Method and device for monitoring thyristor-level component in converter valve, electronic equipment and storage medium

Abstract

The invention provides a method and device for monitoring thyristor-level components in a converter valve, electronic equipment and a storage medium, and relates to the technical field of converter valve online monitoring. The method comprises the following steps: collecting voltages at two ends of each thyristor level; determining the voltage peak value of the voltage at the two ends of each thyristor level in a set period; calculating the ratio of the voltage peak value of the voltage at the two ends of each thyristor level to the average value of the voltage peak values of the voltage at the two ends of N thyristor levels in the converter valve; and according to the calculated voltage peak value ratio of each thyristor level, determining the use performance of the thyristor level component in the thyristor level. Voltage at the two ends of each thyristor level in the converter valve is collected in real time, a voltage peak value is calculated regularly and compared with the average value of the voltage peak values at the two ends of all the thyristor levels in the converter valve, and the use performance of thyristor level components is determined.

Description

Technical Field

[0001] The present application relates to the technical field of online monitoring of converter valves, and in particular to a method and device, electronic equipment and storage medium for monitoring thyristor-level components in converter valves. Background Art

[0002] The converter valve is the core component of high-voltage direct current transmission technology, and its reliable operation is the key to the safe operation of the system. The core functional device of the converter valve is the thyristor. Each thyristor is equipped with voltage balancing, damping, trigger control and protection, forming a thyristor stage. The thyristor stage mainly includes thyristors, damping capacitors, damping resistors, voltage balancing resistors, thyristor trigger units and other components. The above components will age and have abnormal device parameters if they are subjected to voltage, current, temperature and other stresses for a long time.

[0003] According to the operating experience of high-voltage converter valves, the thyristor-level components of converter valves that have been in operation for a long time have the following common abnormalities:

[0004] (1) Thyristor leakage current increases;

[0005] (2) The damping capacitor value decreases;

[0006] (3) The resistance value of the voltage-equalizing resistor increases.

[0007] The above anomalies will affect the reliable operation of the converter valve when the parameters exceed the allowable use range of the components, but the current monitoring system of the converter valve cannot feedback the above anomalies. Therefore, it is necessary to reasonably monitor the status of thyristor-level components to avoid problems.

[0008] Currently, converter valves are regularly inspected and tested, and the thyristor-level functions are spot-checked, usually at 1 / 3 of each year. Functional testing cannot restore the comprehensive stress on the thyristor level when the converter valve is running, and the test results often cannot effectively reflect the actual status of the thyristor-level components; functional testing is an offline test, and it is impossible to detect abnormalities of thyristor-level components in time, and then take reasonable measures to prevent abnormal defects from expanding and escalating.

[0009] The paper "Online Monitoring Technology of Thyristor-Level High-Voltage Direct Current Transmission Converter Valve" proposes to calculate the parameters of damping resistor, damping capacitor and static voltage-equalizing resistor by adding multiple voltage and current measurement points; Patent CN201610607211.0 A method for online monitoring of dynamic parameters of HVDC thyristor-level DC voltage-equalizing resistor, proposes to connect a current acquisition node in series in the DC voltage-equalizing loop to realize real-time acquisition of the current flowing through the DC voltage-equalizing resistor of this branch; by arranging a voltage acquisition node on the positive side of the thyristor in the DC voltage-equalizing circuit, the DC voltage-equalizing resistor voltage is obtained and transmitted locally to the trigger board for calculation; Patent CN201610603359.7 A method for online monitoring of dynamic parameters of HVDC thyristor-level DC voltage-equalizing resistor The online monitoring method of dynamic parameters of the damping resistor proposes to set voltage collection points and current collection points in the damping branch, and calculate the resistance value of the damping resistor based on the voltage and current; Patent CN201610607197.4 A method for monitoring the state of damping capacitors in high-voltage direct current transmission, proposes to determine the continuous differential equation for solving the damping capacitor value, discretize the continuous differential equation for solving the damping capacitor, and calculate the damping capacitor value according to the discretized capacitor voltage and current sampling values; Patent CN201510736471.3 A method for online monitoring of dynamic parameters of HVDC thyristor-level damping circuit, proposes to use the method of detecting the time constant RC value of the damping circuit to perform online monitoring of the damping circuit fault. According to the switching characteristics of the thyristor in the damping circuit, the circuit topology equivalence analysis and reduction are carried out, and an equivalent circuit with the same characteristics is designed, and then it is sorted into an input response equation group according to the characteristic change parameters, and the dynamic parameters to be monitored are reduced to equivalent variables, and then the feasible solution of RC is calculated in real time;

