An artificial intelligence-based harmonic power metering control system

Abstract

The present invention relates to the technical field of harmonic power metering, and specifically discloses a harmonic power metering control system based on artificial intelligence, including a harmonic data acquisition module, a harmonic data preprocessing module, a harmonic power data analysis module, a harmonic data error analysis module, a harmonic power comprehensive analysis module, a metering error evaluation module, and a management and warning module; by collecting harmonic data from the power grid and preprocessing it, the present invention analyzes and obtains harmonic voltage error indicators, harmonic current error indicators, and harmonic active power error indicators, and further analyzes and obtains a harmonic power metering error evaluation index. By introducing artificial intelligence technology, it realizes the precise detection and real-time error metering analysis of power system harmonics, evaluates the power metering error, controls the power metering error, improves the accuracy and reliability of power metering, and ensures the safe and stable operation of the power grid.

Description

Technical Field

[0001] The present invention relates to the technical field of harmonic power metering, and particularly to a harmonic power metering control system based on artificial intelligence. Background Art

[0002] As a special product, the quality of electric energy has been widely emphasized by many departments such as electric power production, transmission, utilization, and management. The modern power grid plays a crucial role in society and economy. With the rapid development of power electronics technology, the number of non-linear loads such as various high-power rectifiers, converters, and electric arc furnaces is increasing day by day, resulting in different degrees of distortion of the voltage and current waveforms in the power supply system, generating a large number of high-order harmonics, which pose hazards to the safe and economic operation of the power supply system.

[0003] Harmonics refer to the waveform components in a periodic waveform whose frequencies are integer multiples of the fundamental frequency. In the power system, harmonics are mainly caused by non-linear loads. Harmonics will lead to errors in power metering, thus affecting the fairness and accuracy of power transactions.

[0004] Traditional harmonic power metering control systems mainly focus on identifying and quantitatively analyzing the harmonic components in the power system. These systems evaluate the power quality by collecting the detection of harmonic voltage and current, measuring the harmonic frequency and amplitude, and metering the fundamental wave and total electric energy. However, although these methods achieve harmonic detection to a certain extent, they often have the following limitations: Firstly, there are problems such as limited detection accuracy, poor real-time performance, and susceptibility to noise interference. Secondly, due to the complexity of data processing and analysis, traditional systems often have difficulty meeting the requirements of modern power systems in terms of the real-time performance of harmonic detection, especially in the case of rapid harmonic changes or emergencies; In addition, traditional control systems focus on the analysis of harmonic components in the power system and do not perform data analysis on metering errors, resulting in inaccurate and unreliable power metering.

[0005] Therefore, the present invention evaluates the power metering error by real-time analysis of the error of harmonic power metering, controls the metering error, and improves the accuracy and reliability of power metering. Summary of the Invention

[0006] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a harmonic power metering control system based on artificial intelligence to solve the problems raised in the above background art.

[0007] To achieve the above object, the present invention provides the following technical solution: A harmonic power metering control system based on artificial intelligence includes a harmonic data acquisition module, a harmonic data preprocessing module, a harmonic power data analysis module, a harmonic data error analysis module, a harmonic power comprehensive analysis module, a metering error evaluation module, and a management warning module.

[0008] Harmonic data acquisition module: It is used to collect the comprehensive parameters of harmonic data from the power grid and transmit the collected comprehensive parameters to the harmonic data preprocessing module. The harmonic data acquisition module includes a harmonic voltage data acquisition unit, a harmonic current data acquisition unit, and a harmonic active power data acquisition unit;

[0009] Harmonic data preprocessing module: It is used to preprocess the comprehensive parameters collected by the harmonic data acquisition module and transmit the preprocessed data to the harmonic power data analysis module;

[0010] Harmonic power data analysis module: It is used to import the preprocessed harmonic data into the corresponding mathematical model to calculate the harmonic voltage error index, harmonic current error index, and harmonic active power error index, and transmit the calculation results to the harmonic data error analysis module;

[0011] Harmonic data error analysis module: It is used to compare the data transmitted by the harmonic power data analysis module with the preset value to determine whether there is a measurement error. If there is a measurement error, it will send the abnormal result to the operation and maintenance management personnel;

