Method for automatically calculating gear of arc suppression coil in power dispatching ticket

Abstract

The invention discloses a method for automatically calculating the gear of an arc suppression coil in a power dispatching ticket, and the method comprises the steps: receiving a dispatching order, and storing the name of the arc suppression coil according to the dispatching order; according to the name of the arc suppression coil, searching the name of a corresponding transformer substation in a power grid operation mode database in a certain region, obtaining various data values in the circuit, calculating the capacitance current of the arc suppression coil by using the data values, obtaining the compensation degree according to the capacitance current of the arc suppression coil, and completing the optimal optimization of the circuit; the purposes of adjusting the gear of the arc suppression coil through the optimal target value, being safe and reliable, being high in data utilization rate and improving the working efficiency are achieved.

Description

Technical Field

[0001] The present invention belongs to the field of electronic information technology, and in particular relates to a method and system for automatically calculating arc suppression coil gear positions in electric power dispatch tickets. Background Art

[0002] In substations, the 35kV and 66kV sides typically use ungrounded grounding, neutral point grounding via a small resistor, high resistor, or arc suppression coil. Systems with pure arc suppression coils and arc suppression coils combined with a small resistor are more commonly used. In practice, the constant changes in system operation require the arc suppression coils to be constantly switched to adapt to the changing capacitive current in the system, ensuring that the system provides the appropriate inductive current to extinguish the arc when a single-phase ground fault occurs. Currently, most arc suppression coil devices adjust their positions based on system current and voltage parameters, leading to inaccurate calculations and even device anomalies, resulting in bus voltage deviations and the need for recalculation.

[0003] The dispatch order is written by the dispatcher, who actually writes the dispatch instructions item by item and the whole, in text format, in Chinese characters; for example: Task name: System switching, 1. Lingshui transformer: Close the seawater left line switch; 2. Haiwan transformer: Open the seawater right line switch; 3. Haiwan transformer: Adjust the #1 arc suppression coil tap position to the "" position; 4. Dalian transformer: Close the seawater right line switch; 5. Haiwan transformer: Open the seawater right line switch; 6. Dalian transformer: Adjust the #2 arc suppression coil tap position to the "" position, the gear in the quotation marks is a number, which is the value we need to solve. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem in the prior art that most arc suppression coil devices currently adjust the gear position through parameter values ​​such as system current and voltage, which may result in inaccurate calculations or even abnormalities in the device, causing bus voltage deviation and the need for recalculation.

[0005] In order to solve the above problems, the present invention provides a method for automatically calculating the arc suppression coil gear position in a power dispatch ticket, comprising the following steps:

[0006] S1: Receive dispatch order;

[0007] Determine whether there is a switch-on / off dispatch order in the dispatch order. Only the switch-on / off is related to the operation mode. If there is a reassignment of the interval switch quantity according to the switch-on / off dispatch order to change the circuit operation mode, the change in operation mode will cause the capacitance current of the power system where the arc suppression coil is located to change. The capacitance current change is accompanied by the change of the gear position of the arc suppression coil. At the same time, the name of the arc suppression coil is saved.

[0008] S2: query of numerical values;

[0009] According to the name of the arc suppression coil obtained in step S1, the name of the corresponding substation is found in the database of the power grid operation mode of a certain region. According to the substation name, the C value of the bus tie switch position of the voltage level is queried, which intervals in the arc suppression coil system are in operation and their capacitive currents are queried, and whether there is a system that transmits the capacitive current of the opposite substation and its opposite arc suppression coil system. Then, the formula in step S3 is used to calculate and obtain the capacitive current of the arc suppression coil system.

