CN117031234A - Converter valve thyristor level testing device, method and medium - Google Patents
Converter valve thyristor level testing device, method and medium Download PDFInfo
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- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/26—Testing of individual semiconductor devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a converter valve thyristor test device, a method and a medium, belonging to the technical field of converter valve test, wherein the method comprises the following steps: the signal output module outputs a low-voltage test signal, and the valve base electronic equipment replies a low-voltage test return signal; the processor records the return signal and controls the signal output module to continuously adjust the low-voltage test signal; the control board sends a corresponding low-voltage test return signal, the processor records the return signal and compares the return signal with a database to determine a technical route, and closed loop test is carried out; after the number of the low-voltage test signals reaches a first preset number, the processor controls the switch K 1 And switch K 2 Switching from an OFF position to an ON position, and outputting a single pulse impedance test signal by a signal source; the control board of the thyristor level sends a single pulse return signal to the processor, and the A/D module collects voltage signals of a second preset number of the impedance detection modules and calculates the impedance value of the thyristor level; the test system solves the problem that the existing test system needs to be independently subjected to low-voltage test and impedance test.
Description
Technical Field
The invention belongs to the technical field of converter valve testing, and particularly relates to a method for testing a thyristor of a converter valve.
Background
The converter valve is core equipment of direct current transmission engineering, and the three-phase alternating voltage is connected to a direct current end in sequence to obtain expected direct current voltage and control power. The converter valve is composed of parts such as thyristors, damping capacitors, equalizing capacitors, damping resistors, equalizing resistors, saturation reactors, thyristor control units and the like, wherein the thyristors are core parts of the converter valve, the through-flow capacity of the converter valve is determined, and a plurality of thyristor elements are connected in series to obtain a desired system voltage. The triggering modes of the thyristors are classified into electric triggering and optical triggering. The thyristor is also called as a silicon controlled rectifier (Silicon Controlled Rectifier), is called SCR for short, and is a high-power electrical element. It has the advantages of small volume, high efficiency, long service life, etc. In an automatic control system, the device can be used as a high-power driving device to control high-power equipment by using a low-power control. The method is widely applied to an AC/DC motor speed regulation system, a power regulation system and a follow-up system. The unidirectional thyristor is composed of four layers of semiconductor materials, and is provided with three PN junctions and three electrodes. In the power transmission engineering, the multi-stage thyristors of the converter valve are required to be tested. Previous converter valve thyristor test equipment required one experiment to be completed for thyristor test. The control board of the thyristor-level loop of the converter valve starts to take energy when the test voltage exceeds 36V. During the power-up process, the impedance value of the thyristor-level loop is unstable. Therefore, the existing test mode adopts low-voltage signal test, and an impedance test module is independently arranged, so that the test period is long and the efficiency is low.
Disclosure of Invention
In view of the above, the present invention provides a device, a method and a medium for testing a thyristor of a converter valve, so as to solve the problem that the existing system for testing a thyristor of a converter valve needs to perform a low voltage test and an impedance test respectively, resulting in low efficiency.
In order to solve the above problems, the present invention provides a converter valve thyristor test device, comprising: the system comprises a man-machine interaction module, a photoelectric conversion module, a processor, an A/D module and a signal output module, wherein the man-machine interaction module is connected with the processor through an interface; the photoelectric conversion module is connected with the processor through an interface, and the photoelectric conversion module is connected with the thyristor stage through an optical fiber; the A/D module is connected with the processor through an interface, and the A/D module is connected with the signal output module through a communication interface; the signal output module is electrically connected with the thyristor stage;
the signal output module providing a low voltage test signal and an impedance test signal includes: the device comprises a signal source, a rectifying circuit, a relay and an impedance testing module;
the signal sources are connected to two sides of the input end of the rectifying circuit; the output end of the rectifying circuit is connected with the relay and the impedance testing module, and the relay comprises: a first relay and a second relay, wherein the first relay comprises a switch K 1 The second relay comprises a switch K 2 The method comprises the steps of carrying out a first treatment on the surface of the The switch K 1 And the switch K 2 The single-pole double-throw switch is kept at an OFF position at the beginning of a test, at the moment, the positive electrode of the rectifying circuit is connected to the anode of the thyristor stage to be tested through the first relay, and the negative electrode of the rectifying circuit is connected to the cathode of the thyristor stage to be tested through the second relay; the switch K 1 And the switch K 2 When the switch is switched to the ON position, the positive electrode of the rectifying circuit is connected to the cathode of the thyristor stage to be tested through the second relay, and the negative electrode of the rectifying circuit is connected to the anode of the thyristor stage to be tested through the first relay;
the impedance testing module includes: the voltage division circuit is connected with the thyristor stage in parallel, and the voltage division circuit is connected with the reference resistor in series;
the rectifying circuit is connected with the thyristor level EUT.
