CN111679239A - System and method for verifying voltage transformer for flexible direct-current power grid - Google Patents
System and method for verifying voltage transformer for flexible direct-current power grid Download PDFInfo
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- CN111679239A CN111679239A CN202010716344.8A CN202010716344A CN111679239A CN 111679239 A CN111679239 A CN 111679239A CN 202010716344 A CN202010716344 A CN 202010716344A CN 111679239 A CN111679239 A CN 111679239A
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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
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The embodiment of the invention provides a system and a method for verifying a voltage transformer for a flexible direct-current power grid, wherein the method comprises the following steps: the method comprises the following steps that a direct current error measuring instrument collects a standard direct current voltage output by a standard direct current voltage transformer and a direct current voltage to be verified output by a voltage transformer to be verified, wherein the voltage transformer to be verified is a voltage transformer for a flexible direct current power grid; according to the standard direct-current voltage, verifying the direct-current voltage to be verified; after the direct current voltage to be verified passes verification, the alternating current error measuring instrument collects a standard alternating current voltage output by the standard alternating current voltage transformer and an alternating current voltage to be verified output by the voltage transformer to be verified; and verifying the alternating voltage to be verified according to the standard alternating voltage. According to the invention, the alternating current accuracy of the voltage transformer is considered, the direct current voltage calibration and the alternating current voltage calibration are carried out on the voltage transformer to be calibrated, the calibration accuracy of the voltage transformer is improved, and the requirement of a flexible direct current power grid on the voltage transformer can be met.
Description
Technical Field
The invention relates to the technical field of equipment calibration, in particular to a system and a method for calibrating a voltage transformer for a flexible direct-current power grid.
Background
This section is intended to provide a background or context to the embodiments of the invention that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.
The flexible direct-current transmission is used as a new generation direct-current transmission technology, is an important support for constructing a strong intelligent power grid, and compared with a traditional direct-current transmission mode, the flexible direct-current transmission adopts a voltage source converter, a turn-off device and high-frequency modulation, has the technical advantages of high reliability, strong regulation and control performance, easiness in constructing a multi-end system and the like, has important application in the aspects of urban power grid capacity increase, alternating-current and direct-current networking, island power supply and the like, and is a strategic choice for changing the development pattern of a large power grid. Compared with the conventional direct current transmission project, the flexible direct current transmission system is flexible in operation mode, good in connectivity with a weak current alternating current system, good in harmonic characteristic and capable of greatly reducing the installation area. However, the impedance of a direct-current side fault loop of the flexible direct-current transmission system is very small, and large fault current is easily generated. The voltage transformer for the flexible direct-current power grid is a voltage transformer with higher sampling speed and larger frequency bandwidth, is one of core devices of a direct-current power transmission project, provides an accurate and reliable data source for control, protection and measurement of a system, and has measurement accuracy directly related to safe and stable operation of the flexible direct-current power transmission project.
Compared with the traditional direct current voltage transformer, the voltage transformer for the flexible direct current power grid needs to simultaneously meet the requirements of measurement and protection for two different types of direct current and alternating current primary side equipment, but the existing calibration method can only carry out on-site calibration on the direct current accuracy, so that the error of the voltage transformer calibration is large, and the requirements of the flexible direct current power grid are difficult to meet.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the invention provides a voltage transformer calibration system for a flexible direct-current power grid, which is used for improving the calibration precision of the voltage transformer for the flexible direct-current power grid, and comprises the following components:
direct current verifying attachment and interchange verifying attachment, wherein:
the DC verification device includes: a standard direct current voltage transformer and a direct current error measuring instrument;
the direct current error measuring instrument is used for collecting a standard direct current voltage output by a standard direct current voltage transformer and a direct current voltage to be checked output by a voltage transformer to be checked, wherein the voltage transformer to be checked is a voltage transformer for a flexible direct current power grid; according to the standard direct-current voltage, verifying the direct-current voltage to be verified;
the AC verification device includes: a standard alternating current voltage transformer and an alternating current error measuring instrument;
the alternating current error measuring instrument is used for collecting standard alternating current voltage output by the standard alternating current voltage transformer and alternating current voltage to be verified output by the voltage transformer to be verified after the direct current voltage to be verified passes verification; and verifying the alternating voltage to be verified according to the standard alternating voltage.
