CN115113608A - Return pulse width measuring device of high-voltage direct-current transmission converter valve thyristor control unit - Google Patents

Return pulse width measuring device of high-voltage direct-current transmission converter valve thyristor control unit Download PDF

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Publication number
CN115113608A
CN115113608A CN202210722308.1A CN202210722308A CN115113608A CN 115113608 A CN115113608 A CN 115113608A CN 202210722308 A CN202210722308 A CN 202210722308A CN 115113608 A CN115113608 A CN 115113608A
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CN
China
Prior art keywords
tcu
signal
voltage
converter valve
width
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CN202210722308.1A
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Chinese (zh)
Inventor
王潇
马元社
孙小平
崔斌
张娟
杨山河
周梦琦
王小强
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China XD Electric Co Ltd
Xian XD Power Systems Co Ltd
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China XD Electric Co Ltd
Xian XD Power Systems Co Ltd
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Application filed by China XD Electric Co Ltd, Xian XD Power Systems Co Ltd filed Critical China XD Electric Co Ltd
Priority to CN202210722308.1A priority Critical patent/CN115113608A/en
Publication of CN115113608A publication Critical patent/CN115113608A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B23/00—Testing or monitoring of control systems or parts thereof
    • G05B23/02—Electric testing or monitoring
    • G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/02—Measuring characteristics of individual pulses, e.g. deviation from pulse flatness, rise time or duration
    • G01R29/023—Measuring pulse width
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Power Conversion In General (AREA)

Abstract

The invention discloses a device for measuring the return pulse width of a thyristor control unit of a high-voltage direct-current transmission converter valve, which comprises: a control device and a measuring device; the control device and the measuring device are respectively connected with a Thyristor Control Unit (TCU) of the converter valve; the control device is used for: simulating a converter valve state, and sending an IP signal by the TCU based on the state; the measuring device is used for: the IP signal width is measured. The invention can automatically measure the width of the IP signal, judge whether the width of the IP signal is obviously reduced or not, and facilitate the maintainer to find the TCU board card with larger optical power attenuation before the board card fails, thereby eliminating the potential safety hazard.