[0010] S3: Calculate the arc suppression coil capacitance current. The calculation formula is as follows:

[0011]

[0012] Where HW#1 represents the capacitive current of the HW substation #1 system, R11 represents whether the #1 system operates in the I mother system, R12 represents whether the #1 system operates in the II mother system, Sn1 represents the operating position of the n feeders, and in the I mother, the value is 1, Kn represents the capacitive current of the nth feeder, S DYHW1 Indicates whether the HW substation power line is running in the I mother system. Generally, the value is 0. DYHW2 Indicates whether the HW substation power line is running in the II mother system. Generally, the value is 0. DY1 Indicates whether the power line is running in the I mother system of the opposite substation, S DY2 Indicates whether the power line is running in the II mother system of the opposite substation, HC #1 Indicates the net capacitance current of the I bus system of the opposite substation minus the corresponding arc suppression coil compensation, HC #2 Indicates the net capacitance current of the bus system of the opposite substation II, which is the amount minus the corresponding arc suppression coil compensation. C indicates whether the bus coupling of the HW substation is in the closed position. When in the closed position, C = 1.

[0013] S3-1: The capacitor current calculation formula is generated as follows:

[0014]

[0015] In the formula, R11 and R12 represent whether the arc suppression coil operates in the I mother system or the II mother system, K represents the capacitive current of the feeder, Sn1 indicates whether feeder n operates in the I mother system, and R11S11K1 represents whether feeder 1 provides capacitive current for the arc suppression coil. Only when R11 and S11 are both met can the capacitive current of the feeder be guaranteed to be in the same system as the arc suppression coil. The following variables are added:

[0016] S DYHW1 (S DY1 ·HC #1 +S DY2 ·HC #2 )

[0017] This formula indicates that when the power line is enabled and the system is running in the R11 system, the system capacitance current flow on the opposite side needs to be added. SDY1 and SDY2 are the buses where the opposite side line is running when it is used as a power source. Logical operations are performed with the corresponding capacitance currents. Finally, the capacitance current of the opposite side system is added to the calculation. The formula is as follows:

[0018]

[0019] Where n represents the number of feeders in the substation system being calculated. Similarly, when calculating the second arc suppression coil, n feeders and power lines must also be calculated and stored in an array. C represents when the bus tie breaker of the substation is in the open position. C = 0, and 1-C = 1 is equivalent to a logical 1.

[0020]

[0021] This formula indicates that when the bus tie breaker is in the closed position, the capacitance current value is the sum of all feeders on the two busbars. In particular, when there is a power line on the busbar, the capacitance current value of the system where the substation on the opposite side of the power line is located needs to be added.

[0022] S4: Calculate the compensation degree T. The specific formula is as follows:

[0023]

[0024] Where IL represents the inductive current provided by the arc suppression coil, and IC represents the capacitive current HW#1 of the arc suppression coil. In a fixed operating mode, IC is a fixed value, and the IL value is obtained by traversing each gear of the arc suppression coil. The compensation degree T is calculated once for each cycle. If the compensation degree reaches the target range, the loop is exited in time, and the gear value and compensation degree T are saved as output. If the target range value cannot be obtained after the cycle ends, it indicates that the arc suppression coil capacity is insufficient.

[0025] When the arc suppression coil is in position 1, the IL value is 50, while the calculated Ic is 100. Thus, the T value is -50%, and our target value is 20%. Continuing the loop, when the position is 2, the IL value is 70, and the T value is -30%. When the position is 9, assuming the IL value is 120, then T = 20%, meeting the requirement. Therefore, the position is 9, and the compensation T is 20%, meeting the specification. The position and IL values ​​have a one-to-one correspondence and need to be obtained through table lookup; this is a constant.

[0026] In the preferred mode, the compensation degree is the optimal target, and the adjustment of the compensation degree ultimately depends on the gear adjustment of the arc suppression coil. In actual operation, the executor obtains the optimal compensation degree by adjusting the gear of the arc suppression coil.

