CN114221342A - Closed loop current calculation method and device, storage medium and electronic equipment - Google Patents
Closed loop current calculation method and device, storage medium and electronic equipment Download PDFInfo
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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: 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 a loop closing point; calculating equivalent impedance information of the loop closing point under 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 to obtain 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 prior art.
Description
Technical Field
The invention relates to the technical field of data processing, in particular to a closed loop current calculation method, a closed loop current calculation device, a storage medium and electronic equipment.
Background
When the power grid mode is changed before the power grid is overhauled and important guarantee is ensured, the power grid can carry out bus joining operation between the cross partitions. Because the current size after closing the loop can not be known by the dispatcher, the operation can be tried when the power grid load is small at night only by virtue of the operation experience, and the reason that the current size of closing the loop is too large is not only influenced by the local receiving end power grid load, but also relates to the current grid structure and power supply factors of the power grid, so that the current size of the possible current of closing the loop after closing the bus is sensed by the dispatcher depending on the local load size is often inaccurate, the too large current of closing the loop can cause the protection action of a circuit breaker of the bus or a load superior circuit, the impact can be caused to the power grid, and even the short-time power failure can be caused to a user.
The conventional method is mainly based on an offline simulation method and an online calculation and analysis method, the offline data analysis method is mainly used for calculating through mainstream simulation software by collecting offline power grid data, but the offline simulation calculation method is limited to the selected offline power grid data, has no real-time property and cannot guide actual production operation. Although the online calculation method has better real-time performance, under the limitation of the existing communication technology, the large-scale real-time accurate data acquisition is carried out on the power grid through the measurement devices such as the large-scale equal measurement devices, 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 by disconnection or acquisition errors of a plurality of points, and even the power flow is not converged, so that the calculation result cannot be obtained, and effective guidance on a dispatcher is lost.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the invention provides a loop closing current calculation method, a loop closing current calculation device, a storage medium and electronic equipment, and at least solves the technical problems that an offline calculation method of loop closing current in the prior art is poor in real-time performance and an online calculation method is high in maintenance cost.
According to an aspect of an embodiment of the present invention, there is provided a loop closing current calculation method, including: 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 ring closing point; calculating equivalent impedance information of the loop closing point under 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 to obtain 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 vector voltage information uploaded by at least two voltage acquisition terminals, the method further includes: selecting the ring closing point of the bus tie switch according to the operation requirement of a power grid; and respectively installing at least one voltage acquisition terminal at two ends of the ring closing point based on the position information of the ring closing point.
Optionally, before the vector voltage information is processed by using a power grid simulation program to obtain equivalent reactance information of the loop closing point, the method further includes: determining a substation to which the ring closing point belongs and a management area of the 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 substation, wherein the simulation range at least comprises: the power grid and associated remote power supplies of the management area of the substation.
Optionally, the calculating equivalent impedance information of the loop closing point in a plurality of different operation modes based on the equivalent reactance information includes: calculating equivalent resistance of the ring closing point under 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 under a plurality of operation modes, wherein the load section is a time section at any moment under the current operation mode, and the load section information is used for reflecting the electric energy transmission capacity under the current operation mode; and determining equivalent impedance information under 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 equivalent impedance information corresponding to the operation mode includes: calculating a voltage difference of the vector voltages based on the vector voltages at two ends of the loop closing point in the current operation mode; and calculating to obtain 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 embodiments of the present invention, there is also provided a loop closing current calculation apparatus, including: the receiving module is used for 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 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; a first calculating module, 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: a first calculating unit, configured to calculate equivalent resistances of the ring 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; a first determining unit, configured to determine load section information in a plurality of operating modes, where the load section is a current time section at any time in the operating mode, and the load section information is used to reflect an electric energy transmission capability in the current operating mode; and the second determining unit is used for determining equivalent impedance information under different operation modes based on the equivalent impedance trend graph and the load section information.
Optionally, the second calculating module includes: a second calculating unit, configured to calculate a voltage difference of the vector voltages based on the vector voltages at two ends of the loop closing point in the current operating mode; and the third calculating unit is used for calculating the loop closing current of the loop closing point by adopting the voltage difference and the equivalent impedance information.
