Control monitoring system for thyristor converter valve
By introducing optical fiber connection and multi-module processing into the control and monitoring system of the thyristor converter valve, the problem of low communication reliability is solved, more accurate data acquisition and terminal voltage waveform reconstruction are achieved, and the working efficiency of the system is improved.
Patent Information
- Application Number
- CN202510339847.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-21
- Publication Date
- 2025-06-13
AI Technical Summary
In the prior art, in the control and monitoring system of the thyristor converter valve, the communication reliability between the trigger monitoring board and the valve-based electronic device is low, resulting in inaccurate data sampling.
By introducing optical fiber connection between the trigger monitoring board and the valve-based electronic device, and setting sampling resistors, sampling modules, judgment modules and processing modules in the trigger monitoring board, the monitoring data is collected and processed according to the terminal voltage of the thyristor, and the end voltage waveform of the thyristor is reconstructed.
It improves the communication reliability between the trigger monitoring board and the valve-based electronic device, reduces the amount of data, simplifies the process of terminal voltage waveform reconstruction, and improves work efficiency.
Smart Images
Figure CN120142887A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of power transmission and transformation, and particularly to a control and monitoring system for a thyristor converter valve. Background Art
[0002] A DC transmission converter valve is usually composed of multiple thyristor stage circuits, also known as a thyristor converter valve. A control and detection system including a trigger monitoring board card and valve base electronics (VBE) can usually be used to control and monitor the thyristor converter valve.
[0003] The thyristor stage circuit can include thyristors and voltage equalizing resistors, etc. The voltage of the thyristor can directly reflect the working state of the thyristor stage circuit and can be used to evaluate the working state and fault analysis of the thyristor stage circuit. However, the thyristor converter valve usually does not have the function of sampling the thyristor voltage. In order to collect the thyristor voltage, the related control and monitoring system often samples at equal time intervals through the trigger monitoring board card and sends it to the VBE through optical fibers, and then obtains the thyristor voltage through the VBE. In order to obtain an accurate voltage waveform, the time interval is usually set relatively small (it can reach one hundred microseconds and below), which will result in a large amount of data communication between the trigger monitoring board card and the VBE. That is to say, the communication reliability between the trigger monitoring board card and the VBE is low. Summary of the Invention
[0004] In order to solve the problem of low communication reliability between the trigger monitoring board card and the VBE in the prior art, this application provides a control and monitoring system for a thyristor converter valve, which can include a trigger monitoring board card and valve base electronics. The trigger monitoring board card is connected to the thyristor, and the trigger monitoring board card is also connected to the valve base electronics. In this application, the trigger monitoring board card and the valve base electronics can be connected through optical fibers.
[0005] The trigger monitoring board card is used for: sending monitoring data to the valve base electronics according to the terminal voltage of the thyristor.
[0006] The valve base electronics is used for: reconstructing the terminal voltage waveform of the thyristor according to the monitoring data.
[0007] Optionally, the monitoring data includes a first period, a second period, and a third period.
[0008] Among them, the first period is used to indicate the moment from the positive zero-crossing moment of the terminal voltage of the thyristor to the moment when the trigger monitoring board card receives the trigger signal from the valve base electronics.
[0009] The second period is used to indicate the moment from when the trigger monitoring board card receives the trigger signal to the negative zero-crossing moment.
[0010] The third time period is used to indicate the positive zero-crossing moment to the negative zero-crossing moment.
[0011] In some possible implementation manners, the trigger monitoring board includes a sampling resistor, a sampling module, a judgment module, and a processing module.
[0012] The first end of the sampling resistor is connected to the anode of the thyristor through a voltage-sharing resistor, the second end of the sampling resistor is connected to the cathode of the thyristor, the input ends of the sampling module and the judgment module are connected to the first end of the sampling resistor, the output ends of the sampling module and the judgment module are connected to the input end of the processing module, and the output end of the processing module is connected to the valve base electronic device.
[0013] Optionally, the sampling resistor is used to: obtain the terminal voltage of the thyristor.
[0014] The sampling module is used to: convert the terminal voltage of the thyristor into a digital voltage signal.
[0015] The judgment module is used to: determine the positive zero-crossing moment and the negative zero-crossing moment according to the terminal voltage of the thyristor.
[0016] The processing module is used to: send the first time period, the second time period, and the third time period to the valve base electronic device according to the digital voltage signal, the positive zero-crossing moment, and the negative zero-crossing moment.
[0017] Furthermore, the valve base electronic device is further used to: send a trigger signal to the trigger monitoring board.