Description

High-voltage direct-current transmission converter valve thyristor control unit return pulse width measuring device
Technical Field
The invention relates to the technical field of high-voltage direct-current transmission, in particular to a return pulse width measuring device of a thyristor control unit of a high-voltage direct-current transmission converter valve.
Background
This section is intended to provide a background or context to the embodiments of the invention that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.
In the high-voltage direct-current transmission system, a thyristor Control unit tcu (thyristor Control unit) continuously monitors the state of the converter valve, converts the state information into optical signals (hereinafter referred to as IP signals) and sends the optical signals to the valve Control through optical cables with different widths, and the valve Control determines the state of the thyristor according to the optical signals. The converter valve is a key device of the high-voltage direct-current transmission system, the valve control system is a control and monitoring device of the converter valve, and stable and reliable operation of the valve control system is guarantee of stable operation of the converter valve.
Because the TCU board card is installed on the converter valve, the current of the converter valve can reach thousands of amperes during operation, and a large magnetic field exists around the board card. For the reliability of the TCU board, the circuits on the board are almost all built by analog circuits without any logic devices, which results in that the IP signal sent by the TCU is not a regular square wave signal, so the transmission power of the optical transmitting tube directly affects the pulse width of the IP signal received by the valve control. If the board card is used for a long time, the power of the light emitting tube is gradually reduced, the width of an IP signal is reduced, finally, the valve control cannot accurately identify the IP signal, the valve control possibly mistakenly sends a fault alarm to cause tripping of the converter valve, and serious economic loss is caused.
Although the existing tester can test the full function of the thyristor control unit, the pulse width cannot be measured, so that the TCU cannot be detected before the power of the light emitting tube is completely reduced, and if the power of the light emitting tube is completely reduced, the valve control cannot accurately judge the state of the converter valve, so that the converter valve is tripped due to false alarm.
Disclosure of Invention
The embodiment of the invention provides a device for measuring the return pulse width of a thyristor control unit of a high-voltage direct-current transmission converter valve, which is used for solving the problem that the pulse width of a transmitted signal is narrowed but cannot be measured due to power reduction caused by aging of an optical device after a TCU runs for a long time, and comprises the following steps: a control device and a measuring device; the control device and the measuring device are respectively connected with a Thyristor Control Unit (TCU) of the converter valve;
the control device is used for: simulating a converter valve state, and sending an IP signal by the TCU based on the state;
the measuring device is used for: the IP signal width is measured.
In the embodiment of the invention, compared with the technical scheme that only the full function of the thyristor control unit is tested but the pulse width is not measured in the prior art, the invention can judge whether the IP signal width is obviously reduced or not by using the control device and the measuring device, simulating the state of the converter valve by using the control device and measuring the IP signal width by using the measuring loop, and is convenient for maintainers to find the TCU board card with larger optical power attenuation before the board card fails, thereby eliminating the potential safety hazard.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts. In the drawings:
FIG. 1 is a schematic connection diagram of a reported pulse width measurement device of a thyristor control unit of a high-voltage direct-current transmission converter valve according to an embodiment of the invention;
FIG. 2 is a schematic diagram of the connection of a control device according to an embodiment of the present invention;
FIG. 3 is a graph of voltage waveforms at points T and Y in an embodiment of the present invention;
fig. 4 is a schematic connection diagram of a measuring apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
In the prior art, the TCU sends the state of the converter valve to the valve control through an IP signal, different IP signal widths represent different states, but the optical power of the optical emitting device is gradually reduced after the optical emitting device is used for a long time, the width of the IP signal received by the valve control is reduced, and finally the valve control cannot correctly judge the state of the converter valve so as to mistakenly send a fault alarm to cause the converter valve to trip. Because thyristor control unit testing arrangement all can't measure the width of IP signal now, so need design one kind and can make TCU send all kinds of IP signals under the low-voltage to measure its width, can compare with the measuring result of the integrated circuit board of last same number simultaneously, make things convenient for the maintainer to discover the great TCU integrated circuit board of luminous power decay before the integrated circuit board trouble, thereby eliminate the potential safety hazard.
Based on this, the present invention provides a reporting pulse width measurement device for a thyristor control unit of a high voltage direct current transmission converter valve, as shown in fig. 1, the reporting pulse width measurement device includes: a control device and a measuring device; the control device and the measuring device are respectively connected with a Thyristor Control Unit (TCU) of the converter valve;
the control device is used for: simulating a converter valve state, and sending an IP signal by the TCU based on the state;
