Evaluation control method and system based on power grid operation stability

Abstract

The invention relates to the technical field of power grid safety guarantee, and particularly discloses an evaluation control method and system based on power grid operation stability, and the method comprises the steps: carrying out the region division of a power grid coverage region according to a preset mode, obtaining each power grid sub-region, obtaining the line control information of each power grid sub-region in each historical power grid operation control time period, analyzing to obtain a line operation stability control threshold value, acquiring environment information and line operation data of each power grid sub-region in the current power grid operation evaluation period, analyzing a line operation fluctuation evaluation value of each power grid sub-region, and matching a line operation stability required control value of each power grid sub-region; and comparing with a line operation stability control threshold value, so as to judge whether to regulate and control the line of each power grid sub-region, thereby enhancing the accuracy and timeliness of a power grid regulation and control decision, and improving the stability of power grid operation.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid security, and in particular to an evaluation and control method and system based on power grid operation stability. Background Art

[0002] With the development of the electric power industry, the scale of the power system continues to expand, the grid structure becomes increasingly complex, and the interconnection of large-scale power grids, cross-regional power transmission, and access to new energy sources pose more challenges to the stability of grid operation. In order to meet these challenges, it is necessary to develop more accurate and efficient grid operation stability assessment and control methods and systems to improve the operating efficiency and competitiveness of the grid, so as to ensure the safe and stable operation of the grid.

[0003] For example, the invention patent with announcement number CN115483698B announces a system and method for evaluating the operation stability of an AC / DC hybrid distribution network, which relates to the technical field of stability evaluation. The distribution network is subjected to stability analysis to determine whether the operation process of the distribution network is stable. At the same time, the operation status of the distribution network is detected in real time through the stability analysis of the distribution network; the initial operation of the distribution network is detected to determine the unstable operation stage of the distribution network.

[0004] For example, the invention patent with publication number CN117833209A discloses a method and system for optimizing the operating efficiency of a distribution network. By obtaining the evaluation index result data of the previous time window in the distribution network database, the control strategy of the previous time window, the distribution network synchronous measurement data of the current time window and the evaluation index setting value data, the node indicators and branch indicators of the entire distribution network are evaluated, and the obtained evaluation results are displayed in the human-machine interface and compared with the read evaluation index setting value data to determine whether the dynamic characteristics of the distribution network need to be optimized, determine the correlation between the dynamic characteristics of the entire network and each node and branch, find one or several locations that have the greatest impact on the quality of the dynamic characteristics of the entire network, convert the control strategy into a control command and send it to the corresponding additional controller to adjust its operating status.

[0005] Combined with the above technical solutions, it is found that in the current process of evaluating the stability of power grid operation, overall stability control and adjustment are usually carried out based on data. However, due to the strong overall correlation of the power grid, the overall adjustment of the power grid will reduce the overall operation efficiency of the power grid, further causing unstable operation of the power grid. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides an evaluation and control method and system based on power grid operation stability, which can effectively solve the problems involved in the above-mentioned background technology.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: The first aspect of the present invention provides an evaluation and control method based on the stability of power grid operation, including: S1. Dividing the power grid coverage area into regions according to a preset method to obtain each power grid sub-region, obtaining the line control information of each power grid sub-region in each historical power grid operation control period, and analyzing the line operation stability control threshold of each power grid sub-region in each historical power grid operation control period; S2. Obtaining the environmental information and line operation data of each power grid sub-region in the current power grid operation evaluation period, comprehensively analyzing the line operation fluctuation evaluation value of each power grid sub-region, and thereby matching the line operation stability control value of each power grid sub-region; S3. Comparing the line operation stability control value of each power grid sub-region with the line operation stability control threshold of each power grid sub-region in each historical power grid operation control period to obtain a line operation control comparison result, and determining whether to regulate the line of each power grid sub-region according to the line operation control comparison result.

[0008] As a further method, the line operation stability control threshold of each power grid sub-area in each historical power grid operation control period is specifically analyzed as follows: The line operating currents of each grid sub-area at the start control time point in each historical grid operation control period and the line operating currents of each grid sub-area at the end control time point in each historical grid operation control period are obtained and difference processing is performed one by one to obtain the line operating current control values ​​of each grid sub-area in each historical grid operation control period.

[0009] The average change rate of the line active power of each power grid sub-area in each historical power grid operation control period is specifically obtained by obtaining the line active power change curve of each power grid sub-area in each historical power grid operation control period, extracting the line active power corresponding to the highest position point and the line active power corresponding to the lowest position point, performing difference processing, and the difference result is recorded as the average change rate of the line active power of each power grid sub-area in each historical power grid operation control period.

[0010] The average value of the line active power of each power grid sub-area in each historical power grid operation control period is specifically obtained by extracting the line active power corresponding to each power change position point from the line active power change curve of each power grid sub-area in each historical power grid operation control period, and obtaining the average value of the line active power of each power grid sub-area in each historical power grid operation control period through mean processing.

[0011] The line power factor change of each power grid sub-area in each historical power grid operation control period is specifically to obtain the line active power and line apparent power belonging to the start control time point of each power grid sub-area in each historical power grid operation control period, and the line active power and line apparent power belonging to the end control time point of each power grid sub-area in each historical power grid operation control period, and perform ratio processing on the line active power and line apparent power belonging to the start control time point of each historical power grid operation control period of each power grid sub-area, and at the same time, perform ratio processing on the line active power and line apparent power belonging to the end control time point of each historical power grid operation control period of each power grid sub-area, and then perform difference processing on the result of the ratio of the two, and finally record it as the line power factor change of each power grid sub-area in each historical power grid operation control period.

[0012] Through the line operating current control value of each power grid sub-area in each historical power grid operation control period, the average change rate of the line active power of each power grid sub-area in each historical power grid operation control period, the average value of the line active power of each power grid sub-area in each historical power grid operation control period and the change of the line power factor of each power grid sub-area in each historical power grid operation control period, the line operation stability control threshold of each power grid sub-area in each historical power grid operation control period is comprehensively analyzed.

[0013] As a further method, the environmental information and line operation data of each power grid sub-area in the current power grid operation evaluation period are specifically processed as follows: The environmental information of each grid sub-area during the current grid operation evaluation period specifically includes the maximum ambient temperature, maximum ambient humidity, maximum line surface dirt thickness and maximum wind speed of each grid sub-area during the current grid operation evaluation period.

[0014] The line operation data specifically include the average change rate of line active power of each grid sub-area during the current grid operation evaluation period, the number of faults of the operating equipment belonging to the line, and the total number of parts replacement histories of the faulty operating equipment belonging to the line.

