Highway electric energy quality early warning system

Abstract

The embodiment of the invention discloses a highway electric energy quality early warning system, and relates to the field of electric energy quality early warning. The system comprises a monitoring data acquisition module of each block of the expressway, wherein each monitoring data acquisition unit comprises a block geographical environment query unit, a block weather data acquisition unit and a block electric energy quality index acquisition unit; the data cleaning module of each block of the expressway is used for cleaning abnormal data, repeated data and missing data of the data acquired by the monitoring data acquisition module of the same block; the electric energy quality prediction module of each block of the expressway comprises an electric energy quality prediction unit and an electric energy quality early warning threshold setting unit; an electric energy quality early warning module of each block of the expressway, wherein the electric energy quality early warning module comprises a monitoring data real-time warning unit and a prediction data early warning unit; and the electric energy quality evaluation module is used for evaluating the electric energy quality. According to the embodiment, the accuracy and difference of early warning are improved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of power quality early warning, and in particular to a highway power quality early warning system. Background Art

[0002] In recent years, with the rapid development of highways, the number of electromechanical equipment on highways has also increased (such as transformers, tunnel lamps, electromechanical products and uninterruptible power supplies), which have become more sensitive to the power quality of the distribution network and require higher and higher power quality. Although uninterruptible power supplies (including UPS and EPS) provide high reliability of power supply for electromechanical equipment, their nonlinear characteristics will produce harmonic pollution, among which high-order harmonics have great interference with communication transmission equipment and high-performance servers in electromechanical equipment, and low-order harmonics will reduce the service life of transformer equipment and lines. In addition, tunnel lamps, transformers, electromechanical products and other equipment will also produce harmonic pollution, so the power quality of highways faces great challenges.

[0003] The current online power quality monitoring technology is becoming increasingly mature. The power quality index data provided by the monitoring system can be used to judge the power quality of each monitoring point. How to improve the accuracy and differentiation of early warning is the key to the current power quality early warning. Summary of the invention

[0004] The embodiment of the present invention provides a highway power quality early warning system to solve the above technical problems.

[0005] A highway power quality early warning system, comprising:

[0006] The monitoring data collection module of each block of the expressway, each monitoring data collection unit includes a block geographic environment query unit, a block weather data collection unit and a block power quality index collection unit, wherein the block geographic environment query unit is used to query the geographic environment of the current block; the block weather data collection unit is used to collect weather data of the current block, and the block power quality index collection unit is used to collect power quality index data of the current block;

[0007] The data cleaning module of each block of the highway is used to clean the data collected by the monitoring data collection module of the same block for abnormal data, duplicate data and missing data;

[0008] The power quality prediction module of each block of the highway includes a power quality prediction unit and a power quality warning threshold setting unit; wherein the power quality prediction unit is used to predict the future power quality index data of the current block according to the geographical environment of the current block, as well as the cleaned weather data and historical power quality index data; the power quality warning threshold setting unit is used to set the warning threshold of the current block according to the cleaned historical power quality index data of the current block;

[0009] The power quality early warning module of each block of the expressway includes a monitoring data real-time alarm unit and a prediction data early warning unit; wherein the monitoring data real-time alarm unit is used to issue a real-time alarm for the real-time power quality index data monitored by the current block according to the early warning threshold of the current block; the prediction data early warning unit is used to issue an early warning for the future power quality index data predicted by the current block according to the early warning threshold of the current block;

[0010] The power quality assessment module is used to use massive data to find out the laws that affect power quality, summarize the laws between power quality index data and geographical environment and weather, and thus evaluate the power quality.