the measuring device is used for: the IP signal width is measured.
In one embodiment, the rewarding pulse width measurement means may further comprise: a power switch for turning on and off the reported pulse width measurement device (not shown in fig. 1).
In one embodiment, the control device can be connected to 220V commercial power, the output voltage does not exceed 220V, high voltage is not generated, and the output end can provide proper voltage output to make the TCU send all kinds of IP signals.
In one embodiment, the control device is further configured to: power the TCU and/or the measurement device.
In one embodiment, the measurement device is further configured to: and recording the IP signal width, comparing the IP signal width measured at the current time with the IP signal width measured at the last time, and judging whether the TCU has a fault or not based on the comparison result.
The whole device is simple and convenient to operate, and the device can automatically carry out measurement and data storage only by turning on a power switch.
In one embodiment, as shown in fig. 2, the control means may comprise an isolation transformer and a low voltage damping loop; the isolation transformer is connected with the TCU through a low-voltage damping loop;
the isolation transformer is used for: and outputting the alternating voltage to the TCU through a low-voltage damping circuit, and judging the state of the converter valve by the TCU based on the alternating voltage.
Specifically, the isolation transformer outputs alternating-current voltage to the low-voltage damping circuit, the low-voltage damping circuit is connected with the TCU, and when the voltage of the point T changes, the TCU considers that the state of the converter valve changes, so that IP signals with different widths are sent.
In one embodiment, as shown in FIG. 2, the low voltage damping loop includes a sampling resistor R dc Damping capacitor C S And a damping resistor R S (ii) a One end of the sampling resistor is connected with one end of the damping capacitor and is connected with the control device (L), and the other end of the sampling resistor is connected with one end T of the state sampling circuit of the TCU; another of the damping capacitorsOne end of the damping resistor is connected with one end of the damping resistor, and the other end of the damping resistor is connected with one end Y of the charging circuit of the TCU; and the other end N of the TCU state sampling circuit and the other end N of the TCU charging circuit are connected with the control device.
Specifically, TCU is detected by detecting U dc The state of the converter valve is determined by the voltage of the voltage divider, and the principle is as shown in fig. 2, when the output voltage of the isolation transformer changes, the voltage U of the internal voltage divider dc The TCU will be in a different U at the beginning of the change dc IP signals of different widths are transmitted at the voltage. As the state sampling circuit of the TCU is a pure resistive circuit, only R is needed dc The resistance value of the reverse overvoltage protection circuit is small enough to enable the forward overvoltage protection return IP signal which originally needs 8500V to be generated only needing 220V.
C S And R S The damping capacitor and the damping resistor are responsible for charging the TCU. Due to the existence of C S Will make the Y point voltage U Y And T point voltage U T The phases differ by 90 deg., as shown in fig. 3. Thus, the voltage U can be ensured T In the negative direction U Y If the voltage is positive, the TCU can start charging, so that sufficient voltage is ensured before the TCU sends the first IP signal, and the width of the sent IP signal is ensured not to be reduced due to insufficient voltage.
In one embodiment, as shown in fig. 2, the control device may further include an AC/DC unit connected to the measuring device;
the AC/DC unit is configured to: the 220V alternating current commercial power is converted into a 24V direct current power supply to supply power for the measuring device.
In one embodiment, as shown in FIG. 4, the measurement device includes a photoelectric conversion circuit and a Logic (Logic) circuit; the photoelectric conversion circuit is connected with the logic circuit;
wherein the photoelectric conversion circuit is configured to: converting the IP signal into an electric signal and converting the electric signal into a square wave signal;
the logic circuitry is to: an IP signal width is determined based on the square wave signal.
As shown in fig. 4, the measuring apparatus further includes a data recording module, connected to the logic circuit, for recording and storing the IP signal width, comparing the IP signal width measured at the current time with the IP signal width measured at the last time, and determining whether the TCU has a fault based on the comparison result.
As shown in fig. 4, the photoelectric conversion circuit includes an optical receiver and a voltage comparator; after receiving the light, the optical receiver will generate a fixed current, which is converted into a voltage signal through a resistor and then input into the "+" terminal of the voltage comparator. If the + terminal voltage is greater than the-terminal voltage U ref (U ref Can be obtained by dividing a 24V direct current voltage or directly used by a self-contained U ref Voltage comparator) then the comparator will output a square wave signal, the width of which is the width of the IP signal.
The optical receiver is configured to: converting the IP signal into an electrical signal;
the voltage comparator is configured to: the electrical signal is converted into a square wave signal.
Specifically, the photoelectric conversion circuit is consistent with the circuit in the valve control, and the pulse width of the same IP signal received by the measuring device and the valve control is ensured to be consistent.
The data logging module can record the number (human input) and the measurement result of the tested TCU.
