CN113258570A - Switching method and device for self-rotating power function of 10kV power distribution network line - Google Patents
Switching method and device for self-rotating power function of 10kV power distribution network line Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
- H02J13/0004—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers involved in a protection system
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention belongs to the technical field of power distribution networks. The invention provides a method and a device for switching on and off a self-rotating function of a 10kV power distribution network line, wherein the method comprises the following steps: acquiring related information of a line; according to the related information of the line, historical highest load current of two switches positioned at two ends of a fault section in the line in a preset time period and real-time load current at the moment before the fault occurs are respectively obtained; if the sum of the historical highest load currents of the two switches and the sum of the real-time load currents are not more than the maximum current-carrying capacity of the preset line, connecting the switches to perform action judgment of the self-generating function; otherwise, the contact switch quits the action judgment of the self-rotating function; and if the rotation function action conditions are met, generating a corresponding rotation function action instruction. According to the invention, the historical highest load current and the real-time load current are taken as criteria, the self-rotation function is intelligently switched on or switched off according to specific line conditions, and the problem of data distortion is avoided.
Description
Technical Field
The application belongs to the technical field of power distribution networks, and particularly relates to a switching method and a switching device for a 10kV power distribution network line self-rotating power function.
Background
Feeder automation refers to the function of automatically isolating a fault section line and automatically recovering power supply of a non-fault section line when a 10kV power distribution network line has a fault. The 10kV power distribution network line self-rotation function refers to a function of automatically switching a power grid user to a 10kV line serving as a standby power supply for power supply when the 10kV line serving as a main power supply has power failure due to a fault, so that the power failure of the user is avoided, and the function is called the self-rotation function for short, and belongs to one of feeder automation functions. The self-rotating power function is an important function for rapidly recovering the power supply of the line at the non-fault section after the fault of the 10kV power distribution network line is isolated, and can improve the reliability of the power supply and the benefit of the operation of the power grid. Although the conventional self-rotating power supply can ensure the quick power restoration of a non-fault user of a power grid and improve the power supply reliability of the power grid, the power supply system has the following defects:
1. whether or not to invest is determined by historical load data of a line, and data is not load data in the latest period of time, and data distortion may occur. If the line load in the near period of time is greatly increased, after the self-generating function acts, the line serving as a standby power supply is possibly overloaded;
2. whether the input is determined according to whether overload is caused after the load of the whole line is transferred, and the condition that the transfer is possible to be transferred only by partial lines is not considered;
3. after a line breaks down or when the operation mode of the 10kV line is adjusted, a distribution network dispatcher can only inform distribution operation and maintenance personnel to arrive at the site within a certain time to put in or quit the self-rotation function, the self-rotation function cannot be put in or out in real time, and the working efficiency is affected.
Therefore, a more optimized, more intelligent and automatically adjustable switching method for the self-rotating power function of the 10kV power distribution network line is needed.
Disclosure of Invention
In view of the above, the present application is directed to solve the problem that the conventional spinning function determines the input of the spinning function according to the historical load current and the loads of all lines, and thus line overload may occur.
In order to solve the technical problem, a first aspect of the present application provides a method for switching on and off a 10kV distribution network line from a rotating power function, including the following steps:
acquiring relevant information of a line, wherein the relevant information of the line comprises a real-time current value of an in-station switch at a preset moment, a historical highest current value in a preset time period, a switch position of each off-station switch, a real-time current value of each off-station switch at the preset moment, a historical highest current value in the preset time period and a voltage value of each line;
according to the related information of the line, historical highest load current of two switches positioned at two ends of a fault section in the line in a preset time period and real-time load current at the moment before the fault occurs are respectively obtained;
if the sum of historical highest load currents of the two switches positioned at the two ends of the fault section in a preset time period is not greater than the maximum current-carrying capacity of a preset line, and the sum of real-time load currents of the two switches positioned at the two ends of the fault section at the moment before the fault occurs is not greater than the maximum current-carrying capacity of the preset line, the interconnection switch enters the action judgment of the self-rotating function based on the self-rotating function action condition, otherwise, the interconnection switch exits the action judgment of the self-rotating function;
and if the autorotation function action condition is met, generating a corresponding autorotation function action instruction for executing the autorotation function.
