CN113834991A - Analog quantity remote transmission method and device - Google Patents
Analog quantity remote transmission method and device Download PDFInfo
- Publication number
- CN113834991A CN113834991A CN202111107883.2A CN202111107883A CN113834991A CN 113834991 A CN113834991 A CN 113834991A CN 202111107883 A CN202111107883 A CN 202111107883A CN 113834991 A CN113834991 A CN 113834991A
- Authority
- CN
- China
- Prior art keywords
- analog quantity
- phase angle
- voltage signal
- current signal
- amplitude
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 83
- 238000000034 method Methods 0.000 title claims abstract description 53
- 238000004891 communication Methods 0.000 claims abstract description 26
- 238000006243 chemical reaction Methods 0.000 claims description 21
- 108010076504 Protein Sorting Signals Proteins 0.000 claims description 18
- 238000005070 sampling Methods 0.000 claims description 18
- 238000001228 spectrum Methods 0.000 claims description 14
- 230000015572 biosynthetic process Effects 0.000 claims description 10
- 238000003786 synthesis reaction Methods 0.000 claims description 10
- 230000000737 periodic effect Effects 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 24
- 238000007689 inspection Methods 0.000 abstract description 20
- 239000000284 extract Substances 0.000 abstract description 4
- 101150118300 cos gene Proteins 0.000 description 6
- 238000001514 detection method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 230000003068 static effect Effects 0.000 description 3
- 238000000605 extraction Methods 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 101100234408 Danio rerio kif7 gene Proteins 0.000 description 1
- 101100221620 Drosophila melanogaster cos gene Proteins 0.000 description 1
- 101100398237 Xenopus tropicalis kif11 gene Proteins 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
The application provides an analog quantity remote transmission method and device, collects the analog quantity that is used for examining electric power system secondary equipment through collection module, through the time domain waveform and the discretization of frequency domain waveform to the analog quantity extract eigenvalues such as amplitude, phase angle of analog quantity, then modulate the electromagnetic wave as the carrier through communication transmission module, will through operator's network eigenvalues such as amplitude, phase angle transmit to the receiving end of the analog quantity fitting module of each production scene, improved analog quantity transmission speed and rate of accuracy. And finally, fitting the demodulated characteristic values such as amplitude values, phase angles and the like into analog quantities by a receiving end arranged on each production site, transmitting the analog quantities to the secondary equipment of the power system to be inspected, and performing remote inspection on the secondary equipment of the power system.
Description
Technical Field
The application relates to the technical field of power system protection control, in particular to an analog quantity remote transmission method and device.
Background
The secondary equipment of the power system refers to auxiliary electrical equipment such as a relay for monitoring, controlling and protecting the working state of the primary equipment of the power system in production. The secondary equipment of the power system is often in a complex working environment, the working duration is long, and the secondary equipment is very easy to damage and age, so that the secondary equipment cannot normally operate and loss is brought to production. Therefore, the secondary equipment of the power system is periodically overhauled.
In the production process, two methods, namely static simulation and in-situ inspection, are used for overhauling secondary equipment of the power system. The static simulation method comprises the steps of inputting detection values to all parts of the secondary equipment of the power system, then collecting output responses of all parts of the secondary equipment of the power system to the detection values, then establishing models of all parts of the secondary equipment of the power system according to the input detection values and the collected output responses, and finally judging the running state of the secondary equipment of the power system by observing physical phenomena generated when the simulated secondary equipment of the power system runs. However, in the static simulation process, the process of establishing the model is very complicated. The local inspection is to input an instruction to the secondary equipment of the power system at a production site and judge the operation state of the secondary equipment of the power system by observing the output response of the secondary equipment. When the equipment to be inspected is distributed in a plurality of production sites, the inspection efficiency of in-situ inspection is low. With the development of communication technology, the remote intelligent inspection method with high inspection efficiency can also be used for inspecting secondary equipment of the power system.
The remote intelligent inspection method is an inspection method which transmits analog quantity to secondary equipment of the power system to be inspected through an operator network, observes output response of the secondary equipment of the power system to be inspected and then judges the running state. However, the instantaneous value of the analog quantity is directly transmitted through the operator network, and the analog quantity data is easy to distort, so that the detection result is inaccurate.
Disclosure of Invention
The application provides an analog quantity remote transmission method and device, which are used for solving the problem that analog quantity transmission is difficult when secondary equipment of a power system is remotely checked.
The application provides an analog quantity remote transmission method and a device, which realize remote equipment inspection by establishing a master control center and establishing a control signal receiving end at each production site, and comprises the following steps:
collecting analog quantity by using a collection module; the analog quantity comprises a voltage signal and a current signal.
And extracting the voltage signal amplitude, the voltage signal phase angle, the current signal amplitude and the current signal phase angle of the analog quantity by using a discrete Fourier transform method.
