting in a small but continuous difference between the input and output currents. This current imbalance phenomenon is a direct manifestation of the leakage risk. If the leakage risk is not detected and the power supply is not cut off in time, it may cause electric shock accidents or even electrical fires. Detecting and accurately quantifying tiny current differences in advance can provide early warning at the early stage of the fault.

[0029] When the charging pile is working normally, the input current (i.e. the current entering the charging pile from the power grid or power supply) and the output current (the current transmitted from the charging pile to the electric vehicle through the charging interface) should be equal to form a closed energy transmission loop. However, the risk of leakage will cause the current to pass through an unexpected path, resulting in a difference between the input current and the output current, which is manifested as a current imbalance state. According to the input current and output current of the charging pile, the current imbalance is obtained: Represents the current imbalance at the th moment (target moment) of the th charging pile (as the target charging pile); Represents the output current value at the th moment of the th charging pile; Represents the input current value at the th moment of the th charging pile; Represents the absolute difference between the input current and the output current at the th moment of the

[0030] th charging pile, representing the current imbalance. Step S3: Determine the target leakage risk degree of the target charging pile and the reference leakage risk degree of the reference charging pile in the same charging network as the target charging pile by using the current imbalance; Figure 2 Specifically, referring to : Step S3 includes: Step S31: Determine the cumulative trend of the current imbalance of the charging pile at the target moment by using the current imbalance; More specifically, Step S31 includes: Determine the average change trend of the current imbalance within the preset neighborhood range by using the neighborhood current imbalances at each moment within the preset neighborhood range of the target moment; Calculate the cumulative trend of the current imbalance of the charging pile at the target moment by using the average change trend of the current imbalance and the target current imbalance at the target moment.

[0031] During the operation of the charging pile, minute leakage signals will accumulate to form a gradually increasing energy loss, existing in a low-amplitude and continuously cumulative manner. The cumulative effect of the differential current generated by the leakage of the charging pile usually shows a continuously rising trend. Obtain the cumulative trend of the current imbalance of the charging pile based on the current imbalance obtained from short-term continuous monitoring: Represents the cumulative trend of the current imbalance at the th moment of the th charging pile; Represents the slope of the current imbalance at the th moment of the th charging pile, representing the current change trend of the current imbalance; Represents the number of neighborhood current data points (the preset neighborhood range can include the first 7 current data points of the target moment, which can be adjusted specifically); Represents the The first charging station The current neighborhood at the moment The current unbalance at each moment; Indicates The first charging station The current neighborhood at the moment The current unbalance at a given moment. Indicates The first charging station The average value of the current unbalance change trend within the current neighborhood at each moment represents the change of the overall current unbalance. The larger the value, the greater the leakage current accumulation and the greater the current unbalance accumulation trend. Indicates The first charging station The trend of current unbalance at each moment is consistent with that of the neighborhood; is an exponential function with a natural constant as its base.

[0032] Step S32, determining the target leakage risk of the target charging pile by using the current imbalance accumulation trend and the degree of fluctuation of the current high-frequency component within a preset neighborhood.

[0033] By continuously monitoring and analyzing tiny imbalances in the charging pile current data, the trend of leakage accumulation can be discovered in a timely manner; at the same time, leakage current often contains high-frequency components (such as ground leakage noise or harmonic interference). By extracting the high-frequency components in the current data, the leakage signal characteristics can be identified.

[0034] The frequency spectrum distribution of the current signal is calculated using Fourier transform (FFT) to obtain the signal amplitude in the high-frequency range (above 10kHz), which is the high-frequency component. Based on the cumulative trend of the charging pile current imbalance and the high-frequency component in the current data, the leakage risk of the charging pile is preliminarily obtained: Indicates The first charging station Target leakage risk level at each moment; Indicates The first charging station The cumulative trend of current unbalance at each moment; Indicates The first charging station The fluctuation degree of the high-frequency component of the current within the preset neighborhood at each moment (the fluctuation degree of the high-frequency component of the current), that is, the variance of the high-frequency component. The larger the value, the stronger the fluctuation of the high-frequency component, and the greater the leakage risk.

