CN112305484B - Method and device for judging harmonic measurement accuracy of capacitor voltage transformer - Google Patents
Method and device for judging harmonic measurement accuracy of capacitor voltage transformer Download PDFInfo
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- CN112305484B CN112305484B CN202010976617.2A CN202010976617A CN112305484B CN 112305484 B CN112305484 B CN 112305484B CN 202010976617 A CN202010976617 A CN 202010976617A CN 112305484 B CN112305484 B CN 112305484B
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/16—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using capacitive devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The invention is suitable for the technical field of electrical measurement, and provides a method and a device for judging the harmonic measurement accuracy of a capacitor voltage transformer, wherein the method comprises the following steps: acquiring a three-phase of a super-standard harmonic wave of a high-voltage side bus of the transformer measured by a target capacitive voltage transformer, and synchronously acquiring a three-phase of a corresponding harmonic wave of a low-voltage side bus of the transformer measured by an electromagnetic voltage transformer; calculating the three-phase cross-voltage phase difference of the over-standard harmonic from the high-voltage side to the low-voltage side of the transformer and the sequence characteristic of the over-standard harmonic of a bus at the high-voltage side of the transformer; and determining the harmonic measurement accuracy of the target capacitive voltage transformer based on the sequence characteristic of the overproof harmonic of the high-voltage side bus of the transformer and the three-phase voltage-crossing phase difference of the overproof harmonic from the high-voltage side to the low-voltage side of the transformer. According to the method and the device, the harmonic voltage measurement accuracy of the capacitor voltage transformer can be effectively judged, so that the accuracy of judging the harmonic voltage operation condition of the power grid is improved, and unnecessary economic loss is avoided.
Description
Technical Field
The invention belongs to the technical field of electrical measurement, and particularly relates to a method and a device for judging harmonic measurement accuracy of a capacitor voltage transformer.
Background
With the advance of the construction of ultrahigh voltage and intelligent power grids in China, ultrahigh voltage alternating current-direct current transmission and large-scale new energy power generation are developed in a long-term manner, and meanwhile, with the continuous rising of voltage levels of various high-capacity nonlinear loads connected into a power grid, harmonic waves gradually permeate into the high-voltage power grid, so that the problem of the power quality caused by the harmonic waves is not ignored, and an electric power company is prompted to pay more attention to the power quality of the high-voltage power grid; on the other hand, a large number of high-precision and sensitive loads put higher requirements on the power quality of the power grid. The importance of electric energy quality testing is increasingly prominent, and in order to master the electric energy quality operation dynamic of a power grid in real time, a large number of electric energy quality on-line monitoring system construction is developed by power companies in provinces and cities throughout the country, and wide electric energy quality general testing is assisted.
Accurate and reliable power quality measurement is a prerequisite for power quality assessment, diagnosis and treatment. At present, harmonic voltages of high-Voltage substations of 110kV and above are widely measured by a Capacitor Voltage Transformer (CVT), but the clear text in the public power grid standard specifies: the capacitor voltage transformer cannot be used for harmonic measurement, which causes large errors in some harmonic voltage measurement results, but an effective judgment method for CVT harmonic voltage measurement accuracy is lacked at present, which affects final judgment of a power company on the harmonic voltage operation condition of a power grid.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method and an apparatus for determining the accuracy of harmonic measurement of a capacitor voltage transformer, so as to solve the problem in the prior art that the accuracy of harmonic measurement of a capacitor voltage transformer cannot be effectively determined.
The first aspect of the embodiments of the present invention provides a method for determining accuracy of harmonic measurement of a capacitor voltage transformer, including:
acquiring a three-phase of a harmonic wave exceeding the standard of a high-voltage side bus of a transformer measured by a target capacitive voltage transformer as a first three-phase, and synchronously acquiring a three-phase of a harmonic wave corresponding to a low-voltage side bus of the transformer measured by an electromagnetic voltage transformer as a second three-phase;
calculating a three-phase cross-voltage phase difference of the superstandard harmonic from the high-voltage side to the low-voltage side of the transformer according to the first three-phase and the second three-phase;
calculating the phase difference between two phases of the overproof harmonic waves of the high-voltage side bus of the transformer according to the first three-phase; according to the phase difference between the two phases of the over-standard harmonic waves of the high-voltage side bus of the transformer, calculating the sequence characteristic of the over-standard harmonic waves of the high-voltage side bus of the transformer;
and determining the harmonic measurement accuracy of the target capacitive voltage transformer based on the sequence characteristic of the overproof harmonic of the high-voltage side bus of the transformer and the three-phase voltage-crossing phase difference of the overproof harmonic from the high-voltage side to the low-voltage side of the transformer.