[0018] The processing module is further used to: generate a first control signal according to the trigger signal and the positive zero-crossing moment and send it to the sampling module, and generate a second control signal according to the trigger signal and the negative zero-crossing moment and send it to the sampling module.
[0019] The sampling module is used to: convert the terminal voltage of the thyristor before conduction into a first digital voltage signal according to the first control signal, and convert the terminal voltage of the thyristor at the negative zero-crossing moment into a second digital voltage signal according to the second control signal.
[0020] The processing module is further used to: send the first digital voltage signal and the second digital voltage signal to the valve base electronic device.
[0021] Wherein, the digital voltage signal includes the first digital voltage signal and the second digital voltage signal.
[0022] In some other possible implementation manners, the valve base electronic device includes a reconstruction module and a control module.
[0023] The reconstruction module is used to: reconstruct the terminal voltage waveform of the thyristor according to the monitoring data, the first digital voltage signal, and the second digital voltage signal, and output the reconstructed voltage waveform.
[0024] The control module is configured to: send a trigger signal to the processing module.
[0025] Exemplarily, the reconstruction module is specifically configured to:
[0026] In the first time period, according to the first digital voltage signal, use a sine function to reconstruct the terminal voltage waveform of the thyristor to obtain the voltage waveform of the first time period.
[0027] In the second time period, use the conduction voltage drop of the thyristor as the voltage waveform of the second time period.
[0028] In the third time period, simulate the terminal voltage of the thyristor according to the second digital voltage signal to obtain the voltage waveform of the third time period.
[0029] Among them, the voltage waveform of the first time period, the voltage waveform of the second time period, and the voltage waveform of the third time period constitute the reconstructed voltage waveform.
[0030] Optionally, the processing module is a Complex Programmable Logic Device (CPLD) or a Field Programmable Gate Array (FPGA).
[0031] Compared with the prior art, the beneficial effects of this application are:
[0032] In the control and monitoring system of the thyristor converter valve provided by this application, the trigger monitoring board can send monitoring data to the Valve Base Electronics (VBE) according to the terminal voltage of the thyristor, and the VBE reconstructs the terminal voltage waveform of the thyristor according to the monitoring data. It can be seen that this application can realize the reconstruction of the thyristor terminal voltage through the monitoring data, without the trigger monitoring board sampling data at equal time intervals, greatly reducing the data volume and improving the communication reliability between the trigger monitoring board and the VBE.
[0033] This application divides the power frequency period of the thyristor into three time periods according to the positive zero-crossing moment, the negative zero-crossing moment of the thyristor terminal voltage, and the moment when the trigger monitoring board receives the trigger signal from the valve base electronic equipment. According to these three time periods, the terminal voltage before the thyristor conducts, and the terminal voltage at the negative zero-crossing moment of the thyristor, the reconstruction of the terminal voltage waveform is realized. That is to say, this application can realize the reconstruction of the terminal voltage waveform only through five data, namely three moments and two voltages, greatly simplifying the process of terminal voltage waveform reconstruction and improving the working efficiency of the trigger monitoring board and the VBE. Description of the Drawings
[0034] To more clearly illustrate the technical solutions in the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0035] Figure 1 It is a schematic structural diagram of a control and monitoring system in an embodiment of the present application;
[0036] Figure 2 It is a schematic waveform diagram of the terminal voltage of a thyristor in an embodiment of the present application. Detailed implementation manners
[0037] The following will describe the technical solutions in the present application in conjunction with the drawings.
[0038] In the embodiments of the specification, claims and drawings of the present application, terms such as "first", "second", etc. are only used for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order. In addition, the terms "include" and "have" and any of their variations are intended to cover non-exclusive inclusion. For example, a method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.
[0039] It should be understood that in the present application, "at least one (item)" means one or more, and "a plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that there can be three relationships. For example, "A and / or B" can mean: only A exists, only B exists, and both A and B exist at the same time. Among them, A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after. "At least one (one) of the following" or its similar expression refers to any combination of these items, including any combination of single items (ones) or plural items (ones). For example, at least one (one) of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a, b and c", where a, b, c can be single or multiple.
[0040] The present application provides a control and monitoring system for a thyristor converter valve, as Figure 1As shown. The control monitoring system 10 includes a trigger monitoring board 1 and valve base electronics 2. The trigger monitoring board 1 is connected to the thyristor Thy, and the trigger monitoring board 1 is also connected to the valve base electronics 2. In this application, the trigger monitoring board 1 and the valve base electronics 2 can be connected by optical fiber.