And transmitting the voltage signal amplitude, the voltage signal phase angle, the current signal amplitude and the current signal phase angle to an analog quantity fitting module through an operator network by a communication transmission module.
And D/A conversion operation is carried out on the amplitude and the phase angle through an analog quantity fitting module, and the amplitude and the phase angle are fitted into the analog quantity.
And the analog quantity fitting module is used for conveying the analog quantity to the electric equipment to be inspected.
The improvement of the analog quantity remote transmission method is combined with the establishment of a master control center and the establishment of a control signal receiving end in each production field to realize the remote inspection of the secondary equipment of the power system, and the key point is to solve the problem of difficult analog quantity transmission.
And generating analog quantity for inspecting the secondary equipment of the power system at the master control center, wherein the analog quantity mainly comprises a voltage signal and a current signal, and selecting the type of the analog quantity according to the secondary equipment of the inspected power system. The time domain and the frequency domain of the acquired analog quantity are calculated, information such as the amplitude value and the phase angle of the analog quantity is extracted, the distortion condition is not easy to occur when the digital quantity such as the amplitude value and the phase angle is remotely transmitted, and the transmission accuracy is improved. The process of splitting and fitting the analog quantity reduces the requirements on the sampling frequency and the transmission speed of the acquisition equipment and the transmission equipment.
The step of extracting the voltage signal amplitude, the voltage signal phase angle, the current signal amplitude and the current signal phase angle of the analog quantity by Fourier transform comprises the following steps:
and sampling the analog quantity according to the sampling frequency to obtain a sampling signal after the analog quantity is sampled.
And windowing the sampling signal to intercept a signal sequence of one period.
And carrying out convolution operation on the signal sequence by utilizing the frequency domain convolution characteristic of the signal to obtain the periodic continuous frequency spectrum of the signal sequence.
And multiplying the periodic continuous spectrum by a periodic sequence pulse function to obtain the discretization spectrum of the signal sequence.
And obtaining the voltage signal amplitude, the voltage signal phase angle, the current signal amplitude and the current signal phase angle of the analog quantity by the discretization frequency spectrum.
The step of transmitting the voltage signal amplitude, the voltage signal phase angle, the current signal amplitude and the current signal phase angle to the analog quantity fitting module by the communication transmission module comprises the following steps:
and the communication transmission module receives the voltage signal amplitude, the voltage signal phase angle, the current signal amplitude and the current signal phase angle of the analog quantity.
The communication transmission module modulates electromagnetic waves according to a transmission protocol to serve as carrier waves for transmitting voltage signal amplitude, voltage signal phase angle, current signal amplitude and current signal phase angle data.
The communication transmission module sends the electromagnetic wave to the analog quantity fitting module.
The step of the analog fitting module fitting the voltage signal amplitude, voltage signal phase angle, current signal amplitude and current signal phase angle to the voltage signal and the current signal comprises:
and the receiving end of the analog quantity fitting module receives the electromagnetic wave.
And the amplitude and the phase angle of the analog quantity are converted into machine codes which can be identified by a machine through modulation and demodulation operations, and then the machine codes are transmitted to receiving ends of various production fields through an operator network. The transmission efficiency is high, and a transmission method is provided for remotely checking the secondary equipment of the power system.
And the analog quantity fitting module demodulates the machine code into the voltage signal amplitude, the voltage signal phase angle, the current signal amplitude and the current signal phase angle according to a transmission protocol.
And the analog quantity fitting module converts the voltage signal amplitude and the voltage signal phase angle into the voltage signal through digital-to-analog conversion operation and vector synthesis operation.
The analog quantity fitting module converts the current signal amplitude and the current signal phase angle into the current signal through digital-to-analog conversion operation and vector synthesis operation.
Converting the four digital quantities of the voltage signal amplitude, the voltage signal phase angle, the current signal amplitude and the current signal phase angle into the analog quantity through digital-to-analog conversion operation and vector synthesis operation: the steps of the voltage signal and the current signal include:
the analog quantity fitting module sets a weight value for digital-to-analog conversion.
And the analog quantity fitting module calculates each counting digit of the digital quantity according to the weight value to obtain the sub-analog quantity corresponding to each counting digit.
And the analog quantity fitting module adds the sub analog quantities to obtain the analog quantity which is in direct proportion to the digital quantity.
