System and method for online monitoring of thyristor valve set anomalies

Abstract

The present application relates to the technical field of thyristor online monitoring, and discloses a system and method for online monitoring of thyristor valve group abnormalities, comprising: a main controller sending a drive trigger signal to each thyristor valve group through a control unit; a drive detection module collecting the drive trigger signal corresponding to the thyristor valve group, outputting a drive detection signal and feeding back to the control unit; a valve group detection module detecting the pressure difference between the two ends of the thyristor valve group, outputting a thyristor detection signal and feeding back to the control unit; the control unit feeding back the drive detection signal and the thyristor detection signal to the main controller, and the main controller judging whether the thyristor valve group has abnormalities according to the drive trigger signal, the drive detection signal and the thyristor detection signal. The present application detects the running state and drive trigger of the thyristor valve group, provides the state information of the thyristor valve group to the user through the main controller, facilitates the rapid detection and positioning of valve group faults, reduces the difficulty of related fault troubleshooting and improves the fault handling efficiency.

Description

Technical Field

[0001] This invention relates to the field of thyristor online monitoring technology, and in particular to a system and method for online monitoring of thyristor valve group abnormalities. Background Technology

[0002] Currently, some electric heating systems employ high-voltage power supply schemes, such as 6kV and 10kV power supply heating schemes, which mainly use multiple thyristors connected in series for voltage division to meet the requirements. In practical applications, the quality of the thyristors directly affects the reliable operation and service life of the system. Existing technologies (such as CN218482776U - a voltage equalization protection circuit for a high-voltage series switching transistor) use the detection of thyristor output to determine thyristor faults. However, when a thyristor fails and has no output, it is difficult to quickly identify the specific faulty thyristor. Therefore, monitoring the operating status and drive reliability of thyristors or thyristor valve assemblies is an important means of quickly detecting and eliminating faults. Summary of the Invention

[0003] The purpose of this invention is to monitor the operating status and drive triggering of thyristor valve groups, realize online monitoring of thyristor valve group abnormalities, quickly locate faults, promptly disconnect faulty machines or stop drive triggering, and avoid the risk from escalating, thereby providing a system and method for online monitoring of thyristor valve group abnormalities.

[0004] To achieve the above-mentioned objectives, the embodiments of the present invention provide the following technical solutions:

[0005] The system for online monitoring of thyristor valve group anomalies includes: a main controller, a control unit, N thyristor valve groups, N drive detection modules, and N valve group detection modules, where N is an integer greater than or equal to 1. If N>1, the N thyristor valve groups are connected in series.

[0006] The main controller is connected to the control unit and is used to send drive trigger signals;

[0007] N drive detection modules are connected one-to-one with the drive circuits of N thyristor valve groups to collect the drive trigger signal corresponding to each thyristor valve group and output the drive detection signal.

[0008] N valve group detection modules are connected one-to-one with N thyristor valve groups to detect the pressure difference across each thyristor valve group and output thyristor detection signals.

[0009] N drive detection modules are connected to the control unit respectively, and are used to feed back drive detection signals to the control unit;

[0010] N valve group detection modules are connected to the control unit respectively, and are used to feed back the thyristor detection signal to the control unit.

[0011] The control unit feeds back the drive detection signal and the thyristor valve group detection signal to the main controller. The main controller determines whether there is an abnormality in the thyristor valve group based on the drive trigger signal, drive detection signal, and thyristor detection signal, and determines whether the abnormality in the thyristor valve group is caused by a drive triggering abnormality.

[0012] In the above scheme, each thyristor valve group is connected to a corresponding valve group detection module and a drive detection module. The valve group detection module can detect whether the thyristor valve group is running, and the drive detection module can detect whether the drive trigger signal sent by the main controller reaches the thyristor valve group. Then, the main controller can determine whether there is an abnormality and the location of the abnormality based on the drive trigger signal, drive detection signal, and thyristor detection signal.

[0013] Furthermore, each of the thyristor valve groups includes a first thyristor and a second thyristor connected in parallel; the first end of the first thyristor is connected to the second end of the second thyristor to serve as the first connection end K1 of the thyristor valve group; the second end of the first thyristor is connected to the first end of the second thyristor to serve as the second connection end K2 of the thyristor valve group.

[0014] In the above scheme, two thyristors are connected in reverse parallel to form a thyristor valve group. N thyristor valve groups connected in series can share the high voltage and solve the voltage withstand problem of a single thyristor or a single group of thyristors.

[0015] Furthermore, the valve group detection module is connected in parallel with the corresponding thyristor valve group. The valve group detection module includes a first isolation optocoupler and a resistor connected in series, and the output terminal of the first isolation optocoupler is connected to the control unit.