[0010] The above-mentioned papers and patents calculate the parameters of the damping resistor, damping capacitor and static equalizing resistor by adding voltage and current measurement points in different branches, thereby forming an online monitoring method and system; however, the capacitor and resistor monitoring methods mentioned in the above-mentioned papers and patents require the addition of multiple sensors, the calculation methods are complex, and the implementation is difficult. The current routine maintenance test work cannot accurately and timely reflect the status of thyristor-level components, the online monitoring method is complex, and the online monitoring and performance evaluation functions of the thyristor cannot be realized. Summary of the invention

[0011] In order to solve at least one of the above problems, the present application proposes a method and device, an electronic device and a storage medium for monitoring thyristor-level components in a converter valve.

[0012] According to the first aspect of the present application, at least one embodiment of the present application provides a method for monitoring thyristor-level components in a converter valve, wherein the converter valve includes N thyristor stages, N is an integer greater than or equal to 1, each of the thyristor stages includes one or more thyristor-level components, and the thyristor-level components include a thyristor, a voltage-equalizing resistor, and a damping capacitor. The method includes: collecting the voltage across each of the thyristor stages; determining the voltage peak value of the voltage across each of the thyristor stages within a set period; calculating the ratio of the voltage peak value of the voltage across each of the thyristor stages to the average voltage peak value of the voltage across the N thyristor stages in the converter valve; and determining the performance of the thyristor-level components in the thyristor stage based on the calculated voltage peak value ratio of each of the thyristor stages.

[0013] For example, in some embodiments of the present application, determining the voltage peak value of the voltage across each of the thyristor stages within a set period includes:

[0014] The voltage sampling values ​​at both ends of each thyristor stage at each moment in the set period are counted; and the voltage peak value of the voltage at both ends of each thyristor stage in the set period is determined according to the following formula:

[0015] Upi=Max(Ui (T) 、Ui (T-1) 、Ui (T-2) …Ui (T-m) )

[0016] Uni=Min(Ui (T) 、Ui (T-1) 、Ui (T-2) …Ui (T-m) )

[0017] Wherein, Upi is the positive peak value of the voltage across the i-th thyristor stage in the set period, Uni is the negative peak value of the voltage across the i-th thyristor stage in the set period, the set period includes m+1 moments, m is an integer greater than or equal to 1, Ui (T) is the voltage sampling value of the i-th thyristor stage at time T, Ui (T-m) is the sampling value of the voltage across the i-th thyristor stage at time Tm, and the value range of i is 1~N.

[0018] For example, in some embodiments of the present application, the calculating the ratio of the voltage peak value of the voltage across each thyristor stage to the voltage peak value average value of the voltage across N thyristor stages in the converter valve comprises: calculating the ratio of the voltage peak value of the voltage across each thyristor stage to the voltage peak value average value of the voltage across N thyristor stages in the converter valve according to the following formula:

[0019] Kpi=Upi×N / (Up1+Up2+…+UpN)

[0020] Kni=Uni×N / (Un1+Un2+…+UnN)

[0021] Among them, Kpi is the ratio of the forward voltage peak value at both ends of the i-th thyristor stage to the average value of the forward voltage peak value at both ends of the N thyristor stages in the converter valve, and Kni is the ratio of the negative voltage peak value at both ends of the i-th thyristor stage to the average value of the negative voltage peak value at both ends of the N thyristor stages in the converter valve.