[0027] The beneficial effects of the present invention are as follows: starting from the actual operating mode of the system, the capacitance current of the specified arc suppression coil system is first calculated, then the optimal target value is passed, and finally the arc suppression coil gear position is adjusted. The working process has the advantages of safety, reliability, high data utilization, and improved work efficiency. The present invention adopts a combination and application of query logic variables and unified formulas, making the system suitable for complex operating mode changes, suitable for double busbar, single busbar, and single busbar segmented wiring forms. A set of programs can solve the arc suppression coil calculation problems of most substations. The calculation formula is highly integrated, accurate, and maintenance-free. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the 66kV / 35kV system structure of the present invention;

[0029] Figure 2 Schematic diagram of the switch value according to the change of the power grid operation mode of the present invention;

[0030] Figure 3 This is a schematic diagram of the logical framework for implementing the system of the present invention. DETAILED DESCRIPTION

[0031] Example 1:

[0032] like Figure 1 As shown in the figure, there are two systems connected by the left and right Haihua lines. This system stores the changing operating mode as a variable and automatically calls it when calculating the arc suppression coil. When the operating state changes, such as when the switch scheduling instruction is opened or closed, the system is activated and the arc suppression coil calculation is performed. The change of operating state includes the opening and closing of the feeder switch, bus tie switch and knife switch, and the two systems are paralleled by the power connection line.

[0033] like Figure 2 As shown, the numerical value of the system specifically refers to the position of the switch and the knife switch: 0 or 1. These two numerical values ​​will change with the change of the operating mode, thereby automatically activating the gear calculation of the arc suppression coil when the scheduling instruction ticket is proposed. The most basic calculation of the arc suppression coil is the system capacitance current where the arc suppression coil system is located, and the capacitance current has been calculated and tested when the line is put into operation. The complexity of calculating the capacitance current lies in the change of the operating mode. The present invention constructs a data model of the system capacitance current operating mode, forms a complete formula through the variables in the table, and calculates the capacitance current by polling the database.

[0034] The specific steps are as follows:

[0035] S1: Receive dispatch order;

[0036] Determine whether there is a switch-on / off dispatch order in the dispatch order. Only the switch-on / off is related to the operation mode. If there is a reassignment of the interval switch quantity according to the switch-on / off dispatch order to change the circuit operation mode, the change in operation mode will cause the capacitance current of the power system where the arc suppression coil is located to change. The capacitance current change is accompanied by the change of the gear position of the arc suppression coil. At the same time, the name of the arc suppression coil is saved.

[0037] S2: query of numerical values;

[0038] According to the name of the arc suppression coil obtained in step S1, the name of the corresponding substation is found in the database of the power grid operation mode of a certain region. According to the substation name, the C value of the bus tie switch position of the voltage level is queried, which intervals in the arc suppression coil system are in operation and their capacitive currents are queried, and whether there is a system that transmits the capacitive current of the opposite substation and its opposite arc suppression coil system. Then, the formula in step S3 is used to calculate and obtain the capacitive current of the arc suppression coil system.

[0039] S3: Calculate the arc suppression coil capacitance current. The calculation formula is as follows:

[0040]

[0041] Where HW#1 represents the capacitive current of the HW substation #1 system, R11 represents whether the #1 system operates in the I mother system, R12 represents whether the #1 system operates in the II mother system, Sn1 represents the operating position of the n feeders, and in the I mother, the value is 1, Kn represents the capacitive current of the nth feeder, S DYHW1 Indicates whether the HW substation power line is running in the I mother system. Generally, the value is 0. DYHW2 Indicates whether the HW substation power line is running in the II mother system. Generally, the value is 0. DY1 Indicates whether the power line is running in the I mother system of the opposite substation, S DY2 Indicates whether the power line is running in the II mother system of the opposite substation, HC #1 Indicates the net capacitance current of the I bus system of the opposite substation minus the corresponding arc suppression coil compensation, HC #2 Indicates the net capacitance current of the bus system of the opposite substation II, which is the amount minus the corresponding arc suppression coil compensation. C indicates whether the bus coupling of the HW substation is in the closed position. When in the closed position, C = 1.