A second aspect of the embodiments of the present invention provides a device for determining accuracy of harmonic measurement of a capacitor voltage transformer, including:
a three-phase acquisition module for acquiring a three-phase of the overproof harmonic of the high-voltage side bus of the transformer measured by the target capacitive voltage transformer as a first three-phase, synchronously acquiring a three-phase of a harmonic wave corresponding to a bus at the low-voltage side of the transformer measured by the electromagnetic voltage transformer as a second three-phase;
the cross-voltage phase difference calculation module is used for calculating the three-phase cross-voltage phase difference of the superstandard harmonic from the high-voltage side to the low-voltage side of the transformer according to the first three-phase and the second three-phase;
the sequence characteristic determining module is used for calculating the phase difference between two phases of the over-standard harmonic waves of the high-voltage side bus of the transformer according to the first three-phase; according to the phase difference between the two phases of the over-standard harmonic waves of the high-voltage side bus of the transformer, calculating the sequence characteristic of the over-standard harmonic waves of the high-voltage side bus of the transformer;
and the accuracy judgment module is used for determining the harmonic measurement accuracy of the target capacitive voltage transformer based on the sequence characteristic of the overproof harmonic of the high-voltage side bus of the transformer and the three-phase voltage-spanning phase difference of the overproof harmonic from the high-voltage side to the low-voltage side of the transformer.
A third aspect of the embodiments of the present invention provides a terminal device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the method for determining accuracy of harmonic measurement of a capacitor voltage transformer when executing the computer program.
A fourth aspect of the embodiments of the present invention provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the steps of the method for determining the accuracy of the harmonic measurement of the capacitor voltage transformer are implemented.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: the method comprises the steps of firstly, acquiring a three-phase of a super-standard harmonic wave of a high-voltage side bus of a transformer measured by a target capacitive voltage transformer as a first three-phase, and synchronously acquiring a three-phase of a corresponding harmonic wave of a low-voltage side bus of the transformer measured by an electromagnetic voltage transformer as a second three-phase; then calculating the three-phase cross-voltage phase difference of the superstandard harmonic from the high-voltage side to the low-voltage side of the transformer and the sequence characteristic of the superstandard harmonic of a bus at the high-voltage side of the transformer; and finally, determining the harmonic measurement accuracy of the target capacitor voltage transformer based on the sequence characteristic of the overproof harmonic of the high-voltage side bus of the transformer and the three-phase voltage-crossing phase difference of the overproof harmonic from the high-voltage side to the low-voltage side of the transformer. According to the embodiment, the harmonic voltage measurement accuracy of the capacitor voltage transformer can be effectively judged through the scheme, so that the accuracy of judging the harmonic voltage operation condition of the power grid is improved, and unnecessary economic loss is avoided.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a method for determining accuracy of harmonic measurement of a capacitive voltage transformer according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the device connections for the harmonic voltage measurement process provided by the embodiment of the present invention;
FIG. 3 is a schematic diagram of a high side harmonic voltage three phase and a low side harmonic voltage three phase provided by an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a device for judging the accuracy of measuring the harmonic wave of the capacitive voltage transformer according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a terminal device according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
In an embodiment, as shown in fig. 1, fig. 1 shows a method for determining accuracy of harmonic measurement of a capacitive voltage transformer provided by this embodiment, and a process thereof is detailed as follows:
s101: acquiring a three-phase of a super-standard harmonic wave of a high-voltage side bus of a transformer measured by a target capacitive voltage transformer as a first three-phase, and synchronously acquiring a three-phase of a corresponding harmonic wave of a low-voltage side bus of the transformer measured by an electromagnetic voltage transformer as a second three-phase;
s102: calculating a three-phase cross-voltage phase difference of the superstandard harmonic from the high-voltage side to the low-voltage side of the transformer according to the first three-phase and the second three-phase;
s103: calculating the phase difference between two phases of the overproof harmonic waves of the high-voltage side bus of the transformer according to the first three-phase; calculating the sequence characteristic of the exceeding harmonic of the high-voltage side bus of the transformer according to the phase difference between the two phases of the exceeding harmonic of the high-voltage side bus of the transformer;
s104: and determining the harmonic measurement accuracy of the target capacitive voltage transformer based on the sequence characteristic of the overproof harmonic of the high-voltage side bus of the transformer and the three-phase voltage-crossing phase difference of the overproof harmonic from the high-voltage side to the low-voltage side of the transformer.
The discrimination method provided by the invention is suitable for the transformer substation with the capacitor voltage transformer measuring the harmonic voltage of the high-voltage power grid exceeding the standard. Specifically, when the harmonic voltage of the high-voltage side bus of the transformer is measured by the target capacitive voltage transformer to exceed the standard, the harmonic measurement accuracy determination process S101-S104 provided by this embodiment is performed.
The main flow body of the embodiment is a terminal device, the terminal device is connected with an electric energy quality analyzer, and the electric energy quality analyzer is respectively connected with a target capacitor voltage transformer and an electromagnetic voltage transformer.
Specifically, the harmonic corresponding to the low-voltage side bus of the transformer according to the embodiment is a low-voltage side corresponding subharmonic of the overproof harmonic of the high-voltage side of the transformer.