According to another aspect of the embodiments of the present invention, there is also provided a computer-readable storage medium, where the computer-readable storage medium includes a stored program, and when the program runs, the apparatus where the computer-readable storage medium is located is controlled to execute any one of the loop closing current calculation methods.
According to another aspect of the embodiments 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 execute the computer program to perform any one of the loop closing current calculation methods described above.
In the embodiment of the invention, 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 ring closing point; calculating equivalent impedance information of the loop closing point under 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 loop closing current of the loop closing point is calculated and obtained based on each operation mode of the loop closing point and equivalent impedance information corresponding to each operation mode, the purpose of collecting 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 accurately in real time is achieved, and the technical problems that an off-line calculation method of the loop closing current in the prior art is poor in real time performance and an on-line calculation method is high in maintenance cost are solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a flow chart of a loop closing current calculation method according to an embodiment of the present 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 power grid simulation program impedance calculation flow according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an alternative current waveform for a steady-state loop closing current in accordance with an embodiment of the present invention;
FIG. 5 is a schematic illustration of an alternative loop closing transient current waveform in accordance with an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a closed loop current calculating device according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or 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
In accordance with 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 figure may be executed 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 executed in an order different from that shown.
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 under a plurality of different operation modes based on the equivalent reactance information, wherein the operation modes comprise at least one of the following modes: a high load operation mode, a flat load operation mode and a low load operation mode;
and step S108, calculating to obtain 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.
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 operating modes are selected, for example: calculating equivalent impedance information of the ring closing point in a plurality of typical operation modes based on the equivalent reactance information in a high-load operation mode, a peak load operation mode and a low-load operation mode; and finally, calculating to obtain 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 bus tie switch; the above operation modes include: high load operation mode, flat load operation mode, low load operation mode, etc.
As an optional embodiment, the voltage acquisition terminal is adopted to acquire the vector voltage information at a proper frequency, when the vector voltage information is processed by the simulation program, a management power grid area of a substation to which an acquired loop closing point belongs needs to be determined in advance, the whole power grid area is simulated, and loop closing current is obtained through calculation; the reactance, impedance and other information of each operation mode at different moments are recorded and stored in the calculation process, and when loop closing current is calculated subsequently, the loop closing current can be calculated according to the stored impedance information and displayed in real time so as to be convenient for power grid dispatching personnel to refer and operate.
The embodiment of the invention reasonably combines the online data real-time acquisition and the offline simulation results, has low cost, effectively solves 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, provides a method which has strong practicability and can be used in a large scale for high-reliability switching operation of an urban power grid, obviously improves the reliability of operation, has controllable cost and high calculation precision, adopts a latest 5G vector acquisition terminal compared with the traditional PMU (power grid vector voltage acquisition device), changes the method of calculating an effective value and uploading the effective value used by the PMU into the method of uploading the full voltage and then processing the background because the output data is not limited, so that a background processor is not limited by the processing capacity of a simulation system in a substation, the data processing capacity is stronger, and the optional processing equipment is more various. Meanwhile, the voltage acquisition terminal does not need to process acquired data, and is smaller and smaller, and the installation limitation is lower.
In an optional embodiment, before receiving the vector voltage information uploaded by 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;
and step S204, respectively installing at least one voltage acquisition terminal at two ends of the ring closing point based on the position information of the ring closing point.
In the embodiment of the invention, when the voltage acquisition terminal is installed, the operation requirement of a power grid needs to be considered, and the ring closing point of the bus tie switch is selected according to the operation requirement of the power grid; after the loop closing point position is determined, the voltage acquisition terminals are respectively installed at two ends of the loop closing point to acquire vector voltage information of the two ends of the loop closing point.
As an optional embodiment, in the installation process, the site needs to be surveyed in advance, relevant design drawings need to be checked, online installation is performed under safe operation regulations, sites with high requirements for loop closing and switching are collected according to the requirements of power grid production and operation, then a bus tie switch is selected from a site with high operation failure rate (namely, low loop closing success rate) by virtue of the experience of scheduling operators, 5G virtual acquisition terminals are installed at the wire inlet positions at 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 acquiring the vector voltage information, an acquisition frequency f needs to be preset, where f is 1/n, and n is a sampling point acquired in 1 second, and in order to meet the requirement of transient closed loop acquisition, the sampling point is recommended to be above 32k, that is, 3200 times of vector acquisition are performed on the voltage in one second. And adding the synchronous vector voltages collected at the two ends of the bus to the time scale of the corresponding moment 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) } where t is the start time of acquisition, m is the acquisition time scale, and m ∈ [0, 1/n, 2/n … ], U1 and U2 are the synchronous vector voltages acquired at two ends of the bus respectively.
