Detection, analysis and early warning system based on intelligent electric power transformation

Abstract

The invention relates to the technical field of electrical engineering, in particular to an intelligent power transformation detection, analysis and early warning system. Comprising an electrical parameter acquisition module, an electrical parameter analysis module, a power transformation equipment influence parameter acquisition module, a power transformation equipment influence parameter analysis module, an electrical performance analysis module, an equipment state monitoring module, an equipment state analysis module, a comprehensive performance analysis module, an early warning module and a management database. According to the system, the electrical performance evaluation coefficient of the power transformation equipment is obtained by analyzing the power qualification degree and the affected degree of the power transformation equipment, the operation state evaluation coefficient of the power transformation equipment is obtained by analyzing the operation state parameters of the power transformation equipment, and the comprehensive performance evaluation index of the power transformation equipment is obtained through comprehensive analysis. Therefore, the comprehensive performance condition of the power transformation equipment can be accurately and timely mastered, the operation stability of the power transformation equipment is improved, and the continuous and reliable power supply is ensured.

Description

Technical Field

[0001] The present invention relates to the field of electrical engineering technology, and in particular to a detection, analysis and early warning system based on smart power substation. Background Art

[0002] In today's digital age, smart power has become an inevitable trend in the development of the power industry. With the rapid development of social economy and the continuous growth of electricity consumption, higher and higher requirements are placed on the quality, reliability and safety of power supply.

[0003] The traditional substation detection mode has many limitations, such as long detection intervals, difficulty in detecting early subtle faults, incomplete data collection and limited analysis capabilities. Smart power relies on the strong support of modern information technology, including high-speed communication networks, intelligent sensors, big data analysis, cloud computing, etc. By widely deploying intelligent sensors in the substation link, multi-dimensional status information of the equipment can be obtained in real time, such as temperature, humidity, current, voltage, etc. These massive amounts of data are processed by advanced data analysis algorithms to discover the potential risks and failure modes hidden therein. At the same time, with the help of artificial intelligence and machine learning technology, the system can self-learn and optimize, and continuously improve the accuracy of detection and early warning.

[0004] The existing Chinese patent application number CN202211203839.6 discloses an intelligent detection system for power transmission and transformation. The information of the power transmission and transformation detection terminal is collected through the information transmission system and transmitted to the data processing module. The data processing module transmits the processed data to the data analysis module, and the data analysis module transmits the processed data to the data output module after analysis according to the specific data model, and presents the power transmission and transformation detection results to the management personnel, realizing real-time monitoring and comprehensive perception of the power transmission and transformation equipment, timely grasping the operating status of the equipment, and providing support for the intelligent development of the power transmission and transformation field. However, there are still some shortcomings, which are specifically manifested in the following aspects: First, the scheme mentions the substation equipment detection sensor, such as detecting the grounding condition, but does not involve the operating status parameters of the substation equipment, such as the degree of heat dissipation, abnormal vibration frequency, the proportion of abnormal frequency points, etc., which may lead to an incomplete evaluation of the operating status of the substation equipment, and it is impossible to accurately grasp the actual situation of the substation equipment in these specific aspects, so that there are certain limitations in equipment maintenance, fault warning, etc., and some potential problems cannot be discovered and handled in time, affecting the safe and stable operation of the substation equipment.

[0005] Second, this plan mainly focuses on the detection and information collection of some other aspects of substation equipment, such as grounding conditions, infrared image detection, environmental information, etc., but ignores some electrical parameters and influencing parameters of substation equipment, such as the power qualification degree and impact degree of substation equipment. This may lead to deficiencies in the comprehensive evaluation of substation equipment and fail to accurately grasp the actual situation of equipment in terms of power and impact, which in turn affects the accurate judgment of equipment operating status and maintenance decisions, and may increase the risk of equipment failure or unstable operation, which to a certain extent reduces the reliability and safety of the entire power transmission and transformation system. Summary of the invention

[0006] In order to overcome the shortcomings of the background technology, an embodiment of the present invention provides a detection, analysis and early warning system based on smart power substation, which can effectively solve the problems involved in the above-mentioned background technology.

[0007] The purpose of the present invention can be achieved through the following technical solutions: The present invention provides a detection, analysis and early warning system based on smart power substation, including: an electrical parameter acquisition module for real-time detection of electrical parameters of each substation equipment, the electrical parameters including active power, reactive power and apparent power.

[0008] The electrical parameter analysis module is used to obtain the power qualification degree of the substation equipment according to the electrical parameter analysis of each substation equipment.

[0009] The substation equipment influencing parameter acquisition module is used to detect the influencing parameters of the substation equipment. The influencing parameters of the substation equipment include the aging degree of the wire insulation performance, the degree of anti-electromagnetic interference, and the degree of influence of temperature and humidity.

[0010] The substation equipment influencing parameter analysis module is used to obtain the degree of influence of the substation equipment according to the substation equipment influencing parameter analysis.

[0011] The electrical performance analysis module obtains the electrical performance evaluation coefficient χ of the substation equipment according to the power qualification degree and the degree of influence of the substation equipment.

[0012] The equipment status monitoring module is used to detect the operating status parameters of the substation equipment. The operating status parameters include the degree of heat dissipation, abnormal vibration frequency, and the proportion of abnormal frequency points.

[0013] The equipment status analysis module is used to obtain the operating status evaluation coefficient ρ of the substation equipment according to the operating status parameter analysis of the substation equipment.

[0014] The comprehensive performance analysis module is used to obtain the comprehensive performance evaluation index of the substation equipment based on the electrical performance evaluation coefficient and the operating status evaluation coefficient of the substation equipment.

[0015] The early warning module is used to determine whether the comprehensive performance evaluation index of the substation equipment is qualified and provide feedback.

