Intelligent management and control method and system for substation bus capacitance current

Abstract

The application discloses a kind of substation bus capacitance current intelligent management and control method and system, the present application method includes the steps of calculating the theoretical value of capacitance current for each section bus of main transformer low voltage side;The substation bus capacitance current intelligent management and control system of the present application mainly includes data acquisition and authority, calculation and export, statistics and display, early warning and supervision and other program modules, wherein the calculation and export program module includes the theoretical value of capacitance current for each section bus of main transformer low voltage side, and carries out automatic comparison to determine the current capacitance current value I C Early warning and supervision program module is used for capacitance current overproof early warning and capacitance current deviation out-of-limit early warning etc..The present application aims at overcoming the defects that existing bus capacitance current information is not updated in time, management and control efficiency is low, completely depends on artificial, improves the intelligent degree and efficiency of capacitance current management and control.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power systems, in particular to a substation bus capacitance current intelligent management and control method and system. BACKGROUND

[0002] With the rapid development of urban distribution network and the large-scale application of power cables, the capacitance current of the bus of the distribution system is rapidly increasing, and the capacitance current of the bus of the substation is out of standard. The arc grounding overvoltage caused by the excessive capacitance current is an important reason for the line fault of the distribution network and the fire burning of the cable, but there are currently many problems such as not testing the capacitance current in time, inaccurate capacitance current measurement results, incomplete compensation of the arc extinguishing device, and untimely capacitance current management, which leaves a huge hidden danger for the safe operation of the equipment and the reliable power supply of the distribution network. Influenced by many factors such as the complex and changeable 10-35kV system distribution network, the untimely data update, the low efficiency of manual processing, and the limited capacity of the grass-roots team, the management and control efficiency of the capacitance current is very low. Therefore, in order to further improve the quality of professional management and adapt to the requirements of digitalization and online management of modern equipment management system, it is necessary to develop an intelligent management and control system for the capacitance current of the bus of the substation to realize the intelligent management and control of the capacitance current of the bus and the active early warning of the arc grounding overvoltage risk. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a substation bus capacitance current intelligent management and control method and system to overcome the defects of the prior art such as untimely update of the bus capacitance current information, low management and control efficiency, and complete dependence on manual work, and to improve the intelligent degree and efficiency of the capacitance current management and control.

[0004] To solve the above technical problems, the technical scheme adopted by the present application is as follows:

[0005] A substation bus capacitance current intelligent management and control method, comprising the steps of calculating the capacitance current theoretical value of each section of the bus on the low-voltage side of the main transformer: for each outgoing line on each section of the bus on the low-voltage side of the main transformer, first calculating the capacitance current theoretical value of each section of the line according to the line type of each section of the line, and then summing the capacitance current theoretical values of each section of the line to obtain the capacitance current theoretical value of the outgoing line; for each section of the bus on the low-voltage side of the main transformer, summing the capacitance current theoretical values of each outgoing line on the bus to obtain the capacitance current theoretical value.

[0006] Optionally, when calculating the capacitance current theoretical value of each section of the line, the line type includes three types of overhead bare conductor, overhead insulated conductor and power cable, and the calculation function expression of the capacitance current theoretical value of the overhead bare conductor is:

[0007] I C1 =a×U n ×10-3 ×L

[0008] The calculation function expression of the capacitive current theoretical value of the overhead insulated conductor is:

[0009] I C1 =b×L

[0010] The calculation function expression of the capacitive current theoretical value of the power cable is:

[0011]

[0012] Wherein, I C1 represents the capacitive current theoretical value, a, b, c, d, e and f are coefficients, the coefficient a of the overhead ground wire line and the overhead ground wire line is different, U n is the system line voltage, L is the line length, and S is the cable cross-sectional area.

[0013] Optionally, the coefficient a of the overhead ground wire line is 2.7, the coefficient a of the overhead ground wire line is 3.3, the coefficient b is 0.05, the coefficient c is 95, the coefficient d is 1.44, the coefficient e is 2200, and the coefficient f is 0.23.

[0014] Optionally, after calculating the capacitive current theoretical value for each section of the busbar on the low-voltage side of the main transformer, the method further comprises the step of distributing and counting the capacitive current theoretical value according to a specified distribution counting interval.

[0015] Optionally, the specified distribution counting interval comprises four intervals of 0-50A, 50-100A, 100-150A, and greater than 150A.

[0016] Optionally, after calculating the capacitive current theoretical value for each section of the busbar on the low-voltage side of the main transformer, the method further comprises the step of automatically comparing the capacitive current for any busbar to determine the current capacitive current value I C .

[0017] S101, obtaining the capacitive current instrument test value I C2 obtained by the capacitive current measuring instrument and the arc suppression coil controller capacitive current value I C3 in the arc suppression coil controller operation data;

[0018] S102, judging the abnormal data for the capacitive current theoretical value I C1 , the capacitive current instrument test value I C2 , and the arc suppression coil controller capacitive current value I C3 , respectively, if it is null, less than or equal to 0, or greater than a set value, it is determined as abnormal data, and the number of abnormal data N is determined.

[0019] S103, if the number of abnormal data N equals 2, then determine the capacitor current value I. C If the value is normal, the process ends and exits; if the number of abnormal data N equals 1, then proceed to step S104; if the number of abnormal data N equals 0, then proceed to step S105.