[0015] As a further method, the line operation fluctuation assessment value of each power grid sub-area is comprehensively analyzed, and the specific analysis process is as follows: The maximum ambient temperature, maximum ambient humidity, maximum line surface dirt thickness and maximum wind speed of each power grid sub-area during the current power grid operation evaluation period are comprehensively analyzed to obtain the line environmental impact index of each power grid sub-area during the current power grid operation evaluation period.

[0016] The line operation fluctuation assessment value of each grid sub-area is comprehensively analyzed through the average change rate of line active power in the current grid operation assessment period, the number of faults of the line operating equipment, the total number of parts replacement history of the faulty operating equipment belonging to the line, and the line environmental impact index of each grid sub-area in the current grid operation assessment period.

[0017] As a further method, the line environmental impact index of each power grid sub-area in the current power grid operation evaluation period is specifically obtained by: In the formula, It represents the line environmental impact index of the Nth grid sub-area during the current grid operation assessment period. Indicates the maximum ambient temperature of the Nth grid sub-area during the current grid operation evaluation period. Indicates the ambient temperature reference value preset by the power grid control library. Indicates the highest ambient humidity of the Nth grid sub-area during the current grid operation evaluation period, Indicates the ambient humidity reference value preset by the power grid control library. represents the maximum dirt thickness on the line surface of the Nth grid sub-area during the current grid operation evaluation period, Indicates the maximum wind speed of the Nth grid sub-area during the current grid operation evaluation period, represents the wind speed reference value preset by the power grid control library, e is a natural constant, Indicates the line environment correction factor of the maximum ambient temperature preset by the power grid control library, Indicates the line environment correction factor of the maximum ambient humidity preset by the power grid control library, The line environmental impact factor representing the maximum dirt thickness on the line surface preset by the power grid control library, It represents the line environment correction factor of the maximum wind speed preset in the power grid control library. N is the number of each power grid sub-area. R, R is the total number of power grid sub-areas.

[0018] As a further method, the control value required for stable operation of the line in each power grid sub-area is matched, and the specific matching process is: The line operation fluctuation assessment value of each power grid sub-area is matched with the line operation stability control value corresponding to each line operation fluctuation assessment value interval preset in the power grid control library, thereby obtaining the line operation stability control value of each power grid sub-area.

[0019] As a further method, the line operation control comparison result is specifically to compare the line operation stability control value of a certain power grid sub-area with the line operation stability control threshold of the corresponding power grid sub-area in each historical power grid operation control period. If the line operation stability control value is greater than or equal to the line operation stability control threshold in a certain historical power grid operation control period, it is necessary to regulate the line in the power grid sub-area; if the line operation stability control values ​​are all less than the line operation stability control threshold in each historical power grid operation control period, it is not necessary to regulate the line in the power grid sub-area.

[0020] As a further method, the line of the power grid sub-area is regulated and controlled, specifically, the line operation stability control value of the power grid sub-area is difference processed with the line operation stability control threshold of the corresponding power grid sub-area in each historical power grid operation control period, and the difference processing result is recorded as the line operation control deviation value of the power grid sub-area in each historical power grid operation control period, thereby sorting them in order from small to large, extracting the historical power grid operation control period of the power grid sub-area corresponding to the line operation control deviation value ranked first, and finally obtaining the power grid line operation control plan corresponding to the historical power grid operation control period of the power grid sub-area, thereby the power grid sub-area regulates the line through the power grid line operation control plan.

[0021] The second aspect of the present invention provides an evaluation and control system based on the stability of power grid operation, including: a line stability threshold evaluation module, which is used to divide the power grid coverage area into regions according to a preset method, obtain each power grid sub-region, obtain the line control information of each power grid sub-region in each historical power grid operation control period, and analyze the line operation stability control threshold of each power grid sub-region in each historical power grid operation control period.

[0022] The line fluctuation value assessment module is used to obtain the environmental information and line operation data of each power grid sub-area during the current power grid operation assessment period, and comprehensively analyze the line operation fluctuation assessment value of each power grid sub-area, thereby matching the line operation stability control value of each power grid sub-area.

[0023] The line regulation and judgment module is used to compare the line operation stability control value required for each power grid sub-area with the line operation stability control threshold of each power grid sub-area in each historical power grid operation control period, obtain the line operation control comparison result, and determine whether to regulate the line in each power grid sub-area based on the line operation control comparison result.

[0024] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects: (1) The present invention provides an evaluation and control method and system based on the stability of power grid operation. First, the power grid coverage area is divided into regions according to a preset method to obtain each power grid sub-region, and the line control information of each power grid sub-region in each historical power grid operation control period is obtained. The line operation stability control threshold of each power grid sub-region in each historical power grid operation control period is analyzed. Then, the environmental information and line operation data of each power grid sub-region in the current power grid operation evaluation period are obtained, and the line operation fluctuation evaluation value of each power grid sub-region is comprehensively analyzed. The line operation stability control value required for each power grid sub-region is matched, and then the line operation stability control value required for each power grid sub-region is compared with the line operation stability control threshold of each power grid sub-region in each historical power grid operation control period to obtain a line operation control comparison result, and it is determined whether to regulate the line in each power grid sub-region according to the line operation control comparison result. The line regulation method herein is highly targeted and can accurately identify and solve specific problems in the power grid, thereby improving the reliability and safety of the power grid.

[0025] (2) The present invention provides an evaluation and control method and system based on the stability of power grid operation, divides the power grid coverage area into regions according to a preset method, obtains each power grid sub-region, obtains the line control information of each power grid sub-region in each historical power grid operation control period, and analyzes the line operation stability control threshold of each power grid sub-region in each historical power grid operation control period. Through more refined data analysis, targeted adjustments can be made to specific problem areas in the power grid, thereby improving the efficiency and accuracy of regulation.

[0026] (3) The present invention provides an evaluation and control method and system based on the grid operation stability, obtains the environmental information and line operation data of each grid sub-area during the current grid operation evaluation period, and comprehensively analyzes the line operation fluctuation evaluation value of each grid sub-area, thereby matching the line operation stability control value of each grid sub-area. It comprehensively considers the multi-dimensional line fluctuation influencing factors, can more comprehensively reflect the actual situation of the line, improves the accuracy of line regulation, and enhances the stability of the grid.

[0027] (4) The present invention provides an evaluation and control method and system based on the stability of power grid operation, compares the line operation stability control value of each power grid sub-area with the line operation stability control threshold of each power grid sub-area in each historical power grid operation control period, obtains the line operation control comparison result, and determines whether to regulate the line of each power grid sub-area according to the line operation control comparison result, so as to accurately and timely perform regulation, thereby ensuring the stable operation of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the present invention. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0029] Figure 1 The figure is a schematic flow chart of the method steps of the present invention.