[0016] Preferably, the specific analysis method of the electrical parameter acquisition module is: select a number of time points at random according to the set time interval, record them as each time point, and use a voltmeter and an ammeter to detect the voltage and current of each substation at each time point, record them as V im ,I im , where i represents the number of the i-th substation, i=1,2,...,n, and m represents the number of the m-th time point, m=1,2,...,q. Substitute them into the formula Get the active power P of each substation equipment i , reactive power Q i , apparent power S i , where cosΦ represents the set power factor, q represents the number of time points, and sinΦ represents the sine value of the phase difference between voltage and current.

[0017] Preferably, the specific analysis method of the electrical parameter analysis module is: respectively read the active power P of each substation equipment i , reactive power Q i , apparent power S i , substituting it into the formula The power qualification degree δ of the substation equipment is obtained, P', Q', S' respectively represent the reference values ​​of the set active power, reactive power, and apparent power, φ1, φ2, φ3 respectively represent the weight factors of the set active power, reactive power, and apparent power, and n represents the number of substation equipment.

[0018] Preferably, the specific analysis method of the substation equipment influencing parameter acquisition module is: in the first step, the two probes of the insulation resistance tester are respectively connected to the conductor and the insulation layer of each substation equipment wire in turn, a set voltage is applied thereto, and the insulation resistance value of each substation equipment is detected.

[0019] The second step is to calculate the aging degree of the insulation performance of the power substation wires through the formula.

[0020] The third step is to inject interference signals of specific frequency and strength into each substation equipment, and select several monitoring time points at equal time intervals to detect the voltage and current of each substation equipment at each monitoring time point.

[0021] The fourth step is to analyze the voltage and current of each substation at each monitoring time point according to the method of analyzing the active power, reactive power and apparent power of each substation, and calculate the active power, reactive power and apparent power of each substation under electromagnetic interference.

[0022] The fifth step is to analyze the anti-electromagnetic interference degree of the substation equipment according to the active power, reactive power and apparent power of each substation equipment under electromagnetic interference.

[0023] The sixth step is to divide the temperature and humidity levels according to the set temperature and humidity, and monitor the voltage and current of each substation at each temperature level and each monitoring time point, and the voltage and current of each substation at each humidity level at each monitoring time point.

[0024] The seventh step is to analyze the active power, reactive power and apparent power of each substation at each temperature level and the active power, reactive power and apparent power of each substation at each humidity level according to the method of analyzing the active power, reactive power and apparent power of each substation.

[0025] The eighth step is to analyze the influence of temperature and humidity on the substation equipment according to the active power, reactive power, apparent power of each substation equipment at each temperature level and the active power, reactive power, apparent power of each substation equipment at each humidity level.

[0026] Preferably, the specific analysis method of the substation equipment impact analysis module is: respectively read the aging degree of the wire insulation performance, the degree of electromagnetic interference resistance, and the degree of temperature and humidity influence of the substation equipment, and substitute them into the formula The degree of influence ψ of the substation equipment is obtained, where α represents the aging degree of the insulation performance of the substation equipment's wires, β represents the degree of anti-electromagnetic interference, γ represents the degree of influence of temperature and humidity, η1, η2, η3 represent the weight factors of the set aging degree of the insulation performance of the wires, the degree of anti-electromagnetic interference, and the degree of influence of temperature and humidity, respectively, and e represents a natural constant.

[0027] Preferably, the specific analysis method of the electrical performance analysis module is: read the power qualification degree δ of the substation equipment and the impact degree ψ of the substation equipment, and substitute them into the formula The electrical performance evaluation coefficient χ of the substation equipment is obtained, where ω1 and ω2 represent the weight factors of the set power qualification level and the affected level, respectively, and e represents a natural constant.

[0028] Preferably, the specific analysis method of the equipment status monitoring module is as follows: the first step is to detect the temperature of each substation equipment before starting, which is recorded as According to the set duration, several time points are randomly selected from the working time of the substation equipment, which are recorded as temperature time points. The temperature of each temperature time point of each substation equipment is monitored by a temperature sensor, which is recorded as j represents the number of the jth temperature time point, j = 1, 2, ..., k, and substitute it into the formula Get the heat dissipation degree of the substation equipment ζ, represents the temperature of the i-th substation at the j+1-th temperature time point, n represents the number of substations, and k represents the number of temperature time points.

[0029] In the second step, the working time of the substation equipment is divided into unit time periods according to the set time period. The vibration number of each substation equipment in each unit time period is detected by the vibration sensor to obtain the vibration number of each substation equipment in each unit time period, and the abnormal vibration number is screened out. The abnormal vibration frequency of each substation equipment in each unit time period is obtained by dividing the abnormal vibration number of each substation equipment in each unit time period by the set time period, and the abnormal vibration frequency of each substation equipment in each unit time period is obtained by taking the average value, which is recorded as F i , through the formula The abnormal vibration frequency F of the substation equipment is obtained, n represents the number of substation equipment, and the decibel value of each frequency point of each substation equipment is monitored in real time by a noise meter, from which the number of abnormal noise frequency points of each substation equipment is screened out, recorded as σ i , through the formula Get the proportion of abnormal frequency points of substation equipment ξ, σ 总 Indicates the total number of set frequency points.

[0030] Preferably, the specific analysis method of the equipment status analysis module is: reading the heat dissipation degree of the substation equipment The abnormal vibration frequency F and the proportion of abnormal frequency points ξ are calculated by the formula The operating status evaluation coefficient ρ of the substation equipment is obtained, F' represents the maximum allowable value of the abnormal vibration frequency, κ1 and κ2 represent the weight factors of the set heat dissipation degree and abnormal vibration frequency respectively, and e represents a natural constant.