[0020] S104, if the arc suppression coil controller capacitor current value I C3 If abnormal, the theoretical value of the capacitor current I will be used. C1 Capacitance current instrument test value I C2 The average of the two values ​​is then used as the capacitor current value I. C End and exit; if the arc suppression coil controller capacitor current value I C3 Normal capacitance current instrument test value I C2 If abnormal, the theoretical value of the capacitor current I will be used. C1 Arc suppression coil controller capacitor current value I C3 The average of the two values ​​is then used as the capacitor current value I. C End and exit; if the arc suppression coil controller capacitor current value I C3 Capacitance current instrument test value I C2 If all values ​​are normal, then set the capacitance current instrument test value I. C2 Arc suppression coil controller capacitor current value I C3 The average of the two values ​​is then used as the capacitor current value I. C End and exit;

[0021] S105, based on the theoretical value of capacitor current I C1 Capacitance current instrument test value I C2 Arc suppression coil controller capacitor current value I C3 Calculate capacitor current deviation:

[0022] ΔI1=|I C1 -I C2 |,ΔI2=|I C2 -I C3 |,ΔI3=|I C1 -I C3 |;

[0023] S5, let condition ① be ΔI1 < ΔI2 and ΔI2 < ΔI3; let condition ② be condition ① not true, but ΔI2 < ΔI1 and ΔI2 < ΔI3; let condition ③ be condition ① not true, condition ② not true, but I C1 C3 C2 or I C2 C3 C1 When condition ① is true, if I C2 <I​​​​C2 C3 or I C3 C1 C2 If true, then determine the current capacitor current value I. C The value is the theoretical value of the capacitor current I. C1 Otherwise, determine the current capacitor current value I. C The value is the capacitance current measured by the instrument, I. C2 When condition ② is true, if I C1 C2 C3 or I C3 C2 C1 If true, then determine the current capacitor current value I. C The measured value I of the capacitance current instrument C2 Otherwise, determine the current capacitor current value I. C The value is the capacitor current value I of the arc suppression coil controller. C3 When condition ③ is met, determine the current capacitor current value I. C The value is the capacitor current value I of the arc suppression coil controller. C3 Otherwise, determine the current capacitor current value I. C The value is the theoretical value of the capacitor current I. C1 .

[0024] Optionally, the step of determining the current capacitor current value I C The following steps also include issuing an early warning for excessive capacitive current on any busbar:

[0025] S201, determine the neutral point grounding method of the main transformer. If it is ungrounded, proceed to step S202; if it is grounded through an arc coil, proceed to step S203; otherwise, proceed to step S204.

[0026] S202, determine the outgoing line type of the main transformer. If the outgoing line type of the main transformer is mainly overhead conductor, and the current capacitor current value I... C If the current exceeds 10A, a Level 1 warning for excessive capacitor current will be issued; if the main transformer's outgoing lines are primarily power cables, and the current capacitor current value is I... C If the current exceeds 30A, a Level 1 warning for excessive capacitor current will be issued; then the process will end and exit.

[0027] S203: Determine if there are any other abnormalities in the arc suppression coil. If there are other abnormalities, issue a manual warning, end and exit; otherwise, perform a capacitor current compensation judgment for the arc suppression coil, end and exit.

[0028] ​​​​​​​S204, judging whether the neutral grounding device has other abnormalities, if the neutral grounding device has no other abnormalities, outputting that the capacitance current compensation is normal, ending and exiting; otherwise, issuing a manual early warning, ending and exiting.

[0029] Optionally, the judging of the capacitance current compensation for the arc suppression coil in step S203 comprises:

[0030] S301, calculating the capacity W1 considering the multiple and the capacity W2 not considering the multiple according to the following formula respectively;

[0031]

[0032] In the above formula, I C is the current capacitance current value, U n is the system line voltage;

[0033] S302, calculating the capacity difference of the capacity W1 considering the multiple and the capacity W2 not considering the multiple and the arc suppression coil capacity W0 configured for the section busbar according to the following formula respectively;

[0034] ΔW1=W0-W1, ΔW2=W0-W2,

[0035] In the above formula, ΔW1 is the capacity difference obtained by subtracting the capacity W1 considering the multiple from the arc suppression coil capacity W0 configured for the section busbar, and ΔW2 is the capacity difference obtained by subtracting the capacity W2 not considering the multiple from the arc suppression coil capacity W0 configured for the section busbar.

[0036] S303, when the capacity difference ΔW1 is greater than 0, determining that the capacitance current compensation is normal, ending and exiting; when the capacity difference ΔW1 is less than 0 and if the capacity difference ΔW2 is greater than 0, if the standby interval number M is equal to 0, determining that the capacitance current compensation is normal, ending and exiting; otherwise, jumping to step S304;

[0037] S304, if the capacity difference ΔW1 satisfies |ΔW1|>120kVA, issuing a first-level pre-warning of the capacitance current exceeding the standard, if the capacity difference ΔW1 satisfies 120kVA>|ΔW1|>60kVA, issuing a second-level pre-warning of the capacitance current exceeding the standard, and if the capacity difference ΔW1 satisfies 60kVA>|ΔW1|, issuing a third-level pre-warning of the capacitance current exceeding the standard; ending and exiting.