The present application further provides a remote analog transmission device, including: the system comprises an acquisition module, a communication transmission module and an analog quantity fitting module;
the acquisition module is used for acquiring analog quantity; the analog quantity comprises a voltage signal and a current signal;
the communication transmission module is used for extracting the voltage signal amplitude, the voltage signal phase angle, the current signal amplitude and the current signal phase angle of the analog quantity by using a discrete Fourier transform method;
the communication transmission module is also used for transmitting the voltage signal amplitude, the voltage signal phase angle, the current signal amplitude and the current signal phase angle to the analog quantity fitting module through an operator network;
the analog quantity fitting module is used for carrying out digital-to-analog conversion operation on the amplitude value and the phase angle and fitting the amplitude value and the phase angle into the analog quantity;
the analog quantity fitting module is also used for transmitting the analog quantity to the electric equipment to be inspected.
This application is through the analog quantity of collection inspection electric power system secondary equipment of collection module, and the eigenvalues such as amplitude, phase angle of extraction analog quantity through calculation on time domain, the frequency domain again are right after that through communication transmission module eigenvalues such as amplitude, phase angle modulate and demodulate the teletransmission who has realized the analog quantity, have improved analog quantity transmission speed and rate of accuracy. And finally, the demodulated digital quantities such as amplitude values, phase angles and the like are simulated into analog quantities by the receiving end arranged on each production site, and the analog quantities are transmitted to the secondary equipment of the power system to be inspected to remotely inspect the secondary equipment of the power system, so that the inspection efficiency of the secondary equipment of the power system 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 creative efforts.
FIG. 1 is a schematic flow chart of an analog quantity remote transmission method;
FIG. 2 is a schematic flow chart of a method for extracting the amplitude and phase angle of an analog quantity;
FIG. 3 is a schematic diagram of amplitude and phase angle transmission flow;
FIG. 4 is a schematic diagram of an analog fitting process.
Detailed Description
Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following examples do not represent all embodiments consistent with the present application. But merely as exemplifications of systems and methods consistent with certain aspects of the application, as recited in the claims.
The method is applied to remote inspection of the secondary equipment of the power system, firstly a master control center is established, and then control signal receiving ends are established on each production site to send and receive analog quantity required by inspection of the secondary equipment of the power system. Firstly, generating analog quantity for detection by a master control center according to the working characteristics of secondary equipment of the power system to be detected, and then starting to transmit the analog quantity. The following describes the analog quantity transmission method with reference to fig. 1, fig. 2, fig. 3, and fig. 4, and fig. 1 is a schematic flow chart of the analog quantity remote transmission method. FIG. 2 is a flow chart of a method for extracting the amplitude and phase angle of an analog quantity. Fig. 3 is a schematic diagram of amplitude and phase angle transmission flow. FIG. 4 is a schematic diagram of an analog fitting process. The method comprises the following steps:
s100: the data acquisition module acquires analog quantity.
In this embodiment, an RTDS (Real Time Digital Simulator) is adopted to collect an analog quantity, where the analog quantity is a voltage or current value of a primary device of a power system. When the remote inspection of the secondary equipment of the power system is carried out, the minimum operation period of the control protection board card is 100 mus, so the operation step length is set to be 100 mus in the RTDS. The corresponding sampling rate is 10000Hz, i.e. every 100 mus, the RTDS collects a set of analog data. If other simulation tools or acquisition modules are used for acquiring the analog quantity, the minimum sampling rate is required to be 1200 Hz. After the analog quantity is collected, the amplitude value and the phase angle of the analog quantity are extracted.
S200: the discrete fourier transform extracts the magnitude and phase angle of the analog quantity.
S201: and windowing the sampling signal to intercept a signal sequence of one period.
The windowing is a time-domain truncation, the sampling signal obtained in S100 is theoretically a discrete sequence with infinite time, and for convenience of storage, analysis, and processing, only a sampling sequence with finite length is taken in this embodiment. A finite length of processing must be intercepted from the time series of sampled signals, which is equivalent to multiplying the resulting sampled signals by a rectangular window function to obtain a cycle-length signal sequence that appears in the time domain as a discrete time series.
S202: and carrying out convolution operation on the signal sequence by utilizing the frequency domain convolution characteristic of the signal to obtain the periodic continuous frequency spectrum of the signal sequence.
In order to obtain discrete data which can be processed by a computer or a digital signal processor, the signal sequence also needs to be subjected to frequency domain discretization. The frequency domain portion of the signal sequence is discretized using the frequency domain convolution theorem for the signal. The frequency domain convolution theorem is as follows: the frequency domain convolution theorem is the product in the time domain corresponding to convolution in the frequency domain, and the product of the fourier transforms of the two functions is equal to their convolved fourier transform. And multiplying the periodic continuous spectrum by a periodic sequence pulse function to obtain the discretization spectrum of the signal sequence. And after obtaining the discretization frequency spectrum of the signal sequence, extracting the characteristic value of the discretization frequency spectrum, namely extracting the amplitude value and the phase angle.