The photoelectric conversion module is connected with the thyristor level through optical fibers, and through arranging the optical fibers, the effects of electric isolation, anti-interference, high-speed transmission, long-distance transmission and the like can be achieved, and the safety, reliability and flexibility of a testing process are improved.
By arranging the rectifying circuit, the low-voltage test signal output by the signal source is rectified, the direct current component of the rectified output voltage is increased, the pulsation degree is reduced, and the utilization efficiency of the input sine wave is high.
By setting single-pole double-throw switch K 1 And K 2 The control board for controlling the thyristor level can be realized to take energy, and when the switch K is switched 1 And switch K 2 When the control panel is at the OFF position, the control panel can take energy, and at the moment, a low-voltage test is performed; when switch K 1 And switch K 2 When the control panel is in the ON position, the control panel cannot take energy, and at this time, impedance test is performed. Two tests are carried out in one test process, and the step of manual operation is eliminated, so that the efficiency is improved.
By setting the voltage dividing loop, the voltage of the thyristor stage can be known, and the impedance of the thyristor stage can be calculated conveniently.
Based on the technical scheme, the converter valve thyristor test device can be further improved as follows:
wherein, the man-machine interaction module includes: an operation interface and a display module; the man-machine interaction module communicates with the USB interface through the Ethernet; the operation interface comprises: the device comprises a key control board and a plurality of control buttons, wherein the key control board is used for setting parameters, and the plurality of control buttons are used for controlling the start and stop of the testing device.
The beneficial effects of adopting above-mentioned improvement scheme are: through setting up the operation interface, the operator can set up the parameter that needs in the test process, includes: the time and the number are preset, the test can be carried out for a plurality of times, the parameters are modified, and the accuracy of the test result is ensured.
Through setting up control button, can guarantee that the test process is controllable, if take place unexpected accessible control button and carry out emergency suspension to test equipment, avoid the emergence of accident, promoted the security.
The invention provides a converter valve thyristor test method, which adopts the converter valve thyristor level test device and comprises the following steps:
s10: the signal output module is connected with the thyristor stage, a low-voltage test signal is output, the valve base electronic equipment replies a low-voltage test return signal, and the low-voltage test return signal is sent to the photoelectric conversion module through an optical fiber;
s20: the photoelectric conversion module converts the received low-voltage test return signal into an electric signal, and the processor records the low-voltage test return signal and controls the signal output module to continuously adjust and send the changed low-voltage test signal;
s30: the control board sends a corresponding low-voltage test return signal according to the continuously-changed low-voltage test signal, the low-voltage test return signal is recorded by the processor, recorded content is compared with a pre-stored database, a thyristor-level technical route is determined, closed loop testing is carried out, and meanwhile, the A/D module collects the voltage of the voltage division loop;
s40: after the number of the low-voltage test signals reaches the first preset number, the processor controls the switch K 1 And the switch K 2 Switching from an OFF position to an ON position, the signal source outputting a single pulse impedance test signal;
s50: the valve base electronic equipment sends a single pulse return signal to the processor, the A/D module collects voltage signals of a second preset number of the impedance detection module, and the impedance value of the thyristor level is calculated.
The thyristor stage is to form a loop with a plurality of thyristors. The converter valve thyristor level test method can be used for single-stage thyristor test and multi-stage thyristor test.