Specifically, as shown in fig. 2, fig. 2 shows a device connection diagram of the harmonic voltage measurement process. In the present embodiment, power quality analysis is usedThe instrument M1 carries out synchronous test on the h-order harmonic voltage which exceeds the standard, and the A-phase theta of the h-order harmonic voltage of the high-voltage side bus of the transformer T is obtained through the measurement of the capacitor voltage transformer CVT H,A (h) Phase of B phase theta H,B (h) And phase C θ H,C (h) Measuring the phase theta of the phase A of the h harmonic voltage of the low-voltage side bus by an electromagnetic voltage transformer PT L,A (h) Phase B, phase theta L,B (h) And phase C θ L,C (h) In that respect The electric energy quality analyzer M1 collects a three-phase of h-order super-standard harmonic wave on the high-voltage side of the transformer measured by the capacitor voltage transformer and a three-phase of h-order harmonic wave on the low-voltage side of the transformer measured by the electromagnetic voltage transformer PT, and sends the three-phase of the h-order super-standard harmonic wave on the high-voltage side of the transformer measured by the capacitor voltage transformer CVT and the three-phase of the h-order harmonic wave on the low-voltage side of the transformer measured by the electromagnetic voltage transformer PT to the terminal equipment so that the terminal equipment can judge the accuracy of the harmonic wave measurement of the capacitor voltage transformer.
As can be seen from the foregoing embodiments, in this embodiment, first, a three-phase of a harmonic wave exceeding a high-voltage side bus of a transformer, which is measured by a target capacitive voltage transformer, is obtained as a first three-phase, and a three-phase of a harmonic wave corresponding to a low-voltage side bus of the transformer, which is measured by an electromagnetic voltage transformer, is synchronously obtained as a second three-phase; then calculating the three-phase cross-voltage phase difference of the superstandard harmonic from the high-voltage side to the low-voltage side of the transformer and the sequence characteristic of the superstandard harmonic of a bus at the high-voltage side of the transformer; and finally, determining the harmonic measurement accuracy of the target capacitor voltage transformer based on the sequence characteristic of the overproof harmonic of the high-voltage side bus of the transformer and the three-phase voltage-crossing phase difference of the overproof harmonic from the high-voltage side to the low-voltage side of the transformer. According to the embodiment, the harmonic voltage measurement accuracy of the capacitor voltage transformer can be effectively judged through the scheme, so that the accuracy of judging the harmonic voltage operation condition of the power grid is improved, and unnecessary economic loss is avoided.
In one embodiment, the specific implementation flow of S102 in fig. 1 includes:
and (3) calculating:
obtaining a three-phase cross-voltage phase difference of the superstandard harmonic from a high-voltage side to a low-voltage side;
in the formula (1), the reaction mixture is,
the A phase cross-voltage phase difference of the h-order over-standard harmonic from the high-voltage side to the low-voltage side of the transformer is shown,
representing the phase B cross-over voltage phase difference of the h-order superscalar harmonic from the high-voltage side to the low-voltage side of the transformer,
represents the C-phase cross-voltage phase difference theta of h-order superstandard harmonic from the high-voltage side to the low-voltage side of the transformer H,A (h) The phase A, theta, of the h-order overproof harmonic wave of the high-voltage side bus of the transformer measured by the target capacitive voltage transformer is represented L,A (h) The phase A, theta of h-order harmonic of a low-voltage side bus of the transformer measured by the electromagnetic voltage transformer H,B (h) The phase B, theta, of the h-order overproof harmonic wave of the high-voltage side bus of the transformer measured by the target capacitive voltage transformer is represented L,B (h) The phase B, theta, of h-order harmonic of a bus at the low voltage side of the transformer measured by the electromagnetic voltage transformer H,C (h) The C phase theta of the h-order overproof harmonic wave of the high-voltage side bus of the transformer measured by the target capacitor voltage transformer is represented L,C (h) And the phase C of the h-th harmonic of the low-voltage side bus of the transformer measured by the electromagnetic voltage transformer is represented.
In the present embodiment, the h-th harmonic voltage content rate should maintain a certain stability during the measurement period, i.e. the variation trend approaches to the horizontal state. The measurement period may be set to a period greater than 5 minutes.
In an embodiment, the specific implementation flow of S103 in fig. 1 further includes:
s201: if the phase difference between the two phases of the over-standard harmonic wave of the high-voltage side bus of the transformer meets a first phase difference condition, the over-standard harmonic wave of the high-voltage side bus of the transformer is in a positive sequence characteristic;
s202: if the phase difference between the two phases of the overproof harmonic wave of the high-voltage side bus of the transformer meets a second phase difference condition, the overproof harmonic wave of the high-voltage side bus of the transformer is in a negative sequence characteristic;
s203: if the phase difference between the two phases of the overproof harmonic of the high-voltage side bus of the transformer meets a third phase difference condition, the overproof harmonic of the high-voltage side bus of the transformer is in a zero-sequence characteristic;
wherein the first phase difference condition is
The second phase difference condition is as follows:
the third phase difference condition is as follows:
in the formulae (2) to (4), θ H,A (h) The phase A, theta, of the h-order overproof harmonic wave of the high-voltage side bus of the transformer measured by the target capacitive voltage transformer is represented H,B (h) Representing the phase B, theta, of the h-order overproof harmonic wave of the high-voltage side bus of the transformer measured by the target capacitive voltage transformer H,C (h) And the phase C of the h-order overproof harmonic wave of the high-voltage side bus of the transformer measured by the target capacitance voltage transformer is represented, and the delta mu represents the harmonic phase measurement precision of an A-level instrument.
