Disclosure of Invention
The invention aims to provide a safety monitoring system for an automobile charging pile based on big data, which aims to solve the problems in the background art.
The invention can be realized by the following technical scheme that the automobile charging pile safety monitoring system based on big data comprises a monitoring module and an information processing module;
the monitoring module comprises a plurality of power monitoring units and a temperature monitoring unit;
each electric power monitoring unit is respectively matched with a group of automobile charging piles, monitors electric power information of the automobile charging piles, comprises current, voltage and power of the automobile charging piles, so as to obtain electric power data, and is beneficial to an information processing module to judge whether the corresponding automobile charging piles work or not;
The temperature monitoring units are arranged on the outer sides of the automobile charging piles, and the identification range of the temperature monitoring units covers the automobile charging piles and is used for acquiring temperature data of the surfaces of the automobile charging piles;
The information processing module is used for receiving the electric power data and the temperature data and is used as real-time monitoring data, and the information processing module analyzes the temperature data to obtain heat source parts of each automobile charging pile, and heating speed and diffusion speed of each heat source part;
the information processing module matches the heat source part with the corresponding automobile charging pile to judge whether the heating of the corresponding automobile charging pile is related to the distribution of electronic elements in the corresponding automobile charging pile;
Meanwhile, the information processing module analyzes the heating speed and the diffusion speed of each heat source part corresponding to the automobile charging pile based on big data, and judges the safety of the automobile charging pile by comparing the historical data and the real-time monitoring data of the same type charging pile.
The invention further technically improves that the safety judgment of the information processing module on the automobile charging pile comprises the following directions:
Judging the heating delay time, namely after the automobile charging pile works, the electric power monitoring unit monitors electric power data, and as the automobile charging pile works continuously, the electric power load increases to cause the inside of the automobile charging pile to generate heat, but as the heat is conducted to the surface for a certain time, the surface temperature change affecting the automobile charging pile has a certain time delay, and the thermal response and the heat dissipation performance of the automobile charging pile can be judged in an auxiliary manner by comparing the change time of the electric power data and the time delay of the temperature change;
Judging the positions of the heat sources, wherein the information processing module is used for positioning the positions of the heat sources by monitoring the temperature changes of different areas on the surfaces of the automobile charging piles, further comparing the positions of the heat sources with the distribution conditions of electronic elements in the charging piles, judging whether the positions of the heat sources are matched with the distribution positions of the electronic elements in the automobile charging piles or not, and further judging whether abnormal heat sources occur or not;
And judging the temperature diffusion, wherein the information processing module compares the heat diffusion speed and the temperature distribution of each heat source part with a preset standard to judge whether the charging pile has enough heat dissipation capacity so as to ensure safe operation or whether the abnormal heat source position has potential safety hazards.
The invention further technically improves that the judgment of the heating delay time by the information processing module comprises the following steps:
A1, acquiring power information of a corresponding automobile charging pile by a power monitoring unit, and analyzing power load change of the corresponding automobile charging pile;
meanwhile, the temperature monitoring unit acquires the surface temperature of the corresponding automobile charging pile so as to monitor the surface temperature change of the corresponding automobile charging pile;
The information processing module corrects the temperature change based on the environmental data of the corresponding area;
The formula adopted is: ;
Wherein, Corresponding to the surface temperature change of the automobile charging pile; c is the specific heat capacity of the automobile charging pile;
Is an environmental impact function comprising:
the temperature of the environment, the humidity of the environment, the air circulation coefficient and the environment;
a2, comparing the power load change with the surface temperature change of the automobile charging pile;
a3, calculating delay time between power load change and surface temperature change through cross correlation analysis;
The cross-correlation analysis formula is: ;
Wherein, The power load at time t; Is the time t + Dt represents the time derivative of the integral variable; for the integration range, it means integrating all times; Is a cross function value;
The delay time calculation formula is: ;
Is a cross correlation function;
representing a function that makes the cross-correlation of the search Maximum time delay;
A4, delay time of maximum correlation in cross correlation analysisAnd a preset delay time rangeMatching, and judging whether the delay time is within a preset delay time range;
if delay time Not in the delay time rangeAnd if so, the information processing module judges that the automobile charging pile has potential faults.