The signal output module outputs a low-voltage test signal from the signal source, the low-voltage test signal is rectified and output by the rectifying circuit, the low-voltage test signal is a pulsating direct current after rectification, and the switch K is at the moment 1 And the switch K 2 In the OFF position.
The A/D module collects the voltage of the voltage division loop, and the voltage division loop is connected in parallel with two ends of the thyristor level, so that whether the thyristor level is conducted or not can be judged conveniently, and whether the thyristor level is energy-taking or not can be judged.
In the process that the A/D module collects the voltage signals of the second preset number of the voltage dividing circuit of the impedance detection module, the effective value of the voltage dividing resistor with smaller resistance value in the voltage dividing circuit can be calculated, overvoltage can be avoided, measurement accuracy can be improved through the step, and accurate measurement in a measurement range can be ensured.
Based on the technical scheme, the test method of the thyristor of the converter valve can be further improved as follows:
further, in the step S20, the processor records the low voltage test report signal, and controls the signal output module to continuously adjust and send the changed low voltage test signal, which specifically includes:
the processor generates a group of low-voltage test codes for optical communication according to the pulse width and the pulse number of the low-voltage test return signals and the voltage angle when the return pulses are received when the test voltage is applied, wherein the low-voltage test codes comprise the pulse width and the sending frequency;
and the processor continuously adjusts the pulse width and the sending frequency of the low-voltage test signals generated by the signal output module and sends the pulse width and the sending frequency to the control board of the thyristor stage until the number of the low-voltage test signals reaches the first preset number.
Further, in the step S30, the closed loop test is performed, and the following positioning process is further included:
the signal output module applies the low-voltage test signal to any one of the unipolar thyristors in the converter valve;
the control board of the unipolar thyristor acquires energy after voltage is applied to two ends of the unipolar thyristor, and transmits energy taking return codes to the connected valve-based electronic equipment through the optical fiber;
after receiving the energy-taking return code, the valve base electronic equipment detects a trigger signal sent by a connected signal simulation device in the energy-taking signal period, compares the energy-taking return code with the trigger signal sent by the connected signal simulation device, and confirms the position of the unipolar thyristor through the return code;
after the position is successfully determined by matching, the valve base electronic equipment sends a first trigger code to a control board of a corresponding thyristor level loop through the optical fiber;
the control board performs a responsive triggering operation.
Further, the first trigger code includes: the module information of the thyristor and the position information of the thyristor.
Further, the first trigger code includes: the two trigger stages spaced by a first preset time select the code and the two single pulses spaced by a second preset time of preset pulse widths, and the second trigger stage selects the code and the adjacent first single pulse spaced by a third preset time.
Further, before the step of sending the first trigger code to the control board of the corresponding thyristor-level loop by the valve-based electronic device through the optical fiber, the method further includes:
the signal source monitors zero crossing points of the low-voltage test signal, and after a fourth preset time is monitored after the first preset number of positive zero crossing points of the low-voltage test signal, the processor generates a second trigger code according to the received positions of the unipolar thyristors, and the second trigger code is sent to the valve-based electronic equipment through a spare optical fiber of the converter valve.
The zero crossing point is the moment when the low-voltage test signal is switched between positive and negative half cycles, and the frequency of the low-voltage test signal can be determined by monitoring the zero crossing point of the low-voltage test signal, wherein the frequency refers to the number of times that the low-voltage test signal is periodically repeated in unit time. By detecting the zero crossing point of the low voltage test signal, the number of the low voltage test signals can be accurately grasped.
Further, the a/D module collects the second preset number of voltage signals of the impedance detection module, and calculates an impedance value of the thyristor level, which specifically includes:
the A/D module collects voltage signals of a second preset number of voltage division circuits of the impedance detection module, calculates effective values of the voltage division circuits, and uses the effective values as voltage effective values of the thyristor level;
the A/D module collects the voltage signals of the second preset number of the reference resistors of the impedance detection module, and calculates the voltage effective value of the reference resistors;
the resistance value of the voltage division loop is far larger than that of the thyristor stage, and the thyristor stage is connected in parallel with the voltage division loop, so that the reference resistor is considered to be connected in series with the thyristor stage, and according to the knowledge of the series connection, the reference resistor is equal to the current of the thyristor stage, and the impedance of the thyristor stage is calculated.