[0031] Preferably, the specific analysis method of the comprehensive performance analysis module is: respectively read the electrical performance evaluation coefficient χ and the operating status evaluation coefficient ρ of the substation equipment, and substitute them into the formula Get the comprehensive performance evaluation index of substation equipment w1 and w2 represent the weight factors of the set electrical performance evaluation coefficient and operating status evaluation coefficient respectively.

[0032] Preferably, the specific analysis method of the early warning module is: reading the comprehensive performance evaluation index of the substation equipment, comparing it with the preset comprehensive performance evaluation index threshold; if the comprehensive performance evaluation index of the substation equipment is greater than or equal to the preset comprehensive performance evaluation index threshold, it means that the comprehensive performance evaluation index of the substation equipment is qualified; if the comprehensive performance evaluation index of the substation equipment is less than the preset comprehensive performance evaluation index threshold, it means that the comprehensive performance evaluation index of the substation equipment is unqualified, and feedback is given to the system.

[0033] Management database, used to store the factory value of insulation resistance of each substation equipment.

[0034] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention obtains the electrical performance evaluation coefficient of the substation equipment by analyzing the power qualification degree and the degree of influence of the substation equipment, which can comprehensively evaluate the electrical performance of the substation equipment and help to timely discover potential problems and performance defects of the equipment.

[0035] 2. The present invention obtains the operating status evaluation coefficient of the substation equipment by analyzing the operating status parameters of the substation equipment, and can timely detect subtle changes in the operating status of the substation equipment, so as to warn potential problems in advance and prevent them before they occur.

[0036] 3. The present invention obtains the comprehensive performance evaluation index of the substation equipment based on the electrical performance evaluation coefficient and the operation status evaluation coefficient of the substation equipment, thereby judging whether the comprehensive performance evaluation index of the substation equipment meets the early warning conditions and providing feedback. It can accurately and timely grasp the comprehensive performance status of the substation equipment, fully understand the actual situation of the equipment, improve the safety and stability of the operation of the substation equipment, and ensure the continuous and reliable supply of electricity. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0038] Figure 1 This is a system module connection diagram of the present invention.

[0039] Figure 2 for Figure 1 Flow chart of the module for obtaining parameters affecting medium-sized power transformation equipment.

[0040] Figure 3 for Figure 1 Conditional flow chart of the early warning module. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] See also Figure 1As shown, a detection, analysis and early warning system based on smart power substation includes an electrical parameter acquisition module, an electrical parameter analysis module, a substation equipment influencing parameter acquisition module, a substation equipment influencing parameter analysis module, an electrical performance analysis module, an equipment status monitoring module, an equipment status analysis module, a comprehensive performance analysis module, an early warning module, and a management database.

[0043] The management database is connected to the electrical parameter analysis module, the substation equipment influencing parameter analysis module, the electrical performance analysis module, the equipment status analysis module, and the comprehensive performance analysis module; the electrical performance analysis module is connected to the substation equipment influencing parameter analysis module and the comprehensive performance analysis module; the substation equipment influencing parameter acquisition module is connected to the substation equipment influencing parameter analysis module; the electrical parameter analysis module is connected to the electrical parameter acquisition module and the comprehensive performance analysis module; the early warning module is connected to the management database; the comprehensive performance analysis module is connected to the electrical parameter analysis module, the substation equipment influencing parameter analysis module, the electrical performance analysis module, and the equipment status analysis module; and the equipment status monitoring module is connected to the equipment status analysis module.

[0044] The electrical parameter acquisition module is used to perform real-time detection of the electrical parameters of each substation equipment. The electrical parameters include active power, reactive power, and apparent power.

[0045] The specific analysis method of the electrical parameter acquisition module is: select a number of time points at random according to the set time interval, record them as each time point, and use a voltmeter and an ammeter to detect the voltage and current of each substation at each time point, record them as V im ,I im , where i represents the number of the i-th substation, i=1,2,...,n, and m represents the number of the m-th time point, m=1,2,...,q. Substitute them into the formula Get the active power P of each substation equipment i , reactive power Q i , apparent power S i , where cosΦ represents the set power factor, q represents the number of time points, and sinΦ represents the sine value of the phase difference between voltage and current; continuous monitoring can promptly detect abnormal voltage, current or power changes, provide early warning for possible equipment failures, facilitate timely maintenance measures, and reduce the probability and impact of failures.

[0046] It should be noted that the variable active power represents the actual work capability of the substation equipment. A larger active power usually means that the electrical equipment has a stronger output or working capacity. The size of the reactive power will affect the power factor. Excessive reactive power may lead to a decrease in the power factor, affecting the efficiency of electric energy utilization and the quality of the power grid. The apparent power represents the total power capacity demand of the electrical system, and its size is closely related to the load capacity and capacity planning of the system.

[0047] It should be noted that the specific analysis method of the voltage and current phase difference is: in an AC circuit, when current and voltage pass through components of different properties, their changes are not completely synchronized, and there will be a certain time delay or advance. This time difference is manifested as a phase difference. For example, in a circuit containing inductance, the current will usually lag behind the voltage by a certain phase, while in a circuit containing capacitance, the current may lead the voltage by a certain phase.

[0048] It should be noted that, in a specific embodiment, for an RL series circuit, assuming that the resistance R is 10Ω, the inductance L is 1H, the power supply voltage is V=100sin(ω*t), t represents the basic variable used to describe the change of current over time, the inductive reactance of the inductor is XL=ω*L, ω is the angular frequency, and the current The tangent of the phase angle of the current lagging behind the voltage is Assuming the angular frequency ω = 10 rad / s, the tangent of the phase angle is The phase angle can be calculated to be approximately 45 degrees.