[0016] In the above scheme, the valve group detection module is used to detect whether the thyristor valve group is running (e.g., the voltage difference across the thyristor valve group is within the normal range). If the thyristor valve group is running, the first isolation optocoupler in the valve group detection module is turned on, and the transistor detection signal it sends to the control unit is high-level. If the thyristor valve group is not running (e.g., the voltage difference across the thyristor valve group is outside the normal range), the second isolation optocoupler in the valve group detection module is turned off, and the transistor detection signal it sends to the control unit is low-level. Determining the operating status of the thyristor valve group by using the conduction characteristics of the first isolation optocoupler simplifies the circuit complexity, and this method is accurate and error-free, improving the accuracy of thyristor valve group anomaly detection.

[0017] Furthermore, the main controller alternately sends a positive drive trigger signal to the first thyristor and a negative drive trigger signal to the second thyristor through the control unit.

[0018] In the above scheme, the first thyristor and the second thyristor are turned on or off according to the drive trigger signal sent by the main controller. Since the main controller sends positive and negative drive trigger signals alternately, when the main controller sends a positive drive trigger signal, the control unit sends a positive drive trigger signal to the first thyristor, the first thyristor turns on, and the second thyristor turns off; when the main controller sends a negative drive trigger signal, the control unit sends a negative drive trigger signal to the second thyristor, the second thyristor turns on, and the first thyristor turns off.

[0019] Furthermore, each of the drive detection modules includes a positive drive detection unit and a negative drive detection unit;

[0020] The first end of the forward drive detection unit is connected to the control electrode G1 of the first thyristor, the second end of the forward drive detection unit is connected to the first connection terminal K1 of the thyristor valve group, and the third end of the forward drive detection unit is connected to the control unit; the forward drive detection unit sends a forward drive detection signal to the control unit.

[0021] The first end of the negative drive detection unit is connected to the control electrode G2 of the second thyristor, the second end of the negative drive detection unit is connected to the second connection terminal K2 of the thyristor valve group, and the third end of the negative drive detection unit is connected to the control unit; the negative drive detection unit sends a negative drive detection signal to the control unit.

[0022] In the above scheme, a positive drive detection unit is connected to the drive circuit of the first thyristor to detect whether the positive drive trigger signal sent by the main controller reaches the first thyristor; a negative drive detection unit is connected to the drive circuit of the second thyristor to detect whether the negative drive trigger signal sent by the main controller reaches the second thyristor. Therefore, if the positive / negative drive detection unit fails to detect the positive / negative drive trigger signal when the main controller sends it, it indicates a drive triggering abnormality.

[0023] Furthermore, the positive drive detection unit or negative drive detection unit includes a resistor R0 and a second isolation optocoupler; one end of the resistor R0 serves as the first end of the positive drive detection unit or negative drive detection unit, the other end of the resistor R0 is connected to the first input end of the second isolation optocoupler, the second input end of the second isolation optocoupler serves as the second end of the positive drive detection unit or negative drive detection unit, and the output end of the second isolation optocoupler serves as the third end of the positive drive detection unit or negative drive detection unit.

[0024] In the above scheme, the forward drive detection unit and the negative drive detection unit have the same structure. The detection of the positive / negative drive trigger signals is mainly achieved by a second isolation optocoupler. When a positive drive detection signal is detected, the second isolation optocoupler in the forward drive detection unit is turned on and sends a high level to the control unit, indicating that the first thyristor has received the positive drive trigger signal from the main controller. When no positive drive detection signal is detected, the second isolation optocoupler in the forward drive detection unit is turned off and sends a low level to the control unit, indicating that the first thyristor has not received the positive drive trigger signal from the main controller. The negative response is similar and will not be elaborated further. It can be seen that when the thyristor valve group is not running, the corresponding thyristor detection signal is low. However, at this time, it is still impossible to know whether the reason for the thyristor valve group's failure to run is a fault in the thyristor valve group itself or whether it simply did not receive the drive trigger signal. Therefore, by further acquiring the corresponding drive trigger signal of the thyristor valve group and outputting the drive detection signal, the cause of the thyristor valve group's abnormality can be determined.

[0025] A method for online monitoring of thyristor valve assemblies includes the following steps:

[0026] The main controller sends drive trigger signals to each thyristor valve group through the control unit;

[0027] The drive detection module collects the drive trigger signal corresponding to each thyristor valve group, outputs the drive detection signal, and feeds the drive detection signal back to the control unit;

[0028] The valve group detection module detects the pressure difference across each thyristor valve group, outputs a thyristor detection signal, and feeds the thyristor detection signal back to the control unit.

[0029] The control unit feeds back the drive detection signal and the thyristor detection signal to the main controller. The main controller determines whether there is an abnormality in the thyristor valve group based on the drive trigger signal, the drive detection signal, and the thyristor detection signal, and whether the abnormality in the thyristor valve group is caused by the abnormal drive trigger.