The voltage dividing circuit comprises two resistors, wherein the A/D module collects the voltage of the resistor with smaller resistance value in the voltage dividing circuit, calculates the voltage of the voltage dividing circuit according to the equal current of the series circuit, and calculates the voltage effective value of the voltage dividing circuit, and the voltage effective value of the voltage dividing circuit is the voltage effective value of the thyristor stage because the voltage dividing circuit is connected with the thyristor stage in parallel, so that the stability of the result is ensured, and the voltage output by the rectifying circuit dynamically changes at the moment.
The invention provides a computer readable medium, wherein a computer program instruction is stored on the computer readable storage medium, and the computer program instruction realizes the converter valve thyristor test method when being executed by a processor.
Compared with the prior art, the method for testing the thyristor of the converter valve has the beneficial effects that: the signal output module outputs a low-voltage test signal to perform low-voltage test, the connection mode of the test equipment and the thyristor level loop is changed after the low-voltage test signal reaches the preset number, at the moment, the test equipment sends a single-pulse impedance test signal and receives an impedance test return signal, and by the mode, the low-voltage test and the impedance test can be simultaneously performed in one converter valve thyristor test equipment, fewer hardware equipment is used, the test period is shortened, and the test efficiency is improved.
Drawings
FIG. 1 is a schematic block diagram of a thyristor test device for a converter valve according to an embodiment of the invention;
FIG. 2 is a flow chart of a method for testing a thyristor of a converter valve according to an embodiment of the invention;
FIG. 3 is a flowchart of a method for positioning a thyristor test method of a converter valve according to an embodiment of the invention;
FIG. 4 is a schematic diagram of trigger encoding according to an embodiment of the present invention;
fig. 5 is a timing diagram of a test performed on a thyristor of a converter valve according to an embodiment of the invention.
Detailed Description
In order to clearly illustrate the aspects of the present invention, preferred embodiments are described below in detail with reference to the accompanying drawings. An embodiment of the present invention provides a schematic block diagram of a converter valve thyristor test device, as shown in fig. 1, in the device, including: the system comprises an upper computer, a photoelectric conversion module, a processor, an A/D module and a signal output module, wherein the upper computer is connected with the processor through an interface; the photoelectric conversion module is connected with the processor through an interface, and is connected with the thyristor level through an optical fiber; the A/D module is connected with the processor through an interface, and the A/D module is connected with the signal output module through a communication interface; the signal output module is electrically connected with the thyristor stage.
The interface communication can adopt I in serial communication 2 And C, protocol.
The signal output module for providing a low voltage test signal and an impedance test signal includes: the device comprises a signal source, a rectifying circuit, a relay and an impedance testing module;
the signal sources are connected to two sides of the input end of the rectifying circuit; the output end of the rectifying circuit is connected with the relay and the impedance testing module, and the relay comprises: a first relay and a second relay, the first relay comprises a switch K 1 The second relay comprises a switch K 2 The method comprises the steps of carrying out a first treatment on the surface of the Switch K 1 And switch K 2 The single-pole double-throw switch is kept at an OFF position at the beginning of a test, at the moment, the anode of the rectifying circuit is connected to the anode of the thyristor stage to be tested through a first relay, and the cathode of the rectifying circuit is connected to the cathode of the thyristor stage to be tested through a second relay; switch K 1 And switch K 2 When the switch is switched to the ON position, the positive electrode of the rectifying circuit is connected to the cathode of the thyristor stage to be tested through the second relay, and the negative electrode of the rectifying circuitThe first relay is connected to the anode of the thyristor stage to be tested; the signal source adopts a 380V/50Hz signal source, and the rectifying circuit is composed of four diodes D 1 、D 2 、D 3 、D 4 The rectification circuit outputs 100Hz half-wave voltage.
The impedance testing module includes: the voltage division circuit is connected with the thyristor stage in parallel, and the voltage division circuit is connected with the reference resistor in series. The voltage dividing circuit is provided with two resistors, one voltage dividing resistor R 2 Is 1 megaohm, another voltage dividing resistor R 3 1 kilo-ohm, reference resistance R 1 。
The rectifying circuit is connected with the thyristor level EUT.