S203: and obtaining the voltage signal amplitude, the voltage signal phase angle, the current signal amplitude and the current signal phase angle of the analog quantity by the discretization frequency spectrum. And carrying out fast Fourier transform on the discretization frequency domain sampling function to obtain the amplitude and the phase angle of the analog quantity. Based on the periodicity and symmetry of the analog quantity signal sequence, the fast Fourier transform arranges the frequency domain signal sequence according to even and odd, and carries out iteration according to stages. In the step-by-step iterative computation, output data obtained each time is stored in an original unit for storing input data, the method is a step-by-step computation, and the use of a large number of data registers is saved, so that the multiplication times required by discrete Fourier transform can be greatly reduced by the fast Fourier transform method, and the more the number of transformed sampling points is, the more computation time is saved by the fast Fourier transform method is.
The amplitude and the phase angle are transmitted to a transmission module from an acquisition module, a weight is set in the transmission module firstly to convert the amplitude and the phase angle into binary numbers, and then electromagnetic waves are modulated to serve as carrier waves to transmit the binary numbers converted from the amplitude and the phase angle.
S300: and transmitting the amplitude and the phase angle of the analog quantity to the analog quantity fitting module through the transmission module. And the transmission module transmits the amplitude and the phase angle to the receiving end of the analog quantity fitting module of each production site through an operator network. The condition that the analog quantity is distorted due to network delay in the process of directly transmitting the analog quantity is avoided, and the accuracy and the efficiency of data transmission are improved.
S301: and the communication transmission module receives the voltage signal amplitude, the voltage signal phase angle, the current signal amplitude and the current signal phase angle of the analog quantity. The received amplitude and phase angle data need to be converted into binary numbers and then transmitted to a receiving end through modulated electromagnetic waves.
S302: and the communication transmission module modulates the data of the voltage signal amplitude, the voltage signal phase angle, the current signal amplitude and the current signal phase angle to be transmitted into electromagnetic waves carrying the data according to a transmission protocol. The electromagnetic wave modulated by the modulation method is suitable for the current operator transmission network and the wireless transmission network provided by the operator. For example, QAM (Quadrature Amplitude Modulation) and QPSK (Quadrature Phase Shift Keying) Modulation methods used in 3G and 4G communication transmission technologies. The 5G communication transmission technology adds pi/2-BPSK (Binary Phase Shift Keying) technology without changing carrier amplitude on the basis of the transmission function including 3G and 4G.
S303: and the communication transmission module sends the modulated electromagnetic waves to the analog quantity fitting module. The electromagnetic wave is transmitted through a commercial network of an operator, and the transmission condition is convenient.
In this embodiment, the operator 5G network is used to transmit the amplitude and the phase angle of the analog quantity to the data receiving end of each production site, and then the data receiving end transmits the demodulated amplitude and phase angle to the analog quantity fitting module. The data is transmitted by using a 5G network, namely, the data is transmitted by using an electromagnetic wave signal as a carrier wave, and the amplitude, the frequency and the phase of the electromagnetic wave are required to be modulated to generate different waveforms to represent a plurality of groups of data. In this embodiment, a QAM method is used to modulate the amplitude and the phase angle, and 16QAM is used as an example, and the modulating step includes:
a weight is set for converting the magnitude and phase angle into binary numbers.
And converting the values of the amplitude value and the phase angle into a string of binary sequences according to weights.
A string of binary sequences is put into serial/parallel conversion, 4-bit division is carried out, and then 2-bit division is carried out. The odd-numbered parts are sent to the in-phase path and the even-numbered parts are sent to the orthogonal path.
And the odd part and the even part are subjected to 2/L level conversion, namely binary numbers are converted into decimal numbers, and the decimal numbers respectively correspond to numerical values on a preset constellation diagram.
The low-frequency jitter wave in the modulation waveform is eliminated by a low-pass filter.
The modulated waveform enters a multiplier, and the multiplication of a carrier wave cos (omega ct) and an in-phase path wave sl (t) becomes cos (omega ct) sl (t). After the carrier cos (ω ct) is shifted by 90 degrees in phase, the carrier cos (ω ct) is multiplied by the orthogonal path wave SQ (t) to obtain-SQ (t) sin (ω ct).
After the two paths of waveforms pass through a multiplier, the two paths of waveforms are added through an adder to obtain sl (t) cos (omega ct) -SQ (t) sin (omega ct).
And the communication module transmits the adjusted electromagnetic waves to data receiving ends of various production fields through an operator 5G network.
The serial/parallel conversion means that one information stream is divided into two signals, the two signals are transmitted simultaneously, and the transmission time is half of the original required time.
S400: and the analog quantity fitting module fits the received amplitude and phase angle into analog quantities such as voltage signals or current signals. The analog quantity fitting module demodulates electromagnetic waves to restore original binary signal waveforms, and finally calculates amplitude values and phase angles corresponding to the binary signals according to weight values set during sending of the original binary signals.
