CN114221342B - Loop closing current calculation method and device, storage medium and electronic equipment - Google Patents
Loop closing current calculation method and device, storage medium and electronic equipment 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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/08—Synchronising of networks
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- G06F2113/04—Power grid distribution networks
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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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
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Abstract
The invention discloses a loop closing current calculation method, a loop closing current calculation device, a storage medium and electronic equipment. Wherein the method comprises the following steps: vector voltage information uploaded by at least two voltage acquisition terminals is received, wherein the vector voltage information is used for representing vector voltages at two ends of a loop closing point of a bus tie switch; vector voltage information is processed by adopting a power grid simulation program, and equivalent reactance information of the loop closing point is obtained; calculating equivalent impedance information of the loop closing point in a plurality of different operation modes based on the equivalent reactance information, wherein the operation modes comprise at least one of the following: a high load operation mode, a flat load operation mode, and a low load operation mode; and calculating the loop closing current of the loop closing point based on each operation mode of the loop closing point and equivalent impedance information corresponding to each operation mode. The invention solves the technical problems of poor real-time performance and high maintenance cost of an online calculation method in the off-line calculation method of the loop closing current in the prior art.
Description
Technical Field
The present invention relates to the field of data processing technologies, and in particular, to a method and apparatus for calculating a closed loop current, a storage medium, and an electronic device.
Background
When the power grid is overhauled and the power grid mode is changed before important guarantee, the power grid can perform the operation of crossing the integrated bus among the partitions. The current after closing the loop can not be known by a dispatcher, the operation can only be tried by virtue of operation experience when the load of the power grid is small at night, and the reason for overlarge closing the loop is not only influenced by the load of the local power grid at the receiving end, but also relates to the current grid and power supply factors of the power grid, so that the possible closing current after closing the loop is often inaccurate only by the dispatcher depending on the local load, and the overlarge closing current can cause the protection action of a bus or a circuit breaker at the upper level of the load, impact on the power grid and even short-time power failure to a user.
The existing common method is mainly based on an offline simulation method and an online calculation analysis method, the offline data analysis method is mainly used for calculating through main stream simulation software by collecting offline power grid data, but the offline simulation calculation method is limited to the selected offline power grid data, and the method has no real-time performance and cannot guide actual production operation. Although the online calculation method has good real-time performance, under the limit of the prior communication technology, the online calculation method carries out large-scale, real-time and accurate data acquisition on the power grid through the equal measurement device in a large scale, and the required cost is extremely high and the maintenance cost is extremely high. In addition, in practical application, the simulation result may be distorted only due to the disconnection or acquisition errors of a few points, even the power flow of the power grid is not converged, the calculation result cannot be obtained, and the effective guidance of a dispatcher is lost.
In view of the above problems, no effective solution has been proposed at present.
Disclosure of Invention
The embodiment of the invention provides a loop closing current calculating method, a loop closing current calculating device, a storage medium and electronic equipment, which at least solve the technical problems of poor real-time performance and high maintenance cost of an online calculating method in the prior art.
According to an aspect of the embodiment of the present invention, there is provided a loop closing current calculation method, including: the method comprises the steps of receiving vector voltage information uploaded by at least two voltage acquisition terminals, wherein the vector voltage information is used for representing vector voltages at two ends of a loop closing point of a bus tie switch; processing the vector voltage information by adopting a power grid simulation program to obtain equivalent reactance information of the loop closing point; calculating equivalent impedance information of the loop closing point in a plurality of different operation modes based on the equivalent reactance information, wherein the operation modes comprise at least one of the following: a high load operation mode, a flat load operation mode, and a low load operation mode; and calculating the loop closing current of the loop closing point based on each operation mode of the loop closing point and equivalent impedance information corresponding to each operation mode.
Optionally, before the receiving the vector voltage information uploaded by the at least two voltage acquisition terminals, the method further includes: selecting the loop closing point of the bus tie switch according to the operation requirement of the power grid; and based on the position information of the loop closing point, respectively installing at least one voltage acquisition terminal at two ends of the loop closing point.