[0049] The electrical parameter analysis module is used to obtain the power qualification degree of the substation equipment according to the electrical parameter analysis of each substation equipment.

[0050] The specific analysis method of the electrical parameter analysis module is: read the active power P of each substation equipment respectively. i , reactive power Q i , apparent power S i , substituting it into the formula The power qualification degree δ of the substation equipment is obtained, where P', Q', and S' represent the reference values ​​of the set active power, reactive power, and apparent power, respectively; φ1, φ2, and φ3 represent the weight factors of the set active power, reactive power, and apparent power, respectively; and n represents the number of substation equipment. The power qualification degree of the substation equipment can be accurately measured to clarify whether it meets the set standards, so as to promptly discover non-compliance situations, which is helpful to effectively control the power quality of the substation equipment, ensure its operation within a reasonable range, and ensure the stability and reliability of the power system.

[0051] It should be noted that, in a specific embodiment, φ1 can be set to 0.4, φ2 can be set to 0.3, and φ3 can be set to 0.3. Active power is usually a more critical indicator, which directly reflects the useful power actually output or consumed by the equipment. Although reactive power itself does not directly do work, it has an important impact on the stable operation of the power grid and the power factor. Apparent power comprehensively considers active power and reactive power. In some cases, such as measuring equipment capacity, it is of great significance. Therefore, the weight corresponding to active power is higher, and the weights corresponding to reactive power and apparent power are equal.

[0052] It should be noted that the specific analysis method of the reference values ​​of active power, reactive power and apparent power is as follows: In a specific embodiment, in a substation, it is known that the rated capacity of the transformer is 1000kVA. According to previous operation data and experience, the active power generally fluctuates around 600kW during normal operation. In order to ensure the safe and stable operation of the transformer and a good power factor, the active power reference value is set to 600kW. At the same time, it is hoped that the power factor is maintained at around 0.95. The reactive power reference value is calculated to be about 180kvar. In this way, the apparent power reference value can be obtained by the formula To calculate, it is about 630kVA.

[0053] The substation equipment influencing parameter acquisition module is used to detect the influencing parameters of the substation equipment. The influencing parameters of the substation equipment include the aging degree of the wire insulation performance, the degree of anti-electromagnetic interference, and the degree of influence of temperature and humidity.

[0054] See also Figure 2 As shown, the specific analysis method of the substation equipment influencing parameter acquisition module is: the first step is to connect the two probes of the insulation resistance tester to the conductor and the insulation layer of the electric wires of each substation equipment in turn, apply a set voltage to it, and detect the insulation resistance value of each substation equipment; timely discover poor insulation, avoid leakage, short circuit and other faults caused by insulation failure, reduce safety risks, and ensure the safety of personnel and equipment.

[0055] The second step is to calculate the aging degree of the insulation performance of the substation's wires through a formula; this helps to detect insulation degradation or aging as early as possible so that maintenance or replacement measures can be taken in time to prevent failures and safety accidents caused by insulation problems.

[0056] It should be noted that the specific analysis method for the aging degree of the insulation performance of the power substation equipment is as follows: read the insulation resistance value of each power substation equipment and record it as R i , substituting it into the formula Get the aging degree of the insulation performance of the power transformer equipment, α, where R i0It indicates the factory value of the insulation resistance of the i-th substation equipment, and n indicates the number of substation equipment.

[0057] The third step is to inject interference signals of specific frequency and intensity into each substation equipment, and select several monitoring time points at equal time intervals to detect the voltage and current of each substation equipment at each monitoring time point. This can help understand the actual operating status and response of the substation equipment when it is subjected to specific interference signals, and help to accurately evaluate the working performance and stability of the substation equipment in complex electromagnetic environments.

[0058] The fourth step is to analyze the voltage and current of each substation at each monitoring time point according to the method of analyzing the active power, reactive power and apparent power of each substation, and calculate the active power, reactive power and apparent power of each substation under electromagnetic interference respectively; the active power can reflect the actual working efficiency of the equipment, which is convenient for evaluating its working efficiency. According to the reactive power situation, reactive power compensation planning can be better carried out to improve the power quality. The apparent power helps to determine the capacity and load carrying capacity required by the power grid, and provides a basis for power grid planning.

[0059] The fifth step is to analyze the degree of electromagnetic interference resistance of the substation equipment according to the active power, reactive power and apparent power of each substation equipment under electromagnetic interference; this helps to ensure the stable operation of the substation equipment in a complex electromagnetic environment, reduce failures and fluctuations caused by electromagnetic interference, discover the deficiencies in the anti-interference ability of the substation equipment in advance, and take timely measures for early warning and prevention.

[0060] It should be noted that the specific analysis method of the anti-electromagnetic interference performance of the substation equipment is: read the active power, reactive power and apparent power of each substation equipment under electromagnetic interference, respectively recorded as P" i , Q” i , S” i , substituting it into the formula

[0062] Get the anti-electromagnetic interference degree β of the substation equipment, They respectively represent the weight factors of active power, reactive power and apparent power of substation equipment under the set electromagnetic interference.

[0063] It should be noted that, in a specific embodiment, It can be set to 0.2. It can be set to 0.3. It can be set to 0.5. The active power may have a relatively low weight because electromagnetic interference often does not mainly affect the ability of the device to output or consume active power, but more on signals and control. Although reactive power is related to some electromagnetic phenomena, its direct correlation with electromagnetic interference resistance is not the strongest. Apparent power reflects the overall power situation of the equipment to a certain extent. Because electromagnetic interference may cause the instability of the entire power state, apparent power can comprehensively reflect this change. Therefore, the weight corresponding to apparent power is higher, the weight corresponding to reactive power is second, and the weight corresponding to active power is lower.