The embodiment of the invention provides a method for checking a voltage transformer for a flexible direct-current power grid, which is applied to the voltage transformer checking system and used for improving the checking precision of the voltage transformer for the flexible direct-current power grid, and comprises the following steps:
the method comprises the following steps that a direct current error measuring instrument collects a standard direct current voltage output by a standard direct current voltage transformer and a direct current voltage to be verified output by a voltage transformer to be verified, wherein the voltage transformer to be verified is a voltage transformer for a flexible direct current power grid;
the direct current error measuring instrument verifies the direct current voltage to be verified according to the standard direct current voltage;
after the direct current voltage to be verified passes verification, the alternating current error measuring instrument collects a standard alternating current voltage output by the standard alternating current voltage transformer and an alternating current voltage to be verified output by the voltage transformer to be verified;
and the alternating current error measuring instrument is used for verifying the alternating current voltage to be verified according to the standard alternating current voltage.
The embodiment of the invention provides computer equipment which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the processor is used for realizing the voltage transformer checking method for the flexible direct current power grid when executing the computer program.
The embodiment of the invention provides a computer-readable storage medium, wherein a computer program for executing the voltage transformer verification method for the flexible direct current power grid is stored in the computer-readable storage medium.
The embodiment of the invention comprises the following steps: the method comprises the following steps that a direct current error measuring instrument collects a standard direct current voltage output by a standard direct current voltage transformer and a direct current voltage to be verified output by a voltage transformer to be verified, wherein the voltage transformer to be verified is a voltage transformer for a flexible direct current power grid; according to the standard direct-current voltage, verifying the direct-current voltage to be verified; after the direct current voltage to be verified passes verification, the alternating current error measuring instrument collects a standard alternating current voltage output by the standard alternating current voltage transformer and an alternating current voltage to be verified output by the voltage transformer to be verified; and verifying the alternating voltage to be verified according to the standard alternating voltage. According to the invention, the alternating current accuracy of the voltage transformer is considered, the direct current voltage calibration and the alternating current voltage calibration are carried out on the voltage transformer to be calibrated, the calibration accuracy of the voltage transformer is improved, and the requirement of a flexible direct current power grid on the voltage transformer can be met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts. In the drawings:
fig. 1 is a schematic diagram of a structure of a voltage transformer verification system for a flexible direct-current power grid in an embodiment of the invention;
fig. 2 is a schematic diagram of a specific structure of a dc calibration apparatus 01 according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a specific structure of an ac verification apparatus 02 according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a process of a voltage transformer verification method for a flexible direct-current power grid in the embodiment of the invention;
fig. 5 is a schematic diagram of a flow chart according to an embodiment of the present invention.
Detailed Description
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.
As will be appreciated by one skilled in the art, embodiments of the present invention may be embodied as a system, apparatus, method or computer program product. Accordingly, the present disclosure may be embodied in the form of: entirely hardware, entirely software (including firmware, resident software, micro-code, etc.), or a combination of hardware and software.
In order to solve the technical problem that in the prior art, only the dc accuracy is checked when the voltage transformer for the flexible dc power grid is checked, so that the error of the voltage transformer check is large and the requirement of the flexible dc power grid is difficult to meet, an embodiment of the present invention provides a voltage transformer check system for the flexible dc power grid, which is used for improving the check precision of the voltage transformer for the flexible dc power grid, fig. 1 is a schematic diagram of a structure of the voltage transformer check system for the flexible dc power grid in the embodiment of the present invention, and as shown in fig. 1, the system includes:
direct current verifying attachment 01 and interchange verifying attachment 02, wherein:
the DC verification device includes: a standard direct current voltage transformer 011 and a direct current error measuring instrument 012;
the direct current error measuring instrument 012 is used for acquiring a standard direct current voltage output by the standard direct current voltage transformer 011 and a to-be-checked direct current voltage output by the to-be-checked voltage transformer, wherein the to-be-checked voltage transformer is a voltage transformer for a flexible direct current power grid; according to the standard direct-current voltage, verifying the direct-current voltage to be verified;
the ac verification device 02 includes: a standard alternating voltage transformer 021 and an alternating error measuring instrument 022;
the alternating current error measuring instrument 022 is used for collecting the standard alternating current voltage output by the standard alternating current voltage transformer 021 and the alternating current voltage to be verified output by the voltage transformer to be verified after the direct current voltage to be verified passes verification; and verifying the alternating voltage to be verified according to the standard alternating voltage.
As shown in fig. 1, an embodiment of the present invention is implemented by: the method comprises the following steps that a direct current error measuring instrument collects a standard direct current voltage output by a standard direct current voltage transformer and a direct current voltage to be verified output by a voltage transformer to be verified, wherein the voltage transformer to be verified is a voltage transformer for a flexible direct current power grid; according to the standard direct-current voltage, verifying the direct-current voltage to be verified; after the direct current voltage to be verified passes verification, the alternating current error measuring instrument collects a standard alternating current voltage output by the standard alternating current voltage transformer and an alternating current voltage to be verified output by the voltage transformer to be verified; and verifying the alternating voltage to be verified according to the standard alternating voltage. According to the invention, the alternating current accuracy of the voltage transformer is considered, the direct current voltage calibration and the alternating current voltage calibration are carried out on the voltage transformer to be calibrated, the calibration accuracy of the voltage transformer is improved, and the requirement of a flexible direct current power grid on the voltage transformer can be met.
