Intelligent calculation method and system for arc suppression coil compensation of 66-kilovolt system

Abstract

The invention discloses an intelligent calculation method and system for arc suppression coil compensation of a 66-kilovolt system, and the method comprises the steps: naming a 66-kilovolt transformer substation provided with an arc suppression coil according to an actual operation wiring diagram of a power grid; a 66KV bus named as 66KV substation sti is named as # imgabs0 #, a line named as # imgabs1 # of the 66KV substation sti is named as # imgabs2 #, a line named as # imgabs3 # of the 66KV substation sti is named as # imgabs2 #, a line named as # imgabs3 # of an m-type arc suppression coil is named as # imgabs4 #, and a line # imgabs5 # capacitance current calculation model is established; a bus # imgabs6 # capacitor current total model is established; establishing an arc suppression coil # imgabs7 # tap gear information model and an inductive current compensation calculation model; and substituting the line # imgabs8 # capacitance current calculation model, the bus # imgabs9 # capacitance current total calculation model, the arc suppression coil # imgabs10 # tap gear information model and the inductive current compensation calculation model into the system compensation degree calculation model to obtain a compensation degree result of the 66-kilovolt system. According to the invention, tuning data calculation can be realized automatically, quickly and adaptively, and a sufficient basis is provided for regulation and control personnel to dispose arc suppression coil gears.

Description

Technical Field

[0001] The present invention relates to the field of intelligent calculation of arc suppression coil compensation degree, and particularly relates to an intelligent calculation method and system for arc suppression coil compensation in a 66 kV system. Background Art

[0002] For the safe and stable operation of the power grid, the system compensation degree needs to be within a reasonable range to prevent resonance, which may cause unbalanced three-phase voltages or overcurrents and overvoltages. In the 66 kV system of the power grid, all use the neutral point grounded through an arc suppression coil. When the system compensation degree changes due to transmission line outages for inspection, tripping, disconnection of the arc suppression coil, or bus grounding, grid dispatchers need to manually calculate the system tuning data and change the operation mode of the arc suppression coil to ensure that the system compensation degree remains within a reasonable range. Currently, the manual calculation method is mainly based on the calculation of capacitive current, which includes steps such as calculating capacitive current, calculating the inductive current of the arc suppression coil at different tap positions, and calculating the compensation degree. However, grid dispatchers cannot obtain the inductive current data of the arc suppression coil that meets the compensation degree through a single calculation, that is, they cannot calculate the tap position of the arc suppression coil that can meet the compensation degree requirements at one time. This results in a long calculation time, low calculation efficiency, affecting the handling time of accidents and abnormalities, and there is also a risk of calculation errors, which easily causes incorrect adjustment of the system operation mode, and situations such as system resonance and unbalanced three-phase voltages may occur, seriously threatening the safe operation of the power grid. Summary of the Invention

[0003] The purpose of the present invention is to provide an intelligent calculation method and system for arc suppression coil compensation in a 66 kV system, which can automatically calculate compensation data for situations such as changes in the power grid network structure, transmission line outages for inspection, tripping, disconnection of the arc suppression coil, and bus grounding, providing sufficient basis for the dispatching personnel to handle the tap position of the arc suppression coil, solving the problems of long calculation time and low accuracy of manual calculation of tuning data, and effectively maintaining the safe operation of the power grid.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] An intelligent calculation method for arc suppression coil compensation in a 66 kV system includes:

[0006] Naming the 66 kV substation equipped with an arc suppression coil according to the actual operation wiring diagram of the power grid, and setting this substation as st i , setting the name of the 66 kV bus of the named 66 kV substation st i as Setting the name of the lines carried by the 66 kV bus of the named 66 kV substation st i as Setting the name of the m-type arc suppression coil carried by the named 66 kV bus as as the name of the m-type arc suppression coil carried by the named 66 kV bus

[0007] Establish a line Capacitive current calculation model;

[0008] Establish a busbar Total capacitive current model;

[0009] Establish an arc suppression coil Tap position information model and inductive current compensation calculation model;

[0010] Establish a compensation degree calculation model, and substitute the line Capacitive current calculation model, busbar Total capacitive current model, arc suppression coil Tap position information model and inductive current compensation calculation model into the system compensation degree calculation model to obtain the compensation degree result of the 66 kV system.

