An intelligent control system for a substation based on real-time monitoring

Abstract

The present invention relates to the technical field of substations, and particularly to an intelligent control system for substations based on real-time monitoring. The system includes a data monitoring module, a communication module, a data processing module, and a control module. The present invention collects output voltage signals in real time, monitors the changes in the output voltage signals in real time through a differential tracker, and analyzes the current voltage state. Due to the influence of bad weather, the substation monitoring signals will become unstable and inaccurate. Therefore, it is necessary to accurately analyze the reliability of the monitoring signals, that is, by analyzing the influence of external factors on the current power grid environment in real time, and by combining the monitoring results of substation equipment, that is, to determine whether the determination result of interference in the current power grid environment based on the voltage signal characteristics is accurate. Moreover, by combining vibration characteristics, it is verified whether the monitoring of the voltage signal is accurate, so as to form a closed-loop to determine whether the monitoring of the substation is accurate, improving the safety and reliability of the substation.

Description

Technical Field

[0001] The present invention relates to the technical field of substations, and in particular to an intelligent control system for substations based on real-time monitoring. Background Art

[0002] A substation can monitor and control the operating status of a power system in real time, and can cooperate with other power facilities (such as power plants, distribution networks, etc.) to optimize the distribution and use of electric power. Such coordinated regulation helps to balance the grid load, avoid overload and power waste. The substation is equipped with advanced monitoring and analysis tools, which can perform real-time analysis on the operating status of equipment to help operation and maintenance personnel promptly discover potential problems, perform preventive maintenance, and reduce the probability of failures. How to ensure the safe and efficient operation of substation equipment through more efficient monitoring technologies, data analysis methods and fault diagnosis methods has increasingly become a topic of concern for workers in related research fields.

[0003] Chinese patent document with the authorization announcement number CN112902916B discloses an intelligent monitoring system for substations, which includes a concrete mounting base. An installation cabinet is installed in the concrete mounting base. Slide rails are respectively arranged on the left and right inner walls of the installation cabinet in the up and down directions. A connecting plate is slidably connected to the slide rails. A substation cabinet is arranged at the upper end of the connecting plate. An infrared receiver corresponding to an infrared emitter for detection is arranged on one side of the substation cabinet. The infrared receiver is signal-connected to a controller. A first rack slidably connected to the slide rails is arranged at the lower end of the connecting plate. The first rack is driven by a driving mechanism. The driving mechanism includes a first motor and a first bevel gear arranged on the output shaft of the first motor and meshing with a second bevel gear. The second bevel gear is provided with a rotating shaft, and a third gear meshing with the first rack is arranged on the rotating shaft. It can be seen that due to the lack of real-time monitoring of the output voltage of the substation in the existing intelligent control system for substations, abnormal voltage conditions cannot be detected in time, resulting in poor abnormal detection effect and low accuracy. Summary of the Invention

[0004] Therefore, the present invention provides an intelligent control system for substations based on real-time monitoring to overcome the problem of low accuracy of real-time monitoring caused by the lack of correlation analysis of voltage signals and vibration signals of substation equipment in the prior art.

[0005] To achieve the above object, the present invention provides an intelligent control system for substations based on real-time monitoring, including

[0006] a data monitoring module that monitors the operating data of substation equipment in real time in the established digital substation, and the operating data includes an original voltage signal and a real-time vibration feature;

[0007] A communication module, which is connected to the data monitoring module and uses a wireless or wired network to transmit the collected operation data to the control module and the data processing module, and send the corresponding warning prompt level to the external management terminal;

[0008] The data processing module, which is connected to the communication module, is used to analyze the received original voltage signal to obtain a real-time voltage signal and the corresponding difference points;

[0009] The control module, which is respectively connected to the data monitoring module, the communication module and the data processing module, is used to analyze the voltage signal amplitude of the difference points, verify the current voltage abnormality according to the analysis result and generate a corresponding voltage abnormality indication instruction, or combine the real-time vibration characteristics to analyze the voltage abnormality according to the real-time vibration characteristics to determine the corresponding warning prompt level.

[0010] Further, the data processing module includes an interference identification unit and a signal identification unit, wherein,

[0011] The interference identification unit is used to analyze the influencing factors of substation equipment to identify the current interference situation of the influencing factors on the original voltage signal, and the current interference situation includes a first interference situation and a second interference situation;

[0012] The signal identification unit is used to perform noise reduction processing on the original voltage signal according to the current interference situation, and identify the original voltage signal after the noise reduction processing to obtain a real-time voltage signal and the corresponding difference points.