Optionally, before the vector voltage information is processed by using the power grid simulation program to obtain the equivalent reactance information of the loop closing point, the method further includes: determining a transformer substation to which the ring closing point belongs and a management area of the transformer substation based on the position information of the ring closing point; determining a simulation range of the power grid simulation program based on the management area of the transformer substation, wherein the simulation range at least comprises: the power grid and the related remote power supply of the management area of the transformer substation.
Optionally, the calculating the equivalent impedance information of the loop closing point in a plurality of different operation modes based on the equivalent reactance information includes: calculating equivalent resistances of the loop closing point in a plurality of different operation modes; obtaining an equivalent impedance trend graph based on the equivalent resistance and the equivalent reactance information; determining load section information in a plurality of operation modes, wherein the load section is a moment section at any moment in the current operation mode, and the load section information is used for reflecting the electric energy transmission capacity in the current operation mode; and determining the equivalent impedance information under the different operation modes based on the equivalent impedance trend graph and the load section information.
Optionally, the calculating the loop closing current of the loop closing point based on each operation mode of the loop closing point and the equivalent impedance information corresponding to the operation mode includes: calculating a voltage difference of the vector voltage based on the vector voltages at both ends of the loop closing point in the current operation mode; and calculating the loop closing current of the loop closing point by using the voltage difference and the equivalent impedance information.
According to another aspect of the embodiment of the present invention, there is also provided a loop closing current calculating apparatus, including: the receiving module is used for receiving vector voltage information uploaded by the at least two voltage acquisition terminals, wherein the vector voltage information is used for representing vector voltages at two ends of a loop closing point of the bus tie switch; the processing module is used for processing the vector voltage information by adopting a power grid simulation program to obtain equivalent reactance information of the loop closing point; the first calculation module is configured to calculate equivalent impedance information of the loop closing point in a plurality of different operation modes based on the equivalent reactance information, where the operation modes include at least one of: a high load operation mode, a flat load operation mode, and a low load operation mode; and the second calculation module is used for calculating the loop closing current of the loop closing point based on each operation mode of the loop closing point and equivalent impedance information corresponding to each operation mode.
Optionally, the first computing module includes: the first calculation unit is used for calculating equivalent resistances of the loop closing point in a plurality of different operation modes; the processing unit is used for obtaining an equivalent impedance trend chart based on the equivalent resistance and the equivalent reactance information; a first determining unit configured to determine load section information in a plurality of operation modes, where the load section is a time section at any time in the current operation mode, and the load section information is configured to reflect power transmission capability in the current operation mode; and the second determining unit is used for determining the equivalent impedance information in the different operation modes based on the equivalent impedance trend graph and the load section information.
Optionally, the second computing module includes: a second calculation unit for calculating a voltage difference of the vector voltages based on the vector voltages at both ends of the loop closing point in the current operation mode; and the third calculation unit is used for calculating the loop closing current of the loop closing point by using the voltage difference and the equivalent impedance information.
According to another aspect of the embodiment of the present invention, there is further provided a computer readable storage medium, where the computer readable storage medium includes a stored program, and when the program runs, the device in which the computer readable storage medium is located is controlled to execute any one of the above loop closing current calculation methods.
According to another aspect of the embodiment of the present invention, there is also provided an electronic device including a memory and a processor, where the memory stores a computer program, and the processor is configured to run the computer program to perform any one of the above-described loop closing current calculating methods.
