CN111679238B - System and method for testing broadband transmission characteristics of direct current transformer - Google Patents
System and method for testing broadband transmission characteristics of direct current transformer Download PDFInfo
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- CN111679238B CN111679238B CN202010547695.0A CN202010547695A CN111679238B CN 111679238 B CN111679238 B CN 111679238B CN 202010547695 A CN202010547695 A CN 202010547695A CN 111679238 B CN111679238 B CN 111679238B
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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
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
- G01S19/25—Acquisition or tracking or demodulation of signals transmitted by the system involving aiding data received from a cooperating element, e.g. assisted GPS
- G01S19/256—Acquisition or tracking or demodulation of signals transmitted by the system involving aiding data received from a cooperating element, e.g. assisted GPS relating to timing, e.g. time of week, code phase, timing offset
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Abstract
The invention discloses a system and a method for testing broadband transmission characteristics of a direct current transformer.A calculation control device in the system generates a standard digital signal based on an obtained test instruction, and converts the standard digital signal into a standard analog signal so as to enable the direct current transformer to be tested to generate an initial signal based on the standard analog signal; and the data acquisition device generates a target digital signal based on the initial signal and sends the target digital signal to the calculation control device, so that the calculation control device selects a digital signal to be tested corresponding to the received test instruction from the target digital signal, tests and calculates the digital signal to be tested and the standard digital signal, and obtains a test result of the test of the broadband transmission characteristic of the direct current transformer, so that the accurate test of the broadband transmission characteristic of the direct current transformer is completed, and a user can ensure the safe and stable operation of the converter station and the whole ultrahigh voltage direct current transmission system according to the test result.
Description
Technical Field
The invention relates to the technical field of direct current transformer testing, in particular to a system and a method for testing broadband transmission characteristics of a direct current transformer.
Background
In a wide region, the problems of power consumption dispersion, uneven distribution of power generation resources and power consumption conditions and the like exist in the power consumption condition, so that the realization of long-distance trans-regional safe and economic power transmission is one of the important directions of the national energy strategy. The ultra-high voltage direct current power transmission (UHVDC) technology has the characteristics of large transmission capacity, long transmission distance, capability of being used for asynchronous networking of a power system and the like, and becomes a main technical means for solving the problems.
Generally, an extra-high voltage direct current transmission technology is applied to an extra-high voltage direct current transmission system, and the extra-high voltage direct current transmission system is provided with a converter station to convert alternating current into direct current or convert direct current into alternating current, and ensure that the extra-high voltage direct current transmission system operates stably. However, the converter station is a harmonic source in the process of extra-high voltage direct current transmission, and a large amount of harmonic current can be generated. When the harmonic current component entering the ac power grid is too large, the loss of the generator and the capacitor is increased, which causes overheating of the generator and the capacitor, thereby affecting the stability of the converter station and causing the local generation of harmonic overvoltage in the power grid.
The direct current transformer is used as an important primary device in a converter station, and the broadband transmission characteristic of the direct current transformer is directly related to the safe and stable operation of the converter station and an extra-high voltage direct current transmission system, so that the accurate test of the broadband transmission characteristic of the direct current transformer becomes a problem to be solved urgently.
Disclosure of Invention
The technical problem to be solved by the invention is to accurately test the broadband transmission characteristic of the direct current transformer, so that a system and a method for testing the broadband transmission characteristic of the direct current transformer are provided, the broadband transmission characteristic of the direct current transformer is accurately tested, and the safe and stable operation of a converter station and the whole extra-high voltage direct current transmission system is ensured.
The invention is realized by the following technical scheme:
a direct current transformer broadband transmission characteristic test system comprises: the calculation control device and the data acquisition device;
the calculation control device is used for generating a standard digital signal based on the acquired test instruction and converting the standard digital signal into a standard analog signal; sending the standard analog signal to a direct current transformer to be tested so that the direct current transformer to be tested generates an initial signal based on the standard analog signal;
the data acquisition device is used for generating a target digital signal based on the starting signal;
the calculation control device is further configured to receive the target digital signals sent by the data acquisition device, select a digital signal to be tested corresponding to the received test instruction from the target digital signals, perform test calculation on the digital signal to be tested and the standard digital signal, and obtain a test result of the test of the broadband transmission characteristic of the direct current transformer.
Further, the computing control device comprises a human-computer interaction module, a data receiving module, a control module and a target output module;
the human-computer interaction module is used for acquiring a test instruction and sending the test instruction to the control module;
the control module is used for generating a standard digital signal based on a test instruction sent by the human-computer interaction module and sending the standard digital signal to the target output module;
the target output module is used for receiving the standard digital signal output by the control module and converting the standard digital signal into a standard analog signal; sending the standard analog signal to a direct current transformer to be tested so that the direct current transformer to be tested generates an initial signal based on the standard analog signal;
the data acquisition device is used for generating a target digital signal based on the starting signal;
the data receiving module is used for receiving the target digital signal sent by the data acquisition device and sending the target digital signal to the control module;
and the control module is used for selecting a corresponding digital signal to be tested from the target digital signals sent by the data receiving module based on the test instruction, carrying out test calculation on the digital signal to be tested and the standard digital signal, and obtaining a test result of the broadband transmission characteristic test of the direct current transformer.