In the above technical solution, the man-machine interaction module includes: an operation interface and a display module; the man-machine interaction module communicates with the USB interface through the Ethernet; the operation interface comprises: the device comprises a key control board and a plurality of control buttons, wherein the key control board is used for setting parameters, and the control buttons are used for controlling the start and stop of the testing device.
The embodiment of the invention provides a flow chart of a converter valve thyristor test method, as shown in fig. 2, in the method, the converter valve thyristor level test device is adopted, and the flow chart comprises the following steps:
s10: the signal output module is connected with the thyristor stage, a low-voltage test signal is output, the valve base electronic equipment replies a low-voltage test return signal and sends the low-voltage test return signal to the photoelectric conversion module through an optical fiber;
s20: the photoelectric conversion module converts the received low-voltage test return signal into an electric signal, and the processor records the low-voltage test return signal and controls the signal output module to continuously adjust and send the changed low-voltage test signal;
s30: the control board sends a corresponding low-voltage test return signal according to the continuously-changed low-voltage test signal, the low-voltage test return signal is recorded by the processor, recorded content is compared with a pre-stored database, a thyristor-level technical route is determined, closed loop test is carried out, and meanwhile, the A/D module collects voltage division loop voltage;
s40: the number of low voltage test signals reaches the firstAfter a preset number, the processor controls the switch K 1 And switch K 2 Switching from an OFF position to an ON position, and outputting a single pulse impedance test signal by a signal source;
s50: the valve base electronic equipment sends a single pulse return signal to the processor, the A/D module collects voltage signals of a second preset number of the impedance detection modules, and the impedance value of the thyristor level is calculated.
Further, in the above technical solution, in step S20, the processor records the low voltage test report signal, and controls the signal output module to continuously adjust and send the changed low voltage test signal, and the specific steps include:
the processor generates a group of low-voltage test codes for optical communication according to the pulse width and the pulse number of the low-voltage test return signals and the voltage angle when the return pulses are received when the test voltage is applied, wherein the low-voltage test codes comprise the pulse width and the sending frequency;
the processor continuously adjusts the pulse width and the sending frequency of the low-voltage test signals generated by the signal output module and sends the pulse width and the sending frequency to the control board of the thyristor stage until the number of the low-voltage test signals reaches a first preset number.
And extracting the recorded content to obtain information such as different voltage values, pulse width and the like of the low-level test return signal, and if the information is matched with the technical route in the database, determining that the matched technical route is the technical route of the thyristor. The result of this comparison may also be stored in the memory of the processor. The information is written into a database after being arranged and typeset, and data updating can be completed.
By the method, the technical routes of the thyristors can be matched in the test process, so that corresponding closed loop tests can be carried out according to different technical routes, compatibility is achieved, a test system which is adapted according to the replacement of the thyristors of different manufacturers is not needed, and the test efficiency is improved.
In step S30 of the method for testing a thyristor of a converter valve, the method further includes a positioning process, and a flowchart of the positioning method is shown in fig. 3, and the specific steps include:
s31: the signal output module applies a low-voltage test signal to any one of the unipolar thyristors in the converter valve;
s32: the control board of the unipolar thyristor obtains energy after voltage is applied to two ends of the unipolar thyristor, and transmits energy-taking return codes to the connected valve-based electronic equipment through optical fibers;
s33: after receiving the energy-taking return code, the valve base electronic equipment detects a trigger signal sent by a connected signal simulation device in the energy-taking signal period, compares the two signals, and confirms the position of the unipolar thyristor through the return code;
s34: after the position is successfully determined by matching, the valve base electronic equipment sends a first trigger code to a control board of a corresponding thyristor level loop through optical fibers;
s35: the control board performs a responsive trigger operation.
Further, in the above technical solution, the first trigger code includes: the module information of the thyristor and the position information of the thyristor. The meaning of the coded bit representation of the thyristor position information is shown in table 1.