In the embodiment of the invention, the vector voltage information uploaded by at least two voltage acquisition terminals is received, wherein the vector voltage information is used for representing the vector voltages at two ends of a loop closing point of a bus tie switch; processing the vector voltage information by adopting a power grid simulation program to obtain equivalent reactance information of the loop closing point; calculating equivalent impedance information of the loop closing point in a plurality of different operation modes based on the equivalent reactance information, wherein the operation modes comprise at least one of the following: a high load operation mode, a flat load operation mode, and a low load operation mode; based on each operation mode of the loop closing point and the equivalent impedance information corresponding to each operation mode, the loop closing current of the loop closing point is calculated, the purpose of collecting vector voltage of the loop closing point at low cost is achieved, the technical effect of calculating the loop closing current of the loop closing point in real time and accurately is achieved, and the technical problems that in the prior art, the real-time performance is poor and the maintenance cost of an online calculation method is high are solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
FIG. 1 is a flow chart of a loop closing current calculation method according to an embodiment of the invention;
FIG. 2 is a schematic diagram of an alternative grid simulation program reactance calculation flow according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an alternative grid simulation program impedance calculation flow in accordance with an embodiment of the present invention;
FIG. 4 is a schematic diagram of current waveforms when an alternative closed loop current is a steady state closed loop current according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an alternative closed loop instantaneous current waveform according to an embodiment of the invention;
Fig. 6 is a schematic structural diagram of a closed loop current calculating device according to an embodiment of the invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
According to an embodiment of the present invention, there is provided an embodiment of a loop closing current calculation method, it should be noted that the steps shown in the flowchart of the drawings may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is shown in the flowchart, in some cases the steps shown or described may be performed in an order different from that herein.
Fig. 1 is a flowchart of a loop closing current calculation method according to an embodiment of the present invention, as shown in fig. 1, the method includes the following steps:
Step S102, receiving vector voltage information uploaded by at least two voltage acquisition terminals, wherein the vector voltage information is used for representing vector voltages at two ends of a loop closing point of a bus tie switch;
step S104, processing the vector voltage information by adopting a power grid simulation program to obtain equivalent reactance information of the loop closing point;
Step S106, calculating equivalent impedance information of the loop closing point in a plurality of different operation modes based on the equivalent reactance information, wherein the operation modes comprise at least one of the following: a high load operation mode, a flat load operation mode, and a low load operation mode;
Step S108, calculating the loop closing current of the loop closing point based on each operation mode of the loop closing point and the equivalent impedance information corresponding to each operation mode.
In the embodiment of the invention, a power grid simulation system is adopted to receive vector voltage information uploaded by voltage acquisition terminals at two ends of a loop closing point of a plurality of bus tie switches, a power grid simulation program is adopted to process the vector voltage information, and equivalent reactance information of the loop closing point is obtained through calculation; a plurality of more typical modes of operation are selected, for example: calculating equivalent impedance information of the loop closing point in a plurality of typical operation modes based on the equivalent reactance information; and finally, calculating the loop closing current of the loop closing point based on each operation mode of the loop closing point and equivalent impedance information corresponding to each operation mode.
It should be noted that, the vector voltage information is used for representing the vector voltages at two ends of the loop closing point of the busbar tie switch; the operation modes include: a high load operation mode, a flat load operation mode, a low load operation mode, and the like.
As an optional embodiment, the voltage acquisition terminal is used for acquiring the vector voltage information at a proper frequency, when the simulation program is used for processing the vector voltage information, a management power grid area of a transformer substation to which the acquired loop closing point belongs is required to be predetermined, the whole power grid area is simulated, and the loop closing current is obtained through calculation; and recording and storing the obtained information of reactance, impedance and the like of each operation mode at different moments in the calculation process, and calculating the loop closing current according to the stored impedance information and displaying in real time when the loop closing current is calculated later so as to facilitate the reference and operation of power grid dispatching personnel.
According to the embodiment of the invention, the online data real-time acquisition and the offline simulation result are reasonably combined, the problem that a power grid dispatcher cannot know the magnitude of current after loop closing and can only operate by experience when switching operation is carried out is solved, the method which is high in practicability and capable of being used in a large scale is provided for urban power grid high-reliability switching operation, the reliability of operation is remarkably improved, the cost is controllable, the calculation accuracy is high, and compared with a traditional PMU (power grid vector voltage acquisition device), the method adopts a latest 5G vector acquisition terminal, and the method for uploading a calculated effective value firstly and then used by the PMU is changed into a method for uploading voltage in full quantity and then carrying out background processing because output data is not limited, so that a background processor is free from the limitation of the processing capacity of a simulation system in a transformer substation, the data processing capacity is stronger, and selectable processing equipment is more various. Meanwhile, the voltage acquisition terminal does not need to process acquired data, is smaller and smaller, and is lower in installation limitation.