[0030] Furthermore, the step of the main controller sending drive trigger signals to each thyristor valve group through the control unit includes:

[0031] The main controller sends drive trigger signals to each thyristor valve group through the control unit; the drive trigger signals include alternating positive drive trigger signals and negative drive trigger signals, the positive drive trigger signal is sent to the first thyristor, and the negative drive trigger signal is sent to the second thyristor.

[0032] Furthermore, the step of the drive detection module acquiring drive detection signals and feeding them back to the control unit includes:

[0033] The drive detection signal includes a positive drive detection signal and a negative drive detection signal;

[0034] If the forward drive detection unit detects the forward drive trigger signal sent to the first thyristor, it sends a high-level forward drive detection signal to the control unit; otherwise, it sends a low-level forward drive detection signal.

[0035] If the negative drive detection unit detects the negative drive trigger signal sent to the second thyristor, it sends a high-level negative drive detection signal to the control unit; otherwise, it sends a low-level signal.

[0036] Furthermore, the step of the valve group detection module acquiring the thyristor detection signal and feeding the thyristor detection signal back to the control unit includes:

[0037] If the valve group detection module detects that the pressure difference across the thyristor valve group is within the normal range, it sends a high-level thyristor detection signal to the control unit; if it detects that the pressure difference across the thyristor valve group is outside the normal range, it sends a low-level thyristor detection signal to the control unit.

[0038] Furthermore, the determination of whether the thyristor valve group is abnormal, and whether the abnormality of the thyristor valve group is caused by a drive triggering abnormality, includes the following situations:

[0039] (1) When the drive trigger signal is low, the drive detection signal is low, and the thyristor detection signal is low, the monitoring result is that the thyristor valve group is not working.

[0040] (2) When the drive trigger signal is low, the drive detection signal is low, and the thyristor detection signal is high, the monitoring result is that the thyristor valve group is abnormally short-circuited, but it is not caused by abnormal drive triggering.

[0041] (3) When the drive trigger signal is low, the drive detection signal is high, and the thyristor detection signal is high, the monitoring result is that the thyristor valve group is abnormally connected and caused by abnormal drive triggering.

[0042] (4) When the drive trigger signal is high, the drive detection signal is high, and the thyristor detection signal is low, the monitoring result is that the thyristor valve group is abnormally open, but it is not caused by abnormal drive triggering.

[0043] (5) When the drive trigger signal is high, the drive detection signal is low, and the thyristor detection signal is low, the monitoring result is that the thyristor valve group is abnormally open, and it is caused by abnormal drive triggering.

[0044] (6) When the drive trigger signal is high, the drive detection signal is high, and the thyristor detection signal is high, the monitoring result is that the thyristor valve group is normally conducting.

[0045] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0046] (1) In the thyristor electric heating system of the present invention, a drive detection module is set in the drive circuit of the thyristor valve group, and a valve group detection module is set in parallel on the thyristor valve group. The thyristor valve group can be judged by outputting the drive detection signal, the thyristor detection signal, and the drive trigger signal, and whether the abnormality is caused by the abnormality of the drive trigger.

[0047] (2) Since the present invention sets up a drive detection module and a valve group detection module for each thyristor valve group in a one-to-one correspondence, when it is determined that the thyristor valve group is abnormal but not caused by drive triggering, the abnormal thyristor valve group can be quickly located through the source of the thyristor detection signal; when it is determined that the thyristor valve group is abnormal and is caused by drive triggering abnormality, the drive triggering abnormality point can be quickly located through the source of the drive detection signal, thereby avoiding further damage. Attached Figure Description

[0048] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0049] Figure 1 This is a schematic diagram of the system connection of the present invention;

[0050] Figure 2 This is a schematic diagram of another embodiment of the valve group detection module of the present invention;

[0051] Figure 3 This is a schematic diagram of the thyristor valve assembly of the present invention when it is not in operation;

[0052] Figure 4 This is a schematic diagram of the thyristor valve group of the present invention under abnormal short circuit.

[0053] Figure 5 This is a schematic diagram illustrating how an abnormal triggering error in the present invention leads to abnormal conduction of the thyristor valve group.

[0054] Figure 6 This is a schematic diagram of the thyristor valve assembly of the present invention under abnormal open circuit conditions.

[0055] Figure 7This is a schematic diagram illustrating an abnormal triggering error in the thyristor valve group, leading to an abnormal open circuit.

[0056] Figure 8 This is a schematic diagram of the thyristor valve group of the present invention when it is normally conducting;

[0057] Figure 9 This is a schematic diagram of the method flow of the present invention. Detailed Implementation

[0058] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0059] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this invention, the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance, or suggesting any such actual relationship or order between these entities or operations. Additionally, the terms "connected," "linked," etc., can refer to a direct connection between elements or an indirect connection via other elements.