In an optional embodiment, before the processing the vector voltage information by using a grid simulation program to obtain equivalent reactance information of the loop closing point, the method further includes:
step S302, determining a substation to which the ring closing point belongs and a management area of the 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 associated remote power supplies of the management area of the substation.
In the embodiment of the invention, after the ring closing point position is determined, the substation to which the ring closing point belongs is determined according to the position information of the ring closing point, and the management area of the substation is determined; and determining the range of the power grid simulation program required to be simulated based on the management area of the transformer substation.
Before performing simulation processing on the vector voltage information, acquiring parameter collection of a management area of the substation, performing parameter conversion processing on the collected parameters, and converting the collected parameters to per unit values required by a simulation system; as shown in a schematic diagram of a reactance calculation process of a power grid simulation program shown in fig. 2, after data conversion and determination of a simulation range are completed, simulation modeling is performed on a power grid in a management area of the transformer substation, a modeling scale is to be covered with power grids of all lines and related remote power supplies related to a selected transformer substation upper stage, and a power grid can be built by using an electromechanical simulation program, for example: the power system analysis comprehensive program comprises a Chinese power science research institute program BPA program, a power system analysis comprehensive program PSASP and the like; and after the building is finished, calculating the vector voltage information by using a simulation system to obtain equivalent reactance information of the ring closing point.
In an alternative embodiment, the calculating 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 the equivalent resistance of the ring closing point under 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 under a plurality of operation modes, wherein the load section is a time section at any moment under the current operation mode, and the load section information is used for reflecting the electric energy transmission capacity under the current operation mode;
step S408, equivalent impedance information under different operation modes is determined based on the equivalent impedance trend graph and the load section information.
In the embodiment of the invention, equivalent resistance of the ring closing point under a plurality of different operation modes is calculated based on the equivalent reactance information, and an equivalent impedance trend graph is constructed; and determining load section information under a plurality of operation modes, and determining equivalent impedance information under different operation modes based on the equivalent impedance trend graph and the load section information.
The load profile is a time profile at any time in the current operating mode, and the load profile information is used to reflect the power transmission capability in the current operating mode.
As an optional embodiment, as shown in a schematic diagram of an impedance calculation flow of a power grid simulation program in fig. 3, in the built power grid simulation program, a time section of three power grid times of a power grid peak, a power grid peak and a power grid valley (high load, peak load, and low load) is selected, and related information such as power plant output, power grid load and the like related to the power grid is filled into the simulation program on the time section, and simulation load flow debugging is performed to ensure that the power flow in the built power grid is reasonable, the reactive power of a power system is balanced, and the power grid data is correct. Then according to the selected transformer substation with the closed loop point, equivalent impedances Zeq under different operation modes are calculated by changing loads carried by the closed loop point and loads of a subarea where the closed loop point is located, adjusting force of the subarea unit, starting and stopping the subarea unit and stopping a main network element; equivalent impedance trend graph is formed by calculating equivalent resistance under different modes, main factors of equivalent impedance influence are analyzed to form typical equivalent impedance of the power grid under the load condition, and the power grid time loop closing at different load sections of the power grid is calculated in sequence by the methodPoint equivalent impedances Zeq, e.g. ZeqHigh load、ZeqLoad at peak、ZeqLow load。
It should be noted that the analysis of the above-mentioned equivalent impedance influence main factors includes: influence factors of the power grid structure: combing all relevant maintenance modes of the station, namely a line maintenance mode in a subarea where the station is located and a substation maintenance mode in the subarea where the station is located; influence factors of power supplies in the network: carding all starting modes of power plants in the subarea where the station is located; load influence factors in the network: combing all load changes of the station and all load changes of the subarea where the station is located; and (3) 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 required by the calculation of the station is finally obtained, and three typical impedances Zeq are finally obtained by taking the high-load, flat-peak load and low-load operation modes as examples.