In an alternative embodiment, before the receiving the vector voltage information uploaded by the at least two voltage acquisition terminals, the method further includes:
Step S202, selecting the ring closing point of the bus tie switch according to the operation requirement of a power grid;
step S204, based on the position information of the loop closing point, at least one voltage acquisition terminal is respectively installed at two ends of the loop closing point.
In the embodiment of the invention, when the voltage acquisition terminal is installed, the operation requirement of a power grid is considered, and the loop closing point of the bus tie switch is selected according to the operation requirement of the power grid; after the loop closing point is determined, the voltage acquisition terminals are respectively arranged at the two ends of the loop closing point and used for acquiring vector voltage information at the two ends of the loop closing point.
As an alternative embodiment, in the installation process, the site is required to be surveyed in advance, necessary checking is performed on related design drawings, on-line installation is performed under the safety operation rules, according to the requirement of the production operation of the power grid, the sites with high requirements for closing the loop first and then switching the gate are collected together, then a bus tie switch is selected from the sites with high operation failure rate (namely, the success rate of closing the loop is not high) by virtue of the experience of dispatching operation personnel, 5G virtual acquisition terminals are installed at the inlet wire positions at the two ends of the bus tie switch, and the virtual acquisition terminals (namely, the voltage acquisition terminals) can acquire synchronous vector voltages.
It should be noted that, before the above vector voltage information is collected, the collection frequency f needs to be preset, where f=1/n, n is a sampling point collected for 1 second, and in order to meet the transient loop closing collection requirement, the sampling point recommends that the vector voltage is collected for 3200 times in one second. And the synchronous vector voltages collected at the two ends of the bus are added with time marks at corresponding moments to form the most core data characteristic sequence of the vector voltages: { U1 (t+m), U1 (t+m1), …, U1 (t+mn) } and { U2 (t+m), U2 (t+m2), …, U2 (t+mn) } wherein t is the start time of acquisition, m is the acquisition time scale, m is [0,1/n,2/n … ], and U1 and U2 are the synchronous vector voltages acquired at the two ends of the bus respectively.
In an alternative embodiment, before the vector voltage information is processed by using the power grid simulation program to obtain equivalent reactance information of the loop closing point, the method further includes:
Step S302, determining a transformer substation to which the ring closing point belongs and a management area of the transformer substation based on the position information of the ring closing point;
Step S304, determining a simulation range of the power grid simulation program based on the management area of the substation, where the simulation range at least includes: the power grid and the related remote power supply of the management area of the transformer substation.
In the embodiment of the invention, after the ring closing point position is determined, determining a transformer station to which the ring closing point belongs according to the position information of the ring closing point, and determining a management area of the transformer station; and determining the range of the power grid simulation program to be simulated based on the management area of the transformer substation.
Before the vector voltage information is subjected to simulation processing, parameters of a management area of the transformer substation are acquired, the collected parameters are subjected to parameter conversion processing, and the parameters are converted into per unit values required by a simulation system; after completing data conversion and determining simulation ranges, the power grid in the management area of the transformer substation is simulated and modeled, and the modeling scale is to cover all power grids of circuits and related remote power supplies related to the upper level of the selected transformer substation, and the power grid construction can be performed by using an electromechanical simulation program, for example: BPA program of China electric science institute program, PSASP program of electric power system analysis and synthesis, and the like; and after the construction is completed, calculating the vector voltage information by adopting a simulation system to obtain the equivalent reactance information of the loop closing point.
In an alternative embodiment, the calculating the equivalent impedance information of the loop closing point in a plurality of different operation modes based on the equivalent reactance information includes:
Step S402, calculating equivalent resistances of the loop closing point in a plurality of different operation modes;
Step S404, obtaining an equivalent impedance trend graph based on the equivalent resistance and the equivalent reactance information;
Step S406, determining load section information in a plurality of operation modes, wherein the load section is a moment section at any moment in the current operation mode, and the load section information is used for reflecting the electric energy transmission capacity in the current operation mode;
and step S408, determining equivalent impedance information in the different operation modes based on the equivalent impedance trend graph and the load section information.