Further, the control module comprises a digital signal processing unit, a first FPGA unit and a first frequency unit;
the digital signal processing unit is used for receiving a test instruction sent by the human-computer interaction unit, generating a standard digital signal based on the test instruction, and sending the test instruction and the standard digital signal to the first FPGA unit;
the first FPGA unit is used for receiving the test instruction and the standard digital signal and sending the test instruction and the standard digital signal to the target output module so that the target output module outputs a standard analog signal based on the test instruction and the standard digital signal;
the digital signal processing unit is used for selecting a digital signal to be tested from the target digital signals sent by the data receiving module based on the test instruction, carrying out test calculation on the standard digital signal and the digital signal to be tested, acquiring a test result and sending the test result to the man-machine interaction module for visual display;
the first frequency unit is used for providing a frequency reference for the first FPGA module.
Further, the control module further comprises a data storage unit;
the data storage unit is used for storing the test instruction, the standard digital signal, the target digital signal, the digital signal to be tested and the test result in the digital signal processing unit.
Further, the target output module includes: the digital-to-analog conversion unit, the channel switching unit and the channel output unit;
the digital-to-analog conversion unit is used for receiving the standard digital signal output by the control module, converting the standard digital signal into a corresponding alternating voltage signal and sending the alternating voltage signal to the channel switching unit;
the channel switching unit is used for receiving the test instruction output by the control module and the alternating voltage signal output by the digital-to-analog conversion unit, and selecting the corresponding channel switching unit according to the test instruction to send the alternating voltage signal to the channel output unit;
and the channel output unit is used for receiving the alternating voltage signal output by the channel switching unit, processing the alternating voltage signal to generate a standard analog signal and sending the standard analog signal to the direct current transformer to be tested.
Further, the channel output unit comprises a first channel output unit, a second channel output unit and a third channel output unit;
the first channel output unit comprises a first filtering unit, a PWM waveform generating unit, a first isolation driving unit, a switch power amplifier unit and a third filtering unit, the first filtering unit is connected with the PWM waveform generating unit, the PWM waveform generating unit is connected with the first isolation driving unit, the first isolation driving unit is connected with the switch power amplifier unit, and the switch power amplifier unit is respectively connected with the PWM waveform generating unit and the third filtering unit;
the second channel output unit comprises a second filtering unit, a second isolation driving unit and a power amplification unit, the second filtering unit is connected with the second isolation driving unit, the second isolation driving unit is connected with the power amplification unit, and the power amplification unit is connected with the second isolation driving unit;
the third channel output unit comprises a filtering and voltage reducing unit.
Further, the first filtering unit is configured to filter the ac voltage signal output by the channel switching unit, and output a first filtered signal; the PWM waveform generating unit is used for performing sine pulse width modulation on the first filtering signal and outputting a sine wave signal; the first isolation driving unit is used for isolating and enhancing the sine wave signal and outputting a first processing signal; the switch power amplification unit is used for converting the first processing signal into a large current; the third filtering unit is used for filtering the large current and outputting a first standard analog signal;
the second filtering unit is used for filtering the alternating voltage signal output by the channel switching unit and outputting a second filtering signal; the second isolation driving unit is used for isolating and enhancing the second filtering signal and outputting a second processing signal; and the power amplification unit is used for performing conversion processing on the second processing signal and outputting a second standard analog signal.
And the third channel output unit is used for carrying out voltage reduction processing on the alternating-current voltage signal output by the channel switching unit to obtain a third standard analog signal.
Further, the calculation control device further comprises a first Beidou receiving module and a first power supply module;
the first Beidou receiving module is used for receiving a Beidou satellite synchronous clock signal and outputting a pulse per second synchronous signal to the control module;
the first power supply module is used for supplying power to the human-computer interaction module, the data receiving module, the control module, the target output module and the first Beidou receiving module.
Further, the starting signal comprises an optical signal and an alternating voltage signal output by the direct current transformer to be tested;
the data acquisition device comprises a second frequency module, a second Beidou receiving module, a photoelectric conversion module, a voltage input module, a second FPGA module, a data output module and a second power module;
the second frequency module is used for providing a frequency reference for the second FPGA module;
the second Beidou receiving module is used for receiving a Beidou satellite synchronous clock signal and outputting a pulse per second synchronous signal to the second FPGA module;
the photoelectric conversion module is used for receiving the optical signal output by the direct current transformer to be tested and converting the optical signal output by the direct current transformer to be tested into a first target digital signal; sending the first target digital signal to the second FPGA module;
the voltage input module is used for receiving the alternating current voltage signal output by the direct current transformer to be tested and converting the alternating current voltage signal output by the direct current transformer to be tested into a second target digital signal; sending the second target digital signal to the second FPGA module;
the second FPGA module is used for completing time synchronization based on the pulse per second synchronization signal output by the second Beidou receiving module and acquiring a first target digital signal sent by the photoelectric conversion module and/or a second target digital signal sent by the voltage input module based on a frequency reference provided by the second frequency module;
the data output module is used for outputting the first target digital signal and/or the second target digital signal;
and the second power supply module is used for providing power supply voltage and supplying power to the second frequency module, the second Beidou receiving module, the photoelectric conversion module, the voltage input module, the second FPGA module and the data output module.
A method for testing broadband transmission characteristics of a direct current transformer comprises the following steps executed by a calculation control device:
acquiring a test instruction, generating a standard digital signal based on the test instruction, and converting the standard digital signal into a standard analog signal; sending the standard analog signal to a direct current transformer to be tested so that the direct current transformer to be tested generates an initial signal based on the standard analog signal;
and receiving a target digital signal generated by the data acquisition device based on the initial signal, selecting a digital signal to be tested corresponding to the received test instruction from the target digital signal, carrying out test calculation on the digital signal to be tested and the standard digital signal, and obtaining a test result of the broadband transmission characteristic test of the direct current transformer.