Fig. 2 is a schematic diagram of a specific structure of a dc calibration apparatus 01 according to an embodiment of the present invention, and as shown in fig. 2, in an embodiment, the dc calibration apparatus 01 further includes: a dc voltage source 013 for outputting a dc voltage;
the output end of the direct current voltage source 013 is electrically connected with the input end of the standard direct current voltage transformer 011; the output end of the direct-current voltage source 013 is electrically connected with the input end of the voltage transformer to be verified;
during specific implementation, the check-up of flexible voltage transformer for direct current power grid error can include multiple condition such as inspection before the commissioning, inspection first after the commissioning, periodic check, interim inspection, when the check-up, can insert direct current verifying attachment 01 with the mode that waits to check-up voltage transformer according to fig. 2 shows, include: the input end of the standard direct current voltage transformer 011 and the input end of the voltage transformer to be verified are respectively and electrically connected with the output end of the direct current voltage source 013, and the output end of the standard direct current voltage transformer 011 and the output end of the voltage transformer to be verified are respectively and electrically connected with the direct current error measuring instrument 012.
In one embodiment, the dc error measuring instrument 012 is configured to check the dc voltage to be checked, including:
determining the error of the direct current voltage to be verified according to the standard direct current voltage and the direct current voltage to be verified;
when the error of the direct current voltage to be verified is smaller than or equal to a first preset threshold value, determining that the direct current voltage to be verified passes verification;
when the error of the direct current voltage to be verified is larger than a first preset threshold value, the following operations are executed in a circulating mode until the error of the direct current voltage to be verified is smaller than or equal to the first preset threshold value:
sending an instruction for adjusting the compensation capacitor of the voltage transformer to be verified;
and checking the regulated direct current voltage to be checked output by the voltage transformer to be checked.
In one embodiment, the dc error meter 012 is specifically configured to:
and according to the first synchronous trigger instruction, synchronously acquiring the standard direct current voltage output by the standard direct current voltage transformer and the direct current voltage to be verified output by the voltage transformer to be verified.
In specific implementation, as shown in fig. 2, by adjusting the output of the dc voltage source 013, the dc error measuring instrument 012 can synchronously acquire the standard dc voltage U output by the standard dc voltage transformer 011 according to the synchronous trigger commandRAnd the direct current voltage U to be verified output by the voltage transformer to be verified after being analyzed by the digital frame formatMWherein the voltage transformer to be checked is a voltage transformer for a flexible direct current power grid, and then, a standard direct current voltage U is calculatedRAnd DC voltage U to be checkedMError X between1Error X1May be URAnd UMError of ratio of (2) at error X1When the voltage is less than or equal to a first preset threshold value, the direct-current voltage output by the voltage transformer to be verified is considered to meet the requirementSubsequent operations may be performed, wherein the first preset threshold may be a dc error threshold; at error X1When the error is larger than the first preset threshold value, sending an instruction for adjusting the compensation capacitor of the voltage transformer to be verified, then verifying the direct current voltage to be verified output by the adjusted voltage transformer to be verified, and repeatedly executing the operation until the error X is reached1And when the voltage is smaller than or equal to the first preset threshold, the direct-current voltage output by the voltage transformer to be verified meets the requirement, and subsequent operation can be performed.
Fig. 3 is a schematic diagram of a specific structure of an ac verification apparatus 02 according to an embodiment of the present invention, and as shown in fig. 3, in an embodiment, the ac verification apparatus 02 further includes: an ac voltage source 023 for outputting an ac voltage;
the output end of the alternating current voltage source 023 is electrically connected with the input end of a standard alternating current voltage transformer 021; the output end of the ac voltage source 023 is electrically connected with the input end of the voltage transformer to be verified.
In specific implementation, after the dc voltage output by the voltage transformer to be verified meets the requirement, the voltage transformer to be verified can be accessed to the ac verification device 02 according to the mode shown in fig. 3, which includes: an input end of a standard alternating current voltage transformer 021 and an input end of a to-be-verified voltage transformer are respectively and electrically connected with an output end of an alternating current voltage source 023, and an output end of the standard alternating current voltage transformer 021 and an output end of the to-be-verified voltage transformer are respectively and electrically connected with an alternating current error measuring instrument 022.