The invention further technically improves that the judging method of the information processing module to the heat source position comprises the following steps:
s1, presetting identification points based on distribution of electronic elements in an automobile charging pile;
S2, monitoring the surface temperature of the automobile charging pile through a temperature monitoring unit, and combining the position coordinates of the automobile charging pile on the surface of the automobile charging pile to obtain the coordinate temperature corresponding to the surface of the automobile charging pile;
s3, calculating the heating range and the heating speed of the surface of the automobile charging pile;
The heating range is obtained by calculating the increment of the surface temperature of the automobile charging pile relative to the ambient temperature;
the heating speed is obtained by calculating the change rate of the surface temperature with time;
S4, heating delay calculation is carried out;
S5, matching and judging the heat source positions, including:
1) In the temperature distribution data, a heating center is obtained by calculating the position with the maximum temperature change rate;
2) The center of the heat source position is matched with the identification point;
calculating the space distance between the heat source position center and the identification point;
When the space distance is not greater than a preset space distance threshold value and the heating delay is within a delay time range, judging that the heating is the heat generated by the normal operation of the automobile charging pile;
If the condition is not satisfied, it is determined that abnormal heat generation exists.
When a plurality of automobile charging piles work together, the temperature monitoring unit respectively transmits the temperature data of each automobile charging pile to the information processing module, so that the temperature data of each automobile charging pile is ensured to be monitored independently;
the information processing module monitors the temperature data of each automobile charging pile through time sequence analysis, and obtains the temperature data dispersion degree among different automobile charging piles so as to judge whether the temperature distribution of each automobile charging pile is uniform or not;
If the electric power data of a certain automobile charging pile is normal, but the dispersion is larger than a preset safety threshold, judging whether the environmental data affects the automobile charging pile, for example, the problem that sunlight irradiates the automobile charging pile is solved.
When the electric power data is normal, the information processing module matches the surface temperature with the heat source position by presetting a normal heat distribution model;
the normal heat distribution model is established based on the heat source position and the temperature distribution rule of the automobile charging pile in a normal working state;
If the surface temperature of a certain automobile charging pile is discontinuous, a local heat island or cold spot phenomenon occurs, and warning information corresponding to the automobile charging pile is generated so as to remind a worker to overhaul the automobile charging pile in time, so that the problem that the surface of the automobile charging pile is cracked or damaged is avoided.
Compared with the prior art, the invention has the following beneficial effects:
According to the invention, the electric current, voltage, power and surface temperature data of the charging pile are respectively acquired through the electric power monitoring unit and the temperature monitoring unit, so that comprehensive monitoring of the working state and the temperature distribution of the charging pile is realized, the accuracy and the comprehensiveness of monitoring are improved, and the relation between the heating of the internal electronic element and the surface temperature change is quantified through the time delay analysis of the electric power data and the temperature data, thereby being beneficial to judging whether the thermal response performance and the heat dissipation capacity of the charging pile are normal or not;
Meanwhile, the information processing module can analyze the position of the heat source through the temperature data and match with the identification points of the electronic elements in the charging pile, so that whether abnormal heating exists or not can be accurately judged. In addition, the heat dissipation performance of the charging pile is further analyzed by calculating the heating speed and the heat diffusion range, and the temperature change of the charging pile is corrected by introducing environmental data, so that misjudgment caused by the influence of external environment is effectively avoided.
Detailed Description
In order to further describe the technical means and effects adopted by the invention for achieving the preset aim, the following detailed description is given below of the specific implementation, structure, characteristics and effects according to the invention with reference to the attached drawings and the preferred embodiment.