In the embodiment of the invention, the equivalent resistance of the loop closing point in a plurality of different operation modes is calculated based on the equivalent reactance information, and an equivalent impedance trend chart is constructed; and determining load section information in a plurality of operation modes, and determining the equivalent impedance information in different operation modes based on the equivalent impedance trend graph and the load section information.
The load section is a time section at any time in the current operation mode, and the load section information is used to reflect the power transmission capability in the current operation mode.
As an alternative embodiment, as shown in the impedance calculation flow chart of the power grid simulation program shown in fig. 3, in the built power grid simulation program, a section of a certain moment of three power grid moments of a peak, a flat peak and a valley (high load, flat peak load and low load) of the power grid is selected, relevant information of power plant output, power grid load and the like related to the power grid is filled into the simulation program on the section, simulation tide debugging is performed, and it is ensured that the power tide in the built power grid is reasonable, the reactive power balance of the power system is ensured, and the power grid data is correct. Then calculating equivalent impedance Zeq under different operation modes by changing load carried by the loop closing points, partition load where the loop closing points are positioned, adjusting partition unit force, starting and stopping the unit and stopping the main network element according to the selected loop closing point transformer substation; the equivalent resistance under different modes is calculated to form an equivalent impedance trend graph, the main factors of the equivalent impedance are analyzed to form typical equivalent impedance of the power grid under the condition of the load, and loop closing point equivalent impedance Zeq, such as Zeq High load 、Zeq Flat peak load 、Zeq Low load , of the power grid under different load sections of the power grid is calculated sequentially through the method.
It should be noted that the analysis of the principal factors of the equivalent impedance includes: grid structure influencing factors: carding all relevant overhaul modes of the station, namely a line overhaul mode in a zone where the station is located and a transformer substation overhaul mode in the zone where the station is located; in-network power supply influencing factors: carding all starting modes of the power plant in the partition where the station is located; in-network load influencing factors: combing all load changes of the station and all load change conditions of the subareas; and all the factors are considered and calculated, the sensitivity of the influencing factors is analyzed according to the obtained calculated impedance result, the typical mode impedance calculated by the station is finally obtained, and three typical impedances Zeq are finally obtained by taking the high-load, flat-load and low-load operation modes as examples.
In an optional embodiment, the calculating the loop closing current of the loop closing point based on each operation mode of the loop closing point and the equivalent impedance information corresponding to the operation mode includes:
step S502, calculating the voltage difference of the vector voltage based on the vector voltages at two ends of the loop closing point in the current operation mode;
Step S504, calculating the loop closing current of the loop closing point by using the voltage difference and the equivalent impedance information.
In the embodiment of the invention, the voltage difference of the vector voltage is calculated based on the vector voltages at two ends of the loop closing point in the current operation mode; and calculating the loop closing current of the loop closing point by using the voltage difference and the equivalent impedance information.
As an alternative embodiment, U1 and U2 at the same moment of the loop closing point are subjected to vector subtraction to form DeltaU, and sequences { DeltaU (t+m), deltaU (t+m1), …, deltaU (t+mn) }, m is an acquisition time scale, m is [0,1/n,2/n … ], and n is a sampling point acquired for 1 second; selecting a power grid typical mode corresponding to the moment and Zeq obtained before the mode according to the selected moment; and (3) carrying out real-time loop closing current calculation: if n is 32K, i.e. every 1/3200 seconds, the loop closing current at this moment is calculated, and the current waveform diagram of the loop closing current is shown in fig. 4 when the loop closing current is steady-state loop closing current. Deriving by differential equation of loop closing current calculation, processing according to the most serious condition in calculation, obtaining loop closing instantaneous current diagram shown in figure 5, and obtaining the relation between transient current and steady state current because the angle of voltage phase angle at loop closing time is difficult to know; finally, the obtained DeltaU, loop closing steady-state current and loop closing transient current are displayed in real time so as to be convenient for power grid dispatching personnel to refer to and operate.