[0060] This invention is achieved through the following technical solutions, such as... Figure 1 As shown, a system for online monitoring of thyristor valve group anomalies includes a main controller, a control unit, N thyristor valve groups, N drive detection modules, and N valve group detection modules. N is an integer greater than or equal to 1. If N>1, the N thyristor valve groups are connected in series. Furthermore, one end of the N series-connected thyristor valve groups is connected to the power grid, and the other end is connected to the load.

[0061] The main controller is connected to the control unit and is used to issue drive trigger signals; N thyristor valve groups are respectively connected to the control unit and receive drive trigger signals; N drive detection modules are connected one-to-one with the drive circuits of the N thyristor valve groups and are used to collect the drive trigger signal corresponding to each thyristor valve group and output drive detection signals; N valve group detection modules are connected one-to-one with the N thyristor valve groups and are used to detect the pressure difference across each thyristor valve group and output thyristor detection signals; N drive detection modules are respectively connected to the control unit and are used to feed back the drive detection signals to the control unit; N valve group detection modules are respectively connected to the control unit and are used to feed back the thyristor detection signals to the control unit.

[0062] This solution simultaneously acquires drive trigger signals, drive detection signals, and thyristor detection signals. By combining these signals with an assessment of the thyristor valve group's operating status and drive triggering condition, it can quickly pinpoint the fault location if an abnormality is found in the thyristor valve group itself or caused by a drive triggering anomaly, thus achieving online monitoring. Specifically, the main controller sends drive trigger signals to the thyristor valve groups through the control unit. The drive detection module, located on the thyristor valve group drive circuit, acquires the drive trigger signal corresponding to each thyristor valve group, outputs a drive detection signal, and feeds it back to the control unit. The valve group detection module, connected in parallel with the thyristor valve groups, detects the pressure difference across each thyristor valve group, outputs a thyristor detection signal, and feeds it back to the control unit. The control unit then feeds back the drive detection signal and the thyristor detection signal to the main controller, which uses these signals to determine whether an abnormality exists in the thyristor valve group and whether the abnormality is caused by a drive triggering anomaly.

[0063] Because each thyristor valve group drive circuit has its own drive detection module, and each thyristor valve group has a valve group detection module connected in parallel, the main controller can locate abnormal thyristor valve groups based on the connection relationship between the drive detection module, the valve group detection module, and the thyristor valve group. It can then promptly provide the user with valve group status information, facilitating rapid detection and location of valve group faults, avoiding the risk of output loss of control, reducing the difficulty of troubleshooting related faults, and improving fault handling efficiency. For more details, please continue reading... Figure 1Each thyristor valve group includes a first thyristor and a second thyristor connected in parallel, and a voltage equalization resistor R. Specifically, the first end (cathode) of the first thyristor is connected to the second end (anode) of the second thyristor to form the first connection terminal K1 of the thyristor valve group, and the second end (anode) of the first thyristor is connected to the first end (cathode) of the second thyristor to form the second connection terminal K2 of the thyristor valve group. The first thyristor also has a control electrode G1 (gate), and the second thyristor also has a control electrode G2 (gate).

[0064] Preferred, such as Figure 1 As shown, the valve group detection module includes a first isolation optocoupler and a resistor R1 connected in series. The resistor R1 is a current-limiting resistor. One input pin of the first isolation optocoupler is connected in series with one pin of the current-limiting resistor. The first isolation optocoupler and the current-limiting resistor are connected in parallel across the voltage equalizing resistor R. The two output pins of the first isolation optocoupler are connected to the control unit. The thyristor detection signal fed back by the valve group detection module to the control unit is mainly reflected by identifying the conduction or cutoff of the first isolation optocoupler. When the first isolation optocoupler is on, the thyristor detection signal is high-level; when the first isolation optocoupler is off, the thyristor detection signal is low-level.

[0065] Another implementation method is as follows Figure 2 As shown, each valve group detection module includes a first isolation optocoupler and multiple resistors (R1, R2, R3) connected in series. These resistors can be used as voltage equalizing resistors, and either R1 or R3 can be used as a current-limiting resistor. The two input pins of the first isolation optocoupler are connected in parallel to resistor R2, and the two output pins are connected to the control unit. The thyristor detection signal fed back to the control unit by the valve group detection module is mainly reflected by identifying the conduction or cutoff of the first isolation optocoupler. When the first isolation optocoupler is on, the thyristor detection signal is high; when the first isolation optocoupler is off, the thyristor detection signal is low.