[0030] Figure 2 It is a schematic diagram of system module connection of the present invention.

[0031] Figure 3 This is the line active power variation curve involved in the present invention.

[0032] Figure numerals: 1, highest position point; 2, lowest position point; 3, power change position point. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] Reference Figure 1 As shown, the first aspect of the present invention provides an evaluation and control method based on power grid operation stability, including: S1. Dividing the power grid coverage area into regions according to a preset method to obtain each power grid sub-region, obtaining the line control information of each power grid sub-region in each historical power grid operation control period, and analyzing the line operation stability control threshold of each power grid sub-region in each historical power grid operation control period.

[0035] In this embodiment, the grid coverage area is divided into regions according to a preset method to obtain grid sub-regions, which specifically refers to equal area division according to the area. For example, if the grid coverage area is 100 square meters, it is divided into four grid sub-regions with equal areas of 25 square meters per grid sub-region.

[0036] It should be explained that the above-mentioned historical power grid operation control time periods specifically refer to the time period from the beginning of each regulation of the power grid line to the end of the regulation, which is recorded as each historical power grid operation control time period. The specific duration will vary depending on factors such as the difficulty of regulation, the location of the line to be regulated, and the needs of power grid operation control and monitoring.

[0037] Specifically, the line control information of each power grid sub-area in each historical power grid operation control period includes the average change rate of the line active power of each power grid sub-area in each historical power grid operation control period, the average value of the line active power of each power grid sub-area in each historical power grid operation control period, and the change of the line power factor of each power grid sub-area in each historical power grid operation control period.

[0038] Furthermore, the line operation stability control threshold of each power grid sub-area in each historical power grid operation control period is specifically analyzed as follows: The line operating currents of each grid sub-area at the start control time point in each historical grid operation control period and the line operating currents of each grid sub-area at the end control time point in each historical grid operation control period are obtained and difference processing is performed one by one to obtain the line operating current control values ​​of each grid sub-area in each historical grid operation control period.

[0039] It should be explained that the operating current of the lines belonging to the start control time points of the above-mentioned each grid sub-area in each historical grid operation control period and the operating current of the lines belonging to the end control time points of each grid sub-area in each historical grid operation control period can be obtained by real-time monitoring of the current in the grid lines by power monitoring instruments connected to the lines of each grid sub-area; the start control time point is specifically the time point when the grid operation control of each grid sub-area is started, and the end control time point is specifically the time point when the grid operation control of each grid sub-area is ended.

[0040] The average change rate of the line active power of each power grid sub-area in each historical power grid operation control period is specifically obtained by obtaining the line active power change curve of each power grid sub-area in each historical power grid operation control period, extracting the line active power corresponding to the highest position point and the line active power corresponding to the lowest position point, performing difference processing, and the difference result is recorded as the average change rate of the line active power of each power grid sub-area in each historical power grid operation control period.

[0041] It should be explained that the active power change curves of the lines in the above-mentioned each power grid sub-area in each historical power grid operation control period can be obtained by the built-in calculation module of the power monitoring instrument connected to the lines of each power grid sub-area to obtain the active power data, and by setting the sampling frequency and data recording function, the continuous change data of the active power of the lines in each power grid sub-area in each historical power grid operation control period can be obtained, and then the line active power change curves can be drawn.

[0042] according to Figure 3As shown, this is a line active power change curve of a certain power grid sub-area in a certain historical power grid operation control period. It can be seen from the figure that the horizontal axis is the power control time point, the unit is second, and the vertical axis is the active power, the unit is watt; the highest position point 1 and the lowest position point 2 of the line active power change curve in the figure correspond to the line active power respectively, and the difference processing is performed to obtain the average change rate of the line active power.

[0043] The average value of the line active power of each power grid sub-area in each historical power grid operation control period is specifically obtained by extracting the line active power corresponding to each power change position point from the line active power change curve of each power grid sub-area in each historical power grid operation control period, and obtaining the average value of the line active power of each power grid sub-area in each historical power grid operation control period through mean processing.

[0044] according to Figure 3 As shown, each power change position point is a number of power change position points 3 randomly arranged in the line active power change curve, and the line active power corresponding to each power change position point is obtained from the line active power change curve, and the average value of the line active power is obtained by mean processing.

[0045] The line power factor change of each power grid sub-area in each historical power grid operation control period is specifically to obtain the line active power and line apparent power belonging to the start control time point of each power grid sub-area in each historical power grid operation control period, and the line active power and line apparent power belonging to the end control time point of each power grid sub-area in each historical power grid operation control period, and perform ratio processing on the line active power and line apparent power belonging to the start control time point of each historical power grid operation control period of each power grid sub-area, and at the same time, perform ratio processing on the line active power and line apparent power belonging to the end control time point of each historical power grid operation control period of each power grid sub-area, and then perform difference processing on the result of the ratio of the two, and finally record it as the line power factor change of each power grid sub-area in each historical power grid operation control period.

[0046] It needs to be explained that the active power and apparent power of the lines belonging to the above-mentioned each grid sub-area at the start control time point of each historical grid operation control period, and the active power and apparent power of the lines belonging to each grid sub-area at the end control time point of each historical grid operation control period can all be obtained from the continuous change data of the active power of the lines in each grid sub-area in each historical grid operation control period by setting the sampling frequency and data recording function through the power monitoring instrument connected to the lines of each grid sub-area.

[0047] Through the line operation current control value of each power grid sub-area in each historical power grid operation control period, the average change rate of the line active power of each power grid sub-area in each historical power grid operation control period, the average value of the line active power of each power grid sub-area in each historical power grid operation control period, and the change of the line power factor of each power grid sub-area in each historical power grid operation control period, the line operation stability control threshold of each power grid sub-area in each historical power grid operation control period is comprehensively analyzed. The specific acquisition method is: ; In the formula, It represents the line operating current control value of the Nth grid sub-area in the Tth historical grid operation control period, specifically refers to the difference between the line operating current of the Nth grid sub-area at the start control time point in the Tth historical grid operation control period and the line operating current of the Nth grid sub-area at the end control time point in the Tth historical grid operation control period.

[0048] It represents the average change rate of the line active power of the Nth grid sub-area during the Tth historical grid operation control period. Specifically, it refers to the difference between the maximum line active power and the minimum line active power of the Nth grid sub-area during the Tth historical grid operation control period, reflecting the fluctuation of the line active power.

[0049] It represents the average value of the line active power of the Nth grid sub-area during the Tth historical grid operation control period. Specifically, it refers to the average rate of change of the line active power of the Nth grid sub-area over time during the Tth historical grid operation control period, reflecting the average speed of change of the line active power over time.