The invention relates to a system and a method for testing the broadband transmission characteristic of a direct current transformer.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic block diagram of a system for testing broadband transmission characteristics of a DC transformer according to the present invention;
FIG. 2 is another schematic block diagram of the broadband transmission characteristic testing system of the DC transformer of the present invention;
FIG. 3 is a view of an application of the testing method for broadband transmission characteristics of a DC current transformer according to the present invention;
fig. 4 is another application scenario diagram of the method for testing the broadband transmission characteristic of the dc current transformer according to the present invention;
fig. 5 is a flowchart of a method for testing the broadband transmission characteristic of the dc current transformer according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and the accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not used as limiting the present invention.
Example 1
As shown in fig. 1-2, the present invention provides a system for testing broadband transmission characteristics of a dc current transformer, comprising: the device comprises a calculation control device and a data acquisition device.
The calculation control device is used for generating a standard digital signal based on the acquired test instruction and converting the standard digital signal into a standard analog signal; and sending the standard analog signal to the direct current transformer to be tested so that the direct current transformer to be tested generates an initial signal based on the standard analog signal.
And the data acquisition device is used for generating a target digital signal based on the starting signal.
And the calculation control device is also used for receiving the target digital signals sent by the data acquisition device, selecting the digital signals to be tested corresponding to the received test instruction from the target digital signals, and performing test calculation on the digital signals to be tested and the standard digital signals to obtain the test result of the broadband transmission characteristic test of the direct current transformer.
The calculation control device is a device for calculating and controlling the data sent by the data acquisition device. The data acquisition device is used for acquiring optical signals and voltage signals output by the direct current transformer and converting the acquired optical signals and voltage signals into digital signals which can be identified by the computer control device.
The testing instruction refers to an instruction which is input by a user on the human-computer interaction device and used for testing the broadband transmission characteristic of the direct current transformer, and includes but is not limited to an instruction for testing the specific difference, the angular difference, the amplitude-frequency phase-frequency and the step response of the direct current transformer.
The standard digital signal refers to a digital signal set by a user, such as a large current of 0 to 1000A/frequency 50Hz, a high frequency current of 0 to 100A/frequency DC to 5kHz in amplitude, and an alternating voltage signal of 0 to 5V.
The standard analog signal refers to an analog signal obtained by performing digital-to-analog conversion on a standard digital signal. The direct current transformer to be tested refers to an active photoelectric direct current transformer or a zero-flux direct current transformer which needs to be tested for broadband transmission characteristics, and includes but is not limited to active photoelectric direct current transformers or zero-flux direct current transformers which adopt a shunt method, a saturable reactor type, a hall converter type and a direct current comparison principle. Specifically, if the current transformer is an active photoelectric dc current transformer, the system for testing the broadband transmission characteristic of the dc current transformer is shown in fig. 3. If the current transformer is a zero-flux dc current transformer, the system for testing the broadband transmission characteristics of the dc current transformer is shown in fig. 4.
The initial signal refers to a signal generated by the direct current transformer to be tested based on the standard analog signal. The initial signal in this embodiment includes an optical signal and an alternating voltage signal generated by the dc current transformer to be tested based on the standard analog signal.
The target digital signal is a digital signal in which the data acquisition means converts the start signal into a voltage form. The data acquisition device in this embodiment can be applied to corresponding equipment according to actual conditions, and the equipment can be determined as portable equipment (such as a tool kit for installing the data acquisition device) and a mobile terminal (such as a notebook computer, a tablet computer, a smart phone, and the like) according to actual conditions.
The digital signal to be tested refers to a target digital signal corresponding to the test instruction.
Furthermore, the data transmission mode between the calculation control device and the data acquisition device can be wireless transmission or wired transmission, and a user can determine the data transmission mode according to actual conditions.
The computing control device comprises a man-machine interaction module, a data receiving module, a control module and a target output module.
And the human-computer interaction module is used for acquiring the test instruction and sending the test instruction to the control module.
Specifically, a user inputs a corresponding test instruction on the human-computer interaction device, the human-computer interaction device sends the test instruction to the human-computer interaction module, and the human-computer interaction module sends the test instruction to the control module.
And the control module is used for generating a standard digital signal based on the test instruction sent by the man-machine interaction module and sending the standard digital signal to the target output module.
Specifically, a DSP unit (digital signal processing unit) arranged in the control module generates a standard digital signal based on a test instruction sent by the human-computer interaction module.
The target output module is used for receiving the standard digital signal output by the control module and converting the standard digital signal into a standard analog signal; and sending the standard analog signal to the direct current transformer to be tested so that the direct current transformer to be tested generates an initial signal based on the standard analog signal.
And the data acquisition device is used for generating a target digital signal based on the initial signal.
And the data receiving module is used for receiving the target digital signal sent by the data acquisition device and sending the target digital signal to the control module.
And the control module is used for selecting a corresponding digital signal to be tested from the target digital signals sent by the data receiving module based on the test instruction, performing test calculation on the digital signal to be tested and the standard digital signal, and acquiring a test result of the broadband transmission characteristic test of the direct current transformer.