[0035] Step S4, using the target leakage risk and the reference leakage risk to determine the multi-pile cascade leakage risk of the target charging pile at the target time; For details, please refer to Figure 3 , the step S4 comprises: Step S41, using the reference leakage risk, determining the leakage cascade transferability of the reference charging pile at the target time; More specifically, please refer to Figure 4 , the step S41 comprises: Step S410, determining the average value of the leakage risk of the reference charging pile within a preset neighborhood at the target time; Step S411, using the reference leakage risk and the leakage risk mean, calculate the reference current transient characteristics of the reference charging pile at the target time; When the initial leakage signal of a charging pile is very weak, it is often difficult to trigger the protection mechanism by analyzing its current data alone, because its leakage current may be far below the set safety threshold. However, in a charging network, multiple charging piles usually share the same ground or neutral line. When a charging pile has a weak leakage, its leakage current will affect the adjacent charging piles through the grid coupling effect. The linkage effect will form a global current anomaly in the entire charging network. By comprehensively analyzing the linkage current data of the car charging piles in the same charging network, it is possible to quantify and amplify the tiny anomalies of a single device, so as to more accurately determine whether there is a leakage risk in the entire area.

[0036] Multiple charging piles are linked to analyze current data and assess leakage risks: In the same charging network, multiple charging piles share a common power supply line and grounding system. Therefore, when a charging pile leaks electricity, its leakage current may be coupled to other charging piles through the grounding wire or power supply line, causing transient changes in the current signals of adjacent charging piles, which manifests as a sudden increase in the risk of leakage, which is actually caused by the influence of the leaking charging pile.

[0037] Please refer to Figure 8 , Figure 8 This is a schematic diagram of the change of the reference leakage risk of the reference charging pile involved in the embodiment of the present invention, wherein the horizontal axis is time in seconds, and the vertical axis is the normalized value of the leakage risk. As shown in the figure, the change of the leakage risk of a certain charging pile (reference charging pile) other than the target charging pile in the same charging network reflects that during normal operation, a certain charging pile leaks, which interferes with the reference charging pile through the same charging network, resulting in an imbalance in its current and an increase in the leakage risk.

[0038] According to the leakage risk of the charging pile at the same time, the current transient characteristics of other charging piles (reference charging piles) in the same charging network are obtained: Indicates Charging piles in the same charging network The first charging pile (reference charging pile) Current transient characteristics at each moment; Indicates Charging piles in the same charging network The first charging station Reference leakage risk at each moment; Indicates Charging piles in the same charging network The first charging station The average value of the leakage risk degree in a preset neighborhood range at a certain moment (the preset neighborhood range here can be the 10 data points before the target moment, which can be adjusted). Indicates Charging piles in the same charging network The first charging station The difference between the leakage risk at the moment and the neighborhood range represents the leakage risk of the same charging network. The charging piles are The associated impact of the impact of the charging pile. The larger the formula is, the greater the impact is. When a charging pile has a leakage risk, The greater the instantaneous change in current imbalance caused by the leakage of the ground network on each charging pile, the greater the instantaneous change in current imbalance.

[0039] Step S412, using the reference current transient characteristics of the reference charging pile at the target time, determining the leakage cascade transferability of the reference charging pile at the target time.

[0040] The step S412 specifically includes: Determine each intermediate charging pile between the target charging pile and the reference charging pile and each remote charging pile where the reference charging pile is far from the target charging pile; Determine the intermediate current transient characteristics and the remote current transient characteristics of the intermediate charging pile and the remote charging pile at the target time respectively; The leakage cascade transferability of the reference charging pile at the target time is calculated by using the reference current transient characteristics, the intermediate current transient characteristics and the remote current transient characteristics.

[0041] You can continue to refer to Figure 7Since each charging pile usually shares the same ground or neutral line, when a leakage charging pile fails, its leakage current will be transmitted along the common connection to the adjacent charging pile. The physical distance between different charging piles determines the attenuation degree of the leakage signal at each node: the charging piles that are closer are more significantly affected, which is manifested as a higher current transient amplitude and longer duration, while the charging piles that are farther away will show a weaker transient current signal. By comparing the current transient characteristics of different charging piles according to the distance from the leakage charging pile, the cascade transmission effect of the leakage signal can be quantified.

[0042] like Figure 7 As shown in the figure, when the oth charging pile has a leakage risk, the impact on other charging piles gradually decreases according to the direction of the arrow, showing the transferability of the leakage impact.

