Apparatus and method for online monitoring of resistance value of resistor of thyristor-level circuit of converter valve, electronic device, storage medium, and computer program product

Abstract

An apparatus and method for online monitoring of the resistance value of a resistor of a thyristor-level circuit of a converter valve, an electronic device, a storage medium, and a computer program product. The apparatus comprises a trigger and monitoring board and a diagnosis and early-warning device which are connected to each other; the trigger and monitoring board is connected in series to a resistor of a thyristor-level circuit, and is used for monitoring the duration for which the voltage of a sampling resistor rises from a set first threshold to a set second threshold, and transmitting the duration to the diagnosis and early-warning device; and the diagnosis and early-warning device is used for calculating the resistance of the thyristor-level circuit on the basis of the duration, and determining, on the basis of the duration and the resistance of the thyristor-level circuit, whether to give an alarm, wherein the first threshold is less than the second threshold. According to embodiments of the present disclosure, the duration for which the voltage of the sampling resistor rises from the set first threshold to the set second threshold is monitored by means of the provided trigger and monitoring board, and then whether to give an alarm is determined on the basis of the duration by means of the diagnosis and early-warning device. A direct-current voltage equalization resistor can be simply and effectively monitored, and the present disclosure has the advantages of a small number of acquisition signals, no need to measure a high-voltage signal, no need to modify an original circuit, etc.

Description

A device, method, electronic equipment, storage medium, and computer program product for online monitoring of resistance values ​​in a converter valve thyristor stage circuit.

[0001] Cross-reference to related applications

[0002] This disclosure is based on and claims priority to Chinese Patent Application No. 202410979539.X, filed on July 22, 2024, entitled “An Online Monitoring Device and Method for Resistance Value of a Converter Valve Thyristor Circuit”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the fields of power generation and transmission technology, specifically to an online monitoring device, method, electronic device, storage medium, and computer program product for the resistance value of a converter valve thyristor stage circuit. Background Technology

[0004] The UHVDC converter valve, as the core equipment of UHVDC power transmission, is the core functional unit for realizing AC and DC power conversion. The converter valve consists of hundreds or even thousands of thyristor-level circuits. The thyristor-level circuits of different converter valve manufacturers are not identical, but they all consist of thyristors, resistors, capacitors, and trigger monitoring boards. Figure 1 shows one type of thyristor-level circuit. As shown in Figure 1, the trigger monitoring board 11 in the thyristor-level circuit is connected to the valve-based electronic device 13 via optical fiber 12. The main functions of the trigger monitoring board 11 include: 1) receiving trigger commands from the valve-based electronic device 13 and triggering the thyristors; 2) monitoring the thyristor-level status and sending a report signal to the valve-based electronic device 13. Some manufacturers refer to resistor 14 in Figure 1 as a DC voltage equalizing resistor; this article uses the term DC voltage equalizing resistor to describe resistor 14.

[0005] Currently, there is a lack of online monitoring methods for the resistance value of DC voltage equalization resistors. Conventional resistance monitoring methods require monitoring the voltage across the resistor and the current flowing through it; the resistance value is obtained by dividing the voltage by the current. However, this method is not suitable for ultra-high voltage converter valves because, under normal operating conditions, the voltage across the thyristor can reach over 3kV. Acquiring high-voltage signals would increase system complexity, and introducing high voltage into the monitoring board would also increase the risk of failure. Summary of the Invention

[0006] In view of the lack of online monitoring methods for the resistance value of DC equalizing resistors in related technologies, this disclosure provides at least one device, method, electronic device, storage medium, and computer program product for online monitoring of the resistance value of the thyristor stage circuit of a converter valve.

[0007] This disclosure provides an embodiment of an online resistance monitoring device for a converter valve thyristor stage circuit, comprising:

[0008] Interconnected trigger monitoring boards and diagnostic early warning devices;

[0009] The trigger monitoring board is connected in series with the resistor of the thyristor stage circuit to monitor the time it takes for the sampling resistor voltage to rise from a set first threshold to a set second threshold, and transmits the time to the diagnostic early warning device.

