CN112379324A - Step response detection system of direct current transformer based on steepening leading edge current source - Google Patents
Step response detection system of direct current transformer based on steepening leading edge current source Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 24
- 238000006243 chemical reaction Methods 0.000 claims abstract description 48
- 238000005070 sampling Methods 0.000 claims description 18
- 238000000605 extraction Methods 0.000 claims description 6
- 238000004088 simulation Methods 0.000 claims description 6
- 230000000087 stabilizing effect Effects 0.000 claims description 6
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- 238000002955 isolation Methods 0.000 claims description 3
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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
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
Abstract
The invention relates to a step response detection system of a direct current transformer based on a steeped leading edge current source, which comprises a steeped leading edge current source, an analog acquisition unit, a digital acquisition unit, an analog-to-digital conversion unit, a digital-to-analog conversion unit and a tester compatible with analog quantity and digital quantity step characteristics. The invention can simultaneously detect the direct current transformer with analog quantity output and digital quantity output, meets the requirement of relevant regulations of field calibration and calibration tests of the direct current transformer on accuracy, and avoids the influence caused by the fault of the direct current transformer.
Description
Technical Field
The invention belongs to the field of detection of direct current metering equipment, and particularly relates to a step response detection system of a direct current transformer based on a steepening front-edge current source.
Background
The direct current transformer is a main device for measuring the direct current magnitude transformation in the direct current transmission and distribution system, and the characteristic parameters and key indexes of the direct current transformer are directly related to the stable operation of the direct current transmission system. In actual operation, the transient characteristics of the direct current transformer affect the stable operation of a direct current system, and great economic loss is caused. Therefore, effective field detection and test needs to be performed on the direct current transformer before the direct current transformer is put into operation and during operation, so that the actual performance and the operation condition of the direct current transformer are judged on the field, and the influence caused by the transient characteristic of the direct current transformer is avoided.
When transient characteristics are detected, the technical level of the existing test equipment is high in difficulty of a transient high-current power supply required by transient characteristic test, and the requirement of standard specification cannot be met. Therefore, the application range of the detection technology of the direct current transformer is limited by the defects.
With the increase of domestic direct current projects, new requirements are provided for the calibration of the direct current transformers, relevant regulations and technical standards of field calibration and calibration tests of the direct current transformers are written, the direct current power distribution network is rapidly developed at the present stage and is an indispensable important component of the future power distribution network, and the research of the metering technology of the direct current power distribution network is continuously carried out. The traditional control and calibration method for the direct current transformer cannot meet the requirement of relevant regulations of field calibration and calibration tests of the direct current transformer on accuracy.
Disclosure of Invention
The invention aims to provide a step response detection system of a direct current transformer based on a steepening leading edge current source, which is suitable for detecting the step response of the direct current transformer and can simultaneously detect the direct current transformer with analog quantity output and digital quantity output. The detection system can comprehensively detect the direct current transformer, meets the requirements of relevant regulations of field calibration and calibration tests of the direct current transformer on accuracy, and avoids the influence caused by faults of the direct current transformer.
The invention adopts the following technical scheme:
a step response detection system of a direct current transformer based on a steeped leading edge current source comprises the steeped leading edge current source, an analog acquisition unit, a digital acquisition unit, an analog-to-digital conversion unit, a digital-to-analog conversion unit and a compatible analog quantity and digital quantity step characteristic tester; the steepening front-edge current source outputs a direct current step current signal to the analog acquisition unit and the direct current transformer to be detected; analog signals output by the tested direct current transformer are input into the analog acquisition unit and the analog-to-digital conversion unit, digital quantity signals output by the tested direct current transformer are input into the digital quantity acquisition unit and the digital-to-analog conversion unit, digital quantity signals output by the analog-to-digital conversion unit are input into the digital quantity acquisition unit, and analog signals output by the digital-to-analog conversion unit are input into the analog acquisition unit; the output signals of the analog acquisition unit and the digital acquisition unit are both connected to a compatible analog quantity and digital quantity step characteristic tester.