In a three-phase power system, there are 3 sequence characteristics of electrical signals, namely positive, negative and zero sequence. The sequence characteristic can be judged according to the phase difference between every two of A, B, C three-phase phases of the h-th harmonic voltage on the high-voltage side of the transformer.
In the present embodiment, Δ μ ≦ 1 ° × h when h ≦ 5, and Δ μ ≦ 5 ° when h > 5.
In one embodiment, the specific implementation flow of S104 in fig. 1 includes:
s301: acquiring a connection group of the transformer;
s302: and determining the harmonic measurement accuracy of the target capacitive voltage transformer based on the sequence characteristic of the overproof harmonic of the high-voltage side bus of the transformer and the three-phase voltage-crossing phase difference of the overproof harmonic from the high-voltage side to the low-voltage side of the transformer under the condition that the connection group of the transformer meets the preset connection group condition.
In this embodiment, transformer connection group information in the high-voltage substation is acquired through an equipment nameplate or other effective ways, and it is confirmed that the transformer connection group of the high-voltage substation should meet the following requirements:
(1) The connection group of the three-winding transformer is YN, YN0 and d11;
(2) The connection group of the two-winding transformer is YN and d11.
Because the electric energy quality analyzer M1 performs harmonic voltage measurement through the voltage transformer, it is also required to ensure that the connection groups corresponding to the three-phase voltage transformer measurement winding of the high-voltage side bus and the three-phase voltage transformer measurement winding of the low-voltage side bus of the transformer are the same, and are generally YN, YN0 or YN, and d0.
In an embodiment, the specific implementation flow of S104 in fig. 1 further includes:
s401: if the bus of the high-voltage side of the transformer is in a positive sequence characteristic and the phase difference of three phases of the exceeding harmonic from the high-voltage side to the low-voltage side of the transformer falls into a first preset interval, judging that the target capacitive voltage transformer has an error in the harmonic measurement of the high-voltage side of the transformer;
s402: or if the bus of the high-voltage side of the transformer is in a negative sequence characteristic and the phase difference of the three phases of the exceeding harmonic from the high-voltage side to the low-voltage side of the transformer falls into a second preset interval, judging that the target capacitive voltage transformer has an error in the harmonic measurement of the high-voltage side of the transformer.
Specifically, under the condition that the connection group of the high-voltage substation transformer and the voltage transformer is met, the following voltage-crossing phase difference interval is selected according to the order characteristic of the overproof h-order harmonic voltage, so as to judge whether the overproof harmonic voltage measured by the target capacitor voltage transformer is accurate. The process of the step specifically comprises the following steps:
(1) When the over-standard h-order harmonic voltage is positive-order, an
In the interval (150-delta mu max ，180°)∪[-180°，-30°-Δμ max ) In, i.e.
And
are all (150-delta mu) max ，180°)∪[-180°，-30°-Δμ max ) And if so, judging that the overproof h-order harmonic voltage measured by the target capacitor voltage transformer has a larger error, otherwise, determining that the overproof h-order harmonic voltage cannot be determined. When h is generated>At 5, Δ μ max ＝5。
(2) When the h-order harmonic voltage exceeds the standard is in negative sequence, and
in the interval (-150 to delta mu) max ，30°-Δμ max ) And if so, judging that the overproof h-order harmonic voltage measured by the target capacitor voltage transformer has a larger error, otherwise, determining that the overproof h-order harmonic voltage cannot be determined.
(3) When the overproof h-order harmonic voltage is zero-order,
meaningless and uncertain.
In one embodiment, the first predetermined interval is ((150 ° - Δ μ @) max ，180°)∪[-180°，-30°-Δμ max ) The second preset interval is (-150 degrees to delta mu) max ，30°-Δμ max ) (ii) a Wherein, Δ μ max Represents the maximum error allowed by the harmonic phase measurement of the class a instrument.
The above process is described in detail with reference to specific examples, and the numerical values used in this example are only examples, and the user may make corresponding changes according to actual needs.
In this example, a 220kV substation has a three-winding transformer with connection groups of YN, YN0, and d11, and its 220kV high-voltage side bus voltage transformer is an YN, YN0 connected capacitor voltage transformer, and its 10kV low-voltage side bus voltage transformer is an YN, and d0 connected electromagnetic voltage transformer.
The probability value of 95% of the content of the 5 th harmonic voltage of the 220kV bus obtained by measurement of the target capacitive voltage transformer reaches 3.46% and exceeds the limit requirement, so that the three-phase at the high and low voltage sides of the 5 th harmonic exceeding time period is synchronously measured by using the electric energy quality analyzer M1, and the phase vector diagram of the 5 th harmonic voltage synchronously measured at the high and low voltage sides of the transformer is shown in FIG. 3.