Further, the action condition specifically includes:
the interconnection switch is in the position of separating brake, and the interconnection switch is located the adjacent section that changes the supply line one side and has voltage, and the interconnection switch is located the adjacent section that waits to change supply line one side and does not have voltage, and two switches at trouble section both ends all are in the position of separating brake and the unable combined floodgate of shutting down switch-on function.
Further, the interconnection switch still includes before the action judgement that gets into from the rotation function based on from the rotation function action condition:
the interconnection switch judges whether to carry out switching on or off of the spinning function according to the switching-on and switching-off conditions of the spinning function, if the switching-on and switching-off conditions of the spinning function are met, the spinning function is automatically switched on, and if the switching-off conditions of the switching-on and switching-off conditions of the spinning function are met, the spinning function is automatically switched off.
Further, the input conditions specifically include:
the interconnection switch is in the separating brake position, and the adjacent section of interconnection switch position in the circuit side that supplies has voltage, and the adjacent section of interconnection switch position in waiting to supply circuit one side has voltage.
Further, the exit conditions are specifically:
the interconnection switch is in the on position.
Further, the preset maximum current-carrying capacity of the line is obtained by multiplying the overload coefficient and the maximum current-carrying capacity of the line.
This application second aspect provides a device that moves back of throwing of 10kV distribution network line rotation electric function, includes:
the 10kV self-rotation functional module is used for executing a switching strategy according to the relevant information of the line, generating a switching judgment result of the self-rotation function and sending a corresponding self-rotation function switching instruction according to the switching judgment result;
the distribution network dispatching master station data processing and analyzing control subsystem is used for acquiring line information, generating line related information after analyzing and processing the line information and sending the line related information to the 10kV self-generating functional module, and the distribution network dispatching master station data processing and analyzing control subsystem is connected with the 10kV self-generating functional module through a first data interface;
the line information comprises the voltage, the current and the switch position of the line, and the line related information comprises the real-time current value of the switch in the station at the preset moment, the historical highest current value in the preset time period, the switch position of the switch outside the station, the real-time current value of the switch outside the station at the preset moment, the historical highest current value in the preset time period and the voltage value of each line section;
the plant station telecontrol system terminal is connected with the distribution network dispatching master station data processing and analyzing control subsystem through a first telecontrol channel;
the station measurement and control device is used for acquiring the switch position, the voltage value and the current value of the station equipment, executing the data processing of the distribution network dispatching master station and analyzing a control instruction sent by the control subsystem to the station equipment, and is connected with the station telecontrol system terminal through a second data interface;
the feeder automation terminal is connected with the distribution network dispatching master station data processing and analyzing control subsystem through a second telecontrol channel;
and the off-site switch measurement and control device is used for acquiring the switch position, the voltage value and the current value of the off-site switch, executing a control instruction sent to the off-site switch measurement and control device by the distribution network dispatching main station data processing and analysis control subsystem, and is connected with the feeder automation terminal through a third data interface.
Further, the 10kV rotation power function module specifically includes:
the 10kV self-rotation power data analysis module is used for acquiring line related information sent by the distribution network dispatching master station data processing and analysis control subsystem, executing a switching strategy according to the line related information and generating a switching judgment result of a self-rotation power function, and the 10kV self-rotation power data analysis module is connected with the distribution network dispatching master station data processing and analysis control subsystem through a first data interface;
and the 10kV self-rotation power strategy execution module is used for sending out a corresponding self-rotation power function switching-on/off instruction according to the switching-on/off judgment result, and the 10kV self-rotation power strategy execution module is connected with the 10kV self-rotation power data analysis module through a fourth data interface.