In one embodiment, the ac error meter 022 checks the ac voltage to be checked, including:
determining the error of the alternating voltage to be checked according to the standard alternating voltage and the alternating voltage to be checked;
when the error of the alternating voltage to be verified is smaller than or equal to a second preset threshold value, determining that the alternating voltage to be verified passes verification;
when the error of the alternating voltage to be verified is larger than a second preset threshold value, the following operations are executed in a circulating mode until the error of the alternating voltage to be verified is smaller than or equal to the second preset threshold value:
sending an instruction for adjusting the compensation capacitor of the voltage transformer to be verified;
the direct current error measuring instrument 012 is further configured to verify the adjusted direct current voltage to be verified output by the voltage transformer to be verified;
the ac error measuring instrument 022 is further configured to verify the to-be-verified ac voltage output by the adjusted to-be-verified voltage transformer after the to-be-verified dc voltage output by the adjusted to-be-verified voltage transformer passes verification.
In one embodiment, the ac error meter 022 is specifically configured to:
and after the direct current voltage to be verified passes the verification, synchronously acquiring the standard alternating current voltage output by the standard alternating current voltage transformer and the alternating current voltage to be verified output by the voltage transformer to be verified according to the second synchronous trigger instruction.
In specific implementation, as shown in fig. 3, after the dc voltage to be verified passes verification, the ac error measuring instrument 022 may synchronously acquire the standard ac voltage U output by the standard ac voltage transformer 011 according to the synchronous trigger instruction by adjusting the output of the ac voltage source 0230And the alternating current voltage U to be verified output by the voltage transformer to be verified after being analyzed by the digital frame formatXThen, the standard AC voltage U is calculated0And the AC voltage U to be checkedXError X between2Error X2May include U0And UXError of ratio and phase error at error X2When the output voltage is smaller than or equal to a second preset threshold value, the alternating current voltage output by the voltage transformer to be verified meets the requirement, wherein the second preset threshold value can be an alternating current error threshold value, so far, the direct current voltage and the alternating current voltage output by the voltage transformer to be verified meet the requirement, and the verification of the voltage transformer to be verified is completed; at error X2When the voltage is greater than the second preset threshold value, an instruction for adjusting the compensation capacitor of the voltage transformer to be verified is sent, then the dc error measuring instrument 012 verifies the dc voltage to be verified output by the adjusted voltage transformer to be verified, and the ac error measuring instrument 022 verifies the dc voltage to be verified output by the adjusted voltage transformer to be verifiedAfter the voltage verification is passed, verifying the regulated alternating voltage to be verified output by the voltage transformer to be verified, and repeatedly executing the operation until the error X is reached2And when the output voltage is smaller than or equal to the second preset threshold, considering that the output direct current voltage and the output alternating current voltage of the voltage transformer to be verified both meet the requirements, and completing the verification of the voltage transformer to be verified. Therefore, when the alternating voltage check is not in accordance with the requirement, the direct voltage check and the alternating voltage check are repeatedly carried out on the adjusted voltage transformer to be checked, the mutual influence of the adjusted direct voltage and the adjusted alternating voltage is considered, and the check precision of the voltage transformer to be checked is further improved.
Based on the same inventive concept, the embodiment of the invention also provides a method for verifying the voltage transformer for the flexible direct-current power grid, and the method is applied to the system for verifying the voltage transformer for the flexible direct-current power grid, such as the following embodiments. The principle of solving the problems of the voltage transformer calibration method for the flexible direct-current power grid is similar to that of a voltage transformer calibration system for the flexible direct-current power grid, so the implementation of the method can refer to the implementation of the system, and repeated parts are not repeated.
Fig. 4 is a schematic diagram of a flow of a method for verifying a voltage transformer for a flexible dc power grid according to an embodiment of the present invention, and as shown in fig. 4, the method includes:
step 401: the method comprises the following steps that a direct current error measuring instrument collects a standard direct current voltage output by a standard direct current voltage transformer and a direct current voltage to be verified output by a voltage transformer to be verified, wherein the voltage transformer to be verified is a voltage transformer for a flexible direct current power grid;
step 402: the direct current error measuring instrument verifies the direct current voltage to be verified according to the standard direct current voltage;
step 403: after the direct current voltage to be verified passes verification, the alternating current error measuring instrument collects a standard alternating current voltage output by the standard alternating current voltage transformer and an alternating current voltage to be verified output by the voltage transformer to be verified;
step 404: and the alternating current error measuring instrument is used for verifying the alternating current voltage to be verified according to the standard alternating current voltage.
In one embodiment, in step 401, the acquiring, by the dc error measuring instrument, a standard dc voltage output by a standard dc voltage transformer and a dc voltage to be verified output by a voltage transformer to be verified may include:
and according to the first synchronous trigger instruction, synchronously acquiring the standard direct current voltage output by the standard direct current voltage transformer and the direct current voltage to be verified output by the voltage transformer to be verified.