[0011] Furthermore, establish the 66 kV busbar of the 66 kV substation st i of the 66 kV busbar The capacitive current calculation model of the connected line is:

[0012]

[0013] Among them, represents the capacitive current of the line ; represents the line length of the line ; U p represents the line voltage of the system where the line is located; S n represents the cross-sectional area of the conductor of the line ; n represents the number of the line on the 66 kV busbar B j above ; λ is the proportionality coefficient between the theoretical calculated values of the capacitive currents of overhead lines and cable lines.

[0014] Furthermore, establish the total capacitive current model of the 66 kV busbar B of the 66 kV substation st i is: j

[0015]

[0016] Among them, represents the total capacitive current of the 66 kV busbar B j ; represents the capacitive current of the line; N represents the set of all lines on the busbar B j ; J represents the substation sti The number of busbars.

[0017] Considering the influence of factors such as the grounding of transformer equipment, the metallic shell, and theoretical calculation errors on the capacitive current, the capacitive current calculation model is improved:

[0018]

[0019] Furthermore, an arc suppression coil tap position information model is established as:

[0020]

[0021] Wherein, represents the tap position of the arc suppression coil ; K m is the maximum tap position of the arc suppression coil with a capacity of G m ; the maximum tap position; represents the capacity of the arc suppression coil ; G m represents the capacity of the arc suppression coil of model m.

[0022] An inductive current compensation calculation model of the arc suppression coil is established as:

[0023]

[0024] Wherein, represents the compensated inductive current at the tap position of the arc suppression coil with a capacity of ; the arc suppression coil.

[0025] Furthermore, in the process of establishing the system compensation degree calculation model, under the action of the arc suppression coil, the compensation degree of the 66 kV busbar B i of the 66 kV substation st j is calculated:

[0026]

[0027] Wherein, represents the compensation degree of the 66 kV busbar B i of the 66 kV substation st j ;

[0028] Under the action of the arc suppression coil, the total compensation degree of the 66 kV busbar B i of the 66 kV substation st j operating in parallel with the busbar B j′ is calculated:

[0029]

[0030] Among them, is expressed as the total compensation degree of the 66 kV bus B j in parallel operation with bus B j′ ; is expressed as the inductive current compensated by the arc suppression coil of model m on bus B j′ ; is expressed as the total capacitive current on bus B j′ ;

[0031] Under the action of the arc suppression coil, calculate the N-1 compensation degree of the 66 kV bus B of the 66 kV substation st of the system compensation degree i : j Among them,

[0032]

[0033] is expressed as the N-1 compensation degree of the 66 kV bus B under the condition of power outage of the line j ; is expressed as the capacitive current of the line ; Under the action of the arc suppression coil, calculate the N-1 compensation degree of the 66 kV bus B of the 66 kV substation st of the system compensation degree

[0034] : i Among them, j is expressed as the N-1 compensation degree of the 66 kV bus B j′ in parallel operation with bus B

[0035]

[0036] Among them, is expressed as the N-1 compensation degree of the 66 kV bus B j under the condition of power outage of the line ;

[0037] Furthermore, in step 6, an intelligent calculation method for arc suppression coil compensation based on a 66 kV system uses the Python language to build an intelligent calculation system for arc suppression coil compensation of a 66 kV system. The system architecture is as follows:

[0038] Establish a system main interface module. The system main interface is a power grid wiring diagram, and the wiring diagram includes all 66 kV substations in the local power grid;

[0039] Establish a database storage module. The system stores all 66 kV substation bus data, line data, arc suppression coil account data, 66 kV line capacitive current Data, capacitive current of 66 kV cable line Integrate and package the data;