The third aspect of the application provides a device that moves on and off of 10kV distribution network line rotation electric function, and the device includes treater and memory:
the memory is used for storing the computer program and sending the instructions of the computer program to the processor;
the processor executes the switching method of the self-rotating function of the 10kV power distribution network line according to the instructions of the computer program.
A fourth aspect of the present application provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements a method for switching on and off a 10kV distribution network line from a rotating power function as in the first aspect.
In summary, the application provides a method and a device for switching on and off a self-rotation function of a 10kV power distribution network line, by acquiring switch positions, voltage values and current values on the line, historical highest current values of switches at two ends of a fault section within a certain period and switch real-time load currents immediately before a fault occurs are further acquired, and switching on and off of the self-rotation function is determined according to action conditions of the self-rotation function by taking the historical highest load currents and the real-time load currents as criteria, so that the self-rotation function is intelligently switched on or switched off according to specific line load conditions, and the problem of data distortion caused by only adopting the historical highest load currents as the criteria is avoided. Furthermore, the current values of the switches at two ends of the fault section on the line are obtained and used for judging whether the line is overloaded, so that the real-time current values of the transfer part of the line can be only considered for analysis to judge whether the transfer condition is met, and the judgment on whether the line is overloaded is more accurate.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic flow chart of a method for switching on and off a self-rotating power function of a 10kV power distribution network provided by an embodiment of the invention;
fig. 2 is a line connection diagram of two 10kV power distribution network lines in normal operation according to an embodiment of the present invention;
fig. 3 is a line connection diagram when a line of one of two 10kV power distribution network lines fails according to an embodiment of the present invention;
fig. 4 is a logic diagram for judging an input condition in a method for switching on and off a self-rotating function of a 10kV power distribution network provided by an embodiment of the invention;
fig. 5 is a logic diagram for judging an exit condition in the method for switching on and off the self-rotating power function of the 10kV power distribution network provided by the embodiment of the invention;
fig. 6 is a logic diagram of judging whether the self-rotating power function is switched on or off when a line of two 10kV power distribution network lines fails according to an embodiment of the present invention;
fig. 7 is a logic diagram of judging whether a self-power-generating function is switched on or off when another section of two 10kV power distribution network lines fails according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a switching device with a self-rotating function for a 10kV power distribution network line provided in an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the embodiments described below are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 2 and 3, fig. 2 shows a connection mode of two 10kV lines in normal operation. A plurality of switches are arranged on two lines of a 10kV bus power supply A line of a transformer substation A and a 10kV bus power supply B line of a transformer substation B, the S4 switch is called as an interconnection switch of the A line and the B line, the A line has a feeder automation function, and the self-rotation function of the S4 switch is put into use. S1 and S7 are switches located in the substation, referred to as in-station switches for short; s2, S3, S4, S5, and S6 are switches located outside the substation, and are simply referred to as off-station switches. Assuming that when a certain section of the line L2 of the A line has a fault, after the feeder line automatically isolates the fault, the power supply of the line L1 is restored by the S1 switch, the power supply of the line L3 needs to be restored by automatically closing the S4 switch, and the situation after the power supply is restored is shown in FIG. 3.
The operating conditions of the auto-spinning function of the interconnection switch S4 are: (1) the L4 line has voltage; (2) the L3 line has no voltage; (3) the S4 switch is in the opening position; (4) the fault has been isolated.
The input conditions of the auto-rotation function of the interconnection switch S4 are as follows: under the condition of two-line ring network, the sum of (annual) maximum load currents of the two lines does not exceed the rated current-carrying capacity of any one line. Three or more line ring networks are similar, and the line cannot be overloaded after the switching is required. The long-time overload of the power line can cause the line to generate heat, and the line can be damaged in serious conditions.