In one embodiment, the step 402 of verifying the dc voltage to be verified according to the standard dc voltage by the dc error measuring apparatus may include:
step 4021: determining the error of the direct current voltage to be verified according to the standard direct current voltage and the direct current voltage to be verified;
step 4022: when the error of the direct current voltage to be verified is smaller than or equal to a first preset threshold value, determining that the direct current voltage to be verified passes verification;
step 4023: when the error of the direct current voltage to be verified is larger than a first preset threshold value, the following operations are executed in a circulating mode until the error of the direct current voltage to be verified is smaller than or equal to the first preset threshold value:
step 4024: sending an instruction for adjusting the compensation capacitor of the voltage transformer to be verified;
step 4025: and checking the regulated direct current voltage to be checked output by the voltage transformer to be checked.
In one embodiment, in step 403, acquiring, by the ac error measuring instrument, the standard ac voltage output by the standard ac voltage transformer and the ac voltage to be verified output by the voltage transformer to be verified after the dc voltage to be verified passes the verification, which may include:
and after the direct current voltage to be verified passes the verification, synchronously acquiring the standard alternating current voltage output by the standard alternating current voltage transformer and the alternating current voltage to be verified output by the voltage transformer to be verified according to the second synchronous trigger instruction.
In one embodiment, the step 404 of verifying the ac voltage to be verified by the ac error measuring device according to the standard ac voltage may include:
step 4041: determining the error of the alternating voltage to be checked according to the standard alternating voltage and the alternating voltage to be checked;
step 4042: when the error of the alternating voltage to be verified is smaller than or equal to a second preset threshold value, determining that the alternating voltage to be verified passes verification;
step 4043: when the error of the alternating voltage to be verified is larger than a second preset threshold value, the following operations are executed in a circulating mode until the error of the alternating voltage to be verified is smaller than or equal to the second preset threshold value:
step 4044: sending an instruction for adjusting the compensation capacitor of the voltage transformer to be verified;
step 4045: the direct current error measuring instrument is used for verifying the direct current voltage to be verified output by the adjusted voltage transformer to be verified;
step 4046: and after the adjusted direct current voltage to be verified output by the voltage transformer to be verified passes verification, the alternating current error measuring instrument verifies the adjusted alternating current voltage to be verified output by the voltage transformer to be verified.
It should be noted that while the operations of the method of the present invention are depicted in the drawings in a particular order, this does not require or imply that the operations must be performed in this particular order, or that all of the illustrated operations must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions.
The embodiment of the invention provides computer equipment which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the processor is used for realizing the voltage transformer checking method for the flexible direct current power grid when executing the computer program.
The embodiment of the invention provides a computer-readable storage medium, wherein a computer program for executing the voltage transformer verification method for the flexible direct current power grid is stored in the computer-readable storage medium.
The following is a specific example to facilitate an understanding of how the invention may be practiced.
Fig. 5 is a schematic diagram of a flow of a specific embodiment in an embodiment of the present invention, as shown in fig. 5, including the following steps:
the first step is as follows: according to the connection mode shown in fig. 2, a voltage transformer to be checked is connected to a dc checking device, and the voltage transformer to be checked is a voltage transformer for a flexible dc power grid, and includes: respectively and electrically connecting the input end of a standard direct current voltage transformer and the input end of a voltage transformer to be verified with the output end of a direct current voltage source, and respectively and electrically connecting the output end of the standard direct current voltage transformer and the output end of the voltage transformer to be verified with a direct current error measuring instrument;
the second step is that: by adjusting the output of the DC voltage source, the DC error measuring instrument synchronously acquires the standard DC voltage U output by the standard DC voltage transformer according to the synchronous trigger instructionRAnd the DC voltage U to be verified output by the voltage transformer to be verifiedMCalculating the standard DC voltage URAnd DC voltage U to be checkedMError X between1Judgment error X1And (3) whether the voltage is smaller than or equal to a first preset threshold value or not, if so, considering that the direct-current voltage output by the voltage transformer to be verified meets the requirement, executing the fifth step, and if not, executing the third step:
the third step: sending an instruction for adjusting the compensation capacitor of the voltage transformer to be verified;
the fourth step: repeatedly executing the operations from the second step to the third step on the adjusted voltage transformer to be verified until the error X is reached1When the voltage is smaller than or equal to the first preset threshold value, the direct current voltage output by the voltage transformer to be verified meets the requirement, and the fifth step is executed;
the fifth step: according to the connection mode shown in fig. 3, the voltage transformer to be verified is connected to the ac verification device, which includes: respectively and electrically connecting the input end of a standard alternating-current voltage transformer and the input end of a voltage transformer to be checked with the output end of an alternating-current voltage source, and respectively and electrically connecting the output end of the standard alternating-current voltage transformer and the output end of the voltage transformer to be checked with an alternating-current error measuring instrument;
and a sixth step: by regulating the output of an AC voltage source, ACThe error measuring instrument synchronously acquires the standard alternating voltage U output by the standard alternating voltage mutual inductor according to the synchronous trigger instruction0And the alternating current voltage U to be checked output by the voltage transformer to be checkedXThen, the standard AC voltage U is calculated0And the AC voltage U to be checkedXError X between2Judgment error X2Whether the output voltage is smaller than or equal to a second preset threshold value or not is judged, if yes, the output direct-current voltage and the output alternating-current voltage of the voltage transformer to be verified both meet requirements, verification is completed, and if not, a seventh step is executed:
the seventh step: sending an instruction for adjusting the compensation capacitor of the voltage transformer to be verified;
eighth step: repeatedly executing the operations from the first step to the seventh step on the adjusted voltage transformer to be verified until the error X is reached2And when the output voltage is less than or equal to the second preset threshold value, considering that the output direct current voltage and the output alternating current voltage of the voltage transformer to be verified both meet the requirements, and completing verification.