In an alternative embodiment, the 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 the operation mode includes:
step S502, calculating the voltage difference of the vector voltages based on the vector voltages at the two ends of the loop closing point in the current operation mode;
and step S504, calculating to obtain loop closing current of the loop closing point by using the voltage difference and the equivalent impedance information.
In the embodiment of the present invention, a voltage difference of the vector voltages is calculated based on the vector voltages at two ends of the loop closing point in the current operating mode; and calculating to obtain 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 time of the loop closing point are subjected to vector subtraction to form delta U, and a sequence { delta U (t + m), delta U (t + m1), …, delta U (t + mn) } is formed at the same time, m is an acquisition time scale, m belongs to [0, 1/n, 2/n … ], and n is a sampling point acquired in 1 second; according to the selected time, selecting a power grid typical mode corresponding to the time and a Zeq obtained before the mode; and (3) calculating the closed loop current in real time: if n is 32K, i.e. every 1/3200 seconds, the loop closing current at this moment is obtained, and the current waveform diagram when the loop closing current is the steady-state loop closing current is shown in fig. 4. Through derivation of a differential equation for loop closing current calculation, because the angle of a voltage phase angle at the loop closing time is difficult to know, the most serious condition is processed in the calculation, a loop closing instantaneous current diagram shown in figure 5 is obtained, and the relation between transient current and steady-state current is obtained; and finally, displaying the obtained delta U, the closed-loop steady-state current and the closed-loop transient-state current in real time so as to be convenient for power grid dispatching personnel to refer 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 current after loop closing and can only operate by experience when switching operation is carried out is solved at low cost, the embodiment of the invention provides a method which is strong in practicability and can be used in a large scale for the high-reliability switching operation of an urban power grid, the reliability of the operation is obviously improved, the cost is controllable, the calculation precision is high, the purpose of collecting the vector voltage of a loop 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 realized, and the technical problems that the offline calculation method of the loop closing current in the prior art is poor in real-time performance and the online calculation method is high in maintenance cost are solved.
Example 2
According to an embodiment of the present invention, an embodiment of an apparatus for implementing the loop closing current calculation method is further provided, which is implemented or realized by an evaluation system of a cloud data platform, and fig. 6 is a schematic structural diagram of an apparatus for calculating a loop closing current according to an embodiment of the present invention, as shown in fig. 6, the apparatus includes: a receiving module 60, a processing module 62, a first calculating module 64 and a second calculating 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 represent vector voltages at two ends of a loop closing point of a bus tie switch;
a processing module 62, 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 calculating 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;
and a second calculating module 66, 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.
It should be noted here that 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 corresponding steps in the implementation example and application scenario, but are not limited to the disclosure in embodiment 1.
Optionally, the first computing module includes: a first calculating unit, configured to calculate equivalent resistances of the ring 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; a first determining unit, configured to determine load section information in a plurality of operating modes, where the load section is a current time section at any time in the operating mode, and the load section information is used to reflect an electric energy transmission capability in the current operating mode; and the second determining unit is used for determining equivalent impedance information under different operation modes based on the equivalent impedance trend graph and the load section information.
Optionally, the second calculating module includes: a second calculating unit, configured to calculate a voltage difference of the vector voltages based on the vector voltages at two ends of the loop closing point in the current operating mode; and the third calculating unit is used for calculating the loop closing current of the loop closing point by adopting the voltage difference and the equivalent impedance information.
It should be noted that, reference may be made to the relevant description in embodiment 1 for a preferred implementation of this embodiment, and details are not described here again.
Embodiments of a computer-readable storage medium are also provided according to embodiments of the present invention. Optionally, in this embodiment, the computer-readable storage medium may be used to store the program code executed by the loop closing current calculation method provided in embodiment 1.
Optionally, in this embodiment, the computer-readable storage medium may be located in any one of computer terminals in a computer terminal group in a computer network, or in any one of mobile terminals in a mobile terminal group.
Optionally, in this embodiment, the computer readable storage medium is configured to store program codes for performing the following steps: 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 ring closing point; calculating equivalent impedance information of the loop closing point under 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 to obtain 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 computer-readable storage medium is configured to store program codes for performing the following steps: selecting the ring closing point of the bus tie switch according to the operation requirement of a power grid; and respectively installing at least one voltage acquisition terminal at two ends of the ring closing point based on the position information of the ring closing point.