As can be seen from fig. 3, the phase of the transformer at the high voltage 220kV side is: theta H,A (5)＝78.5°、θ H,B (5)＝-162.1°、θ H,C (5) Phase of 10kV side of low voltage of a = 43.7 transformer: theta L,A (5)＝63.7°、θ L,B (5)＝-178.6°、θ L,C (5) = -59.5. The phase difference between the two three-phase phases A, B, C of the 5 th harmonic voltage with the high-voltage side exceeding is shown by the formula (5):
from the above equation (5), the measured 5 th harmonic exhibits a negative sequence characteristic.
At this time, the voltage-crossing phase difference of the corresponding phase from the high-voltage side to the low-voltage side is calculated, and the result is shown in formula (6):
from the formula (6)
According to the judgment interval of the cross-voltage phase difference of the negative sequence harmonic, the situation that the voltage of the over-standard harmonic measured by the target capacitor voltage transformer has a large error and the over-standard conclusion is not credible can be judged.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
In an embodiment, as shown in fig. 4, fig. 4 shows a structure of a capacitive voltage transformer harmonic measurement accuracy determination apparatus 100 provided by the present embodiment, which includes:
the three-phase acquisition module 110 is configured to acquire a three-phase of a harmonic wave exceeding a standard of a high-voltage side bus of the transformer, which is measured by the target capacitive voltage transformer, as a first three-phase, and synchronously acquire a three-phase of a harmonic wave corresponding to a low-voltage side bus of the transformer, which is measured by the electromagnetic voltage transformer, as a second three-phase;
a cross-voltage phase difference calculating module 120, configured to calculate a three-phase cross-voltage phase difference between the overproof harmonic from the high-voltage side to the low-voltage side of the transformer according to the first three-phase and the second three-phase;
the sequence characteristic determining module 130 is configured to calculate a phase difference between two phases of the harmonic wave with the standard-exceeding bus of the high-voltage side of the transformer according to the first three-phase; calculating the sequence characteristic of the exceeding harmonic of the high-voltage side bus of the transformer according to the phase difference between the two phases of the exceeding harmonic of the high-voltage side bus of the transformer;
and the accuracy judging module 140 is configured to determine the harmonic measurement accuracy of the target capacitive voltage transformer based on a sequence characteristic of the exceeding harmonic of the high-voltage side bus of the transformer and a three-phase voltage-crossing phase difference between the exceeding harmonic and the low-voltage side of the transformer.
In one embodiment, the cross-voltage phase difference calculation module 120 includes:
and (3) calculating:
obtaining a three-phase cross-voltage phase difference of the superstandard harmonic from a high-voltage side to a low-voltage side;
wherein the content of the first and second substances,
the A phase cross-voltage phase difference of the h-order over-standard harmonic from the high-voltage side to the low-voltage side of the transformer is shown,
representing the phase B cross-over voltage phase difference of the h-order superscalar harmonic from the high-voltage side to the low-voltage side of the transformer,
represents the C-phase cross-voltage phase difference theta of h-order superstandard harmonic from the high-voltage side to the low-voltage side of the transformer H,A (h) The phase A, theta, of the h-order overproof harmonic wave of the high-voltage side bus of the transformer measured by the target capacitive voltage transformer is represented L,A (h) The phase A, theta of h-order harmonic of a low-voltage side bus of the transformer measured by the electromagnetic voltage transformer H,B (h) The phase B, theta, of the h-order overproof harmonic wave of the high-voltage side bus of the transformer measured by the target capacitive voltage transformer is represented L,B (h) The phase B, theta, of h-order harmonic of a bus at the low-voltage side of the transformer measured by the electromagnetic voltage transformer is represented H,C (h) The C phase theta of the h-order overproof harmonic wave of the high-voltage side bus of the transformer measured by the target capacitor voltage transformer is represented L,C (h) And the phase C of the h-th harmonic of the low-voltage side bus of the transformer measured by the electromagnetic voltage transformer is represented.
In one embodiment, the order property determination module 130 includes:
the positive sequence characteristic judging unit is used for judging whether the over-standard harmonic wave of the high-voltage side bus of the transformer is in a positive sequence characteristic if the phase difference between two phases of the over-standard harmonic wave of the high-voltage side bus of the transformer meets a first phase difference condition;
the negative sequence characteristic judging unit is used for judging whether the over-standard harmonic wave of the high-voltage side bus of the transformer is in a negative sequence characteristic if the phase difference between the two phases of the over-standard harmonic wave of the high-voltage side bus of the transformer meets a second phase difference condition;
the zero sequence characteristic determination unit is used for determining that the over-standard harmonic wave of the high-voltage side bus of the transformer is in a zero sequence characteristic if the phase difference between two phases of the over-standard harmonic wave of the high-voltage side bus of the transformer meets a third phase difference condition;
wherein the first phase difference condition is:
the second phase difference condition is as follows:
the third phase difference condition is as follows:
wherein, theta H,A (h) The phase A, theta, of the h-order overproof harmonic wave of the high-voltage side bus of the transformer measured by the target capacitive voltage transformer is represented H,B (h) The phase B, theta, of the h-order overproof harmonic wave of the high-voltage side bus of the transformer measured by the target capacitive voltage transformer is represented H,C (h) And the phase C of the h-order overproof harmonic wave of the high-voltage side bus of the transformer measured by the target capacitance voltage transformer is represented, and the delta mu represents the harmonic phase measurement precision of an A-level instrument.