[0041] Optionally, the trigger monitoring board 1 is configured to: send monitoring data to the valve base electronics 2 according to the terminal voltage of the thyristor Thy (which can be represented by V).
[0042] The valve base electronics 2 is configured to: reconstruct the terminal voltage waveform of the thyristor Thy according to the monitoring data.
[0043] Optionally, the monitoring data includes a first time period T1, a second time period T2, and a third time period T3.
[0044] As Figure 2 shown, the first time period T1 is used to indicate the time from the moment of the positive zero crossing of the terminal voltage of the thyristor Thy (which can be represented by t1) to the moment when the trigger monitoring board 1 receives the trigger signal from the valve base electronics 2 (which can be represented by t2).
[0045] The second time period T2 is used to indicate the time from the moment t2 when the trigger monitoring board 1 receives the trigger signal to the moment of the negative zero crossing (which can be represented by t3).
[0046] The third time period T3 is used to indicate the time from the moment of the positive zero crossing t1 to the moment of the negative zero crossing t3.
[0047] Figure 2 where the ordinate represents the terminal voltage of the thyristor Thy and the abscissa represents time.
[0048] In some possible implementation manners, continuing to refer to Figure 1 , the trigger monitoring board 1 includes a sampling resistor R1, a sampling module 11, a judgment module 12, and a processing module 13.
[0049] The first end of the sampling resistor R1 is connected to the anode of the thyristor Thy through a voltage-sharing resistor R2 in the thyristor stage circuit, the second end of the sampling resistor R1 is connected to the cathode of the thyristor Thy, the input ends of the sampling module 11 and the judgment module 12 are connected to the first end of the sampling resistor R1, the output ends of the sampling module 11 and the judgment module 12 are connected to the input end of the processing module 13, and the output end of the processing module 13 is connected to the valve base electronics 2.
[0050] Optionally, the sampling resistor R1 is configured to: obtain the terminal voltage of the thyristor Thy.
[0051] The sampling module 11 is configured to: convert the terminal voltage V of the thyristor Thy into a digital voltage signal (which may include a first digital voltage signal and a second digital voltage signal).
[0052] The determination module 12 is configured to: determine the positive zero-crossing moment t1 and the negative zero-crossing moment t3 according to the terminal voltage V of the thyristor Thy.
[0053] The processing module 13 is configured to: send the first time period T1, the second time period T2, and the third time period T3 to the valve base electronic device 2 according to the digital voltage signal, the positive zero-crossing moment t1, and the negative zero-crossing moment t3.
[0054] Furthermore, the valve base electronic device 2 is further configured to: send a trigger signal to the trigger monitoring board 1.
[0055] The processing module 13 is further configured to: generate a first control signal CS1 according to the trigger signal and the positive zero-crossing moment t1 and send it to the sampling module 11, and generate a second control signal CS2 according to the trigger signal and the negative zero-crossing moment t2 and send it to the sampling module 11.
[0056] The sampling module 11 is configured to: convert the terminal voltage of the thyristor Thy before conduction (which can be represented by V1) into a first digital voltage signal DS1 according to the first control signal CS1, and convert the terminal voltage of the thyristor Thy at the negative zero-crossing moment t3 (which can be represented by V2) into a second digital voltage signal DS2 according to the second control signal CS2.
[0057] The processing module 13 is further configured to: send the first digital voltage signal DS1 and the second digital voltage signal DS2 to the valve base electronic device 2.
[0058] Wherein, the digital voltage signal includes the first digital voltage signal DS1 and the second digital voltage signal DS2.
[0059] In some other possible implementation manners, the valve base electronic device 2 includes a reconstruction module 21 and a control module 22.
[0060] The reconstruction module 21 is configured to: reconstruct the terminal voltage waveform of the thyristor Thy according to the monitoring data, the first digital voltage signal DS1, and the second digital voltage signal DS2, and output the reconstructed voltage waveform.
[0061] The control module 22 is configured to: send a trigger signal to the processing module 13.
[0062] Exemplarily, the reconstruction module 21 is specifically configured to:
[0063] In the first time period, according to the first digital voltage signal DS1, use a sine function to reconstruct the terminal voltage waveform of the thyristor Thy to obtain the voltage waveform of the first time period T1.
[0064] In the second time period, use the conduction voltage drop of the thyristor Thy as the voltage waveform of the second time period T2.
[0065] In the third time period, according to the second digital voltage signal DS2, the terminal voltage of the thyristor Thy is simulated to obtain the voltage waveform of the third time period T3.