[0066] The main controller sends drive trigger signals to the control unit. These drive trigger signals include alternating positive and negative drive trigger signals. The control unit sends the positive drive trigger signal to the first thyristor of all thyristor valve groups and the negative drive trigger signal to the second thyristor of all thyristor valve groups. For more details, please refer to [link to relevant documentation]. Figure 1The control unit is connected to the thyristor valve groups via high-voltage isolation cables, which include positive and negative high-voltage isolation cables. The positive high-voltage isolation cable is connected to the primary winding of N sets of drive transformers, and the secondary windings of these N sets of drive transformers are connected to the N thyristor valve groups. Specifically, one end of the secondary winding of each drive transformer is connected to the control electrode G1 of the first thyristor, and the other end is connected to the first connection terminal K1 of the first thyristor. The control unit sends positive drive trigger signals to each of the first thyristors through the different drive transformers on the positive high-voltage isolation cables. Similarly, the negative high-voltage isolation cable is connected to the primary winding of N sets of drive transformers, and the secondary windings of these N sets of drive transformers are connected to the N thyristor valve groups. Specifically, one end of the secondary winding of each drive transformer is connected to the control electrode G2 of the second thyristor, and the other end is connected to the second connection terminal K2 of the second thyristor. The control unit sends negative drive trigger signals to each of the second thyristors through the different drive transformers on the negative high-voltage isolation cable.

[0067] Each of the aforementioned drive detection modules includes a forward drive detection unit and a negative drive detection unit with identical structures. Therefore, the drive detection signal output by the drive detection module includes the forward drive detection signal output by the forward drive detection unit and the negative drive detection signal output by the negative drive detection unit. Please continue to the next section. Figure 1 The forward drive detection unit includes a resistor R0 and a second isolation optocoupler. One end of the resistor R0 serves as the first terminal of the forward drive detection unit and is connected to the control electrode G1 of the first thyristor. The other end of the resistor R0 is connected to the first input terminal (first input pin) of the second isolation optocoupler. The second input terminal (second input pin) of the second isolation optocoupler serves as the second terminal of the forward drive detection unit and is connected to the first connection terminal K1 of the thyristor valve group. The output terminal (two output pins) of the second isolation optocoupler serves as the third terminal of the forward drive detection unit and is connected to the control unit. Similarly, the negative drive detection unit also includes a resistor R0 and a second isolation optocoupler. One end of the resistor R0 serves as the first terminal of the negative drive detection unit and is connected to the control electrode G2 of the second thyristor. The other end of the resistor R0 is connected to the first input terminal (first input pin) of the second isolation optocoupler. The second input terminal (second input pin) of the second isolation optocoupler serves as the second terminal of the negative drive detection unit and is connected to the second connection terminal K2 of the thyristor valve group. The output terminal (two output pins) of the second isolation optocoupler serves as the third terminal of the negative drive detection unit and is connected to the control unit. The drive detection signal fed back from the drive detection module to the control unit is mainly reflected by identifying the on or off state of the second isolation optocoupler. When the second isolation optocoupler is on, the drive detection signal is high level, and when the second isolation optocoupler is off, the drive detection signal is low level.

[0068] As shown in Table 1, this solution combines the drive trigger signal, drive detection signal, and thyristor detection signal to determine whether the operating status of the thyristor valve group is abnormal, and whether the abnormality of the thyristor valve group is caused by a drive triggering abnormality. It should be noted that in Table 1, "0" represents a low level and "1" represents a high level. Figures 3 to 8 Solid lines in the diagram represent high level or voltage, while dashed lines represent low level or no voltage.

[0069] Table 1. Anomaly Judgment Table

[0070]

[0071] Combination Figure 3 The grid voltage is maintained at AC output. The main controller sends drive trigger signals to each thyristor valve group through the control unit. Specifically, it alternately sends a positive drive trigger signal to the first thyristor in each thyristor valve group and a negative drive trigger signal to the second thyristor. When the main controller stops sending drive trigger signals (i.e., the drive trigger signal is low), the drive detection unit does not detect the drive trigger signal, so the drive detection signal is low. Because there is no drive trigger signal, the thyristor valve group is not conducting, and the valve group detection module cannot detect the operation of the thyristor valve group, so the thyristor detection signal is low. The entire system also does not output voltage to the load. At this time, the monitoring result is determined to be that the thyristor valve group is not working.

[0072] Combination Figure 4 The grid voltage is maintained at AC output. The main controller sends drive trigger signals to each thyristor valve group through the control unit. Specifically, it alternately sends a positive drive trigger signal to the first thyristor in each thyristor valve group and a negative drive trigger signal to the second thyristor. When the main controller stops sending drive trigger signals (i.e., the drive trigger signal is low), the drive detection unit does not detect a drive trigger signal, so the drive detection signal is low. Although there is no drive trigger signal, the thyristor valve group is conducting, and the valve group detection module detects the operation of the thyristor valve group, so the thyristor detection signal is high. The entire system also outputs voltage to the load. At this time, the monitoring result is judged as an abnormal short circuit in the thyristor valve group. However, this abnormality of the thyristor valve group is not caused by a drive triggering abnormality, but by an abnormality in the thyristor valve group itself. At this time, the main controller can determine which thyristor valve group has an abnormal short circuit by collecting the detection signals of each thyristor. That is, which valve group detection module reports a high level, then the thyristor valve group connected to that valve group detection module has an abnormal short circuit.