TABLE 1 coding of thyristor position information
Further, in the above technical solution, the first trigger code includes: the two trigger stages spaced by a first preset time select the code and the two single pulses spaced by a second preset time of preset pulse widths, and the second trigger stage selects the code and the adjacent first single pulse spaced by a third preset time.
The first preset time, the second preset time, and the third preset time may be empirically set. For example, the first preset time is 10us, the second preset time is 25us, and the third preset time is 1000us. The preset pulse width may also be empirically set, for example, with a preset pulse width of 1us.
As shown in fig. 4, each bit of the above code is high and low with a clock period of 1us, and represents valid; when two low levels, this represents an invalid. For optical fibers, a high level indicates light and a low level indicates no light.
For example, the selected location is the level 1 thyristor of module 1, as shown in table 2.
Table 2 complete Crystal Gate trigger coding scheme
When a thyristor is to be triggered, first 1 thyristor position code is sent, with an interval of 10us at which one thyristor position code is sent. The two transmissions are to ensure that the transmitted codes are more reliable. Likewise, two single pulses are sent after a gap of 960us, with a gap of 24us between the two single pulses.
Further, in the above technical solution, before the step of sending the trigger code to the control board of the corresponding thyristor-level loop by the valve-based electronic device through the optical fiber, the method further includes:
the signal source monitors zero crossing points of the low-voltage test signals, and at a fourth preset time after the first preset number of positive zero crossing points of the low-voltage test signals are monitored, the processor generates a second trigger code according to the received positions of the unipolar thyristors, and the second trigger code is sent to the valve base electronic equipment through the spare optical fiber of the converter valve.
Both the first preset number and the fourth preset time may be empirically set. For example, the first preset number is 3 and the fourth preset time is 5ms.
By the positioning method, the tested thyristors can be positioned so as to grasp the condition of the specific thyristors, and the position of the thyristors can be determined in time for overhauling when faults occur.
After the low-voltage test is finished, the processor controls the thyristor control boards to be unable to continue to take energy after the K1 and K2 are turned on, the test equipment sends a single pulse signal to the thyristor control boards, the control boards maintain a working voltage for a period of time after losing energy taking, and when the control boards receive the single pulse signal sent by the test equipment, the control boards send a single pulse return signal to the test equipment. In the process, the test equipment records the time from the turn-on of K1 and K2 to the receipt of the last single pulse return pulse. The energy taking and maintaining time of the thyristor control board is 800ms.
The timing chart of the test method of the thyristor of the converter valve provided by the embodiment of the invention is shown in figure 5.
Further, in the above technical solution, the a/D module collects voltage signals of a second preset number of the impedance detection modules, and calculates an impedance value of the thyristor level, and the specific steps include:
the A/D module collects voltage signals of a second preset number of voltage division loops of the impedance detection module, calculates effective values of the voltage division loops, and uses the effective values as effective voltage values of the thyristor level;
the A/D module collects voltage signals of a second preset number of reference resistors of the impedance detection module, and calculates voltage effective values of the reference resistors;
the resistance value of the voltage division loop is far larger than that of the thyristor stage, and the thyristor stage is connected in parallel with the voltage division loop, so that the reference resistor is considered to be connected in series with the thyristor stage, and according to the knowledge of the series connection, the reference resistor is equal to the current of the thyristor stage, and the impedance of the thyristor stage is calculated.
For example, the number of the cells to be processed,
the sampling rate of the A/D module is 20KSPS, and the voltage of the Ain1 point is R 3 The voltage at two ends has the following calculation formula:
wherein U is rms Representing the effective value of the voltage at two ends of the thyristor, u n The voltage at each point is indicated (n=1, 2, … … 200).
Meanwhile, the A/D module acquires Ain2 point voltage as a reference resistor R 1 Voltage u across rn R is also calculated according to the above formula 1 The effective value of the voltage at two ends is U r1 Because of R 2 、R 3 Far greater than the thyristor level loop impedanceThe values, the formulas can be listed according to the equality of the currents in the series circuit:
wherein R is scr Is the impedance value of the thyristor being tested.
The impedance test time of the two ends of the thyristor is about 100ms and is far less than the energy taking and maintaining time of the thyristor control board by 800ms. The low voltage test and the impedance test are completed in the same test.