[0022] For example, in some embodiments of the present application, the use performance of the thyristor-level components in the thyristor level is determined based on the calculated voltage peak ratio of each of the thyristor levels, including: when the Kpi of the i-th thyristor level is greater than a preset first threshold and the Kni is less than a preset second threshold, determining that the thyristor of the i-th thyristor level is abnormal.

[0023] For example, in some embodiments of the present application, the performance of the thyristor-level components in the thyristor level is determined based on the calculated voltage peak ratio of each of the thyristor levels, including: when the Kpi of the i-th thyristor level is greater than a preset third threshold and the Kni is greater than a preset fourth threshold, determining that the damping capacitance of the i-th thyristor level is abnormal.

[0024] For example, in some embodiments of the present application, the performance of the thyristor-level components in the thyristor stage is determined based on the calculated voltage peak ratio of each of the thyristor stages, including: when the Kpi of the i-th thyristor stage is less than the preset fifth threshold and the Kni is less than the preset sixth threshold, determining that the equalizing resistance of the i-th thyristor stage is abnormal.

[0025] According to the second aspect of the present application, at least one embodiment of the present application provides a device for monitoring thyristor-level components in a converter valve, which is used to execute a method as described in any one of the first aspects, and the device includes: N thyristor-level voltage sensors, which are correspondingly connected to the N thyristor levels and are respectively used to collect the voltages across the N thyristor levels; an intelligent monitoring device, which is connected to the N thyristor-level voltage sensors and is used to determine the voltage peak value of the voltage across each thyristor level in the first cycle; it is also used to calculate the ratio of the voltage peak value of the voltage across each thyristor level to the voltage peak average value of the voltage across the N thyristor levels in the converter valve; and it is used to determine the usage performance of the thyristor-level components in the thyristor level according to the calculated voltage peak value ratio of each thyristor level.

[0026] For example, in some embodiments of the present application, the intelligent monitoring device is further used to: count the voltage sampling values ​​across each thyristor stage at each moment in the first cycle; and determine the voltage peak value of the voltage across each thyristor stage in the first cycle according to the following formula:

[0027] Upi=Max(Ui (T) 、Ui (T-1) 、Ui (T-2) …Ui (T-m) )

[0028] Uni=Min(Ui (T) 、Ui (T-1) 、Ui (T-2) …Ui (T-m) )

[0029] Wherein, Upi is the positive peak value of the voltage across the i-th thyristor stage in the first cycle, Uni is the negative peak value of the voltage across the i-th thyristor stage in the first cycle, and Ui (T) is the voltage sampling value of the i-th thyristor stage at time T, Ui (T-m) is the sampling value of the voltage across the i-th thyristor stage at time Tm, and the value range of i is 1-N.

[0030] According to the third aspect of the present application, at least one embodiment of the present application provides an electronic device, comprising: one or more processors; a memory for storing one or more programs; when the one or more programs are executed by the one or more processors, the one or more processors execute a method as described in any one of the first aspects.

[0031] According to a fourth aspect of the present application, at least one embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon, wherein the program, when executed by a processor, implements the method as described in any one of the first aspects.

[0032] The present application provides a method and device for monitoring thyristor-level components in a converter valve, which determines the performance of the thyristor-level components by collecting the voltage across each thyristor level in the converter valve in real time, regularly calculating the voltage peak value, and comparing it with the average value of the voltage peak value across all thyristor levels in the converter valve; compared with the performance evaluation method of performing functional tests on thyristor levels during current routine maintenance, the performance evaluation is more accurate and timely, and based on the above method, a maintenance strategy for the converter valve can be formulated in a targeted manner, thereby realizing lean maintenance of the converter valve and avoiding the expansion and escalation of abnormal defects.

[0033] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] By describing in detail exemplary embodiments thereof with reference to the accompanying drawings, the above and other objects, features and advantages of the present application will become more apparent. The accompanying drawings described below are only some embodiments of the present application, and are not intended to limit the present application.