[0038] Optionally, after the calculating of the capacitance current theoretical value for each section busbar on the low-voltage side of the main transformer, the method further comprises the step of performing a capacitance current deviation out-of-limit pre-warning for any one busbar:

[0039] S401, judging the neutral grounding mode of the section busbar, if it is the grounding through the arc suppression coil, jumping to step S402, otherwise, jumping to step S403;

[0040] S402, according to the capacitor current theoretical value I C1 , capacitor current instrument test value I C2 , the arc suppression coil controller capacitor current value I C3 Calculate capacitor current deviation: ΔI1=|I C1 -I C2 |, ΔI2=|I C2 -I C3 |, ΔI3=|I C1 -I C3 |, and take the maximum value among the three capacitor current deviations ΔI1, ΔI2 and ΔI3 as the capacitor current deviation ΔI C ; Jump to step S404;

[0041] S403, according to the capacitor current theoretical value I C1 , capacitor current instrument test value I C2 Calculate ΔI C =|I C1 -I C2 | to get capacitor current deviation ΔI C ;

[0042] S404, when ΔI C >30A, issue a one-level pre-warning of capacitor current deviation overrun, when 20A<ΔI C ≤30A, issue a two-level pre-warning of capacitor current deviation overrun, when 10A<ΔI C ≤20A, issue a three-level pre-warning of capacitor current deviation overrun, and when ΔI C ≤10A, determine that the capacitor current is normal.

[0043] In addition, the present application also provides a substation bus capacitor current intelligent management and control system, comprising a microprocessor and a memory connected to each other, the microprocessor being programmed or configured to execute the steps of the substation bus capacitor current intelligent management and control method.

[0044] Optionally, the microprocessor is further connected to a capacitor current measuring instrument through a data acquisition component or a data communication component to acquire the capacitor current instrument test value I C2 , and connected to an arc suppression coil controller to acquire the arc suppression coil controller capacitor current value I C3 in the arc suppression coil controller operation data.

[0045] In addition, the present application also provides a computer readable storage medium, wherein a computer program is stored in the computer readable storage medium, and the computer program is used to program or configure the microprocessor to execute the steps of the substation bus capacitor current intelligent management and control method.

[0046] Compared with the prior art, the present application has the following advantages:

[0047] 1. The method of the present application comprises the step of calculating the theoretical value of the capacitance current for each section of the bus on the low-voltage side of the main transformer: for each outgoing line on each section of the bus on the low-voltage side of the main transformer, first calculate the theoretical value of the capacitance current for each section of the line according to the type of the line, then sum the theoretical values of the capacitance current for each section of the line to obtain the theoretical value of the capacitance current for the outgoing line; for each section of the bus, sum the theoretical values of the capacitance current for each outgoing line on the bus to obtain the theoretical value of the capacitance current. By automatically calculating the theoretical value of the capacitance current, the present application can effectively overcome the defects of the prior art, such as the slow updating of the information of the capacitance current of the bus, the low efficiency of management and control, and the complete dependence on manual operation, thereby improving the intelligent degree and efficiency of the management and control of the capacitance current.

[0048] 2. Based on the theoretical value of the capacitance current, the present application can further perform extended application functions based on the theoretical value of the capacitance current, such as automatic comparison of the capacitance current, pre-warning of over-standard capacitance current, or pre-warning of over-limit deviation of the capacitance current. BRIEF DESCRIPTION OF DRAWINGS

[0049] Figure 1 The flowchart for calculating the theoretical value of the capacitance current in the embodiment of the present application.

[0050] Figure 2 The flowchart for automatic comparison of the capacitance current in the embodiment of the present application.

[0051] Figure 3 The flowchart for pre-warning of over-standard capacitance current in the embodiment of the present application.

[0052] Figure 4 The flowchart for pre-warning of over-limit deviation of the capacitance current in the embodiment of the present application.

[0053] Figure 5 The schematic diagram of the program module division structure of the system in the embodiment of the present application. DETAILED DESCRIPTION

[0054] As Figure 1As shown, the substation bus capacitance current intelligent management and control method of the embodiment includes the step of calculating the capacitance current theoretical value for each section of the low-voltage side of the main transformer: for each outgoing line on each section of the low-voltage side of the main transformer, first, the capacitance current theoretical value of each section of the line is calculated according to the line type of each section of the line, and then the capacitance current theoretical values of each section of the line are summed to obtain the capacitance current theoretical value of the outgoing line; for each section of the low-voltage side of the main transformer, the capacitance current theoretical values of each outgoing line on the bus are summed to obtain the capacitance current theoretical value. The line types of the 10kV outgoing lines of the substation are mainly three types, which are: overhead bare conductor, overhead insulated conductor and power cable. Each section of the low-voltage side of the main transformer is calculated, and the calculation result is the sum of the capacitance current theoretical values of all outgoing lines; if a outgoing line has multiple sections of different types of lines connected, then each section is calculated and added to obtain the capacitance current theoretical value of the outgoing line. For example: a 110kV substation has I and II two sections of 10kV buses, I bus has n outgoing line intervals, and II bus has m outgoing line intervals, then the capacitance current theoretical value of I bus is: CI母

[0055]

[0056] In the above formula, I CI1 ~I CIn are the capacitance current theoretical values of the first-n outgoing line intervals of I bus, and I CIx represents the capacitance current theoretical value of any xth outgoing line interval of I bus.

[0057] Similarly, the capacitance current theoretical value of II bus is:

[0058]

[0059] In the above formula, I CII1 ~I CIIn are the capacitance current theoretical values of the first-n outgoing line intervals of I bus, and I CIIx represents the capacitance current theoretical value of any xth outgoing line interval of II bus.

[0060] For line 1 of I bus, if the outgoing line has 2 sections of overhead bare conductor, 1 section of overhead insulated conductor and 1 section of power cable, then its capacitance current theoretical value is calculated by the following formula:

[0061] I CI1 =I C裸导1 +I C裸导2 +I C绝缘 +I C电缆

[0062] In the above formula, I CI1 ​The I is the theoretical value of the capacitive current of the line 1 of the I mother, and the right four symbols respectively represent the theoretical value of the capacitive current of the first section of the overhead bare conductor, the second section of the overhead bare conductor, the overhead insulated conductor and the power cable. The calculation method of other outgoing lines is the same.