[0043] According to the distance between other charging piles and the leakage charging pile in the same charging network, the leakage cascade transmission of other charging piles can be obtained by comparing the current transient characteristics: Indicates Charging piles in the same charging network The first charging station The leakage cascade transmission at each moment; Indicates the same charging network The charging pile is located towards The number of charging piles between the charging piles (here refers to the middle charging piles, which can be arranged in order according to the distance); Indicates Charging piles in the same charging network The first intermediate charging station Current transient characteristics at each moment; Indicates Charging piles in the same charging network The first charging station Reference current transient characteristics at each moment; Indicates the same charging network A charging station is far away from The number of charging piles (remote charging piles) Indicates Charging piles in the same charging network Remote charging station The current transient characteristics at a certain moment. Indicates the same charging network The charging pile is located towards The charging pile is between the first charging pile and the The difference in current transient characteristics of the charging piles represents the transferability of the leakage impact. The closer to the leakage charging pile, the greater the impact, and the greater the current transient characteristics; Indicates the same charging network A charging station is far away from The charging pile of the first charging pile is The current transient characteristics of the charging piles are different; is a linear normalization function.

[0044] Step S42, using the leakage cascade transmission property, determining the leakage linkage characteristics of the target charging pile at the target time; Specifically, the step S42 includes: Using the leakage cascade transferability and the transient characteristics of the reference current, the current common-mode interference of the reference charging pile at the target time is calculated; The leakage linkage characteristics of the target charging pile at the target time are calculated by using the current common mode interference and the distance between the target charging pile and the reference charging pile.

[0045] When a single charging pile leaks electricity, its weak abnormal signal may not be able to trigger the protection mechanism independently. However, due to the electrical coupling between the charging piles in the network, the leakage signal will accumulate in the common grounding system, thus forming a current transient feature on other charging piles. By monitoring and comparing the current data of multiple charging piles, it is possible to determine whether the current imbalance is global, presents a consistent upward trend or a sudden change, thereby providing a more accurate early warning basis for leakage risks.

[0046] Since multiple charging piles share a common ground or neutral line, when a charging pile has a leakage risk, its leakage signal will be transmitted to other charging piles through the grid coupling effect. When other reference charging piles have both current transient characteristics and leakage cascade transmission, the reference charging pile is subject to common mode interference from the leakage charging pile. Based on the current transient characteristics and leakage cascade transmission of the reference charging piles belonging to the same charging network, the current common mode interference of the reference charging pile subject to the leakage charging pile is obtained: Indicates Charging piles in the same charging network The first charging station The amount of current common mode interference received at each moment; Indicates Charging piles in the same charging network The first charging station Reference current transient characteristics at each moment; Indicates Charging piles in the same charging network The first charging station The leakage cascade transmission property at each moment.

[0047] The leakage of a single charging pile will not only manifest as a weak current imbalance in its own line, but may also transmit interference to adjacent devices through the shared ground or neutral line. Depending on the distance, the degree of common-mode interference received varies. When there is a risk of leakage, the surrounding charging piles are all subject to common-mode interference, and there is even a trend change in the degree of interference based on the distance. In this case, it can be preliminarily determined that there is a leakage linkage phenomenon. According to the degree of common-mode interference of the current of the leakage charging pile on multiple charging piles, the leakage linkage characteristics of the charging piles are obtained: Indicates The first charging station The leakage linkage characteristics at each moment; Indicates the number of charging piles in the same charging network; Indicates The charging pile is connected to the same charging network The distance between charging posts; Indicates Charging piles in the same charging network The first charging station The amount of common-mode interference received at a given moment. Indicates The charging pile is connected to the same charging network The distance between charging piles is used as the weight of the leakage cascade effect. The smaller the distance, the greater the impact of the leakage cascade effect. Indicates that according to The charging pile and The distance between the charging piles is calculated by weighted averaging the current common mode interference received by the reference charging piles in the same charging network. The closer the distance, the greater the interference received, and the greater the leakage linkage feature. is the sigmoid function; it should be noted that, in order to ensure that the calculation results are meaningful, when performing fractional operations in the embodiments of the present invention, when encountering a situation where the denominator is 0, it is necessary to add a parameter adjustment factor greater than 0 to the denominator to prevent the denominator from being 0. The value of the parameter adjustment factor is set by the implementer according to the actual situation, and this application does not impose any special restrictions.