[0035] Figure 1 A flow chart showing a method for monitoring thyristor-level components in a converter valve according to an exemplary embodiment;

[0036] Figure 2 A schematic diagram showing a thyristor stage of a converter valve according to an exemplary embodiment;

[0037] Figure 3 A schematic diagram showing the peak voltage across a thyristor stage of an exemplary embodiment;

[0038] Figure 4 A schematic diagram showing an exemplary embodiment of a device for monitoring thyristor-level components in a converter valve;

[0039] Figure 5 A structural diagram of an electronic device provided by the present application is shown. DETAILED DESCRIPTION

[0040] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be comprehensive and complete and will fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar parts, and thus their repeated description will be omitted.

[0041] The described features, structures or characteristics may be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or more of these specific details, or other modes, components, materials, devices, etc. may be adopted. In these cases, known structures, methods, devices, implementations, materials or operations will not be shown or described in detail.

[0042] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0043] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0044] Those skilled in the art will appreciate that the drawings are merely schematic diagrams of example embodiments, and the modules or processes in the drawings are not necessarily necessary for implementing the present application, and therefore cannot be used to limit the scope of protection of the present application.

[0045] Figure 1 A flow chart of a method for monitoring thyristor-level components in a converter valve according to an exemplary embodiment is shown.

[0046] According to an exemplary embodiment, the thyristor stage is a basic component unit of the converter valve, and the converter valve includes N thyristor stages, where N is an integer greater than or equal to 1. Figure 2 As shown. Each thyristor stage includes a thyristor, a damping capacitor C, a damping resistor Rc and a voltage-equalizing resistor Rd. Figure 2 The converter valve shown is composed of N thyristor stages connected in series.

[0047] like Figure 1 As shown, the method for monitoring thyristor-level components in a converter valve includes steps S10-S40, and the thyristor-level components include thyristors, grading resistors, and damping capacitors:

[0048] In step S10: the voltage across each thyristor stage is collected.

[0049] According to an example embodiment, the voltage across the thyristor stage is Figure 2 The voltage on both sides of the thyristor in the middle is collected in real time, and the voltage Ui on both sides of the Ti (i = 1-N) thyristor is collected in real time. The sampling rate can be 10kHz.

[0050] In step S20: the voltage peak value of the voltage across each thyristor stage within a set period is determined.

[0051] According to an example embodiment, determining a voltage peak value of the voltage across each thyristor stage within a set period includes:

[0052] S201, counting the voltage sampling values ​​across each thyristor stage at each moment within a set period.

[0053] S202, determining the voltage peak value of the voltage across each thyristor stage within the set period according to the following formula:

[0054] Upi=Max(Ui (T) 、Ui (T-1) 、Ui (T-2) …Ui (T-m) )

[0055] Uni=Min(Ui (T) 、Ui (T-1) 、Ui (T-2) …Ui (T-m) )

[0056] Among them, the voltage peak value includes positive peak value and negative peak value, Upi is the positive peak value of the voltage at both ends of the i-th thyristor stage in the set cycle, Uni is the negative peak value of the voltage at both ends of the i-th thyristor stage in the set cycle, Ui (T) is the voltage sampling value of the i-th thyristor stage at time T, Ui (T-m) is the sampling value of the voltage across the i-th thyristor stage at time Tm, and the value range of i is 1 to N. There are m+1 voltage sampling values ​​in the setting cycle, m is an integer greater than or equal to 1, and the typical value of a setting cycle is 20ms. Max() is the maximum value of all the data in the brackets, and Min() is the minimum value of all the data in the brackets. The value range of i is 0 to N.

[0057] Figure 3 Schematic diagram showing the voltage peak across a thyristor stage of an exemplary embodiment.

[0058] According to the exemplary embodiment, the abscissa is time, the ordinate is the voltage Ui across the i-th thyristor stage, one cycle is 20ms, and according to the above method, Upi=Ui (T-2) 、Uni=Ui (T-13) .

[0059] In step S30: the ratio of the voltage peak value of the voltage across each thyristor stage to the average value of the voltage peak values ​​of the voltage across N thyristor stages in the converter valve is calculated.