Specifically, if the test instruction is an instruction for testing the ratio difference of the dc current transformer, the control module generates a corresponding standard digital signal based on the test instruction, and sends the standard digital signal to the corresponding target output module, so that the target output module outputs a corresponding standard analog signal. The target output module sends the standard analog signal to a direct current transformer to be tested, the direct current transformer to be tested generates an initial signal (an optical signal and/or an alternating voltage signal) after receiving the standard analog signal, converts the initial signal into a target digital signal and sends the target digital signal to the data receiving module, the control module selects a digital signal to be tested from the data receiving module based on a test instruction, and a test result, namely an amplitude variation ratio, of the digital signal to be tested and the standard digital signal is calculated.
Similarly, if the test instruction is an instruction for testing the angular difference of the direct current transformer, calculating the phase angular difference between the digital signal to be tested and the standard digital signal; if the test instruction is an instruction for testing the amplitude-frequency phase-frequency of the direct current transformer, calculating the amplitude-frequency phase-frequency values of the digital signal to be tested and the standard digital signal; and if the test instruction is an instruction for testing the step response of the direct current transformer, calculating the step response values of the digital signal to be tested and the standard digital signal.
Furthermore, after the test result of the broadband transmission characteristic test of the direct current transformer, the control module can also send the obtained test result of the broadband transmission characteristic test of the direct current transformer to the human-computer interaction module for visual display, so that a user can conveniently and visually and clearly know the test result.
Further, the control module comprises a digital signal processing unit, a first FPGA unit and a first frequency unit.
And the digital signal processing unit is used for receiving the test instruction sent by the human-computer interaction unit, generating a standard digital signal based on the test instruction, and sending the test instruction and the standard digital signal to the first FPGA unit.
In this embodiment, the digital signal processing unit employs a TMS320C2000 chip from TI (Texas Instruments ). The standard digital signal in this embodiment is current data in a standard Common format (Common format for transient data exchange for power systems).
And the first FPGA unit is used for receiving the test instruction and the standard digital signal and sending the test instruction and the standard digital signal to the target output module so that the target output module outputs a standard analog signal based on the test instruction and the standard digital signal.
The first FPGA unit refers to an FPGA unit in the computer control device, and the first FPGA unit in this embodiment adopts a Cyclone V-series chip of alterla corporation.
And the digital signal processing unit is used for selecting a digital signal to be tested from the target digital signals sent by the data receiving module based on the test instruction, performing test calculation on the standard digital signal and the digital signal to be tested, acquiring a test result and sending the test result to the man-machine interaction module for visual display.
And the first frequency unit is used for providing a frequency reference for the first FPGA module.
The first frequency unit refers to a frequency unit in the calculation control device, and a high-precision clock chip with the frequency of 50MHz is adopted in the first frequency unit in the embodiment.
Further, the control module also comprises a data storage unit.
The data storage unit in this embodiment is composed of 128Mbit SDRAM (Synchronous Dynamic Random Access Memory) and 256M SRAM (Static Random-Access Memory).
And the data storage unit is used for storing the test instruction, the standard digital signal, the target digital signal, the digital signal to be tested and the test result in the digital signal processing unit.
Specifically, the data storage unit stores the test instruction, the standard digital signal, the target digital signal, the digital signal to be tested and the test result in the digital signal processing unit, so that the digital signal processing unit acquires the required data from the data storage unit according to actual requirements.
Further, the target output module comprises a digital-to-analog conversion unit, a channel switching unit and a channel output unit.
And the digital-to-analog conversion unit is used for receiving the standard digital signal output by the control module, converting the standard digital signal into a corresponding alternating voltage signal and sending the alternating voltage signal to the channel switching unit.
The channel switching unit is a circuit for selecting the corresponding data channel to output an alternating voltage signal according to the test instruction.
And the channel switching unit is used for receiving the test instruction output by the control module and the alternating voltage signal output by the digital-to-analog conversion unit, and selecting the corresponding channel switching unit according to the test instruction to send the alternating voltage signal to the channel output unit.
Specifically, the channel switching unit is composed of a relay with one input and multiple outputs.
And the channel output unit is used for receiving the alternating voltage signal output by the channel switching unit, processing the alternating voltage signal to generate a standard analog signal and sending the standard analog signal to the direct current transformer to be tested.
Further, the channel output unit includes a first channel output unit, a second channel output unit, and a third channel output unit.
The first channel output unit comprises a first filtering unit, a PWM waveform generating unit, a first isolation driving unit, a switch power amplifier unit and a third filtering unit, the first filtering unit is connected with the PWM waveform generating unit, the PWM waveform generating unit is connected with the first isolation driving unit, the first isolation driving unit is connected with the switch power amplifier unit, and the switch power amplifier unit is respectively connected with the PWM waveform generating unit and the third filtering unit.
Further, the first filtering unit is configured to filter the ac voltage signal output by the channel switching unit and output a first filtered signal; the PWM waveform generating unit is used for performing sine pulse width modulation on the first filtering signal and outputting a sine wave signal; the first isolation driving unit is used for isolating and enhancing the sine wave signal and outputting a first processing signal; the switch power amplification unit is used for converting the first processing signal into large current; and the third filtering unit is used for filtering the large current and outputting a first standard analog signal.
