CN113702893A - Method and device for evaluating transient waveform transmission consistency of direct current transformer - Google Patents
Method and device for evaluating transient waveform transmission consistency of direct current transformer Download PDFInfo
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Abstract
The application discloses a method and a device for evaluating transient waveform transmission consistency of a direct current transformer, comprising the following steps of: acquiring a standard transient signal applied to the direct current transformer by a step voltage current source or a transient step signal source; applying the standard transient step signal to the primary side of the direct current transformer, and collecting a sampling value output by a merging unit of the tested direct current transformer to obtain a first sampling value; performing discrete interpolation calculation according to the first sampling value to obtain a first transient step signal; calculating to obtain a first envelope region according to the standard transient signal; calculating to obtain a second envelope area according to the first transient step signal; calculating the difference value of the first envelope region and the second envelope region to obtain a signal difference value; and calculating the signal difference between the signal difference and the first envelope area, wherein the transient characteristics of the direct current transformer can be comprehensively reflected by adopting the signal difference without a large amount of data processing, and the time is saved.
Description
Technical Field
The invention relates to the technical field of electric power systems and automation thereof, in particular to a method and a device for evaluating transient waveform transmission consistency of a direct current transformer.
Background
With the continuous progress of alternating current transmission and direct current transmission technologies, the voltage level is higher and higher, the scale is larger and larger, most countries adopt a modern power grid pattern of alternating current and direct current power grids, the alternating current transmission technology and the direct current transmission technology are synchronously developed all the time, and the two corresponding technologies realize the situation of deep fusion and supplement in engineering.
The direct current transformer is an important device of a direct current transmission system, and a type test, a delivery test, a handover test and a period detection of the direct current transformer used in the system before installation are indispensable works for ensuring the safe operation of the direct current transmission system. The whole signal transmission of the direct current transformer relates to a plurality of links and provides important current and voltage signals for measurement and control and protection of a direct current system, and whether the steady state transmission accuracy, the frequency response and the transient response characteristic of the direct current transformer signals meet the requirements or not is the key point of safe operation of the direct current transmission system.
At present, technicians have certain researches on steady-state accuracy and frequency response tests of the direct current transformer, and provide and apply a field calibration method with good effect. However, it is difficult to operate the transient characteristic test of the dc transformer all the time, and meanwhile, the output sampling frequency of the dc transformer is inconsistent, so how to evaluate the transient performance of the dc transformer is a difficult problem to be solved all the time. If the advantages of the transient characteristics of the direct current transformer are measured only from the indexes of delay time and step rise time, the advantages are obvious and incomplete, generally, after a direct current transmission system breaks down, the voltage and current waveforms of the direct current transformer cover transient components and the like, and signals superposed together show more complexity than ideal signals. In fact, for the transient characteristic test of the direct current transformer, the transmission capability of the direct current transformer to complex waveforms is examined, and a technical application to standard transient signals and waveforms of output signals of the tested transformer is also provided.
Disclosure of Invention
The invention provides a method and a device for evaluating transient waveform transmission consistency of a direct current transformer, which are used for solving the problem of how to comprehensively evaluate the transient performance of the direct current transformer when the transient performance of the direct current transformer is tested, realizing that the transient performance of the direct current transformer and the transmission performance of the direct current transformer on complex waveforms can be comprehensively reflected by adopting signal difference, and saving time and improving efficiency without a large amount of data processing.
The invention is realized by the following technical scheme:
in a first aspect, the present application provides a method for evaluating transient waveform transmission consistency of a dc transformer, where the method includes:
acquiring a standard transient signal applied to the direct current transformer by a step voltage current source or a transient step signal source;
applying the standard transient step signal to the primary side of the direct current transformer, and collecting a sampling value output by a merging unit of the tested direct current transformer to obtain a first sampling value;
performing discrete interpolation calculation according to the first sampling value to obtain a first transient step signal;
calculating to obtain a first envelope region according to the standard transient signal;
calculating to obtain a second envelope area according to the first transient step signal;
calculating the difference value of the first envelope region and the second envelope region to obtain a signal difference value;
calculating the signal difference degree of the signal difference value and the first envelope area to obtain a signal value;
and evaluating the transmission performance of the transient waveform of the direct current transformer according to the signal value.
Further, the standard transient step signal is denoted as Sbz＝{x1,x2,…,xmAnd obtaining a sampling value output by the merging unit of the tested direct current transformer, and recording a first sampling value as Sbc＝{b1,b2,…,bn}。
Further, the first transient step signal is denoted as Sbc＝{y1,y2,…,yn}。
Further, the first envelope region:
wherein x isjIs the value of the j-th sampling point, T, of the standard transient signalcIs the sampling period of the standard transient step signal.