In one embodiment, the accuracy determination module 140 includes:
the connection group acquisition unit is used for acquiring the connection group of the transformer;
and the accuracy judging unit is used for determining the harmonic measurement accuracy of the target capacitive voltage transformer based on the sequence characteristic of the overproof harmonic of the high-voltage side bus of the transformer and the three-phase voltage-spanning phase difference of the overproof harmonic from the high-voltage side to the low-voltage side of the transformer under the condition that the connection group of the transformer meets the preset connection group condition.
In one embodiment, the accuracy determining module 140 may further include:
the first error judgment unit is used for judging that the target capacitive voltage transformer has an error in harmonic measurement on the high-voltage side of the transformer if the overproof harmonic of the high-voltage side bus of the transformer is in a positive sequence characteristic and the phase difference of three phases of the overproof harmonic from the high-voltage side to the low-voltage side of the transformer falls into a first preset interval;
or the second error judging unit is used for judging that the target capacitive voltage transformer has an error in the harmonic measurement of the high-voltage side of the transformer if the overproof harmonic of the high-voltage side of the transformer is in a negative sequence characteristic and the three-phase voltage-spanning phase difference of the overproof harmonic from the high-voltage side to the low-voltage side of the transformer falls into a second preset interval.
In one embodiment, the first predetermined interval is ((150 ° - Δ μ [ ], μ ]) max ，180°)∪[-180°，-30°-Δμ max ) The second preset interval is (-150-delta mu) max ，30°-Δμ max ) (ii) a Wherein, is max Represents the maximum error allowed by the harmonic phase measurement of the class a instrument.
Fig. 5 is a schematic diagram of a terminal device according to an embodiment of the present invention. As shown in fig. 5, the terminal device 5 of this embodiment includes: a processor 50, a memory 51 and a computer program 52 stored in said memory 51 and executable on said processor 50. The processor 50, when executing the computer program 52, implements the steps in the above-mentioned method for determining the accuracy of harmonic measurement of the capacitive voltage transformer, for example, S101 to S104 shown in fig. 1. Alternatively, the processor 50, when executing the computer program 52, implements the functions of each module/unit in the above-mentioned device embodiments, such as the functions of the modules 110 to 140 shown in fig. 4.
The computer program 52 may be divided into one or more modules/units, which are stored in the memory 51 and executed by the processor 50 to accomplish the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution process of the computer program 52 in the terminal device 5.
The terminal device 5 may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The terminal device may include, but is not limited to, a processor 50, a memory 51. Those skilled in the art will appreciate that fig. 5 is merely an example of a terminal device 5 and does not constitute a limitation of terminal device 5 and may include more or fewer components than shown, or some components may be combined, or different components, e.g., the terminal device may also include input-output devices, network access devices, buses, etc.
The Processor 50 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 51 may be an internal storage unit of the terminal device 5, such as a hard disk or a memory of the terminal device 5. The memory 51 may also be an external storage device of the terminal device 5, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, which are provided on the terminal device 5. Further, the memory 51 may also include both an internal storage unit and an external storage device of the terminal device 5. The memory 51 is used for storing the computer programs and other programs and data required by the terminal device. The memory 51 may also be used to temporarily store data that has been output or is to be output.
