Transformer substation intelligent control system based on real-time monitoring

Abstract

The invention relates to the technical field of transformer substations, in particular to a transformer substation intelligent control system based on real-time monitoring. The system comprises a data monitoring module, a communication module, a data processing module and a control module. An output voltage signal is collected in real time, the change of the output voltage signal is monitored in real time through a differential tracker, the current voltage state is analyzed, and due to the influence of severe weather, a transformer substation monitoring signal becomes unstable and inaccurate, so that the reliability of the monitoring signal needs to be accurately analyzed, namely, the reliability of the transformer substation monitoring signal is improved. The influence of external factors on the current power grid environment is analyzed in real time, whether the judgment result of interference in the current power grid environment is accurate or not is analyzed according to the voltage signal characteristics by combining the monitoring result of the substation equipment, and whether the monitoring of the voltage signal is accurate or not is verified by combining the vibration characteristics. Therefore, a closed loop is formed to determine whether the monitoring of the transformer substation is accurate, and the safety and reliability of the transformer substation are improved.

Description

Technical Field

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

[0002] Substations can monitor and control the operating status of the power system in real time, and can work in coordination with other power facilities (such as power plants, distribution networks, etc.) to optimize the distribution and use of electricity. This coordinated regulation is conducive to balancing the load of the power grid, avoiding overload and power waste. Substations are equipped with advanced monitoring and analysis tools that can perform real-time analysis of the operating status of equipment to help operation and maintenance personnel promptly identify potential problems, perform preventive maintenance, and reduce the probability of failures. How to use more efficient monitoring technology, data analysis methods, and fault diagnosis methods to ensure the safe and efficient operation of substation equipment is becoming a topic of concern to people working in related research fields.

[0003] A Chinese patent document with authorization announcement number CN112902916B discloses a substation intelligent monitoring system, which includes a concrete mounting seat, in which a mounting cabinet is installed, and slide rails are respectively provided on the left and right inner walls of the mounting cabinet in the up and down directions, and a connecting plate is slidably connected to the slide rails, and a substation cabinet is provided at the upper end of the connecting plate, and an infrared receiver corresponding to an infrared transmitter for detection is provided on one side of the substation cabinet, and the infrared receiver signal is connected to a controller, and a first rack slidably connected to the slide rail is provided at the lower end of the connecting plate, and the first rack is driven by a driving mechanism, and the driving mechanism includes a first motor and a first bevel gear provided on the output shaft of the first motor and meshed with a second bevel gear, and the second bevel gear is provided with a rotating shaft, and a third gear meshed with the first rack is provided on the rotating shaft; it can be seen that the existing substation intelligent control system cannot timely monitor voltage abnormalities due to the lack of real-time monitoring of the output voltage of the substation, resulting in poor abnormality detection effect and low accuracy. Summary of the invention

[0004] To this end, the present invention provides a substation intelligent control system based on real-time monitoring to overcome the problem in the prior art of lack of correlation analysis of voltage signals and vibration signals of substation equipment, resulting in low accuracy of real-time monitoring.

[0005] To achieve the above object, the present invention provides a substation intelligent control system based on real-time monitoring, comprising: 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 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.

[0006] Furthermore, 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, so as to obtain the real-time voltage signal and the corresponding difference point.

[0007] Furthermore, 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 second feature analysis unit is used to obtain the real-time vibration characteristics of the substation equipment under the second 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.

[0008] Furthermore, 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, the first verification result is that the voltage abnormal disturbance detection is accurate, and the second verification result is that the voltage abnormal disturbance detection is inaccurate.

[0009] Furthermore, 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 second 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.

[0010] Furthermore, when the third determination subunit determines that the real-time vibration displacement does not fall within the standard displacement interval, 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 to generate a second-level warning prompt indication or a third-level warning prompt indication according to the analysis result.

[0011] Furthermore, 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.

[0012] Furthermore, 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.

[0013] Furthermore, 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.

[0014] Furthermore, 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 monitoring subunit is used to obtain the fault status of the substation equipment, and when the substation equipment is in the fault state, determine that the current interference environment is the 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.

