CN112345998A - Electric energy metering system and method under complex operation state of power grid - Google Patents
Electric energy metering system and method under complex operation state of power grid Download PDFInfo
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- CN112345998A CN112345998A CN202010967909.XA CN202010967909A CN112345998A CN 112345998 A CN112345998 A CN 112345998A CN 202010967909 A CN202010967909 A CN 202010967909A CN 112345998 A CN112345998 A CN 112345998A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
- G01R11/56—Special tariff meters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/08—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using analogue techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/10—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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Abstract
The invention discloses an electric energy metering system and method under a complex operation state of a power grid, which comprises the following steps: the parallel current transformer acquires current data of two buses in a double-bus closed-loop topological structure of a power grid; the method comprises the steps that a voltage transformer obtains voltage data of a high-voltage end on a primary side of a power grid; the analog quantity electric energy meter determines electric energy analog quantity data; the local module determines sum current data according to the current data of the two buses, and determines voltage and current data of a primary side high-voltage end of a power grid according to the sum current data and the voltage data; the digital electric energy meter determines electric energy digital quantity data; and the electric energy metering monitoring analysis device determines an electric charge metering mode of the power grid under the condition that the power of the upper grid and the power of the lower grid realize power ride through according to the voltage and current data, the electric energy analog quantity data and the electric energy digital quantity data. The invention can realize the metering of the demand electric energy of the power utilization system under the condition of power circulation in the power grid ring network architecture and realize the reasonable metering of the electric charge under the complex condition of reverse power of the two buses.
Description
Technical Field
The invention relates to the technical field of metering calibration, in particular to an electric energy metering system and method under a complex operation state of a power grid.
Background
Along with the construction of the energy Internet, more and more new energy sources are connected into the power distribution network. Because the new energy has the characteristics of randomness and wide distribution of energy supply, the power grid tide current can be changed to a certain extent along with the access of the new energy. Under the operation condition of the double-bus closed-loop topology of the power grid, the power energy tidal currents on the two lines of the double buses are transmitted and reversed as shown in fig. 1.
Under the complex operation condition of the power grid in fig. 1, the traditional electric energy metering mode adopts double-bus separated metering. However, due to different charging prices of the power of the upper and lower grids, when the directions of the power of the upper and lower grids are opposite, the double-bus separated metering power charge (P1 × power price of the lower grid — P2 × power price of the upper grid) and the metering power charge ((P1-P2) × power price of the lower grid) can generate power charge payment difference due to the difference between the charging prices of the power of the upper and lower grids, at this time, the actual consumed power of the system is (P1-P2) and the payment is carried out at the power price of the lower grid, while the traditional separated metering can meter part of the actual power (P2) in the actual power consumption above the power price of the upper grid, which causes economic dispute between the power grid and the power owner.
Disclosure of Invention
The invention provides an electric energy metering system and method under a complex operation state of a power grid, and aims to solve the problem of reasonable electric charge metering when complex conditions of reverse power of two buses in a double-bus closed-loop topological structure of the power grid are realized.
In order to solve the above problem, according to an aspect of the present invention, there is provided an electric energy metering system in a complex operation state of a power grid, the system including:
the parallel current transformer is respectively connected with the local module and the analog quantity electric energy meter and is used for acquiring current data of two buses in the double-bus closed-loop topological structure of the power grid;
the voltage transformer is respectively connected with the local module and the analog quantity electric energy meter and used for acquiring voltage data of a primary side high-voltage end of the power grid;
the analog quantity electric energy meter is connected with the electric energy metering monitoring analysis device and is used for determining electric energy analog quantity data in the form of analog quantity signals according to the voltage data and the current data of the two buses;
the local module is respectively connected with the digital electric energy meter and the electric energy metering, monitoring and analyzing device and is used for determining sum current data according to the current data of the two buses and determining voltage and current data of a high-voltage end at the primary side of the power grid according to the sum current data and the voltage data;
the digital electric energy meter is connected with the electric energy metering, monitoring and analyzing device and is used for determining electric energy digital quantity data in a digital signal form according to the voltage and current data;
and the electric energy metering monitoring analysis device is used for determining an electric charge metering mode of the power grid under the condition that the power of the upper grid and the power of the lower grid realize power ride through according to the voltage and current data, the electric energy analog quantity data and the electric energy digital quantity data.
Preferably, wherein the system further comprises:
and the exchanger is respectively connected with the on-site module, the electric energy metering monitoring analysis device and the digital electric energy meter and is used for sending the voltage and current data sent by the on-site module to the electric energy metering monitoring analysis device and the digital electric energy meter.
Preferably, the electric energy metering, monitoring and analyzing device determines, according to the voltage and current data, the electric energy analog quantity data and the electric energy digital quantity data, an electric charge metering mode of the power grid under the condition that power ride through is realized at the upper and lower grid powers, and includes:
checking the metering accuracy according to the electric energy analog quantity data and the electric energy digital quantity data;
after the measurement accuracy check is passed, determining the power directions of the two buses according to the voltage and current data, and determining whether power ride-through occurs according to the power directions; if the power direction is opposite, determining that power crossing occurs; if the power directions are the same, determining that no power crossing occurs;
when the power crossing is determined to occur, determining the electric charge metering mode as electric charge metering according to the electric energy digital quantity data; when the power crossing is determined not to occur, determining the electric charge metering mode as that the electric charge is metered according to the electric energy analog quantity data;
and determining the required electric charge according to the determined electric charge metering mode.
Preferably, the electric energy metering monitoring analysis device is further configured to:
and when the power crossing is determined to occur, determining the capacity electric charge calculated by the electric energy acquisition terminal according to the electric energy analog quantity data, and determining the charge to be withdrawn according to the difference value of the capacity electric charge and the required amount electric charge.
According to another aspect of the present invention, there is provided a method for measuring electric energy in a complex operating state of a power grid, the method comprising:
acquiring current data of two buses in a double-bus closed-loop topological structure of a power grid;
acquiring voltage data of a high-voltage end at the primary side of a power grid;
determining electric energy analog quantity data in the form of analog quantity signals according to the voltage data and the current data of the two buses;
determining sum current data according to the current data of the two buses, and determining voltage and current data of a primary side high-voltage end of a power grid according to the sum current data and the voltage data;
determining electric energy digital quantity data in the form of digital signals according to the voltage and current data;
and determining the electric charge metering mode of the power grid under the condition that the power of the upper and lower grids passes through the power according to the voltage and current data, the electric energy analog quantity data and the electric energy digital quantity data.
Preferably, wherein the method further comprises:
and transmitting the voltage and current data transmitted by the local module to the electric energy metering, monitoring and analyzing device and the digital electric energy meter by using a switch.
Preferably, the determining, according to the voltage and current data, the electric energy analog quantity data and the electric energy digital quantity data, an electric charge metering mode of the power grid under the condition that power ride through is realized by the upper and lower grid powers includes:
checking the metering accuracy according to the electric energy analog quantity data and the electric energy digital quantity data;
after the measurement accuracy check is passed, determining the power directions of the two buses according to the voltage and current data, and determining whether power ride-through occurs according to the power directions; if the power direction is opposite, determining that power crossing occurs; if the power directions are the same, determining that no power crossing occurs;
when the power crossing is determined to occur, determining the electric charge metering mode as electric charge metering according to the electric energy digital quantity data; when the power crossing is determined not to occur, determining the electric charge metering mode as that the electric charge is metered according to the electric energy analog quantity data;
and determining the required electric charge according to the determined electric charge metering mode.
Preferably, wherein the method further comprises:
and when the power crossing is determined to occur, determining the capacity electric charge calculated by the electric energy acquisition terminal according to the electric energy analog quantity data, and determining the charge to be withdrawn according to the difference value of the capacity electric charge and the required amount electric charge.
The invention provides an electric energy metering system and method under a complex operation state of a power grid, which determine an electric charge metering mode of the power grid under the condition that power of an upper grid and a lower grid realize power ride-through according to voltage and current data acquired by an electric energy metering detection analysis device and electric energy analog quantity data and electric energy digital quantity data acquired by an electric energy meter, can realize the electric energy metering of demand of a power utilization system under the condition that power circulation occurs in a ring network framework of the power grid, realize reasonable electric charge metering under the complex condition that the power of two buses in a double-bus closed loop topological structure of the power grid is reversed, can effectively solve the problem of electric charge metering difference dispute caused by different electric charges of the upper grid and the lower grid when the power flow of the power grid is changed due to randomness of new energy, and ensures the fairness and.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
FIG. 1 is a schematic diagram of power flow in a typical situation of a complex operation state of a power grid;
fig. 2 is a schematic structural diagram of an electric energy metering system 200 in a complex operation state of a power grid according to an embodiment of the present invention;
FIG. 3 is an architecture diagram of an electrical energy metering and analyzing system according to an embodiment of the present invention;
FIG. 4 is a flow chart of an electrical energy metering analysis according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a substation electric energy metering system under complex grid operating conditions according to an embodiment of the present invention;
fig. 6 is a flowchart of an electric energy metering method 600 in a complex operation state of a power grid according to an embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 2 is a schematic structural diagram of an electric energy metering system 200 in a complex operation state of a power grid according to an embodiment of the present invention. As shown in fig. 2, the electric energy metering system in the complex operation state of the power grid provided by the embodiment of the present invention can implement the electric energy metering of the demand of the power utilization system under the condition of power circulation occurring in the ring network architecture of the power grid, implement the reasonable electric charge metering under the complex condition of reverse power of two buses in the double-bus closed-loop topology structure of the power grid, effectively solve the dispute of electric charge metering difference caused by different electric charges of the upper and lower networks when the power flow of the power grid changes due to the randomness of new energy, and ensure the fairness and justice of the electric charge metering. The electric energy metering system 200 provided by the embodiment of the invention in the complex operation state of the power grid comprises: the system comprises a parallel current transformer 201, a voltage transformer 202, an analog electric energy meter 203, an on-site module 204, a digital electric energy meter 205 and an electric energy metering monitoring analysis device 206.
Preferably, the parallel current transformer 201 is connected to the local module and the analog electric energy meter, respectively, and is configured to obtain current data of two buses in the double-bus closed-loop topology of the power grid.
In the embodiment of the invention, two buses of a power grid are respectively provided with a current transformer, the two current transformers adopt a parallel connection mode, and each current transformer is used for measuring current data on the corresponding bus. The parallel current transformer can sum the current data of the two buses to determine sum current data, and the determined sum current data is used for the digital electric energy meter to measure electric energy.
Preferably, the voltage transformer 202 is connected to the local module and the analog electric energy meter, respectively, and is configured to obtain voltage data of the primary-side high-voltage terminal of the power grid.
Preferably, the analog quantity electric energy meter 203 is connected with an electric energy metering monitoring and analyzing device, and is configured to determine electric energy analog quantity data in the form of an analog quantity signal according to the voltage data and the current data of the two buses.
In the embodiment of the invention, two analog quantity electric energy meters are arranged, and the two analog quantity electric energy meters are respectively used for acquiring electric energy analog quantity data on corresponding buses. For any bus, the analog quantity electric energy meter determines electric energy analog quantity data corresponding to the analog quantity electric energy meter according to the current data and the voltage data on the bus, and one bus corresponds to one electric energy analog quantity data.
Preferably, the on-site module 204 is respectively connected to the digitized electric energy meter and the electric energy metering, monitoring and analyzing device, and is configured to determine sum current data according to current data of the two buses, and determine voltage and current data of the primary side high voltage end of the power grid according to the sum current data and the voltage data.
Preferably, wherein the system further comprises:
and the exchanger is respectively connected with the on-site module, the electric energy metering monitoring analysis device and the digital electric energy meter and is used for sending the voltage and current data sent by the on-site module to the electric energy metering monitoring analysis device and the digital electric energy meter.
In the embodiment of the invention, the local module is connected with the digital electric energy meter and the electric energy metering monitoring analysis device through the optical fiber switch. The local module acquires voltage data and current data of a primary side high-voltage end of a power grid from the voltage transformer and the parallel current transformer respectively so as to determine the voltage and current data, and sends the voltage and current data to the electric energy metering monitoring analysis device and the digital electric energy meter through the switch.
Preferably, the digital electric energy meter 205 is connected to the electric energy metering monitoring and analyzing device, and is configured to determine the electric energy digital quantity data in the form of digital signals according to the voltage and current data.
In the embodiment of the invention, the digital electric energy meter determines electric energy analog quantity data according to the sum current data and the voltage data of the two buses.
Preferably, the electric energy metering, monitoring and analyzing device 206 is configured to determine an electric charge metering mode of the power grid under the condition that power traversing of the upper grid and the lower grid is realized according to the voltage and current data, the electric energy analog quantity data and the electric energy digital quantity data.
Preferably, the electric energy metering, monitoring and analyzing device determines, according to the voltage and current data, the electric energy analog quantity data and the electric energy digital quantity data, an electric charge metering mode of the power grid under the condition that power ride through is realized at the upper and lower grid powers, and includes:
checking the metering accuracy according to the electric energy analog quantity data and the electric energy digital quantity data;
after the measurement accuracy check is passed, determining the power directions of the two buses according to the voltage and current data, and determining whether power ride-through occurs according to the power directions; if the power direction is opposite, determining that power crossing occurs; if the power directions are the same, determining that no power crossing occurs;
when the power crossing is determined to occur, determining the electric charge metering mode as electric charge metering according to the electric energy digital quantity data; when the power crossing is determined not to occur, determining the electric charge metering mode as that the electric charge is metered according to the electric energy analog quantity data;
and determining the required electric charge according to the determined electric charge metering mode.
Preferably, the electric energy metering monitoring analysis device is further configured to:
and when the power crossing is determined to occur, determining the capacity electric charge calculated by the electric energy acquisition terminal according to the electric energy analog quantity data, and determining the charge to be withdrawn according to the difference value of the capacity electric charge and the required amount electric charge.
Fig. 3 is an architecture diagram of an electric energy metering and analyzing system according to an embodiment of the present invention. As shown in fig. 3, the electric energy metering and analyzing system includes: the system comprises parallel current transformers (two CTs), a voltage transformer (PT), an on-site module (comprising a voltage on-site module and a current on-site module), a switch, a digital electric energy meter, two analog electric energy meters (one analog electric energy meter corresponds to one bus), an electric energy metering, monitoring and analyzing device and an electric energy acquisition terminal. In a metering point of a double-bus closed loop structure with new energy, a voltage transformer is used for measuring voltage of a ring network, and a current transformer is used for measuring current on two buses. Respectively metering the electric energy analog quantity data of the two buses by an analog quantity electric energy meter and uploading the electric energy analog quantity data to an electric energy metering monitoring analysis system; the on-site module and the digital electric energy meter are used for metering the sum electric energy on the two buses so as to obtain electric energy digital quantity data and upload the electric energy digital quantity data to the electric energy metering monitoring analysis device. The electric energy metering, monitoring and analyzing device analyzes the tide directions of the two buses, determines whether power crossing exists or not, and determines the electric charge metering mode according to the result of the power crossing.
Specifically, the electric energy metering and analyzing process of the present invention is as shown in fig. 4, the electric energy metering monitoring and analyzing device analyzes the metering points which may have charging disputes based on the power grid topological graph, when the electric energy directions of two or more metering points are the same, the electric energy of each point is respectively metered by the electric energy analog quantity data of the analog electric energy meter, when the electric energy directions of two or more metering points are opposite, the sum of the total electric energy is metered by the electric energy digital quantity data of the digital electric energy meter, and the electric charge payment is performed by combining the electric charges of the upper and lower networks. Specifically, firstly, checking the metering accuracy according to the electric energy analog quantity data and the electric energy digital quantity data; then, after the measurement accuracy check is passed, determining the power directions of the two buses according to the voltage and current data, and determining whether power ride-through occurs according to the power directions; if the power direction is opposite, determining that power crossing occurs; if the power directions are the same, determining that no power crossing occurs; then, when the power crossing is determined to occur, determining the electric charge metering mode as that the electric charge is metered according to the electric energy digital quantity data; when the power crossing is determined not to occur, determining the electric charge metering mode as that the electric charge is metered according to the electric energy analog quantity data; and finally, determining the required electric charge according to the determined electric charge metering mode. When the power directions of the double-bus upper grid and the double-bus lower grid are opposite, the electricity charge is measured in a mode of ((P1-P2) multiplied by the power price of the lower grid), and the required electricity charge is determined; (P1-P2) is for power supply.
In addition, in the embodiment of the invention, when it is determined that the power ride-through occurs, the electric energy metering and monitoring subsystem can also determine the capacity electric charge calculated by the electric energy acquisition terminal according to the electric energy analog quantity data, and determine the charge to be withdrawn according to the difference between the capacity electric charge and the demand electric charge.
Fig. 5 is a schematic diagram of a substation electric energy metering system under a complex grid operating condition according to an embodiment of the present invention. As shown in fig. 5, in order to verify the validity of this aspect, in the actual engineering, the digitized electric energy meter and the analog electric energy meter are used to collect the electric signals collected and measured by the voltage transformer and the current transformer on the two buses, and the two buses are separated from the measurement data and compared with the measurement data, so as to verify the accuracy of the measurement of the neutralization electric energy. The comparison result is shown in table 1, which verifies the effectiveness of the metering method of the present invention, wherein the measurement error of the metering system does not exceed 0.1% under the condition of determining the power source.
TABLE 1 comparison results
In the construction of an energy internet, along with the integration of a large amount of new energy, the method provided by the embodiment of the invention can effectively solve the dispute of electricity charge metering difference caused by different electricity charges of an upper network and a lower network when the power flow of a power grid changes due to the randomness of the new energy, and ensures the fairness and justness of the electricity charge metering, thereby having certain engineering significance.
Fig. 6 is a flowchart of an electric energy metering method 600 in a complex operation state of a power grid according to an embodiment of the present invention. As shown in fig. 6, in an electric energy metering method 600 in a complex operation state of a power grid according to an embodiment of the present invention, starting from step 601, current data of two buses in a double-bus closed-loop topology of the power grid is obtained in step 601.
In step 602, voltage data of the primary side high voltage side of the power grid is obtained.
In step 603, electric energy analog quantity data is determined in the form of an analog quantity signal according to the voltage data and the current data of the two buses.
In step 604, sum current data is determined according to the current data of the two buses, and voltage and current data of the primary side high voltage end of the power grid is determined according to the sum current data and the voltage data.
At step 605, digital quantity data of the electric energy is determined in the form of a digital signal from the voltage current data.
In step 606, according to the voltage and current data, the electric energy analog quantity data and the electric energy digital quantity data, an electric charge metering mode of the power grid under the condition that power ride through is realized by the upper and lower grid power is determined.
Preferably, wherein the method further comprises:
and transmitting the voltage and current data transmitted by the local module to the electric energy metering, monitoring and analyzing device and the digital electric energy meter by using a switch.
Preferably, the determining, according to the voltage and current data, the electric energy analog quantity data and the electric energy digital quantity data, an electric charge metering mode of the power grid under the condition that power ride through is realized by the upper and lower grid powers includes:
checking the metering accuracy according to the electric energy analog quantity data and the electric energy digital quantity data;
after the measurement accuracy check is passed, determining the power directions of the two buses according to the voltage and current data, and determining whether power ride-through occurs according to the power directions; if the power direction is opposite, determining that power crossing occurs; if the power directions are the same, determining that no power crossing occurs;
when the power crossing is determined to occur, determining the electric charge metering mode as electric charge metering according to the electric energy digital quantity data; when the power crossing is determined not to occur, determining the electric charge metering mode as that the electric charge is metered according to the electric energy analog quantity data;
and determining the required electric charge according to the determined electric charge metering mode.
Preferably, wherein the method further comprises:
and when the power crossing is determined to occur, determining the capacity electric charge calculated by the electric energy acquisition terminal according to the electric energy analog quantity data, and determining the charge to be withdrawn according to the difference value of the capacity electric charge and the required amount electric charge.
The electric energy metering method 600 in the complex operation state of the power grid according to the embodiment of the present invention corresponds to the electric energy metering system 200 in the complex operation state of the power grid according to another embodiment of the present invention, and details thereof are not repeated herein.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (8)
1. An electric energy metering system under a complex operation state of a power grid, characterized in that the system comprises:
the parallel current transformer is respectively connected with the local module and the analog quantity electric energy meter and is used for acquiring current data of two buses in the double-bus closed-loop topological structure of the power grid;
the voltage transformer is respectively connected with the local module and the analog quantity electric energy meter and used for acquiring voltage data of a primary side high-voltage end of the power grid;
the analog quantity electric energy meter is connected with the electric energy metering monitoring analysis device and is used for determining electric energy analog quantity data in the form of analog quantity signals according to the voltage data and the current data of the two buses;
the local module is respectively connected with the digital electric energy meter and the electric energy metering, monitoring and analyzing device and is used for determining sum current data according to the current data of the two buses and determining voltage and current data of a high-voltage end at the primary side of the power grid according to the sum current data and the voltage data;
the digital electric energy meter is connected with the electric energy metering, monitoring and analyzing device and is used for determining electric energy digital quantity data in a digital signal form according to the voltage and current data;
and the electric energy metering monitoring analysis device is used for determining an electric charge metering mode of the power grid under the condition that the power of the upper grid and the power of the lower grid realize power ride through according to the voltage and current data, the electric energy analog quantity data and the electric energy digital quantity data.
2. The system of claim 1, further comprising:
and the exchanger is respectively connected with the on-site module, the electric energy metering monitoring analysis device and the digital electric energy meter and is used for sending the voltage and current data sent by the on-site module to the electric energy metering monitoring analysis device and the digital electric energy meter.
3. The system of claim 1, wherein the electric energy metering, monitoring and analyzing device determines the electric charge metering mode of the power grid under the condition that the power of the upper grid and the power of the lower grid realize power ride through according to the voltage and current data, the electric energy analog quantity data and the electric energy digital quantity data, and the electric charge metering mode comprises the following steps:
checking the metering accuracy according to the electric energy analog quantity data and the electric energy digital quantity data;
after the measurement accuracy check is passed, determining the power directions of the two buses according to the voltage and current data, and determining whether power ride-through occurs according to the power directions; if the power direction is opposite, determining that power crossing occurs; if the power directions are the same, determining that no power crossing occurs;
when the power crossing is determined to occur, determining the electric charge metering mode as electric charge metering according to the electric energy digital quantity data; when the power crossing is determined not to occur, determining the electric charge metering mode as that the electric charge is metered according to the electric energy analog quantity data;
and determining the required electric charge according to the determined electric charge metering mode.
4. The system of claim 3, wherein the electric energy metering monitoring analysis device is further configured to:
and when the power crossing is determined to occur, determining the capacity electric charge calculated by the electric energy acquisition terminal according to the electric energy analog quantity data, and determining the charge to be withdrawn according to the difference value of the capacity electric charge and the required amount electric charge.
5. A method for metering electric energy in a complex operation state of a power grid is characterized by comprising the following steps:
acquiring current data of two buses in a double-bus closed-loop topological structure of a power grid;
acquiring voltage data of a high-voltage end at the primary side of a power grid;
determining electric energy analog quantity data in the form of analog quantity signals according to the voltage data and the current data of the two buses;
determining sum current data according to the current data of the two buses, and determining voltage and current data of a primary side high-voltage end of a power grid according to the sum current data and the voltage data;
determining electric energy digital quantity data in the form of digital signals according to the voltage and current data;
and determining the electric charge metering mode of the power grid under the condition that the power of the upper and lower grids passes through the power according to the voltage and current data, the electric energy analog quantity data and the electric energy digital quantity data.
6. The method of claim 5, further comprising:
and transmitting the voltage and current data transmitted by the local module to the electric energy metering, monitoring and analyzing device and the digital electric energy meter by using a switch.
7. The method according to claim 5, wherein the determining the electric charge metering mode of the power grid under the condition that the power of the upper grid and the power of the lower grid realize power ride through according to the voltage and current data, the electric energy analog quantity data and the electric energy digital quantity data comprises the following steps:
checking the metering accuracy according to the electric energy analog quantity data and the electric energy digital quantity data;
after the measurement accuracy check is passed, determining the power directions of the two buses according to the voltage and current data, and determining whether power ride-through occurs according to the power directions; if the power direction is opposite, determining that power crossing occurs; if the power directions are the same, determining that no power crossing occurs;
when the power crossing is determined to occur, determining the electric charge metering mode as electric charge metering according to the electric energy digital quantity data; when the power crossing is determined not to occur, determining the electric charge metering mode as that the electric charge is metered according to the electric energy analog quantity data;
and determining the required electric charge according to the determined electric charge metering mode.
8. The method of claim 7, further comprising:
and when the power crossing is determined to occur, determining the capacity electric charge calculated by the electric energy acquisition terminal according to the electric energy analog quantity data, and determining the charge to be withdrawn according to the difference value of the capacity electric charge and the required amount electric charge.
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