Specifically, the first filtering unit is composed of a second-order passive filtering circuit with an upper limit cutoff frequency of 50Hz, and is used for filtering interference frequency generated by the channel switching unit. The PWM waveform generating unit is composed of a general integrated chip and an error amplifier and realizes the function of generating PWM (Pulse Width Modulation) waveform. The first isolation driving unit is composed of a universal optical coupling isolation chip, a universal level conversion chip and a universal integrated driving chip, and functions of isolating and enhancing PWM waves are achieved. The switch power amplifier unit is formed by connecting 10 groups of general power amplifiers in parallel, outputs 1000A alternating current with the frequency of 50Hz, and realizes the function of converting power supply voltage into large current according to PWM waveform. And the third filtering unit consists of a second-order passive filtering circuit with the upper limit cut-off frequency of 50Hz, filters the interference frequency generated by the isolation driving unit, and outputs a current signal with the frequency of DC to 100Hz and the amplitude of 0 to 1000A, namely the first standard analog signal.
The second channel output unit comprises a second filtering unit, a second isolation driving unit and a power amplification unit, the second filtering unit is connected with the second isolation driving unit, the second isolation driving unit is connected with the power amplification unit, and the power amplification unit is connected with the second isolation driving unit.
Further, the second filtering unit is configured to filter the ac voltage signal output by the channel switching unit and output a second filtered signal; the second isolation driving unit is used for isolating and enhancing the second filtering signal and outputting a second processing signal; and the power amplification unit is used for converting the second processing signal and outputting a second standard analog signal.
Specifically, the second filtering unit is composed of a second-order passive filtering circuit with an upper limit cutoff frequency of 5kHz, and is used for filtering interference frequency generated by the channel switching unit. And the second isolation driving unit consists of a general isolation amplifier chip and realizes isolation and enhancement of the alternating voltage signal. The power amplification unit consists of 30 MOS (Metal-Oxide-Semiconductor Field-Effect Transistor) tubes of 200A/100V and a low-temperature drift current-limiting resistor, so that an alternating voltage signal output by the second isolation driving unit is converted into a 100A alternating current signal, and a high-frequency current signal with the amplitude of 0-100A and the frequency of DC-5 kHz, namely a second standard analog signal, is output.
The third channel output unit comprises a filtering and voltage reducing unit.
Further, the third channel output unit is configured to perform voltage reduction processing on the alternating-current voltage signal output by the channel switching unit to obtain a third standard analog signal.
Specifically, the filtering and voltage-reducing unit is composed of a second-order passive filter circuit with an upper limit cut-off frequency of 1MHz and a voltage-reducing transformer with a transformation ratio of 2:1, and is used for filtering and reducing an alternating voltage signal (such as an alternating voltage signal of 0 to 10V) output by the channel switching unit and outputting a third standard analog signal, such as an alternating voltage signal with a frequency of DC to 1MHz and an amplitude of 0 to 5V, namely the third standard analog signal.
Further, the calculation control device further comprises a first Beidou receiving module and a first power supply module.
And the first Beidou receiving module is used for receiving the Beidou satellite synchronous clock signal and outputting a pulse per second synchronous signal to the control module.
Wherein, first big dipper receiving module indicates the big dipper receiving module among the calculation controlling means.
The first power module is used for supplying power to the man-machine interaction module, the data receiving module, the control module, the target output module and the first Beidou receiving module.
The first power supply module refers to a power supply module in the computer control device.
Further, the starting signal comprises an optical signal and an alternating voltage signal output by the direct current transformer to be tested.
The data acquisition device comprises a second frequency module, a second Beidou receiving module, a photoelectric conversion module, a voltage input module, a second FPGA module, a data output module and a second power module.
And the second frequency module is used for providing a frequency reference for the second FPGA module.
The second frequency module refers to a frequency module in the data acquisition device, and the second frequency unit in this embodiment adopts a high-precision clock chip with a frequency of 50 MHz.
And the second Beidou receiving module is used for receiving the Beidou satellite synchronous clock signal and outputting a second pulse synchronous signal to the second FPGA module.
The second Beidou receiving module is a Beidou receiving module in the data acquisition device.
The photoelectric conversion module is used for receiving an optical signal output by the direct current transformer to be tested and converting the optical signal output by the direct current transformer to be tested into a first target digital signal; and sending the first target digital signal to a second FPGA module.
Further, the photoelectric conversion module includes a photoelectric conversion chip, a physical layer and a medium access layer, and is configured to convert an optical signal output by the dc current transformer into a corresponding digital voltage signal, that is, a first target digital signal.
The voltage input module is used for receiving the alternating voltage signal output by the direct current transformer to be tested and converting the alternating voltage signal output by the direct current transformer to be tested into a second target digital signal; and sending the second target digital signal to a second FPGA module.
Further, the voltage input module includes a voltage protection chip, a second-order passive filter with a cut-off frequency of 5kHz, and an analog-to-digital conversion chip, and is configured to convert the ac signal output by the dc current transformer into a corresponding digital voltage signal, that is, a second target digital signal.
And the second FPGA module is used for finishing time synchronization based on the pulse per second synchronization signal output by the second Beidou receiving module and acquiring a first target digital signal sent by the photoelectric conversion module and/or a second target digital signal sent by the voltage input module based on the frequency reference provided by the second frequency module.
The second FPGA unit is an FPGA module in the data acquisition device, and the first FPGA unit in this embodiment is a Cyclone V-series chip of alterla corporation.
And the data output module is used for outputting the first target digital signal and/or the second target digital signal.
And the second power supply module is used for providing power supply voltage and supplying power to the second frequency module, the second Beidou receiving module, the photoelectric conversion module, the voltage input module, the second FPGA module and the data output module.
Specifically, the first power module and the second power module have the same circuit, and the first power module is taken as an example for description. The first power supply module comprises a first power supply unit, a second power supply unit, a third power supply unit and a fourth power supply unit.