[0042] S3-1: The capacitor current calculation formula is generated as follows:

[0043]

[0044] In the formula, R11 and R12 represent whether the arc suppression coil operates in the I mother system or the II mother system, K represents the capacitive current of the feeder, Sn1 indicates whether feeder n operates in the I mother system, and R11S11K1 represents whether feeder 1 provides capacitive current for the arc suppression coil. Only when R11 and S11 are both met can the capacitive current of the feeder be guaranteed to be in the same system as the arc suppression coil. The following variables are added:

[0045] S DYHW1 (S DY1 ·HC #1 +S DY2 ·HC #2 )

[0046] This formula indicates that when the power line is enabled and the system is running in the R11 system, the system capacitance current flow on the opposite side needs to be added. SDY1 and SDY2 are the buses where the opposite side line is running when it is used as a power source. Logical operations are performed with the corresponding capacitance currents. Finally, the capacitance current of the opposite side system is added to the calculation. The formula is as follows:

[0047]

[0048] Where n represents the number of feeders in the substation system being calculated. Similarly, when calculating the second arc suppression coil, n feeders and power lines must also be calculated and stored in an array. C represents when the bus tie breaker of the substation is in the open position. C = 0, and 1-C = 1 is equivalent to a logical 1.

[0049]

[0050] This formula indicates that when the bus tie breaker is in the closed position, the capacitance current value is the sum of all feeders on the two busbars. In particular, when there is a power line on the busbar, the capacitance current value of the system where the substation on the opposite side of the power line is located needs to be added.

[0051] S4: Calculate the compensation degree T. The specific formula is as follows:

[0052]

[0053] Where IL represents the inductive current provided by the arc suppression coil, and IC represents the capacitive current HW#1 of the arc suppression coil. In a fixed operating mode, IC is a fixed value, and the IL value is obtained by traversing each gear of the arc suppression coil. The compensation degree T is calculated once for each cycle. If the compensation degree reaches the target range, the loop is exited in time, and the gear value and compensation degree T are saved as output. If the target range value cannot be obtained after the cycle ends, it indicates that the arc suppression coil capacity is insufficient.

[0054] When the arc suppression coil is in position 1, the IL value is 50, while the calculated Ic is 100. Thus, the T value is -50%, and our target value is 20%. Continuing the loop, when the position is 2, the IL value is 70, and the T value is -30%. When the position is 9, assuming the IL value is 120, then T = 20%, meeting the requirement. Therefore, the position is 9, and the compensation T is 20%, meeting the specification. The position and IL values ​​have a one-to-one correspondence and need to be obtained through table lookup; this is a constant.

[0055] The compensation degree is the optimal target. The adjustment of the compensation degree ultimately depends on the gear adjustment of the arc suppression coil. In actual operation, the executor obtains the optimal compensation degree by adjusting the gear of the arc suppression coil.