In the embodiment of the invention, compared with the technical scheme that only the full function of the thyristor control unit is tested but the pulse width is not measured in the prior art, the invention has the following beneficial effects that the converter valve state is simulated by the control device and the measuring device through the control device, and the IP signal width is measured by the measuring loop:
(1) the device for measuring the return pulse width has the advantages of no high-voltage equipment, small volume, light weight and simple and convenient use, and can be used for testing by 1 person.
(2) The reporting pulse width measurement can test the TCU single board and can also test the installed TCU on the converter valve on the engineering site without disconnecting.
(3) The reporting pulse width measuring device can automatically record the measuring result and compare the measuring result with the last measuring record of the TCU with the same number, visually display whether the IP signal of the TCU is obviously reduced, and facilitate the maintainer to find the TCU board card with larger optical power attenuation before the board card is in fault, thereby eliminating potential safety hazard.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention 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 invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. 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.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. A device for measuring the return pulse width of a thyristor control unit of a high-voltage direct-current transmission converter valve is characterized by comprising: a control device and a measuring device; the control device and the measuring device are respectively connected with a Thyristor Control Unit (TCU) of the converter valve;
the control device is used for: simulating a converter valve state, and sending an IP signal by the TCU based on the state;
the measuring device is used for: the IP signal width is measured.
2. The apparatus according to claim 1, wherein the control apparatus is further configured to: power the TCU and/or the measurement device.
3. The apparatus according to claim 1, wherein the apparatus is further configured to: and recording the IP signal width, comparing the IP signal width measured at the current time with the IP signal width measured at the last time, and judging whether the TCU has a fault or not based on the comparison result.
4. The apparatus according to claim 1, further comprising: and the power switch is used for switching on and off the reporting pulse width measuring device.
5. The apparatus according to claim 1, wherein the control means comprises an isolation transformer and a low voltage damping loop; the isolation transformer is connected with the TCU through a low-voltage damping loop;
the isolation transformer is used for: and outputting the alternating voltage to the TCU through a low-voltage damping circuit, and judging the state of the converter valve by the TCU based on the alternating voltage.
6. The apparatus according to claim 5, wherein the low voltage damping loop comprises a sampling resistor, a damping capacitor and a damping resistor; one end of the sampling resistor is connected with one end of the damping capacitor and is connected with the control device, and the other end of the sampling resistor is connected with one end of the state sampling circuit of the TCU; the other end of the damping capacitor is connected with one end of a damping resistor, and the other end of the damping resistor is connected with one end of a charging circuit of the TCU; the other end of the TCU state sampling circuit and the other end of the TCU charging circuit are connected with the control device.
7. The apparatus according to claim 5, further comprising an AC/DC unit connected to the measuring means;
the AC/DC unit is configured to: the 220V alternating current commercial power is converted into a 24V direct current power supply to supply power for the measuring device.
8. The apparatus according to claim 1, wherein the apparatus comprises a photoelectric conversion circuit and a logic circuit; the photoelectric conversion circuit is connected with the logic circuit;
wherein the photoelectric conversion circuit is configured to: converting the IP signal into an electric signal and converting the electric signal into a square wave signal;
the logic circuitry is to: an IP signal width is determined based on the square wave signal.
9. The apparatus according to claim 8, further comprising a data recording module, connected to the logic circuit, for recording the IP signal width, comparing the current IP signal width with the last IP signal width, and determining whether the TCU has a fault based on the comparison result.
10. The apparatus according to claim 8, wherein the photoelectric conversion circuit comprises an optical receiver and a voltage comparator; the optical receiver is connected with the voltage comparator;
the optical receiver is configured to: converting the IP signal into an electrical signal;
the voltage comparator is configured to: the electrical signal is converted into a square wave signal.
CN202210722308.1A 2022-06-24 2022-06-24 Return pulse width measuring device of high-voltage direct-current transmission converter valve thyristor control unit Pending CN115113608A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210722308.1A CN115113608A (en) 2022-06-24 2022-06-24 Return pulse width measuring device of high-voltage direct-current transmission converter valve thyristor control unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210722308.1A CN115113608A (en) 2022-06-24 2022-06-24 Return pulse width measuring device of high-voltage direct-current transmission converter valve thyristor control unit

Publications (1)

Publication Number Publication Date
CN115113608A true CN115113608A (en) 2022-09-27

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210722308.1A Pending CN115113608A (en) 2022-06-24 2022-06-24 Return pulse width measuring device of high-voltage direct-current transmission converter valve thyristor control unit

Country Status (1)

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CN (1) CN115113608A (en)

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