[0011] The embodiments of the present invention can achieve the following beneficial effects:

[0012] 1. Considering the different geographical environments of various highway blocks and the close relationship between weather factors and power quality indicators, these two influencing factors should be considered when conducting power quality warning, so as to more accurately predict the future trend of highway power quality indicators;

[0013] 2. By deploying monitoring data collection modules, power quality prediction modules and early warning modules in each block of the highway, monitoring data collection, power quality prediction and early warning threshold setting are carried out separately for each block, thus realizing differentiated power quality early warning;

[0014] 3. The warning threshold and national standard threshold formulated according to actual conditions constitute a "double standard" to ensure the power quality of highways in a more flexible and practical way;

[0015] 4. Through the power quality early warning module, real-time alarm and early warning are realized, which is conducive to timely taking reasonable solutions, quickly and effectively managing and improving power quality problems, so as to reduce power accidents caused by power quality problems;

[0016] 5. Through the power quality assessment module, the inherent characteristics and laws that affect power quality are analyzed, and the connection between power quality and geographical environment and weather is found, so as to further improve the accuracy of the prediction model;

[0017] 6. Through the wireless communication network and cloud data storage module, cloud storage of power quality monitoring data, prediction data and warning data is realized. Through the cloud power quality display module and wireless communication network terminal, the cloud data storage module can be accessed at any time to view and analyze the power quality situation and improve the efficiency of handling power quality problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a structural schematic diagram of a highway power quality early warning system provided by an embodiment of the present invention;

[0020] Figure 2 It is a structural schematic diagram of another highway power quality early warning system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described clearly and completely below. 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 belong to the scope of protection of the present invention.

[0022] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] An embodiment of the present invention provides a highway power quality early warning system. In order to illustrate the system, the challenges mentioned in the background technology are first analyzed in detail. As described in the background, the current online power quality monitoring technology is becoming increasingly mature. The power quality of each monitoring point can be judged by the power quality index data provided by the monitoring system, but the power quality in the future time period cannot be known. Therefore, it is necessary to make scientific predictions on the changing trends of various power quality indicators, so as to fully understand the power quality of each monitoring point, provide a reliable basis and guarantee for making correct decisions on power quality management, and thus improve the safety, reliability and economy of power grid operation.

[0025] In addition, the indicators of power quality are very rich, and each indicator is closely related to the local geographical location, economic level, climate, power grid structure, power load composition and its characteristics. However, the traditional power quality early warning system mostly relies on historical data for prediction when predicting power quality indicators, ignoring the influence of these factors, resulting in reduced accuracy of the prediction model. The geographical environment of different sections of highways is diverse, and they may be built in suburban areas, rural areas, mountainous areas, etc. In addition, the formulation of power quality early warning thresholds should not only be set according to the national standards for power quality, but also be differentiated according to different levels of early warning objects, because different regions have different requirements for power quality, such as tunnels and accident-prone areas have higher requirements for power quality, so they should be set according to actual conditions. In summary, considering the geographical environment and weather factors, the future trend of highway power quality indicators can be predicted more accurately, and the power quality of highways can be guaranteed more flexibly and in line with practical applications. Therefore, it is necessary for the embodiment of the present invention to propose a highway power quality monitoring and early warning system that considers weather factors and geographical location.

[0026] Figure 1 and Figure 2 They are schematic diagrams of the structure of a highway power quality early warning system provided by an embodiment of the present invention. Figure 1 and Figure 2 ,The system includes a monitoring data acquisition module, a data cleaning module, a power quality prediction module and a power quality warning module deployed in ,each block of the highway, and a power quality assessment module (not shown in the figure).

[0027] Specifically, the geographical environment of different blocks of highways is diverse, and the surrounding environment may be different, such as urban areas, mountains, plains, etc. At the same time, the internal environment of highways in different blocks may also be different, such as service areas, tunnels, toll stations, etc. The surrounding environment and internal environment of each block have an impact on the electromechanical equipment used, and the requirements for power quality are also different. Therefore, when predicting power quality, we cannot rely solely on historical data, but also need to classify and divide the surrounding scenes (including the surrounding environment and the internal environment) to improve the accuracy of the early warning model. In addition, weather is also a factor closely related to power quality indicators. Therefore, this embodiment also takes weather data into consideration, and independently performs monitoring data collection, data cleaning, power quality prediction and early warning threshold setting for each block.

[0028] The monitoring data collection units deployed in each block of the highway include a block geographic environment query unit, a block weather data collection unit and a block power quality index collection unit. The block geographic environment query unit is used to query the geographic environment of the current block, the block weather data collection unit is used to collect weather data of the current block, and the block power quality index collection unit is used to collect power quality index data of the current block.