[0056] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can still be modified or replaced by equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for automatically calculating the arc suppression coil position in a power dispatch ticket, characterized in that: The following steps are involved: S1: receiving dispatch order; Determine whether there is a switch-on and switch-off dispatch order in the dispatch order. Only the switch-on and switch-off are related to the operation mode. If there is a re-assignment of the interval switch quantity according to the switch-on and switch-off dispatch order to change the circuit operation mode, the change in operation mode will cause the change of the capacitance current of the power system where the arc suppression coil is located. The change of capacitance current is accompanied by the change of the gear position of the arc suppression coil. At the same time, the name of the arc suppression coil is saved; S2: query of numerical value; According to the name of the arc suppression coil obtained in step S1, the name of the corresponding substation is found in the power grid operation mode database of a certain area. According to the name of the substation, the C value of the bus tie switch position of the voltage level is queried, which intervals under the arc suppression coil system are in operation and their capacitive currents are queried, whether there is a system that sends the capacitive current of the opposite substation and its arc suppression coil system on the opposite side, and then the formula in step S3 is used for calculation to obtain the capacitive current of the arc suppression coil system; S3: Calculate the arc suppression coil capacitance current. The calculation formula is as follows: Where HW#1 represents the capacitive current of the HW substation #1 system, R11 represents whether the #1 system is operating in the I mother system, R12 represents whether the #1 system is operating in the II mother system, Sn1 represents the operating position of the traversed n feeders, and in the I mother, the value is 1, Kn represents the capacitive current of the nth feeder, S DYHW1 Indicates whether the HW substation power line is running in the I mother system. Generally, the value is 0. DYHW2 Indicates whether the HW substation power line is running in the II mother system. Generally, the value is 0. DY1 Indicates whether the power line is running in the I mother system of the opposite substation, S DY2 Indicates whether the power line is running in the II mother system of the opposite substation, HC #1 It indicates the net capacitance current of the I mother system of the opposite substation minus the corresponding arc suppression coil compensation. #2 It indicates the net capacitance current of the bus system II of the opposite substation, which is minus the corresponding arc suppression coil compensation. C indicates whether the bus coupling of the HW substation is in the closed position. When in the closed position, C = 1. S3-1: The capacitor current calculation formula is generated as follows: In the formula, R11 and R12 represent whether the arc suppression coil operates in the I mother system or the II mother system, K represents the capacitive current of the feeder, Sn1 indicates whether feeder n operates in the I mother system, and R11S11K1 represents whether feeder 1 provides capacitive current for the arc suppression coil. Only when R11 and S11 are satisfied can the capacitive current of the feeder be guaranteed to be in the same system as the arc suppression coil. The following variables are added: S DYHW1 (S DY1 ·HC #1 +S DY2 ·HC #2 ) This formula indicates that when the power line is enabled and the system is running in the R11 system, the system capacitor current flow on the opposite side needs to be added. SDY1 and SDY2 are the buses where the line on the opposite side runs when it is used as a power source, and logical operations are performed with the corresponding capacitor currents. Finally, the system capacitor current on the opposite side is added to the calculation. The formula is as follows: In the formula, n represents the number of feeders of the calculated substation system. Similarly, when calculating the second or the second arc suppression coil, n feeders and power lines must also be calculated and stored in the array. C represents when the bus tie switch of the substation is in the open position, C = 0, and 1-C = 1 is equivalent to logic 1; This formula indicates that when the bus tie switch is in the closed position, the capacitance current value is the sum of all feeders on the two busbars. In particular, when there is a power line on the busbar, the capacitance current value of the system where the substation on the opposite side of the power line is located needs to be added. S4: Calculate the compensation degree T. The specific formula is as follows: Wherein, IL represents the inductive current provided by the arc suppression coil, IC represents the capacitive current HW#1 of the arc suppression coil. Under the fixed operation mode, IC is a fixed value, and the IL value is obtained by traversing each gear of the arc suppression coil. The compensation degree T is calculated once for each cycle. If the compensation degree reaches the target range, the cycle is exited in time, and the gear value and compensation degree T are saved as output. If the target range value cannot be obtained after the cycle ends, it indicates that the capacity of the arc suppression coil is insufficient. When the arc suppression coil is in position 1, the IL value is 50, and the calculated Ic is 100, so the T value is -50%, and our target value is 20%. So continue the cycle, when the position is 2, the IL value is 70, and the T value is -30%. When the position is 9, assuming that the IL is 120, then T = 20%, which meets the requirements. Then the position is 9, and the compensation degree T is 20%, which meets the specifications. The position and IL values ​​are in a one-to-one correspondence, which needs to be obtained by looking up the table. This is a constant.

2. The method for automatically calculating the arc suppression coil position in the power dispatch ticket according to claim 1 is characterized in that: The compensation degree is the optimal target. The adjustment of the compensation degree ultimately depends on the gear adjustment of the arc extinguishing coil. In actual operation, the executor obtains the optimal compensation degree by adjusting the gear of the arc extinguishing coil.

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