[0073] Combination Figure 5The grid voltage is maintained at AC output. The main controller sends drive trigger signals to each thyristor valve group through the control unit. Specifically, it alternately sends a positive drive trigger signal to the first thyristor in each thyristor valve group and a negative drive trigger signal to the second thyristor. When the main controller stops sending drive signals (i.e., the drive trigger signal is low), the drive detection unit can still detect the drive trigger signal, so the drive detection signal is high. Even without a drive trigger signal, the thyristor valve group is conducting, and the valve group detection module detects the operation of the thyristor valve group, so the thyristor detection signal is high. The entire system also outputs voltage to the load. At this time, the monitoring result is that the thyristor valve group is abnormally conducting, and this abnormality is caused by an abnormal drive trigger, not by a malfunction of the thyristor valve group itself. Therefore, the abnormality can be resolved by checking the drive trigger.

[0074] Combination Figure 6 The grid voltage is maintained at AC output. The main controller sends drive trigger signals to each thyristor valve group through the control unit. Specifically, it alternately sends a positive drive trigger signal to the first thyristor in each thyristor valve group and a negative drive trigger signal to the second thyristor. The drive detection unit can detect the drive trigger signal, so the drive detection signal is high. However, the thyristor valve group is cut off, and the valve group detection module detects that the thyristor valve group is not running, so the thyristor detection signal is low. The entire system does not output voltage to the load. At this time, the monitoring result is that the thyristor valve group is abnormally open-circuited. However, this abnormality of the thyristor valve group is not caused by a drive triggering abnormality, but by an abnormality of the thyristor valve group itself. At this time, the main controller can determine which thyristor valve group has an abnormal short circuit by collecting the detection signals of each thyristor. That is, which valve group detection module reports a low level, and the thyristor valve group connected to that valve group detection module is abnormally open-circuited.

[0075] Combination Figure 7 The grid voltage is maintained at AC output. The main controller sends drive trigger signals to each thyristor valve group through the control unit. Specifically, it alternately sends a positive drive trigger signal to the first thyristor in each thyristor valve group and a negative drive trigger signal to the second thyristor. However, the drive detection unit cannot detect the drive trigger signal, so the drive detection signal is low. Furthermore, the thyristor valve group is cut off, and the valve group detection module detects that the thyristor valve group is not operating, so the thyristor detection signal is low. The entire system also does not output voltage to the load. The monitoring result at this point is an abnormal open circuit in the thyristor valve group, and this abnormality is caused by a drive triggering error, not a thyristor valve group malfunction. Therefore, the problem can be resolved by checking the drive triggering.

[0076] Combination Figure 8The grid voltage is maintained at AC output. The main controller sends drive trigger signals to each thyristor valve group through the control unit. Specifically, it alternately sends a positive drive trigger signal to the first thyristor in each thyristor valve group and a negative drive trigger signal to the second thyristor. The drive detection unit can detect the drive trigger signal, so the drive detection signal is high. When the thyristor valve group is turned on, the valve group detection module detects the operation of the thyristor valve group, so the thyristor detection signal is high. The entire system outputs voltage to the load. At this time, the monitoring result is judged as the thyristor valve group is normally turned on, that is, there is no abnormality in the thyristor valve group and the drive trigger is also normal.

[0077] Based on the aforementioned system, this solution also proposes a method for online monitoring of thyristor valve group anomalies; please refer to [link to relevant documentation]. Figure 9 This includes the following steps:

[0078] Step 1: The main controller sends drive trigger signals to each thyristor valve group through the control unit.

[0079] The grid voltage is maintained at AC output. The main controller sends drive trigger signals (i.e., the drive trigger signal is high level) to each thyristor valve group through the control unit. Specifically, it alternately sends a positive drive trigger signal to the first thyristor in each thyristor valve group and a negative drive trigger signal to the second thyristor.

[0080] Step 2: The drive detection module acquires the drive detection signal and feeds it back to the control unit.

[0081] If the drive detection module detects a drive trigger signal, it sends a high-level drive detection signal to the control unit; if it does not detect a drive detection signal, it sends a low-level drive detection signal to the control unit.

[0082] More specifically, if the forward drive detection unit detects the forward drive trigger signal sent to the first thyristor, the forward drive detection signal sent to the control unit is high; otherwise, it is low. If the negative drive detection unit detects the negative drive trigger signal sent to the second thyristor, the negative drive detection signal sent to the control unit is high; otherwise, it is low.

[0083] Step 3: The valve group detection module acquires the thyristor detection signal and feeds it back to the control unit.