[0063] In this embodiment, when calculating the theoretical value of the capacitive current of each section of the line, the line type includes three types of overhead bare conductor, overhead insulated conductor and power cable, and the calculation function expression of the theoretical value of the capacitive current of the overhead bare conductor is:

[0064] I C1 =a×U n ×10 -3 ×L

[0065] The calculation function expression of the theoretical value of the capacitive current of the overhead insulated conductor is:

[0066] I C1 =b×L

[0067] The calculation function expression of the theoretical value of the capacitive current of the power cable is:

[0068]

[0069] Wherein, I C1 represents the theoretical value of the capacitive current, a, b, c, d, e and f are coefficients, the coefficient a of the line without overhead ground wire is different from the coefficient a of the line with overhead ground wire, U n is the system line voltage, L is the line length, and S is the cable cross-sectional area. The coefficients a, b, c, d, e and f can be valued according to the actual situation. For example, in this embodiment, the coefficient a of the line without overhead ground wire is valued as 2.7, the coefficient a of the line with overhead ground wire is valued as 3.3, the coefficient b is valued as 0.05 (0.05A), the coefficient c is valued as 95, the coefficient d is valued as 1.44, the coefficient e is valued as 2200, and the coefficient f is valued as 0.23, that is:

[0070] I C1 =(2.7~3.3)×U n ×10 -3 ×L

[0071] The unit-to-ground capacitive current of the overhead insulated conductor is 0.05A, so the calculation function expression of the theoretical value of the capacitive current of the overhead insulated conductor is:

[0072] I C1 =0.05×L

[0073] The calculation function expression of the theoretical value of the capacitive current of the power cable is:

[0074]

[0075] Note: ① The length of the application circuit and the type of the capacitor current are calculated, and the cable cross-sectional area S and the length of the line of each 10kV bus of the substation are completely checked out; ② The cable and overhead line laying length and cable laying type of the cable-overhead hybrid line must be checked out respectively; ③ The 10kV tie line is not included in the calculation process.

[0076] In this embodiment, after calculating the theoretical value of the capacitance current of each section of the low-voltage side of the main transformer, the step of distributing and counting the theoretical value of the capacitance current according to the specified distribution counting interval is further included. For example, as an optional embodiment, the specified distribution counting interval in this embodiment includes four intervals of 0-50A, 50-100A, 100-150A and greater than 150A.

[0077] As shown in Figure 2 , after calculating the theoretical value of the capacitance current of each section of the low-voltage side of the main transformer, the step of automatically comparing the capacitance current of any one bus to determine the current capacitance current value I C is further included in this embodiment:

[0078] S101, obtaining the capacitance current instrument test value I C2 obtained by the capacitance current measuring instrument and the arc suppression coil controller capacitance current value I C3 in the arc suppression coil controller operation data; in this embodiment, the capacitance current instrument test value I C2 is the test result of the capacitance current measuring instrument input by manual or obtained by remote transmission, and the arc suppression coil controller capacitance current value I C3 is obtained by remote transmission of the arc suppression coil controller operation data;

[0079] S102, judging the abnormal data for the capacitance current theoretical value I C1 , the capacitance current instrument test value I C2 and the arc suppression coil controller capacitance current value I C3 , if it is null, less than or equal to 0, greater than the set value, it is determined as abnormal data, and the number of abnormal data N is determined; as a specific embodiment, in this embodiment, when the capacitance current value is 0, null, less than 0A, greater than 400A (which can be adjusted according to the actual situation), it is judged that the capacitance current value is abnormal;

[0080] S103, if the number of abnormal data N is equal to 2, it is determined that the capacitance current value I C is a normal value, and the process is ended and exited; if the number of abnormal data N is equal to 1, it is jumped to step S104; if the number of abnormal data N is equal to 0, it is jumped to step S105;

[0081] S104, if the arc suppression coil controller capacitance current value I C3If the capacitor current is abnormal, the theoretical value of the capacitor current I C1 , the capacitor current instrument test value I C2 , and the arc suppression coil controller capacitor current value I C are averaged to obtain the capacitor current value I C3 , and the program ends and exits; if the capacitor current is normal, the capacitor current instrument test value I C2 , and the arc suppression coil controller capacitor current value I C1 are averaged to obtain the capacitor current value I C3 , and the program ends and exits; if the capacitor current is normal, the capacitor current instrument test value I C , and the arc suppression coil controller capacitor current value I C3 are averaged to obtain the capacitor current value I C2 , and the program ends and exits; if the capacitor current is normal, the capacitor current instrument test value I C2 , and the arc suppression coil controller capacitor current value I C3 are averaged to obtain the capacitor current value I C , and the program ends and exits; when the number of abnormal data is 2, the output result is the only normal capacitor current value; when the number of abnormal data is 1, the output result is the average of the other two normal capacitor current values; when the number of abnormal data is 0, the two capacitor current values closest to each other should be determined first, and the value closer to the other value (i.e., the middle value) is outputted.