Optionally, the computer-readable storage medium is configured to store program codes for performing the following steps: determining a substation to which the ring closing point belongs and a management area of the 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 substation, wherein the simulation range at least comprises: the power grid and associated remote power supplies of the management area of the substation.
Optionally, the computer-readable storage medium is configured to store program codes for performing the following steps: calculating equivalent resistance of the ring closing point under 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 under a plurality of operation modes, wherein the load section is a time section at any moment under the current operation mode, and the load section information is used for reflecting the electric energy transmission capacity under the current operation mode; and determining equivalent impedance information under different operation modes based on the equivalent impedance trend graph and the load section information.
Optionally, the computer-readable storage medium is configured to store program codes for performing the following steps: calculating a voltage difference of the vector voltages based on the vector voltages at two ends of the loop closing point in the current operation mode; and calculating to obtain the loop closing current of the loop closing point by using the voltage difference and the equivalent impedance information.
Embodiments of a processor are also provided according to embodiments of the present invention. Optionally, in this embodiment, the computer-readable storage medium may be used to store the program code executed by the loop closing current calculation method provided in embodiment 1.
The embodiment of the application provides an electronic device, the device comprises a processor, a memory and a program which is stored on the memory and can be run on the processor, and the processor executes the program and realizes the following steps: 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 ring closing point; calculating equivalent impedance information of the loop closing point under 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 to obtain 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 present application further provides a computer program product adapted to perform a program for initializing the following method steps when executed on a data processing device: 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 ring closing point; calculating equivalent impedance information of the loop closing point under 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 to obtain 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 above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
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 can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A closed loop current calculation method is characterized by comprising the following steps:
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 ring 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 to obtain 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.
2. The method of claim 1, wherein prior to said receiving vector voltage information uploaded by at least two voltage acquisition terminals, the method further comprises:
selecting the ring closing point of the bus tie switch according to the operation requirement of a power grid;
and respectively installing at least one voltage acquisition terminal at two ends of the ring closing point based on the position information of the ring closing point.
3. The method of claim 1, wherein before the processing the vector voltage information with a grid simulation program to obtain equivalent reactance information for the loop closing point, the method further comprises:
determining a substation to which the ring closing point belongs and a management area of the substation based on the position information of the ring closing point;
determining a simulation range of the power grid simulation program based on a management area of the substation, wherein the simulation range at least comprises: a power grid and associated remote power supplies of a management area of the substation.
4. The method of claim 1, wherein said calculating equivalent impedance information for the loop closure point in a plurality of different operating modes based on the equivalent reactance information comprises:
calculating equivalent resistance of the ring closing point under 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 under a plurality of operation modes, wherein the load section is a time section at any moment under the current operation mode, and the load section information is used for reflecting the electric energy transmission capacity under the current operation mode;
and determining equivalent impedance information under different operation modes based on the equivalent impedance trend graph and the load section information.
5. The method of claim 1, wherein 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 the operation mode comprises:
calculating the voltage difference of the vector voltage based on the vector voltage at two ends of the ring closing point in the current operation mode;
and calculating to obtain the loop closing current of the loop closing point by using the voltage difference and the equivalent impedance information.
6. A closed loop current calculation apparatus, the apparatus comprising:
the receiving module is used for 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 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 ring closing point;
a first calculating module, 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.
7. The apparatus of claim 6, wherein the first computing module comprises:
the first calculating unit is used for calculating equivalent resistance of the ring closing point under 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 under a plurality of operation modes, wherein the load section is a time section at any moment under the current operation mode, and the load section information is used for reflecting the electric energy transmission capacity under the current operation mode;
and the second determination unit is used for determining equivalent impedance information under different operation modes based on the equivalent impedance trend graph and the load section information.
8. The apparatus of claim 6, wherein the second computing module comprises:
the second calculation unit is used for calculating the voltage difference of the vector voltage based on the vector voltage at two ends of the loop closing point in the current operation mode;
and the third calculating unit is used for calculating the loop closing current of the loop closing point by adopting the voltage difference and the equivalent impedance information.
9. A computer-readable storage medium, comprising a stored program, wherein the program, when executed, controls an apparatus in which the computer-readable storage medium is located to perform the loop closing current calculation method according to any one of claims 1 to 5.
10. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the computer program to perform the loop closing current calculation method according to any one of claims 1 to 5.
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