[0012] Harmonic power comprehensive analysis module: It inputs the harmonic voltage error index, harmonic current error index, and harmonic active power error index into the established mathematical model to calculate the harmonic power measurement error evaluation index, and transmits the calculation results to the measurement error evaluation module;

[0013] Measurement error evaluation module: It is used to establish a harmonic power measurement error model and conduct a comparative analysis, and transmit the comparative analysis results to the management warning module;

[0014] Management warning module: It is used to monitor the changes in harmonic power in the power system in real time, and perform output or storage processing on the analysis results of the power measurement error data, and provide an alarm mechanism to remind the operation and maintenance personnel to take timely measures to handle abnormal situations.

[0015] Preferably, the harmonic voltage data acquisition unit is used to collect harmonic voltage parameters, and the harmonic voltage parameters include the effective value of the h - th harmonic voltage, the initial phase angle of the h - th harmonic voltage, the fundamental angular frequency, and the effective value of the fundamental voltage; the harmonic current data acquisition unit is used to collect harmonic current parameters, and the harmonic current parameters include the effective value of the h - th harmonic current, the initial phase angle of the h - th harmonic current, the fundamental angular frequency, and the effective value of the fundamental current; the harmonic active power data acquisition unit is used to collect harmonic active power parameters, and the harmonic active power parameters include the effective value of the h - th harmonic voltage, the initial phase angle of the h - th harmonic voltage, the effective value of the h - th harmonic current, the initial phase angle of the h - th harmonic current, the effective value of the fundamental voltage, the effective value of the fundamental current, and the phase difference between the fundamental voltage and the fundamental current.

[0016] Preferably, the preprocessing method of the harmonic data preprocessing module for the collected data is specifically to perform noise reduction processing, outlier detection, and outlier processing on the data through existing filtering technologies.

[0017] Preferably, the calculation steps of the harmonic voltage error index are as follows:

[0018] Step S01: Calculate the distorted voltage, and the calculation model is as follows:

[0019] , where represents the distorted voltage at time t, represents the effective value of the h -th harmonic voltage, represents the initial phase angle of the h -th harmonic voltage, N represents the highest harmonic number in the waveform, h represents the h -th harmonic, represents the fundamental angular frequency, and t represents the time variable;

[0020] Step S02: Calculate the total harmonic distortion rate of voltage, and the calculation model is as follows:

[0021] , where , represents the harmonic voltage content rate of the h -th harmonic, represents the effective value of the h -th harmonic voltage, represents the effective value of the fundamental voltage, N represents the highest harmonic number of the voltage intercepted, N ≤ 50;

[0022] Step S03: Calculate the harmonic voltage error index, and the calculation model is as follows:

[0023] , where represents the harmonic voltage error index, represents the distorted voltage at time t, represents the preset standard distorted voltage at time t, represents the total harmonic voltage effective value, represents the effective value of the h -th harmonic voltage, represents the effective value of the fundamental voltage, N represents the highest harmonic number of the voltage intercepted, N ≤ 50, represents the total harmonic distortion rate of voltage, represents the upper limit of the preset total harmonic distortion rate of voltage.

[0024] Preferably, the calculation steps of the harmonic current error index are as follows:

[0025] Step S01: Calculate the distorted current, and the calculation model is as follows:

[0026] , where It is expressed as the distortion current at time t, It is expressed as the effective value of the h - th harmonic current, It is expressed as the initial phase angle of the h - th harmonic current, N is expressed as the highest harmonic order in the waveform, and h is expressed as the h - th harmonic, It is expressed as the fundamental angular frequency, and t is expressed as the time variable;

[0027] Step S02: Calculate the total harmonic distortion rate of the current. The calculation model is as follows:

[0028] , where, , It is expressed as the content rate of the h - th harmonic current, It is expressed as the effective value of the h - th harmonic current, It is expressed as the effective value of the fundamental current, N is expressed as the highest harmonic order of the current intercepted, and N ≤ 50;

[0029] Step S03: Calculate the harmonic current error index. The calculation model is as follows:

[0030] , where, It is expressed as the harmonic current error index, It is expressed as the distortion current at time t, It is expressed as the preset standard distortion current at time t, It is expressed as the effective value of the total harmonic current, It is expressed as the effective value of the h - th harmonic current, It is expressed as the effective value of the fundamental current, N is expressed as the highest harmonic order of the current intercepted, N ≤ 50, It is expressed as the total harmonic distortion rate of the current, It is expressed as the upper limit of the preset total harmonic distortion rate of the current.