Referring to fig. 1, the invention provides a safety monitoring system of an automobile charging pile based on big data, which comprises a monitoring module and an information processing module;
The monitoring module comprises a plurality of power monitoring units and a temperature monitoring unit;
each electric power monitoring unit is respectively matched with a group of automobile charging piles, monitors electric power information of the automobile charging piles, comprises current, voltage and power of the automobile charging piles, so as to obtain electric power data, and is beneficial to an information processing module to judge whether the corresponding automobile charging piles work or not;
The temperature monitoring units are arranged on the outer sides of the automobile charging piles, and the identification range of the temperature monitoring units covers the automobile charging piles and is used for acquiring temperature data of the surfaces of the automobile charging piles;
The information processing module is used for receiving the electric power data and the temperature data and is used as real-time monitoring data, and the information processing module analyzes the temperature data to obtain heat source parts of each automobile charging pile, and the heating speed and the diffusion speed of each heat source part;
the information processing module matches the heat source part with the corresponding automobile charging pile to judge whether the heating of the corresponding automobile charging pile is related to the distribution of electronic elements in the corresponding automobile charging pile;
meanwhile, the information processing module analyzes the heating speed and the diffusion speed of each heat source part corresponding to the automobile charging pile based on the big data, and judges the safety of the automobile charging pile by comparing the historical data and the real-time monitoring data of the charging pile of the same type;
the information processing module judges the safety of the automobile charging pile in the following directions:
Judging the heating delay time, namely after the automobile charging pile works, the electric power monitoring unit monitors electric power data, and as the automobile charging pile works continuously, the electric power load increases to cause the inside of the automobile charging pile to generate heat, but as the heat is conducted to the surface for a certain time, the surface temperature change affecting the automobile charging pile has a certain time delay, and the thermal response and the heat dissipation performance of the automobile charging pile can be judged in an auxiliary manner by comparing the change time of the electric power data and the time delay of the temperature change;
the judgment of the heating delay time by the information processing module comprises the following steps:
a1, acquiring power information of a corresponding automobile charging pile by a power monitoring unit, and analyzing power load change of the corresponding automobile charging pile;
at the same time, the temperature monitoring unit obtains the surface temperature of the corresponding automobile charging pile To monitor the surface temperature change of the corresponding automobile charging pile;
The information processing module corrects the temperature change based on the environmental data of the corresponding area;
In this embodiment, the environmental data is obtained through a public weather data service;
the heat dissipation effect may be better when the ambient temperature is lower, and the heat dissipation effect may be worse when the ambient temperature is higher;
The formula adopted by the method is as follows: ;
Wherein, For corresponding to the surface temperature change of the automobile charging pile, the temperature increment of the surface of the charging pile relative to the initial state is represented, and the temperature increment is usually caused by gradually conducting heat generated by an internal heating source to the surface;
The heat generated by the power load is determined by the heat generated by the power load in the running process of the automobile charging pile and is derived from the calculation of current, voltage and power;
c is the specific heat capacity of the automobile charging pile;
representing the influence of environmental data on the temperature change of the automobile charging pile as an environmental influence function, comprising:
ambient temperature, H, ambient humidity, K, air flow coefficient
In this embodiment of the present invention, in the present embodiment,By large data acquisition, including data acquisition, data processing, construction of functions using large data analysis tools;
A2, obtaining power load change by analyzing the power data, and comparing the power load change with the surface temperature change of the automobile charging pile;
A3, calculating the delay time between the power load change and the surface temperature change through cross correlation analysis ;
Wherein the cross-correlation analysis formula is:;
Wherein, The power load at time t;
Is the time t + Surface temperature at time t;
dt represents the time derivative element of the integral variable, representing a small increment over continuous time;
for the integration range, it means integrating all times;
Is a value of a cross function, which represents AndDegree of correlation between;
The delay time calculation formula is: ;
Is a cross correlation function;
Indicating that the time delay for maximizing the cross-correlation function is sought;
When the power load of the automobile charging pile is increased, the internal element starts to generate heat, but the change of the surface temperature is delayed from the change of the power load due to the fact that a certain time is needed for heat conduction and diffusion, and the time delay enabling rho to be maximum can be found by calculating a cross correlation function, so that the time difference between the change of the power load and the change of the temperature is quantized;
a4, dividing the delay time of the maximum correlation in the cross correlation analysis and a preset delay time range Matching, and judging whether the delay time is within a preset delay time range;
Wherein, Delay time for minimum allowable heating;
delay time for maximum allowable heating;
if delay time Not in the delay time rangeIf the vehicle charging pile has potential faults, the information processing module judges that the vehicle charging pile has potential faults;