The steepening leading edge current source is a high-frequency series resonance rectification circuit and comprises a filter circuit, a rectification unit, a switch module unit and a series resonance circuit which are sequentially connected in series; the output rectifying unit is connected with the switch module unit through the sharpening leading edge control module; and the steepening leading edge control module receives the measured analog quantity voltage value fed back by the analog acquisition unit and regulates the conduction signal of the switch module.
The analog acquisition unit comprises a standard direct current comparator and an analog acquisition interface unit, wherein a signal of the standard direct current comparator is taken from a high-precision steepening front-edge current source and is converted into a measured analog voltage value, and the measured analog voltage value is fed back to the steepening front-edge control module; the analog signal of the tested direct current transformer and the analog signal converted by the digital-to-analog conversion unit are input into the analog acquisition unit and converted into a voltage signal, and then the voltage signal enters the compatible analog quantity and digital quantity step characteristic tester.
The digital quantity acquisition unit comprises a signal acquisition device, a signal synchronization device and a signal processing device; the signal acquisition device carries out synchronous sampling under the control of the signal synchronization device and inputs the output intermediate-frequency and low-frequency voltage small signals into the signal processing device.
The signal processing device comprises a low-pass filter, a band-pass filter, a clock synchronization module and a digital signal processing unit, wherein the clock synchronization module controls input signals to be synchronously filtered in the low-pass filter and the band-pass filter; the filtered signals are processed by the digital signal processing unit and then sent to a compatible analog quantity and digital quantity step characteristic tester.
The digital signal processing unit comprises signal extraction and signal interpolation, after point extraction and superposition are carried out on the filtered signals, the signals are interpolated by a zero interpolation algorithm to obtain processed digital signals, and the processed digital signals are sent to a compatible analog quantity and digital quantity step characteristic tester.
The analog-digital conversion unit comprises an input sampling channel and a signal acquisition device, wherein the input sampling channel consists of a zero-flux current transformer, a standard resistor and a voltage follower circuit, the zero-flux current transformer converts a measured direct current signal on a primary side into a direct current signal on a secondary side in proportion, the direct current signal on the secondary side is converted into a direct voltage signal through the standard resistor, the direct voltage signal is subjected to impedance matching and isolation through the voltage follower circuit, then is output to the signal acquisition device, and then is sent to a compatible analog quantity and digital quantity step characteristic tester.
The signal acquisition device consists of two A/D processing circuits with different frequency characteristics, the two A/D processing circuits are respectively connected with the input sampling channel to complete the conversion from an analog voltage signal to a digital signal, and the digital signal is sent to a compatible analog quantity and digital quantity step characteristic tester.
The digital-to-analog conversion unit comprises an input conversion circuit and a signal output device, wherein the input conversion circuit consists of a current output type D/A circuit; the signal output device is composed of a multi-path adjustable voltage stabilizing circuit and a voltage selection circuit, the voltage selection circuit is switched to corresponding voltage according to the tested current transformer to output, voltage signals output by the voltage stabilizing circuit are input into the analog acquisition unit, and the voltage signals are transmitted to the tester compatible with analog quantity and digital quantity step characteristics after passing through the analog acquisition unit.
The compatible analog quantity and digital quantity step characteristic tester comprises a control module, an analog quantity input module, a digital quantity input analysis module, a clock synchronization module and a step response characteristic test module; analog input module and digital input analysis module receive analog signal and digital signal respectively, clock synchronization module and control module, analog input module and digital input analysis module link to each other, the time scale of control data volume, control module handles the data that analog input sampling module and digital input analysis module provided, step response characteristic test module gathers the analog signal of analog input module output and carries out data simulation and show the result in real time through test software after through analog-to-digital conversion, step response characteristic test module carries out the data simulation and show the result in real time through test software after carrying out the filtering collection with the digital signal of digital input analysis module output.