Further, the second envelope region:
wherein, ykIs the value of the kth sample point, T, of the first transient step signalbIs the sampling period of the first transient step signal.
Further, the signal difference value:
wherein x isjIs the value of the j-th sampling point, T, of the standard transient signalcIs the sampling period, y, of the standard transient step signalkIs the value of the kth sample point, T, of the first transient step signalbIs the sampling period of the first transient step signal, and Tc>Tb。
Further, the signal value:
in a second aspect, the present application further discloses a device for evaluating transient waveform transmission consistency of a dc transformer, where the device includes:
the transient state step signal acquisition unit is used for acquiring a standard transient state signal applied to the direct current transformer by a step voltage current source or a transient state step signal source; applying the standard transient step signal to the primary side of the direct current transformer, and collecting a sampling value output by a merging unit of the tested direct current transformer to obtain a first sampling value;
the signal unit is used for carrying out discrete interpolation calculation according to the first sampling value to obtain a first transient step signal;
the first envelope calculation unit is used for calculating a first envelope region according to the standard transient signal;
the second envelope calculation unit is used for calculating a second envelope area according to the first transient step signal;
a difference value calculation unit, configured to perform difference value calculation on the first envelope region and the second envelope region to obtain a signal difference value;
the signal difference calculation unit is used for calculating the signal difference between the signal difference and the first envelope area to obtain a signal value;
and the evaluation and analysis unit is used for evaluating the transmission and transformation performance of the transient waveform of the direct current transformer according to the result of the signal value.
According to the invention, signal difference degree calculation is carried out through the signal difference value and the first envelope area to obtain a signal value, and the transmission performance of the transient waveform of the direct current transformer is evaluated according to the signal value result; in addition, the technical scheme of the application is not limited by the sampling frequency of the tested direct current transformer, and the whole reaction is carried out from the enveloped region. By adopting the technical scheme, the transient characteristics of the direct current transformer can be reflected more comprehensively; the method and the device have the advantages that the phenomenon that evaluation is incomplete and inaccurate due to various factors is reduced, the transient characteristic of the direct current transformer can be more comprehensively reflected through calculation of the signal difference degree by judging the transmission performance of the direct current transformer to complex waveforms, a large amount of data processing is not needed, time is saved, and efficiency is improved.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
Fig. 1 is a flowchart of a method for evaluating transient waveform transmission consistency of a dc transformer according to the present application;
FIG. 2 is a waveform of an exemplary transient characteristic signal of the present application;
FIG. 3 is an overall waveform diagram of transient characteristics of the DC transformer of the present application;
FIG. 4 is a partial enlarged waveform diagram of transient characteristics of the DC transformer of the present application;
fig. 5 is a schematic structural diagram of an evaluation device for transient waveform transmission consistency of a dc transformer according to the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying 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.
The direct current transformer is an important device of a direct current transmission system, and a type test, a delivery test, a handover test and a period detection of the direct current transformer used in the system before installation are indispensable works for ensuring the safe operation of the direct current transmission system. The whole signal transmission of the direct current transformer relates to a plurality of links and provides important current and voltage signals for measurement and control and protection of a direct current system, and whether the steady state transmission accuracy, the frequency response and the transient response characteristic of the direct current transformer signals meet the requirements or not is the key point of safe operation of the direct current transmission system. Therefore, the method and the device for evaluating the transient waveform transmission consistency of the direct current transformer can reflect the transient characteristics of the direct current transformer more comprehensively; the method and the device have the advantages that the phenomenon that evaluation is incomplete and inaccurate due to various factors is reduced, the transient characteristic of the direct current transformer can be more comprehensively reflected through calculation of the signal difference degree by judging the transmission performance of the direct current transformer to complex waveforms, a large amount of data processing is not needed, time is saved, and efficiency is improved. The technical scheme of the application is explained in detail as follows:
referring to fig. 1, a flowchart of a method for evaluating transient waveform transmission consistency of a dc transformer is provided in the present application;
as can be seen from fig. 1, the method for evaluating the transient waveform transmission consistency of a dc transformer provided in the present application includes:
step S1: acquiring a standard transient signal applied to the direct current transformer by a step voltage current source or a transient step signal source;the standard transient step signal is denoted as Sbz＝{x1,x2,…,xj}。
Step S2: applying the standard transient step signal to the primary side of the direct current transformer, and collecting a sampling value output by a merging unit of the tested direct current transformer to obtain a first sampling value; the first sampling value is marked as Sbc＝{b1,b2,…,bk}。
Step S3: performing discrete interpolation calculation according to the first sampling value to obtain a first transient step signal, wherein the first transient step signal is marked as Sbc＝{y1,y2,…,yk}。
Step S4: calculating a first envelope region according to the standard transient signal, wherein the first envelope region is:
wherein x isjIs the value of the j-th sampling point, T, of the standard transient signalcThe first envelope region is a sampling period of the standard transient step signal, and the first envelope region is an area included by a waveform and a horizontal axis of the standard transient step signal.