[0013] Further, the control module includes a first feature analysis unit, a second feature analysis unit, a voltage anomaly disturbance detection unit and a warning unit, wherein,

[0014] The first feature analysis unit is used to analyze the feature signals of the difference points in the first interference situation to obtain a first verification result and a second verification result, and the feature signals include voltage signal amplitude and signal duration;

[0015] The second feature analysis unit is used to obtain the real-time vibration characteristics of the substation equipment in the first verification result or the second interference situation, and analyze the current voltage state according to the real-time vibration characteristics. The real-time vibration characteristics include real-time vibration displacement, real-time vibration frequency, real-time vibration amplitude and real-time vibration amplitude change rate;

[0016] The voltage anomaly disturbance detection unit is used to obtain the voltage signal amplitude and signal duration corresponding to the difference points under the first verification result, compare the duration threshold with the signal duration, and compare the voltage signal amplitude with the standard amplitude range, and analyze the voltage anomaly situation corresponding to the difference points according to the comparison results;

[0017] The warning unit is used to send corresponding early warning prompts and voltage anomaly situation indications to the management end according to the analysis results.

[0018] Further, the first feature analysis unit includes a voltage signal acquisition sub-unit and a determination sub-unit, where,

[0019] The voltage signal acquisition sub-unit is used to obtain the voltage signal amplitude of each difference point within a preset monitoring duration under the first interference condition;

[0020] The determination sub-unit is used to determine the voltage signal amplitude according to the standard amplitude range, and obtain the first verification result and the second verification result based on the determination result;

[0021] Among them, the first verification result is that the voltage anomaly disturbance detection is inaccurate, and the second verification result is that the voltage anomaly disturbance detection is accurate.

[0022] Further, the second feature analysis unit includes a vibration signal acquisition unit, a second determination sub-unit, and a third determination sub-unit, where,

[0023] The vibration signal acquisition unit is used to obtain the real-time vibration characteristics of the substation equipment under the first verification result or the second interference condition;

[0024] The second determination sub-unit is used to perform vibration displacement determination on the real-time vibration displacement according to the standard displacement range, and determine the current voltage state based on the vibration displacement determination result;

[0025] The third determination sub-unit is used to generate corresponding early warning prompt level instructions based on the vibration displacement determination result, or in combination with the determination results of the real-time vibration frequency, real-time vibration amplitude, and real-time vibration amplitude change rate.

[0026] Further, when the third determination sub-unit determines that the real-time vibration displacement does not fall within the standard displacement range, it obtains the real-time vibration frequency, analyzes the real-time vibration frequency according to the first standard frequency and the second standard frequency, and when the real-time vibration frequency is between the first standard frequency and the second standard frequency, marks the corresponding monitoring point as a vibration mutation point, obtains the real-time vibration amplitude corresponding to the vibration mutation point for analysis, and selects and generates a secondary early warning prompt indication or a tertiary early warning prompt indication according to the analysis results.

[0027] Further, the voltage anomaly disturbance detection unit compares the duration threshold with the signal duration,

[0028] If the signal duration is less than the duration threshold, it compares the voltage signal amplitude with the standard amplitude range, and determines the corresponding voltage anomaly as a voltage sag or a voltage swell based on the comparison result;

[0029] If the signal duration is greater than or equal to the duration threshold, it determines that the voltage anomaly corresponding to the difference point is a voltage interruption;

[0030] Among them, if the voltage signal amplitude is less than the minimum value of the standard amplitude range, it determines that the voltage anomaly corresponding to the difference point is a voltage sag;

[0031] If the voltage signal amplitude is greater than the maximum value of the standard amplitude range, it determines that the voltage anomaly corresponding to the difference point is a voltage swell.

[0032] Further, the signal recognition unit includes a noise reduction processing sub-unit and a difference point recognition sub-unit, where

[0033] The noise reduction processing sub-unit is used to perform noise reduction processing on the original voltage signal under the first interference condition to form a real-time voltage signal;

[0034] The difference point recognition sub-unit is used to calculate the relative difference rate between the maximum value and the average value of the high-frequency coefficient modulus, compare the standard difference rate with the relative difference rate, and obtain the difference point based on the comparison result;

[0035] Among them, the relative difference rate is the proportion of the part where the maximum value exceeds the average value in the average value.