[0029] Optionally, each block weather data collection unit is arranged along the highway of each block, and each block weather data collection unit includes a seven-element sensor of the Vientiane environment and / or a meteorological monitoring station. The seven-element sensor of the Vientiane environment is used to detect at least one of the temperature, light, humidity, air pressure, wind speed, wind direction and rainfall of the current block, and the meteorological monitoring platform is used to provide weather data of the current block for a period of time in the future.

[0030] Optionally, the block power quality index collection unit adopts Ankerui APM83 power quality detection equipment (i.e. Figure 2 The power quality indicator data collected may be at least one of harmonic current, harmonic distortion rate THD, three-phase voltage deviation UD, frequency deviation FD, three-phase voltage unbalance UNU, voltage flicker FV, or other power quality indicator data.

[0031] The data cleaning module deployed in each block of the highway is used to clean abnormal data, duplicate data and missing data collected by the monitoring data collection module of the same block. Optionally, for any type of data collected, the above data cleaning process may include the following steps: using a probability statistics-based method to detect attribute value errors, and setting the erroneous attribute values ​​to null, where the attribute values ​​are abnormal values ​​and missing values; using the neighboring data average method to clean attribute value errors; using the sorting neighbor algorithm to determine whether the data is repeated, and after finding duplicate data, retaining the first duplicate data, and directly merging and deleting the remaining data.

[0032] The power quality prediction module deployed in each block of the highway includes a power quality prediction unit and a power quality warning threshold formulation unit. Among them, the power quality prediction unit is used to predict the future power quality index data of the current block according to the geographical environment of the current block, as well as the weather data and historical power quality index data after cleaning. Of course, the power quality prediction unit can also predict the future power quality index data of the current block only based on the historical power quality index data after cleaning of the current block, which can also reflect the difference in electricity consumption of each block. The power quality warning threshold formulation unit is used to formulate the warning threshold of the current block according to the historical power quality index data after cleaning of the current block. The power quality index data of different blocks are different, and the warning threshold is also different, which realizes the formulation of differentiated thresholds. Optionally, in the process of formulating differentiated thresholds, the relationship between geographical location and climate and each indicator can be comprehensively considered, and the historical power quality index data of the current block after being cleared can be processed by fuzzy clustering algorithm, and a dynamic clustering diagram can be constructed to give the index thresholds of different categories of warning objects. At the same time, a double standard is formed through the national standard threshold to formulate the warning level. .

[0033] The power quality early warning module deployed in each block of the highway includes a monitoring data real-time alarm unit and a prediction data early warning unit. Among them, the monitoring data real-time alarm unit is used to give a real-time alarm for the real-time power quality index data monitored by the current block, and the prediction data early warning unit is used to give an early warning for the future power quality index data predicted by the current block. After the power quality threshold setting unit of the current block sets a reasonable threshold for the block, the threshold is transmitted to the monitoring data real-time alarm unit and the prediction data early warning unit; the monitoring data real-time alarm unit compares the actual power quality index data monitored by the current block with the threshold, and if it does not meet the threshold standard, a real-time alarm is issued; the early warning unit compares the future power quality index data predicted by the current block with the threshold, and if it does not meet the threshold standard, an early warning is issued. Through real-time alarm and early warning, reasonable solutions can be taken in time to quickly and effectively manage and improve power quality problems and reduce power accidents caused by power quality problems.

[0034] The power quality evaluation module is used to use the massive data composed of each block to find out the laws that affect the power quality, summarize the laws between the power quality index data and the geographical environment and weather, and thus evaluate the power quality. Optionally, the power quality index data can be analyzed and evaluated first to find out the unqualified power quality index data; then the Apriori association rule and FP-Tree algorithm are used to mine the association rules of the unqualified power quality index data, find out the inherent characteristics and laws hidden in the data that affect the power quality, summarize the laws between the power quality index data and the geographical environment and weather, and thus evaluate the power quality. Optionally, the above-mentioned unqualified power quality index data can also come from the power quality early warning module of each block, and the data that does not meet the threshold standard is the unqualified power quality index data. It should be noted that the power quality evaluation module analyzes and evaluates the data of all blocks, and this embodiment does not specifically limit its deployment location, but the power quality evaluation module is for the entire highway, not each block deploys a power quality evaluation module separately. Optionally, the power quality assessment module can be deployed in the cloud.