[0064] The sixth step is to divide the temperature and humidity levels according to the set temperature and humidity, and monitor the voltage and current of each substation equipment at each temperature level and each monitoring time point, and the voltage and current of each substation equipment at each humidity level at each monitoring time point respectively; it can fully grasp the performance of substation equipment under various conditions, help to discover in advance the adverse effects that specific temperature and humidity environments may have on the equipment, so as to take measures to ensure the reliable operation of the equipment.

[0065] The seventh step is to analyze the active power, reactive power and apparent power of each substation at each temperature level and the active power, reactive power and apparent power of each substation at each humidity level according to the method of analyzing the active power, reactive power and apparent power of each substation. This helps to discover potential problems in advance, such as abnormal power fluctuations at certain temperature and humidity levels, so that timely intervention can be made.

[0066] The eighth step is to analyze the influence of temperature and humidity on the substation equipment according to the active power, reactive power, apparent power of each substation equipment at each temperature level and the active power, reactive power, apparent power of each substation equipment at each humidity level; this helps to take targeted measures to optimize the equipment operating environment and improve equipment reliability and stability.

[0067] It should be noted that the specific analysis method of the influence of temperature and humidity on the substation equipment is: read the active power, reactive power, apparent power of each substation equipment at each temperature level and the active power, reactive power, apparent power of each substation equipment at each humidity level, and record them as and Where f represents the number of the f-th temperature level, f = 1, 2, ..., l, h represents the number of the h-th humidity level, h = 1, 2, ..., g, and substitute it into the formula

[0068] Get the temperature influence degree of substation equipment γ 温度 , Humidity influence degree γ 湿度, μ1, μ2, and μ3 represent the weight factors of active power, reactive power, and apparent power under the influence of set temperature and humidity, respectively. The influence degree γ of temperature and humidity on substation equipment is obtained.

[0069] It should be noted that in a specific embodiment, μ1 can be set to 0.2, μ2 can be set to 0.3, and μ3 can be set to 0.5. Under the influence of the set temperature and humidity, the weight of active power is usually relatively low, because the direct impact of temperature and humidity on active power is relatively small. Changes in temperature and humidity may affect related parts such as reactive compensation to a certain extent, and thus affect reactive power, while the impact on apparent power will be greater. Temperature and humidity may have a wider impact on the overall performance and operating status of substation equipment, which is more directly reflected in the change of apparent power. Therefore, the weight corresponding to apparent power is higher, the weight corresponding to reactive power is second, and the weight corresponding to active power is lower.

[0070] The substation equipment influencing parameter analysis module is used to obtain the degree of influence of the substation equipment according to the substation equipment influencing parameter analysis.

[0071] The specific analysis method of the substation equipment impact analysis module is: respectively read the aging degree of the wire insulation performance, the degree of electromagnetic interference resistance, and the degree of temperature and humidity influence of the substation equipment, and substitute them into the formula The degree of influence ψ of the substation equipment is obtained, where α represents the aging degree of the insulation performance of the substation equipment's wires, β represents the degree of anti-electromagnetic interference, γ represents the degree of influence of temperature and humidity, η1, η2, η3 represent the weight factors of the set aging degree of the insulation performance of the wires, the degree of anti-electromagnetic interference, and the degree of influence of temperature and humidity, respectively, and e represents a natural constant; by comprehensively considering important factors such as the aging of the insulation performance of the wires, anti-electromagnetic interference, and temperature and humidity, and comprehensively evaluating the equipment status, it is helpful to promptly discover the greater risks that the equipment may face and prepare countermeasures in advance.

[0072] It should be noted that in a specific embodiment, η1 can be set to 0.4, η2 can be set to 0.4, and η3 can be set to 0.2. The aging of insulation performance may directly lead to serious problems such as leakage and short circuit, posing a major threat to the safe operation and performance of substation equipment. The degree of anti-electromagnetic interference is also relatively important. In a complex electromagnetic environment, strong electromagnetic interference may cause equipment malfunction, signal distortion and other problems, affecting the normal operation of substation equipment. Although temperature and humidity will also have a certain impact on substation equipment, such as affecting equipment life and operational stability, they are usually not as direct and critical as the first two. Therefore, the weights corresponding to the aging degree of wire insulation performance and the degree of anti-electromagnetic interference are equal, and the weight corresponding to the degree of temperature and humidity influence is lower.

[0073] The electrical performance analysis module obtains the electrical performance evaluation coefficient χ of the substation equipment according to the power qualification degree and the degree of influence of the substation equipment.

[0074] The specific analysis method of the electrical performance analysis module is: read the power qualification degree δ of the substation equipment and the impact degree ψ of the substation equipment, and substitute them into the formula The electrical performance evaluation coefficient χ of the substation equipment is obtained, where ω1 and ω2 represent the weight factors of the set power qualification level and the affected level respectively, and e represents a natural constant. This method can analyze the specific situation of the equipment in detail, provide a basis for precise maintenance and management, and help to promptly discover potential problems in electrical performance and take countermeasures in advance.

[0075] It should be noted that in a specific embodiment, ω1 can be set to 0.6 and ω2 can be set to 0.4. Whether the power is qualified is directly related to whether the substation equipment can output electric energy normally and stably, and is a reflection of its core function. If the power is unqualified, it may cause a series of serious problems and have a significant impact on the entire power system. The degree of impact cannot be ignored. It reflects the performance of the substation equipment under various external factors, but relatively speaking, it may not be as critical as the power qualification degree. Therefore, the weight corresponding to the power qualification degree is slightly higher than the weight corresponding to the degree of impact.

[0076] The equipment status monitoring module is used to detect the operating status parameters of the substation equipment. The operating status parameters include the degree of heat dissipation, abnormal vibration frequency, and the proportion of abnormal frequency points.

