CN114383751A - Auxiliary analysis system for power grid operation based on wireless passive temperature measurement - Google Patents

Abstract

The invention belongs to the technical field of power grid operation analysis, and is used for solving the problem that the conventional power grid operation detection analysis system cannot evaluate the overall operation state and the overall safety performance of a region of a power grid through the node temperature condition, in particular to a power grid operation auxiliary analysis system based on wireless passive temperature measurement, which comprises an auxiliary analysis platform, wherein the auxiliary analysis platform is in communication connection with a data processing module, a temperature analysis module, a maintenance recommendation module and a safety rating module; when the temperature is analyzed, problems possibly occurring in the temperature of the power grid node are checked one by one from multiple angles by adopting three-dimensional analysis, the accuracy of a node temperature monitoring result is improved, early warning can be carried out through an alarm signal at the first time when the node temperature is abnormal, and therefore the numerical accuracy of a subsequent safety rating result and the regional safety coefficient is ensured.

Description

Auxiliary analysis system for power grid operation based on wireless passive temperature measurement

technical field

The invention belongs to the technical field of power grid operation analysis, in particular to a power grid operation auxiliary analysis system based on wireless passive temperature measurement.

Background technique

Safety is the eternal theme of power grid operation. "Safety first, prevention first" is the policy that power companies have followed for a long time. Establishing an effective safety management and risk prevention system is the core content of safe production of power companies. Identification, evaluation and processing are an important issue faced by power companies; grid security risk refers to the uncertainty of grid operation security, that is, the combination of the possibility and consequences of factors, events or states that may affect the security of grid operation.

The existing power grid safety operation detection and analysis system can only monitor the temperature of a single node of the power grid, but cannot evaluate the overall operating state of the power grid and the overall safety performance of the region through the node temperature, so it is impossible to evaluate the power grid according to the overall safety performance of the region. Reasonable allocation of resources and manpower.

In view of the above technical problems, the present application proposes a solution.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a power grid operation auxiliary analysis system based on wireless passive temperature measurement, which is used to solve the problem that the existing power grid operation detection and analysis system cannot evaluate the overall operation state of the power grid and the overall safety performance of the region based on the node temperature;

The technical problem to be solved by the present invention is: how to provide a power grid operation analysis system that can evaluate the overall operation state of the power grid and the regional safety performance through the node temperature.

The object of the present invention can be realized through the following technical solutions:

A power grid operation auxiliary analysis system based on wireless passive temperature measurement, including an auxiliary analysis platform, the auxiliary analysis platform is communicatively connected with a data processing module, a temperature analysis module, a maintenance recommendation module and a safety rating module, and the temperature analysis module is connected with the safety rating. a module communication connection, the safety rating module is communicatively connected with a regional analysis module;

The data processing module is used for data collection and sends the collected data to the auxiliary analysis platform;

The temperature analysis module is used to analyze the temperature of the key nodes of the power grid through the data collected by the data processing module, and send the temperature coefficient and temperature difference coefficient of the power grid obtained by the analysis to the auxiliary analysis platform;

After receiving the standard analysis results, the safety rating module performs a rating analysis on the safety status of the power grid operation;

After receiving the safety rating result, the regional analysis module analyzes the safety performance of the regional power grid to obtain the safety factor of the regional power grid, and marks the area with the safety factor less than the safety factor threshold as the risk area.

Further, the temperature analysis process of the key nodes of the power grid includes the following steps:

Step S1: Obtain the key nodes of the power grid and mark them as node i, i=1, 2, ..., n, n is a positive integer, obtain the temperature value of node i in real time and mark the temperature value of node i as node temperature WDi, The node temperature WDi is compared with the temperature threshold WDmax one by one. If there is a node whose WDi is not less than WDmax, the corresponding node will be marked as a dangerous node, and the power grid operating state will be marked as dangerous, and the temperature analysis module will send an alarm signal to the auxiliary analysis platform; if If all WDi is less than WDmax, the grid operation state is marked as pending;