[0040] Establish a database query and modification module. Click on a 66 kV substation on the main interface to enter the compensation degree calculation interface of this substation. This interface can view the bus parameters, lines parameters, capacitive current data, arc suppression coil input status. Various information such as line name, capacitive current, line commissioning and wiring status can be added, deleted, modified and edited on this interface;

[0041] Click on the arc suppression coil option on the compensation degree calculation interface to enter the tap information interface of this arc suppression coil, and the capacity of this arc suppression coil can be viewed of the arc suppression coil tap positions and the corresponding compensated inductive current magnitude;

[0042] Establish a compensation degree intelligent calculation module. On the compensation degree calculation interface, the tap position of the arc suppression coil can be selected through the drop-down menu of the arc suppression coil where, when it means the arc suppression coil is not put into operation. After the tap position of the arc suppression coil is changed, the corresponding compensated inductive current value also changes accordingly.

[0043] The compensation degree intelligent calculation module automatically calculates and displays the bus B j compensation degree and N-1 compensation degree of bus B j′ compensation degree and N-1 compensation degree B j and B j′ parallel operation compensation degree and parallel operation N-1 compensation degree

[0044] Grid dispatching personnel select the operating state of the arc suppression coil that best meets the current grid network requirements by viewing the compensation degree information. When the grid network structure changes, grid dispatching personnel can modify it through the database query and modification module and achieve the tuning requirements by changing the input status of the arc suppression coil.

[0045] The beneficial effects of the present invention are as follows: A method and system for intelligent calculation of arc suppression coil compensation in a 66 kV system provided by the present invention are mainly applied to the calculation scenario of compensation data for power grid systems with arc suppression coils grounded at the neutral point by dispatching personnel. It can automatically, quickly, and adaptively calculate tuning data for situations such as changes in the power grid network structure, outage inspection of transmission lines, tripping, disconnection of arc suppression coils, and bus grounding, providing sufficient basis for dispatching personnel to handle the arc suppression coil tap positions, enabling the total capacitive current and the inductive current compensated by the arc suppression coil to meet the compensation degree requirements, and ensuring that the compensation degree of the system remains within a reasonable range. It solves problems such as long time-consuming and low accuracy in manual calculation of tuning data, effectively maintains the safe operation of the power grid, and is of great significance to the safe operation of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0047] Figure 1 It is a flowchart of a method for intelligent calculation of arc suppression coil compensation in a 66 kV system;

[0048] Figure 2 It is a framework diagram of a system for intelligent calculation of arc suppression coil compensation in a 66 kV system. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0050] The purpose of the present invention is to provide a method, system, and device for intelligent calculation of arc suppression coil compensation in a 66 kV system, which can automatically, quickly, and adaptively calculate tuning data for situations such as changes in the power grid network structure, outage inspection of transmission lines, tripping, disconnection of arc suppression coils, and bus grounding, providing sufficient basis for dispatching personnel to handle the arc suppression coil tap positions, and solving problems such as long time-consuming and low accuracy in manual calculation of tuning data, effectively maintaining the safe operation of the power grid.

[0051] As Figure 1 and Figure 2 shown, a method for intelligent calculation of arc suppression coil compensation in a 66 kV system provided in this embodiment includes the following steps:

[0052] Step 1: Name the 66 kV substation equipped with an arc suppression coil according to the actual operation wiring diagram of the Jinzhou Harbor 66 kV system, and set this substation as st i , and set the name of the 66 kV substation st i of the 66 kV busbar as , and set the name of the 66 kV busbar of the 66 kV substation st i as the name of the line it supplies as Set the name of the 66 kV busbar equipped with the m-type arc suppression coil as

[0053] Step 2: Establish a calculation model for the capacitive current of the line ;

[0054] Step 3: Establish a total capacitive current calculation model for the busbar ;

[0055] Step 4: Establish a tap position information model and an inductive current compensation calculation model for the arc suppression coil ;

[0056] Step 5: Establish a system compensation degree calculation model, and substitute the capacitive current calculation model of the line , the total capacitive current calculation model of the busbar , the tap position information model and the inductive current compensation calculation model of the arc suppression coil into the system compensation degree calculation model to obtain the compensation degree result of the 66 kV system.