Referring to fig. 1, the present embodiment provides a method for switching on and off a 10kV distribution network line from a rotating power function, including the following steps:
s101: and acquiring related information of the line, wherein the related information of the line comprises a real-time current value of the switch in the station at a preset moment, a historical highest current value in a preset time period, a switch position of each switch outside the station, a real-time current value of each switch outside the station at the preset moment, a historical highest current value in the preset time period and a voltage value of each line.
The switch positions refer to the on position and the off position of the switch.
S102: and respectively obtaining the historical highest load current of two switches positioned at two ends of a fault section on the line in a preset time period and the real-time load current at the moment before the fault occurs according to the related information of the line.
It should be noted that, in order to adapt to the situation that only part of the lines are transshipped, the relevant current values of the two switches located at the two ends of the fault section are obtained, so that the current value of the transshipped line can be obtained without considering the situations of other non-transshipped lines, that is, only whether part of the transshipped line is overloaded or not is considered, and whether all the lines are overloaded or not is not considered, which better meets the practical situation. In addition, the two switches at two ends of the fault section can be an in-station switch or an out-station switch.
S103: if the sum of historical highest load currents of the two switches positioned at the two ends of the fault section in a preset time period is not greater than the maximum current-carrying capacity of a preset line, and the sum of real-time load currents of the two switches positioned at the two ends of the fault section at the moment before the fault occurs is not greater than the maximum current-carrying capacity of the preset line, the interconnection switch enters the action judgment of the self-power-rotating function based on the self-power-rotating function action condition; otherwise, the contact switch is judged to exit the action of the self-rotating function.
It should be noted that, when the sum of historical highest load currents of the two switches in the preset time period is not greater than the preset maximum line carrying capacity, and the sum of real-time load currents of the two switches at the moment before the fault occurs is not greater than the preset maximum line carrying capacity, it may be considered that the line after the transfer is not overloaded, and therefore, the judgment of the action condition of the self-power-generation function may be performed. The preset maximum line carrying capacity is obtained by multiplying an overload coefficient and the maximum line carrying capacity, and the overload coefficient can be adjusted according to actual conditions.
Before the judgment of the action condition of the self-rotation function, the interconnection switch needs to carry out intelligent switching on and off of the self-rotation function in advance according to the relevant information of the circuit, and the method specifically comprises the following steps:
the interconnection switch judges whether to carry out switching on or off of the spinning function according to the switching-on and switching-off conditions of the spinning function, if the switching-on and switching-off conditions of the spinning function are met, the spinning function is automatically switched on, and if the switching-off conditions of the switching-on and switching-off conditions of the spinning function are met, the spinning function is automatically switched off.
Referring to fig. 4, the input conditions specifically include: the interconnection switch is in the separating brake position, and the adjacent section of interconnection switch position in the circuit side that supplies has voltage, and the adjacent section of interconnection switch position in waiting to supply circuit one side has voltage. If the condition is met, the self-rotating function of the interconnection switch is automatically switched on. That is, in fig. 4, if the interconnection switch is opened, a = 1; if the adjacent section of the interconnection switch on one side of the power supply line has voltage, B = 1; if the adjacent section of the interconnection switch on one side of the line to be switched has voltage, C = 1; y = a · B · C; when Y =1, the spinning function is put into operation.
Referring to fig. 5, the exit condition is specifically: the interconnection switch is in the on position. That is, in fig. 5, when the interconnection switch is turned on, D = 1; y =
(ii) a And when Y =0, the spinning function is withdrawn.
S104: and if the autorotation function action condition is met, generating a corresponding autorotation function action instruction for executing the autorotation function.
The operation conditions specifically include:
the interconnection switch is in the position of separating brake, and the interconnection switch is located the adjacent section of commentaries on classics supply circuit one side and has voltage, and the interconnection switch is located the adjacent section of waiting to commentaries on classics supply circuit one side and does not have voltage, and two switches at trouble section both ends all are in the position of separating brake and have blocked the unable combined floodgate of combined floodgate function.
The method of the present embodiment will be further described below by taking a line connection diagram of two 10kV power distribution network lines shown in fig. 2 during normal operation as an example.