[0035] Optionally, the system may also include wireless transmission modules for each block of the highway, and a data storage module deployed in the cloud. The data cleaned by the data cleaning module of each block, the future power quality index data and warning threshold of each block obtained by the power quality prediction module, and the real-time alarm and early warning data of the power quality warning module are stored in the data storage module via the wireless transmission module of the same block. Optionally, the data storage module may be in a cloud server to realize cloud storage of various data, and accessing the cloud server can realize data reading anytime and anywhere.

[0036] Optionally, the system may further include a power quality display module in the cloud, and the data in the data storage module can be displayed in the power quality display module. In a specific embodiment, the power quality display module includes an LCD display screen, an LCD display control unit, a timing control unit, and a power quality problem display unit; wherein the LCD display screen is used to display the data in the data storage module, the LCD display control unit is used to control the LCD display screen, the timing control unit is used to control the display duration, and the power quality problem display unit is used to separately display the data of the highway block with problems.

[0037] Optionally, the system may further include multiple wireless communication network terminals, each of which may be a PC segment, a mobile client, etc. Each wireless communication network terminal accesses the data storage module in the cloud wirelessly, so that the data stored in the data storage module is displayed on the wireless communication network terminal.

[0038] In addition, the geographic environment query unit can also be replaced by a geographic environment acquisition unit. The geographic environment acquisition unit collects the geographic environment around and inside each block of the highway through remote sensing or shooting technology, and the collected data is transmitted to the data storage module in the cloud through the wireless transmission module of the same block. When the power quality display module in the cloud or each wireless communication network terminal displays the relevant data of the block, the geographic environment data of the block can be displayed together as background information.

[0039] In summary, the embodiment of the present invention provides a highway power quality early warning system, which can achieve the following beneficial effects:

[0040] 1. Considering the different geographical environments of various highway blocks and the close relationship between weather factors and power quality indicators, these two influencing factors should be considered when conducting power quality warning, so as to more accurately predict the future trend of highway power quality indicators;

[0041] 2. By deploying monitoring data collection modules, power quality prediction modules and early warning modules in each block of the highway, monitoring data collection, power quality prediction and early warning threshold setting are carried out separately for each block, thus realizing differentiated power quality early warning;

[0042] 3. The warning threshold and national standard threshold formulated according to actual conditions constitute a "double standard" to ensure the power quality of highways in a more flexible and practical way;

[0043] 4. Through the power quality early warning module, real-time alarm and early warning are realized, which is conducive to timely taking reasonable solutions, quickly and effectively managing and improving power quality problems, so as to reduce power accidents caused by power quality problems;

[0044] 5. Through the power quality assessment module, the inherent characteristics and laws that affect power quality are analyzed, and the connection between power quality and geographical environment and weather is found, so as to further improve the accuracy of the prediction model;

[0045] 6. Through the wireless communication network and cloud data storage module, cloud storage of power quality monitoring data, prediction data and warning data is realized. Through the cloud power quality display module and wireless communication network terminal, the cloud data storage module can be accessed at any time to view and analyze the power quality situation and improve the efficiency of handling power quality problems.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present invention.

Claims

1. A highway power quality early warning system, characterized in that: include: The monitoring data collection module of each block of the expressway, each monitoring data collection unit includes a block geographic environment query unit, a block weather data collection unit and a block power quality index collection unit, wherein the block geographic environment query unit is used to query the geographic environment of the current block, the block weather data collection unit is used to collect weather data of the current block, and the block power quality index collection unit is used to collect power quality index data of the current block; The data cleaning module of each block of the highway is used to clean the data collected by the monitoring data collection module of the same block for abnormal data, duplicate data and missing data; The power quality prediction module of each block of the highway includes a power quality prediction unit and a power quality warning threshold setting unit; wherein the power quality prediction unit is used to predict the future power quality index data of the current block according to the geographical environment of the current block, as well as the cleaned weather data and historical power quality index data; the power quality warning threshold setting unit is used to set the warning threshold of the current block according to the cleaned historical power quality index data of the current block; The power quality early warning module of each block of the expressway includes a monitoring data real-time alarm unit and a prediction data early warning unit; wherein the monitoring data real-time alarm unit is used to issue a real-time alarm for the real-time power quality index data monitored by the current block according to the early warning threshold of the current block; the prediction data early warning unit is used to issue an early warning for the future power quality index data predicted by the current block according to the early warning threshold of the current block; The power quality assessment module is used to use massive data to find out the laws that affect power quality, summarize the laws between power quality index data and geographical environment and weather, and thus evaluate the power quality.