Step S5: calculating according to the first transient step signal to obtain a second envelope region, wherein the second envelope region is:
wherein, ykIs the value of the kth sample point, T, of the first transient step signalbThe second envelope region is a sampling period of the first transient step signal, and the second envelope region is an area included by a waveform and a horizontal axis of the first transient step signal.
Step S6: performing difference calculation on the first envelope region and the second envelope region to obtain a signal difference, wherein the signal difference is as follows:
wherein x isjIs the value of the j-th sampling point, T, of the standard transient signalcIs the sampling period, y, of the standard transient step signalkIs the value of the kth sample point, T, of the first transient step signalbIs the sampling period of the first transient step signal, and Tc>Tb。
Step S7: and calculating the signal difference degree of the signal difference value and the first envelope region to obtain a signal value, wherein the signal value is the ratio of the signal difference value to the first envelope region:
step S8: evaluating the transmission performance of the transient waveform of the direct current transformer according to the signal value, and judging the transmission performance of the transient waveform of the direct current transformer according to the signal distortion ratio of SDR (signal distortion ratio); the signal distortion ratio is to calculate a ratio of the signal difference value in the present application to the first envelope region to obtain the signal value in the present application, where the signal value is normally between 0 and 0.001, and if the signal value is in a normal range, it is considered that the transient waveform of the dc transformer has no distortion, and if the signal value is not in the normal range, it indicates that the transient waveform of the dc transformer has worse transmission performance.
Referring to fig. 2 to 4, a typical transient characteristic signal waveform of the present application, an overall transient characteristic waveform diagram of the dc transformer of the present application, and a local amplification transient characteristic waveform diagram of the dc transformer of the present application are shown;
for example, as can be seen from fig. 2 to 4, the solid line represents the standard transient signal, and the dashed line represents the first transient step signal; 200 sampling data points are selected in the experiment and calculated according to the method, and the first envelope area S is obtainedbz＝5.970989729900293e +05, the second envelope region Sbc＝5.2235x105So that the difference value of the signal is S according to the calculated values of the first envelope region and the second envelope regionbz-bc 7.4650e +03, and finally obtaining the signal value SDR S from the signal difference and the first envelope regionbz-bc/Sbz0.0125. The calculation result shows that the signal value is not between 0 and 0.001, which indicates that the transient waveform of the direct current transformer has poor transmission performance.
Referring to fig. 5, a schematic structural diagram of a device for evaluating transient waveform transmission consistency of a dc transformer provided by the present application is shown;
as can be seen from fig. 5, the present application further provides an apparatus for evaluating transient waveform transmission consistency of a dc transformer, where the apparatus includes:
the transient state step signal acquisition unit 11 is configured to acquire a standard transient state step signal applied to the dc transformer by a step voltage current source or a step signal source, apply the standard transient state step signal to the primary side of the dc transformer through the standard transient state step signal, and then collect a sampling value output by the merging unit of the dc transformer to be measured; obtaining a first sampling value Sbc＝{b1,b2,…,bkThe standard transient step signal is denoted as Sbz＝{x1,x2,…,xj}。
A signal unit 12, configured to obtain the first sample value according to the transient step signal obtaining unit 11, and then perform discrete interpolation calculation to obtain a first transient step signal marked as Sbc＝{y1,y2,…,yk}；
A first envelope calculation unit 13, configured to calculate the standard transient signal according to the signal unit 12 to obtain a first envelope region, where:
wherein x isjIs the value of the j-th sampling point of the standard transient signal，TcIs the sampling period of the standard transient step signal.
A second envelope calculation unit 14, configured to calculate, according to the signal unit 12, the first transient step signal to obtain a second envelope region, where:
wherein, ykIs the value of the kth sample point, T, of the first transient step signalbIs the sampling period of the first transient step signal.