[0031] Preferably, the calculation steps of the harmonic active power error index are as follows:

[0032] Step S01: Calculate the harmonic active power. The calculation model is as follows:

[0033] , where, It is expressed as the harmonic active power, T is expressed as the period of the AC voltage and AC current, It is expressed as the effective value of the h - th harmonic voltage, It is expressed as the initial phase angle of the h - th harmonic voltage, It is expressed as the effective value of the h - th harmonic current, It is expressed as the initial phase angle of the h - th harmonic current, N is expressed as the highest harmonic order in the waveform, and h is expressed as the h - th harmonic, It is expressed as the fundamental angular frequency, and t is expressed as the time variable.

[0034] Step S02: Calculate the harmonic active power error index. The calculation model is as follows:

[0035] , where is expressed as the harmonic active power error index, is expressed as the harmonic active power, , is expressed as the fundamental active power, is expressed as the effective value of the fundamental voltage, is expressed as the effective value of the fundamental current, is expressed as the phase difference between the fundamental voltage and the fundamental current.

[0036] Preferably, the specific method for the harmonic data error analysis module to compare and judge the data transmitted by the harmonic power data analysis module with the preset value is as follows:

[0037] Extract the harmonic voltage error index . If the harmonic voltage error index is greater than the harmonic voltage error index threshold , it is determined that there is a measurement error in the harmonic voltage, and the abnormal result is sent to the operation and maintenance management personnel. Otherwise, it indicates that there is no measurement error in the harmonic voltage;

[0038] Extract the harmonic current error index . If the harmonic current error index is greater than the harmonic current error index threshold , it is determined that there is a measurement error in the harmonic current, and the abnormal result is sent to the operation and maintenance management personnel. Otherwise, it indicates that there is no measurement error in the harmonic current;

[0039] Extract the harmonic active power error index . If the harmonic active power error index is greater than the harmonic active power error index threshold , it is determined that there is a measurement error in the harmonic active power, and the abnormal result is sent to the operation and maintenance management personnel. Otherwise, it indicates that there is no measurement error in the harmonic active power.

[0040] Preferably, the calculation model of the harmonic power measurement error evaluation index is as follows:

[0041] , where is expressed as the harmonic power measurement error evaluation index, is expressed as the harmonic voltage error index, is expressed as the harmonic current error index, is expressed as the harmonic active power error index, Other influencing factors expressed as error evaluation indices.

[0042] Preferably, the harmonic power metering error model is: , where represents the harmonic power metering error evaluation index calculated from the measured value, represents the harmonic power metering error evaluation index calculated theoretically. If η is greater than 1, it indicates that there is a metering error in harmonic power; otherwise, it indicates that there is no metering error in harmonic power.

[0043] Technical effects and advantages of the present invention:

[0044] 1. Through the analysis of metering errors, the present invention realizes high-precision harmonic power metering, enhances real-time monitoring capabilities, improves data analysis efficiency, and raises the intelligent level of the entire system. By adopting advanced artificial intelligence technology, it provides more accurate power metering and more comprehensive power quality monitoring for the power system to meet the future power system's requirements for high power quality and intelligent management.

[0045] 2. The present invention combines artificial intelligence technology to accurately analyze the harmonic data collected from the power grid, evaluate the power metering error, and improve the accuracy and reliability of power metering.

[0046] 3. By collecting harmonic data from the power grid and performing preprocessing, the present invention analyzes and obtains harmonic voltage error indices, harmonic current error indices, and harmonic active power error indices, and then analyzes and obtains the harmonic power metering error evaluation index. By introducing artificial intelligence technology, it realizes precise detection of power system harmonics and real-time error metering analysis, improves power quality, and ensures the safe and stable operation of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The present invention is further described with reference to the accompanying drawings. However, the embodiments in the drawings do not constitute any limitation to the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on the following drawings without creative efforts.

[0048] Figure 1 is a schematic diagram of the overall system structure of the present invention.