[0036] Further, the process of the noise reduction processing sub-unit to achieve noise reduction processing is to perform wavelet transform on the original voltage signal, decompose the signal into components of different frequencies for threshold processing, and perform inverse wavelet transform on the coefficients after threshold processing to reconstruct the noise-reduced signal to form a real-time voltage signal.

[0037] Further, the interference recognition unit includes an environment monitoring sub-unit, a vibration state monitoring sub-unit, a fault state monitoring sub-unit, and a load monitoring sub-unit, where

[0038] The environment monitoring sub-unit, which is connected to an external management platform, is used to obtain current weather data and determine the current interference environment as the first interference condition when the current weather is abnormal;

[0039] The fault monitoring sub-unit is used to obtain the fault state of the substation equipment and determine the current interference environment as the first interference condition when the substation equipment is in a fault state;

[0040] The load monitoring subunit is used to monitor the change rate of the load in real time to determine the current interference situation;

[0041] The vibration state monitoring subunit is used to obtain the real-time vibration displacement of the substation equipment and analyze the vibration situation of the substation equipment based on the real-time vibration displacement.

[0042] Compared with the prior art, the beneficial effects of the present invention are as follows: by using a differential tracker to monitor the change of the output voltage signal in real time, analyzing the current voltage state, and monitoring the mechanical vibration state, fault situation, load fluctuation situation and external environment of the substation equipment to identify the noise interference situation of the equipment influencing factors on the output voltage signal, and verifying the identification accuracy of the abnormal points in the voltage signal, and correlating the vibration characteristics of the substation equipment to accurately identify power anomalies, generate multi-level warning prompts, improve the real-time performance of monitoring the operation state of the monitoring equipment, and improve the safety, reliability and operation efficiency of the substation through comprehensive monitoring, intelligent analysis and visual display, ensuring the stable operation of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic structural diagram of the intelligent control system for a substation based on real-time monitoring according to an embodiment of the present invention;

[0044] Figure 2 It is a schematic connection diagram of the data processing module according to an embodiment of the present invention;

[0045] Figure 3 It is a schematic connection diagram of the control module according to an embodiment of the present invention;

[0046] Figure 4 It is a schematic connection diagram of the first feature analysis unit according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0047] In order to make the objectives and advantages of the present invention clearer and more understandable, the present invention will be further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0048] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and do not limit the protection scope of the present invention.

[0049] It should be noted that in the description of the present invention, the terms indicating the direction or positional relationship such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0050] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and defined, the terms "installation", "connection", and "connection" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0051] Please refer to Figure 1 as shown in the figure, which is a schematic structural diagram of the substation intelligent control system based on real-time monitoring according to the embodiment of the present invention. The present invention provides a substation intelligent control system based on real-time monitoring, including

[0052] a data monitoring module for real-time monitoring of the operation data of substation equipment in the established digital substation, where the operation data includes the original voltage signal and the real-time vibration characteristics;

[0053] a communication module connected to the data monitoring module, which uses a wireless or wired network to transmit the collected operation data to the control module and the data processing module, and send the corresponding warning prompt level to the external management terminal;

[0054] the data processing module, connected to the communication module, for analyzing the received original voltage signal to obtain the real-time voltage signal and the corresponding difference points;

[0055] the control module, respectively connected to the data monitoring module, the communication module, and the data processing module, for analyzing the voltage signal amplitude of the difference points, verifying the current voltage abnormality according to the analysis result and generating a corresponding voltage abnormality indication instruction, or combining the real-time vibration characteristics to analyze the voltage abnormality according to the real-time vibration characteristics to determine the warning prompt level of the voltage abnormal fluctuation.