Step S2: Perform temperature rise detection on the power grid whose operating status is pending, mark the temperature value of node i two minutes ago as WDie, mark the difference between WDi and WDie as the node temperature difference WCi, and perform the node temperature difference WCi with the temperature difference threshold WCmax one by one. By comparison, if there is a node with WCi not less than WCmax, the corresponding node will be marked as a dangerous node, and the power grid operation state will be marked as dangerous, and the temperature analysis module will send an alarm signal to the auxiliary analysis platform; if all WCi is less than WCmax, go to the next step;

Step S3: analyze the node temperature difference of the power grid to obtain the node difference JCi of the power grid node i, and compare the node difference JCi with the node difference threshold JCmax one by one. If there is a node whose JCi is not less than JCmax, the corresponding node and its adjacent nodes The two nodes are marked as dangerous nodes, and the power grid operation state is marked as dangerous at the same time, and the temperature analysis module sends an alarm signal to the auxiliary analysis platform; if all JCi are less than JCmax, the power grid operation state is determined to be safe.

Further, the acquisition process of the pitch difference JCi in step S3 includes:

A Cartesian coordinate system is established with the distance value as the X axis and the temperature difference between adjacent nodes as the Y axis, and two line segments are drawn in the Cartesian coordinate system with the origin of the Cartesian coordinate system as an endpoint, and the coordinate value of the second endpoint of the first line segment is is (X1, Y1), the value of X1 is the distance value between node i and node i-1, and the value of Y1 is the temperature difference between node i and node i-1; The coordinates of the two endpoints are (X2, Y2), the value of X2 is the distance between node i and node i+1, and the value of Y2 is the temperature difference between node i and node i+1. The angle value of the angle between the two line segments is marked as the pitch difference JCi.

Further, the standard analysis result is sent to the auxiliary analysis platform in the form of Bdc, where B represents the number of the power grid, d represents the temperature coefficient of the corresponding power grid, and c represents the temperature difference coefficient of the corresponding power grid; The analysis results are sent to the safety rating module.

Further, the specific process of the security rating module for rating and analyzing the security state of the power grid operation includes:

Select several power grids as rated power grids, and obtain the rating coefficient PJx of the rated power grid by analyzing the temperature coefficient and temperature difference coefficient of the rated power grid, and compare the rating coefficient PJx with the rating coefficients PJmin and PJmax. make a judgment.

Further, the comparison process between the rating coefficient PJx and the rating coefficients PJmin and PJmax is:

If PJx < PJmin, the safety level of the power grid is determined to be level three;

If PJmin≤PJx≤PJmax, the safety level of the power grid is judged to be Level 2;

If PJ>PJmax, it is determined that the safety level of the power grid is one level.

Further, the process of obtaining the safety factor includes: dividing the area, marking the number of rated power grids with a safety level of three in the area as s3, marking the number of rated power grids with a safety level of two in the area as s2, and marking the area The number of rated power grids whose internal safety level is one level is marked as s1, and the regional safety factor is obtained by calculating and analyzing s3, s2 and s1.

Further, after receiving the alarm signal, the auxiliary analysis platform sends the alarm signal to the maintenance recommendation module. After the maintenance recommendation module receives the alarm signal, it selects the recommended personnel according to the geographical location of the maintenance personnel, the working years and the number of maintenance executions in half a year, and then selects the recommended personnel. The identity information of the recommender is sent to the auxiliary analysis platform.

Further, the identity information of the maintenance personnel includes: the maintenance personnel's name, age, mobile phone number, years of employment, and the number of maintenance executions in half a year.