[0050] It indicates the change of line power factor of the Nth grid sub-area during the Tth historical grid operation control period. Specifically, it refers to the change of line power factor (i.e. the ratio of active power to apparent power) of the Nth grid sub-area during the Tth historical grid operation control period from the start of control to the end of control, which reflects the effective utilization of electric energy in the grid.

[0051] The line stability control influence coefficient representing the line operating current control value preset by the power grid control library represents the numerical value of the influence degree of the line operating current control value preset by the power grid control library on the line operation stability control threshold. When used, the line stability control influence coefficient corresponding to the line operating current control value can be directly obtained from the power grid control library, and the corresponding relationship can be a preset mapping relationship. For example, the line operating current control value and the line stability control influence coefficient of the line operating current control value preset by the power grid control library form a mapping set, and the real-time line operating current control value is input into the mapping set to obtain the line stability control influence coefficient of the line operating current control value. The mapping relationship can be one-to-one or many-to-one. In this example, its value range is [0, 1].

[0052] The line stability control influence coefficient of the line active power average change rate preset in the power grid control library is represented, and the numerical value representing the influence degree of the line active power average change rate preset in the power grid control library on the line operation stability control threshold value is represented. When used, the line stability control influence coefficient corresponding to the line active power average change rate can be directly obtained from the power grid control library, and the corresponding relationship can be a preset mapping relationship. For example, the line active power average change rate and the line stability control influence coefficient of the line active power average change rate preset in the power grid control library form a mapping set, and the real-time line active power average change rate is input into the mapping set to obtain the line stability control influence coefficient of the line active power average change rate. The mapping relationship can be one-to-one or many-to-one. In this example, its value range is [0, 1].

[0053] The line stability control influence coefficient representing the average value of the line active power preset in the power grid control library represents the numerical value of the influence degree of the average value of the line active power preset in the power grid control library on the line operation stability control threshold. When used, the line stability control influence coefficient corresponding to the average value of the line active power can be directly obtained from the power grid control library. The corresponding relationship can be a preset mapping relationship. For example, the line active power average value and the line stability control influence coefficient of the line active power average value preset in the power grid control library form a mapping set. The real-time line active power average value is input into the mapping set to obtain the line stability control influence coefficient of the line active power average value. The mapping relationship can be one-to-one or many-to-one. In this example, its value range is [0, 1].

[0054] The line stability control influence coefficient representing the line power factor change preset in the power grid control library represents the numerical value of the influence degree of the line power factor change preset in the power grid control library on the line operation stability control threshold. When used, the line stability control influence coefficient corresponding to the line power factor change can be directly obtained from the power grid control library, and the corresponding relationship can be a preset mapping relationship. For example, the line power factor change and the line stability control influence coefficient of the line power factor change preset in the power grid control library form a mapping set, and the real-time line power factor change is input into the mapping set to obtain the line stability control influence coefficient of the line power factor change. The mapping relationship can be one-to-one or many-to-one. In this example, its value range is [0, 1].

[0055] N is the number of each power grid sub-area, R, R is the total number of power grid sub-areas, T is the number of each historical power grid operation control period, Q, Q is the total number of historical power grid operation control periods.

[0056] It represents the line operation stability control threshold of the Nth grid sub-area in the Tth historical grid operation control period. Specifically, in the process of evaluating the line operation stability control situation of the Nth grid sub-area in the Tth historical grid operation control period, when the line operation current control value increases, the active power of the line will also increase accordingly, and the average change rate of the line active power will increase accordingly, which will cause the change of the line power factor to increase, and may also increase the average value of the line active power, which will cause a sharp change in the load in the power grid. Greater regulation is required to return the power grid line to a stable operation state, thereby increasing the line operation stability control threshold.

[0057] S2. Obtain the environmental information and line operation data of each power grid sub-area during the current power grid operation evaluation period, comprehensively analyze the line operation fluctuation evaluation value of each power grid sub-area, and thereby match the line operation stability control value of each power grid sub-area.

[0058] It should be explained that the above-mentioned current power grid operation evaluation period specifically refers to the time period from the beginning of the operation evaluation of the power grid sub-area to the end of the evaluation, which is recorded as the current power grid operation evaluation period. This time period and the above-mentioned historical power grid operation control period are the same time period, such as 5 o'clock to 10 o'clock.

[0059] Specifically, the environmental information and line operation data of each power grid sub-area in the current power grid operation evaluation period are as follows: The environmental information of each grid sub-area during the current grid operation evaluation period specifically includes the maximum ambient temperature, maximum ambient humidity, maximum line surface dirt thickness and maximum wind speed of each grid sub-area during the current grid operation evaluation period.

[0060] It should be explained that the maximum ambient temperature of each of the above-mentioned power grid sub-areas during the current power grid operation evaluation period can be obtained by using a high-sensitivity temperature sensor built into the power grid sub-area, wherein the temperature sensor can monitor multiple ambient temperature values ​​during the current power grid operation evaluation period in real time, and screen out the maximum value as the maximum ambient temperature by comparing the values; the maximum ambient humidity of each of the above-mentioned power grid sub-areas during the current power grid operation evaluation period can be obtained by using a high-sensitivity humidity sensor built into the power grid sub-area, wherein the humidity sensor can monitor multiple ambient humidity values ​​during the current power grid operation evaluation period in real time, and screen out the maximum value as the maximum ambient humidity by comparing the values; the maximum ambient humidity of each of the above-mentioned power grid sub-areas during the current power grid operation evaluation period can be obtained by using a high-sensitivity humidity sensor built into the power grid sub-area, The maximum dirt thickness on the line surface in the current power grid operation evaluation period can be obtained by using the insulator contamination online monitoring device built into the power grid sub-area, wherein the insulator contamination online monitoring device can monitor multiple line surface dirt thickness values ​​in the current power grid operation evaluation period in real time, and screen out the maximum value as the maximum line surface dirt thickness by comparing the values; the maximum wind speed of each of the above-mentioned power grid sub-areas in the current power grid operation evaluation period can be obtained by using the high-sensitivity ultrasonic anemometer built into the power grid sub-area, wherein the ultrasonic anemometer can monitor multiple wind speed values ​​in the current power grid operation evaluation period in real time, and screen out the maximum value as the maximum wind speed by comparing the values.

[0061] The line operation data specifically include the average change rate of line active power of each grid sub-area during the current grid operation evaluation period, the number of faults of the operating equipment belonging to the line, and the total number of parts replacement histories of the faulty operating equipment belonging to the line.