[0056] In this embodiment, a visual digital substation is established through digital twin technology to achieve real-time monitoring of the equipment status of the substation. The visualization is divided into substation environment visualization, asset configuration visualization, and substation cabinet visualization. Substation environment visualization means restoring the layout of facilities such as the actual substation cabinet location, power distribution equipment, and transmission equipment to the three-dimensional model scene of the virtual computer room, and sending out early warning signals in a timely manner by monitoring the operation of the equipment. Asset configuration visualization display means importing the basic information of substation equipment into the visual monitoring system through three-dimensional modeling, and the corresponding equipment configuration information can be viewed. The improvement of the information management file can be completed through the historical query record. Substation cabinet visualization means displaying the U positions of the substation cabinets on the platform, distinguishing the cabinet functions by colors, and describing the cabinet status through bar charts. The equipment operation information can be intuitively monitored through the interface display, and the operation status of the substation equipment can be obtained through the statistics of two-dimensional charts, and the operation data and fault data can be obtained in a timely manner. Alarm prompts can be sent to the management end in a timely manner to find equipment problems and solve the alarm situation in a timely manner. The differential tracker is connected to the voltage sensor and installed near key electrical equipment in the substation, such as transformers and switchgear, so as to collect the output voltage signal in real time, monitor the change of the output voltage signal in real time through the differential tracker, and analyze the current voltage state. By monitoring the mechanical vibration state, fault condition, load fluctuation condition and external environment of the substation equipment, the noise interference of the equipment influencing factors on the output voltage signal is identified, and the recognition accuracy of the abnormal points in the voltage signal is verified, and the vibration characteristics of the substation equipment are associated to accurately identify the power abnormality, generate multi-level early warning prompts, improve the real-time performance of monitoring the operation state of the equipment, and improve the safety, reliability and operation efficiency of the substation through comprehensive monitoring, intelligent analysis and visual display, ensuring the stable operation of the power system.

[0057] Due to the influence of bad weather, the substation monitoring signal will become unstable and inaccurate. Therefore, it is particularly important to accurately analyze the reliability of the monitoring signal, that is, by analyzing the influence of external factors on the current power grid environment in real time, and by combining the monitoring results of the substation equipment, that is, to analyze whether the determination result of the interference in the current power grid environment based on the voltage signal characteristics is accurate, and moreover, by combining the vibration characteristics to verify whether the monitoring of the voltage signal is accurate, so as to form a closed-loop determination of whether the substation monitoring is accurate.

[0058] Specifically, the signal recognition unit includes a noise reduction processing subunit and a difference point recognition subunit, where

[0059] The noise reduction processing subunit is used to perform noise reduction processing on the original voltage signal under the first interference condition to form a real-time voltage signal;

[0060] The process of the noise reduction processing is to decompose the original voltage signal into components of different frequencies through wavelet transform for threshold processing, and then perform inverse wavelet transform on the coefficients after threshold processing to reconstruct the noise-reduced signal, thereby forming a real-time voltage signal.

[0061] The difference point identification subunit is used to calculate the relative difference rate between the maximum value and the average value of the modulus of the high-frequency coefficients, compare the standard difference rate with the relative difference rate, and obtain the difference points based on the comparison result.

[0062] Among them, the relative difference rate is the proportion of the part by which the maximum value exceeds the average value in the average value.

[0063] In this embodiment, the noise reduction processing subunit decomposes the original voltage signal into components of different frequencies through wavelet transform. The wavelet basis Daubechies wavelet or Symlets wavelet can be selected for wavelet transform. After wavelet transform, the obtained high-frequency coefficients contain noise. By setting a threshold, these high-frequency coefficients are processed. Subtract the threshold from the absolute value of the high-frequency coefficient. If the result is negative, set it to zero, otherwise keep the original value. The Mallat algorithm is used to quickly calculate the wavelet transform and inverse transform to reconstruct the processed signal into the original signal. The difference point identification subunit completes the detection of abnormal points for the filtered voltage signal through the wavelet transform modulus maximum method. First, calculate the maximum value and the average value of the modulus of the first-layer high-frequency coefficients of the voltage signal, and then calculate the relative difference rate. The relative difference rate = (maximum value - average value) / average value. Set the standard difference rate. If the relative difference rate is greater than the standard difference rate, it is detected as an abnormal point. The standard difference rate is set to 0.5. For example, when the maximum value is 10.0 and the average value is 5.0, the calculated relative difference rate is 1.0. Since the relative difference rate is greater than 0.5, the signal is marked as a difference point.

[0064] Refer to Figure 2 as shown, which is a connection schematic diagram of the data processing module according to an embodiment of the present invention;

[0065] Specifically, the data processing module includes an interference identification unit and a signal identification unit, where

[0066] the interference identification unit is used to analyze the influencing factors of the substation equipment to identify the current interference situation of the influencing factors on the original voltage signal. The current interference situation includes a first interference situation and a second interference situation;

[0067] the signal identification unit is used to perform noise reduction processing on the original voltage signal according to the current interference situation, and identify the original voltage signal after noise reduction processing to obtain a real-time voltage signal and corresponding difference points.