According to the embodiment of the invention, the online data real-time acquisition and the offline simulation result are reasonably combined, the problem that a power grid dispatcher cannot know the magnitude of the loop closing current and can only operate by experience when the switching operation is performed is solved, the method which is high in practicability and can be used in a large scale is provided for the urban power grid high-reliability switching operation, the operation reliability is remarkably improved, the cost is controllable, the calculation precision is high, the purpose of acquiring the vector voltage of the loop closing point at low cost is achieved, the technical effect of calculating the loop closing current of the loop closing point in real time and accurately is achieved, and the technical problem that the real-time performance is poor and the maintenance cost of the online calculation method is high in the prior art is solved.
Example 2
According to an embodiment of the present invention, an embodiment of a device for implementing the above-mentioned loop closing current calculation method is further provided, implemented or realized by an evaluation system of a cloud data platform, and fig. 6 is a schematic structural diagram of a loop closing current calculation device according to an embodiment of the present invention, and as shown in fig. 6, the above-mentioned device includes: a receiving module 60, a processing module 62, a first computing module 64, and a second computing module 66, wherein:
The receiving module 60 is configured to receive vector voltage information uploaded by at least two voltage acquisition terminals, where the vector voltage information is used to characterize vector voltages at two ends of a loop closing point of the bus tie switch;
the processing module 62 is configured to process the vector voltage information by using a power grid simulation program to obtain equivalent reactance information of the loop closing point;
A first calculation module 64, configured to calculate equivalent impedance information of the loop closing point in a plurality of different operation modes based on the equivalent reactance information, where the operation modes include at least one of: a high load operation mode, a flat load operation mode, and a low load operation mode;
the second calculating module 66 is configured to calculate a loop closing current of the loop closing point based on each operation mode of the loop closing point and equivalent impedance information corresponding to each operation mode.
Here, the receiving module 60, the processing module 62, the first calculating module 64 and the second calculating module 66 correspond to steps S102 to S108 in embodiment 1, and the four modules are the same as the examples and application scenarios implemented by the corresponding steps, but are not limited to those disclosed in embodiment 1.
Optionally, the first computing module includes: the first calculation unit is used for calculating equivalent resistances of the loop closing point in a plurality of different operation modes; the processing unit is used for obtaining an equivalent impedance trend chart based on the equivalent resistance and the equivalent reactance information; a first determining unit configured to determine load section information in a plurality of operation modes, where the load section is a time section at any time in the current operation mode, and the load section information is configured to reflect power transmission capability in the current operation mode; and the second determining unit is used for determining the equivalent impedance information in the different operation modes based on the equivalent impedance trend graph and the load section information.
Optionally, the second computing module includes: a second calculation unit for calculating a voltage difference of the vector voltages based on the vector voltages at both ends of the loop closing point in the current operation mode; and the third calculation unit is used for calculating the loop closing current of the loop closing point by using the voltage difference and the equivalent impedance information.
It should be noted that, the preferred implementation manner of this embodiment may be referred to the related description in embodiment 1, and will not be repeated here.
According to an embodiment of the present invention, there is also provided an embodiment of a computer-readable storage medium. Alternatively, in this embodiment, the above-described computer-readable storage medium may be used to store the program code executed by the loop closing current calculation method provided in embodiment 1 described above.
Alternatively, in this embodiment, the above-mentioned computer readable storage medium may be located in any one of the computer terminals in the computer terminal group in the computer network, or in any one of the mobile terminals in the mobile terminal group.
Optionally, in the present embodiment, the computer readable storage medium is configured to store program code for performing the steps of: the method comprises the steps of receiving vector voltage information uploaded by at least two voltage acquisition terminals, wherein the vector voltage information is used for representing vector voltages at two ends of a loop closing point of a bus tie switch; processing the vector voltage information by adopting a power grid simulation program to obtain equivalent reactance information of the loop closing point; calculating equivalent impedance information of the loop closing point in a plurality of different operation modes based on the equivalent reactance information, wherein the operation modes comprise at least one of the following: a high load operation mode, a flat load operation mode, and a low load operation mode; and calculating the loop closing current of the loop closing point based on each operation mode of the loop closing point and equivalent impedance information corresponding to each operation mode.