The first power supply unit converts 380V mains supply into 48V direct-current voltage, 10V direct-current voltage, 5V direct-current voltage and 3.3V direct-current voltage, and the power supply capacity is 10 kW.
The first power supply unit specifically adopts 1 group of general AC-to-DC power supplies and 10 groups of parallel DC-to-DC voltage stabilization isolation power supplies which are connected in series to realize that 380V of mains supply is reduced into 310V and then converted into 48V of direct current voltage.
The second power supply unit specifically adopts a general DC-to-DC voltage stabilization isolation power supply to convert the DC voltage of 48V into the DC voltage of 10V.
The third power supply unit specifically adopts a linear power supply chip to convert 10V direct current voltage into 5V direct current voltage.
The fourth power supply unit is formed by linear power supply chips, and the purpose of converting 5V direct current voltage into 3.3V direct current voltage is achieved.
The invention provides a broadband transmission characteristic test system of a direct current transformer, a digital signal processing unit generates a standard digital signal through a test instruction and sends the test instruction and the standard digital signal to a first FPGA unit, the first FPGA unit sends the standard digital signal to a digital-to-analog conversion unit in a target output module and converts the standard digital signal into an alternating voltage signal, a channel output unit processes the obtained alternating voltage signal to obtain a standard analog signal and sends the standard analog signal to the direct current transformer to be tested, the direct current transformer to be tested generates a starting signal (namely an optical signal and/or an alternating voltage signal) based on the standard analog signal and sends the starting signal to a data acquisition device, the data acquisition device converts the starting signal into a target digital signal which can be identified by a calculation control device and sends the target digital signal to a data receiving module, the digital signal processing unit selects a corresponding digital signal to be tested from the target digital signal based on the test instruction, and performs corresponding specific difference, angular difference, amplitude-frequency-phase frequency or step response test calculation on the standard analog signal and the digital signal to be tested according to the test instruction to obtain a test result so as to complete accurate test on the broadband transmission characteristic of the direct current transformer, so that a user can ensure safe and stable operation of the converter station and the whole ultrahigh voltage direct current transmission system according to the test result.
Example 2
As shown in fig. 5, the difference between the present embodiment and embodiment 1 is that a method for testing broadband transmission characteristics of a dc current transformer includes the following steps performed by a computing control device:
s10: acquiring a test instruction, generating a standard digital signal based on the test instruction, and converting the standard digital signal into a standard analog signal; and sending the standard analog signal to the direct current transformer to be tested so that the direct current transformer to be tested generates an initial signal based on the standard analog signal.
S20: and the receiving data acquisition device selects a digital signal to be tested corresponding to the received test instruction from the target digital signal based on the target digital signal generated by the initial signal, tests and calculates the digital signal to be tested and the standard digital signal, and obtains a test result of the broadband transmission characteristic test of the direct current transformer.
Specifically, a target output module in the calculation control device sends a standard analog signal to the direct current transformer to be detected, the direct current transformer to be detected outputs a start signal based on the standard analog signal and sends the start signal to the data acquisition device, and the start signal comprises an optical signal and/or an alternating voltage signal output by the direct current transformer to be detected. The data acquisition device converts the received initial signal into a corresponding target digital signal, and the control module selects a digital signal to be tested from the target digital signal based on a test instruction, performs test calculation on the standard digital signal and the digital signal to be tested, and obtains a test result of the broadband transmission characteristic test of the direct current transformer.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (8)
1. A direct current transformer wide band transmission characteristic test system which is characterized by comprising: the calculation control device and the data acquisition device;
the calculation control device is used for generating a standard digital signal based on the acquired test instruction and converting the standard digital signal into a standard analog signal; sending the standard analog signal to a direct current transformer to be tested so that the direct current transformer to be tested generates an initial signal based on the standard analog signal;
the data acquisition device is used for generating a target digital signal based on the starting signal;
the calculation control device is further configured to receive a target digital signal sent by the data acquisition device, select a digital signal to be tested corresponding to the received test instruction from the target digital signal, perform test calculation on the digital signal to be tested and the standard digital signal, and obtain a test result of the test of the broadband transmission characteristic of the direct current transformer;
the computing control device comprises a human-computer interaction module, a data receiving module, a control module and a target output module;
the human-computer interaction module is used for acquiring a test instruction and sending the test instruction to the control module;
the control module is used for generating a standard digital signal based on a test instruction sent by the human-computer interaction module and sending the standard digital signal to the target output module;
the target output module is used for receiving the standard digital signal output by the control module and converting the standard digital signal into a standard analog signal; sending the standard analog signal to a direct current transformer to be tested so that the direct current transformer to be tested generates an initial signal based on the standard analog signal;
the data receiving module is used for receiving the target digital signal sent by the data acquisition device and sending the target digital signal to the control module;
the control module is used for selecting a corresponding digital signal to be tested from the target digital signals sent by the data receiving module based on the test instruction, carrying out test calculation on the digital signal to be tested and the standard digital signal, and obtaining a test result of the broadband transmission characteristic test of the direct current transformer;
the target output module comprises a digital-to-analog conversion unit, a channel switching unit and a channel output unit;
the digital-to-analog conversion unit is used for receiving the standard digital signal output by the control module, converting the standard digital signal into a corresponding alternating voltage signal and sending the alternating voltage signal to the channel switching unit;
the channel switching unit is used for receiving the test instruction output by the control module and the alternating voltage signal output by the digital-to-analog conversion unit, and selecting the corresponding channel switching unit according to the test instruction to send the alternating voltage signal to the channel output unit;
and the channel output unit is used for receiving the alternating voltage signal output by the channel switching unit, processing the alternating voltage signal to generate a standard analog signal and sending the standard analog signal to the direct current transformer to be tested.