[0068] Refer toFigure 3 As shown, it is a connection schematic diagram of the control module according to an embodiment of the present invention;

[0069] Specifically, the control module includes a first feature analysis unit, a second feature analysis unit, a voltage abnormal disturbance detection unit, and a warning unit. Among them,

[0070] The first feature analysis unit is used to analyze the feature signals of the difference points in the first interference situation to obtain a first verification result and a second verification result. The feature signals include the voltage signal amplitude and the signal duration;

[0071] The second feature analysis unit is used to obtain the real-time vibration characteristics of the substation equipment in the first verification result or the second interference situation, and analyze the current voltage state according to the real-time vibration characteristics. The real-time vibration characteristics include real-time vibration displacement, real-time vibration frequency, real-time vibration amplitude, and real-time vibration amplitude change rate;

[0072] The voltage abnormal disturbance detection unit is used to obtain the voltage signal amplitude and signal duration corresponding to the difference points in the first verification result, compare the duration threshold with the signal duration, and compare the voltage signal amplitude with the standard amplitude interval, and analyze the voltage abnormal situation corresponding to the difference points according to the comparison result;

[0073] The warning unit is used to send corresponding early warning prompts and voltage abnormal situation indications to the management end according to the analysis results;

[0074] The voltage abnormal situation indications include voltage interruption, voltage swell, and voltage sag.

[0075] Specifically, the voltage abnormal disturbance detection unit compares the duration threshold with the signal duration,

[0076] If the signal duration is less than the duration threshold, the voltage signal amplitude is compared with the standard amplitude interval, and the corresponding voltage abnormal situation is determined to be voltage sag or voltage swell based on the comparison result;

[0077] If the signal duration is greater than or equal to the duration threshold, it is determined that the voltage abnormal situation corresponding to the difference point is voltage interruption;

[0078] Among them, if the voltage signal amplitude is less than the minimum value of the standard amplitude interval, it is determined that the voltage abnormal situation corresponding to the difference point is voltage sag;

[0079] If the voltage signal amplitude is greater than the maximum value of the standard amplitude interval, it is determined that the voltage abnormal situation corresponding to the difference point is voltage swell.

[0080] Refer to Figure 4As shown, it is a connection schematic diagram of the first feature analysis unit of the embodiment of the present invention;

[0081] Specifically, the first feature analysis unit includes a voltage signal acquisition sub-unit and a determination sub-unit. Among them,

[0082] The voltage signal acquisition sub-unit is used to acquire the voltage signal amplitudes of each difference point within a preset monitoring duration under the first interference condition;

[0083] The determination sub-unit is used to determine the voltage signal amplitude according to the standard amplitude interval, and obtain a first verification result and a second verification result based on the determination result;

[0084] Among them, the first verification result is that the detection of voltage abnormal disturbance is inaccurate, and the second verification result is that the detection of voltage abnormal disturbance is accurate;

[0085] When the voltage signal amplitudes are all within the standard amplitude interval, it is determined that the detection of voltage abnormal disturbance is inaccurate;

[0086] When there is a voltage signal amplitude not within the standard amplitude interval, it is determined that the detection of voltage abnormal disturbance is accurate;

[0087] In the first interference condition in this embodiment, it means that the interference identification unit monitors in real time that there is interference in the current power grid environment, and the second interference condition means that the interference identification unit does not monitor that there is interference in the current power grid environment; the existence of interference in the current power grid environment includes high load, equipment failure or heavy rain weather; by associating the monitoring results of the substation equipment by the interference identification unit, to verify whether the first feature analysis unit of the control module obtains the voltage abnormal state accurately by monitoring and identifying the characteristics of the voltage signal. For example, when the environmental monitoring sub-unit in the interference identification unit monitors that the current weather data corresponds to a period of strong wind and heavy rain, at this time, it will cause abnormal fluctuations in the voltage signal, that is, there is a voltage signal amplitude not within the standard amplitude interval. Then, at this time, the second verification result will be obtained, indicating that the detection of voltage abnormal disturbance is accurate. On the contrary, it means that the detection of voltage abnormal disturbance is inaccurate, and it is necessary to associate the vibration signal characteristics of the substation equipment to indirectly analyze the voltage state, so as to identify the voltage abnormal situation in time and perform hierarchical early warning. The hierarchical early warning prompt indicates the level of voltage fluctuation abnormality. The higher the level, the more obvious the voltage abnormal fluctuation. The hierarchical early warning includes a first-level early warning prompt indication, a second-level early warning prompt indication, and a third-level early warning prompt indication.