[0010] The diagnostic and early warning device is used to calculate the resistance value of the thyristor-level circuit based on the duration, and to determine whether to trigger an alarm based on the duration and the resistance value of the thyristor-level circuit.

[0011] Wherein, the first threshold is less than the second threshold.

[0012] Optionally, the trigger monitoring board includes: a sampling resistor, a first comparison circuit, a second comparison circuit, and a timing circuit;

[0013] The sampling resistor is connected in series with the resistor of the thyristor stage circuit;

[0014] The input terminals of the first comparator circuit and the second comparator circuit are connected between the sampling resistor and the resistor of the thyristor stage circuit, and the output terminals of the first comparator circuit and the second comparator circuit are both connected to the timing circuit.

[0015] The first comparison circuit is used to compare the first threshold with the sampling resistor voltage. If the first threshold is less than the sampling resistor voltage, a rising edge is output to the timing circuit; otherwise, the judgment continues.

[0016] The second comparison circuit is used to compare the second threshold with the sampling resistor voltage. If the second threshold is less than the sampling resistor voltage, a rising edge is output to the timing circuit; otherwise, the judgment continues.

[0017] The timing circuit is connected to the diagnostic warning device and is used to perform timing based on the rising edge interval of the outputs of the first comparison circuit and the second comparison circuit, and send the timing as a monitoring value to the diagnostic warning device.

[0018] Optionally, the diagnostic warning device includes valve-based electronic equipment.

[0019] Optionally, the diagnostic early warning device is also used for:

[0020] The resistance value of the thyristor stage circuit is obtained based on the relationship between the time it takes for the voltage of the sampling resistor to rise from a set first threshold to a set second threshold and the resistance value of the thyristor stage circuit.

[0021] An alarm message is issued when the resistance value of the thyristor stage circuit is higher than the preset high threshold or lower than the set low threshold.

[0022] Whether to issue an alarm message is determined based on the time it takes for the voltage of the sampling resistor to rise from a set first threshold to a set second threshold.

[0023] Optionally, the relationship between the time it takes for the sampling resistor voltage to rise from a set first threshold to a set second threshold and the resistance value of the thyristor stage circuit is shown in the following formula:

[0024] In the formula, R j R is the resistance value of the thyristor stage circuit. S V is the resistance value of the sampling resistor. ref1 V is the first threshold. ref2 The second threshold is V, the thyristor voltage is V, Δt is the time it takes for the sampling resistor voltage to rise from the set first threshold to the set second threshold, and f is the frequency of the AC voltage.

[0025] Optionally, the relationship between the time it takes for the sampling resistor voltage to rise from a set first threshold to a set second threshold and the resistance value of the thyristor stage circuit is shown in the following formula:

[0026] In the formula, R j R is the resistance value of the thyristor stage circuit. S V is the resistance value of the sampling resistor. ref1 V is the first threshold. ref2 The second threshold is V, the thyristor voltage is V, Δt is the time it takes for the sampling resistor voltage to rise from the set first threshold to the set second threshold, and f is the frequency of the AC voltage.

[0027] This disclosure provides an embodiment of a method for online monitoring of the resistance value of a converter valve thyristor stage circuit, including:

[0028] The trigger monitoring board, connected in series with the resistor of the thyristor stage circuit, monitors the duration for the sampling resistor voltage to rise from a set first threshold to a set second threshold, and transmits the duration to the diagnostic and early warning device.

[0029] The diagnostic and early warning device connected to the trigger monitoring board calculates the resistance value of the thyristor-level circuit based on the duration, and determines whether to alarm based on the duration and the resistance value of the thyristor-level circuit.

[0030] Wherein, the first threshold is less than the second threshold.