The present invention provides a computer readable medium having stored thereon computer program instructions; the computer program instructions, when executed by the processor, implement the converter valve thyristor test method described above.
Specifically, the principle of the invention is as follows: the signal output module outputs a low-voltage test signal, and the valve base electronic equipment replies a low-voltage test return signal; the processor records the return signal and controls the signal output module to continuously adjust the low-voltage test signal; the control board sends a corresponding low-voltage test return signal, the processor records the return signal and compares the return signal with a database to determine a technical route, and closed loop test is carried out; after the number of the low-voltage test signals reaches a first preset number, the processor controls the switch K 1 And switch K 2 Switching from an OFF position to an ON position, and outputting a single pulse impedance test signal by a signal source; the control board of the thyristor stage sends a single pulse return signal to the processor, and the A/D module collects voltage signals of a second preset number of the impedance detection modules and calculates the impedance value of the thyristor stage.
Any modification, equivalent replacement, improvement, etc. made in the embodiments of the present invention shall fall within the scope of the present invention, as long as they are within the spirit and principle of the present invention.
Claims (10)
1. A converter valve thyristor test device comprising: the system comprises a man-machine interaction module, a photoelectric conversion module, a processor, an A/D module and a signal output module, and is characterized in that the man-machine interaction module is connected with the processor through an interface; the photoelectric conversion module is connected with the processor through an interface, and the photoelectric conversion module is connected with the thyristor stage through an optical fiber; the A/D module is connected with the processor through an interface, and the A/D module is connected with the signal output module through a communication interface; the signal output module is electrically connected with the thyristor stage;
the signal output module providing a low voltage test signal and an impedance test signal includes: the device comprises a signal source, a rectifying circuit, a relay and an impedance testing module;
the signal sources are connected to two sides of the input end of the rectifying circuit; the output end of the rectifying circuit is connected with the relay and the impedance testing module, and the relay comprises: a first relay and a second relay, wherein the first relay comprises a switch K 1 The second relay comprises a switch K 2 The method comprises the steps of carrying out a first treatment on the surface of the The switch K 1 And the switch K 2 The single-pole double-throw switch is kept at an OFF position at the beginning of a test, at the moment, the positive electrode of the rectifying circuit is connected to the anode of the thyristor stage to be tested through the first relay, and the negative electrode of the rectifying circuit is connected to the cathode of the thyristor stage to be tested through the second relay; the switch K 1 And the switch K 2 When the switch is switched to the ON position, the positive electrode of the rectifying circuit is connected to the cathode of the thyristor stage to be tested through the second relay, and the negative electrode of the rectifying circuit is connected to the anode of the thyristor stage to be tested through the first relay;
the impedance testing module includes: the voltage division circuit is connected with the thyristor stage in parallel, and the voltage division circuit is connected with the reference resistor in series;
the rectifying circuit is connected with the thyristor level EUT.
2. The converter valve thyristor test device of claim 1, wherein said human-machine interaction module comprises: an operation interface and a display module; the man-machine interaction module communicates with the USB interface through the Ethernet; the operation interface comprises: the device comprises a key control board and a plurality of control buttons, wherein the key control board is used for setting parameters, and the plurality of control buttons are used for controlling the start and stop of the testing device.
3. A converter valve thyristor test method employing a converter valve thyristor level test device according to any one of claims 1-2, comprising:
s10: the signal output module is connected with the thyristor stage, a low-voltage test signal is output, the valve base electronic equipment replies a low-voltage test return signal, and the low-voltage test return signal is sent to the photoelectric conversion module through an optical fiber;
s20: the photoelectric conversion module converts the received low-voltage test return signal into an electric signal, and the processor records the low-voltage test return signal and controls the signal output module to continuously adjust and send the changed low-voltage test signal;
s30: the control board sends a corresponding low-voltage test return signal according to the continuously-changed low-voltage test signal, the low-voltage test return signal is recorded by the processor, recorded content is compared with a pre-stored database, a thyristor-level technical route is determined, closed loop testing is carried out, and meanwhile, the A/D module collects the voltage of the voltage division loop;
s40: after the number of the low-voltage test signals reaches the first preset number, the processor controls the switch K 1 And the switch K 2 Switching from an OFF position to an ON position, the signal source outputting a single pulse impedance test signal;
s50: the valve base electronic equipment sends a single pulse return signal to the processor, the A/D module collects voltage signals of a second preset number of the impedance detection module, and the impedance value of the thyristor level is calculated.