[0077] The specific analysis method of the equipment status monitoring module is as follows: the first step is to detect the temperature of each substation equipment before starting, recorded as According to the set duration, several time points are randomly selected from the working time of the substation equipment, which are recorded as temperature time points. The temperature of each temperature time point of each substation equipment is monitored by a temperature sensor, which is recorded as j represents the number of the jth temperature time point, j = 1, 2, ..., k, and substitute it into the formula Get the heat dissipation degree of substation equipment It represents the temperature of the i-th substation at the j+1-th temperature time point, n represents the number of substations, and k represents the number of temperature time points. It can accurately understand the temperature of substations at different time points, fully grasp their heat dissipation status, and promptly discover possible heat dissipation problems, so as to take measures in advance to avoid damage to equipment due to overheating.

[0078] In the second step, the working time of the substation equipment is divided into unit time periods according to the set time period. The vibration number of each substation equipment in each unit time period is detected by the vibration sensor to obtain the vibration number of each substation equipment in each unit time period, and the abnormal vibration number is screened out. The abnormal vibration frequency of each substation equipment in each unit time period is obtained by dividing the abnormal vibration number of each substation equipment in each unit time period by the set time period, and the abnormal vibration frequency of each substation equipment in each unit time period is obtained by taking the average value, which is recorded as F i , through the formula The abnormal vibration frequency F of the substation equipment is obtained, n represents the number of substation equipment, and the decibel value of each frequency point of each substation equipment is monitored in real time by a noise meter, from which the number of abnormal noise frequency points of each substation equipment is screened out, recorded as σ i , through the formula Get the proportion of abnormal frequency points of substation equipment ξ, σ 总 Indicates the total number of set frequency points; by detecting the number and frequency of abnormal vibrations, potential mechanical problems of the equipment can be quickly detected, which helps to deal with faults that may be caused by abnormal vibrations in advance and maintain stable operation of the equipment.

[0079] It should be noted that the specific analysis method for screening out the number of abnormal vibrations is: respectively record the amplitude of each vibration of each substation in each unit time period, read the normal amplitude range of vibration of the substation when working from the management database, compare the amplitude of each vibration of each substation in each unit time period with the normal amplitude range of vibration of the substation when working, screen out the number of vibrations of each substation in each unit time period whose amplitude is not within the normal amplitude range of vibration of the substation when working, record it as the number of abnormal vibrations, and obtain the number of abnormal vibrations of each substation in each unit time period.

[0080] It should be noted that the specific analysis method for screening out the number of abnormal noise frequency points of each substation equipment is as follows: the decibel value of each frequency point of each substation equipment is compared with the set maximum decibel value of the substation equipment, and the frequency points whose decibel values ​​are greater than the set maximum decibel value of the substation equipment are screened out, and recorded as abnormal noise frequency points, and the number of abnormal noise frequency points of each substation equipment is counted, recorded as σ i .

[0081] The equipment status analysis module is used to obtain the operating status evaluation coefficient ρ of the substation equipment according to the operating status parameter analysis of the substation equipment.

[0082] The specific analysis method of the equipment status analysis module is: reading the heat dissipation degree of the substation equipment The abnormal vibration frequency F and the proportion of abnormal frequency points ξ are calculated by the formula The operating status evaluation coefficient ρ of the substation equipment is obtained, where F' represents the maximum allowable value of the abnormal vibration frequency, κ1 and κ2 represent the weight factors of the set heat dissipation degree and abnormal vibration frequency, respectively, and e represents a natural constant. Through the change of the operating status evaluation coefficient, possible abnormalities of the substation equipment can be discovered in time, which helps to maintain the good operating status of the substation equipment, thereby improving the safety and reliability of the entire power system.

[0083] It should be noted that in a specific embodiment, κ1 can be set to 0.6 and κ2 can be set to 0.4. Good heat dissipation is crucial to the normal operation and life of substation equipment. Poor heat dissipation may cause equipment overheating, leading to failures or even damage to the equipment. Abnormal vibration may indicate that there are some potential problems with the equipment, but its urgency and direct impact may be slightly weaker than heat dissipation. Therefore, the weight corresponding to the degree of good heat dissipation is higher.

[0084] It should be noted that the specific analysis method of the maximum allowable value of the abnormal vibration frequency is: read the abnormal vibration frequency of each substation equipment, recorded as F i , and read the abnormal vibration frequency F of the substation equipment at the same time, through the formula The maximum allowable value F' of the abnormal vibration frequency is obtained, ε1 and ε2 represent the set abnormal vibration frequency standard deviation and the weight factor of the abnormal vibration frequency respectively, and ε1+ε2=1.

[0085] It should be noted that, in a specific embodiment, ε1 can be set to 0.6, ε2 can be set to 0.4, and the standard deviation of the abnormal vibration frequency mainly reflects the discreteness or fluctuation of the abnormal vibration frequency, which is of great significance for evaluating the stability and consistency of the abnormal vibration. It more directly reflects the degree to which the vibration frequency deviates from the normal range, and is a key indicator for judging whether it exceeds the maximum allowable value. The abnormal vibration frequency represents the overall level of the abnormal vibration frequency, which can assist in judging the law and trend of the abnormal vibration. In some cases, it is also important for comprehensively evaluating the abnormal vibration condition. Therefore, the weight corresponding to the standard deviation of the abnormal vibration frequency is slightly higher than the weight corresponding to the abnormal vibration frequency.

[0086] The comprehensive performance analysis module is used to obtain the comprehensive performance evaluation index of the substation equipment based on the electrical performance evaluation coefficient and the operating status evaluation coefficient of the substation equipment.