[0057] In the above Step 2, set the name of the line supplied by the 66 kV busbar of the 66 kV substation st i as The calculation model for the capacitive current of the line supplied by the 66 kV busbar of the 66 kV substation st i is as follows: The line supplied by the 66 kV busbar

[0058]

[0059] where represents the capacitive current of the line ; represents the line length of the line ; U p represents the line voltage of the system where the line is located; S n represents the cross-sectional area of the conductor of the line ; n represents the 66 kV busbar Bj Upper The number of the line; λ is the proportionality coefficient of the theoretical calculated value of the capacitive current of the overhead line and the cable line, and the proportionality coefficient = 0.01.

[0060] In the step 3, establish the capacitive current total model of the 66 kV bus B i of the 66 kV substation st j as:

[0061]

[0062] Among them, represents the total capacitive current of the 66 kV bus B j ; represents the capacitive current of the line; N represents all the line sets on the bus B j ; J represents the number of buses of the substation st i .

[0063] Considering the influence of factors such as transformer equipment grounding, metal shell, and theoretical calculation error on the capacitive current, improve the capacitive current calculation model:

[0064]

[0065] In the step 4, set the name of the arc suppression coil with the m model carried by the named 66 kV bus as Establish the tap position information model of the arc suppression coil as:

[0066]

[0067] Among them, represents the tap position of the arc suppression coil ; K m is the maximum tap position of the arc suppression coil with a capacity of G m ; represents the capacity of the arc suppression coil ; G represents the capacity of the m model arc suppression coil. m

[0068] Establish the inductive current compensation calculation model of the arc suppression coil as:

[0069]

[0070] Among them, represents the arc suppression coil with a capacity of ; Inductive current compensated at a certain gear

[0071] In step 5, under the action of the arc suppression coil, calculate the system compensation degree of the 66 kV substation st i of the 66 kV bus B j of the compensation degree:

[0072]

[0073] wherein, is expressed as the compensation degree of the 66 kV bus B i of the 66 kV substation st j of the compensation degree.

[0074] Under the action of the arc suppression coil, calculate the system compensation degree of the 66 kV substation st i of the 66 kV bus B j and the total compensation degree of the bus B j′ operating in parallel:

[0075]

[0076] wherein, is expressed as the total compensation degree of the 66 kV bus B j and the bus B j′ operating in parallel; is expressed as the inductive current compensated by the m-type arc suppression coil on the bus B j′ ; is expressed as the total capacitive current on the bus B j′ .

[0077] Under the action of the arc suppression coil, calculate the system compensation degree of the 66 kV substation st i of the 66 kV bus B j of the N-1 compensation degree:

[0078]

[0079] wherein, is expressed as the N-1 compensation degree of the 66 kV bus B j in the case of the line being powered off; is expressed as the capacitive current of the line .

[0080] Under the action of the arc suppression coil, calculate the system compensation degree of the 66 kV substation st i of the 66 kV bus B j and the bus B j′ operating in parallel of the N-1 compensation degree:

[0081]

[0082] Among them, is represented as the 66 kV bus B j in the line the N-1 compensation degree under power outage conditions.

[0083] An intelligent calculation method for arc suppression coil compensation based on a 66 kV system uses the Python language to build an intelligent calculation system for arc suppression coil compensation of a 66 kV system. The system architecture is as follows:

[0084] Establish a system main interface module. The system main interface is a power grid connection diagram, and the connection diagram includes all 66 kV substations in the local power grid;

[0085] Establish a database storage module. The system integrates and packages all data of the 66 kV substation buses data, lines data, arc suppression coils account data, 66 kV line capacitive current data, 66 kV cable line capacitive current data;

[0086] Establish a database query and modification module. Click on a 66 kV substation on the main interface to enter the compensation degree calculation interface of this substation. This interface can view the bus parameters, lines parameters, capacitive current data, arc suppression coils input status, and various information such as line name, capacitive current, line commissioning and wiring status can be added, deleted, modified, and edited on this interface;