S401: the analog quantity fitting module demodulates the electromagnetic waves into binary numbers according to a transmission protocol, and then restores the corresponding binary numbers into the voltage signal amplitude, the voltage signal phase angle, the current signal amplitude and the current signal phase angle according to weights. The method comprises the following specific steps:
after receiving the modulated electromagnetic wave, the receiving end of the analog quantity fitting module multiplies the modulated electromagnetic wave in a multiplier, and extracts an in-phase component and a quadrature component by shifting a 90-degree phase.
The in-phase component is: yl ═ sl (t)/2+1/2 × (sl (t) cos2(ω ct) -sq (t) sin (2 ω ct)).
The orthogonal components are: yQ ═ sq (t)/2-1/2 × (sl (t) sin (2 ω ct) + sq (t) cos (2 ω ct)).
The in-phase component and the quadrature component enter a low-pass filter to form an envelope waveform.
And the envelope waveform enters a sampling decision device, and sampling points are selected to form an original binary rectangular wave.
The binary rectangular wave enters serial/parallel conversion, and an original binary signal is formed according to the parity allocation rule during transmission.
And finally, calculating the corresponding amplitude and phase angle of the binary signal according to the weight.
S402: and the analog quantity fitting module converts the voltage signal amplitude and the voltage signal phase angle into the voltage signal through digital-to-analog conversion operation and vector synthesis operation.
S403: the analog quantity fitting module converts the current signal amplitude and the current signal phase angle into the current signal through digital-to-analog conversion operation and vector synthesis operation.
And fitting the waveforms of the voltage and the current by combining the characteristic values of the two analog quantities of the amplitude and the phase angle in a vector synthesis mode. And then, according to the working characteristics of the secondary equipment of the electric power to be detected, the voltage or current signal is transmitted to the secondary equipment of the electric power to be detected for performance detection.
S500: and the analog quantity fitting module outputs the fitted analog quantity to the electric power secondary equipment to be detected.
The analog quantity fitting module sets a digital-to-analog conversion weight value for digital-to-analog conversion.
And the analog quantity fitting module calculates each counting digit of the digital quantity according to the weight value to obtain a sub-analog quantity corresponding to each counting digit.
And the analog quantity fitting module adds the sub analog quantities to obtain the analog quantity which is in direct proportion to the digital quantity.
And fitting the waveform of the analog quantity by using the amplitude value and the phase angle through a digital-to-analog conversion function and a vector synthesis algorithm in the analog quantity fitting module, and transmitting the waveform to secondary equipment of the electric power system to be inspected.
The application the remote analog quantity transmission method increases the remote transmission capability on the basis of meeting the basic requirements of the production process, and the secondary equipment of the power system to be inspected is more flexibly inspected on the condition that the secondary equipment is distributed on a plurality of production sites, so that the inspection efficiency is improved. The embodiment also designs a scheme for verifying the feasibility of the remote analog quantity transmission method, which comprises the following specific contents:
and comparing the analog quantity output delay, the fault judgment time, the waveform deviation and the continuous distortion time in the three transmission processes by adopting three analog quantity transmission modes to obtain a conclusion.
Scheme 1 is directly exported the analog quantity to waiting to examine electric power secondary equipment through the peripheral hardware integrated circuit board after generating the analog quantity by RTDS, wait to examine electric power secondary equipment and be the steady control device.
According to the scheme 2, the RTDS generates analog quantity, the analog quantity is subjected to amplitude value and phase angle extraction through the acquisition module, the amplitude value and the phase angle are fitted into the analog quantity through the analog quantity fitting module, and finally the analog quantity is directly transmitted to the stability control device through the transmission interface.
Scheme 3 is operated completely according to the actual flow in the production process. The method comprises the steps of collecting analog quantity data generated by primary electric power equipment, extracting an amplitude value and a phase angle of the analog quantity through a collection module, transmitting the amplitude value and the phase angle to an analog quantity fitting module through an operator network, combining the amplitude value and the phase angle by the analog quantity fitting module, fitting an analog quantity waveform through vector synthesis operation, and transmitting the analog quantity to a stability control device.
When the three schemes are executed, the output waveforms of the measured stability control device during the three schemes are respectively collected, and the feasibility of the analog quantity transmission method is demonstrated by making a table based on the waveforms and waveform related data.
| Comparison index | Scheme 1 | Scheme 2 | Scheme 3 |
| Analog output delay | 0ms | 6ms | 27ms |
| Determining time of failure | 178ms | 184ms | 197ms |
| Maximum deviation of normal operating waveform | 0 | 1.73％ | 1.85％ |
| Maximum deviation of fault waveform | 0 | 2.91％ | 3.73％ |
| Maximum continuous distortion time | 0 | 6ms | 8ms |
As can be seen from the data in the table, the analog output of the schemes 2 and 3 has a certain delay compared with the scheme 1, and the delay is respectively 6ms and 27 ms. In the implementation process of the scheme 3, the real-time delay of the operator network is 20ms, so that the analog quantity output delay of the scheme three is large. However, for the analog quantity output by the three schemes, the stability control device can make judgment correctly and trip, the judgment time is 178ms, 184ms and 197ms respectively, and the judgment time difference is very small.