4. A method according to claim 3, wherein in the step S20, the processor records the low voltage test report signal and controls the signal output module to continuously adjust and send the changed low voltage test signal, and the specific steps include:
the processor generates a group of low-voltage test codes for optical communication according to the pulse width and the pulse number of the low-voltage test return signals and the voltage angle when the return pulses are received when the test voltage is applied, wherein the low-voltage test codes comprise the pulse width and the sending frequency;
and the processor continuously adjusts the pulse width and the sending frequency of the low-voltage test signals generated by the signal output module and sends the pulse width and the sending frequency to the control board of the thyristor stage until the number of the low-voltage test signals reaches the first preset number.
5. A method for testing a thyristor of a converter valve according to claim 3, wherein said step S30 comprises the steps of:
s31: the signal output module applies the low-voltage test signal to any one of the unipolar thyristors in the converter valve;
s32: the control board of the unipolar thyristor acquires energy after voltage is applied to two ends of the unipolar thyristor, and transmits energy taking return codes to the connected valve-based electronic equipment through the optical fiber;
s33: after receiving the energy-taking return code, the valve base electronic equipment detects a trigger signal sent by a connected signal simulation device in the energy-taking signal period, compares the energy-taking return code with the trigger signal sent by the connected signal simulation device, and confirms the position of the unipolar thyristor through the return code;
s34: after the position is successfully determined by matching, the valve base electronic equipment sends a first trigger code to a control board of a corresponding thyristor level loop through the optical fiber;
s35: the control board performs a responsive triggering operation.
6. The method of claim 5, wherein the first trigger code comprises: the module information of the thyristor and the position information of the thyristor.
7. The method of claim 5, wherein the first trigger code comprises: the two trigger stages spaced by a first preset time select the code and the two single pulses spaced by a second preset time of preset pulse widths, and the second trigger stage selects the code and the adjacent first single pulse spaced by a third preset time.
8. The method of claim 5, wherein prior to the step of the valve-based electronic device sending a first trigger code to a control board of a corresponding thyristor-level loop via the optical fiber, the method further comprises:
the signal source monitors zero crossing points of the low-voltage test signal, and after a fourth preset time after the first preset number of positive zero crossing points of the low-voltage test signal are monitored, the processor generates a second trigger code according to the received positions of the unipolar thyristors, and the second trigger code is sent to the valve-based electronic equipment through a spare optical fiber of the converter valve.
9. A method for testing a thyristor of a converter valve according to claim 3, wherein said a/D module collects said second predetermined number of voltage signals from said impedance detection module, and calculates an impedance value of said thyristor level, comprising the steps of:
the A/D module collects voltage signals of a second preset number of voltage division circuits of the impedance detection module, calculates effective values of the voltage division circuits, and uses the effective values as voltage effective values of the thyristor level;
the A/D module collects the voltage signals of the second preset number of the reference resistors of the impedance detection module, and calculates the voltage effective value of the reference resistors;
the resistance value of the voltage division loop is far larger than that of the thyristor stage, and the thyristor stage is connected in parallel with the voltage division loop, so that the reference resistor is considered to be connected in series with the thyristor stage, and according to the knowledge of the series connection, the reference resistor is equal to the current of the thyristor stage, and the impedance of the thyristor stage is calculated.
10. A computer readable medium having computer program instructions stored thereon; the computer program instructions, when executed by a processor, implement a method of testing a thyristor of a converter valve according to any one of claims 3 to 9.
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| CN202310916667.5A CN117031234A (en) | 2023-07-24 | 2023-07-24 | Converter valve thyristor level testing device, method and medium |
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| CN202310916667.5A CN117031234A (en) | 2023-07-24 | 2023-07-24 | Converter valve thyristor level testing device, method and medium |
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