It should be clear to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional units and modules is only used for illustration, and in practical applications, the above function distribution may be performed by different functional units and modules as needed, that is, the internal structure of the apparatus may be divided into different functional units or modules to perform all or part of the above described functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other ways. For example, the above-described embodiments of the apparatus/terminal device are merely illustrative, and for example, the division of the modules or units is only one type of logical function division, and other division manners may be available in actual implementation, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. . Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, read-Only Memory (ROM), random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer-readable medium may contain suitable additions or subtractions depending on the requirements of legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer-readable media may not include electrical carrier signals or telecommunication signals in accordance with legislation and patent practice.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (8)
1. A method for judging harmonic measurement accuracy of a capacitor voltage transformer is characterized by comprising the following steps:
acquiring a three-phase of a harmonic wave exceeding the standard of a high-voltage side bus of a transformer measured by a target capacitive voltage transformer as a first three-phase, and synchronously acquiring a three-phase of a harmonic wave corresponding to a low-voltage side bus of the transformer measured by an electromagnetic voltage transformer as a second three-phase; calculating a three-phase cross-voltage phase difference of the superstandard harmonic from the high-voltage side to the low-voltage side of the transformer according to the first three-phase and the second three-phase; according to the first three-phase, calculating the phase difference between two phases of the overproof harmonic waves of the high-voltage side bus of the transformer; calculating the sequence characteristic of the exceeding harmonic of the high-voltage side bus of the transformer according to the phase difference between the two phases of the exceeding harmonic of the high-voltage side bus of the transformer; determining the harmonic measurement accuracy of the target capacitive voltage transformer based on the sequence characteristic of the overproof harmonic of the high-voltage side bus of the transformer and the three-phase voltage-crossing phase difference of the overproof harmonic from the high-voltage side to the low-voltage side of the transformer;
the method for determining the harmonic measurement accuracy of the target capacitive voltage transformer based on the sequence characteristic of the overproof harmonic of the high-voltage side bus of the transformer and the three-phase cross-voltage phase difference of the overproof harmonic from the high-voltage side to the low-voltage side of the transformer comprises the following steps:
if the high-voltage side bus of the transformerThe out-of-standard harmonic wave is in positive sequence characteristic, and the three-phase voltage-crossing phase difference of the out-of-standard harmonic wave from the high-voltage side to the low-voltage side of the transformer falls into a first preset interval ((150-delta mu) max ，180°)∪[-180°，-30°-Δμ max ) And if so, judging that the target capacitor voltage transformer has an error in the harmonic measurement of the high-voltage side of the transformer, wherein the error is delta mu max Representing the maximum error allowed by harmonic phase measurement of an A-level instrument;
or if the overproof harmonic of the high-voltage side bus of the transformer is in a negative sequence characteristic, and the three-phase cross-voltage phase difference of the overproof harmonic from the high-voltage side to the low-voltage side of the transformer falls into a second preset interval (-150-delta mu) max ，30°-Δμ max ) And if so, judging that the target capacitor voltage transformer has an error in the harmonic measurement of the high-voltage side of the transformer.
2. The method for judging the harmonic measurement accuracy of the capacitor voltage transformer according to claim 1, wherein the calculating the three-phase voltage-crossing phase difference of the superstandard harmonic from the high-voltage side to the low-voltage side of the transformer according to the first three-phase and the second three-phase comprises:
and (3) calculating:
obtaining a three-phase cross-voltage phase difference of the superstandard harmonic from a high-voltage side to a low-voltage side;
wherein the content of the first and second substances,
the phase A cross-voltage phase difference of h-order superscalar harmonic waves from the high-voltage side to the low-voltage side of the transformer is shown,
represents the B phase cross-over voltage phase difference of h-order superscalar harmonic from the high-voltage side to the low-voltage side of the transformer,
representing h-order superscalar harmonicsC-phase cross-voltage phase difference from high-voltage side to low-voltage side of transformer, theta H,A (h) The phase A, theta, of the h-order overproof harmonic wave of the high-voltage side bus of the transformer measured by the target capacitive voltage transformer is represented L,A (h) The phase A, theta of h-order harmonic of a low-voltage side bus of the transformer measured by the electromagnetic voltage transformer H,B (h) The phase B, theta, of the h-order overproof harmonic wave of the high-voltage side bus of the transformer measured by the target capacitive voltage transformer is represented L,B (h) The phase B, theta, of h-order harmonic of a bus at the low voltage side of the transformer measured by the electromagnetic voltage transformer H,C (h) The C phase, theta, of the h-order overproof harmonic wave of the high-voltage side bus of the transformer measured by the target capacitive voltage transformer is represented L,C (h) And the phase C of the h-th harmonic of the low-voltage side bus of the transformer measured by the electromagnetic voltage transformer is represented.
3. The method for judging the accuracy of the harmonic measurement of the capacitor voltage transformer according to claim 1, wherein the step of calculating the sequence characteristic of the exceeding harmonic of the high-voltage side bus of the transformer according to the phase difference between two phases of the exceeding harmonic of the high-voltage side bus of the transformer comprises the following steps:
if the phase difference between the two phases of the overproof harmonic wave of the high-voltage side bus of the transformer meets a first phase difference condition, the overproof harmonic wave of the high-voltage side bus of the transformer is in a positive sequence characteristic;
if the phase difference between the two phases of the overproof harmonic wave of the high-voltage side bus of the transformer meets a second phase difference condition, the overproof harmonic wave of the high-voltage side bus of the transformer is in a negative sequence characteristic;
if the phase difference between the two phases of the overproof harmonic of the high-voltage side bus of the transformer meets a third phase difference condition, the overproof harmonic of the high-voltage side bus of the transformer is in a zero-sequence characteristic;
wherein the first phase difference condition is:
the second phase difference condition is as follows:
the third phase difference condition is as follows:
wherein, theta H,A (h) The phase A, theta, of the h-order overproof harmonic wave of the high-voltage side bus of the transformer measured by the target capacitive voltage transformer is represented H,B (h) The phase B, theta, of the h-order overproof harmonic wave of the high-voltage side bus of the transformer measured by the target capacitive voltage transformer is represented H,C (h) And the phase C of the h-order overproof harmonic wave of the high-voltage side bus of the transformer measured by the target capacitor voltage transformer is represented, and the delta mu represents the harmonic phase measurement precision of an A-level instrument.