2. The system for testing the broadband transmission characteristic of the direct current transformer according to claim 1, wherein the control module comprises a digital signal processing unit, a first FPGA unit and a first frequency unit;
the digital signal processing unit is used for receiving a test instruction sent by the human-computer interaction unit, generating a standard digital signal based on the test instruction, and sending the test instruction and the standard digital signal to the first FPGA unit;
the first FPGA unit is used for receiving the test instruction and the standard digital signal and sending the test instruction and the standard digital signal to the target output module so that the target output module outputs a standard analog signal based on the test instruction and the standard digital signal;
the digital signal processing unit is used for selecting a digital signal to be tested from the target digital signals sent by the data receiving module based on the test instruction, performing test calculation on the standard digital signal and the digital signal to be tested, acquiring a test result and sending the test result to the human-computer interaction module for visual display;
the first frequency unit is used for providing a frequency reference for the first FPGA module.
3. The system for testing the broadband transmission characteristic of the direct current transformer according to claim 1, wherein the control module further comprises a data storage unit;
the data storage unit is used for storing the test instruction, the standard digital signal, the target digital signal, the digital signal to be tested and the test result in the digital signal processing unit.
4. The system for testing the broadband transmission characteristic of the direct current transformer according to claim 1, wherein the channel output unit comprises a first channel output unit, a second channel output unit and a third channel output unit;
the first channel output unit comprises a first filtering unit, a PWM waveform generating unit, a first isolation driving unit, a switch power amplifier unit and a third filtering unit, the first filtering unit is connected with the PWM waveform generating unit, the PWM waveform generating unit is connected with the first isolation driving unit, the first isolation driving unit is connected with the switch power amplifier unit, and the switch power amplifier unit is respectively connected with the PWM waveform generating unit and the third filtering unit;
the second channel output unit comprises a second filtering unit, a second isolation driving unit and a power amplification unit, the second filtering unit is connected with the second isolation driving unit, the second isolation driving unit is connected with the power amplification unit, and the power amplification unit is connected with the second isolation driving unit;
the third channel output unit comprises a filtering and voltage reducing unit.
5. The system for testing the broadband transmission characteristic of a dc current transformer according to claim 4, wherein the first filtering unit is configured to filter the ac voltage signal output by the channel switching unit to output a first filtered signal; the PWM waveform generating unit is used for performing sine pulse width modulation on the first filtering signal and outputting a sine wave signal; the first isolation driving unit is used for carrying out isolation and enhancement processing on the sine wave signal and outputting a first processing signal; the switch power amplification unit is used for converting the first processing signal into a large current; the third filtering unit is used for filtering the large current and outputting a first standard analog signal;
the second filtering unit is used for filtering the alternating voltage signal output by the channel switching unit and outputting a second filtering signal; the second isolation driving unit is used for isolating and enhancing the second filtering signal and outputting a second processing signal; the power amplifying unit is used for performing conversion processing on the second processing signal and outputting a second standard analog signal;
and the third channel output unit is used for carrying out voltage reduction processing on the alternating-current voltage signal output by the channel switching unit to obtain a third standard analog signal.
6. The system for testing the broadband transmission characteristic of the direct current transformer according to claim 1, wherein the computing and controlling device further comprises a first Beidou receiving module and a first power supply module;
the first Beidou receiving module is used for receiving a Beidou satellite synchronous clock signal and outputting a pulse per second synchronous signal to the control module;
the first power supply module is used for supplying power to the human-computer interaction module, the data receiving module, the control module, the target output module and the first Beidou receiving module.
7. The system for testing the broadband transmission characteristic of the direct current transformer according to claim 1, wherein the start signal comprises an optical signal and an alternating voltage signal output by the direct current transformer to be tested;
the data acquisition device comprises a second frequency module, a second Beidou receiving module, a photoelectric conversion module, a voltage input module, a second FPGA module, a data output module and a second power module;
the second frequency module is used for providing a frequency reference for the second FPGA module;
the second Beidou receiving module is used for receiving a Beidou satellite synchronous clock signal and outputting a pulse per second synchronous signal to the second FPGA module;
the photoelectric conversion module is used for receiving the optical signal output by the direct current transformer to be tested and converting the optical signal output by the direct current transformer to be tested into a first target digital signal; sending the first target digital signal to the second FPGA module;
the voltage input module is used for receiving the alternating current voltage signal output by the direct current transformer to be tested and converting the alternating current voltage signal output by the direct current transformer to be tested into a second target digital signal; sending the second target digital signal to the second FPGA module;
the second FPGA module is used for completing time synchronization based on the pulse per second synchronization signal output by the second Beidou receiving module and acquiring a first target digital signal sent by the photoelectric conversion module and/or a second target digital signal sent by the voltage input module based on a frequency reference provided by the second frequency module;
the data output module is used for outputting the first target digital signal and/or the second target digital signal;
and the second power supply module is used for providing power supply voltage and supplying power to the second frequency module, the second Beidou receiving module, the photoelectric conversion module, the voltage input module, the second FPGA module and the data output module.