[0031] Optionally, the step of monitoring the duration for which the sampling resistor voltage rises from a set first threshold to a set second threshold via a trigger monitoring board connected in series with a resistor in the thyristor stage circuit, and transmitting the duration to the diagnostic early warning device, includes:

[0032] The voltage across the sampling circuit is acquired by a sampling resistor connected in series with the resistor in the thyristor stage circuit.

[0033] The first threshold is compared with the voltage of the sampling resistor by a first comparison circuit connected to the sampling resistor and the resistor through the input terminal. If the first threshold is less than the voltage of the sampling resistor, a rising edge is output to the timing circuit; otherwise, the judgment continues.

[0034] The second comparison circuit, whose input terminal is connected between the sampling resistor and the resistor, compares the second threshold with the voltage of the sampling resistor. If the second threshold is less than the voltage of the sampling resistor, a rising edge is output to the timing circuit; otherwise, the judgment continues.

[0035] A timing circuit connected to the outputs of the first and second comparator circuits performs timing based on the rising edge interval of the outputs of the first and second comparator circuits, and sends the timing as a monitoring value to a diagnostic and early warning device.

[0036] Optionally, the diagnostic early warning device connected to the trigger monitoring board calculates the resistance value of the thyristor-level circuit based on the duration, including:

[0037] The resistance value of the thyristor stage circuit is obtained based on the relationship between the time it takes for the sampling resistor voltage to rise from a set first threshold to a set second threshold and the resistance value of the thyristor stage circuit.

[0038] Optionally, the relationship between the time it takes for the sampling resistor voltage to rise from a set first threshold to a set second threshold and the resistance value of the thyristor stage circuit is shown in the following formula:

[0039] In the formula, R j R is the resistance value of the thyristor stage circuit. s V is the resistance value of the sampling resistor. ref1 V is the first threshold. ref2 The second threshold is V, the thyristor voltage is V, Δt is the time it takes for the sampling resistor voltage to rise from the set first threshold to the set second threshold, and f is the frequency of the AC voltage.

[0040] Optionally, the relationship between the time it takes for the sampling resistor voltage to rise from a set first threshold to a set second threshold and the resistance value of the thyristor stage circuit is shown in the following formula:

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

[0042] Optionally, the step of determining whether to trigger an alarm based on the duration and the resistance value of the thyristor stage circuit includes:

[0043] An alarm message is issued when the resistance value of the thyristor stage circuit is higher than the preset high threshold or lower than the set low threshold.

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

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

[0046] This disclosure provides a computing device, including: 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, an online resistance monitoring method for a converter valve thyristor stage circuit, as described above, is implemented.

[0049] This disclosure provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed, it implements an online resistance monitoring method for a converter valve thyristor stage circuit as described above.

[0050] This disclosure provides a computer program product, including a computer program or instructions, which, when executed by a processor, implements an online resistance monitoring method for a converter valve thyristor stage circuit as described above.

[0051] Compared with the prior art, the beneficial effects of the embodiments of this disclosure are as follows:

[0052] This disclosure provides an online resistance monitoring device for a converter valve thyristor-level circuit, comprising: a trigger monitoring board and a diagnostic early warning device interconnected; the trigger monitoring board is connected in series with the resistor of the thyristor-level circuit, used to monitor the duration for which the voltage of the sampled resistor rises from a set first threshold to a set second threshold, and transmits the duration to the diagnostic early warning device; the diagnostic early warning device is used to calculate the resistance of the thyristor-level circuit based on the duration, and determine whether to trigger an alarm based on the duration and the resistance of the thyristor-level circuit; wherein the first threshold is less than the second threshold. This disclosure only requires online monitoring of the duration for which the voltage of the sampled resistor rises from a set first threshold to a set second threshold via the trigger monitoring board, thus calculating the resistance value of the thyristor-level circuit and enabling alarm judgment, achieving online monitoring of the resistance value. Attached Figure Description

[0053] To more clearly illustrate the specific embodiments of this disclosure or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0054] Figure 1 is a schematic diagram of a thyristor stage circuit for an ultra-high voltage converter valve in related technologies;