[0082] S105, the theoretical value of the capacitor current I C1 , the capacitor current instrument test value I C2 , and the arc suppression coil controller capacitor current value I C3 are used to calculate the capacitor current deviation:

[0083] ΔI1 = |I C1 -I C2 |, ΔI2 = |I C2 -I C3 |, and ΔI3 = |I C1 -I C3 |;

[0084] S5, condition ① is recorded as ΔI1 < ΔI2 and ΔI2 < ΔI3; condition ② is recorded as condition ① is not established, ΔI2 < ΔI1, and ΔI2 < ΔI3; condition ③ is recorded as condition ① is not established, condition ② is not established, I C1 <I C3 <I C2 , or I C2 <I C3 <I C1 ; when condition ① is established, if I C2 <I C2 <I C3 , or I C3 <IC1 C2 If true, then determine the current capacitor current value I. C The value is the theoretical value of the capacitor current I. C1 Otherwise, determine the current capacitor current value I. C The value is the capacitance current measured by the instrument, I. C2 When condition ② is true, if I C1 C2 C3 or I C3 C2 C1 If true, then determine the current capacitor current value I. C The measured value I of the capacitance current instrument C2 Otherwise, determine the current capacitor current value I. C The value is the capacitor current value I of the arc suppression coil controller. C3 When condition ③ is met, determine the current capacitor current value I. C The value is the capacitor current value I of the arc suppression coil controller. C3 Otherwise, determine the current capacitor current value I. C The value is the theoretical value of the capacitor current I. C1 .

[0085] like Figure 3 As shown, determine the current capacitor current value I. C The following steps also include issuing an early warning for excessive capacitive current on any busbar:

[0086] S201, determine the neutral point grounding method of the main transformer. If it is ungrounded, proceed to step S202; if it is grounded through an arc coil, proceed to step S203; otherwise, proceed to step S204.

[0087] S202, determine the outgoing line type of the main transformer. If the outgoing line type of the main transformer is mainly overhead conductor, and the current capacitor current value I... C If the current exceeds 10A, a Level 1 warning for excessive capacitor current will be issued; if the main transformer's outgoing lines are primarily power cables, and the current capacitor current value is I... C If the current exceeds 30A, a Level 1 warning for excessive capacitor current will be issued; then the process will end and exit.

[0088] S203: Determine if there are any other abnormalities in the arc suppression coil. If there are other abnormalities, issue a manual warning, end and exit; otherwise, perform a capacitor current compensation judgment for the arc suppression coil, end and exit.

[0089] S204: Determine if there are no other abnormalities in the neutral point grounding device. If there are no other abnormalities in the neutral point grounding device, the output capacitor current compensation is normal, and the process ends and exits. Otherwise, issue a manual warning, and the process ends and exits. ​​​​​

[0090] As Figure 3 shown, the step S203 for the arc suppression coil for capacitive current compensation judgment includes:

[0091] S301, according to the following formula respectively calculates the capacity W1 considering the multiple and the capacity W2 not considering the multiple;

[0092]

[0093] In the above formula, I C is the current capacitive current value, U n is the system line voltage;

[0094] S302, according to the following formula respectively calculates the capacity difference between the capacity W1 considering the multiple and the capacity W2 not considering the multiple and the arc suppression coil capacity W0 configured for the section bus;

[0095] ΔW1=W0-W1, ΔW2=W0-W2,

[0096] In the above formula, ΔW1 is the capacity difference obtained by subtracting the capacity W1 considering the multiple from the arc suppression coil capacity W0 configured for the section bus, and ΔW2 is the capacity difference obtained by subtracting the capacity W2 not considering the multiple from the arc suppression coil capacity W0 configured for the section bus;

[0097] S303, when the capacity difference ΔW1 is greater than 0, it is determined that the capacitive current compensation is normal, and the process is ended and exited; when the capacity difference ΔW1 is less than 0 and if the capacity difference ΔW2 is greater than 0, if the standby interval number M is equal to 0, it is determined that the capacitive current compensation is normal, and the process is ended and exited; otherwise, jump to step S304;

[0098] S304, if the capacity difference ΔW1 satisfies |ΔW1|>120kVA, an early warning of capacitive current exceeding the first level is issued, if the capacity difference ΔW1 satisfies 120kVA>|ΔW1|>60kVA, an early warning of capacitive current exceeding the second level is issued, and if the capacity difference ΔW1 satisfies 60kVA>|ΔW1|, an early warning of capacitive current exceeding the third level is issued; the process is ended and exited.

[0099] As Figure 4 shown, after calculating the capacitive current theoretical value for each section bus of the low-voltage side of the main transformer, the process further includes the step of early warning of capacitive current deviation exceeding the limit for any one bus:

[0100] S401, judge the neutral point grounding mode of the section bus, if it is grounded through the arc suppression coil, jump to step S402, otherwise, jump to step S403;

[0101] S402, according to the capacitive current theoretical value I C1 , the capacitive current instrument test value I C2 , the arc suppression coil controller capacitive current value IC3 Calculate the capacitance current deviation: ΔI1 = |I C1 -I C2 |, ΔI2 = |I C2 -I C3 |, ΔI3 = |I C1 -I C3 |, and take the maximum value among the three capacitance current deviations ΔI1, ΔI2 and ΔI3 as the capacitance current deviation ΔI C ; jump to step S404;

[0102] S403, according to the capacitance current theoretical value I C1 , the capacitance current instrument test value I C2 , calculate ΔI C = |I C1 -I C2 | to get the capacitance current deviation ΔI C ;

[0103] S404, when ΔI C > 30A, issue a one-level pre-warning of the capacitance current deviation overrun, when 20A < ΔI C ≤ 30A, issue a two-level pre-warning of the capacitance current deviation overrun, when 10A < ΔI C ≤ 20A, issue a three-level pre-warning of the capacitance current deviation overrun, and when ΔI C ≤ 10A, determine that the capacitance current is normal.