When the measured stability control device works normally, the analog quantity transmission methods of the scheme 2 and the scheme 3 have certain influence on the output waveform of the measured stability control device, 1.73% and 1.85% of phase deviation are generated respectively, the phase deviation is less than 2% within an allowable error range, and after the waveform is translated, the output waveforms are completely overlapped, which indicates that the analog quantity transmission methods of the scheme 2 and the scheme 3 cannot influence the measured stability control device in a normal working state.
And simulating an interval three-phase fault by the RTDS, continuously tripping the three-phase power after 0.1s, and acquiring the output waveform of the tested stability control device. The analog quantity transmission methods of the scheme 2 and the scheme 3 also have certain influence on the output waveforms of the stability control device when a fault occurs, 2.91% phase deviation and 3.73% phase deviation are generated respectively, the phase deviations are smaller than 4% and are within an allowable error range, and after the waveforms are translated, the output waveforms are basically overlapped and meet the production test requirements.
Under the fault working state, a distortion time of about 5 ms-8 ms is generated in the scheme 2 and the scheme 3 relative to the transmission mode of the scheme 1, wherein the 5ms distortion time is the interval time of 5ms existing in the process of transmitting the analog quantity, so the maximum continuous time actually generated in the transmission process of the scheme 2 and the scheme 3 is in the range of 1 ms-3 ms, the fault judgment of the stability control device cannot be substantially influenced, and the production and use standards are met.
Therefore, the analog quantity transmission method adopted by the application is effective in actual production. Compared with a board card for transmitting analog data, the remote transmission has more flexibility, and has higher inspection efficiency under the condition that the power system to be inspected is secondary equipment on multiple production sites.
This application is through the analog quantity of collection inspection electric power system secondary equipment of collection module, through time domain waveform and the discretization of frequency domain waveform to the analog quantity extract characteristic values such as amplitude, phase angle of analog quantity, after that through communication transmission module modulation electromagnetic wave as the carrier, will through the operator network characteristic values such as amplitude, phase angle transmit to the receiving end of the analog quantity fitting module of each production scene, have improved analog quantity transmission speed and rate of accuracy. And finally, fitting the demodulated characteristic values such as amplitude values, phase angles and the like into analog quantities by a receiving end arranged on each production site, transmitting the analog quantities to the secondary equipment of the power system to be inspected, and performing remote inspection on the secondary equipment of the power system.
The embodiments provided in the present application are only a few examples of the general concept of the present application, and do not limit the scope of the present application. Any other embodiments extended according to the scheme of the present application without inventive efforts will be within the scope of protection of the present application for a person skilled in the art.
Claims (6)
1. An analog quantity remote transmission method is characterized by comprising the following steps:
collecting analog quantity by using a collection module; the analog quantity comprises a voltage signal and a current signal;
extracting the voltage signal amplitude, the voltage signal phase angle, the current signal amplitude and the current signal phase angle of the analog quantity by using a discrete Fourier transform method;
transmitting the voltage signal amplitude, the voltage signal phase angle, the current signal amplitude and the current signal phase angle to an analog quantity fitting module through an operator network by a communication transmission module;
performing digital-to-analog conversion operation on the amplitude value and the phase angle through an analog quantity fitting module, and fitting the amplitude value and the phase angle into the analog quantity;
and the analog quantity fitting module is used for conveying the analog quantity to the electric equipment to be inspected.
2. The method of claim 1, wherein the step of extracting the voltage signal magnitude, voltage signal phase angle, current signal magnitude and current signal phase angle of the analog quantity by the discrete fourier transform comprises:
sampling the analog quantity according to a sampling frequency to obtain a sampling signal after the analog quantity is sampled;
windowing the sampling signal to intercept a signal sequence of a period;
carrying out convolution operation on the signal sequence by utilizing the frequency domain convolution characteristic of the signal to obtain a periodic continuous frequency spectrum of the signal sequence;
multiplying the periodic continuous frequency spectrum with a periodic sequence pulse function to obtain a discretization frequency spectrum of the signal sequence;
and obtaining the voltage signal amplitude, the voltage signal phase angle, the current signal amplitude and the current signal phase angle of the analog quantity by the discretization frequency spectrum.