The present invention has the following beneficial effects:

1. The temperature analysis module analyzes the temperature data of the node, analyzes the temperature value of a single node, the heating rate of a single node and the temperature difference between adjacent nodes, and generates an alarm signal for the situation that the node temperature does not meet the standard. Maintenance After the recommendation module receives the alarm signal, it selects the most suitable maintenance personnel based on the geographical location of the maintenance personnel and historical maintenance data for recommendation. When all nodes of the power grid meet the standards, the safety rating module is used to determine the security level of the power grid. The analysis module obtains the risk area by analyzing the number of power grids of each safety level. Compared with the normal area, the risk area has a higher risk of safety accidents. Therefore, the maintenance resources and manpower can be allocated rationally according to the safety factor of the area;

2. In the temperature analysis, three-degree analysis is used to check the possible problems of the grid node temperature one by one from multiple perspectives, which improves the accuracy of the node temperature monitoring results. The first time the node temperature is abnormal, the alarm signal can be used for early warning. At the same time, the multi-angle inspection method also ensures that the temperature of all nodes of the power grid for the safety rating analysis is in a normal state, thus ensuring the numerical accuracy of the subsequent safety rating results and the regional safety factor.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

Fig. 1 is the principle block diagram of the present invention;

Fig. 2 is the principle block diagram of Embodiment 1 of the present invention;

FIG. 3 is a principle block diagram of Embodiment 2 of the present invention.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in Figure 1, the auxiliary analysis system for power grid operation based on wireless passive temperature measurement includes an auxiliary analysis platform. The auxiliary analysis platform communicates with a data processing module, a temperature analysis module, a maintenance recommendation module and a safety rating module. The temperature analysis module is connected with The safety rating module is communicatively connected, the safety rating module is also communicatively connected with a regional analysis module, and the data processing module is used to collect temperature data on key nodes of the power grid.

The data processing module includes a collector, a collector antenna, a sensor and a sensor antenna. The collector transmits excitation signals, and the collector antenna transmits the signal sent by the collector to the sensor antenna. The sensor antenna receives the excitation signal transmitted by the collector through the antenna, and the sensor modulates The temperature signal is sent back to the collector through the sensor antenna. The collector interprets the temperature information, and uses the surface acoustic wave technology to wirelessly and passively collect the node temperature data. It should be noted that the surface acoustic wave is a kind of elasticity that propagates along the surface of the object. Waves, different boundary conditions and propagation medium conditions can excite different modes of surface acoustic waves.

Example 1

As shown in Figure 2, the temperature analysis module is used to analyze the temperature data collected by the data processing module. The specific analysis process is as follows:

Monitor the temperature of a single node in real time, obtain key nodes of the power grid and mark them as node i, i=1, 2, ..., n, n is a positive integer, obtain the temperature value of node i in real time and mark the temperature value of node i For the node temperature WDi, compare the node temperature WDi with the temperature threshold WDmax one by one. If there is a node whose WDi is not less than WDmax, it means that the temperature of the node is higher than the temperature threshold, and the corresponding node is marked as a dangerous node, and the power grid operating status If it is marked as dangerous, the temperature analysis module sends an alarm signal to the auxiliary analysis platform; if all WDi is less than WDmax, the grid operation status is marked as pending, and the temperature values of all nodes of the grid whose operation status is pending are less than the temperature threshold;

The temperature rise detection is performed on the power grid whose operation status is pending. The process of temperature rise detection includes:

Mark the temperature value of node i two minutes ago as WDie, mark the difference between WDi and WDie as the node temperature difference WCi, the value of WCi is the temperature rise value of node i within two minutes, and compare the node temperature difference WCi with the temperature difference threshold one by one WCmax is compared. If there is a node with WCi not less than WCmax, it means that the temperature rise rate of the node does not meet the standard, then the corresponding node is marked as a dangerous node, and the power grid operating state is marked as dangerous, and the temperature analysis module is sent to the auxiliary analysis platform. Send an alarm signal; if all WCi is less than WCmax, it means that the heating rate of all nodes of the undetermined power grid meets the standard, and the node temperature difference analysis is performed on the power grid;

The specific process of nodal temperature difference analysis includes:

A Cartesian coordinate system is established with the distance value as the X axis and the temperature difference between adjacent nodes as the Y axis, and two line segments are drawn in the Cartesian coordinate system with the origin of the Cartesian coordinate system as an endpoint, and the coordinate value of the second endpoint of the first line segment is is (X1, Y1), the value of X1 is the distance value between node i and node i-1, and the value of Y1 is the temperature difference between node i and node i-1; The coordinates of the two endpoints are (X2, Y2), the value of X2 is the distance between node i and node i+1, and the value of Y2 is the temperature difference between node i and node i+1. The angle value of the angle between the two line segments is marked as the nodal difference JCi. The value of the nodal difference JCi represents the temperature difference between the detection node and the previous node and the next node. The value of the nodal difference JCi reflects the detection node. Internode temperature difference, after the grid node has passed the temperature analysis and temperature rise analysis, the internode temperature difference is monitored, and the multi-angle detection ensures the accuracy of the node temperature detection results;

Compare the nodal difference JCi with the nodal difference threshold JCmax one by one. If there is a node whose JCi is not less than JCmax, it means that there is a node that does not meet the inter-node temperature difference standard, then mark the corresponding node and the two adjacent nodes as dangerous nodes. At the same time, the operating state of the power grid is marked as dangerous, and the temperature analysis module sends an alarm signal to the auxiliary analysis platform; if all JCi is less than JCmax, it is determined that the operating state of the power grid is safe, and the power grid whose operating state is safe passes multi-angle triple temperature detection. An alarm signal can be sent at the first time of abnormality to avoid more serious safety accidents and improve the safety of the power grid operation state.

需要说明的是，温度系数WDx是一个表示电网各节点温度与温度阈值偏离程度的数值，温度系数WDx的数值越大，则表示电网各节点温度与温度阈值的偏离程度越高，电网运行安全性能也就越高，温差系数DCx的计算公式为

需要说明的是，温差系数WCx是一个表示电网各节点的节点温差与温差阈值偏离程度的数值，温差系数WCx的数值越大，则表示电网各节点的节点温差与温差阈值的偏离程度越高，即电网各节点的温度上升速度越慢，电网运行安全性能也就越高，其中α1与α2均为比例系数，且α1＞1，α2＞1，将电网的标准分析结果以 Bdc的形式发送至辅助分析平台，其中B表示电网的编号，d表示对应电网的温度系数WDx，c表示对应电网的温差系数WCx；辅助分析平台接收到标准分析结果后将标准分析结果发送至安全评级模块，以Bdc的形式发送标准分析结果可以将运行状态的电网编号与温度系数、温差系数进行绑定发送，有利于数据存储与调取；The standard analysis is carried out on the power grid whose operation state is safe, and the temperature coefficient WDx and the temperature difference coefficient WCx are obtained by the node temperature WDi of node i and the node temperature difference WCi. The calculation formula of the temperature coefficient WDx is as follows:

It should be noted that the temperature coefficient WDx is a value that indicates the degree of deviation between the temperature of each node of the power grid and the temperature threshold. The higher the temperature, the formula for calculating the temperature difference coefficient DCx is

It should be noted that the temperature difference coefficient WCx is a value that represents the degree of deviation between the node temperature difference of each node of the power grid and the temperature difference threshold. That is to say, the slower the temperature rise of each node of the power grid, the higher the safety performance of the power grid operation, where α1 and α2 are proportional coefficients, and α1>1, α2>1, the standard analysis results of the power grid are sent in the form of Bdc to Auxiliary analysis platform, where B represents the number of the power grid, d represents the temperature coefficient WDx of the corresponding power grid, and c represents the temperature difference coefficient WCx of the corresponding power grid; after receiving the standard analysis results, the auxiliary analysis platform sends the standard analysis results to the safety rating module, with Bdc The standard analysis results can be sent in the form of the grid number of the running state, and the temperature coefficient and temperature difference coefficient can be bound and sent, which is beneficial to data storage and retrieval;

After receiving the standard analysis results, the safety rating module performs a rating analysis on the safety status of the power grid operation. The rating analysis process includes:

Select several power grids as rated power grids, and obtain the rating coefficient PJx of the rated power grid by the formula PJx=β1×WDx+β2×WCx. It should be noted that the rating coefficient is a value representing the safety performance of the rated power grid operating state, and the value of the rating coefficient The higher the value, the better the safety performance of the rated power grid, where β1 and β2 are proportional coefficients, and β1>β2>0; compare the rating coefficient PJx with the rating coefficients PJmin, PJmax:

If PJx < PJmin, the safety level of the power grid is determined to be level three;

If PJmin≤PJx≤PJmax, the safety level of the power grid is judged to be Level 2;

If PJ>PJmax, the safety level of the power grid is determined to be level one;

The safety rating module sends the safety rating result of the rated power grid to the auxiliary analysis platform and the regional analysis module in the form of BS, where B represents the number of the power grid, and S is the safety level of the power grid;

The regional analysis module analyzes the regional power grid safety performance after receiving the safety rating results. The power grid safety performance analysis process includes:

得到区域的安全系数AQx，需要说明的是，安全系数是一个表示区域内评级电网的整体安全性能的数值，安全系数的数值越高表示区域内评级电网的整体安全性能越好，其中γ为比例系数，且γ＞1；将安全系数AQx小于安全阈值AQmin的区域标记为风险区域。For regional division, the number of rated power grids with a safety level of three in the region is marked as s3, the number of rated power grids with a safety level of two in the region is marked as s2, and the number of rated power grids with a safety level of one level in the region is marked as s2. The quantity is marked s1, by the formula

The safety factor AQx of the region is obtained. It should be noted that the safety factor is a value representing the overall safety performance of the rated power grid in the region. The higher the value of the safety factor, the better the overall safety performance of the rated power grid in the region, where γ is the ratio coefficient, and γ>1; the area where the safety factor AQx is less than the safety threshold AQmin is marked as a risk area.

Example 2

As shown in Figure 3, after receiving the alarm signal, the auxiliary analysis platform sends the alarm signal to the maintenance recommendation module. After the maintenance recommendation module receives the alarm signal, it recommends maintenance personnel for dangerous nodes. The specific process of the maintenance personnel recommendation includes:

Obtain the location of the dangerous node and mark the location of the dangerous node as the maintenance location, draw a circle with the maintenance location as the center and r as the radius, mark the obtained circular area as the primary selection area, and obtain the geographic location of all maintenance personnel in the primary selection area Location, mark the straight-line distance between the geographic location of the maintenance personnel in the primary selection area and the maintenance location as ZL; obtain the identity information of the maintenance personnel in the primary selection area. The identity information of the maintenance personnel includes: the maintenance personnel's name, age, mobile phone Number, years of employment, and the number of maintenance executions in half a year; mark the maintenance personnel's years of employment and the number of maintenance executions in half a year as CN and ZC, respectively. The geographical location analyzes the suitability of the maintenance personnel for this node maintenance;

得到维护人员的推荐系数TJx，需要说明的是，推荐系数是一个维护人员与本次节点维护的匹配程度的数值，推荐系数越高，则表示对应的维护人员约适合执行本次的节点维护，其中，θ1、θ2以及θ3均为比例系数，且θ1＞θ2＞θ3，选取初选区域内推荐系数最大的三个维护人员作为初选人员，将初选人员中ZL数值最小的维护人员标记为推荐人员，将推荐人员的身份信息发送至辅助分析平台，使推荐人员可以在第一时间到达危险节点的位置，同时也提高了成功维护的可能性。by formula

The recommendation coefficient TJx of the maintenance personnel is obtained. It should be noted that the recommendation coefficient is the value of the degree of matching between a maintenance personnel and the current node maintenance. The higher the recommendation coefficient, the corresponding maintenance personnel are approximately suitable for this node maintenance. Among them, θ1, θ2 and θ3 are proportional coefficients, and θ1>θ2>θ3, select the three maintenance personnel with the largest recommendation coefficient in the primary selection area as the primary selection personnel, and mark the maintenance personnel with the smallest ZL value among the primary selection personnel as The recommender sends the recommender's identity information to the auxiliary analysis platform, so that the recommender can reach the position of the dangerous node at the first time, and also improves the possibility of successful maintenance.