[0049] Figure 2 is a schematic diagram of the structure of the acquisition unit of the harmonic data acquisition module of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0050] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0051] Please refer to Figure 1-2 As shown, the present invention provides a harmonic power metering control system based on artificial intelligence, including a harmonic data acquisition module, a harmonic data preprocessing module, a harmonic power data analysis module, a harmonic data error analysis module, a harmonic power comprehensive analysis module, a metering error evaluation module, and a management warning module.

[0052] The output end of the harmonic data acquisition module is electrically connected to the input end of the harmonic data preprocessing module, the output end of the harmonic data preprocessing module is electrically connected to the input end of the harmonic power data analysis module, the output end of the harmonic power data analysis module is electrically connected to the input end of the harmonic data error analysis module, the output end of the harmonic data error analysis module is respectively electrically connected to the input end of the harmonic power comprehensive analysis module and the input end of the management warning module, the output end of the harmonic power comprehensive analysis module is respectively electrically connected to the input end of the metering error evaluation module and the input end of the management warning module, and the output end of the metering error evaluation module is electrically connected to the input end of the management warning module.

[0053] The harmonic data acquisition module is used to collect the comprehensive parameters of harmonic data from the power grid and transmit the collected comprehensive parameters to the harmonic data preprocessing module. The harmonic data acquisition module includes a harmonic voltage data acquisition unit, a harmonic current data acquisition unit, and a harmonic active power data acquisition unit;

[0054] In this embodiment, it should be specifically noted that the harmonic voltage data acquisition unit is used to collect harmonic voltage parameters, and the harmonic voltage parameters include the effective value of the h - th harmonic voltage, the initial phase angle of the h - th harmonic voltage, the fundamental angular frequency, and the effective value of the fundamental voltage; the harmonic current data acquisition unit is used to collect harmonic current parameters, and the harmonic current parameters include the effective value of the h - th harmonic current, the initial phase angle of the h - th harmonic current, the fundamental angular frequency, and the effective value of the fundamental current; the harmonic active power data acquisition unit is used to collect harmonic active power parameters, and the harmonic active power parameters include the effective value of the h - th harmonic voltage, the initial phase angle of the h - th harmonic voltage, the effective value of the h - th harmonic current, the initial phase angle of the h - th harmonic current, the effective value of the fundamental voltage, the effective value of the fundamental current, and the phase difference between the fundamental voltage and the fundamental current.

[0055] The harmonic data preprocessing module is used to preprocess the comprehensive parameters collected by the harmonic data acquisition module and transmit the preprocessed data to the harmonic power data analysis module;

[0056] In this embodiment, it should be specifically noted that the preprocessing method of the data collected by the harmonic data preprocessing module is specifically to perform noise reduction processing, outlier detection, and outlier processing on the data through existing filtering technologies.

[0057] The harmonic power data analysis module is used to import the preprocessed harmonic data into the corresponding mathematical model to calculate the harmonic voltage error index, harmonic current error index, and harmonic active power error index, and transmit the calculation results to the harmonic data error analysis module;

[0058] In this embodiment, it should be specifically noted that the calculation steps of the harmonic voltage error index are as follows:

[0059] Step S01: Calculate the distorted voltage, and the calculation model is as follows:

[0060] , where, represents the distorted voltage at time t, represents the effective value of the h - th harmonic voltage, represents the initial phase angle of the h - th harmonic voltage, N represents the highest harmonic number in the waveform, h represents the h - th harmonic, represents the fundamental angular frequency, and t represents the time variable;

[0061] In this embodiment, it should be specifically noted that the effective value of voltage, the initial phase angle of voltage, and the fundamental angular frequency are important parameters in the power system, and they can be directly obtained through measuring instruments such as oscilloscopes or multimeters.

[0062] In this embodiment, it should be specifically noted that if direct current and alternating current are respectively passed through two identical resistor devices, and the heat generated by them is equal within one cycle of the alternating current, then the voltage value of this direct current is taken as the effective value of the alternating current voltage.