[0048] Step S43, using the target leakage risk and leakage linkage characteristics, calculate the multi-pile cascade leakage risk of the target charging pile at the target time.

[0049] When a charging pile has a leakage risk, the current data of other charging piles will inevitably be affected because they are in the same charging network. When multiple charging piles show a leakage cascade response, the weak initial leakage signal of a single charging pile can be amplified to obtain a more accurate leakage risk assessment. According to the leakage linkage characteristics and leakage risk of the charging piles, the cascade leakage risk of multiple charging piles is obtained: Indicates The first charging station The risk level of multi-pile cascade leakage at a certain time; Indicates The first charging station The leakage linkage characteristics at each moment; Indicates The first charging station Target leakage risk at a certain moment.

[0050] Step S5: using the multi-pile cascade leakage risk, output corresponding warning information or protection mechanism.

[0051] After obtaining the multi-pile cascade leakage risk of the charging pile, the system can take corresponding early warning and protection measures according to the risk level. When the multi-pile cascade leakage risk of the charging pile is within the first risk range (such as 0-0.3), the system can prompt maintenance personnel to pay attention and regularly check the grounding condition; when the leakage risk is within the second risk range (such as 0.3-0.6), the system can issue a yellow warning and notify maintenance personnel to conduct detailed inspections of the charging pile circuit condition; if the leakage risk reaches the third risk range (such as more than 0.6), the system can immediately trigger the circuit breaker protection mechanism and cut off the power supply of the charging pile to prevent safety accidents. By dynamically adjusting the sampling frequency to extract the detailed characteristics of the current, leakage detection is made more accurate and reliable, and timely warnings can be achieved at the early stage of leakage risk, effectively ensuring the safety of the charging pile and the surrounding environment.

[0052] Embodiment 2: The embodiment of the present invention also provides a leakage risk detection device for a vehicle charging pile. The leakage risk detection device for a vehicle charging pile can be a data calculation and processing device such as a charging pile, a computer, a server, or a combination of multiple devices.

[0053] like Figure 5 As shown, Figure 5 It is a structural schematic diagram of the hardware operating environment of the leakage risk detection device of the automobile charging pile involved in the embodiment of the present invention.

[0054] like Figure 5As shown, the leakage risk detection device of the automobile charging pile may include: a processor 1001, such as a CPU, a network interface 1004, a user interface 1003, a memory 1005, and a communication bus 1002. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display (Display), an input unit such as a control panel, and the optional user interface 1003 may also include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a WIFI interface). The memory 1005 may be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. The memory 1005 may also be a storage device independent of the aforementioned processor 1001. The memory 1005 as a computer storage medium may include a leakage risk detection program.

[0055] Those skilled in the art will understand that Figure 5 The hardware structure shown in the figure does not constitute a limitation of the device, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0056] Continue to refer to Figure 5 , Figure 5 The memory 1005 as a computer-readable storage medium may include an operating system, a user interface module, a network communication module, and a leakage risk detection program.

[0057] exist Figure 5 In the embodiment, the network communication module is mainly used to connect to the server and can communicate data with the server; and the processor 1001 can call the leakage risk detection program stored in the memory 1005 and execute the steps in the above embodiments.

[0058] The hardware structure of the leakage risk detection device for the above-mentioned automobile charging pile is used to implement various embodiments of the leakage risk detection method for the automobile charging pile of the present invention.

[0059] In addition, the present invention also provides a leakage risk detection system for a vehicle charging pile, please refer to Figure 6 , the leakage risk detection system of the automobile charging pile includes: The current detection module A10 is used to obtain the current data of the charging pile at the target time and within its preset neighborhood; The risk assessment module A20 is used to determine the current imbalance of the charging pile at each time using the current data; determine the target leakage risk of the target charging pile and the reference leakage risk of the reference charging pile in the same charging network as the target charging pile using the current imbalance; determine the multi-pile cascade leakage risk of the target charging pile at the target time using the target leakage risk and the reference leakage risk; The leakage protection module A30 is used to utilize the multi-pile cascade leakage risk to output corresponding warning information or protection mechanism.

[0060] Furthermore, the current detection module A10 is also used for: Obtain the input current and output current of the charging pile at the target time and within its preset neighborhood; Among them, the input current represents the current entering the charging pile from the power grid or power supply, and the output current represents the current transmitted from the charging pile to the electric vehicle.