[0062] It should be explained that the average change rate of the line active power of each of the above-mentioned power grid sub-areas in the current power grid operation evaluation period and the average change rate of the line active power of each of the above-mentioned power grid sub-areas in each historical power grid operation control period are obtained in the same way; the number of failures of the operating equipment belonging to the lines in the current power grid operation evaluation period of each of the above-mentioned power grid sub-areas and the total number of parts replacement history of the faulty operating equipment belonging to the lines can be obtained through the equipment failure record report.

[0063] Specifically, the comprehensive analysis is performed to obtain the line operation fluctuation assessment value of each power grid sub-area, and the specific analysis process is as follows: The maximum ambient temperature, maximum ambient humidity, maximum line surface dirt thickness and maximum wind speed of each power grid sub-area during the current power grid operation evaluation period are comprehensively analyzed to obtain the line environmental impact index of each power grid sub-area during the current power grid operation evaluation period.

[0064] The line operation fluctuation assessment value of each grid sub-area is comprehensively analyzed through the average change rate of line active power in the current grid operation assessment period, the number of faults of the line-owned operating equipment, the total number of parts replacement history of the faulty operating equipment in the line, and the line environmental impact index of each grid sub-area in the current grid operation assessment period. The specific acquisition method is as follows: In the formula, It represents the average change rate of the line active power of the Nth grid sub-area during the current grid operation evaluation period. Specifically, it refers to the difference between the maximum active power and the minimum active power of the line in the Nth grid sub-area during the current grid operation evaluation period, reflecting the fluctuation of the line active power.

[0065] It indicates the number of faulty operating equipment belonging to the lines in the Nth power grid sub-area during the current power grid operation evaluation period, specifically refers to the number of faulty operating equipment belonging to the lines in the Nth power grid sub-area during the current power grid operation evaluation period.

[0066] It indicates the total number of parts replaced in history for faulty equipment belonging to the lines in the Nth grid sub-area during the current grid operation assessment period. Specifically, it refers to the total number of parts that have been replaced in history for equipment that has abnormally operated due to faults in the lines in the Nth grid sub-area during the current grid operation assessment period.

[0067] It represents the line environmental impact index of the Nth grid sub-area during the current grid operation evaluation period. Specifically, it is obtained through comprehensive analysis of the maximum ambient temperature, maximum ambient humidity, maximum dirt thickness on the line surface and maximum wind speed of each grid sub-area during the current grid operation evaluation period during the process of evaluating the line environmental impact status of the Nth grid sub-area during the current grid operation evaluation period.

[0068] The line fluctuation assessment impact weight representing the line active power average change rate preset in the power grid control library represents the numerical value of the influence degree of the line active power average change rate preset in the power grid control library on the line operation fluctuation assessment value. When used, the line fluctuation assessment impact weight corresponding to the line active power average change rate can be directly obtained from the power grid control library. The corresponding relationship can be a pre-set mapping relationship. For example, the line active power average change rate and the line fluctuation assessment impact weight of the line active power average change rate preset in the power grid control library form a mapping set. The real-time line active power average change rate is input into the mapping set to obtain the line fluctuation assessment impact weight of the line active power average change rate. The mapping relationship can be one-to-one or many-to-one. In this example, its value range is [0, 1].

[0069] The line fluctuation assessment impact weight representing the number of faults of the line-owned operating equipment preset in the power grid control library represents the numerical value of the degree of influence of the number of faults of the line-owned operating equipment preset in the power grid control library on the line operation fluctuation assessment value. When used, the line fluctuation assessment impact weight corresponding to the number of faults of the line-owned operating equipment can be directly obtained from the power grid control library, and the corresponding relationship can be a preset mapping relationship. For example, the number of faults of the line-owned operating equipment and the line fluctuation assessment impact weight of the number of faults of the line-owned operating equipment preset in the power grid control library form a mapping set, and the real-time number of faults of the line-owned operating equipment is input into the mapping set to obtain the line fluctuation assessment impact weight of the number of faults of the line-owned operating equipment. The mapping relationship can be one-to-one or many-to-one. In this example, its value range is [0, 1].

[0070] The line fluctuation assessment impact weight representing the total number of parts replacement histories of faulty operating equipment belonging to the line preset in the power grid control library, represents the numerical value of the degree of influence of the total number of parts replacement histories of faulty operating equipment belonging to the line preset in the power grid control library on the line operation fluctuation assessment value. When used, the line fluctuation assessment impact weight corresponding to the total number of parts replacement histories of faulty operating equipment belonging to the line can be directly obtained from the power grid control library, and the corresponding relationship can be a preset mapping relationship. For example, the total number of parts replacement histories of faulty operating equipment belonging to the line and the line fluctuation assessment impact weight of the total number of parts replacement histories of faulty operating equipment belonging to the line preset in the power grid control library form a mapping set, and the real-time total number of parts replacement histories of faulty operating equipment belonging to the line is input into the mapping set to obtain the line fluctuation assessment impact weight of the total number of parts replacement histories of faulty operating equipment belonging to the line. The mapping relationship can be one-to-one or many-to-one. In this example, its value range is [0, 1].

[0071] The line fluctuation assessment impact weight of the line environmental impact index preset in the power grid control library is represented, and the numerical value of the influence degree of the line environmental impact index preset in the power grid control library on the line operation fluctuation assessment value is represented. When used, the line fluctuation assessment impact weight corresponding to the line environmental impact index can be directly obtained from the power grid control library, and the corresponding relationship can be a preset mapping relationship. For example, the line environmental impact index and the line fluctuation assessment impact weight of the line environmental impact index preset in the power grid control library form a mapping set, and the real-time line environmental impact index is input into the mapping set to obtain the line fluctuation assessment impact weight of the line environmental impact index. The mapping relationship can be one-to-one or many-to-one. In this example, its value range is [0, 1], N is the number of each power grid sub-area, R, R is the total number of power grid sub-areas.

[0072] It represents the line operation fluctuation assessment value of the Nth grid sub-area in the current grid operation assessment period. Specifically, in the process of evaluating the line operation fluctuation of the Nth grid sub-area in the current grid operation assessment period, the average change rate of the line active power is large, indicating that the line operation volatility is large, which may lead to an increase in the equipment failure rate, and then increase the frequency of parts replacement, so that the number of failures of the line operating equipment and the total number of parts replacement histories of the faulty operating equipment belonging to the line are increased. The increase in the number of parts replacements means that the equipment is aging or improperly maintained, resulting in unstable line operation and an increase in the line operation fluctuation assessment value. The increase in the line environmental impact index indicates that the environmental conditions are severe. The severe environmental conditions may increase the risk of line failures, which will lead to an increase in the number of failures of the line operating equipment and the total number of parts replacement histories of the faulty operating equipment belonging to the line, thereby affecting the operation stability of the line and ultimately leading to an increase in the line operation fluctuation assessment value.