Referring to fig. 6, if a fault occurs in the line L2, the feeder automation function will isolate the fault, S2 and S3 are two switches for isolating the fault (at this time, the switch is in the open position, and the locked and closed function cannot be closed, and the auto-rotation function is automatically turned on), the real-time load current of the S3 switch at the time before the fault occurs is set to I3, the historical maximum load current of the S3 switch at the last month is set to I3, the real-time load current of the S7 switch at the time before the fault occurs is set to I7, the historical maximum load current of the S7 switch at the last month is set to I7, and the maximum current-carrying capacity of the line is Imax. The method comprises the following steps that a condition 1 calculates whether a current real-time load meets a transfer requirement, namely the sum of I7+ I3 does not exceed k times of Imax, a condition 2 calculates whether a historical load meets the transfer requirement, namely the sum of I7+ I3 does not exceed k times of Imax, the spinning function is kept put in only when the conditions 1 and 2 are met simultaneously, action conditions are judged, otherwise, the operation is immediately quitted, the action conditions are not judged, and the judgment logic is shown in figure 6, namely when I7+ I3 is not more than k times of Imax, E = 1; when I7+ I3 is not more than k.Imax, F = 1; y = E · F; when Y =1, the spinning function is kept on, and when Y =0, the spinning function is exited.
Similarly, referring to fig. 7, if a fault occurs in L1, the feeder automation function will isolate the fault, S1 and S2 are two switches for isolating the fault (at this time, the switch is in the open position, and the closed function is already closed, and the auto-power function is automatically turned on), the real-time load current of the S2 switch at the time before the fault occurs is I2, the historical highest load current of the S2 switch at the last month is I2, the real-time load current of the S7 switch at the time before the fault occurs is I7, the historical highest load current of the S7 switch at the last month is I7, and the maximum current-carrying capacity of the line is Imax. The method comprises the following steps that a condition 1 calculates whether a current real-time load meets a transfer requirement, namely the sum of I7+ I2 does not exceed k times of Imax, a condition 2 calculates whether a historical load meets the transfer requirement, namely the sum of I7+ I2 does not exceed k times of Imax, the spinning function is kept put in only when the conditions 1 and 2 are met simultaneously, action conditions are judged, otherwise, the operation is immediately quitted, the action conditions are not judged, and the judgment logic is shown in fig. 7, namely when I7+ I2 is not more than k times of Imax, G = 1; when I7+ I2 is not more than k.Imax, H = 1; y = G · H; when Y =1, the spinning function is kept on, and when Y =0, the spinning function is exited.
In the above example, if only the situation that the whole line a (i.e. L1+ L2+ L3) is transferred to the line B for supplying power is considered, the final criterion only needs to collect the real-time current values of the intra-station switch S1 of the line a and the intra-station switch S7 of the line B for analysis. However, in order to adapt to the situation that only part of the lines are switched, the real-time current value of the off-station switch S2 or S3 on the a line and the real-time current of the in-station switch S7 on the B line can be collected for analysis, so that whether the condition that the part of the lines (i.e., L3 or L2+ L3) of the a line is switched to the B line power supply can be analyzed.
According to the switching method for the self-rotation function of the 10kV power distribution network line, the switch position, the voltage value and the current value on the line are obtained, the historical highest current value of the switches at two ends of a fault section in a certain period and the switch real-time load current immediately before the fault occurs are further obtained, the switching of the self-rotation function is determined according to the action conditions of the self-rotation function by taking the historical highest load current and the real-time load current as criteria, the self-rotation function is intelligently switched on or switched off according to the specific line load condition, and the problem of data distortion caused by only adopting the historical highest load current as the criterion is solved. Furthermore, the current values of the switches at two ends of the fault section on the line are obtained and used for judging whether the line is overloaded, so that the real-time current values of the transfer part of the line can be only considered for analysis to judge whether the transfer condition is met, and the judgment on whether the line is overloaded is more accurate.