[0061] Furthermore, the risk assessment module A20 is also used to: The absolute difference between the input current and the output current of the charging pile at each moment is taken as the current imbalance.

[0062] Furthermore, the risk assessment module A20 is also used to: The current unbalance amount is used to determine the cumulative trend of the current unbalance amount of the charging pile at the target time; The target leakage risk of the target charging pile is determined by using the cumulative trend of the current imbalance and the fluctuation degree of the high-frequency component of the current within a preset neighborhood.

[0063] Furthermore, the risk assessment module A20 is also used to: Using the neighborhood current unbalance amount at each moment within the preset neighborhood range at the target moment, determine the average value of the current unbalance amount change trend within the preset neighborhood range; The cumulative trend of the current imbalance of the charging pile at the target time is calculated by using the average value of the current imbalance change trend and the target current imbalance at the target time.

[0064] Furthermore, the risk assessment module A20 is also used to: Using the reference leakage risk, determine the leakage cascade transferability of the reference charging pile at the target time; Using the leakage cascade transmission property, determine the leakage linkage characteristics of the target charging pile at the target time; The target leakage risk and leakage linkage characteristics are used to calculate the multi-pile cascade leakage risk of the target charging pile at the target time.

[0065] Furthermore, the risk assessment module A20 is also used to: Determine the average value of the leakage risk of the reference charging pile within the preset neighborhood at the target time; The reference current transient characteristics of the reference charging pile at the target time are calculated using the reference leakage risk degree and the leakage risk mean value; The leakage cascade transferability of the reference charging pile at the target time is determined by using the reference current transient characteristics of the reference charging pile at the target time.

[0066] Furthermore, the risk assessment module A20 is also used to: Determine each intermediate charging pile between the target charging pile and the reference charging pile and each remote charging pile where the reference charging pile is far from the target charging pile; Determine the intermediate current transient characteristics and the remote current transient characteristics of the intermediate charging pile and the remote charging pile at the target time respectively; The leakage cascade transferability of the reference charging pile at the target time is calculated by using the reference current transient characteristics, the intermediate current transient characteristics and the remote current transient characteristics.

[0067] Furthermore, the risk assessment module A20 is also used to: Using the leakage cascade transferability and the transient characteristics of the reference current, the current common-mode interference of the reference charging pile at the target time is calculated; The leakage linkage characteristics of the target charging pile at the target time are calculated by using the current common mode interference and the distance between the target charging pile and the reference charging pile.

[0068] The specific implementation of the leakage risk detection system for the automobile charging pile of the present invention is basically the same as the various embodiments of the leakage risk detection method for the automobile charging pile mentioned above, and will not be repeated here.

[0069] In addition, the present invention also provides a computer-readable storage medium. The computer-readable storage medium of the present invention stores a leakage risk detection program, wherein when the leakage risk detection program is executed by a processor, the steps of the leakage risk detection method for a vehicle charging pile as described above are implemented.

[0070] Among them, the method implemented when the leakage risk detection program is executed can refer to the various embodiments of the leakage risk detection method of the automobile charging pile of the present invention, and will not be repeated here.

[0071] It should be noted that the sequence of the above embodiments of the present invention is only for description and does not represent the advantages and disadvantages of the embodiments. The processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0072] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from the reference embodiment.

[0073] It will be understood by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0074] The above description is only a preferred embodiment of the present invention, and does not limit the protection scope of the present invention. All equivalent structural / method transformations made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in reference to related technical fields are included in the protection scope of the present invention.

Claims

1. A method for detecting leakage risk of a vehicle charging pile, characterized in that: The method comprises: Obtain current data of the charging pile at the target time and within its preset neighborhood; Use current data to determine the current imbalance of the charging pile at each moment; Determine the target leakage risk of the target charging pile and the reference leakage risk of the reference charging pile in the same charging network as the target charging pile by using the current unbalance amount; The target leakage risk and the reference leakage risk are used to determine the multi-pile cascade leakage risk of the target charging pile at the target time. Utilize the multi-pile cascade leakage risk to output corresponding warning information or protection mechanism.