[0073] Furthermore, the line environmental impact index of each power grid sub-area in the current power grid operation evaluation period is specifically obtained by: In the formula, It represents the highest ambient temperature of the Nth grid sub-area during the current grid operation evaluation period, specifically refers to the maximum ambient temperature of the Nth grid sub-area during the current grid operation evaluation period.

[0074] It indicates the ambient temperature reference value preset by the power grid control library, specifically, the optimal ambient temperature value for stable line operation in the Nth power grid sub-area during the current power grid operation evaluation period.

[0075] It indicates the highest ambient humidity of the Nth grid sub-area during the current grid operation evaluation period, specifically refers to the maximum ambient humidity of the Nth grid sub-area during the current grid operation evaluation period.

[0076] It indicates the ambient humidity reference value preset by the power grid control library, specifically, the optimal ambient humidity value for stable line operation in the Nth power grid sub-area during the current power grid operation evaluation period.

[0077] It indicates the maximum dirt thickness on the line surface of the Nth grid sub-area during the current grid operation evaluation period, specifically refers to the maximum value of the dirt thickness on the line surface of the Nth grid sub-area during the current grid operation evaluation period.

[0078] It represents the maximum wind speed of the Nth grid sub-area during the current grid operation evaluation period, specifically refers to the maximum wind speed of the Nth grid sub-area during the current grid operation evaluation period.

[0079] It indicates the wind speed reference value preset in the power grid control library, specifically, the optimal wind speed value for stable line operation in the Nth power grid sub-area during the current power grid operation evaluation period.

[0080] e is a natural constant, The line environment correction factor representing the maximum ambient temperature preset in the power grid control library represents the numerical value of the influence degree of the maximum ambient temperature preset in the power grid control library on the line environment impact index. When used, the line environment correction factor corresponding to the maximum ambient temperature can be directly obtained from the power grid control library, and the corresponding relationship can be a preset mapping relationship. For example, the maximum ambient temperature and the line environment correction factor of the maximum ambient temperature preset in the power grid control library form a mapping set, and the real-time maximum ambient temperature is input into the mapping set to obtain the line environment correction factor of the maximum ambient temperature. The mapping relationship can be one-to-one or many-to-one. In this example, its value range is [0, 1].

[0081] The line environment correction factor representing the maximum ambient humidity preset in the power grid control library represents the numerical value of the influence degree of the maximum ambient humidity preset in the power grid control library on the line environment impact index. When used, the line environment correction factor corresponding to the maximum ambient humidity can be directly obtained from the power grid control library, and the corresponding relationship can be a preset mapping relationship. For example, the maximum ambient humidity and the line environment correction factor of the maximum ambient humidity preset in the power grid control library form a mapping set, and the real-time maximum ambient humidity is input into the mapping set to obtain the line environment correction factor of the maximum ambient humidity. The mapping relationship can be one-to-one or many-to-one. In this example, its value range is [0, 1].

[0082] The line environmental impact factor representing the maximum dirt thickness on the line surface preset by the power grid control library represents the numerical value of the influence degree of the maximum dirt thickness on the line surface preset by the power grid control library on the line environmental impact index. When used, the line environmental impact factor corresponding to the maximum dirt thickness on the line surface can be directly obtained from the power grid control library, and the corresponding relationship can be a preset mapping relationship. For example, the maximum dirt thickness on the line surface and the line environmental impact factor of the maximum dirt thickness on the line surface preset by the power grid control library form a mapping set, and the real-time maximum dirt thickness on the line surface is input into the mapping set to obtain the line environmental impact factor of the maximum dirt thickness on the line surface. The mapping relationship can be one-to-one or many-to-one. In this example, its value range is [0, 1].

[0083] The line environment correction factor representing the maximum wind speed preset in the power grid control library represents the numerical value of the influence degree of the maximum wind speed preset in the power grid control library on the line environment impact index. When used, the line environment correction factor corresponding to the maximum wind speed can be directly obtained from the power grid control library, and the corresponding relationship can be a preset mapping relationship. For example, the maximum wind speed and the line environment correction factor of the maximum wind speed preset in the power grid control library form a mapping set, and the real-time maximum wind speed is input into the mapping set to obtain the line environment correction factor of the maximum wind speed. The mapping relationship can be one-to-one or many-to-one. In this example, its value range is [0, 1].

[0084] N is the number of each power grid sub-area, R, R is the total number of power grid sub-areas, It represents the line environmental impact index of the Nth grid sub-area in the current grid operation evaluation period. Specifically, in the process of evaluating the line environmental impact status of the Nth grid sub-area in the current grid operation evaluation period, when the temperature is too high, that is, deviating from the temperature reference value, the humidity value in the air will decrease. If the deviation between the humidity and the humidity reference value is large, it will make it easier for dust to float in the air, which will increase the maximum dirt thickness on the line surface. The accumulation of dirt will affect the heat dissipation and insulation performance of the line, which will increase the line environmental impact index. When the temperature is too low, that is, deviating from the temperature reference value, the humidity value in the air will increase. If the deviation between humidity and humidity reference value is large, dust will be more easily attached to the line surface, which will increase the maximum dirt thickness on the line surface. At the same time, low temperature may also cause ice on the line surface, affecting the heat dissipation and insulation performance of the line, thereby increasing the line environmental impact index. When the wind speed is too high, that is, it deviates from the wind speed reference value, it will cause the line to vibrate, reduce the mechanical stability and heat dissipation performance of the line, thereby increasing the line environmental impact index. When the wind speed is too low, that is, it deviates from the wind speed reference value, it will make it impossible to blow away the dirt attached to the line surface, which will increase the maximum dirt thickness on the line surface, and ultimately increase the line environmental impact index.

[0085] Furthermore, the control value required for stable operation of the line in each power grid sub-area is matched, and the specific matching process is: The line operation fluctuation assessment value of each power grid sub-area is matched with the line operation stability control value corresponding to each line operation fluctuation assessment value interval preset in the power grid control library, thereby obtaining the line operation stability control value of each power grid sub-area.

[0086] The above-mentioned line operation stability of each power grid sub-area requires control values, and the specific matching process is as follows: The above-mentioned line operation fluctuation assessment values ​​and the corresponding line operation stability control values ​​are formulated by authoritative line monitoring agencies or standardization organizations through data collection, collation, and encryption processing. Each line operation fluctuation assessment value is carefully divided, and the corresponding line operation stability control value is designed for each line operation fluctuation assessment value range based on power grid security standards, threat and risk analysis, and business needs and compliance requirements.