[0104] In addition, the embodiment also provides a substation bus capacitance current intelligent management and control system, which comprises a microprocessor and a memory connected with each other, and the microprocessor is programmed or configured to execute the steps of the foregoing substation bus capacitance current intelligent management and control method. Wherein, the microprocessor is further connected with a capacitance current measuring instrument through a data acquisition component or a data communication component to acquire the capacitance current instrument test value I C2 acquired through the capacitance current measuring instrument, and is connected with an arc-extinguishing coil controller to acquire the arc-extinguishing coil controller capacitance current value I C3 in the arc-extinguishing coil controller operation data.

[0105] The substation bus capacitance current intelligent management and control system in the embodiment is based on the basic information of the distribution network 10-35 kV line, mainly including the conductor type, length, cross-sectional area, and topological relationship, and performs on-line automatic calculation of the capacitance current. The on-line calculation result of the capacitance current is updated in real time when the bus changes the operation mode or the feeder is put into or withdrawn from the service by collecting the information of the bus coupler and feeder circuit breaker on / off state. The capacitance current value closer to the true value is obtained by comparing the on-line calculation result of the capacitance current with the test data of the capacitance current instrument and the capacitance current data of the arc suppression coil controller (if any), to realize automatic early warning of the capacitance current exceeding the standard (arc ground overvoltage risk) and the deviation of the capacitance current of the arc suppression coil exceeding the limit, and to provide manual early warning function. In addition, the data can be accessed remotely through the PC / Web client, and the capacitance current can be monitored in real time, conveniently and comprehensively. The system automatically collects and compares the data and forms a warning reminder notice, which can be assigned to the operation and maintenance unit to urge it to carry out the corresponding capacitance current management work. As shown in FIG. Figure 5 The substation bus capacitance current intelligent management and control system in the embodiment mainly includes four program modules of data acquisition and permission, calculation and export, statistics and display, early warning and supervision. The data involved in the data acquisition and permission mainly includes the conductor account, cable segment account, large feeder account, bus account, arc suppression device account, standby interval account, large feeder image attribute extension information, vector data under the large feeder, large feeder information under the bus, bus coupler and feeder circuit breaker on / off information, substation line topological information, and arc suppression coil operation state information. The permissions in the embodiment are divided into provincial level and city level, and the display contents of different permission levels are different. The export contents involved in the calculation and export mainly include the substation, bus, grounding mode, arc suppression device basic information, bus capacitance current (each feeder name, each feeder capacitance current, overhead bare conductor length, overhead insulated conductor length, each cross-section power cable length), tolerance, compensation state, etc.

[0106] In this embodiment, the statistical and display module is processed according to the provincial level and the city level, and the statistical and display contents are as follows: (1) provincial level: ① grounding mode: the number of different types of arc suppression coil grounding mode in the substation is counted; ② capacitive current compensation: the arc suppression coil grounding system can be divided into under-compensation and over-compensation; the ungrounded system can be divided into capacitive current less than 10A, 10-30A and greater than 30A; ③ early warning and supervision: divided into manual early warning and automatic early warning; ④ theoretical calculation: query and export capacitive current data; ⑤ capacitive current distribution statistics: 0-50A, 50-100A, 100-150A, greater than 150A. (2) City level: ① grounding mode: the number of different types of arc suppression coil grounding mode in the substation is counted; ② capacitive current compensation: the arc suppression coil grounding system can be divided into under-compensation and over-compensation; the ungrounded system can be divided into capacitive current less than 10A, 10-30A and greater than 30A; ③ early warning and supervision: divided into manual early warning and automatic early warning; ④ theoretical calculation: query and export capacitive current data; ⑤ arc suppression coil under-compensation trend statistics.

[0107] In this embodiment, the early warning and supervision module is used to realize the early warning of capacitive current exceeding the standard (arc grounding overvoltage risk) and the early warning of capacitive current deviation exceeding the limit, as described in the steps of the method. The operation and maintenance personnel can change the neutral point grounding device operation state information according to the on-site inspection results to realize manual early warning, which is also divided into three levels: manual first-level early warning: arc suppression coil without automatic tuning function, tap switch damage, controller cannot normally adjust, grounding transformer / arc suppression device / damping resistor / thyristor test data anomaly, etc. Manual second-level early warning: arc suppression coil controller often displays incorrectly, bus parallel operation and two sets of arc suppression coils cannot be operated online when two controllers are configured. Manual third-level early warning: arc suppression coil controller display abnormality (crash, black screen, but can be normally adjusted) and the like.

[0108] In addition, the embodiment also provides a computer readable storage medium, the computer readable storage medium stores a computer program, the computer program is used for being programmed or configured by a microprocessor to execute the steps of the aforementioned substation bus capacitive current intelligent management and control method.

[0109] Those skilled in the art will appreciate that embodiments of the application can be readily used as a method, apparatus, or computer program product. Accordingly, the application can take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the application can take the form of a computer program product on one or more computer readable storage media (including, but not limited to, disk memory, CD-ROMs, optical storage devices, etc.) embodying computer readable program code. The application is described in reference to the flow diagrams and / or block diagrams of the methods, apparatus (systems) and computer program products according to embodiments of the application illustrated in the attached drawings, which flow diagrams and / or block diagrams Figure 1 one or more functions specified in the flow diagram and / or block diagram. These computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instructions which implement the function specified in the flow diagram and / or block diagram. Figure 1 one or more functions specified in the flow diagram and / or block diagram. These computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instructions which implement the function specified in the flow diagram and / or block diagram. Figure 1 one or more functions specified in the flow diagram and / or block diagram. These computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instructions which implement the function specified in the flow diagram and / or block diagram. Figure 1 one or more functions specified in the flow diagram and / or block diagram. These computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instructions which implement the function specified in the flow diagram and / or block diagram. Figure 1 one or more functions specified in the flow diagram and / or block diagram. These computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instructions which implement the function specified in the flow diagram and / or block diagram. Figure 1 one or more functions specified in the flow diagram and / or block diagram. These computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instructions which implement the function specified in the flow diagram and / or block diagram.