2. The method for detecting leakage risk of a vehicle charging pile according to claim 1, characterized in that: The obtaining of current data of the charging pile at the target time and within a preset neighborhood thereof includes: Obtain the input current and output current of the charging pile at the target time and within its preset neighborhood; Among them, the input current represents the current entering the charging pile from the power grid or power supply, and the output current represents the current transmitted from the charging pile to the electric vehicle.

3. The method for detecting leakage risk of a vehicle charging pile according to claim 2, characterized in that: The method of using current data to determine the current imbalance of the charging pile at each moment includes: The absolute difference between the input current and the output current of the charging pile at each moment is taken as the current imbalance.

4. The method for detecting leakage risk of a vehicle charging pile according to claim 1, characterized in that: The method of determining the target leakage risk of the target charging pile by using the current imbalance comprises: The current unbalance amount is used to determine the cumulative trend of the current unbalance amount of the charging pile at the target time; The target leakage risk of the target charging pile is determined by using the cumulative trend of the current imbalance and the fluctuation degree of the high-frequency component of the current within a preset neighborhood.

5. The method for detecting leakage risk of a vehicle charging pile according to claim 4, characterized in that: The method of using the current unbalance amount to determine the current unbalance amount accumulation trend of the charging pile at the target time includes: Using the neighborhood current unbalance amount at each moment within the preset neighborhood range at the target moment, determine the average value of the current unbalance amount change trend within the preset neighborhood range; The cumulative trend of the current imbalance of the charging pile at the target time is calculated by using the average value of the current imbalance change trend and the target current imbalance at the target time.

6. The method for detecting leakage risk of a vehicle charging pile according to claim 1, characterized in that: The method of using the target leakage risk and the reference leakage risk to determine the multi-pile cascade leakage risk of the target charging pile at the target time includes: Using the reference leakage risk, determine the leakage cascade transferability of the reference charging pile at the target time; Using the leakage cascade transmission property, determine the leakage linkage characteristics of the target charging pile at the target time; The target leakage risk and leakage linkage characteristics are used to calculate the multi-pile cascade leakage risk of the target charging pile at the target time.

7. The method for detecting leakage risk of a vehicle charging pile according to claim 6, characterized in that: The method of using the reference leakage risk to determine the leakage cascade transferability of the reference charging pile at the target time includes: Determine the average value of the leakage risk of the reference charging pile within the preset neighborhood at the target time; The reference current transient characteristics of the reference charging pile at the target time are calculated using the reference leakage risk degree and the leakage risk mean value; The leakage cascade transferability of the reference charging pile at the target time is determined by using the reference current transient characteristics of the reference charging pile at the target time.

8. The method for detecting leakage risk of a vehicle charging pile according to claim 7, characterized in that: The method of using the reference current transient characteristics of the reference charging pile at the target time to determine the leakage cascade transferability of the reference charging pile at the target time includes: Determine each intermediate charging pile between the target charging pile and the reference charging pile and each remote charging pile where the reference charging pile is far from the target charging pile; Determine the intermediate current transient characteristics and the remote current transient characteristics of the intermediate charging pile and the remote charging pile at the target time respectively; The leakage cascade transferability of the reference charging pile at the target time is calculated by using the reference current transient characteristics, the intermediate current transient characteristics and the remote current transient characteristics.

9. The method for detecting leakage risk of a vehicle charging pile according to claim 7, characterized in that: The method of utilizing the leakage cascade transfer property to determine the leakage linkage characteristics of the target charging pile at the target time includes: Using the leakage cascade transferability and the transient characteristics of the reference current, the current common-mode interference of the reference charging pile at the target time is calculated; The leakage linkage characteristics of the target charging pile at the target time are calculated by using the current common mode interference and the distance between the target charging pile and the reference charging pile.

10. A leakage risk detection system for a car charging pile, characterized in that: The system is used to implement the leakage risk detection method of the automobile charging pile according to any one of claims 1 to 9; the system comprises: A current detection module is used to obtain the current data of the charging pile at the target time and within its preset neighborhood; The risk assessment module is used to determine the current imbalance of the charging pile at each time using the current data; determine the target leakage risk of the target charging pile and the reference leakage risk of the reference charging pile in the same charging network as the target charging pile using the current imbalance; determine the multi-pile cascade leakage risk of the target charging pile at the target time using the target leakage risk and the reference leakage risk; The leakage protection module is used to utilize the multi-pile cascade leakage risk to output corresponding warning information or protection mechanism.

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