[0087] For example, if the line operation fluctuation assessment value in this example is 3, it belongs to the line operation fluctuation assessment value interval corresponding to [3, 5]. At the same time, the line operation stability control value corresponding to the line operation fluctuation assessment value interval of [3, 5] preset in the power grid control library is 66.

[0088] S3. Compare the line operation stability control value required for each power grid sub-area with the line operation stability control threshold of each power grid sub-area in each historical power grid operation control period to obtain the line operation control comparison result, and determine whether to regulate the line in each power grid sub-area based on the line operation control comparison result.

[0089] Specifically, the line operation control comparison result is to compare the line operation stability control value of a certain power grid sub-area with the line operation stability control threshold of the corresponding power grid sub-area in each historical power grid operation control period. If the line operation stability control value is greater than or equal to the line operation stability control threshold in a certain historical power grid operation control period, it is necessary to regulate the line in the power grid sub-area; if the line operation stability control values ​​are all less than the line operation stability control threshold in each historical power grid operation control period, it is not necessary to regulate the line in the power grid sub-area.

[0090] It should be explained that if the above-mentioned line operation stability control value is greater than or equal to the line operation stability control threshold value within a certain historical power grid operation control period, it means that the line operation in this power grid sub-area is unstable and there are fluctuations, and it is necessary to regulate the lines in this power grid sub-area; if the line operation stability control values ​​are all less than the line operation stability control threshold value within each historical power grid operation control period, it means that the line operation in this power grid sub-area is stable and there is no need to regulate the lines in this power grid sub-area.

[0091] Furthermore, the line control of the power grid sub-area is specifically to perform difference processing on the line operation stability control value of the power grid sub-area and the line operation stability control threshold of the corresponding power grid sub-area in each historical power grid operation control period, and record the difference processing result as the line operation control deviation value of the power grid sub-area in each historical power grid operation control period, thereby sorting them in order from small to large, extracting the historical power grid operation control period of the power grid sub-area corresponding to the line operation control deviation value ranked first, and finally obtaining the power grid line operation control plan corresponding to the historical power grid operation control period of the power grid sub-area, thereby the power grid sub-area controls the line through the power grid line operation control plan.

[0092] It should be explained that the grid line operation control plan corresponding to the historical grid operation control period of the above-mentioned grid sub-area can be obtained through the grid dispatching plan formulated by the grid dispatching center; the above-mentioned line is regulated by the grid line operation control plan, and the specific regulation process is to increase the output power of the generator set in the grid sub-area and increase the transmission power of the DC transmission line.

[0093] Reference Figure 2As shown, the second aspect of the present invention provides an evaluation control system based on power grid operation stability, including: a line stability threshold evaluation module, a line fluctuation value evaluation module, a line regulation and determination module and a power grid control library.

[0094] The line stability threshold evaluation module is connected to the line fluctuation value evaluation module, the line fluctuation value evaluation module is connected to the line regulation and determination module, and the line stability threshold evaluation module, the line fluctuation value evaluation module and the line regulation and determination module are all connected to the power grid control library.

[0095] The line stability threshold evaluation module is used to divide the power grid coverage area into regions according to a preset method, obtain each power grid sub-region, obtain the line control information of each power grid sub-region in each historical power grid operation control period, and analyze the line operation stability control threshold of each power grid sub-region in each historical power grid operation control period.

[0096] The line fluctuation value assessment module is used to obtain the environmental information and line operation data of each power grid sub-area during the current power grid operation assessment period, and comprehensively analyze the line operation fluctuation assessment value of each power grid sub-area, thereby matching the line operation stability control value of each power grid sub-area.

[0097] The line regulation and determination module is used to compare the line operation stability control value required for each power grid sub-area with the line operation stability control threshold of each power grid sub-area in each historical power grid operation control period to obtain a line operation control comparison result, and determine whether to regulate the line in each power grid sub-area based on the line operation control comparison result.

[0098] The power grid control library is used to store the line stability control influence coefficient of the line operating current control value, the line stability control influence coefficient of the average change rate of the line active power, the line stability control influence coefficient of the average value of the line active power, the line stability control influence coefficient of the line power factor change, the ambient temperature reference value, the ambient humidity reference value, the wind speed reference value, the line environment correction factor of the maximum ambient temperature, the line environment correction factor of the maximum ambient humidity, the line environment impact factor of the maximum dirt thickness on the line surface, the line environment correction factor of the maximum wind speed, the line fluctuation assessment influence weight of the average change rate of the line active power, the line fluctuation assessment influence weight of the number of failures of the operating equipment belonging to the line, the line fluctuation assessment influence weight of the total number of parts replacement history of the faulty operating equipment belonging to the line, and the line fluctuation assessment influence weight of the line environment impact index.

[0099] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the present invention, they should all fall within the protection scope of the present invention.

Claims

1. An evaluation and control method based on power grid operation stability, characterized in that: include: S1. Divide the grid coverage area into regions according to a preset method to obtain each grid sub-region, obtain the line control information of each grid sub-region in each historical grid operation control period, and analyze the line operation stability control threshold of each grid sub-region in each historical grid operation control period; S2. Obtain environmental information and line operation data of each grid sub-area during the current grid operation evaluation period, comprehensively analyze the line operation fluctuation evaluation value of each grid sub-area, and thereby match the line operation stability control value of each grid sub-area; S3. Compare the line operation stability control value required for each power grid sub-area with the line operation stability control threshold of each power grid sub-area in each historical power grid operation control period to obtain the line operation control comparison result, and determine whether to regulate the line in each power grid sub-area based on the line operation control comparison result.

2. The evaluation and control method based on power grid operation stability according to claim 1 is characterized in that: The line control information of each power grid sub-area in each historical power grid operation control period specifically includes the average change rate of the line active power of each power grid sub-area in each historical power grid operation control period, the average value of the line active power of each power grid sub-area in each historical power grid operation control period, and the change of the line power factor of each power grid sub-area in each historical power grid operation control period.