[0087] Click on the arc suppression coil option on the compensation degree calculation interface to enter the tap information interface of this arc suppression coil, and the capacity of this arc suppression coil can be viewed of gear and the compensation inductive current corresponding to the gear magnitude; The compensation degree calculation interface of the intelligent calculation system for arc suppression coil compensation of a 66 kV system is as follows:

[0088]

[0089] Establish a compensation degree intelligent calculation module. On the compensation degree calculation interface, the gear of the arc suppression coil to be put into operation can be selected through the drop-down gear menu of the arc suppression coil. Among them, when it means that the arc suppression coil is not put into operation. After the gear of the arc suppression coil is changed, the corresponding compensation inductive current value also changes accordingly.

[0090] The intelligent compensation degree calculation module automatically calculates and displays the bus B on the compensation degree calculation interface according to Step 5 j Compensation degree and N-1 compensation degree Bus B j′ Compensation degree and N-1 compensation degree B j and B j′ Parallel operation compensation degree and parallel operation N-1 compensation degree

[0091] Grid dispatching personnel select the most suitable arc suppression coil operating state for the current grid network structure by viewing the compensation degree information. When the grid network structure changes, grid dispatching personnel can use the database query and modification module to make modifications, and achieve the tuning requirements by changing the input situation of the arc suppression coil. The calculation results are as follows:

[0092]

[0093] The wiring situation of the processed GW substation in a certain area shown on the compensation degree calculation interface is as follows:

[0094]

[0095] Operators can manually modify the capacitive current value of a certain line to indicate whether the line is in operation. For example, if the GS#1 line is out of service for maintenance, the corresponding capacitive current value of GS#1 is set to zero. At this time, the arc suppression coil tap operation options of this substation and the compensation degree calculation results of this substation are as follows:

[0096]

[0097] When the GS#1 line is out of service for maintenance, the compensation degree of this bus changes. At this time, the dispatching personnel can pull down the arc suppression coil tap menu of the TD substation to adjust the arc suppression coil tap to change the compensation inductive current, ensuring that the compensation degree of the first bus of the GW substation is within a reasonable range.

[0098] The above tuning calculation process is fast, accurate, and efficient, and can provide sufficient basis for the dispatching and control personnel to handle the arc suppression coil tap work in a short time, solving the problems of long time consumption and low accuracy in manual calculation of tuning data, and is of great significance to the safe operation of the power grid.

[0099] The above are only specific embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An intelligent calculation method for arc suppression coil compensation in a 66 kV system, characterized in that, Including: Name the 66-kV substation equipped with arc suppression coils according to the actual operation wiring diagram of the power grid, and name the substation st i , name the 66-kV substation st i The name of the 66-kV busbar of Name the 66-kV busbar of the 66-kV substation st i The name of the lines carried by the 66-kV busbar is Name the 66-kV busbar The name of the arc suppression coil of model m carried by it is Establish a circuit Capacitive current calculation model; Establish a busbar Total capacitance current model; Arc suppression coil establishment Tap position information model and inductive current compensation calculation model; Establish a system compensation degree calculation model, and substitute the line capacitance current calculation model, bus total capacitance current model, arc suppression coil tap position information model and inductive current compensation calculation model into the system compensation degree calculation model to obtain the compensation degree result of the 66 kV system.

2. The circuit capacitance current calculation model established according to claim 1, wherein The establishment of the 66 kV substation st i The 66 kV busbar The lines it supplies The capacitive current calculation model is as follows: Among them, represents the capacitive current of line ; represents the line length of line ; U p represents the line voltage of the system where line is located; S n represents the cross-sectional area of the conductor of line ; n represents the number of the line j on the 66 kV busbar B; λ is the proportionality coefficient between the theoretical calculated values of the capacitive currents of overhead lines and cable lines.