The power grid operation auxiliary analysis system based on wireless passive temperature measurement, when working, first analyzes the temperature data of the node through the temperature analysis module, and analyzes the temperature value of a single node, the heating rate of a single node and the temperature difference between adjacent nodes one by one. Analysis, generates an alarm signal when the node temperature does not meet the standard, after the maintenance recommendation module receives the alarm signal, it selects the most suitable maintenance personnel based on the geographical location of the maintenance personnel and historical maintenance data for recommendation, and all nodes in the power grid meet the standard. The safety rating module is used to determine the safety level of the power grid under the circumstance of The regional safety factor rationalizes the allocation of maintenance resources and manpower.

The above content is only an example and description of the structure of the present invention, and those skilled in the art can make various modifications or supplements to the specific embodiments described or replace them in similar ways, as long as they do not deviate from the structure of the invention or Anything beyond the scope defined by the claims shall belong to the protection scope of the present invention.

The above formulas are obtained by collecting a large amount of data for software simulation and selecting a formula that is close to the real value. The coefficients in the formula are set by those skilled in the art according to the actual situation; such as: formula PJx=β1×WDx+β2×WCx; A person skilled in the art collects multiple groups of sample data and sets a corresponding rating coefficient for each group of sample data; substitute the set rating coefficient and the collected sample data into the formula, and any two formulas form a binary linear equation system, and the calculation The obtained coefficients are screened and averaged, and the values of β1 and β2 are 1.95 and 1.47, respectively;

The size of the coefficient is a specific value obtained by quantifying each parameter, which is convenient for subsequent comparison. The size of the coefficient depends on the amount of sample data and the corresponding rating coefficients initially set by those skilled in the art for each group of sample data. ; As long as the proportional relationship between the parameter and the quantized value is not affected, for example, the rating coefficient is proportional to the value of the temperature coefficient.

In the description of this specification, description with reference to the terms "one embodiment," "example," "specific example," etc. means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one aspect of the present invention. in one embodiment or example. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above-disclosed preferred embodiments of the present invention are provided only to help illustrate the present invention. The preferred embodiments do not describe all the details and do not limit the invention to specific embodiments only. Obviously, many modifications and variations are possible in light of the content of this specification. The present specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is to be limited only by the claims and their full scope and equivalents.

Claims (9)