3. The evaluation and control method based on power grid operation stability according to claim 2 is characterized in that: The line operation stability control threshold of each power grid sub-area in each historical power grid operation control period is specifically analyzed as follows: Obtain and perform one-to-one difference processing on the line operating currents belonging to the start control time points of each power grid sub-area in each historical power grid operation control period and the line operating currents belonging to the end control time points of each power grid sub-area in each historical power grid operation control period, and obtain the line operating current control values ​​of each power grid sub-area in each historical power grid operation control period; The average change rate of the line active power of each power grid sub-area in each historical power grid operation control period is specifically obtained by obtaining the line active power change curve of each power grid sub-area in each historical power grid operation control period, extracting the line active power corresponding to the highest position point and the line active power corresponding to the lowest position point, performing difference processing, and recording the difference result as the average change rate of the line active power of each power grid sub-area in each historical power grid operation control period; The average value of the line active power of each power grid sub-area in each historical power grid operation control period is specifically to extract the line active power corresponding to each power change position point from the line active power change curve of each power grid sub-area in each historical power grid operation control period, and obtain the average value of the line active power of each power grid sub-area in each historical power grid operation control period through mean processing; The line power factor change amount of each power grid sub-area in each historical power grid operation control period is specifically to obtain the line active power and line apparent power of each power grid sub-area at the start control time point of each historical power grid operation control period, and the line active power and line apparent power of each power grid sub-area at the end control time point of each historical power grid operation control period, and perform ratio processing on the line active power and line apparent power of each power grid sub-area at the start control time point of each historical power grid operation control period, and at the same time, perform ratio processing on the line active power and line apparent power of each power grid sub-area at the end control time point of each historical power grid operation control period, and then perform difference processing on the result of the ratio of the two, and finally record it as the line power factor change amount of each power grid sub-area in each historical power grid operation control period; Through the line operating current control value of each power grid sub-area in each historical power grid operation control period, the average change rate of the line active power of each power grid sub-area in each historical power grid operation control period, the average value of the line active power of each power grid sub-area in each historical power grid operation control period and the change of the line power factor of each power grid sub-area in each historical power grid operation control period, the line operation stability control threshold of each power grid sub-area in each historical power grid operation control period is comprehensively analyzed.

4. The evaluation and control method based on power grid operation stability according to claim 1 is characterized in that: The environmental information and line operation data of each power grid sub-area during the current power grid operation evaluation period are specifically as follows: The environmental information of each power grid sub-area during the current power grid operation evaluation period specifically includes the maximum ambient temperature, maximum ambient humidity, maximum dirt thickness on the line surface, and maximum wind speed of each power grid sub-area during the current power grid operation evaluation period; The line operation data specifically include the average change rate of line active power of each grid sub-area during the current grid operation evaluation period, the number of faults of the operating equipment belonging to the line, and the total number of parts replacement histories of the faulty operating equipment belonging to the line.

5. The evaluation and control method based on power grid operation stability according to claim 4 is characterized in that: The comprehensive analysis is performed to obtain the line operation fluctuation assessment value of each power grid sub-area. The specific analysis process is as follows: Comprehensively analyze the highest ambient temperature, the highest ambient humidity, the maximum dirt thickness on the line surface and the maximum wind speed of each grid sub-area during the current grid operation evaluation period to obtain the line environmental impact index of each grid sub-area during the current grid operation evaluation period; The line operation fluctuation assessment value of each grid sub-area is comprehensively analyzed through the average change rate of line active power in the current grid operation assessment period, the number of faults of the line operating equipment, the total number of parts replacement history of the faulty operating equipment belonging to the line, and the line environmental impact index of each grid sub-area in the current grid operation assessment period.

6. The evaluation and control method based on the grid operation stability according to claim 5 is characterized in that: The line environmental impact index of each power grid sub-area in the current power grid operation evaluation period is specifically obtained by: In the formula, It represents the line environmental impact index of the Nth grid sub-area during the current grid operation assessment period. Indicates the maximum ambient temperature of the Nth grid sub-area during the current grid operation evaluation period. Indicates the ambient temperature reference value preset by the power grid control library. Indicates the highest ambient humidity of the Nth grid sub-area during the current grid operation evaluation period, Indicates the ambient humidity reference value preset by the power grid control library. represents the maximum dirt thickness on the line surface of the Nth grid sub-area during the current grid operation evaluation period, Indicates the maximum wind speed of the Nth grid sub-area during the current grid operation evaluation period, represents the wind speed reference value preset by the power grid control library, e is a natural constant, Indicates the line environment correction factor of the maximum ambient temperature preset by the power grid control library, Indicates the line environment correction factor of the maximum ambient humidity preset by the power grid control library, The line environmental impact factor representing the maximum dirt thickness on the line surface preset by the power grid control library, It represents the line environment correction factor of the maximum wind speed preset in the power grid control library. N is the number of each power grid sub-area. R, R is the total number of power grid sub-areas.

7. The evaluation and control method based on power grid operation stability according to claim 1 is characterized in that: The control value required for stable operation of the line in each power grid sub-area is matched, and the specific matching process is as follows: The line operation fluctuation assessment value of each power grid sub-area is matched with the line operation stability control value corresponding to each line operation fluctuation assessment value interval preset in the power grid control library, thereby obtaining the line operation stability control value of each power grid sub-area.

8. The evaluation and control method based on power grid operation stability according to claim 1 is characterized in that: The line operation control comparison result specifically compares the line operation stability control value of a certain power grid sub-area with the line operation stability control threshold of the corresponding power grid sub-area in each historical power grid operation control period. If the line operation stability control value is greater than or equal to the line operation stability control threshold in a certain historical power grid operation control period, it is necessary to regulate the line in the power grid sub-area; if the line operation stability control values ​​are all less than the line operation stability control threshold in each historical power grid operation control period, it is not necessary to regulate the line in the power grid sub-area.

9. The evaluation and control method based on power grid operation stability according to claim 8 is characterized in that: The line control of the power grid sub-area is specifically to perform difference processing on the line operation stability control value of the power grid sub-area and the line operation stability control threshold of the corresponding power grid sub-area in each historical power grid operation control period, and record the difference processing result as the line operation control deviation value of the power grid sub-area in each historical power grid operation control period, thereby sorting them in order from small to large, extracting the historical power grid operation control period of the power grid sub-area corresponding to the line operation control deviation value ranked first, and finally obtaining the power grid line operation control plan corresponding to the historical power grid operation control period of the power grid sub-area, thereby the power grid sub-area controls the line through the power grid line operation control plan.

10. A system using the evaluation and control method based on power grid operation stability as claimed in any one of claims 1 to 9, characterized in that: include: The line stability threshold evaluation module is used to divide the grid coverage area into regions according to a preset method, obtain each grid sub-region, obtain the line control information of each grid sub-region in each historical grid operation control period, and analyze the line operation stability control threshold of each grid sub-region in each historical grid operation control period; The line fluctuation value assessment module is used to obtain the environmental information and line operation data of each power grid sub-area during the current power grid operation assessment period, and comprehensively analyze the line operation fluctuation assessment value of each power grid sub-area, thereby matching the line operation stability control value of each power grid sub-area; The line regulation and judgment module is used to compare the line operation stability control value required for each power grid sub-area with the line operation stability control threshold of each power grid sub-area in each historical power grid operation control period, obtain the line operation control comparison result, and determine whether to regulate the line in each power grid sub-area based on the line operation control comparison result.

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