[0088] The standard amplitude interval in this embodiment represents the set threshold of the voltage amplitude, which is set between 198V - 38.5kV, and the set value is related to the type and operating conditions of the equipment. In this embodiment, it is set to 900V - 1100V.

[0089] Specifically, the second feature analysis unit includes a vibration signal acquisition unit, a second determination subunit, and a third determination subunit, where

[0090] the vibration signal acquisition unit is used to acquire the real-time vibration characteristics of the substation equipment under the second verification result or the second interference condition;

[0091] the second determination subunit is used to perform vibration displacement determination on the real-time vibration displacement according to the standard displacement interval, and determine the current voltage state based on the vibration displacement determination result;

[0092] the third determination subunit is used to generate a corresponding early warning prompt level instruction based on the vibration displacement determination result, or in combination with the determination results of the real-time vibration frequency, the real-time vibration amplitude, and the real-time vibration amplitude change rate.

[0093] If the real-time vibration displacement falls within the standard displacement interval, the third determination subunit determines that the current voltage state is normal;

[0094] If the real-time vibration displacement does not fall within the standard displacement interval, the third determination subunit acquires the real-time vibration frequency, and analyzes the real-time vibration frequency according to the first standard frequency and the second standard frequency.

[0095] If the real-time vibration frequency is less than the first standard frequency, it is determined that the current voltage state is normal, and no early warning prompt indication is given;

[0096] If the real-time vibration frequency is between the first standard frequency and the second standard frequency, the corresponding monitoring point is marked as a vibration mutation point, the real-time vibration amplitude corresponding to the vibration mutation point is acquired for analysis, and a secondary early warning prompt indication or a tertiary early warning prompt indication is selected and generated according to the analysis result;

[0097] If the real-time vibration frequency is greater than the second standard frequency, a tertiary early warning prompt indication is given.

[0098] The standard displacement interval in this embodiment represents the allowable vibration error of substation equipment. The set value is related to the safety requirements, operating environment, and type of the equipment under test. Generally, it is set within the range of 0.01 mm - 0.1 m and is adaptively selected according to the actual equipment type. The set first standard vibration frequency approaches zero and is generally set between 0.01 - 0.02. The second standard vibration frequency represents the vibration frequency limit value, that is, if the actual vibration frequency is higher than the second standard vibration frequency, it is high-frequency vibration, which is generally set between 0.5 - 0.7 and is adaptively selected according to the actual safety requirements and equipment type. The set first standard vibration frequency represents the defined value for normal equipment vibration state, which can be set to 2.3 millimeters per second. The second standard vibration frequency represents the defined value for abnormal equipment vibration state, which can be set to 10.1 millimeters per second. The set standard vibration amplitude is 2.8 millimeters per second, and the set value can also be adaptively adjusted according to the actual safety requirements and equipment type. The set standard vibration amplitude change rate approaches zero and is set to 0.01 millimeters per second.

[0099] Specifically, compare the standard vibration amplitude with the real-time vibration amplitude.

[0100] If the real-time vibration amplitude is less than the standard vibration amplitude, obtain another vibration mutation point after a preset acquisition interval, calculate the real-time vibration amplitude change rate, and determine the real-time vibration amplitude change rate according to the standard vibration amplitude change rate to select and generate a secondary warning prompt indication or a tertiary warning prompt indication.

[0101] If the real-time vibration amplitude is greater than or equal to the standard vibration amplitude, give a tertiary warning prompt indication.

[0102] In this embodiment, the primary warning prompt indication is that the interference degree is relatively low and hardly has a negative impact on the equipment; the secondary warning prompt indication is that the voltage fluctuation trend gradually increases; the tertiary warning prompt indication is that the voltage fluctuation is abnormal; when the real-time vibration amplitude change rate is greater than or equal to the standard vibration amplitude change rate, generate a secondary warning prompt indication, and when the real-time vibration amplitude change rate is less than the standard vibration amplitude change rate, generate a primary warning prompt indication.

[0103] When it is determined that the real-time vibration amplitude change rate is greater than or equal to the standard vibration amplitude change rate, it indicates that the amplitude is small but the amplitude tends to increase. At this time, the equipment operating state is relatively dangerous, the voltage fluctuation trend gradually increases, and it is possible to timely discover progressive faults that are difficult to detect, increasing the timeliness of discovering potential faults.

[0104] Specifically, the interference recognition unit includes an environment monitoring subunit, a vibration state monitoring subunit, a fault state monitoring subunit, and a load monitoring subunit, where

[0105] The environmental monitoring subunit is connected to an external management platform and is used to obtain current weather data. When the current weather is abnormal, it determines that the current interference environment is the first interference situation, and when the current weather is normal, it determines that the current interference environment is the second interference situation;

[0106] The fault monitoring subunit is used to obtain the fault status of substation equipment. When the substation equipment is in a fault state, it determines that the current interference environment is the first interference situation, otherwise, it determines that the current interference environment is the second interference situation;

[0107] The load monitoring subunit is used to monitor the change rate of the load in real time to determine the current interference situation. When the change rate of the load is greater than or equal to the threshold, it determines that the current interference environment is the first interference situation, otherwise, it determines that the current interference environment is the second interference situation.

[0108] In this embodiment, the first interference situation indicates a power grid fluctuation situation with external influence, which will interfere with the original voltage signal. Therefore, it is necessary to perform noise reduction processing on the measured voltage signal to obtain a more accurate difference value. At the same time, in the first interference situation, the detection accuracy of the voltage signal is verified to avoid low detection accuracy of the voltage signal and failure to timely identify abnormal voltage conditions of substation equipment.

[0109] By the interference identification unit, the load, equipment faults and weather conditions are monitored. When the load is too high, equipment fails or there is a rainstorm, it may cause abnormal fluctuations in the voltage signal. Therefore, by detecting the voltage signal in real time, the accuracy of voltage anomaly disturbance detection is verified.

[0110] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0111] The above are only the preferred embodiments of the present invention and are not used to limit the present invention; for those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A substation intelligent control system based on real-time monitoring, characterized in that: include, A data monitoring module monitors the operation data of substation equipment in real time in the established digital substation, wherein the operation data includes original voltage signals and real-time vibration characteristics; A communication module, which is connected to the data monitoring module and uses a wireless or wired network to transmit the collected operation data to the control module and the data processing module, and sends the corresponding warning prompt level to an external management terminal; The data processing module is connected to the communication module and is used to analyze the received original voltage signal to obtain a real-time voltage signal and a corresponding difference point; The data processing module includes an interference identification unit and a signal identification unit, wherein: The interference identification unit is used to analyze the influencing factors of the substation equipment to identify the current interference situation of the influencing factors on the original voltage signal, and the current interference situation includes a first interference situation and a second interference situation; The signal recognition unit is used to perform noise reduction processing on the original voltage signal according to the current interference situation, and to recognize the original voltage signal after the noise reduction processing to obtain the real-time voltage signal and the corresponding difference point; The first interference situation indicates that the interference identification unit detects interference in the current power grid environment in real time, and the second interference situation indicates that the interference identification unit does not detect interference in the current power grid environment; interference in the current power grid environment includes excessive load, equipment failure or heavy rain; The control module is connected to the data monitoring module, the communication module and the data processing module respectively, and is used to analyze the voltage signal amplitude of the difference point, verify the current voltage abnormality according to the analysis result and generate a corresponding voltage abnormality indication instruction, or analyze the voltage abnormality according to the real-time vibration characteristics in combination with the real-time vibration characteristics to determine the corresponding early warning prompt level; The control module includes a first feature analysis unit, a second feature analysis unit, a voltage abnormal disturbance detection unit and a warning unit, wherein: The first characteristic analysis unit is used to analyze the characteristic signal of the difference point under the first interference condition to obtain the first verification result and the second verification result, wherein the characteristic signal includes the voltage signal amplitude and the signal duration; The first characteristic analysis unit includes a voltage signal acquisition subunit and a determination subunit, wherein: The voltage signal acquisition subunit is used to acquire the voltage signal amplitude of each difference point within a preset monitoring time under the first interference condition; The determination subunit is used to determine the voltage signal amplitude according to the standard amplitude range, and obtain a first verification result and a second verification result based on the determination result; Among them, when the voltage signal amplitudes are all within the standard amplitude range, it is determined that the voltage abnormal disturbance detection is inaccurate; when there is a voltage signal amplitude that is not within the standard amplitude range, it is determined that the voltage abnormal disturbance detection is accurate; the first verification result is that the voltage abnormal disturbance detection is inaccurate, and the second verification result is that the voltage abnormal disturbance detection is accurate; The second feature analysis unit is used to obtain the real-time vibration characteristics of the substation equipment under the first verification result or the second interference condition, and analyze the current voltage state according to the real-time vibration characteristics, wherein the real-time vibration characteristics include real-time vibration displacement, real-time vibration frequency, real-time vibration amplitude, and real-time vibration amplitude change rate; The voltage abnormal disturbance detection unit is used to obtain the voltage signal amplitude and signal duration of the corresponding difference point under the first verification result, compare the duration threshold with the signal duration, and compare the voltage signal amplitude with the standard amplitude interval, and analyze the voltage abnormality corresponding to the difference point according to the comparison result; The warning unit is used to send corresponding early warning prompt indications and voltage abnormality indications to the management end according to the analysis results.