[0084] If the valve group detection module detects that the pressure difference across the thyristor valve group is within the normal range, it sends a high-level thyristor detection signal to the control unit; if it detects that the pressure difference across the thyristor valve group is outside the normal range, it sends a low-level thyristor detection signal to the control unit.

[0085] It should be noted that steps 2 and 3 can be performed simultaneously.

[0086] Step 4: The control unit feeds back the drive detection signal and the thyristor detection signal to the main controller. The main controller determines whether there is an abnormality in the thyristor valve group based on the drive trigger signal, the drive detection signal, and the thyristor detection signal, and determines whether the abnormality in the thyristor valve group is caused by the abnormal drive trigger.

[0087] The main controller determines the monitoring results in the following six scenarios:

[0088] (1) See Figure 3 When the drive trigger signal is low, the drive detection signal is low, and the thyristor detection signal is low, the monitoring result is that the thyristor valve group is not working and the system does not output voltage to the load.

[0089] (2) See Figure 4 When the drive trigger signal is low, the drive detection signal is low, and the thyristor detection signal is high, the monitoring result indicates an abnormal short circuit in the thyristor valve group, but not caused by an abnormal drive trigger. The system outputs voltage to the load. At this time, the abnormal thyristor valve group can be located through the valve group detection module where the thyristor detection signal is high.

[0090] (3) Combination Figure 5 When the drive trigger signal is low, the drive detection signal is high, and the thyristor detection signal is high, the monitoring result indicates abnormal conduction of the thyristor valve group, caused by an abnormal drive trigger, resulting in the system outputting voltage to the load. In this case, the abnormal drive trigger can be located using the drive detection module where the drive detection signal is high. Furthermore, since the drive detection signal is divided into positive and negative drive detection signals, the abnormal drive trigger can be located using either a positive or negative drive detection unit where the positive or negative drive detection signal is high. Therefore, when acquiring the level of the "drive detection signal," if either the positive or negative drive detection signal is low, then the drive detection signal is considered low.

[0091] (4) Combination Figure 6 When the drive trigger signal is high, the drive detection signal is high, and the thyristor detection signal is low, the monitoring result indicates an abnormal open circuit in the thyristor valve group, but this is not caused by an abnormal drive trigger. The system does not output voltage to the load. In this case, the abnormal thyristor valve group can be located using the valve group detection module where the thyristor detection signal is low.

[0092] (5) Combination Figure 7When the drive trigger signal is high, the drive detection signal is low, and the thyristor detection signal is low, the monitoring result indicates that the thyristor valve group is abnormally open-circuited, and the system is not outputting voltage to the load due to the abnormal drive trigger. In this case, the abnormal drive trigger can be located through the drive detection module where the drive detection signal is low.

[0093] (6) Combination Figure 8 When the drive trigger signal is high, the drive detection signal is high, and the thyristor detection signal is high, the monitoring result is that the thyristor valve group is conducting normally, and there is no abnormality in the drive trigger.

[0094] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A system for online monitoring of thyristor valve group anomalies, characterized in that, include: The system consists of a main controller, a control unit, N thyristor valve groups, N drive detection modules, and N valve group detection modules, where N is an integer greater than or equal to 1. If N > 1, the N thyristor valve groups are connected in series. The main controller is connected to the control unit and is used to send drive trigger signals; N drive detection modules are connected one-to-one with the drive circuits of N thyristor valve groups to collect the drive trigger signal corresponding to each thyristor valve group and output the drive detection signal. N valve group detection modules are connected one-to-one with N thyristor valve groups to detect the pressure difference across each thyristor valve group and output thyristor detection signals. N drive detection modules are connected to the control unit respectively, and are used to feed back drive detection signals to the control unit; N valve group detection modules are connected to the control unit respectively, and are used to feed back the thyristor detection signal to the control unit. The control unit feeds back the drive detection signal and the thyristor valve group detection signal to the main controller. The main controller determines whether there is an abnormality in the thyristor valve group based on the drive trigger signal, drive detection signal, and thyristor detection signal, and determines whether the abnormality in the thyristor valve group is caused by a drive triggering abnormality.

2. The system for online monitoring of thyristor valve group anomalies according to claim 1, characterized in that, Each of the thyristor valve groups includes a first thyristor, a second thyristor, and a voltage equalizing resistor connected in parallel; the first end of the first thyristor is connected to the second end of the second thyristor to serve as the first connection terminal K1 of the thyristor valve group; the second end of the first thyristor is connected to the first end of the second thyristor to serve as the second connection terminal K2 of the thyristor valve group.

3. The system for online monitoring of thyristor valve group anomalies according to claim 2, characterized in that, The valve group detection module is connected in parallel with the corresponding thyristor valve group. The valve group detection module includes a first isolation optocoupler and a resistor connected in series. The output terminal of the first isolation optocoupler is connected to the control unit.