Judging the positions of the heat sources, wherein the information processing module is used for positioning the positions of the heat sources by monitoring the temperature changes of different areas on the surfaces of the automobile charging piles, further comparing the positions of the heat sources with the distribution conditions of electronic elements in the charging piles, judging whether the positions of the heat sources are matched with the distribution positions of the electronic elements in the automobile charging piles or not, and further judging whether abnormal heat sources occur or not;
Judging the temperature diffusion, wherein the information processing module judges whether the charging pile has enough heat dissipation capacity or not by comparing the heat diffusion speed and the temperature distribution of each heat source part with preset standards so as to ensure safe operation or whether the abnormal heat source position has potential safety hazards or not;
The method for judging the position of the heat source by the information processing module comprises the following steps:
S1, presetting identification points based on distribution of electronic elements in automobile charging piles ;
S2, monitoring the surface temperature of the automobile charging pile through a temperature monitoring unit, and combining the position coordinates (x, y) of the automobile charging pile on the surface of the automobile charging pile to obtain the coordinate temperature corresponding to the surface of the automobile charging pileT represents time;
s3, calculating the heating range and the heating speed of the surface of the automobile charging pile;
The heating range is calculated by calculating the increment of the surface temperature of the automobile charging pile relative to the ambient temperature, and the formula is as follows:
;
Wherein, The surface temperature of the surface (x, y) of the charging pile of the automobile at the time t is obtained by monitoring the surface temperature by a temperature monitoring unit;
Is ambient temperature;
Coordinate temperature of the (x, y) position of the surface of the charging pile for the vehicle relative to the ambient temperature An increasing amount of (2);
Will be With a preset temperature increment thresholdComparing, and determining whether the heating phenomenon exists at the position of the surface coordinates (x, y) of the automobile charging pile;
When (when) Temperature increase thresholdWhen the automobile charging pile is used, the heating phenomenon exists at the position of the surface (x, y) of the automobile charging pile;
The heating speed is calculated by calculating the change rate of the surface temperature with time ;
The formula is:;
Wherein, The change rate of the temperature of the surface (x, y) of the charging pile for the automobile along with the time t is the heating speed;
the temperature of the surface (x, y) of the charging pile for the car at time t;
to determine the partial derivative of time t, the surface temperature is expressed Rate of change over time;
S4, heating delay calculation is carried out;
S5, matching and judging the heat source positions, including:
1) Positioning a heating center;
determining a position of the temperature distribution data where the temperature change rate is maximum ,Taking the rate of changeThe maximum position;
2) The center of the heat source position is matched with the identification point;
calculating the position center and the identification point of the heat source A spatial distance D therebetween;
;
When D is not greater than the preset spatial distance threshold, and the heating delay is within the delay time range Judging that the heating is the heat generated by the normal operation of the automobile charging pile;
if the condition is not satisfied, it is determined that abnormal heat generation exists, and the abnormal heat generation may be a fault of the automobile charging pile or an influence of an external heat source.
When the plurality of automobile charging piles work together, the temperature monitoring unit respectively transmits the temperature data of each automobile charging pile to the information processing module, so that the temperature data of each automobile charging pile is ensured to be monitored independently;
the information processing module monitors the temperature data of each automobile charging pile through time sequence analysis, and obtains the temperature data dispersion degree among different automobile charging piles so as to judge whether the temperature distribution of each automobile charging pile is uniform or not;
If the electric power data of a certain automobile charging pile is normal, but the dispersion is larger than a preset safety threshold, judging whether the environmental data affects the automobile charging pile, for example, the problem that sunlight irradiates the automobile charging pile is solved.
When the power data are normal, the information processing module matches the surface temperature with the position of the heat source through presetting a normal heat distribution model;
the normal heat distribution model is established based on the heat source position and the temperature distribution rule of the automobile charging pile in a normal working state;
If the surface temperature of a certain automobile charging pile is discontinuous, a local heat island or cold spot phenomenon occurs, and warning information corresponding to the automobile charging pile is generated so as to remind a worker to overhaul the automobile charging pile in time, so that the problem that the surface of the automobile charging pile is cracked or damaged is avoided.
The present invention is not limited in any way by the above-described preferred embodiments, but is not limited to the above-described preferred embodiments, and any person skilled in the art will appreciate that the present invention can be embodied in the form of a program for carrying out the method of the present invention, while the above disclosure is directed to various equivalent embodiments, which are capable of being modified or altered in some ways, any simple modification, equivalent variations and alterations made to the above embodiments according to the technical principles of the present invention will still fall within the scope of the technical aspects of the present invention.