Optionally, the above computer readable storage medium is configured to store program code for performing the steps of: selecting the loop closing point of the bus tie switch according to the operation requirement of the power grid; and based on the position information of the loop closing point, respectively installing at least one voltage acquisition terminal at two ends of the loop closing point.
Optionally, the above computer readable storage medium is configured to store program code for performing the steps of: determining a transformer substation to which the ring closing point belongs and a management area of the transformer substation based on the position information of the ring closing point; determining a simulation range of the power grid simulation program based on the management area of the transformer substation, wherein the simulation range at least comprises: the power grid and the related remote power supply of the management area of the transformer substation.
Optionally, the above computer readable storage medium is configured to store program code for performing the steps of: calculating equivalent resistances of the loop closing point in a plurality of different operation modes; obtaining an equivalent impedance trend graph based on the equivalent resistance and the equivalent reactance information; determining load section information in a plurality of operation modes, wherein the load section is a moment section at any moment in the current operation mode, and the load section information is used for reflecting the electric energy transmission capacity in the current operation mode; and determining the equivalent impedance information under the different operation modes based on the equivalent impedance trend graph and the load section information.
Optionally, the above computer readable storage medium is configured to store program code for performing the steps of: calculating a voltage difference of the vector voltage based on the vector voltages at both ends of the loop closing point in the current operation mode; and calculating the loop closing current of the loop closing point by using the voltage difference and the equivalent impedance information.
According to an embodiment of the present invention, there is also provided an embodiment of a processor. Alternatively, in this embodiment, the above-described computer-readable storage medium may be used to store the program code executed by the loop closing current calculation method provided in embodiment 1 described above.
The embodiment of the application provides an electronic device, which comprises a processor, a memory and a program stored on the memory and capable of running on the processor, wherein the processor realizes the following steps when executing the program: the method comprises the steps of receiving vector voltage information uploaded by at least two voltage acquisition terminals, wherein the vector voltage information is used for representing vector voltages at two ends of a loop closing point of a bus tie switch; processing the vector voltage information by adopting a power grid simulation program to obtain equivalent reactance information of the loop closing point; calculating equivalent impedance information of the loop closing point in a plurality of different operation modes based on the equivalent reactance information, wherein the operation modes comprise at least one of the following: a high load operation mode, a flat load operation mode, and a low load operation mode; and calculating the loop closing current of the loop closing point based on each operation mode of the loop closing point and equivalent impedance information corresponding to each operation mode.
The application also provides a computer program product adapted to perform, when executed on a data processing device, a program initialized with the method steps of: the method comprises the steps of receiving vector voltage information uploaded by at least two voltage acquisition terminals, wherein the vector voltage information is used for representing vector voltages at two ends of a loop closing point of a bus tie switch; processing the vector voltage information by adopting a power grid simulation program to obtain equivalent reactance information of the loop closing point; calculating equivalent impedance information of the loop closing point in a plurality of different operation modes based on the equivalent reactance information, wherein the operation modes comprise at least one of the following: a high load operation mode, a flat load operation mode, and a low load operation mode; and calculating the loop closing current of the loop closing point based on each operation mode of the loop closing point and equivalent impedance information corresponding to each operation mode.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
In the foregoing embodiments of the present invention, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.