In summary, the system and the method for verifying the voltage transformer for the flexible direct current power grid provided by the embodiment of the invention have the following effects:
(1) the direct current error measuring instrument collects a standard direct current voltage output by a standard direct current voltage transformer and a direct current voltage to be verified output by a voltage transformer to be verified, and verifies the direct current voltage to be verified according to the standard direct current voltage; after the direct current voltage to be verified passes verification, the alternating current error measuring instrument collects a standard alternating current voltage output by the standard alternating current voltage transformer and an alternating current voltage to be verified output by the voltage transformer to be verified; according to the standard alternating voltage, the alternating voltage to be verified is verified, the alternating current accuracy of the voltage transformer is considered, the direct current voltage verification and the alternating current voltage verification are carried out on the voltage transformer to be verified, the verification accuracy of the voltage transformer is improved, and the requirement of a flexible direct current power grid on the voltage transformer can be met;
(2) when the alternating voltage check is not in accordance with the requirement, the check steps of the direct voltage check and the alternating voltage check are repeatedly carried out on the adjusted voltage transformer to be checked, the mutual influence of the direct voltage and the alternating voltage is considered, the direct voltage and the alternating voltage can meet the requirement, and the check precision of the voltage transformer to be checked is further improved.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention 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 invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. 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.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The utility model provides a voltage transformer check-up system for flexible direct current electric wire netting which characterized in that includes: direct current verifying attachment and interchange verifying attachment, wherein:
the direct current verifying device comprises: a standard direct current voltage transformer and a direct current error measuring instrument;
the direct current error measuring instrument is used for collecting a standard direct current voltage output by the standard direct current voltage transformer and a direct current voltage to be checked output by the voltage transformer to be checked, wherein the voltage transformer to be checked is a voltage transformer for a flexible direct current power grid; according to the standard direct-current voltage, verifying the direct-current voltage to be verified;
the alternating current verification device comprises: a standard alternating current voltage transformer and an alternating current error measuring instrument;
the alternating current error measuring instrument is used for collecting the standard alternating current voltage output by the standard alternating current voltage transformer and the alternating current voltage to be verified output by the voltage transformer to be verified after the direct current voltage to be verified passes verification; and verifying the alternating voltage to be verified according to the standard alternating voltage.
2. The system of claim 1, wherein the dc error meter verifies the dc voltage to be verified, comprising:
determining the error of the direct current voltage to be verified according to the standard direct current voltage and the direct current voltage to be verified;
when the error of the direct current voltage to be verified is smaller than or equal to a first preset threshold value, determining that the direct current voltage to be verified passes verification;
when the error of the direct current voltage to be verified is larger than a first preset threshold, circularly executing the following operations until the error of the direct current voltage to be verified is smaller than or equal to the first preset threshold:
sending an instruction for adjusting the compensation capacitor of the voltage transformer to be verified;
and checking the regulated direct current voltage to be checked output by the voltage transformer to be checked.