The invention has the beneficial effects that:
1. the high-precision sharpening front-edge current source output has output ports and analog signal secondary output double feedback, and output direct current analog signals are input into the high-precision analog acquisition unit and the tested direct current transformer, so that the sharpening characteristic of output current is ensured, and the national standard requirement is met.
2. And step response detection of the independent analog quantity signal, outputting a direct current analog signal through the tested direct current transformer, inputting the direct current analog signal to the high-precision analog acquisition unit, and inputting the high-precision analog acquisition unit to the step characteristic tester.
3. And step response detection of the independent digital quantity signal, inputting the direct current analog signal to the analog-to-digital conversion unit, converting the analog signal to the digital quantity signal, or outputting the digital quantity signal through the tested direct current transformer, inputting the digital quantity signal to the digital quantity acquisition unit, and detecting the step characteristic of the digital quantity signal.
4. The tester compatible with the analog quantity and the digital quantity step characteristics comprises a control module, an analog quantity input module, a digital quantity input analysis module and a clock synchronization module. The analog input module and the digital input analysis module respectively receive the analog data quantity and the digital data quantity, the clock synchronization module is connected with the control module, the analog input module and the digital input analysis module, the time scale of the data quantity is controlled, and the control module processes the data provided by the analog input sampling module and the digital input analysis module and processes and displays the data through the test platform.
5. The analog-digital conversion unit is composed of a zero-flux current transformer, a standard resistor, a voltage follower circuit and a double A/D processing circuit, and the two A/D processing circuits are respectively connected with the input sampling channel.
6. The two types of signals are transmitted to the controller for processing through the digital quantity signals output by the high-precision sharpening front-edge current source, the analog acquisition unit and the analog-digital conversion unit and through the digital quantity signals output by the digital quantity acquisition unit and the digital-analog conversion unit, so that a relatively independent and uniform detection system is formed.
Drawings
FIG. 1 is a block diagram of the present invention.
Fig. 2 is a block diagram of the high precision steepening leading edge current source of the present invention.
Fig. 3 is a block diagram of the analog acquisition unit of the present invention.
Fig. 4 is a block diagram of an analog-to-digital conversion unit according to the present invention.
Fig. 5 is a block diagram of a digital-to-analog conversion unit according to the present invention.
Fig. 6 is a block diagram of the digital quantity acquisition unit according to the present invention.
FIG. 7 is a block diagram of the compatible analog and digital step characteristic tester according to the present invention.
Detailed Description
The embodiments of the present invention are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
With reference to fig. 1, a dc current transformer step response detection system based on a steeped leading edge current source comprises a steeped leading edge current source, an analog acquisition unit, a digital acquisition unit, an analog-to-digital conversion unit, a digital-to-analog conversion unit, and a compatible analog and digital step characteristic tester; the steepening front-edge current source outputs a direct current step current signal to the analog acquisition unit and the direct current transformer to be detected; analog signals output by the tested direct current transformer are input into the analog acquisition unit and the analog-to-digital conversion unit, digital quantity signals output by the tested direct current transformer are input into the digital quantity acquisition unit and the digital-to-analog conversion unit, digital quantity signals output by the analog-to-digital conversion unit are input into the digital quantity acquisition unit, and analog signals output by the digital-to-analog conversion unit are input into the analog acquisition unit; the output signals of the analog acquisition unit and the digital acquisition unit are both connected to a compatible analog quantity and digital quantity step characteristic tester.
As shown in fig. 2, the steepening leading-edge current source outputs a direct current for detection to provide a required current for the detected direct current transformer, and the steepening leading-edge current source is a high-frequency series resonance rectification circuit and comprises a filter circuit, a rectification unit, a switch module unit and a series resonance circuit which are sequentially connected in series; the output rectifying unit is connected with the switch module unit through the sharpening leading edge control module and provides control and driving signals based on a leading edge sharpening technology for the switch module unit; and the steepening leading edge control module receives the measured analog quantity voltage value fed back by the analog acquisition unit and regulates the conduction signal of the switch module.