[0063] Step S02: Calculate the total harmonic distortion rate of voltage, and the calculation model is as follows:

[0064] , where, , represents the h - th harmonic voltage content rate, represents the effective value of the h - th harmonic voltage, represents the effective value of the fundamental voltage, N represents the highest harmonic number intercepted by the voltage, and N ≤ 50;

[0065] Step S03: Calculate the harmonic voltage error index, and the calculation model is as follows:

[0066] , where is expressed as the harmonic voltage error index, is expressed as the distorted voltage at time t, is expressed as the preset standard distorted voltage at time t, is expressed as the total harmonic voltage effective value, is expressed as the effective value of the h - th harmonic voltage, is expressed as the fundamental voltage effective value, N represents the highest harmonic number intercepted by the voltage, N ≤ 50, is expressed as the total harmonic distortion rate of voltage, is expressed as the upper limit of the preset total harmonic distortion rate of voltage.

[0067] In this embodiment, it should be specifically noted that the upper limit of the total harmonic distortion rate of voltage varies according to the voltage level of the power grid and national standards. In China, according to GB / T 14549 - 93 "Power Quality - Harmonics in Public Power Grids" and subsequent possible relevant updates or alternative standards, the upper limits of the total harmonic distortion rate of the voltage of each level of public power grid (phase voltage) are roughly as follows: for the power grid voltage level of 0.38 kv, the upper limit of the total harmonic distortion rate of voltage is 5.0%; for the power grid voltage level of 6 - 10 kv, the upper limit of the total harmonic distortion rate of voltage is 4.0%; for the power grid voltage level of 35 kv, the upper limit of the total harmonic distortion rate of voltage is 3.0%; for the power grid voltage level of 110 kv, the upper limit of the total harmonic distortion rate of voltage is 2.0%. The specific values may vary due to standard updates or regional differences. In practical applications, the latest national standards or regional specifications should be referred to.

[0068] In this embodiment, it should be specifically noted that the harmonic voltage content rate directly reflects the content of harmonic voltage in the power system and is an important indicator for evaluating the degree of harmonic pollution in the system. A high harmonic voltage content rate may lead to a decrease in system stability and affect the normal operation of power equipment. Therefore, by monitoring the harmonic voltage content rate, system stability problems can be detected in a timely manner, and corresponding measures can be taken for adjustment and improvement. Harmonic voltage can cause the non - linear saturation of voltage transformers and change the frequency response characteristics of voltage transformers. These factors will cause an error of about 10% in voltage measurement.

[0069] In this embodiment, it should be specifically noted that the calculation steps of the harmonic current error index are as follows:

[0070] Step S01: Calculate the distorted current, and the calculation model is as follows:

[0071] , where is expressed as the distorted current at time t, is expressed as the effective value of the h - th harmonic current, is expressed as the initial phase angle of the h - th harmonic current, N is expressed as the highest harmonic order in the waveform, and h represents the h - th harmonic, is expressed as the fundamental angular frequency, and t represents the time variable;

[0072] In this embodiment, it should be specifically noted that the effective value of the current, the initial phase angle of the current, and the fundamental angular frequency are important parameters in the power system, and they can be directly obtained through measuring instruments such as oscilloscopes or multimeters.

[0073] In this embodiment, it should be specifically noted that the effective value of the current refers to passing a direct current and an alternating current through resistors with the same resistance value respectively. If the heat generated by the two currents passing through the resistors is the same within the same time, then it is said that the current value of this direct current is the effective value of this alternating current.

[0074] Step S02: Calculate the total harmonic distortion rate of the current. The calculation model is as follows:

[0075] , where, , is expressed as the harmonic current content rate of the h - th harmonic, is expressed as the effective value of the h - th harmonic current, is expressed as the effective value of the fundamental current, N is expressed as the highest harmonic order intercepted by the current, and N ≤ 50;

[0076] Step S03: Calculate the harmonic current error index. The calculation model is as follows:

[0077] , where, is expressed as the harmonic current error index, is expressed as the distorted current at time t, is expressed as the preset standard distorted current at time t, is expressed as the total harmonic current effective value, is expressed as the effective value of the h - th harmonic current, is expressed as the effective value of the fundamental current, N is expressed as the highest harmonic order intercepted by the current, N ≤ 50, is expressed as the total harmonic distortion rate of the current, is expressed as the upper limit of the preset total harmonic distortion rate of the current.