A difference calculating unit 15, configured to perform difference calculation on the first envelope region obtained by the first envelope calculating unit 13 and the second envelope region obtained by the second envelope calculating unit to obtain a signal difference, where the signal difference is:
wherein x isjIs the value of the j-th sampling point, T, of the standard transient signalcIs the sampling period, y, of the standard transient step signalkIs the value of the kth sample point, T, of the first transient step signalbIs the sampling period of the first transient step signal, and Tc>Tb。
A signal difference calculation unit 16, configured to perform signal difference calculation on the signal difference obtained by the difference calculation unit 15 and the first envelope region obtained by the first envelope calculation unit 13 to obtain a signal value, where:
and the evaluation and analysis unit 17 is used for evaluating the transmission performance of the transient waveform of the direct current transformer according to the signal value obtained by the signal difference calculation unit 16. The signal value is normally between 0 and 0.001, if the signal value is in a normal range, the transient waveform of the direct current transformer is considered to be transmitted without distortion, and if the signal value is not in the normal range, the transmission performance of the transient waveform of the direct current transformer is poor.
According to the method, signal difference degree calculation is carried out on the signal difference value and the first envelope area to obtain a signal value, and the transmission performance of the direct current transformer on transient waveforms is evaluated according to the result of the signal value; in addition, the technical scheme of the application is not limited by the sampling frequency of the tested direct current transformer, and the whole reaction is carried out from the enveloped region. Compared with the prior methods, the technical scheme of the application can reflect the transient characteristics of the direct current transformer more comprehensively; the method and the device have the advantages that the phenomenon that evaluation is incomplete and inaccurate due to various factors is reduced, the transient characteristic of the direct current transformer can be more comprehensively reflected through calculation of the signal difference degree by judging the transmission performance of the direct current transformer to complex waveforms, a large amount of data processing is not needed, time is saved, and efficiency is improved. Simultaneously, this application still provides a direct current transformer transient state waveform and passes and become uniformity evaluation device.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (8)
1. A method for evaluating transient waveform transmission consistency of a direct current transformer is characterized by comprising the following steps:
acquiring a standard transient signal applied to the direct current transformer by a step voltage current source or a transient step signal source;
applying the standard transient step signal to the primary side of the direct current transformer, and collecting a sampling value output by a merging unit of the tested direct current transformer to obtain a first sampling value;
performing discrete interpolation calculation according to the first sampling value to obtain a first transient step signal;
calculating to obtain a first envelope region according to the standard transient signal;
calculating to obtain a second envelope area according to the first transient step signal;
calculating the difference value of the first envelope region and the second envelope region to obtain a signal difference value;
calculating the signal difference degree of the signal difference value and the first envelope area to obtain a signal value;
and evaluating the transmission performance of the transient waveform of the direct current transformer according to the signal value.
2. The method according to claim 1, wherein the standard transient step signal is recorded as Sbz＝{x1,x2,…,xmAnd obtaining a sampling value output by the merging unit of the tested direct current transformer, and recording a first sampling value as Sbc＝{b1,b2,…,bn}。
3. The method for evaluating the consistency of the transient waveform transmission of the direct current transformer according to claim 1, wherein the first transient step signal is recorded as Sbc＝{y1,y2,…,yn}。
4. The method for evaluating the transient waveform transmission consistency of the direct current transformer according to claim 1, wherein the first envelope region is:
wherein x isjIs the value of the j-th sampling point, T, of the standard transient signalcIs the sampling period of the standard transient step signal.
5. The method for evaluating the transient waveform transmission consistency of the direct current transformer according to claim 1, wherein the second envelope region is:
wherein, ykIs the value of the kth sample point, T, of the first transient step signalbIs the sampling period of the first transient step signal.
6. The method for evaluating the transient waveform transmission consistency of the direct current transformer according to claim 4, wherein the signal difference value is:
wherein x isjIs the value of the j-th sampling point, T, of the standard transient signalcIs the sampling period, y, of the standard transient step signalkIs the value of the kth sample point, T, of the first transient step signalbIs the sampling period of the first transient step signal, and Tc>Tb。
7. The method according to claim 6, wherein the signal value is a ratio of the signal difference to the first envelope region:
8. a device for evaluating transient waveform transmission consistency of a direct current transformer is characterized by comprising:
the transient state step signal acquisition unit is used for acquiring a standard transient state signal applied to the direct current transformer by a step voltage current source or a transient state step signal source; applying the standard transient step signal to the primary side of the direct current transformer, and collecting a sampling value output by a merging unit of the tested direct current transformer to obtain a first sampling value;
the signal unit is used for carrying out discrete interpolation calculation according to the first sampling value to obtain a first transient step signal;
the first envelope calculation unit is used for calculating a first envelope region according to the standard transient signal;
the second envelope calculation unit is used for calculating a second envelope area according to the first transient step signal;
a difference value calculation unit, configured to perform difference value calculation on the first envelope region and the second envelope region to obtain a signal difference value;
the signal difference calculation unit is used for calculating the signal difference between the signal difference and the first envelope area to obtain a signal value;
and the evaluation and analysis unit is used for evaluating the transmission and transformation performance of the transient waveform of the direct current transformer according to the signal value.
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