The above is a detailed description of an embodiment of the method for switching on and off the self-rotating power function of the 10kV power distribution network line provided by the invention, and the following is a detailed description of an embodiment of the device for switching on and off the self-rotating power function of the 10kV power distribution network line provided by the invention.
Referring to fig. 8, the present embodiment provides a device for switching on and off a 10kV distribution network line with a self-rotating function, including:
the 10kV self-rotation functional module is used for executing a switching strategy according to the relevant information of the line, generating a switching judgment result of the self-rotation function and sending a corresponding self-rotation function switching instruction according to the switching judgment result;
the distribution network scheduling main station data processing and analyzing control subsystem is used for acquiring line information, generating line related information after analyzing and processing the line information, and sending the line related information to the 10kV self-power-generation functional module, and the distribution network scheduling main station data processing and analyzing control subsystem is connected with the 10kV self-power-generation functional module through a first data interface;
the line information comprises the voltage, the current and the switch position of the line, and the line related information comprises the real-time current value of the switch in the station at the preset moment, the historical highest current value in the preset time period, the switch position of the switch outside the station, the real-time current value of the switch outside the station at the preset moment, the historical highest current value in the preset time period and the voltage value of each line section;
the plant station telecontrol system terminal is connected with the distribution network dispatching master station data processing and analyzing control subsystem through a first telecontrol channel;
the station measurement and control device is used for acquiring the switch position, the voltage value and the current value of the station equipment, executing the data processing of the distribution network dispatching master station and analyzing a control instruction sent by the control subsystem to the station equipment, and is connected with the station telecontrol system terminal through a second data interface;
the feeder automation terminal is connected with the distribution network dispatching master station data processing and analyzing control subsystem through a second telecontrol channel;
and the off-site switch measurement and control device is used for acquiring the switch position, the voltage value and the current value of the off-site switch, executing a control instruction sent to the off-site switch measurement and control device by the distribution network dispatching main station data processing and analysis control subsystem, and is connected with the feeder automation terminal through a third data interface.
Further, the 10kV rotation power function module specifically includes:
the 10kV self-rotation power data analysis module is used for acquiring line related information sent by the distribution network dispatching master station data processing and analysis control subsystem, executing a switching strategy according to the line related information and generating a switching judgment result of a self-rotation power function, and the 10kV self-rotation power data analysis module is connected with the distribution network dispatching master station data processing and analysis control subsystem through a first data interface;
and the 10kV self-rotation power strategy execution module is used for sending out a corresponding self-rotation power function switching-on/off instruction according to the switching-on/off judgment result, and the 10kV self-rotation power strategy execution module is connected with the 10kV self-rotation power data analysis module through a fourth data interface.
Data can be transmitted among the 10kV self-power-generation strategy execution module, the 10kV self-power-generation data analysis module, the distribution network dispatching main station data processing and analysis control subsystem, the plant station telemechanical system terminal, the plant station measurement and control device, the feeder automation terminal and the off-station switch measurement and control device.
The station measurement and control device continuously collects load current values (I7 and I7 in the embodiment) of switches in a 10kV line station of the station, transmits the load current values to a station telecontrol system terminal, and transmits the load current values to a distribution network scheduling master station through a telecontrol channel.
The off-site switch measurement and control device continuously collects load current values (such as I3, I3, I2 and I2 in the previous embodiment), positions (closing or opening) of off-site switches and line voltage values (used for judging whether the lines have voltage) of each off-site switch of the 10kV line, transmits the load current values to the feeder automation terminal, and transmits the load current values to the distribution network scheduling master station through the telecontrol channel.
The data processing and analyzing control subsystem of the distribution network dispatching master station collects load current values (I7, I7) of switches in 10kV lines of all stations of the whole power grid, load current values (I3, I3, I2 and I2) of switches outside the stations of the 10kV lines, positions (closing or opening) of switches outside the stations and line voltage values, and transmits the data such as the load current values (I7, I7, I3, I3, I2 and I2) of the switches inside the stations and the switches outside the stations, the positions of the switches outside the stations, the line voltage values and the like to the 10kV autorotation data analyzing module after primary processing.