8. A method for testing broadband transmission characteristics of a direct current transformer is characterized by comprising the following steps executed by a calculation control device:
acquiring a test instruction, generating a standard digital signal based on the test instruction, and converting the standard digital signal into a standard analog signal; sending the standard analog signal to a direct current transformer to be tested so that the direct current transformer to be tested generates an initial signal based on the standard analog signal;
receiving a target digital signal generated by a data acquisition device based on the initial signal, selecting a digital signal to be tested corresponding to a received test instruction from the target digital signal, and performing test calculation on the digital signal to be tested and the standard digital signal to obtain a test result of the broadband transmission characteristic test of the direct current transformer;
acquiring a test instruction and sending the test instruction to a control module; the control module generates a standard digital signal based on a test instruction sent by the human-computer interaction module and sends the standard digital signal to the target output module; the target output module receives the standard digital signal output by the control module and converts the standard digital signal into a standard analog signal; sending the standard analog signal to a direct current transformer to be tested so that the direct current transformer to be tested generates an initial signal based on the standard analog signal; the data receiving module receives the target digital signal sent by the data acquisition device and sends the target digital signal to the control module; the control module selects a corresponding digital signal to be tested from the target digital signals sent by the data receiving module based on the test instruction, tests and calculates the digital signal to be tested and the standard digital signal, and obtains a test result of the broadband transmission characteristic test of the direct current transformer;
the digital-to-analog conversion unit receives a standard digital signal output by the control module, converts the standard digital signal into a corresponding alternating voltage signal and sends the alternating voltage signal to the channel switching unit; the channel switching unit receives a test instruction output by the control module and the alternating voltage signal output by the digital-to-analog conversion unit, and selects a corresponding channel switching unit according to the test instruction to send the alternating voltage signal to the channel output unit; and the channel output unit receives the alternating voltage signal output by the channel switching unit, processes the alternating voltage signal to generate a standard analog signal and sends the standard analog signal to the direct current transformer to be tested.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2777569Y (en) * | 2005-01-26 | 2006-05-03 | 江苏省电力公司南京供电公司 | Digital current transformer character integrated measurer |
| CN102944861A (en) * | 2012-11-06 | 2013-02-27 | 中国电力科学研究院 | Electronic transformer calibrator calibration device and method based on digital source |
| CN103837852A (en) * | 2013-09-23 | 2014-06-04 | 国家电网公司 | All-fiber electronic current transformer frequency characteristic testing device and testing method |
| CN105467351A (en) * | 2016-01-18 | 2016-04-06 | 云南电网有限责任公司电力科学研究院 | Electronic mutual inductor frequency response test method and system |
| CN107861087A (en) * | 2017-12-07 | 2018-03-30 | 广东电网有限责任公司电力科学研究院 | A kind of closed loop test system of direct current instrument transformer |
| CN108872921A (en) * | 2018-07-31 | 2018-11-23 | 中国电力科学研究院有限公司 | Device and method for verifying broadband characteristics of direct current transformer |
| CN108919163A (en) * | 2018-05-25 | 2018-11-30 | 云南电网有限责任公司电力科学研究院 | Electronic current mutual inductor harmonic wave and frequency aliasing characteristic test system and its model |
| CN110426667A (en) * | 2019-06-17 | 2019-11-08 | 中国电力科学研究院有限公司 | A kind of system and method for all-fiber current transformator progress wideband verification |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102967842B (en) * | 2012-10-24 | 2014-11-05 | 重庆大学 | Method for on-line diagnosing gradually-changing fault of electronic current transformers |
-
2020
- 2020-06-16 CN CN202010547695.0A patent/CN111679238B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2777569Y (en) * | 2005-01-26 | 2006-05-03 | 江苏省电力公司南京供电公司 | Digital current transformer character integrated measurer |
| CN102944861A (en) * | 2012-11-06 | 2013-02-27 | 中国电力科学研究院 | Electronic transformer calibrator calibration device and method based on digital source |
| CN103837852A (en) * | 2013-09-23 | 2014-06-04 | 国家电网公司 | All-fiber electronic current transformer frequency characteristic testing device and testing method |
| CN105467351A (en) * | 2016-01-18 | 2016-04-06 | 云南电网有限责任公司电力科学研究院 | Electronic mutual inductor frequency response test method and system |
| CN107861087A (en) * | 2017-12-07 | 2018-03-30 | 广东电网有限责任公司电力科学研究院 | A kind of closed loop test system of direct current instrument transformer |
| CN108919163A (en) * | 2018-05-25 | 2018-11-30 | 云南电网有限责任公司电力科学研究院 | Electronic current mutual inductor harmonic wave and frequency aliasing characteristic test system and its model |
| CN108872921A (en) * | 2018-07-31 | 2018-11-23 | 中国电力科学研究院有限公司 | Device and method for verifying broadband characteristics of direct current transformer |
| CN110426667A (en) * | 2019-06-17 | 2019-11-08 | 中国电力科学研究院有限公司 | A kind of system and method for all-fiber current transformator progress wideband verification |
Non-Patent Citations (3)
| Title |
|---|
| Design and validation of broadband calibration system for fiber-optical current transformers;Yu Jicheng;《Journal of Physics: Conference Series》;20190930;1-6 * |
| 直流光纤电流互感器宽频测量特性;李传生;《电力***自动化》;20170829;第41卷(第20期);151-155 * |
| 闭环全光纤电流互感器相位差的计算与测试;张朝阳;《仪器仪表学报》;20090115;第30卷(第1期);152-155 * |
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