[0060] According to an example embodiment, calculating a ratio of a voltage peak value of a voltage across each thyristor stage to an average value of voltage peak values ​​of voltages across N thyristor stages in the converter valve includes:

[0061] Kpi=Upi×N / (Up1+Up2+…+UpN)

[0062] Kni=Uni×N / (Un1+Un2+…+UnN)

[0063] Among them, Kpi is the ratio of the forward voltage peak value across the i-th thyristor stage to the average value of the forward voltage peak value across the N thyristor stages in the converter valve, and Kni is the ratio of the negative voltage peak value across the i-th thyristor stage to the average value of the negative voltage peak value across the N thyristor stages in the converter valve. N is the number of thyristor stages in the converter valve, and the value range of i is 1 to N.

[0064] In step S40: according to the calculated voltage peak ratio of each thyristor stage, the performance of the thyristor stage components in the thyristor stage is determined.

[0065] According to an example embodiment, when Kpi ​​of the i-th thyristor stage is greater than a preset first threshold and Kni is less than a preset second threshold, it is determined that the thyristor of the i-th thyristor stage is abnormal. The typical value of the first threshold is 1.1, and the typical value of the second threshold is 1.0.

[0066] According to an example embodiment, when Kpi ​​of the i-th thyristor stage is greater than a preset third threshold and Kni is greater than a preset fourth threshold, it is determined that the damping capacitance of the i-th thyristor stage is abnormal. The typical value of the third threshold is 1.1, and the typical value of the fourth threshold is 1.1.

[0067] According to an example embodiment, when Kpi ​​of the i-th thyristor stage is less than a preset fifth threshold value and Kni is less than a preset sixth threshold value, it is determined that the grading resistance of the i-th thyristor stage is abnormal. The typical value of the fifth threshold value is 0.9, and the typical value of the sixth threshold value is 0.9.

[0068] According to an exemplary embodiment, when Kpi ​​and Kni of the i-th thyristor stage are not within the above three ranges, it is determined that the components of the i-th thyristor stage are normal.

[0069] The value range of the above i is 1 to N.

[0070] Figure 4 A schematic diagram of a device for monitoring thyristor-level components in a converter valve according to an exemplary embodiment is shown.

[0071] According to an exemplary embodiment, a single converter valve has N thyristor stages, and each thyristor stage is configured with a thyristor stage voltage sensor, which is respectively used to monitor the voltage across the thyristor stage in real time.

[0072] Each single converter valve is equipped with an intelligent monitoring device, which is connected to N thyristor-level voltage sensors and is used to receive the voltage data of the thyristor level sent by the thyristor-level voltage sensor, and is also used to determine the voltage peak value of the voltage across each thyristor level in the first cycle; it is also used to calculate the ratio of the voltage peak value of the voltage across each thyristor level to the average value of the voltage peak value of the voltage across the N thyristor levels in the converter valve; and it is used to determine the service performance of the thyristor-level components in the thyristor level according to the calculated voltage peak value ratio of each thyristor level.

[0073] Among them, the device for real-time monitoring of thyristor-level components is used to execute the method for real-time monitoring of thyristor-level components as described above, so it will not be described in detail here.

[0074] The present application provides a method and device for monitoring thyristor-level components in a converter valve, which determines the performance of the thyristor-level components by collecting the voltage across each thyristor level in the converter valve in real time, regularly calculating the voltage peak value, and comparing it with the average value of the voltage peak value across all thyristor levels in the converter valve; compared with the performance evaluation method of performing functional tests on thyristor levels during current routine maintenance, the performance evaluation is more accurate and timely, and based on the above method, a maintenance strategy for the converter valve can be formulated in a targeted manner, thereby realizing lean maintenance of the converter valve and avoiding the expansion and escalation of abnormal defects.

[0075] Figure 5 A structural diagram of an electronic device provided by the present application is shown.