The 10kV self-rotation power data analysis module comprehensively analyzes and judges data such as load current values of the in-station switch and the out-station switch, positions of the out-station switch, line voltage values and the like according to judgment and adjustment logic provided by the switching method of the 10kV power distribution network line self-rotation power function in the foregoing embodiment, and then transmits a judgment result to the 10kV self-rotation power strategy execution module.
And the 10kV self-rotation power strategy execution module executes corresponding 10kV self-rotation power function input or exit according to the judgment result of the 10kV self-rotation power data analysis module.
In summary, the switching and reversing device for the 10kV power distribution network line self-rotation function provided by this embodiment can automatically switch in or reverse the 10kV self-rotation function according to the comprehensive analysis result of the data such as the load condition, the switch position, and the line voltage of the in-station switch and the out-station switch of the 10kV line, so as to reduce the workload of the distribution network operation and maintenance personnel, reduce the risk of misoperation, improve the work efficiency of the distribution network dispatcher, and well consider the problems of the power supply reliability of the 10kV line and the line operation safety.
The above is a detailed description of an embodiment of the device for switching on and off the self-rotating power function of the 10kV power distribution network line provided by the invention, and the following is a detailed description of an embodiment of the device for switching on and off the self-rotating power function of the 10kV power distribution network line provided by the invention.
A switching device for a self-rotating power function of a 10kV power distribution network line, comprising a processor and a memory:
the memory is used for storing a computer program and sending instructions of the computer program to the processor;
the processor executes the switching method of the self-rotation function of the 10kV power distribution network line according to the instructions of the computer program.
The above is a detailed description of an embodiment of the switching device for the self-rotating power function of the 10kV power distribution network line provided by the present invention, and the following is a detailed description of an embodiment of a computer readable storage medium provided by the present invention.
A computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, implements a method for switching on and off a 10kV distribution network line for spinning power, as described in the foregoing embodiments.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A switching method for the self-rotating power function of a 10kV power distribution network line is characterized by comprising the following steps:
acquiring relevant information of a line, wherein the relevant information of the line comprises a real-time current value of an in-station switch at a preset moment, a historical highest current value in a preset time period, a switch position of each off-station switch, a real-time current value of each off-station switch at the preset moment, a historical highest current value in the preset time period and a voltage value of each line;
according to the related information of the line, historical highest load current of two switches positioned at two ends of a fault section in the line in a preset time period and real-time load current at the moment before the fault occurs are respectively obtained;
if the sum of historical highest load currents of the two switches positioned at the two ends of the fault section in a preset time period is not greater than the maximum current-carrying capacity of a preset line, and the sum of real-time load currents of the two switches positioned at the two ends of the fault section at the moment before the fault occurs is not greater than the maximum current-carrying capacity of the preset line, the interconnection switch enters the action judgment of the self-rotation function based on the self-rotation function action condition, otherwise, the interconnection switch exits the action judgment of the self-rotation function;
and if the autorotation function action condition is met, generating a corresponding autorotation function action instruction for executing the autorotation function.
2. The switching method for the self-rotating function of the 10kV power distribution network line according to claim 1, wherein the self-rotating function action conditions specifically include:
the interconnection switch is located at a switch-off position, a voltage exists in an adjacent section of the interconnection switch located on one side of the transfer supply line, no voltage exists in an adjacent section of the interconnection switch located on one side of the to-be-transferred supply line, and the two switches at two ends of the fault section are both located at the switch-off position and cannot be switched on under the locking and switching-on functions.
3. The switching method for the self-rotation function of the 10kV power distribution network line according to claim 2, wherein before the judging of the action of the contact switch entering the self-rotation function based on the action condition of the self-rotation function, the method further comprises the following steps:
the interconnection switch judges whether to carry out switching on or off of the spinning function according to the switching-on and switching-off conditions of the spinning function, if the switching-on and switching-off conditions of the spinning function are met, the spinning function is automatically switched on, and if the switching-off conditions of the spinning function are met, the spinning function is automatically switched off.