2. The system according to claim 1, characterized in that The weather data collection unit of each block includes a high-performance microprocessor, an external sensor, a collector, a signal output interface, a wind-solar complementary energy supply system and a meteorological monitoring platform. The external sensor is used to detect the temperature, humidity, air pressure, wind speed, wind direction and rainfall of the current block, and the meteorological monitoring platform is used to predict weather data for a period of time in the future.

3. The system according to claim 1, characterized in that The block power quality index collection unit adopts an integrated power quality detection device, or a plurality of electronic transformers; The collected data include harmonic distortion rate THD, three-phase voltage deviation UD, frequency deviation FD, three-phase voltage unbalance UNU and voltage flicker FV.

4. According to the system of claim 1, the data cleaning module of each block cleans the data collected by the monitoring data collection module of the same block from abnormal data, duplicate data and missing data by the following method: For any type of data collected, a probability-based statistical method is used to detect attribute value errors, and the erroneous attribute values ​​are blanked out. The attribute values ​​are abnormal values ​​and missing values. Use the neighboring data average method to clean attribute value errors; The sorting neighbor algorithm is used to determine whether the data is repeated. After duplicate data is found, the first duplicate data is retained and the remaining data is directly merged and deleted.

5. The system according to claim 1, characterized in that The power quality warning threshold setting unit sets the warning threshold of the current block according to the historical power quality index data after cleaning of the current block in the following manner: Taking into account the relationship between geographical location and climate and various indicators, the fuzzy clustering algorithm is used to process the historical power quality indicator data after the current block is clarified, and a dynamic clustering diagram is constructed to give the indicator thresholds of different categories of warning objects. At the same time, a double standard is formed through the national standard threshold to formulate the warning level.

6. The system according to claim 1, characterized in that It also includes wireless transmission modules for each section of the highway, as well as data storage modules and power quality display modules in the cloud; The data cleaned by each data cleaning module, the future power quality index data and warning threshold of each block obtained by each power quality prediction module, and the real-time alarm data and early warning data of each power quality warning module are stored in the data storage module via the wireless transmission module of the same block; The data of the data storage module is displayed in the power quality display module.

7. The system according to claim 6, characterized in that The power quality display module includes an LCD display screen, an LCD display control unit, a timing control unit, and a power quality problem display unit; Among them, the LCD display screen is used to display the data in the data storage module, the LCD display control unit is used to control the LCD display screen, the timing control unit is used to control the display duration, and the power quality problem display unit is used to separately display the data of the problematic highway block.

8. The system according to claim 6, characterized in that Also includes: A wireless communication network terminal accesses a data storage module in the cloud in a wireless manner, so that the data stored in the data storage module is displayed on the wireless communication network terminal.

9. The system according to claim 6 or 8, characterized in that: The geographical environment of each block queried by each geographical environment query unit is transmitted to the cloud data storage module through the wireless transmission module of the same block, and then displayed on the power quality display module and the wireless communication network terminal as the geographical environment background.

10. The system according to claim 1, characterized in that The power quality assessment module uses massive data to find out the laws that affect power quality, summarizes the laws between power quality index data and geographical environment and weather, and thus assesses power quality: Analyze and evaluate the power quality index data to find out the unqualified power quality index data; By using Apriori association rules and FP-Tree algorithm, the unqualified power quality index data is mined for association rules, the inherent characteristics and laws hidden in the data that affect the power quality are found, and the laws between the power quality index data and the geographical environment and weather are summarized, so as to evaluate the power quality.

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