4. The system for online monitoring of thyristor valve group anomalies according to claim 2, characterized in that, The main controller alternately sends a positive drive trigger signal to the first thyristor and a negative drive trigger signal to the second thyristor through the control unit.

5. The system for online monitoring of thyristor valve group anomalies according to claim 4, characterized in that, Each of the drive detection modules includes a positive drive detection unit and a negative drive detection unit; The first end of the forward drive detection unit is connected to the control electrode G1 of the first thyristor, the second end of the forward drive detection unit is connected to the first connection terminal K1 of the thyristor valve group, and the third end of the forward drive detection unit is connected to the control unit; the forward drive detection unit sends a forward drive detection signal to the control unit. The first end of the negative drive detection unit is connected to the control electrode G2 of the second thyristor, the second end of the negative drive detection unit is connected to the second connection terminal K2 of the thyristor valve group, and the third end of the negative drive detection unit is connected to the control unit; the negative drive detection unit sends a negative drive detection signal to the control unit.

6. A method for online monitoring of thyristor valve group anomalies, based on the system implementation of online monitoring of thyristor valve group anomalies according to any one of claims 1-5, characterized in that, Includes the following steps: The main controller sends drive trigger signals to each thyristor valve group through the control unit; The drive detection module collects the drive trigger signal corresponding to each thyristor valve group, outputs the drive detection signal, and feeds the drive detection signal back to the control unit; The valve group detection module detects the pressure difference across each thyristor valve group, outputs a thyristor detection signal, and feeds the thyristor detection signal back to the control unit. The control unit feeds back the drive detection signal and the thyristor detection signal to the main controller. The main controller determines whether there is an abnormality in the thyristor valve group based on the drive trigger signal, the drive detection signal, and the thyristor detection signal, and whether the abnormality in the thyristor valve group is caused by the abnormal drive trigger.

7. The method for online monitoring of thyristor valve group anomalies according to claim 6, characterized in that, The step of the main controller sending drive trigger signals to each thyristor valve group through the control unit includes: The main controller sends drive trigger signals to each thyristor valve group through the control unit; the drive trigger signals include alternating positive drive trigger signals and negative drive trigger signals, the positive drive trigger signal is sent to the first thyristor, and the negative drive trigger signal is sent to the second thyristor.

8. The method for online monitoring of thyristor valve group anomalies according to claim 7, characterized in that, The steps of the drive detection module acquiring the drive trigger signal corresponding to each thyristor valve group, outputting the drive detection signal, and feeding the drive detection signal back to the control unit include: The drive detection signal includes a positive drive detection signal and a negative drive detection signal; If the forward drive detection unit detects the forward drive trigger signal sent to the first thyristor, it sends a high-level forward drive detection signal to the control unit; otherwise, it sends a low-level forward drive detection signal. If the negative drive detection unit detects the negative drive trigger signal sent to the second thyristor, it sends a high-level negative drive detection signal to the control unit; otherwise, it sends a low-level signal.

9. The method for online monitoring of thyristor valve group anomalies according to claim 8, characterized in that, The steps of the valve group detection module detecting the pressure difference across each thyristor valve group, outputting a thyristor detection signal, and feeding the thyristor detection signal back to the control unit include: If the valve group detection module detects that the pressure difference across the thyristor valve group is within the normal range, it sends a high-level thyristor detection signal to the control unit; if it detects that the pressure difference across the thyristor valve group is outside the normal range, it sends a low-level thyristor detection signal to the control unit.

10. The method for online monitoring of thyristor valve group anomalies according to claim 9, characterized in that, The determination of whether there is an abnormality in the thyristor valve group, and whether the abnormality in the thyristor valve group is caused by a drive triggering abnormality, includes the following situations: (1) When the drive trigger signal is low, the drive detection signal is low, and the thyristor detection signal is low, the monitoring result is that the thyristor valve group is not working. (2) When the drive trigger signal is low, the drive detection signal is low, and the thyristor detection signal is high, the monitoring result is that the thyristor valve group is abnormally short-circuited, but it is not caused by abnormal drive triggering. (3) When the drive trigger signal is low, the drive detection signal is high, and the thyristor detection signal is high, the monitoring result is that the thyristor valve group is abnormally connected and caused by abnormal drive triggering. (4) When the drive trigger signal is high, the drive detection signal is high, and the thyristor detection signal is low, the monitoring result is that the thyristor valve group is abnormally open, but it is not caused by abnormal drive triggering. (5) When the drive trigger signal is high, the drive detection signal is low, and the thyristor detection signal is low, the monitoring result is that the thyristor valve group is abnormally open, and it is caused by abnormal drive triggering. (6) When the drive trigger signal is high, the drive detection signal is high, and the thyristor detection signal is high, the monitoring result is that the thyristor valve group is normally conducting.

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