[0015] Compared with the prior art, the beneficial effect of the present invention lies in that the changes in the output voltage signal are monitored in real time by a differential tracker, the current voltage state is analyzed, and the mechanical vibration state, fault conditions, load fluctuation conditions and external environment of the substation equipment are monitored to identify the noise interference of equipment influencing factors on the output voltage signal, and to verify the recognition accuracy of abnormal points in the voltage signal, and to associate the vibration characteristics of the substation equipment, accurately identify power abnormalities, generate multi-level early warning prompts, improve the real-time nature of the operating status of the monitoring equipment, and improve the safety, reliability and operating efficiency of the substation through comprehensive monitoring, intelligent analysis and visual display, thereby ensuring the stable operation of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a structural schematic diagram of a substation intelligent control system based on real-time monitoring according to an embodiment of the present invention; Figure 2 This is a connection diagram of a data processing module according to an embodiment of the present invention; Figure 3 This is a connection diagram of a control module according to an embodiment of the present invention; Figure 4 Schematic diagram of the connection of the first feature analysis unit in an embodiment of the present invention. DETAILED DESCRIPTION

[0017] In order to make the objects and advantages of the present invention more clearly understood, the present invention is 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.

[0018] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0019] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0020] In addition, it should be noted that in the description of the present invention, 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 those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] See also Figure 1 As shown, it is a schematic diagram of the structure of a substation intelligent control system based on real-time monitoring according to an embodiment of the present invention. The present invention provides a substation intelligent control system based on real-time monitoring, including: 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 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 early warning prompt level of the abnormal voltage fluctuation.

[0022] In this embodiment, a visualized digital substation is established through digital twin technology to realize 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. The substation environment visualization is to restore the actual substation cabinet location, power distribution equipment, transmission equipment and other facilities layout to the virtual room three-dimensional model scene, and timely issue early warning signals by monitoring the operation of the equipment; the asset configuration visualization is to import the basic information of the 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 improved through historical query records; the substation Cabinet visualization will display the U position of the substation cabinet on the platform, distinguish the cabinet functions by color, and describe the cabinet status by bar chart; 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, which can realize the timely acquisition of operation data and fault data, and timely send alarm prompts to the management end to find equipment problems and solve alarm conditions; the differential tracker is connected to the voltage sensor and installed near the key electrical equipment of the substation, such as transformers, switchgear, etc., 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 status. By monitoring the mechanical vibration status, fault conditions, load fluctuations and external environment of the substation equipment, the noise interference of the equipment influencing factors on the output voltage signal can be identified, and the recognition accuracy of abnormal points in the voltage signal can be verified, and the vibration characteristics of the substation equipment can be associated to accurately identify power abnormalities, generate multi-level early warning prompts, and improve the real-time nature of the operation status of the monitoring equipment. Through comprehensive monitoring, intelligent analysis and visualization display, the safety, reliability and operation efficiency of the substation are improved, and the stable operation of the power system is ensured.

[0023] 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 real-time analysis of the impact of external factors on the current power grid environment, and by combining the monitoring results of the substation equipment, that is, analyzing whether the judgment result of the interference in the current power grid environment is accurate based on the voltage signal characteristics, and verifying whether the monitoring of the voltage signal is accurate by combining the vibration characteristics, so as to form a closed loop to determine whether the substation monitoring is accurate.

[0024] Specifically, 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 noise reduction process is to perform wavelet transform on the original voltage signal, decompose the signal into components of different frequencies, perform 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; 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.

[0025] In this embodiment, the noise reduction processing subunit performs wavelet transform on the original voltage signal to decompose the signal into components of different frequencies. The wavelet basis Daubechies wavelet or Symlets wavelet can be selected for wavelet transform. After the wavelet transform, the high-frequency coefficients obtained contain noise. By setting a threshold, these high-frequency coefficients are processed. The absolute value of the high-frequency coefficient is subtracted from the threshold. If the result is negative, it is set to zero, otherwise the original value is maintained. The wavelet transform and inverse transform are quickly calculated by the Mallat algorithm to reconstruct the processed signal into the original signal. The outlier identification subunit completes the outlier detection by applying the wavelet transform modulus maximum method to the filtered voltage signal. First, the maximum and average values ​​of the modulus of the first-layer high-frequency coefficients of the voltage signal are calculated, and then the relative difference rate is calculated. The relative difference rate = (maximum value - average value) / average value. The standard difference rate is set. If the relative difference rate is greater than the standard difference rate, it is detected as an outlier. 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. If the relative difference rate is greater than 0.5, the signal is marked as a difference point.

[0026] See also Figure 2 As shown, it is a connection diagram of the data processing module according to an embodiment of the present invention; Specifically, 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, so as to obtain the real-time voltage signal and the corresponding difference point.

[0027] See also Figure 3 As shown, it is a connection diagram of the control module according to an embodiment of the present invention; 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, 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 second feature analysis unit is used to obtain the real-time vibration characteristics of the substation equipment under the second 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 terminal according to the analysis results; The abnormal voltage condition indication includes voltage interruption, voltage temporary rise and voltage temporary drop.

[0028] Specifically, 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.

[0029] See also Figure 4 As shown, it is a connection diagram of the first feature analysis unit according to an embodiment of the present invention; Specifically, the first feature 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; The first verification result is that the voltage abnormal disturbance detection is accurate, and the second verification result is that the voltage abnormal disturbance detection is inaccurate; When the voltage signal amplitudes are all within the standard amplitude range, it is determined that the voltage abnormal disturbance detection is inaccurate; When the voltage signal amplitude is not within the standard amplitude range, it is determined that the voltage abnormal disturbance detection is accurate; In this embodiment, the first interference situation indicates that the interference identification unit monitors the interference in the current power grid environment in real time, and the second interference situation indicates that the interference identification unit does not monitor the interference in the current power grid environment; the interference in the current power grid environment includes excessive load, equipment failure or heavy rain; by correlating the monitoring results of the substation equipment by the interference identification unit, it is verified 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 subunit in the interference identification unit monitors that the current weather data corresponds to a period of strong winds and heavy rain, at this time, it will cause abnormal fluctuations in the voltage signal, that is, there is a voltage signal amplitude that is not within the standard amplitude range. Then, at this time, a second verification result will be obtained, indicating that the voltage abnormal disturbance detection is accurate. On the contrary, it indicates that the voltage abnormal disturbance detection is inaccurate. It is necessary to associate the vibration signal characteristics of the substation equipment, indirectly analyze the voltage state, and timely identify the voltage abnormality, and perform a graded warning. The graded warning prompt indicates the level of abnormal voltage fluctuation. The higher the level, the more obvious the abnormal voltage fluctuation. The graded warning includes a first-level warning prompt indication, a second-level warning prompt indication, and a third-level warning prompt indication.

[0030] The standard amplitude range in this embodiment represents the threshold value of the set voltage amplitude, which is set between 198V-38.5kV. The set value is related to the type and operating conditions of the equipment, and is set to 900V-1100V in this embodiment.

[0031] Specifically, 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 second 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.

[0032] If the real-time vibration displacement falls within the standard displacement range, the third determination subunit determines that the current voltage state is normal; If the real-time vibration displacement does not fall within the standard displacement interval, the third determination subunit obtains the real-time vibration frequency, analyzes the real-time vibration frequency according to the first standard frequency and the second standard frequency, 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 warning prompt indication is given; 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 obtained for analysis, and a second-level warning prompt indication or a third-level warning prompt indication is generated according to the analysis result; If the real-time vibration frequency is greater than the second standard frequency, a third-level warning prompt indication will be given.

[0033] The standard displacement interval in this embodiment represents the allowable vibration error of the substation equipment. The set value is related to the safety requirements, operating environment and type of the equipment under test. Generally, it is set in the range of 0.01mm-0.1m and is selected according to the actual equipment type; the set first standard vibration frequency is close to zero, generally set to between 0.01-0.02, the second standard vibration frequency represents the vibration frequency limit, that is, the actual vibration frequency is higher than the second standard vibration frequency, that is, high-frequency vibration, generally set to between 0.5-0.7, and is selected according to the actual safety requirements and equipment type; the set first standard vibration frequency represents the boundary value of the normal vibration state of the equipment, which can be set to 2.3 mm per second, and the second standard vibration frequency represents the boundary value of the abnormal vibration state of the equipment, which can be set to 10.1 mm per second; the set standard vibration amplitude is 2.8 mm per second, and the set value can also be adjusted according to the actual safety requirements and equipment type; the set standard vibration amplitude change rate is close to zero, set to 0.01 mm per second.

[0034] Specifically, the standard vibration amplitude is compared with the real-time vibration amplitude. If the real-time vibration amplitude is less than the standard vibration amplitude, another vibration mutation point is obtained after a preset collection interval, the real-time vibration amplitude change rate is calculated, and the real-time vibration amplitude change rate is determined according to the standard vibration amplitude change rate to select the generation of a second-level warning prompt indication or a third-level warning prompt indication; If the real-time vibration amplitude is greater than or equal to the standard vibration amplitude, a third-level warning prompt will be given; In this embodiment, the first-level warning prompt indication is that the interference level is low and has almost no negative impact on the equipment; the second-level warning prompt indication is that the voltage fluctuation trend is gradually increasing; the third-level warning prompt indication is that the voltage fluctuation is abnormal; the real-time vibration amplitude change rate is greater than or equal to the standard vibration amplitude change rate, and a second-level warning prompt indication is generated; the real-time vibration amplitude change rate is less than the standard vibration amplitude change rate, and a first-level warning prompt indication is generated.

[0035] By determining that the real-time vibration amplitude change rate is greater than or equal to the standard vibration amplitude change rate, it means that the amplitude is small, but the amplitude tends to increase. At this time, the equipment operation status is relatively dangerous, and the voltage fluctuation trend is gradually increasing. Progressive faults that are difficult to detect are discovered in time, increasing the timeliness of discovering potential faults.

[0036] Specifically, 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, and when the current weather is normal, determines that the current interference environment is a second interference situation; The fault monitoring subunit is used to obtain the fault state of the substation equipment, and when the substation equipment is in the fault state, determine that the current interference environment is the first interference situation, otherwise, determine that the current interference environment is the second interference situation; The load monitoring subunit is used to monitor the load change rate in real time to determine the current interference situation. When the load change rate is greater than or equal to a threshold, the current interference environment is determined to be the first interference situation; otherwise, the current interference environment is determined to be the second interference situation.

[0037] The first interference situation in this embodiment indicates that there are grid fluctuations caused by external influences, which in turn interfere with the original voltage signal. Therefore, it is necessary to perform noise reduction processing on the measured voltage signal to obtain a difference value with higher accuracy. At the same time, in the first interference situation, the voltage signal detection accuracy is verified to avoid low voltage signal detection accuracy and failure to timely identify abnormal voltage conditions of substation equipment.

[0038] The load, equipment failure and weather conditions are monitored through the interference identification unit. When the load is too high, the equipment fails or there is heavy rain, it may cause abnormal fluctuations in the voltage signal. Therefore, the voltage signal is detected in real time to verify the accuracy of abnormal voltage disturbance detection.

[0039] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying 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 the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, 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 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.

2. The substation intelligent control system based on real-time monitoring according to claim 1 is characterized in that: 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.

3. The substation intelligent control system based on real-time monitoring according to claim 1 is characterized in that: 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 second feature analysis unit is used to obtain the real-time vibration characteristics of the substation equipment under the second 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.

4. The substation intelligent control system based on real-time monitoring according to claim 3 is characterized in that: 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 amplitude is within the standard amplitude range, it is judged that the voltage abnormal disturbance detection is inaccurate; when the voltage signal amplitude is not within the standard amplitude range, it is judged that the voltage abnormal disturbance detection is accurate; the first verification result is that the voltage abnormal disturbance detection is accurate, and the second verification result is that the voltage abnormal disturbance detection is inaccurate.

5. The substation intelligent control system based on real-time monitoring according to claim 3 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 second 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.

6. The substation intelligent control system based on real-time monitoring according to claim 5 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.

7. The substation intelligent control system based on real-time monitoring according to claim 3 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.

8. The substation intelligent control system based on real-time monitoring according to claim 2 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.

9. The substation intelligent control system based on real-time monitoring according to claim 8 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.

10. The intelligent control system for substation based on real-time monitoring according to claim 2 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 monitoring subunit is used to obtain the fault status of the substation equipment, and when the substation equipment is in the fault state, determine that the current interference environment is the 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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