4. The switching method for the self-generating function of the 10kV power distribution network line according to claim 3, wherein the switching conditions specifically comprise:
the interconnection switch is in a brake separating position, the adjacent section of the interconnection switch, which is positioned on one side of the transfer supply line, has voltage, and the adjacent section of the interconnection switch, which is positioned on one side of the to-be-transferred supply line, has voltage.
5. The switching method for the self-generating function of the 10kV power distribution network line according to claim 3, wherein the switching conditions are specifically as follows:
the tie switch is in the closed position.
6. The method for switching on and off the line self-rotating power function of the 10kV power distribution network according to claim 1, wherein the preset maximum line current-carrying capacity is obtained by multiplying an overload coefficient and the maximum line current-carrying capacity.
7. The utility model provides a device that moves back of throwing of 10kV distribution network line rotation electric function which characterized in that includes:
the 10kV self-rotation power function module is used for executing a switching strategy according to the relevant information of the line, generating a switching judgment result of the self-rotation power function and sending a corresponding self-rotation power function switching instruction according to the switching judgment result;
the distribution network scheduling main station data processing and analyzing control subsystem is used for acquiring line information, generating line related information after analyzing and processing the line information and sending the line related information to the 10kV self-power-generation functional module, and is connected with the 10kV self-power-generation functional module through a first data interface;
the line information comprises the voltage, the current and the switch position of a line, and the line related information comprises the real-time current value of an in-station switch at a preset moment, the historical highest current value in a preset time period, the switch position of each off-station switch, the real-time current value of each off-station switch at the preset moment, the historical highest current value in the preset time period and the voltage value of each line;
the plant station telecontrol system terminal is connected with the distribution network dispatching master station data processing and analyzing control subsystem through a first telecontrol channel;
the plant station measurement and control device is used for acquiring the switch position, the voltage value and the current value of plant station equipment, executing a control instruction sent to the plant station equipment by the distribution network dispatching master station data processing and analysis control subsystem, and is connected with the plant station telemechanical system terminal through a second data interface;
the feeder automation terminal is connected with the distribution network dispatching master station data processing and analyzing control subsystem through a second telecontrol channel;
and the off-site switch measurement and control device is used for acquiring the switch position, the voltage value and the current value of the off-site switch and executing the control command sent by the off-site switch measurement and control device which is right by the distribution network dispatching main station data processing and analysis control subsystem, and is connected with the feeder automation terminal through a third data interface.
8. The device of claim 7, wherein the 10kV power distribution network line self-rotation function module specifically comprises:
the 10kV self-rotation power data analysis module is used for acquiring line related information sent by the distribution network dispatching master station data processing and analysis control subsystem, executing a switching strategy according to the line related information and generating a switching judgment result of a self-rotation power function, and the 10kV self-rotation power data analysis module is connected with the distribution network dispatching master station data processing and analysis control subsystem through a first data interface;
and the 10kV self-power-generation strategy execution module is used for sending a corresponding self-power-generation function switching instruction according to the switching judgment result, and the 10kV self-power-generation strategy execution module is connected with the 10kV self-power-generation data analysis module through a fourth data interface.
9. The utility model provides a device that moves on and off of 10kV distribution network line rotation electric function which characterized in that, the equipment includes treater and memory:
the memory is used for storing a computer program and sending instructions of the computer program to the processor;
the processor executes the switching method of the self-generating function of the 10kV power distribution network line according to any one of claims 1 to 6 according to the instructions of the computer program.
10. A computer-readable storage medium, wherein the computer-readable storage medium stores thereon a computer program, and when the computer program is executed by a processor, the computer program implements a method for switching on and off the spinning function of a 10kV distribution network according to any one of claims 1 to 6.
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