In the several embodiments provided in the present application, it should be understood that the disclosed technology may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of the units, for example, may be a logic function division, and may be implemented in another manner, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a usb disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (6)
1. A loop closing current calculation method, comprising:
vector voltage information uploaded by at least two voltage acquisition terminals is received, wherein the vector voltage information is used for representing vector voltages at two ends of a loop closing point of a bus tie switch;
processing the vector voltage information by adopting a power grid simulation program to obtain equivalent reactance information of the loop closing point;
Calculating equivalent impedance information of the loop closing point in a plurality of different operation modes based on the equivalent reactance information, wherein the operation modes comprise at least one of the following: a high load operation mode, a flat load operation mode, and a low load operation mode;
calculating a loop closing current of the loop closing point based on each operation mode of the loop closing point and equivalent impedance information corresponding to each operation mode;
Calculating equivalent impedance information of the loop closing point in a plurality of different operation modes based on the equivalent reactance information, wherein the equivalent impedance information comprises:
calculating equivalent resistances of the loop closing point in a plurality of different operation modes;
obtaining an equivalent impedance trend graph based on the equivalent resistance and the equivalent reactance information;
determining load section information in a plurality of running modes, wherein the load section is a moment section at any moment in the current running mode, and the load section information is used for reflecting the electric energy transmission capacity in the current running mode;
Determining equivalent impedance information in different running modes based on the equivalent impedance trend graph and the load section information;
each operation mode based on the loop closing point and equivalent impedance information corresponding to the operation mode are calculated to obtain loop closing current of the loop closing point, and the loop closing current calculation method comprises the following steps:
Vector subtraction is carried out on the basis of the vector voltages at the two ends of the loop closing point in the current operation mode, and the voltage difference of the vector voltages is calculated;
And calculating the loop closing current of the loop closing point by adopting the voltage difference and the equivalent impedance information.
2. The method of claim 1, wherein prior to said receiving the vector voltage information uploaded by the at least two voltage acquisition terminals, the method further comprises:
selecting the loop closing point of the bus tie switch according to the operation requirement of the power grid;
And based on the position information of the loop closing point, respectively installing at least one voltage acquisition terminal at two ends of the loop closing point.
3. The method of claim 1, wherein prior to said processing said vector voltage information using a grid simulation program to obtain equivalent reactance information for said loop closing point, said method further comprises:
Determining a transformer substation to which the ring closing point belongs and a management area of the transformer substation based on the position information of the ring closing point;
Determining a simulation range of the power grid simulation program based on the management area of the transformer substation, wherein the simulation range at least comprises: and a power grid and a related remote power supply of a management area of the transformer substation.
4. A closed loop current calculation device, the device comprising:
The receiving module is used for receiving vector voltage information uploaded by the at least two voltage acquisition terminals, wherein the vector voltage information is used for representing vector voltages at two ends of a loop closing point of the bus tie switch;
the processing module is used for processing the vector voltage information by adopting a power grid simulation program to obtain equivalent reactance information of the loop closing point;
The first calculation module is used for calculating equivalent impedance information of the loop closing point in a plurality of different operation modes based on the equivalent reactance information, wherein the operation modes comprise at least one of the following: a high load operation mode, a flat load operation mode, and a low load operation mode;
The second calculation module is used for calculating the loop closing current of the loop closing point based on each operation mode of the loop closing point and equivalent impedance information corresponding to each operation mode;
The first computing module includes:
the first calculation unit is used for calculating equivalent resistances of the loop closing point in a plurality of different operation modes;
The processing unit is used for obtaining an equivalent impedance trend graph based on the equivalent resistance and the equivalent reactance information;
The first determining unit is used for determining load section information in a plurality of running modes, wherein the load section is a moment section at any moment in the current running mode, and the load section information is used for reflecting the electric energy transmission capacity in the current running mode;
the second determining unit is used for determining equivalent impedance information in different running modes based on the equivalent impedance trend graph and the load section information;
the second computing module includes:
The second calculation unit is used for carrying out vector subtraction on the basis of the vector voltages at the two ends of the loop closing point in the current operation mode, and calculating the voltage difference of the vector voltages;
and the third calculation unit is used for calculating the loop closing current of the loop closing point by adopting the voltage difference and the equivalent impedance information.
5. A computer-readable storage medium, characterized in that the computer-readable storage medium includes a stored program, wherein the program, when run, controls a device in which the computer-readable storage medium is located to execute the closed loop current calculation method according to any one of claims 1 to 3.
6. An electronic device comprising a memory and a processor, characterized in that the memory has stored therein a computer program, the processor being arranged to run the computer program to perform the loop closing current calculation method of any of claims 1 to 3.
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