[0066] Among them, the voltage waveform of the first time period T1, the voltage waveform of the second time period T2, and the voltage waveform of the third time period T3 constitute the reconstructed voltage waveform.
[0067] Optionally, the processing module 13 is a Complex Programmable Logic Device (CPLD) or a Field Programmable Gate Array (FPGA).
[0068] The above are only embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention pending approval.
Claims
1. A control and monitoring system for a thyristor commutator valve, characterized in that: It includes a trigger monitoring board and a valve base electronic device; the trigger monitoring board is connected to the thyristor, and the trigger monitoring board is also connected to the valve base electronic device; The trigger monitoring board is used to: send monitoring data to the valve base electronic device according to the terminal voltage of the thyristor; The valve-based electronic device is used to reconstruct the terminal voltage waveform of the thyristor according to the monitoring data.
2. The control and monitoring system according to claim 1, characterized in that: The monitoring data includes a first period, a second period and a third period; Wherein, the first time period is used to indicate the time from the positive zero-crossing point of the terminal voltage of the thyristor to the time when the trigger monitoring board receives the trigger signal from the valve base electronic device; The second time period is used to indicate the time from when the trigger monitoring board receives the trigger signal to when the reverse zero-crossing point occurs; The third time period is used to indicate the time from the forward zero-crossing point to the reverse zero-crossing point.
3. The control and monitoring system according to claim 2, characterized in that: The trigger monitoring board includes a sampling resistor, a sampling module, a judgment module and a processing module; The first end of the sampling resistor is connected to the anode of the thyristor through a voltage-equalizing resistor, the second end of the sampling resistor is connected to the cathode of the thyristor, the input ends of the sampling module and the judgment module are respectively connected to the first end of the sampling resistor, the output ends of the sampling module and the judgment module are respectively connected to the input end of the processing module, and the output end of the processing module is connected to the valve base electronic device.
4. The control and monitoring system according to claim 3, characterized in that: The sampling resistor is used to: obtain the terminal voltage of the thyristor; The sampling module is used to: convert the terminal voltage of the thyristor into a digital voltage signal; The judgment module is used to: determine the forward zero-crossing point moment and the reverse zero-crossing point moment according to the terminal voltage of the thyristor; The processing module is used to send the first time period, the second time period and the third time period to the valve base electronic device according to the digital voltage signal, the positive zero-crossing point moment and the reverse zero-crossing point moment.
5. The control and monitoring system according to claim 4, characterized in that: The valve base electronic device is also used to: send a trigger signal to the trigger monitoring board; The processing module is further used to: generate a first control signal according to the trigger signal and the forward zero-crossing point moment and send it to the sampling module, and generate a second control signal according to the trigger signal and the reverse zero-crossing point moment and send it to the sampling module; The sampling module is used to: convert the terminal voltage of the thyristor before being turned on into a first digital voltage signal according to the first control signal, and convert the terminal voltage of the thyristor at the reverse zero-crossing moment into a second digital voltage signal according to the second control signal; The digital voltage signal includes the first digital voltage signal and the second digital voltage signal.
6. The control and monitoring system according to claim 5, characterized in that: The processing module is further used for sending the first digital voltage signal and the second digital voltage signal to the valve base electronic device.
7. The control and monitoring system according to claim 6, characterized in that: The valve base electronic device includes a reconstruction module and a control module; The reconstruction module is used to reconstruct the terminal voltage waveform of the thyristor according to the monitoring data, the first digital voltage signal and the second digital voltage signal, and output the reconstructed voltage waveform; The control module is used to send a trigger signal to the processing module.
8. The control and monitoring system according to claim 7, characterized in that: The reconstruction module is specifically used for: In the first time period, according to the first digital voltage signal, a sine function is used to reconstruct the terminal voltage waveform of the thyristor to obtain a voltage waveform of the first time period; In the second period, the on-state voltage drop of the thyristor is used as the voltage waveform of the second period; In the third time period, simulating the terminal voltage of the thyristor according to the second digital voltage signal to obtain a voltage waveform of the third time period; The voltage waveform of the first time period, the voltage waveform of the second time period and the voltage waveform of the third time period constitute the reconstructed voltage waveform.
9. The control and monitoring system according to any one of claims 3 to 8, characterized in that: The processing module is a complex programmable logic device (CPLD) or a field programmable gate array (FPGA).
10. The control and monitoring system according to claim 1, characterized in that: The trigger monitoring board is connected to the valve base electronic equipment via an optical fiber.