3. The analog quantity remote transmission method according to claim 1, wherein the step of the communication transmission module transmitting the voltage signal amplitude, voltage signal phase angle, current signal amplitude and current signal phase angle to the analog quantity fitting module:
the communication transmission module receives a voltage signal amplitude, a voltage signal phase angle, a current signal amplitude and a current signal phase angle of the analog quantity;
the communication transmission module modulates electromagnetic waves according to a transmission protocol to serve as a carrier to transmit a voltage signal amplitude, a voltage signal phase angle, a current signal amplitude and a current signal phase angle;
the communication transmission module sends the electromagnetic wave to the analog quantity fitting module.
4. The analog quantity remote transmission method according to claim 3, wherein said analog quantity fitting module fits said voltage signal amplitude, voltage signal phase angle, current signal amplitude and current signal phase angle to said voltage signal and said current signal:
the receiving end of the analog quantity fitting module receives the electromagnetic wave;
the analog quantity fitting module demodulates the electromagnetic waves into the voltage signal amplitude, the voltage signal phase angle, the current signal amplitude and the current signal phase angle according to a transmission protocol;
the analog quantity fitting module converts the voltage signal amplitude and the voltage signal phase angle into the voltage signal through digital-to-analog conversion operation and vector synthesis operation;
the analog quantity fitting module converts the current signal amplitude and the current signal phase angle into the current signal through digital-to-analog conversion operation and vector synthesis operation.
5. The method for remote transmission of analog quantity according to claim 4, wherein said four digital quantities of voltage signal amplitude, voltage signal phase angle, current signal amplitude and current signal phase angle are converted into said analog quantity by digital-to-analog conversion operation: voltage signal and current signal:
the analog quantity fitting module sets a weight value for digital-to-analog conversion;
the analog quantity fitting module calculates each counting bit of the digital quantity according to the weight value to obtain a sub-analog quantity corresponding to each counting bit;
and the analog quantity fitting module adds the sub analog quantities to obtain the analog quantity which is in direct proportion to the digital quantity.
6. A remote analog transmission device, comprising: the system comprises an acquisition module, a communication transmission module and an analog quantity fitting module;
the acquisition module is used for acquiring analog quantity; the analog quantity comprises a voltage signal and a current signal;
the communication transmission module is used for extracting the voltage signal amplitude, the voltage signal phase angle, the current signal amplitude and the current signal phase angle of the analog quantity by using a discrete Fourier transform method;
the communication transmission module is also used for transmitting the voltage signal amplitude, the voltage signal phase angle, the current signal amplitude and the current signal phase angle to the analog quantity fitting module through an operator network;
the analog quantity fitting module is used for carrying out digital-to-analog conversion operation on the amplitude value and the phase angle and fitting the amplitude value and the phase angle into the analog quantity;
the analog quantity fitting module is also used for transmitting the analog quantity to the electric equipment to be inspected.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111107883.2A CN113834991B (en) | 2021-09-22 | 2021-09-22 | Analog quantity remote transmission method and device |
| PCT/CN2021/124634 WO2023044999A1 (en) | 2021-09-22 | 2021-10-19 | Method and apparatus for remote transmission of analog quantity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111107883.2A CN113834991B (en) | 2021-09-22 | 2021-09-22 | Analog quantity remote transmission method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113834991A true CN113834991A (en) | 2021-12-24 |
| CN113834991B CN113834991B (en) | 2024-04-19 |
Family
ID=78960163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111107883.2A Active CN113834991B (en) | 2021-09-22 | 2021-09-22 | Analog quantity remote transmission method and device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN113834991B (en) |
| WO (1) | WO2023044999A1 (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0146440A1 (en) * | 1983-11-15 | 1985-06-26 | Max Michel | Modulation method and system for the simultaneous transmission of analogous signals and digital signals |
| CN204516020U (en) * | 2015-03-24 | 2015-07-29 | 国家电网公司 | A kind of radio transmitting device for voltage analog in intelligent substation |
| CN105162488A (en) * | 2015-08-21 | 2015-12-16 | 山东三江电子工程有限公司 | Device for wirelessly transmitting analogue data |
| JP2017158028A (en) * | 2016-03-01 | 2017-09-07 | 日本電信電話株式会社 | Signal transmission system |
| CN109217928A (en) * | 2018-10-23 | 2019-01-15 | 中国科学院合肥物质科学研究院 | A kind of method that analog signal is transmitted at a distance |