[0076] See also Figure 5 , Figure 5 An electronic device is provided, comprising a processor and a memory. The memory stores computer instructions. When the computer instructions are executed by the processor, the processor executes the computer instructions to achieve the following Figure 1 The method and refinement scheme shown.

[0077] It should be understood that the above-mentioned device embodiments are only illustrative, and the device disclosed in the present application can also be implemented in other ways. For example, the division of units / modules in the above-mentioned embodiments is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units, modules or components can be combined, or can be integrated into another system, or some features can be ignored or not executed.

[0078] In addition, unless otherwise specified, each functional unit / module in each embodiment of the present application may be integrated into one unit / module, each unit / module may exist physically separately, or two or more units / modules may be integrated together. The above-mentioned integrated unit / module may be implemented in the form of hardware or in the form of a software program module.

[0079] If the integrated unit / module is implemented in the form of hardware, the hardware may be a digital circuit, an analog circuit, etc. The physical implementation of the hardware structure includes but is not limited to transistors, memristors, etc. Unless otherwise specified, the processor or chip may be any appropriate hardware processor, such as CPU, GPU, FPGA, DSP, and ASIC, etc. Unless otherwise specified, the on-chip cache, off-chip memory, and storage may be any appropriate magnetic storage medium or magneto-optical storage medium, such as Resistive Random Access Memory (RRAM), Dynamic Random Access Memory (DRAM), Static Random Access Memory (SRAM), Enhanced Dynamic Random Access Memory (EDRAM), High-Bandwidth Memory (HBM), Hybrid Memory Cube (HMC), etc.

[0080] If the integrated unit / module is implemented in the form of a software program module and sold or used as an independent product, it can be stored in a computer-readable memory. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a memory and includes several instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the various embodiments of the present disclosure. The aforementioned memory includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or optical disk, etc. Various media that can store program codes.

[0081] The present application also provides a non-transitory computer storage medium storing a computer program. When the computer program is executed by multiple processors, the processors execute the following Figure 1 The method and refinement scheme shown.

[0082] It should be clearly understood that the present application describes how to form and use specific examples, but the present application is not limited to any details of these examples. On the contrary, based on the teaching of the content disclosed in the present application, these principles can be applied to many other embodiments.

[0083] In addition, it should be noted that the above figures are only schematic illustrations of the processes included in the method according to the exemplary embodiments of the present application, and are not intended to be limiting. It is easy to understand that the processes shown in the above figures do not indicate or limit the time sequence of these processes. In addition, it is also easy to understand that these processes can be performed synchronously or asynchronously, for example, in multiple modules.

[0084] The exemplary embodiments of the present application are specifically shown and described above. It should be understood that the present application is not limited to the detailed structures, configurations or implementations described herein; on the contrary, the present application is intended to cover various modifications and equivalent configurations included in the spirit and scope of the appended claims.

Claims

1. A method for monitoring thyristor-level components in a converter valve, characterized in that: The converter valve includes N thyristor stages, where N is an integer greater than or equal to 1, each thyristor stage includes one or more thyristor stage components, and the thyristor stage components include a thyristor, a grading resistor, and a damping capacitor. The method includes: collecting the voltage across each of the thyristor stages; determining a voltage peak value of the voltage across each of the thyristor stages within a set period; Calculating a ratio of a voltage peak value of a voltage across each of the thyristor stages to an average value of voltage peak values ​​of a voltage across N thyristor stages in the converter valve; The performance of the thyristor-level components in the thyristor level is determined according to the calculated voltage peak ratio of each thyristor level.

2. The method according to claim 1, characterized in that Determining the voltage peak value of the voltage across each of the thyristor stages within a set period includes: Counting the voltage sampling values ​​at both ends of each thyristor stage at each moment in the set period; The voltage peak value of the voltage across each of the thyristor stages within the set period is determined according to the following formula: Upi = Max (Ui (T) , Ui (T-1) , Ui (T-2) …Ui (T-m) ) Uni=Min(Ui (T) 、Ui (T-1) 、Ui (T-2) …Ui (T-m) ) Wherein, Upi is the positive peak value of the voltage across the i-th thyristor stage in the set period, Uni is the negative peak value of the voltage across the i-th thyristor stage in the set period, the set period includes m+1 moments, m is an integer greater than or equal to 1, Ui (T) is the voltage sampling value of the i-th thyristor stage at time T, Ui (T-m) is the sampling value of the voltage across the i-th thyristor stage at time Tm, and the value range of i is 1~N.

3. The method according to claim 2, characterized in that The calculating the ratio of the voltage peak value of the voltage across each thyristor stage to the average voltage peak value of the voltage across N thyristor stages in the converter valve comprises: The ratio of the voltage peak value of the voltage across each thyristor stage to the average voltage peak value of the voltage across N thyristor stages in the converter valve is calculated according to the following formula: Kpi=Upi×N / (Up1+Up2+…+UpN) Kni=Uni×N / (Un1+Un2+…+UnN) Among them, Kpi is the ratio of the forward voltage peak value at both ends of the i-th thyristor stage to the average value of the forward voltage peak value at both ends of the N thyristor stages in the converter valve, and Kni is the ratio of the negative voltage peak value at both ends of the i-th thyristor stage to the average value of the negative voltage peak value at both ends of the N thyristor stages in the converter valve.

4. The method according to claim 3, characterized in that Determining the performance of thyristor-level components in the thyristor level according to the calculated voltage peak ratio of each thyristor level includes: When Kpi ​​of the i-th thyristor stage is greater than a preset first threshold value and Kni is less than a preset second threshold value, it is determined that the thyristor of the i-th thyristor stage is abnormal.

5. The method according to claim 3, characterized in that Determining the performance of thyristor-level components in the thyristor level according to the calculated voltage peak ratio of each thyristor level includes: When Kpi ​​of the i-th thyristor stage is greater than a preset third threshold value and Kni is greater than a preset fourth threshold value, it is determined that the damping capacitance of the i-th thyristor stage is abnormal.

6. The method according to claim 3, characterized in that Determining the performance of thyristor-level components in the thyristor level according to the calculated voltage peak ratio of each thyristor level includes: When Kpi ​​of the i-th thyristor stage is less than a preset fifth threshold value and Kni is less than a preset sixth threshold value, it is determined that the balancing resistance of the i-th thyristor stage is abnormal.

7. A device for monitoring thyristor-level components in a converter valve, characterized in that: For executing the method according to any one of claims 1 to 6, the device comprises: N thyristor-level voltage sensors are connected to the N thyristor levels correspondingly and are used to collect voltages at both ends of the N thyristor levels respectively; An intelligent monitoring device is connected to the N thyristor-level voltage sensors, and is used to determine the voltage peak value of the voltage across each thyristor level in the first cycle; is also used to calculate the ratio of the voltage peak value of the voltage across each thyristor level to the average voltage peak value of the voltage across the N thyristor levels in the converter valve; and is used to determine the performance of the thyristor-level components in the thyristor level according to the calculated voltage peak value ratio of each thyristor level.

8. The device according to claim 7, characterized in that The intelligent monitoring device is also used for: Counting the voltage sampling values ​​across each of the thyristor stages at each moment in the first cycle; and The peak voltage of the voltage across each of the thyristor stages in the first cycle is determined according to the following formula: Upi = Max (Ui (T) , Ui (T-1) , Ui (T-2) …Ui (T-m) ) Uni=Min(Ui (T) 、Ui (T-1) 、Ui (T-2) …Ui (T-m) ) Wherein, Upi is the positive peak value of the voltage across the i-th thyristor stage in the first cycle, Uni is the negative peak value of the voltage across the i-th thyristor stage in the first cycle, and Ui (T) is the voltage sampling value of the i-th thyristor stage at time T, Ui (T-m) is the sampling value of the voltage across the i-th thyristor stage at time Tm, and the value range of i is 1~N.

9. An electronic device, characterized in that: include: one or more processors; A memory for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors execute the method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

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