The filter circuit in the sharpening front-edge current source performs low-pass filtering on the alternating current signal, consists of a three-phase LC circuit, and attenuates the working mode interference and the differential mode interference in the alternating current signal in a stop band; the rectifying unit converts the filtered alternating current electric energy into direct current electric energy and consists of a three-phase bridge rectifier; the switch module unit consists of an MOSFET switch unit and converts the electric energy after the rectification unit; the series resonance circuit is connected in series with the primary side of the high-frequency transformer by the LC to form a series resonance switch circuit; the output rectifying unit consists of an isolation diode and a freewheeling diode.
As shown in fig. 3, the analog acquisition unit acquires the analog current signal output by the high-precision steeped leading edge current source and the secondary of the dc current transformer to be tested, and is used for detecting the output signal of the high-precision steeped leading edge current source and feeding back the output signal to the high-precision steeped leading edge current source control unit to modulate the current output, and is used for acquiring the secondary signal of the dc current transformer to be tested to perform the step response test.
The analog acquisition unit comprises a standard direct current comparator and an analog acquisition interface unit, wherein the standard direct current comparator internally comprises a high-precision resistor, a signal of the standard direct current comparator is taken from a high-precision steep front-edge current source and is converted into a measured analog voltage value, and the measured analog voltage value is fed back to the steep front-edge control module and is used for adjusting the output response speed of the current source so as to meet the national standard output requirement; the analog signal of the tested direct current transformer and the analog signal converted by the digital-to-analog conversion unit are input into the analog acquisition unit and converted into a voltage signal, and then the voltage signal enters the compatible analog quantity and digital quantity step characteristic tester.
As shown in fig. 6, the digital quantity acquisition unit includes a signal acquisition device, a signal synchronization device and a signal processing device; the signal acquisition device carries out synchronous sampling under the control of the signal synchronization device and inputs the output intermediate-frequency and low-frequency voltage small signals into the signal processing device.
The signal processing device comprises a low-pass filter, a band-pass filter, a clock synchronization module and a digital signal processing unit, wherein the clock synchronization module controls input signals to be synchronously filtered in the low-pass filter and the band-pass filter; the filtered signals are processed by the digital signal processing unit and then sent to a compatible analog quantity and digital quantity step characteristic tester.
The digital signal processing unit comprises signal extraction and signal interpolation, after the filtered signals are subjected to point extraction and superposition, the signals are subjected to interpolation by a zero interpolation algorithm to obtain processed digital signals, and the processed digital signals are sent to a compatible analog quantity and digital quantity step characteristic tester.
As shown in fig. 4, the analog-to-digital conversion unit is configured to convert an analog signal, which is acquired and secondarily output by the dc transformer to be tested, into a digital signal, and send the digital signal to the analog-to-digital compatible step characteristic tester for digital step characteristic test, and includes an input sampling channel and a signal acquisition device, where the input sampling channel is composed of a zero-flux current transformer, a standard resistor, and a voltage follower circuit, the zero-flux current transformer proportionally converts a dc signal, which is to be tested, on a primary side to a dc signal on a secondary side, the dc signal on the secondary side is converted into a dc voltage signal through the standard resistor, and the dc voltage signal is impedance-matched and isolated by the voltage follower circuit, then output to the signal acquisition device, and then sent to the analog-to-compatible and digital compatible step characteristic tester.
The signal acquisition device consists of two A/D processing circuits with different frequency characteristics, the two A/D processing circuits are respectively connected with the input sampling channel to complete the conversion from the analog voltage signal to the digital quantity signal, and the digital signal is sent to the tester compatible with the analog quantity and digital quantity step characteristics.