4. The method for judging the harmonic measurement accuracy of the capacitor voltage transformer according to claim 1, wherein the determining the harmonic measurement accuracy of the target capacitor voltage transformer based on the sequence characteristics of the bus over-standard harmonics on the high voltage side of the transformer and the three-phase voltage-crossing phase difference of the over-standard harmonics from the high voltage side to the low voltage side of the transformer comprises:
acquiring a connection group of the transformer;
and determining the harmonic measurement accuracy of the target capacitive voltage transformer based on the sequence characteristic of the overproof harmonic of the high-voltage side bus of the transformer and the three-phase voltage-crossing phase difference of the overproof harmonic from the high-voltage side to the low-voltage side of the transformer under the condition that the connection group of the transformer meets the preset connection group condition.
5. The utility model provides a capacitive voltage transformer harmonic measures accuracy discriminating gear which characterized in that includes:
a three-phase acquisition module for acquiring a three-phase of the overproof harmonic of the high-voltage side bus of the transformer measured by the target capacitive voltage transformer as a first three-phase, synchronously acquiring a three-phase of a harmonic wave corresponding to a bus at the low-voltage side of the transformer measured by the electromagnetic voltage transformer as a second three-phase;
the cross-voltage phase difference calculation module is used for calculating the three-phase cross-voltage phase difference of the superstandard harmonic from the high-voltage side to the low-voltage side of the transformer according to the first three-phase and the second three-phase;
the sequence characteristic determining module is used for calculating the phase difference between two phases of the superstandard harmonic waves of the high-voltage side bus of the transformer according to the first three-phase; calculating the sequence characteristic of the exceeding harmonic of the high-voltage side bus of the transformer according to the phase difference between the two phases of the exceeding harmonic of the high-voltage side bus of the transformer;
the accuracy judgment module is used for determining the harmonic measurement accuracy of the target capacitive voltage transformer based on the sequence characteristic of the overproof harmonic of the high-voltage side bus of the transformer and the three-phase voltage-spanning phase difference of the overproof harmonic from the high-voltage side to the low-voltage side of the transformer;
wherein, the accuracy judging module comprises:
a first error discrimination unit, configured to determine that the superstandard harmonic of the high-voltage side of the transformer is in a positive sequence characteristic and that a voltage difference between three phases of the superstandard harmonic from the high-voltage side to the low-voltage side of the transformer falls within a first preset interval ((150 ° - Δ μ ″) max ，180°)∪[-180°，-30°-Δμ max ) And if so, judging that the target capacitor voltage transformer has an error in the harmonic measurement of the high-voltage side of the transformer, wherein the error is delta mu max Representing the maximum error allowed by harmonic phase measurement of an A-level instrument;
or the second error discrimination unit is used for judging whether the overproof harmonic of the high-voltage side bus of the transformer is in a negative sequence characteristic or not and whether the three-phase cross-voltage phase difference of the overproof harmonic from the high-voltage side to the low-voltage side of the transformer falls into a second preset interval (-150-delta mu) max ，30°-Δμ max ) And if so, judging that the target capacitor voltage transformer has an error in the harmonic measurement of the high-voltage side of the transformer.
6. The apparatus for determining harmonic measurement accuracy of a capacitor voltage transformer according to claim 5, wherein the voltage-spanning phase difference calculating module comprises:
and (3) calculating:
obtaining a three-phase cross-voltage phase difference of the superstandard harmonic from a high-voltage side to a low-voltage side;
wherein the content of the first and second substances,
the phase A cross-voltage phase difference of h-order superscalar harmonic waves from the high-voltage side to the low-voltage side of the transformer is shown,
representing the phase B cross-over voltage phase difference of the h-order superscalar harmonic from the high-voltage side to the low-voltage side of the transformer,
represents the C-phase cross-voltage phase difference theta of h-order superstandard harmonic from the high-voltage side to the low-voltage side of the transformer H,A (h) The phase A, theta, of the h-order overproof harmonic wave of the high-voltage side bus of the transformer measured by the target capacitive voltage transformer is represented L,A (h) The phase A, theta of h-order harmonic of a low-voltage side bus of the transformer measured by the electromagnetic voltage transformer H,B (h) The phase B, theta, of the h-order overproof harmonic wave of the high-voltage side bus of the transformer measured by the target capacitive voltage transformer is represented L,B (h) The phase B, theta, of h-order harmonic of a bus at the low-voltage side of the transformer measured by the electromagnetic voltage transformer is represented H,C (h) The C phase theta of the h-order overproof harmonic wave of the high-voltage side bus of the transformer measured by the target capacitor voltage transformer is represented L,C (h) And the phase C of the h-th harmonic of the low-voltage side bus of the transformer measured by the electromagnetic voltage transformer is represented.
7. A terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of claims 1 to 4 when executing the computer program.
8. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 4.
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