1. An auxiliary analysis system for power grid operation based on wireless passive temperature measurement, comprising an auxiliary analysis platform, and it is characterized in that, the auxiliary analysis platform is communicatively connected with a data processing module, a temperature analysis module, a maintenance recommendation module and a safety rating module. The module is communicatively connected with the safety rating module, and the safety rating module is communicatively connected with a regional analysis module; The data processing module is used for data collection and sends the collected data to the auxiliary analysis platform; The temperature analysis module is used to analyze the temperature of the key nodes of the power grid through the data collected by the data processing module, and send the temperature coefficient and temperature difference coefficient of the power grid obtained by the analysis to the auxiliary analysis platform; After receiving the standard analysis results, the safety rating module performs a rating analysis on the safety status of the power grid operation; After receiving the safety rating result, the regional analysis module analyzes the safety performance of the regional power grid to obtain the safety factor of the regional power grid, and marks the area with the safety factor less than the safety factor threshold as the risk area. 2. The power grid operation auxiliary analysis system based on wireless passive temperature measurement according to claim 1, wherein the temperature analysis process of the key nodes of the power grid comprises the following steps: Step S1: Obtain the key nodes of the power grid and mark them as node i, i=1, 2, ..., n, n is a positive integer, obtain the temperature value of node i in real time and mark the temperature value of node i as node temperature WDi, The node temperature WDi is compared with the temperature threshold WDmax one by one. If there is a node whose WDi is not less than WDmax, the corresponding node will be marked as a dangerous node, and the power grid operating state will be marked as dangerous, and the temperature analysis module will send an alarm signal to the auxiliary analysis platform; if If all WDi is less than WDmax, the grid operation state is marked as pending; Step S2: Perform temperature rise detection on the power grid whose operating status is pending, mark the temperature value of node i two minutes ago as WDie, mark the difference between WDi and WDie as the node temperature difference WCi, and perform the node temperature difference WCi with the temperature difference threshold WCmax one by one. By comparison, if there is a node with WCi not less than WCmax, the corresponding node will be marked as a dangerous node, and the power grid operation state will be marked as dangerous, and the temperature analysis module will send an alarm signal to the auxiliary analysis platform; if all WCi is less than WCmax, go to the next step; Step S3: analyze the node temperature difference of the power grid to obtain the node difference JCi of the power grid node i, and compare the node difference JCi with the node difference threshold JCmax one by one. If there is a node whose JCi is not less than JCmax, the corresponding node and its adjacent nodes The two nodes are marked as dangerous nodes, and the power grid operation state is marked as dangerous at the same time, and the temperature analysis module sends an alarm signal to the auxiliary analysis platform; if all JCi are less than JCmax, the power grid operation state is determined to be safe. 3. The power grid operation auxiliary analysis system based on wireless passive temperature measurement according to claim 2, is characterized in that, in step S3, the acquisition process of joint difference JCi comprises: A Cartesian coordinate system is established with the distance value as the X axis and the temperature difference between adjacent nodes as the Y axis, and two line segments are drawn in the Cartesian coordinate system with the origin of the Cartesian coordinate system as an endpoint, and the coordinate value of the second endpoint of the first line segment is is (X1, Y1), the value of X1 is the distance value between node i and node i-1, and the value of Y1 is the temperature difference between node i and node i-1; The coordinates of the two endpoints are (X2, Y2), the value of X2 is the distance between node i and node i+1, and the value of Y2 is the temperature difference between node i and node i+1. The angle value of the angle between the two line segments is marked as the pitch difference JCi. 4. The power grid operation auxiliary analysis system based on wireless passive temperature measurement according to claim 1, wherein the standard analysis result is sent to the auxiliary analysis platform in the form of Bdc, wherein B represents the serial number of the power grid, and d represents the corresponding power grid The temperature coefficient of , c represents the temperature difference coefficient of the corresponding power grid; the auxiliary analysis platform sends the standard analysis results to the safety rating module after receiving the standard analysis results. 5. The power grid operation auxiliary analysis system based on wireless passive temperature measurement according to claim 3, wherein the specific process that the safety rating module performs rating analysis on the power grid operation safety state comprises: Select several power grids as rated power grids, and obtain the rating coefficient PJx of the rated power grid by analyzing the temperature coefficient and temperature difference coefficient of the rated power grid. make a judgment. 6. The power grid operation auxiliary analysis system based on wireless passive temperature measurement according to claim 5, is characterized in that, the comparison process of rating coefficient PJx and rating coefficient PJmin, PJmax is: If PJx < PJmin, the safety level of the power grid is determined to be level three; If PJmin≤PJx≤PJmax, the safety level of the power grid is judged to be Level 2; If PJ>PJmax, it is determined that the safety level of the power grid is one level. 7 . The power grid operation auxiliary analysis system based on wireless passive temperature measurement according to claim 6 , wherein the acquisition process of the safety factor comprises: performing regional division, and dividing the safety level in the region into the number of rated power grids with three levels of safety. 8 . Mark it as s3, mark the number of rated power grids with a safety level of level 2 in the area as s2, and mark the number of rated power grids with a safety level of level one in the area as s1, and obtain the area by calculating and analyzing s3, s2 and s1. safety factor. 8. The power grid operation auxiliary analysis system based on wireless passive temperature measurement according to claim 7, wherein the auxiliary analysis platform sends the alarm signal to the maintenance recommendation module after receiving the alarm signal, and the maintenance recommendation module receives the alarm signal Afterwards, recommenders are screened out based on the maintenance personnel's geographic location, working years, and the number of maintenance executions in half a year, and the recommended personnel's identity information is sent to the auxiliary analysis platform. 9. The power grid operation auxiliary analysis system based on wireless passive temperature measurement according to claim 8, wherein the identity information of the maintenance personnel comprises: the maintenance personnel's name, age, mobile phone number, years of employment, maintenance within half a year number of executions.

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