As shown in fig. 5, the digital-to-analog conversion unit is configured to convert the acquired digital signal output by the tested dc transformer into an analog signal, and send the analog signal to a compatible analog quantity and digital quantity step characteristic tester for analog quantity step characteristic test, and includes an input conversion circuit and a signal output device, where the input conversion circuit is composed of a current output type D/a circuit; the signal output device is composed of a multi-path adjustable voltage stabilizing circuit and a voltage selection circuit, the voltage selection circuit is switched to corresponding voltage according to the tested current transformer to output, voltage signals output by the voltage stabilizing circuit are input into the analog acquisition unit, and the voltage signals are transmitted to the tester compatible with analog quantity and digital quantity step characteristics after passing through the analog acquisition unit.
As shown in fig. 7, the tester compatible with analog quantity and digital quantity step characteristics includes a control module, an analog quantity input module, a digital quantity input analysis module, a clock synchronization module, and a step response characteristic test module; analog input module and digital input analysis module receive analog signal and digital signal respectively, clock synchronization module and control module, analog input module and digital input analysis module link to each other, the time scale of control data volume, control module handles the data that analog input sampling module and digital input analysis module provided, step response characteristic test module gathers the analog signal of analog input module output and carries out data simulation and show the result in real time through test software after through analog-to-digital conversion, step response characteristic test module carries out the data simulation and show the result in real time through test software after carrying out the filtering collection with the digital signal of digital input analysis module output.
The specific detection method for the step response detection method of the direct current transformer by utilizing the invention is as follows:
1. and outputting a direct current step current signal for detection through the high-precision sharpening front-edge current source, and inputting the direct current step current signal to an analog acquisition unit and a detected direct current transformer.
2. And outputting a direct current step current signal through the tested direct current transformer, inputting the direct current step current signal to the analog acquisition unit, inputting the analog acquisition unit to a compatible analog quantity and digital quantity step characteristic tester, and carrying out step response test on the analog quantity signal.
3. The standard direct current step current signal is output through the steepening leading edge current source, the direct current step current signal is input to the analog-to-digital conversion unit, and the analog signal is converted into the digital signal.
4. And outputting a digital quantity signal through the tested direct current transformer, inputting the digital quantity signal into a digital quantity acquisition unit compatible with an analog quantity and digital quantity step characteristic tester, and carrying out step response test on the digital quantity signal.
5. The analog input module and the digital input analysis module respectively receive the analog data quantity and the digital data quantity, the clock synchronization module is connected with the control module, the analog input module and the digital input analysis module, the time scale of the data quantity is controlled, and the control module processes the data provided by the analog input sampling module and the digital input analysis module.
Claims (10)
1. A step response detection system of a direct current transformer based on a steeped leading edge current source is characterized by comprising the steeped leading edge current source, an analog acquisition unit, a digital quantity acquisition unit, an analog-to-digital conversion unit, a digital-to-analog conversion unit and a compatible analog quantity and digital quantity step characteristic tester; the steepening front-edge current source outputs a direct current step current signal to the analog acquisition unit and the direct current transformer to be detected; analog signals output by the tested direct current transformer are input into the analog acquisition unit and the analog-to-digital conversion unit, digital quantity signals output by the tested direct current transformer are input into the digital quantity acquisition unit and the digital-to-analog conversion unit, digital quantity signals output by the analog-to-digital conversion unit are input into the digital quantity acquisition unit, and analog signals output by the digital-to-analog conversion unit are input into the analog acquisition unit; the output signals of the analog acquisition unit and the digital acquisition unit are both connected to a compatible analog quantity and digital quantity step characteristic tester.
2. The steepened leading-edge current source-based direct current transformer step response detection system according to claim 1, wherein the steepened leading-edge current source is a high-frequency series resonant rectification circuit comprising a filter circuit, a rectification unit, a switch module unit and a series resonant circuit which are connected in series in sequence; the output rectifying unit is connected with the switch module unit through the sharpening leading edge control module; and the steepening leading edge control module receives the measured analog quantity voltage value fed back by the analog acquisition unit and regulates the conduction signal of the switch module.