[0078] In this embodiment, it should be specifically noted that the harmonic current content ratio directly reflects the content of harmonic current in the power system and is an important indicator for evaluating the degree of harmonic pollution in the system. A high harmonic current content ratio may lead to a decrease in system stability and affect the normal operation of power equipment. Therefore, by monitoring the harmonic current content ratio, system stability problems can be detected in a timely manner, and corresponding measures can be taken for adjustment and improvement. Harmonic current can cause non-linear saturation of current transformers, resulting in current measurement errors. In addition, harmonic current can also change the frequency response characteristics of current transformers, thus affecting the accuracy of current measurement.

[0079] In this embodiment, it should be specifically noted that the calculation steps of the harmonic active power error index are as follows:

[0080] Step S01: Calculate the harmonic active power. The calculation model is as follows:

[0081] , where represents the harmonic active power, T represents the period of the AC voltage and AC current, represents the effective value of the h-th harmonic voltage, represents the initial phase angle of the h-th harmonic voltage, represents the effective value of the h-th harmonic current, represents the initial phase angle of the h-th harmonic current, N represents the highest harmonic number in the waveform, h represents the h-th harmonic, represents the fundamental angular frequency, and t represents the time variable.

[0082] Step S02: Calculate the harmonic active power error index. The calculation model is as follows:

[0083] , where represents the harmonic active power error index, represents the harmonic active power, , represents the fundamental active power, represents the effective value of the fundamental voltage, represents the effective value of the fundamental current, represents the phase difference between the fundamental voltage and the fundamental current.

[0084] In this embodiment, it should be specifically noted that calculating the harmonic active power error index helps to evaluate the impact of harmonics on the accuracy of electric energy metering in the power system. In addition, due to the phase difference between different harmonics, there will also be a phase error in the power meter.

[0085] The harmonic data error analysis module is used to compare the data transmitted by the harmonic power analysis module with a preset value to determine whether there is a measurement error. If there is a measurement error, an abnormal result will be sent to the operation and maintenance management personnel;

[0086] In this embodiment, it should be specifically noted that the specific method for the harmonic data error analysis module to compare the data transmitted by the harmonic power analysis module with the preset value is as follows:

[0087] Extract the harmonic voltage error index , if the harmonic voltage error index is greater than the harmonic voltage error index threshold , it is determined that there is a measurement error in the harmonic voltage, and an abnormal result will be sent to the operation and maintenance management personnel. Otherwise, it indicates that there is no measurement error in the harmonic voltage;

[0088] Extract the harmonic current error index , if the harmonic current error index is greater than the harmonic current error index threshold , it is determined that there is a measurement error in the harmonic current, and an abnormal result will be sent to the operation and maintenance management personnel. Otherwise, it indicates that there is no measurement error in the harmonic current;

[0089] Extract the harmonic active power error index , if the harmonic active power error index is greater than the harmonic active power error index threshold , it is determined that there is a measurement error in the harmonic active power, and an abnormal result will be sent to the operation and maintenance management personnel. Otherwise, it indicates that there is no measurement error in the harmonic active power.

[0090] The harmonic power comprehensive analysis module inputs the harmonic voltage error index, harmonic current error index, and harmonic active power error index into the established mathematical model to calculate the harmonic power measurement error evaluation index, and transmits the calculation result to the measurement error evaluation module;

[0091] In this embodiment, it should be specifically noted that the calculation model of the harmonic power measurement error evaluation index is as follows:

[0092] , where represents the harmonic power measurement error evaluation index, represents the harmonic voltage error index, represents the harmonic current error index, represents the harmonic active power error index, represents other influencing factors of the error evaluation index.

[0093] The measurement error evaluation module is used to establish a harmonic power measurement error model and conduct comparative analysis, and transmit the comparative analysis results to the management and warning module;

[0094] In this embodiment, it should be specifically noted that the harmonic power measurement error model is: , where represents the harmonic power measurement error evaluation index calculated from the measured value, represents the harmonic power measurement error evaluation index calculated theoretically. If η is greater than 1, it indicates that there is a measurement error in harmonic power; otherwise, it indicates that there is no measurement error in harmonic power.

[0095] The management and warning module is used to monitor the changes in harmonic power in the power system in real time, and perform output or storage processing on the analysis results of the power measurement error data, and provide an alarm mechanism to remind the operation and maintenance personnel to take measures in time to handle abnormal situations.

[0096] Finally: The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

[0097] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, and all of them should be covered by the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A harmonic electric energy metering control system based on artificial intelligence, characterized in that: include: Harmonic data acquisition module: used to collect comprehensive parameters of harmonic data from the power grid and transmit the collected comprehensive parameters to the harmonic data preprocessing module. The harmonic data acquisition module includes a harmonic voltage data acquisition unit, a harmonic current data acquisition unit and a harmonic active power data acquisition unit; Harmonic data preprocessing module: used to preprocess the comprehensive parameters collected by the harmonic data acquisition module, and transmit the preprocessed data to the harmonic power data analysis module; Harmonic power data analysis module: used to import the pre-processed harmonic data into the corresponding mathematical model to calculate the harmonic voltage error index, harmonic current error index and harmonic active power error index, and transmit the calculation results to the harmonic data error analysis module; Harmonic data error analysis module: used to compare the data transmitted by the harmonic power data analysis module with the preset value to determine whether there is a metering error. If there is a metering error, the abnormal result will be sent to the operation and maintenance management personnel; Harmonic power comprehensive analysis module: input the harmonic voltage error index, harmonic current error index and harmonic active power error index into the established mathematical model to calculate the harmonic power metering error evaluation index, and transmit the calculation result to the metering error evaluation module; The harmonic electric energy metering error evaluation index calculation model is as follows: ,in, Expressed as harmonic energy metering error evaluation index, Expressed as harmonic voltage error index, Expressed as harmonic current error index, Expressed as harmonic active power error index, Other influencing factors expressed as error assessment index; Metering error evaluation module: used to establish harmonic power metering error model and conduct comparative analysis, and transmit the comparative analysis results to the management and early warning module; The harmonic electric energy measurement error model is: ,in, It represents the harmonic energy metering error evaluation index calculated for the measured value, It is expressed as the theoretically calculated harmonic electric energy measurement error evaluation index. If η is greater than 1, it indicates that there is a measurement error in the harmonic electric energy. Otherwise, it indicates that there is no measurement error in the harmonic electric energy. Management and early warning module: used to monitor the changes in harmonic power in the power system in real time, and output or store the analysis results of power metering error data, and provide an alarm mechanism to remind operation and maintenance personnel to take timely measures to deal with abnormal situations.

2. The harmonic electric energy metering control system based on artificial intelligence according to claim 1 is characterized in that: The harmonic voltage data acquisition unit is used to acquire harmonic voltage parameters, and the harmonic voltage parameters include the effective value of the h-th harmonic voltage, the initial phase angle of the h-th harmonic voltage, the fundamental angular frequency and the effective value of the fundamental voltage; the harmonic current data acquisition unit is used to acquire harmonic current parameters, and the harmonic current parameters include the effective value of the h-th harmonic current, the initial phase angle of the h-th harmonic current, the fundamental angular frequency and the effective value of the fundamental current; the harmonic active power data acquisition unit is used to acquire harmonic active power parameters, and the harmonic active power parameters include the effective value of the h-th harmonic voltage, the initial phase angle of the h-th harmonic voltage, the effective value of the h-th harmonic current, the initial phase angle of the h-th harmonic current, the effective value of the fundamental voltage, the effective value of the fundamental current and the phase difference between the fundamental voltage and the fundamental current.

3. The harmonic electric energy metering control system based on artificial intelligence according to claim 1 is characterized in that: The harmonic data preprocessing module preprocesses the collected data by performing noise reduction, outlier detection, and outlier processing on the data through existing filtering technology.

4. The harmonic electric energy metering control system based on artificial intelligence according to claim 1 is characterized in that: The calculation steps of the harmonic voltage error index are as follows: Step S01: Calculate the distortion voltage. The calculation model is as follows: ,in, Expressed as the distorted voltage at time t, It is expressed as the effective value of the harmonic voltage of order h, It is expressed as the initial phase angle of the hth harmonic voltage, N is the highest harmonic number in the waveform, and h is the hth harmonic. It is expressed as the fundamental angular frequency, and t is expressed as the time variable; Step S02: Calculate the voltage total harmonic distortion rate, the calculation model is as follows: ,in, , Expressed as the hth harmonic voltage content rate, It is expressed as the effective value of the harmonic voltage of order h, It is expressed as the effective value of the fundamental voltage, N is the highest harmonic order intercepted by the voltage, N≤50; Step S03: Calculate the harmonic voltage error index, and the calculation model is as follows: ,in, Expressed as harmonic voltage error index, Expressed as the distorted voltage at time t, It is represented by the preset standard distortion voltage at time t, Expressed as the total harmonic voltage effective value, It is expressed as the effective value of the harmonic voltage of order h, It is expressed as the effective value of the fundamental voltage, N is the highest harmonic order of the voltage interception, N≤50, Expressed as voltage total harmonic distortion, Indicates the preset upper limit of voltage total harmonic distortion rate.

5. The harmonic electric energy metering control system based on artificial intelligence according to claim 1 is characterized in that: The calculation steps of the harmonic current error index are as follows: Step S01: Calculate the distorted current. The calculation model is as follows: ,in, Expressed as the distorted current at time t, It is expressed as the effective value of harmonic current of order h, It is expressed as the initial phase angle of the hth harmonic current, N is the highest harmonic order in the waveform, and h is the hth harmonic. It is expressed as the fundamental angular frequency, and t is expressed as the time variable; Step S02: Calculate the total harmonic distortion of the current. The calculation model is as follows: ,in, , Expressed as the hth harmonic current content rate, It is expressed as the effective value of harmonic current of order h, It is expressed as the effective value of the fundamental current, N is expressed as the highest harmonic order intercepted by the current, N≤50; Step S03: Calculate the harmonic current error index, and the calculation model is as follows: ,in, Expressed as harmonic current error index, Expressed as the distorted current at time t, Expressed as the preset standard distortion current at time t, Expressed as the total harmonic current effective value, It is expressed as the effective value of harmonic current of order h, It is expressed as the effective value of the fundamental current, N is the highest harmonic order intercepted by the current, N≤50, Expressed as the total harmonic distortion of current, Indicates the preset upper limit of the total harmonic distortion rate of current.

6. The harmonic electric energy metering control system based on artificial intelligence according to claim 1 is characterized in that: The calculation steps of the harmonic active power error index are as follows: Step S01: Calculate the harmonic active power, the calculation model is as follows: ,in, It is expressed as harmonic active power, T is expressed as the period of AC voltage and AC current, It is expressed as the effective value of the harmonic voltage of order h, It is expressed as the initial phase angle of the hth harmonic voltage, It is expressed as the effective value of harmonic current of order h, It is expressed as the initial phase angle of the hth harmonic current, N is the highest harmonic order in the waveform, and h is the hth harmonic. It is expressed as the fundamental angular frequency, and t is expressed as the time variable; Step S02: Calculate the harmonic active power error index, and the calculation model is as follows: ,in, Expressed as harmonic active power error index, Expressed as harmonic active power, , Expressed as fundamental active power, Expressed as the effective value of the fundamental voltage, Expressed as the effective value of the fundamental current, Expressed as the phase difference between the fundamental voltage and the fundamental current.

7. The harmonic electric energy metering and control system based on artificial intelligence according to claim 1 is characterized in that: The specific method in which the harmonic data error analysis module compares the data transmitted by the harmonic power data analysis module with the preset value is: Extracting harmonic voltage error indicators , if the harmonic voltage error index Greater than the harmonic voltage error indicator threshold , it is judged that there is a measurement error in the harmonic voltage, and the abnormal result is sent to the operation and maintenance management personnel; otherwise, it indicates that there is no measurement error in the harmonic voltage; Extracting harmonic current error indicators , if the harmonic current error index Greater than the harmonic current error indicator threshold , it is judged that there is a measurement error in the harmonic current, and the abnormal result is sent to the operation and maintenance management personnel; otherwise, it indicates that there is no measurement error in the harmonic current; Extracting harmonic active power error indicators , if the harmonic active power error index Greater than the harmonic active power error indicator threshold , it is judged that there is a measurement error in the harmonic active power, and the abnormal result is sent to the operation and maintenance management personnel. Otherwise, it indicates that there is no measurement error in the harmonic active power.

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