[0087] The specific analysis method of the comprehensive performance analysis module is: read the electrical performance evaluation coefficient χ and the operating status evaluation coefficient ρ of the substation equipment respectively, and substitute them into the formula Get the comprehensive performance evaluation index of substation equipment w1 and w2 represent the weight factors of the set electrical performance evaluation coefficient and operating status evaluation coefficient respectively; they can more comprehensively and accurately reflect the comprehensive performance of the substation equipment, help ensure the good operation of the substation equipment, and thus ensure the stability and reliability of the entire power system.

[0088] It should be noted that, in a specific embodiment, w1 can be set to 0.5, w2 can be set to 0.5, the electrical performance is directly related to the functional realization and safety of the equipment, such as voltage stability, current carrying capacity and other aspects, and the operating status includes heat dissipation, vibration and other conditions, which will also have a key impact on the long-term stable operation of the equipment. In order to more comprehensively evaluate the comprehensive performance of the substation equipment, the weights corresponding to the electrical performance evaluation coefficient and the operating status evaluation coefficient are equal.

[0089] The early warning module is used to determine whether the comprehensive performance evaluation index of the substation equipment is qualified and provide feedback.

[0090] See also Figure 3 As shown, the specific analysis method of the early warning module is: reading the comprehensive performance evaluation index of the substation equipment, comparing it with the preset comprehensive performance evaluation index threshold, if the comprehensive performance evaluation index of the substation equipment is greater than or equal to the preset comprehensive performance evaluation index threshold, it means that the comprehensive performance evaluation index of the substation equipment is qualified, if the comprehensive performance evaluation index of the substation equipment is less than the preset comprehensive performance evaluation index threshold, it means that the comprehensive performance evaluation index of the substation equipment is unqualified, and feedback is given to the system; it can quickly determine whether the equipment performance meets the requirements, improve work efficiency, help ensure that the substation equipment is always in a qualified performance state, and ensure the safe and stable operation of the power system.

[0091] Management database, used to store the factory value of insulation resistance of each substation equipment.

[0092] The present invention obtains the electrical performance evaluation coefficient of the substation equipment by analyzing the power qualification degree and the degree of influence of the substation equipment, obtains the operation status evaluation coefficient of the substation equipment by analyzing the operation status parameters of the substation equipment, and then obtains the comprehensive performance evaluation index of the substation equipment through comprehensive analysis, and judges whether the comprehensive performance evaluation index of the substation equipment is qualified, thereby providing feedback, which can accurately and timely grasp the comprehensive performance status of the substation equipment, comprehensively understand the actual situation of the equipment, improve the safety and stability of the operation of the substation equipment, and ensure the continuous and reliable power supply.

[0093] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention and they are still covered by the protection scope of the present invention.

Claims

1. A detection, analysis and early warning system based on smart power substation, characterized in that: The system specifically includes the following modules: The electrical parameter acquisition module is used to detect the electrical parameters of each substation in real time. The electrical parameters include active power, reactive power, and apparent power. The electrical parameter analysis module is used to obtain the power qualification degree of each substation equipment according to the electrical parameter analysis of each substation equipment; The substation equipment influencing parameter acquisition module is used to detect the influencing parameters of the substation equipment. The influencing parameters of the substation equipment include the aging degree of the insulation performance of the wires, the degree of anti-electromagnetic interference, and the degree of influence of temperature and humidity; A substation equipment impact parameter analysis module is used to obtain the impact degree of the substation equipment according to the substation equipment impact parameter analysis; The electrical performance analysis module obtains the electrical performance evaluation coefficient χ of the substation equipment according to the power qualification degree and the degree of influence of the substation equipment; The equipment status monitoring module is used to detect the operating status parameters of the substation equipment, including the degree of heat dissipation, abnormal vibration frequency, and the proportion of abnormal frequency points; The equipment status analysis module is used to obtain the operating status evaluation coefficient ρ of the substation equipment according to the operating status parameters of the substation equipment; A comprehensive performance analysis module is used to obtain a comprehensive performance evaluation index of the substation equipment based on the electrical performance evaluation coefficient and the operating status evaluation coefficient of the substation equipment; The early warning module is used to determine whether the comprehensive performance evaluation index of the substation equipment is qualified and provide feedback; Management database, used to store the factory value of insulation resistance of each substation equipment.

2. According to claim 1, a smart power substation detection, analysis and early warning system is characterized in that: The specific analysis method of the electrical parameter acquisition module is: According to the set time interval, several time points are randomly selected and recorded as each time point. The voltage and current of each substation equipment at each time point are detected by a voltmeter and an ammeter, respectively, and recorded as V im ,I im , where i represents the number of the i-th substation, i=1,2,...,n, and m represents the number of the m-th time point, m=1,2,...,q. Substitute them into the formula Get the active power P of each substation equipment i , reactive power Q i , apparent power S i , where cosΦ represents the set power factor, q represents the number of time points, and sinΦ represents the sine value of the phase difference between voltage and current.

3. According to claim 2, a smart power substation detection, analysis and early warning system is characterized in that: The specific analysis method of the electrical parameter analysis module is: Read the active power P of each substation equipment separately i , reactive power Q i , apparent power S i , substituting it into the formula The power qualification degree δ of the substation equipment is obtained, P', Q', S' respectively represent the reference values ​​of the set active power, reactive power, and apparent power, φ1, φ2, φ3 respectively represent the weight factors of the set active power, reactive power, and apparent power, and n represents the number of substation equipment.

4. According to claim 3, the intelligent power substation detection, analysis and early warning system is characterized in that: The specific analysis method of the substation equipment influencing parameter acquisition module is as follows: The first step is to connect the two probes of the insulation resistance tester to the conductor and the insulation layer of the power transformer wires in turn, apply a set voltage to them, and detect the insulation resistance value of each power transformer; The second step is to calculate the aging degree of the insulation performance of the power transformer equipment through the formula; The third step is to inject interference signals of specific frequency and strength into each substation, and take several monitoring time points at equal time intervals to detect the voltage and current of each substation at each monitoring time point. The fourth step is to analyze the voltage and current of each substation at each monitoring time point according to the method of analyzing the active power, reactive power and apparent power of each substation, and calculate the active power, reactive power and apparent power of each substation under electromagnetic interference respectively; The fifth step is to analyze the anti-electromagnetic interference degree of the substation equipment according to the active power, reactive power and apparent power of each substation equipment under electromagnetic interference; Step 6: Divide the temperature and humidity levels according to the set temperature and humidity, and monitor the voltage and current of each substation at each monitoring time point at each temperature level and the voltage and current of each substation at each monitoring time point at each humidity level; Step 7: According to the method of analyzing the active power, reactive power and apparent power of each substation, the active power, reactive power and apparent power of each substation at each temperature level and the active power, reactive power and apparent power of each substation at each humidity level are analyzed; The eighth step is to analyze the influence of temperature and humidity on the substation equipment according to the active power, reactive power, apparent power of each substation equipment at each temperature level and the active power, reactive power, apparent power of each substation equipment at each humidity level.

5. According to claim 4, a smart power substation detection, analysis and early warning system is characterized in that: The specific analysis method of the substation equipment impact analysis module is as follows: Read the aging degree of the insulation performance of the substation's wires, the degree of electromagnetic interference resistance, and the degree of influence of temperature and humidity respectively, and substitute them into the formula The degree of influence ψ of the substation equipment is obtained, where α represents the aging degree of the insulation performance of the substation equipment's wires, β represents the degree of anti-electromagnetic interference, γ represents the degree of influence of temperature and humidity, η1, η2, η3 represent the weight factors of the set aging degree of the insulation performance of the wires, the degree of anti-electromagnetic interference, and the degree of influence of temperature and humidity, respectively, and e represents a natural constant.

6. The intelligent power substation detection, analysis and early warning system according to claim 5 is characterized in that: The specific analysis method of the electrical performance analysis module is: Read the power qualification degree δ and the impact degree ψ of the substation equipment, and substitute them into the formula The electrical performance evaluation coefficient χ of the substation equipment is obtained, where ω1 and ω2 represent the weight factors of the set power qualification level and the affected level, respectively, and e represents a natural constant.

7. The intelligent power substation detection, analysis and early warning system according to claim 6 is characterized in that: The specific analysis method of the equipment status monitoring module is: The first step is to detect the temperature of each substation equipment before starting, which is recorded as According to the set duration, several time points are randomly selected from the working time of the substation equipment, which are recorded as temperature time points. The temperature of each temperature time point of each substation equipment is monitored by a temperature sensor, which is recorded as j represents the number of the jth temperature time point, j = 1, 2, ..., k, and substitute it into the formula Get the heat dissipation degree of substation equipment represents the temperature of the i-th substation at the j+1-th temperature time point, n represents the number of substations, and k represents the number of temperature time points; In the second step, the working time of the substation equipment is divided into unit time periods according to the set time period. The vibration number of each substation equipment in each unit time period is detected by the vibration sensor to obtain the vibration number of each substation equipment in each unit time period, and the abnormal vibration number is screened out. The abnormal vibration frequency of each substation equipment in each unit time period is obtained by dividing the abnormal vibration number of each substation equipment in each unit time period by the set time period, and the abnormal vibration frequency of each substation equipment in each unit time period is obtained by taking the average value, which is recorded as F i , through the formula The abnormal vibration frequency F of the substation equipment is obtained, n represents the number of substation equipment, and the decibel value of each frequency point of each substation equipment is monitored in real time by a noise meter, from which the number of abnormal noise frequency points of each substation equipment is screened out, recorded as σ i , through the formula Get the proportion of abnormal frequency points of substation equipment ξ, σ 总 Indicates the total number of set frequency points.

8. The intelligent power substation detection, analysis and early warning system according to claim 7 is characterized in that: The specific analysis method of the device status analysis module is: Read the heat dissipation status of substation equipment The abnormal vibration frequency F and the proportion of abnormal frequency points ξ are calculated by the formula The operating status evaluation coefficient ρ of the substation equipment is obtained, F' represents the maximum allowable value of the abnormal vibration frequency, κ1 and κ2 represent the weight factors of the set heat dissipation degree and abnormal vibration frequency respectively, and e represents a natural constant.

9. The intelligent power substation detection, analysis and early warning system according to claim 1 is characterized in that: The specific analysis method of the comprehensive performance analysis module is: Read the electrical performance evaluation coefficient χ and the operating status evaluation coefficient ρ of the substation equipment respectively, and substitute them into the formula Get the comprehensive performance evaluation index of substation equipment w1 and w2 represent the weight factors of the set electrical performance evaluation coefficient and operating status evaluation coefficient respectively.

10. The intelligent power substation detection, analysis and early warning system according to claim 9 is characterized in that: The specific analysis method of the early warning module is: The comprehensive performance evaluation index of the substation equipment is read and compared with the preset comprehensive performance evaluation index threshold. If the comprehensive performance evaluation index of the substation equipment is greater than or equal to the preset comprehensive performance evaluation index threshold, it means that the comprehensive performance evaluation index of the substation equipment is qualified. If the comprehensive performance evaluation index of the substation equipment is less than the preset comprehensive performance evaluation index threshold, it means that the comprehensive performance evaluation index of the substation equipment is unqualified, and feedback is given to the system.

Images