2. The substation intelligent control system based on real-time monitoring according to claim 1 is characterized in that: The second feature analysis unit includes a vibration signal acquisition unit, a second determination subunit and a third determination subunit, wherein: The vibration signal acquisition unit is used to acquire the real-time vibration characteristics of the substation equipment under the first verification result or the second interference condition; The second determination subunit is used to perform vibration displacement determination on the real-time vibration displacement according to the standard displacement interval, and determine the current voltage state based on the vibration displacement determination result; The third determination subunit is used to generate a corresponding warning level instruction based on the vibration displacement determination result, or in combination with the determination results of the real-time vibration frequency, the real-time vibration amplitude and the real-time vibration amplitude change rate.

3. The substation intelligent control system based on real-time monitoring according to claim 2 is characterized in that: When the third determination subunit determines that the real-time vibration displacement does not fall within the standard displacement interval, the real-time vibration frequency is obtained, and the real-time vibration frequency is analyzed according to the first standard frequency and the second standard frequency. When the real-time vibration frequency is between the first standard frequency and the second standard frequency, the corresponding monitoring point is marked as a vibration mutation point, and the real-time vibration amplitude corresponding to the vibration mutation point is obtained for analysis, and a second-level early warning prompt indication or a third-level early warning prompt indication is selected to be generated according to the analysis result.

4. The substation intelligent control system based on real-time monitoring according to claim 1 is characterized in that: The voltage abnormal disturbance detection unit compares the duration threshold with the signal duration. If the signal duration is less than the duration threshold, the voltage signal amplitude is compared with the standard amplitude interval, and the corresponding voltage abnormality is determined as a voltage sag or a voltage swell based on the comparison result; If the signal duration is greater than or equal to the duration threshold, the voltage abnormality corresponding to the difference point is determined to be a voltage interruption; If the voltage signal amplitude is less than the minimum value of the standard amplitude range, the voltage abnormality corresponding to the difference point is determined to be a voltage sag; If the voltage signal amplitude is greater than the maximum value of the standard amplitude range, it is determined that the voltage abnormality corresponding to the difference point is a voltage surge.

5. The substation intelligent control system based on real-time monitoring according to claim 1 is characterized in that: The signal identification unit includes a noise reduction processing subunit and a difference point identification subunit, wherein: The noise reduction processing subunit is used to perform noise reduction processing on the original voltage signal under the first interference condition to form a real-time voltage signal; The difference point identification subunit is used to calculate the relative difference rate between the maximum value and the average value of the high-frequency coefficient modulus, compare the standard difference rate with the relative difference rate, and obtain the difference point based on the comparison result; The relative difference rate is the proportion of the portion of the maximum value exceeding the average value in the average value.

6. The substation intelligent control system based on real-time monitoring according to claim 5 is characterized in that: The noise reduction processing subunit implements the noise reduction processing by performing wavelet transform on the original voltage signal, decomposing the signal into components of different frequencies for threshold processing, and performing inverse wavelet transform on the coefficients after threshold processing to reconstruct the noise-reduced signal to form a real-time voltage signal.

7. The substation intelligent control system based on real-time monitoring according to claim 1 is characterized in that: The interference identification unit includes an environment monitoring subunit, a vibration state monitoring subunit, a fault state monitoring subunit and a load monitoring subunit, wherein: The environmental monitoring subunit is connected to an external management platform to obtain current weather data, and when the current weather is abnormal, determines that the current interference environment is a first interference situation; The fault status monitoring subunit is used to obtain the fault status of the substation equipment, and when the substation equipment is in a fault state, determine that the current interference environment is a first interference situation; The load monitoring subunit is used to monitor the load change rate in real time to determine the current interference situation; The vibration status monitoring subunit is used to obtain the real-time vibration displacement of the substation equipment and analyze the vibration status of the substation equipment based on the real-time vibration displacement.

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