[0110] The above description is only preferred embodiments of the application, the protection scope of the application is not limited to the above-mentioned embodiments, any technical scheme falling within the idea of the application shall fall within the protection scope of the application. It should be noted that, for ordinary skilled in the art, some improvements and refinements without departing from the principle of the application, these improvements and refinements shall be considered as the protection scope of the application.

Claims

1. A method for intelligent management and control of substation busbar capacitive current, characterized in that, The step of calculating the theoretical value of the capacitance current for each section of the bus on the low-voltage side of the main transformer includes: for each outgoing line on each section of the bus on the low-voltage side of the main transformer, first calculating the theoretical value of the capacitance current of each section of line according to the line type of each section of line on the outgoing line, and then summing the theoretical values of the capacitance currents of each section of line to obtain the theoretical value of the capacitance current of the outgoing line; for each section of the bus on the low-voltage side of the main transformer, summing the theoretical values of the capacitance currents of the outgoing lines on the bus to obtain the theoretical value of the capacitance current of the bus, and performing automatic comparison of the capacitance current for any bus to determine the current capacitance current value I C the step of calculating the theoretical value of the capacitance current for each section of the bus on the low-voltage side of the main transformer includes: for each outgoing line on each section of the bus on the low-voltage side of the main transformer, first calculating the theoretical value of the capacitance current of each section of line according to the line type of each section of line on the outgoing line, and then summing the theoretical values of the capacitance currents of each section of line to obtain the theoretical value of the capacitance current of the outgoing line; for each section of the bus on the low-voltage side of the main transformer, summing the theoretical values of the capacitance currents of the outgoing lines on the bus to obtain the theoretical value of the capacitance current of the bus, and performing automatic comparison of the capacitance current for any bus to determine the current capacitance current S101, acquire the capacitor current instrument test value obtained by testing with a capacitor current measuring instrument I C2 , and the arc suppression coil controller capacitor current value in the arc suppression coil controller operation data I C3 ; S102, for the capacitor current theoretical value I C1 , capacitor current instrument test value I C2 , arc suppression coil controller capacitor current value I C3 Three respectively carry out abnormal data judgment, if null, less than or equal to 0, greater than the set value, then determine the abnormal data, determine the number of abnormal data N; S103, if the number of abnormal data N is equal to 2, then determine the capacitance current value I C is a normal value, end and exit; If the number of abnormal data N is equal to 1, jump to step S104; if the number of abnormal data N is equal to 0, jump to step S105; S104, if the arc suppression coil controller capacitance current value I C3 abnormal, the capacitance current theoretical value I C1 , capacitance current instrument test value I C2 both average values as the capacitance current value I C , end and exit; If the arc suppression coil controller capacitor current value I C3 Normal, the capacitor current instrument test value I C2 Abnormal, the capacitor current theoretical value I C1 , the arc suppression coil controller capacitor current value I C3 The average of the two is taken as the capacitor current value I C , end and exit; If the arc suppression coil controller capacitor current value I C3 , the capacitor current instrument test value I C2 are both normal, then the capacitor current instrument test value I C2 , the arc suppression coil controller capacitor current value I C3 are averaged and then taken as the capacitor current value I C , end and exit; S105, calculate the capacitance current value according to the capacitance current theory value I C1 , capacitance current instrument test value I C2 , arc suppression coil controller capacitance current value I C3 Calculate the capacitance current deviation: ； S106, record condition 1 as Δ I 1 < Δ I 2 and Δ I 2 < Δ I 3; record condition 2 as condition 1 not being true, and Δ I 2 < Δ I 1 and Δ I 2 < Δ I 3; record condition 3 as condition 1 not being true, condition 2 not being true, and Δ I C1 I C3 I C2 or I C2 I C3 I C1 ; when condition 1 is true, if I C2 I C2 I C3 or I C3 I C1 I C2 is true, then determine that the value of the current capacitor current value I C is the capacitor current theoretical value I C1 , otherwise determine that the value of the current capacitor current value I C is the capacitor current instrument test value I C2 ; when condition 2 is true, if I C1 I C2 I C3 or I C3 I C2 I C1 is true, then determine that the current capacitor current value I C is the capacitor current instrument test value I C2 , otherwise determine that the value of the current capacitor current value I C is the arc suppression coil controller capacitor current value I C3 ​​​​​​​​​​​​; when condition ③ is satisfied, the current capacitor current value I C is determined to be the value of the arc suppression coil controller capacitor current value I C3 , otherwise the current capacitor current value I C is determined to be the value of the capacitor current theoretical value I C1 .

2. The substation busbar capacitive current intelligent management and control method according to claim 1, characterized in that, The line type includes overhead bare conductor, overhead insulated conductor and power cable, and the calculation function expression of the theoretical value of the capacitive current of the overhead bare conductor is: The calculation function expression of the theoretical value of the capacitive current of the overhead insulated conductor is: The calculation function expression of the theoretical value of the capacitive current of the power cable is: wherein I C1 represents the theoretical value of the capacitive current, a, b, c, d, e and f is a coefficient, the coefficient of the line without overhead ground wire and the coefficient of the line with overhead ground wire a is different, U n is the system line voltage, L is the length of the line, S is the cross-sectional area of the cable. 3.The substation busbar capacitive current intelligent management and control method according to claim 2, characterized in that, the coefficient of the line without overhead ground wire a the coefficient of the line with overhead ground wire a the coefficient b the coefficient c the coefficient d the coefficient e the coefficient f the coefficient 4. The substation busbar capacitive current intelligent management and control method of claim 1, wherein, After the step of calculating the theoretical value of the capacitive current of each bus of the low-voltage side of the main transformer, the method further comprises a step of distributing and counting the theoretical value of the capacitive current of the bus according to a specified distribution counting interval.