| CN109471390A (en) * | 2018-11-09 | 2019-03-15 | 西安麦格米特电气有限公司 | Analog signal transmission method, apparatus and microcontroller |
| CN110673509A (en) * | 2019-09-19 | 2020-01-10 | 中国电力科学研究院有限公司 | Electric quantity transmitter simulation system and method for semi-physical simulation platform |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008032407A1 (en) * | 2006-09-15 | 2008-03-20 | Fujitsu Limited | Apparatus and method for transmitting signals by use of multicarrier system |
| CN101179356A (en) * | 2007-11-28 | 2008-05-14 | 中国海洋石油总公司 | Data transmitting, receiving method and device |
| CN101751773B (en) * | 2008-12-12 | 2012-02-15 | 江苏省电力公司扬州供电公司 | Modulation-demodulation method for modulation-demodulation circuit of electric power electric information remote transmission |
| CN106249689A (en) * | 2016-09-19 | 2016-12-21 | 东北大学 | A kind of based on the electric melting magnesium furnace data collecting system being wirelessly transferred and method |
| US11391834B2 (en) * | 2018-02-28 | 2022-07-19 | Illusense, Inc. | Method and device for interferometric range measurements |
| CN112449429B (en) * | 2019-09-05 | 2023-11-21 | 成都华为技术有限公司 | Signal transmission method and communication device |
| CN112925230A (en) * | 2019-12-06 | 2021-06-08 | 南京南瑞继保电气有限公司 | Multifunctional analog quantity unified acquisition module for transformer substation |
-
2021
- 2021-09-22 CN CN202111107883.2A patent/CN113834991B/en active Active
- 2021-10-19 WO PCT/CN2021/124634 patent/WO2023044999A1/en unknown
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0146440A1 (en) * | 1983-11-15 | 1985-06-26 | Max Michel | Modulation method and system for the simultaneous transmission of analogous signals and digital signals |
| CN204516020U (en) * | 2015-03-24 | 2015-07-29 | 国家电网公司 | A kind of radio transmitting device for voltage analog in intelligent substation |
| CN105162488A (en) * | 2015-08-21 | 2015-12-16 | 山东三江电子工程有限公司 | Device for wirelessly transmitting analogue data |
| JP2017158028A (en) * | 2016-03-01 | 2017-09-07 | 日本電信電話株式会社 | Signal transmission system |
| CN109217928A (en) * | 2018-10-23 | 2019-01-15 | 中国科学院合肥物质科学研究院 | A kind of method that analog signal is transmitted at a distance |
| CN109471390A (en) * | 2018-11-09 | 2019-03-15 | 西安麦格米特电气有限公司 | Analog signal transmission method, apparatus and microcontroller |
| CN110673509A (en) * | 2019-09-19 | 2020-01-10 | 中国电力科学研究院有限公司 | Electric quantity transmitter simulation system and method for semi-physical simulation platform |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113834991B (en) | 2024-04-19 |
| WO2023044999A1 (en) | 2023-03-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0226210A2 (en) | Method for locating a fault on a power line and equipment for carrying out the method | |
| Nanayakkara et al. | Traveling-wave-based line fault location in star-connected multiterminal HVDC systems | |
| CN105044524B (en) | A kind of arrester monitoring method and system suitable for intelligent substation | |
| Aalamifar et al. | Modelling power line communication using network simulator-3 | |
| US10942209B2 (en) | Floating neutral detection and localization system and methods | |
| EP0238284A1 (en) | Analysis of digital radio transmissions | |
| CN103414523B (en) | Method for measuring modulation quality parameters based on software radio technology and system | |
| CN104333408A (en) | Inter-satellite communication system used for realizing high-dynamic and low-delay space teleoperation | |
| CN102857304B (en) | Error Vector Magnitude determines method and device, signal transmitter | |
| WO2018191436A1 (en) | Floating neutral detection and localization system and methods | |
| CN105915404B (en) | The test macro of SpaceWire network link signal quality and the evaluation method of signal quality | |
| CN113834991B (en) | Analog quantity remote transmission method and device | |
| CN1627742B (en) | Demodulation apparatus and method, and integrated circuit of demodulation apparatus | |
| Huai et al. | Combined line fault location method for MMC–HVDC transmission systems | |
| CN116520095B (en) | Fault location method, system and computer readable storage medium | |
| CN115047287A (en) | Method and system for positioning fault cable core of nuclear power instrument control cable | |
| CN105612674A (en) | Method and device for signaling and controlling a power grid coupling a plurality of actuators | |
| CN102175948B (en) | The proving installation of circuit physical parameter, method and single-board device | |
| CN212623123U (en) | Cable detector device capable of dynamically filtering environmental interference | |
| CN113992238A (en) | Quantitative test analysis method, device and system for carrier communication performance | |
| KR101304239B1 (en) | Diagnostic device for power line communication | |
| US10243595B2 (en) | Detection method and device for digital intermediate frequency processing system, and computer storage medium | |
| CN105403819A (en) | Insulating property testing system of power cable | |
| Farughian et al. | Power line signalling based earth fault location | |
| CN109831027A (en) | A kind of flexible testing and analysis system of distribution network electric energy quality |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |