Resistance value on-line monitoring device and method of converter valve thyristor level circuit

Abstract

The invention discloses an online monitoring device and method for the resistance value of a converter valve thyristor level circuit. The online monitoring device comprises a trigger monitoring board card and diagnosis early warning equipment which are connected with each other, the trigger monitoring board card is connected in series with a resistor of the thyristor level circuit, and is used for monitoring the duration of the sampling resistor voltage rising from a set first threshold value to a set second threshold value, and transmitting the duration to the diagnosis early warning device; the diagnosis and early warning equipment is used for calculating the resistance of the thyristor-level circuit based on the duration and judging whether to give an alarm based on the duration and the resistance of the thyristor-level circuit; wherein the first threshold value is smaller than the second threshold value. According to the invention, the trigger monitoring board card monitors the duration of the sampling resistor voltage rising from the set first threshold value to the set second threshold value, and then the diagnosis early warning device judges whether to give an alarm or not based on the duration, so that the DC voltage-sharing resistor is monitored simply and effectively, and the reliability of the DC voltage-sharing resistor is improved. And the system has the advantages of few acquired signals, no need of measuring high-voltage signals, no need of transforming an original circuit and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of power generation and power transmission and transformation, and in particular to an online monitoring device and method for the resistance value of a thyristor-level circuit of a converter valve. Background Art

[0002] As the core equipment of UHV DC transmission, UHV DC converter valve is the core functional unit for realizing AC / DC power conversion. The converter valve is composed of hundreds or thousands of thyristor-level circuits. The thyristor-level circuits of different converter valve manufacturers are not the same, but they are all composed of thyristors, resistors, capacitors and trigger monitoring boards. Figure 1 It is one of the thyristor level circuits. The trigger monitoring board is connected to the valve base electronic equipment through optical fiber. Its main functions include 1) receiving the trigger command of the valve base electronic equipment and triggering the thyristor; 2) monitoring the thyristor level status and sending a feedback signal to the valve base electronic equipment. Some manufacturers will Figure 1 The resistor in the red dashed box is called the DC voltage balancing resistor, and this name is used in this article.

[0003] The converter valve can work in two working conditions: rectification and inversion. Under the two working conditions, the voltage waveform of the DC voltage equalizing resistor is shown in Figure 2(a) and Figure 2(b). In a short period of time near the zero crossing point, the voltage changes in a sinusoidal manner, as shown in the two dotted lines in the figure.

[0004] Currently, there is a lack of online monitoring methods for the resistance value of DC voltage-equalizing resistors. Conventional resistance monitoring methods require monitoring the voltage across the resistor and the current flowing through the resistor, and the voltage divided by the current is the resistance value. However, this method is not suitable for UHV converter valves, because under normal operating conditions, the voltage across the thyristor will reach more than 3kV, the acquisition of high voltage signals will increase the complexity of the system, and the introduction of high voltage into the monitoring board will also increase the risk of failure. Summary of the invention

[0005] In order to solve the problem that the prior art lacks online monitoring means for the resistance value of the DC voltage balancing resistor, the present invention proposes an online monitoring device for the resistance value of the thyristor-level circuit of a converter valve, comprising:

[0006] Interconnected trigger monitoring boards and diagnostic warning equipment;

[0007] The trigger monitoring board is connected in series with the resistor of the thyristor-level circuit, and is used to monitor the time length for the sampling resistor voltage to rise from a set first threshold value to a set second threshold value, and transmit the time length to the diagnosis and early warning device;

[0008] The diagnostic warning device is used to calculate the resistance of the thyristor-level circuit based on the time length, and determine whether to alarm based on the time length and the resistance of the thyristor-level circuit;

[0009] The first threshold is smaller than the second threshold.

[0010] Optionally, the trigger monitoring board includes: a sampling resistor, a first comparison circuit, a second comparison circuit and a timing circuit;

[0011] The sampling resistor is connected in series with the resistor of the thyristor-level circuit;

[0012] The input ends of the first comparison circuit and the second comparison circuit are connected between the sampling resistor and the resistor, and the output ends of the first comparison circuit and the second comparison circuit are both connected to the timing circuit;

[0013] The first comparison circuit and the second comparison circuit are used to compare with the sampling resistor voltage respectively, and if it is less than the sampling resistor voltage, output a rising edge to the timing circuit, otherwise continue to judge;

[0014] The timing circuit is connected to the diagnosis and early warning device, and is used for timing based on the rising edge interval output by the first comparison circuit and the second comparison circuit, and sending the timing as a monitoring value to the diagnosis and early warning device.

[0015] Optionally, the diagnostic and early warning device includes valve base electronic equipment.

[0016] Optionally, the diagnostic and early warning device is specifically used for:

[0017] The resistance of the thyristor-level circuit is obtained based on the relationship between the time length during which the sampling resistor voltage increases from a set first threshold value to a set second threshold value and the resistance of the thyristor-level circuit;

[0018] When the resistance of the thyristor-level circuit is higher than a preset high threshold, or lower than a preset low threshold, an alarm message is issued;

[0019] Whether to issue an alarm message is determined based on the time length during which the sampling resistor voltage increases from a set first threshold value to a set second threshold value.

[0020] Optionally, the relationship between the time duration for the sampling resistor voltage to increase from a set first threshold value to a set second threshold value and the resistance of the thyristor-level circuit is as shown in the following formula:

[0021]

[0022] In the formula, R j is the resistance of the thyristor stage circuit, R S is the sampling resistor, V ref1 is the first threshold, V ref2 is the second threshold, V is the thyristor voltage, Δt is the time it takes for the sampling resistor voltage to increase from the set first threshold to the set second threshold, and f is the frequency of the AC voltage.

[0023] Optionally, the relationship between the time duration for the sampling resistor voltage to increase from a set first threshold value to a set second threshold value and the resistance of the thyristor-level circuit is as shown in the following formula:

[0024]

[0025] In the formula, R j is the resistance of the thyristor stage circuit, R S is the sampling resistor, V ref1 is the first threshold, V ref2 is the second threshold, V is the thyristor voltage, Δt is the time it takes for the sampling resistor voltage to increase from the set first threshold to the set second threshold, and f is the frequency of the AC voltage.

[0026] In another aspect, the present invention further provides a method for online monitoring of the resistance value of a thyristor-level circuit of a converter valve, comprising:

[0027] The trigger monitoring board connected in series with the resistor of the thyristor-level circuit monitors the time duration for the sampling resistor voltage to rise from a set first threshold value to a set second threshold value, and transmits the time duration to the diagnosis and early warning device;

[0028] Calculating the resistance of the thyristor-level circuit based on the duration through a diagnostic warning device connected to the trigger monitoring board, and determining whether to alarm based on the duration and the resistance of the thyristor-level circuit;

[0029] The first threshold is smaller than the second threshold.

[0030] Optionally, the trigger monitoring board connected in series with the resistor of the thyristor-level circuit monitors the time duration for the sampling resistor voltage to rise from a set first threshold value to a set second threshold value, and transmits the time duration to the diagnosis and early warning device, including:

[0031] The voltage across the sampling circuit is collected by a sampling resistor connected in series with the resistor of the thyristor stage circuit;

[0032] Compare the voltage at both ends of the adopting circuit by a first comparison circuit and a second comparison circuit whose input ends are connected between the sampling resistor and the resistor, and if the voltage is less than the sampling resistor voltage, output a rising edge to the timing circuit, otherwise continue to judge;

[0033] The timing circuit connected to the output terminals of the first comparison circuit and the second comparison circuit performs timing based on the rising edge interval output by the first comparison circuit and the second comparison circuit, and sends the timing as a monitoring value to the diagnosis and early warning device.

[0034] Optionally, the calculation of the resistance of the thyristor-level circuit based on the duration by the diagnostic warning device connected to the trigger monitoring board includes:

[0035] The resistance of the thyristor-level circuit is obtained based on the relationship between the time length during which the sampling resistor voltage increases from a set first threshold value to a set second threshold value and the resistance of the thyristor-level circuit.

[0036] Optionally, the relationship between the time duration for the sampling resistor voltage to increase from a set first threshold value to a set second threshold value and the resistance of the thyristor-level circuit is as shown in the following formula:

[0037]

[0038] In the formula, R j is the resistance of the thyristor stage circuit, R S is the sampling resistor, V ref1 is the first threshold, V ref2 is the second threshold, V is the thyristor voltage, Δt is the time it takes for the sampling resistor voltage to increase from the set first threshold to the set second threshold, and f is the frequency of the AC voltage.

[0039] Optionally, the relationship between the time duration for the sampling resistor voltage to increase from a set first threshold value to a set second threshold value and the resistance of the thyristor-level circuit is as shown in the following formula:

[0040]

[0041] In the formula, R j is the resistance of the thyristor stage circuit, R S is the sampling resistor, V ref1 is the first threshold, V ref2 is the second threshold, V is the thyristor voltage, Δt is the time it takes for the sampling resistor voltage to increase from the set first threshold to the set second threshold, and f is the frequency of the AC voltage.

[0042] Optionally, the determining whether to alarm based on the duration and the resistance of the thyristor-level circuit includes:

[0043] When the resistance of the thyristor-level circuit is higher than a preset high threshold, or lower than a preset low threshold, an alarm message is issued;

[0044] When the diagnostic warning device judges the duration of the same thyristor-level circuit, it judges whether the duration is greater than a set duration high threshold, or is lower than a set duration low threshold. If it is greater than the set duration high threshold, or is lower than the set duration low threshold, an alarm is given; otherwise, no alarm is given;

[0045] When the diagnostic and early warning device judges the duration of multiple thyristor-level circuits, the average value of the duration of the multiple thyristor-level circuits is calculated, and the absolute value of the difference between the average value and the duration of the thyristor-level circuit to be judged is calculated. If the absolute value of the difference is greater than the set error threshold and the duration is greater than the set time threshold, an alarm is given, otherwise no alarm is given.

[0046] In another aspect, the present application further provides a computing device, comprising: at least one processor and a memory;

[0047] The memory is used to store one or more programs;

[0048] When the one or more programs are executed by the at least one processor, the above-mentioned method for online monitoring of the resistance value of the thyristor-level circuit of the converter valve is implemented.

[0049] On the other hand, the present application also provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed, the above-mentioned method for online monitoring of the resistance value of a thyristor-level circuit of a converter valve is implemented.

[0050] Compared with the prior art, the present invention has the following beneficial effects:

[0051] The present invention provides an online monitoring device for the resistance value of a thyristor-level circuit of a converter valve, comprising: a trigger monitoring board and a diagnostic warning device that are interconnected; the trigger monitoring board is connected in series with the resistance of the thyristor-level circuit, and is used to monitor the time length for the sampling resistor voltage to rise from a set first threshold value to a set second threshold value, and transmit the time length to the diagnostic warning device; the diagnostic warning device is used to calculate the resistance of the thyristor-level circuit based on the time length, and judge whether to alarm based on the time length and the resistance of the thyristor-level circuit; wherein the first threshold value is less than the second threshold value. The present invention only needs to monitor the time length for the sampling resistor voltage to rise from a set first threshold value to a set second threshold value online through the trigger monitoring board, and then the resistance of the thyristor-level circuit can be calculated, and an alarm judgment can be made, thereby realizing online monitoring of the resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a schematic diagram of the thyristor-level circuit of the UHV converter valve;

[0053] FIG2(a) is a voltage waveform diagram of a DC voltage balancing resistor under rectification conditions;

[0054] FIG2( b ) is a voltage waveform diagram of the DC voltage balancing resistor under inverter conditions;

[0055] Figure 3 It is a schematic diagram of the monitoring and diagnosis principle of the present invention;

[0056] Figure 4 The monitoring voltage V2 of the present invention is from the threshold value V ref1 Increases to the threshold V ref2 Schematic diagram of the time t curve;

[0057] Figure 5 It is a structural schematic diagram of an online monitoring device for the resistance value of a thyristor-level circuit of a converter valve according to the present invention;

[0058] Figure 6 A flow chart of an online monitoring method for the resistance value of a thyristor-level circuit of a converter valve according to the present invention;

[0059] Figure 7 The figure is a schematic diagram of the structure of a computer device of the present invention. DETAILED DESCRIPTION

[0060] The present invention proposes a simple online resistance monitoring method, which has the advantages of less signal acquisition, no need to measure high voltage signals, no need to modify the original circuit, etc. The method proposed by the present invention is also applicable to other fields requiring resistance monitoring.

[0061] A device and method for online monitoring the resistance value of a thyristor-level circuit of a converter valve is provided, and its purpose is to be able to online monitor the resistance value of a DC voltage-equalizing resistor in a thyristor-level circuit of a converter valve. Only a comparison circuit and a timing function need to be added to a trigger monitoring board, and there is no need to modify the original thyristor circuit, and high voltage will not be introduced into the trigger monitoring board.

[0062] In order to better understand the present invention, the content of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0063] Embodiment 1:

[0064] An online monitoring device for the resistance value of a thyristor-level circuit of a converter valve, such as Figure 5 As shown, it includes: trigger monitoring boards and diagnostic warning equipment connected to each other;

[0065] The trigger monitoring board is connected in series with the resistor of the thyristor-level circuit, and is used to monitor the time length for the sampling resistor voltage to rise from a set first threshold value to a set second threshold value, and transmit the time length to the diagnosis and early warning device;

[0066] The diagnostic warning device is used to determine whether to alarm based on the duration;

[0067] The first threshold is smaller than the second threshold.

[0068] Before introducing the present invention, the monitoring and diagnosis principles are first introduced:

[0069] First, the principle of the method of the present invention is introduced. Figure 3 As shown, the monitored resistor and the sampling resistor are connected in series, and the voltage across the two ends changes in a sinusoidal manner, which is V1 = V*sin(2πf*t), then the voltage of V2 is If the voltage V1 is constant and R and Rs are unchanged, the voltage V2 increases from the threshold V ref1 Increases to the threshold V ref2 The time can be calculated by the above formula and is fixed. If the DC voltage balancing resistor fails and its resistance value decreases, the sampling resistor voltage will increase, so the voltage will increase from the threshold value V ref1 Increases to the threshold V ref2 The time will be reduced as Figure 4 On the contrary, if the DC voltage balancing resistor fails and its resistance increases, the sampling resistor voltage will decrease, so the voltage will increase from the threshold value V ref1 Increases to the threshold V ref2 The time will increase as Figure 4 As shown in t2, therefore, it is only necessary to monitor the voltage V2 from the threshold V ref1 Increases to the threshold V ref2 The time t, combined with calculation and logical judgment, can determine the resistance value of the DC balancing resistor.

[0070] The overall block diagram of the online monitoring device for the resistance value of the thyristor-level circuit of the converter valve provided by the present invention is as follows: Figure 5 As shown, it mainly includes a trigger monitoring board and a diagnostic warning device. The trigger monitoring board is responsible for collecting and sending the collected monitoring data to the diagnostic warning device through optical fiber. The diagnostic warning device can be the original valve-based electronic device or a newly added device. Its main function is to receive the monitoring data of the trigger monitoring board, perform calculations and processing, so as to determine whether the resistance value of the DC voltage-equalizing resistor meets the normal operation requirements of the converter valve, and issue a warning.

[0071] Designed in the original trigger monitoring board Figure 5 In the circuit shown, the sampling resistor Rs and the DC voltage balancing resistor are in series. ref1 The comparison circuit compares the sampling resistor voltage with V ref1 When the sampling resistor voltage is greater than V ref1 When it is high level, it outputs high level, otherwise it outputs low level; V ref2 The comparison circuit compares the sampling resistor voltage with V ref2 When the sampling resistor voltage is greater than V ref2 When the rising edge of the two comparison circuits is high, the output is high level, otherwise it is low level. The timing circuit counts the interval time of the rising edge of the two comparison circuits. The trigger monitoring board sends the timing data to the diagnosis and early warning equipment through optical fiber.

[0072] The diagnostic warning device receives the monitoring data of the trigger monitoring board, calculates and processes the DC voltage balancing resistance status and issues a warning. There are three diagnostic warning methods:

[0073] (1) Precision calculation method: According to the voltage division formula and the voltage sinusoidal change law, precise calculation is performed to obtain accurate R j Resistance value.

[0074] The sampling resistor voltage is V RS :

[0075]

[0076] The sampling resistor voltage can be obtained by V ref1 Rise to V ref2 The time Δt and R j The following relationship exists:

[0077]

[0078] In the formula, the thyristor voltage V, Rs, V ref1 、V ref2 , so R can be calculated by monitoring the value Δt j . j Set the high and low thresholds. j When the value exceeds the high threshold or falls below the low threshold, an alarm is issued.

[0079] (2) Simplified calculation method: V ref1 and V ref2 The value range of is within the dotted line in Figure 2, that is, near the zero crossing point. In this range, sin(2πf*t)≈2πf*t, using this simplified formula, we can get the sampling resistor voltage V ref1 Rise to Vref2 The time Δt and R j The following relationship exists:

[0080]

[0081] In the formula, the thyristor voltage V, Rs, V ref1 、V ref2 , so R can be calculated by monitoring the value Δt j . j Set the high and low thresholds. j When the value exceeds the high threshold or falls below the low threshold, an alarm is issued.

[0082] (3) Logical judgment method: This method does not perform calculations, but directly diagnoses R based on the monitored Δt value through logical judgment. j The value of Δt changes with R.j The Δt value of the thyristor circuit changes with the value, and the diagnosis and early warning equipment can monitor the Δt value of multiple thyristor circuits at the same time. The design judgment logic is as follows: 1) Continuously record the monitoring value Δt of the same thyristor circuit, and when the monitoring value Δt is continuously greater than the high threshold or lower than the low threshold for a period of time, an alarm is issued. 2) Compare the Δt values ​​of different thyristor circuits and take the average value. Set high and low thresholds. When the difference between the Δt value of a certain thyristor circuit and the average value is continuously greater than the high threshold or lower than the low threshold for a period of time, an alarm is issued.

[0083] The present invention proposes a monitoring and diagnosis method for the resistance value, which is particularly suitable for monitoring the resistance value of the DC equalizing resistor at the thyristor level of the converter valve. At present, there is no online monitoring method and device for the resistance value of the DC equalizing resistor at the thyristor level of the converter valve. Compared with the traditional method of collecting the voltage and current at both ends of the resistor and calculating the resistance value using the resistance ohm formula, the present invention has obvious advantages: 1) The signal acquisition circuit is simple, and only a comparison circuit and a timing function circuit are required to complete the acquisition, while the traditional method requires analog-to-digital conversion and a complex circuit; 2) There are few collected signals, and only the rising edge interval time of the two comparison circuits needs to be collected, while the traditional method needs to collect voltage and current; 3) There is no need to directly measure the high-voltage signal, which reduces the design difficulty of the trigger monitoring board; 4) There is no need to modify the original thyristor-level circuit, and only the trigger monitoring board needs to be upgraded.

[0084] The monitoring board is triggered, and the comparison circuit result is input into the processor chip, which completes the timing function and sends the monitoring data through optical fiber. The diagnostic and early warning equipment can use the processor chip.

[0085] Figure 7 The valve base electronic device is a valve base electronic device. In this example, the diagnostic and early warning functions are integrated into the original valve base electronic device. The valve base electronic device includes a trigger and monitoring chassis and a communication and control chassis. The trigger and monitoring chassis is responsible for receiving the monitoring data of all thyristor levels, summarizing them and sending them to the communication and control chassis. The communication and control chassis implements the diagnostic and early warning functions described in Chapter 5.

[0086] Embodiment 2:

[0087] The present invention based on the same inventive concept also provides a method for online monitoring the resistance value of a thyristor-level circuit of a converter valve, such as Figure 6 As shown, including:

[0088] Step S1: monitoring the time length for the sampling resistor voltage to rise from a set first threshold value to a set second threshold value through a trigger monitoring board connected in series with the resistor of the thyristor-level circuit, and transmitting the time length to the diagnosis and early warning device;

[0089] Step S2: calculating the resistance of the thyristor-level circuit based on the duration through a diagnostic warning device connected to the trigger monitoring board, and determining whether to alarm based on the duration and the resistance of the thyristor-level circuit;

[0090] The first threshold is smaller than the second threshold.

[0091] Optionally, the trigger monitoring board connected in series with the resistor of the thyristor-level circuit monitors the time duration for the sampling resistor voltage to rise from a set first threshold value to a set second threshold value, and transmits the time duration to the diagnosis and early warning device, including:

[0092] The voltage across the sampling circuit is collected by a sampling resistor connected in series with the resistor of the thyristor stage circuit;

[0093] Compare the voltage at both ends of the adopting circuit by a first comparison circuit and a second comparison circuit whose input ends are connected between the sampling resistor and the resistor, and if the voltage is less than the sampling resistor voltage, output a rising edge to the timing circuit, otherwise continue to judge;

[0094] The timing circuit connected to the output terminals of the first comparison circuit and the second comparison circuit performs timing based on the rising edge interval output by the first comparison circuit and the second comparison circuit, and sends the timing as a monitoring value to the diagnosis and early warning device.

[0095] Optionally, the calculation of the resistance of the thyristor-level circuit based on the duration by the diagnostic warning device connected to the trigger monitoring board includes:

[0096] The resistance of the thyristor-level circuit is obtained based on the relationship between the time length during which the sampling resistor voltage increases from a set first threshold value to a set second threshold value and the resistance of the thyristor-level circuit.

[0097] Optionally, the relationship between the time duration for the sampling resistor voltage to increase from a set first threshold value to a set second threshold value and the resistance of the thyristor-level circuit is as shown in the following formula:

[0098]

[0099] In the formula, R j is the resistance of the thyristor stage circuit, R S is the sampling resistor, V ref1 is the first threshold, V ref2 is the second threshold, V is the thyristor voltage, Δt is the time it takes for the sampling resistor voltage to increase from the set first threshold to the set second threshold, and f is the frequency of the AC voltage.

[0100] Optionally, the relationship between the time duration for the sampling resistor voltage to increase from a set first threshold value to a set second threshold value and the resistance of the thyristor-level circuit is as shown in the following formula:

[0101]

[0102] In the formula, R j is the resistance of the thyristor stage circuit, R S is the sampling resistor, V ref1 is the first threshold, V ref2 is the second threshold, V is the thyristor voltage, Δt is the time it takes for the sampling resistor voltage to increase from the set first threshold to the set second threshold, and f is the frequency of the AC voltage.

[0103] Optionally, the determining whether to alarm based on the duration and the resistance of the thyristor-level circuit includes:

[0104] When the resistance of the thyristor-level circuit is higher than a preset high threshold, or lower than a preset low threshold, an alarm message is issued;

[0105] When the diagnostic warning device judges the duration of the same thyristor-level circuit, it judges whether the duration is greater than a set duration high threshold, or is lower than a set duration low threshold. If it is greater than the set duration high threshold, or is lower than the set duration low threshold, an alarm is given; otherwise, no alarm is given;

[0106] When the diagnostic and early warning device judges the duration of multiple thyristor-level circuits, the average value of the duration of the multiple thyristor-level circuits is calculated, and the absolute value of the difference between the average value and the duration of the thyristor-level circuit to be judged is calculated. If the absolute value of the difference is greater than the set error threshold and the duration is greater than the set time threshold, an alarm is given, otherwise no alarm is given.

[0107] Example 3

[0108] like Figure 7 As shown, the present invention also provides an electronic device, which may be a computer device, a single-chip device, an intelligent mobile device, etc. The electronic device in this embodiment may include a processor, a memory, a transceiver component, etc. The memory, the processor, and the transceiver component are connected via a bus; the memory may be used to store an execution program, and an exemplary execution program may include instructions; the processor is used to execute the instructions stored in the memory. The memory may also be used to store data, which may be called and / or modified when the instructions are executed.

[0109] The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, and is specifically suitable for loading and executing one or more instructions in a storage medium to implement corresponding method flows or corresponding functions, so as to implement the steps of an online monitoring method for the resistance value of a thyristor-level circuit of a converter valve in the above-mentioned embodiment.

[0110] Example 4

[0111] Based on the same inventive concept, the present invention also provides a readable storage medium, specifically an electronic device readable storage medium (Memory), which is a memory device in an electronic device for storing programs and data. It can be understood that the storage medium here can include both built-in storage media in the electronic device and, of course, extended storage media supported by the electronic device. The storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by the processor are also stored in the storage space, and these instructions can be one or more execution programs (including program codes). It should be noted that the storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor loads and executes one or more instructions stored in the storage medium, which can implement the steps of the online monitoring method of the resistance value of the thyristor-level circuit of a commutator valve in the above embodiment.

[0112] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0113] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0114] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0115] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0116] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of the claims of the present invention to be approved.

Claims

1. An online monitoring device for the resistance value of a thyristor-level circuit of a converter valve, characterized in that: include: Interconnected trigger monitoring boards and diagnostic warning equipment; The trigger monitoring board is connected in series with the resistor of the thyristor-level circuit, and is used to monitor the time length for the sampling resistor voltage to rise from a set first threshold value to a set second threshold value, and transmit the time length to the diagnosis and early warning device; The diagnostic warning device is used to calculate the resistance of the thyristor-level circuit based on the time length, and determine whether to alarm based on the time length and the resistance of the thyristor-level circuit; The first threshold is smaller than the second threshold.

2. The device according to claim 1, characterized in that The trigger monitoring board includes: a sampling resistor, a first comparison circuit, a second comparison circuit and a timing circuit; The sampling resistor is connected in series with the resistor of the thyristor-level circuit; The input ends of the first comparison circuit and the second comparison circuit are connected between the sampling resistor and the resistor, and the output ends of the first comparison circuit and the second comparison circuit are both connected to the timing circuit; The first comparison circuit and the second comparison circuit are used to compare with the sampling resistor voltage respectively, and if it is less than the sampling resistor voltage, output a rising edge to the timing circuit, otherwise continue to judge; The timing circuit is connected to the diagnosis and early warning device, and is used for timing based on the rising edge interval output by the first comparison circuit and the second comparison circuit, and sending the timing as a monitoring value to the diagnosis and early warning device.

3. The device according to claim 1, characterized in that The diagnostic warning device includes valve base electronic equipment.

4. The device according to claim 1, characterized in that The diagnostic and early warning device is specifically used for: The resistance of the thyristor-level circuit is obtained based on the relationship between the time length during which the sampling resistor voltage increases from a set first threshold value to a set second threshold value and the resistance of the thyristor-level circuit; When the resistance of the thyristor-level circuit is higher than a preset high threshold, or lower than a preset low threshold, an alarm message is issued; Whether to issue an alarm message is determined based on the time length during which the sampling resistor voltage increases from a set first threshold value to a set second threshold value.

5. The device according to claim 4, characterized in that The relationship between the time duration for the sampling resistor voltage to rise from the set first threshold value to the set second threshold value and the resistance of the thyristor-level circuit is as follows: In the formula, R j is the resistance of the thyristor stage circuit, R S is the sampling resistor, V ref1 is the first threshold, V ref2 is the second threshold, V is the thyristor voltage, Δt is the time it takes for the sampling resistor voltage to increase from the set first threshold to the set second threshold, and f is the frequency of the AC voltage.

6. The device according to claim 4, characterized in that The relationship between the time duration for the sampling resistor voltage to rise from the set first threshold value to the set second threshold value and the resistance of the thyristor-level circuit is as follows: In the formula, R j is the resistance of the thyristor stage circuit, R S is the sampling resistor, V ref1 is the first threshold, V ref2 is the second threshold, V is the thyristor voltage, Δt is the time it takes for the sampling resistor voltage to increase from the set first threshold to the set second threshold, and f is the frequency of the AC voltage.

7. A method for online monitoring of the resistance value of a thyristor-level circuit of a converter valve, characterized in that: include: The trigger monitoring board connected in series with the resistor of the thyristor-level circuit monitors the time duration for the sampling resistor voltage to rise from a set first threshold value to a set second threshold value, and transmits the time duration to the diagnosis and early warning device; Calculating the resistance of the thyristor-level circuit based on the duration through a diagnostic warning device connected to the trigger monitoring board, and determining whether to alarm based on the duration and the resistance of the thyristor-level circuit; The first threshold is smaller than the second threshold.

8. The method according to claim 7, characterized in that The trigger monitoring board connected in series with the resistor of the thyristor-level circuit monitors the time length for the sampling resistor voltage to rise from a set first threshold value to a set second threshold value, and transmits the time length to the diagnosis and early warning device, including: The voltage across the sampling circuit is collected by a sampling resistor connected in series with the resistor of the thyristor stage circuit; Compare the voltage at both ends of the adopting circuit by a first comparison circuit and a second comparison circuit whose input ends are connected between the sampling resistor and the resistor, and if the voltage is less than the sampling resistor voltage, output a rising edge to the timing circuit, otherwise continue to judge; The timing circuit connected to the output terminals of the first comparison circuit and the second comparison circuit performs timing based on the rising edge interval output by the first comparison circuit and the second comparison circuit, and sends the timing as a monitoring value to the diagnosis and early warning device.

9. The method according to claim 7, characterized in that The diagnostic warning device connected to the trigger monitoring board calculates the resistance of the thyristor-level circuit based on the duration, including: The resistance of the thyristor-level circuit is obtained based on the relationship between the time length during which the sampling resistor voltage increases from a set first threshold value to a set second threshold value and the resistance of the thyristor-level circuit.

10. The method according to claim 9, characterized in that The relationship between the time duration for the sampling resistor voltage to rise from the set first threshold to the set second threshold and the resistance of the thyristor-level circuit is as follows: In the formula, R j is the resistance of the thyristor stage circuit, R S is the sampling resistor, V ref1 is the first threshold, V ref2 is the second threshold, V is the thyristor voltage, Δt is the time it takes for the sampling resistor voltage to increase from the set first threshold to the set second threshold, and f is the frequency of the AC voltage.

11. The method according to claim 9, characterized in that The relationship between the time duration for the sampling resistor voltage to rise from the set first threshold to the set second threshold and the resistance of the thyristor-level circuit is as follows: In the formula, R j is the resistance of the thyristor stage circuit, R S is the sampling resistor, V ref1 is the first threshold, V ref2 is the second threshold, V is the thyristor voltage, Δt is the time it takes for the sampling resistor voltage to increase from the set first threshold to the set second threshold, and f is the frequency of the AC voltage.

12. The method according to claim 9, characterized in that The determining whether to alarm based on the duration and the resistance of the thyristor-level circuit includes: When the resistance of the thyristor-level circuit is higher than a preset high threshold, or lower than a preset low threshold, an alarm message is issued; When the diagnostic warning device judges the duration of the same thyristor-level circuit, it judges whether the duration is greater than a set duration high threshold, or is lower than a set duration low threshold. If it is greater than the set duration high threshold, or is lower than the set duration low threshold, an alarm is given; otherwise, no alarm is given; When the diagnostic and early warning device judges the duration of multiple thyristor-level circuits, the average value of the duration of the multiple thyristor-level circuits is calculated, and the absolute value of the difference between the average value and the duration of the thyristor-level circuit to be judged is calculated. If the absolute value of the difference is greater than the set error threshold and the duration is greater than the set time threshold, an alarm is given, otherwise no alarm is given.

13. An electronic device, characterized in that: include: at least one processor and memory; The memory and the processor are connected via a bus; The memory is used to store one or more programs; When the one or more programs are executed by the at least one processor, an online resistance monitoring method for a thyristor-level circuit of a converter valve as claimed in any one of claims 7 to 12 is implemented.

14. A readable storage medium, characterized in that: An execution program is stored thereon, and when the execution program is executed, an online resistance monitoring method for a thyristor-level circuit of a converter valve as described in any one of claims 7 to 12 is implemented.

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