5. The substation busbar capacitive current intelligent management and control method according to claim 4, characterized in that, The specified distribution counting interval includes four intervals of 0-50A, 50-100A, 100-150A and greater than 150A.

6. The substation busbar capacitive current intelligent management and control method according to claim 1, characterized in that, said determining the current capacitance current value I C Afterwards, the method further comprises the step of prewarning for any busbar that the capacitance current exceeds the standard. S201, judging the grounding mode of the neutral point of the main transformer, if not grounded, jump to step S202; if grounded through arc suppression coil, jump to step S203; Otherwise, jump to step S204; S202, determine the outgoing line type of the main transformer, if the outgoing line type of the main transformer is mainly overhead line, and the current capacitive current value I C is greater than 10A, issue a first-level pre-warning of capacitive current exceeding the standard; if the outgoing line type of the main transformer is mainly power cable, and the current capacitive current value I C is greater than 30A, issue a first-level pre-warning of capacitive current exceeding the standard; end and exit; S203, judging whether the arc suppression coil has other abnormalities, if yes, issuing an artificial early warning, ending and exiting; Otherwise, judging the capacitive current compensation of the arc suppression coil, ending and exiting; S204, judging whether the neutral point grounding device has other abnormalities, if the neutral point grounding device has no other abnormalities, outputting that the capacitive current compensation is normal, ending and exiting; Otherwise, issuing an artificial early warning, ending and exiting.

7. The substation busbar capacitive current intelligent management and control method according to claim 6, characterized in that, The step of judging the capacitive current compensation of the arc suppression coil in step S203 comprises: S301, the capacity considering the multiple is calculated according to the following formula respectively W 1 and the capacity not considering the multiple W 2; ， In the above formula, I C is the current capacitance current value, U n is the system line voltage; S302, the capacity considering the multiple is calculated according to the following formula respectively W 1 and the capacity not considering the multiple W 2 and the arc suppression coil capacity configured for the segment bus W 0 the capacity difference; ， In the above formula, Δ W 1 is the arc suppression coil capacity configured for the section of bus W 0 is the capacity minus the capacity considering the multiplication factor W 1 is the resulting capacity difference, Δ W 2 is the arc suppression coil capacity configured for the section of bus W 0 is the capacity minus the capacity not considering the multiplication factor W 2 is the resulting capacity difference; S303, if the capacity difference Δ W 1 is greater than 0, it is determined that the capacitor current compensation is normal, and the process ends and exits; if the capacity difference Δ W 1 is less than 0 and if the capacity difference Δ W 2 is greater than 0, then if the standby interval number M is equal to 0, it is determined that the capacitor current compensation is normal, and the process ends and exits; otherwise, the process jumps to step S304; S304, if the capacity difference Δ W 1 satisfies |Δ W If 1|>120kVA, a Level 1 warning for excessive capacitor current will be issued. If the capacitance difference Δ W 1 satisfies 120kVA > |Δ W 1|>60kVA, capacitor current exceeds standard, level two warning; if the capacitance difference Δ W 1. Satisfies 60kVA > |Δ W 1| Level 3 warning for excessive capacitor current; End and exit.

8. The substation busbar capacitive current intelligent management and control method according to claim 1, characterized in that, After the step of calculating the theoretical value of the capacitive current of each bus of the low-voltage side of the main transformer, the method further comprises a step of issuing a capacitive current deviation out-of-limit early warning for any one bus: S401, judging the grounding mode of the neutral point of the bus, if grounded through arc suppression coil, jump to step S402, otherwise, jump to step S403; S402, according to the capacitance current theory value I C1 , capacitance current instrument test value I C2 , arc suppression coil controller capacitance current value I C3 Calculate the capacitance current deviation: , and the capacitance current deviation Δ I 1、 Δ I 2 and Δ I 3 among the three maximum values as the capacitance current deviation Δ I C ; Jump to step S404; S403, according to the capacitance current theory value I C1 , capacitance current instrument test value I C2 Calculate Get capacitance current deviation Δ I C ; S404, when Δ I C >30A, a first level of warning is issued for the exceeding of the capacitor current deviation, when 20A < Δ I C ≤30A, a second level of warning is issued for the exceeding of the capacitor current deviation, when 10A < Δ I C ≤20A, a third level of warning is issued for the exceeding of the capacitor current deviation, when Δ I C ≤10A, the capacitor current is determined to be normal.

9. A substation busbar capacitive current intelligent management and control system comprising a microprocessor and a memory connected to each other, characterized in that, The microprocessor is programmed or configured to perform the steps of the substation bus capacitive current intelligent management and control method of any one of claims 1-8.

10. The substation bus capacitive current intelligent management and control system of claim 9, wherein, The microprocessor is also connected with the capacitance current measuring instrument through the data acquisition component or the data communication component to acquire the capacitance current instrument test value obtained by testing the capacitance current measuring instrument I C2 connected with the arc suppression coil controller to acquire the arc suppression coil controller capacitance current value in the arc suppression coil controller operation data I C3 .

11. A computer-readable storage medium having stored therein a computer program, characterized in that, The computer program is used for programming or configuring the microprocessor to perform the steps of the substation bus capacitive current intelligent management and control method of any one of claims 1-8.

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