3. The method for establishing a total busbar capacitance current model according to claim 1, wherein Establish a 66 kV substation st i The 66 kV bus B j The total capacitance current model is as follows: Among them, represents the total capacitive current of the 66 kV bus B j ; is represented as the capacitive current of the line; N represents all the line sets on the bus B j ; J represents the number of buses of the substation st i ; Considering the influence of the grounding of transformer equipment, the metallic shell, and the theoretical calculation error factors on the capacitive current, the capacitive current total model is improved:

4. The method for establishing an arc suppression coil tap position information model and an inductive current compensation calculation model according to claim 1, wherein Establishing an arc suppression coil The tap position information model is as follows: Among them, represents the tap position of the arc suppression coil ; K m is the arc suppression coil with a capacity of G m ; is the maximum tap position of the arc suppression coil represents the capacity of the arc suppression coil ; G m represents the capacity of the arc suppression coil of model m Establish an arc suppression coil The inductive current compensation calculation model is as follows: Among them, is expressed as the arc suppression coil with a capacity of and the inductive current compensated at the tap. ​ 5. The system compensation degree calculation model established according to claim 1, characterized in that Under the action of the arc suppression coil, calculate the system compensation degree of the 66 kV substation st i for the 66 kV bus B j The compensation degree calculation model is as follows: Among them, is expressed as the 66 kV substation st i of the 66 kV bus B j compensation degree; Under the action of the arc suppression coil, calculate the system compensation degree of the 66 kV substation st i of the 66 kV bus B j and the total compensation degree of the bus B j′ operating in parallel: Among them, is expressed as the total compensation degree of the 66 kV busbar B j in parallel operation with busbar B j′ ; is expressed as the inductive current compensated by the arc suppression coil of model m on busbar B j′ ; is expressed as the total capacitive current on busbar B j′ . Under the action of the arc suppression coil, calculate the system compensation degree of the 66 kV substation st i of the 66 kV bus B j N-1 compensation degree: Among them, is expressed as the 66 kV bus B j in the line N-1 compensation degree under the power outage condition; is expressed as the line capacitive current; Under the action of the arc suppression coil, calculate the system compensation degree of the 66 kV substation st i of the 66 kV bus B j and the N-1 compensation degree of the bus B j′ operating in parallel: Among them, is expressed as the 66 kV bus B j in the line N-1 compensation degree under power outage conditions.

6. The arc suppression coil compensation intelligent calculation system for building a 66 kV system according to claim 1, wherein Using the Python language to build the arc suppression coil compensation intelligent calculation system for the 66 kV system, the system architecture is: The system main interface module, the system main interface is the power grid connection diagram, and the connection diagram includes all 66 kV substations in the local power grid; Database storage module, the system integrates and packages all the data of the 66 kV substation busbars data, lines data, arc suppression coils inventory data, capacitive current of 66 kV lines data, capacitive current of 66 kV cable lines data; Database query and modification module. Click on a 66 kV substation on the main interface to enter the compensation degree calculation interface of the substation. This interface can view the bus parameters, line parameters, capacitive current data, arc suppression coil input status. Information such as line name, capacitive current, line commissioning and wiring status can be added, deleted, modified and edited on this interface; Compensation degree calculation interface. Click on the arc suppression coil option in the compensation degree calculation interface to enter the tap information interface of the arc suppression coil, where you can view the capacity tap and the compensation inductive current corresponding to the tap magnitude; The intelligent compensation degree calculation module can select the arc suppression coil gear to be put into through the drop-down gear menu on the compensation degree calculation interface. Among them, when it indicates that the arc suppression coil is not put into; after the gear of the arc suppression coil is changed, the corresponding compensated inductive current value also changes accordingly; ​ Intelligent Compensation Degree Calculation Interface, which automatically calculates and displays the compensation degree of bus B using the intelligent compensation degree calculation module j Compensation Degree and N-1 Compensation Degree Bus B j′ Compensation Degree and N-1 Compensation Degree B j and B j′ Parallel Operation Compensation Degree and Parallel Operation N-1 Compensation Degree

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