3. The system for detecting the step response of the direct current transformer based on the steepened leading edge current source according to claim 2, wherein the analog acquisition unit comprises a standard direct current comparator and an analog acquisition interface unit, a signal of the standard direct current comparator is taken from the high-precision steepened leading edge current source and is converted into a measured analog voltage value, and the measured analog voltage value is fed back to the steepened leading edge control module; the analog signal of the tested direct current transformer and the analog signal converted by the digital-to-analog conversion unit are input into the analog acquisition unit and converted into a voltage signal, and then the voltage signal enters the compatible analog quantity and digital quantity step characteristic tester.
4. The steepened leading-edge current source-based direct current transformer step response detection system according to claim 3, wherein the digital quantity acquisition unit comprises a signal acquisition device, a signal synchronization device and a signal processing device; the signal acquisition device carries out synchronous sampling under the control of the signal synchronization device and inputs the output intermediate-frequency and low-frequency voltage small signals into the signal processing device.
5. The steepened leading edge current source-based direct current transformer step response detection system according to claim 4, wherein the signal processing device comprises a low pass filter, a band pass filter, a clock synchronization module and a digital signal processing unit, the clock synchronization module controls the input signal to be synchronously filtered in the low pass filter and the band pass filter; the filtered signals are processed by the digital signal processing unit and then sent to a compatible analog quantity and digital quantity step characteristic tester.
6. The steepened leading-edge current source-based direct current transformer step response detection system according to claim 5, wherein the digital signal processing unit comprises signal extraction and signal interpolation, filtered signals are subjected to point extraction and superposition, the signals are subjected to interpolation by a zero interpolation algorithm to obtain processed digital signals, and the processed digital signals are sent to a compatible analog quantity and digital quantity step characteristic tester.
7. The system according to claim 6, wherein the analog-to-digital conversion unit comprises an input sampling channel and a signal acquisition device, the input sampling channel comprises a zero-flux current transformer, a standard resistor and a voltage follower circuit, the zero-flux current transformer proportionally converts the measured direct current signal on the primary side into a direct current signal on the secondary side, the direct current signal on the secondary side is converted into a direct current voltage signal through the standard resistor, and the direct current voltage signal is subjected to impedance matching and isolation through the voltage follower circuit, then is output to the signal acquisition device and then is sent to the compatible analog quantity and digital quantity step characteristic tester.
8. The system according to claim 7, wherein the signal acquisition device comprises two a/D processing circuits with different frequency characteristics, the two a/D processing circuits are respectively connected to the input sampling channels, so as to complete conversion from the analog voltage signal to the digital signal, and the digital signal is sent to the tester compatible with the analog quantity and digital quantity step characteristics.
9. The steepened leading-edge current source-based step response detection system for a direct current transformer according to claim 8, wherein the digital-to-analog conversion unit comprises an input conversion circuit and a signal output device, the input conversion circuit is composed of a current output type D/A circuit; the signal output device is composed of a multi-path adjustable voltage stabilizing circuit and a voltage selection circuit, the voltage selection circuit is switched to corresponding voltage according to the tested current transformer to output, voltage signals output by the voltage stabilizing circuit are input into the analog acquisition unit, and the voltage signals are transmitted to the tester compatible with analog quantity and digital quantity step characteristics after passing through the analog acquisition unit.
10. The steepened leading-edge current source-based step response detection system for the direct current transformer of claim 9, wherein the compatible analog quantity and digital quantity step characteristic tester comprises a control module, an analog quantity input module, a digital quantity input analysis module, a clock synchronization module and a step response characteristic test module; analog input module and digital input analysis module receive analog signal and digital signal respectively, clock synchronization module and control module, analog input module and digital input analysis module link to each other, the time scale of control data volume, control module handles the data that analog input sampling module and digital input analysis module provided, step response characteristic test module gathers the analog signal of analog input module output and carries out data simulation and show the result in real time through test software after through analog-to-digital conversion, step response characteristic test module carries out the data simulation and show the result in real time through test software after carrying out the filtering collection with the digital signal of digital input analysis module output.
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