3. The system of claim 2, wherein the ac error meter verifies the ac voltage to be verified, comprising:
determining the error of the alternating voltage to be verified according to the standard alternating voltage and the alternating voltage to be verified;
when the error of the alternating current voltage to be verified is smaller than or equal to a second preset threshold value, determining that the alternating current voltage to be verified passes verification;
when the error of the alternating voltage to be verified is larger than a second preset threshold value, the following operations are executed in a circulating mode until the error of the alternating voltage to be verified is smaller than or equal to the second preset threshold value:
sending an instruction for adjusting the compensation capacitor of the voltage transformer to be verified;
the direct current error measuring instrument is also used for checking the direct current voltage to be checked output by the adjusted voltage transformer to be checked;
the alternating current error measuring instrument is further used for verifying the alternating current voltage to be verified output by the adjusted voltage transformer to be verified after the direct current voltage to be verified output by the adjusted voltage transformer to be verified passes the verification.
4. The system of claim 1, wherein the dc calibration device further comprises: a DC voltage source for outputting a DC voltage;
the output end of the direct current voltage source is electrically connected with the input end of the standard direct current voltage transformer; the output end of the direct current voltage source is electrically connected with the input end of the voltage transformer to be verified;
the alternating current verification device further comprises: an alternating voltage source for outputting an alternating voltage;
the output end of the alternating current voltage source is electrically connected with the input end of the standard alternating current voltage transformer; and the output end of the alternating current voltage source is electrically connected with the input end of the voltage transformer to be verified.
5. The system of claim 1, wherein the dc error meter is specifically configured to:
according to a first synchronous trigger instruction, synchronously acquiring a standard direct current voltage output by the standard direct current voltage transformer and a direct current voltage to be verified output by the voltage transformer to be verified;
the alternating current error measuring instrument is specifically used for synchronously acquiring the standard alternating current voltage output by the standard alternating current voltage transformer and the alternating current voltage to be checked output by the voltage transformer to be checked according to a second synchronous trigger instruction after the direct current voltage to be checked passes the check.
6. A method for verifying a voltage transformer for a flexible direct current power grid is applied to the voltage transformer verification system of any one of claims 1 to 5, and comprises the following steps:
the direct current error measuring instrument is used for collecting a standard direct current voltage output by a standard direct current voltage transformer and a direct current voltage to be checked output by a voltage transformer to be checked, wherein the voltage transformer to be checked is a voltage transformer for a flexible direct current power grid;
the direct current error measuring instrument verifies the direct current voltage to be verified according to the standard direct current voltage;
after the direct current voltage to be verified passes verification, the alternating current error measuring instrument collects a standard alternating current voltage output by the standard alternating current voltage transformer and an alternating current voltage to be verified output by the voltage transformer to be verified;
and the alternating current error measuring instrument is used for verifying the alternating current voltage to be verified according to the standard alternating current voltage.
7. The method of claim 6, wherein the DC error meter verifies the DC voltage to be verified, comprising:
determining the error of the direct current voltage to be verified according to the standard direct current voltage and the direct current voltage to be verified;
when the error of the direct current voltage to be verified is smaller than or equal to a first preset threshold value, determining that the direct current voltage to be verified passes verification;
when the error of the direct current voltage to be verified is larger than a first preset threshold, circularly executing the following operations until the error of the direct current voltage to be verified is smaller than or equal to the first preset threshold:
sending an instruction for adjusting the compensation capacitor of the voltage transformer to be verified;
and checking the regulated direct current voltage to be checked output by the voltage transformer to be checked.
8. The method of claim 7, wherein the ac error meter verifies the ac voltage to be verified, comprising:
determining the error of the alternating voltage to be verified according to the standard alternating voltage and the alternating voltage to be verified;
when the error of the alternating current voltage to be verified is smaller than or equal to a second preset threshold value, determining that the alternating current voltage to be verified passes verification;
when the error of the alternating voltage to be verified is larger than a second preset threshold value, the following operations are executed in a circulating mode until the error of the alternating voltage to be verified is smaller than or equal to the second preset threshold value:
sending an instruction for adjusting the compensation capacitor of the voltage transformer to be verified;
the direct current error measuring instrument is used for verifying the direct current voltage to be verified output by the adjusted voltage transformer to be verified;
and after the adjusted direct current voltage to be verified output by the voltage transformer to be verified passes verification, the alternating current error measuring instrument verifies the adjusted alternating current voltage to be verified output by the voltage transformer to be verified.
9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of any one of claims 6 to 8 when executing the computer program.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for executing the method of any one of claims 6 to 8.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113267743A (en) * | 2021-06-30 | 2021-08-17 | 广东电网有限责任公司 | Method and instrument for checking DC voltage transformer |
| CN113884966A (en) * | 2021-10-27 | 2022-01-04 | 云南电网有限责任公司电力科学研究院 | Alternating current-direct current sensor broadband calibrator and performance detection calibration method thereof |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105203983A (en) * | 2015-10-30 | 2015-12-30 | 江苏省电力公司电力科学研究院 | Flexible alternating current/direct current electronic transformer checking device based on mixed sampling |
| CN205067713U (en) * | 2015-10-30 | 2016-03-02 | 江苏省电力公司电力科学研究院 | Flexible alternating current -direct current electronic transformer calibration equipment based on mix sampling |
| CN205484764U (en) * | 2016-03-30 | 2016-08-17 | 国网电力科学研究院武汉南瑞有限责任公司 | Temporary stable state of alternating current -direct current integration detection device |
| CN206161830U (en) * | 2016-11-18 | 2017-05-10 | 云南电网有限责任公司电力科学研究院 | Synchronous calbiration system of direct current transformer |
| CN206387899U (en) * | 2017-01-05 | 2017-08-08 | 云南电网有限责任公司电力科学研究院 | A kind of DC current transformer frequency response characteristic check system |
| CN206411250U (en) * | 2016-12-14 | 2017-08-15 | 武汉科技大学 | A kind of DC electronic current transformer digitizes real-time calibration equipment |
| CN107390157A (en) * | 2017-06-20 | 2017-11-24 | 中国电力科学研究院 | A kind of apparatus and method for verifying direct current instrument transformer square-wave response |
| CN110441724A (en) * | 2019-07-24 | 2019-11-12 | 国网新疆电力有限公司电力科学研究院 | A kind of device for being verified to DC voltage transformer secondary measuring system |
| CN110488214A (en) * | 2019-09-11 | 2019-11-22 | 国网冀北电力有限公司电力科学研究院 | DC mutual inductor verification instrument and working method |
| CN110780257A (en) * | 2019-12-02 | 2020-02-11 | 国网河北省电力有限公司电力科学研究院 | Direct current transformer detection system and detection method based on standard source |
| CN211180172U (en) * | 2019-08-30 | 2020-08-04 | 北京国电通网络技术有限公司 | Current checking device |
-
2020
- 2020-07-23 CN CN202010716344.8A patent/CN111679239B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105203983A (en) * | 2015-10-30 | 2015-12-30 | 江苏省电力公司电力科学研究院 | Flexible alternating current/direct current electronic transformer checking device based on mixed sampling |
| CN205067713U (en) * | 2015-10-30 | 2016-03-02 | 江苏省电力公司电力科学研究院 | Flexible alternating current -direct current electronic transformer calibration equipment based on mix sampling |
| CN205484764U (en) * | 2016-03-30 | 2016-08-17 | 国网电力科学研究院武汉南瑞有限责任公司 | Temporary stable state of alternating current -direct current integration detection device |
| CN206161830U (en) * | 2016-11-18 | 2017-05-10 | 云南电网有限责任公司电力科学研究院 | Synchronous calbiration system of direct current transformer |
| CN206411250U (en) * | 2016-12-14 | 2017-08-15 | 武汉科技大学 | A kind of DC electronic current transformer digitizes real-time calibration equipment |
| CN206387899U (en) * | 2017-01-05 | 2017-08-08 | 云南电网有限责任公司电力科学研究院 | A kind of DC current transformer frequency response characteristic check system |
| CN107390157A (en) * | 2017-06-20 | 2017-11-24 | 中国电力科学研究院 | A kind of apparatus and method for verifying direct current instrument transformer square-wave response |
| CN110441724A (en) * | 2019-07-24 | 2019-11-12 | 国网新疆电力有限公司电力科学研究院 | A kind of device for being verified to DC voltage transformer secondary measuring system |
| CN211180172U (en) * | 2019-08-30 | 2020-08-04 | 北京国电通网络技术有限公司 | Current checking device |
| CN110488214A (en) * | 2019-09-11 | 2019-11-22 | 国网冀北电力有限公司电力科学研究院 | DC mutual inductor verification instrument and working method |
| CN110780257A (en) * | 2019-12-02 | 2020-02-11 | 国网河北省电力有限公司电力科学研究院 | Direct current transformer detection system and detection method based on standard source |
Non-Patent Citations (1)
| Title |
|---|
| 张杰等: "高压直流互感器现场校验关键技术", 《高电压技术》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113267743A (en) * | 2021-06-30 | 2021-08-17 | 广东电网有限责任公司 | Method and instrument for checking DC voltage transformer |
| CN113884966A (en) * | 2021-10-27 | 2022-01-04 | 云南电网有限责任公司电力科学研究院 | Alternating current-direct current sensor broadband calibrator and performance detection calibration method thereof |
| CN113884966B (en) * | 2021-10-27 | 2023-10-20 | 云南电网有限责任公司电力科学研究院 | AC/DC sensor broadband calibrator and performance detection calibration method thereof |
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|---|---|
| CN111679239B (en) | 2023-05-23 |
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