[0055] Figure 2(a) is a schematic diagram of the voltage waveform of the DC equalizing resistor under the rectification condition of the converter valve;

[0056] Figure 2(b) is a schematic diagram of the voltage waveform of the DC equalizing resistor under inverter operation of the converter valve;

[0057] Figure 3 is a schematic diagram of the monitoring and diagnostic principle of an online resistance monitoring device for a converter valve thyristor stage circuit provided in an embodiment of this disclosure;

[0058] Figure 4 shows the monitoring voltage V2 from the threshold V provided in the embodiments of this disclosure. ref1 Rise to threshold V ref2 A schematic diagram of the time t curve;

[0059] Figure 5 is a schematic diagram of the structure of an online resistance monitoring device for a converter valve thyristor stage circuit according to an embodiment of this disclosure;

[0060] Figure 6 is a schematic diagram of the implementation process of an online resistance monitoring method for a converter valve thyristor stage circuit according to an embodiment of this disclosure;

[0061] Figure 7 is a schematic diagram of the composition structure of a valve-based electronic device provided in an embodiment of this disclosure;

[0062] Figure 8 is a schematic diagram of the composition structure of an electronic device according to an embodiment of the present disclosure. Detailed Implementation

[0063] This disclosure presents a simple method for online resistance monitoring, which has advantages such as requiring less signal acquisition, eliminating the need to measure high-voltage signals, and requiring no modification to the original circuit. The method proposed in this disclosure is also applicable to other fields requiring resistance monitoring.

[0064] An online monitoring device and method for the resistance value of a converter valve thyristor stage circuit is disclosed. This device can monitor the DC voltage equalization resistor value in the converter valve thyristor stage circuit online. It only requires adding a comparison circuit and timing function to the trigger monitoring board. There is no need to modify the original thyristor circuit, and high voltage will not be introduced into the trigger monitoring board.

[0065] To better understand the embodiments of this disclosure, the content of the embodiments of this disclosure will be further described below with reference to the accompanying drawings and examples.

[0066] This disclosure provides an online resistance monitoring device for the thyristor stage circuit of a converter valve, as shown in Figure 5. The device includes: a trigger monitoring board 21 and a diagnostic early warning device 22 that are interconnected.

[0067] The trigger monitoring board 21 is connected in series with the resistor (i.e., DC equalizing resistor Rj) of the thyristor stage circuit to monitor the time it takes for the sampling resistor voltage to rise from a set first threshold to a set second threshold, and transmits the time to the diagnostic early warning device 22.

[0068] The diagnostic and early warning device 22 is used to determine whether to trigger an alarm based on the duration.

[0069] Wherein, the first threshold is less than the second threshold.

[0070] Before introducing the embodiments of this disclosure, the monitoring and diagnostic principles upon which the online resistance monitoring device for the thyristor stage circuit of the converter valve provided in this disclosure is based will be introduced:

[0071] First, the principle of the method of the present invention will be introduced. The converter valve can operate in two conditions: rectification and inversion. Under the two conditions, the voltage waveform of the DC equalizing resistor is shown in Figure 2(a) and Figure 2(b), respectively. During a short period of time near the zero crossing point, the voltage changes in a sinusoidal manner, as shown in the two time intervals T0 and T1 in the figure.

[0072] Furthermore, as shown in Figure 3, the monitored resistor R (denoted as R) and the sampling resistor R S(The resistance value is denoted as R) S If the series connection has a sinusoidal voltage variation, given by V1 = V*sin(2πf*t), then the voltage V2 is... If the voltage V1 is constant, and the resistances R and R S If it remains unchanged, then the voltage V2 will decrease from the threshold voltage V. ref1 Rise to threshold V ref2 The time can be calculated using the above formula and is fixed. If the DC equalizing resistor (corresponding to the monitored resistor) malfunctions and its resistance decreases, the voltage drop across the sampling resistor increases, thus the voltage drops from the threshold V. ref1 Rise to threshold V ref2 The time will decrease as shown in t1 in Figure 4; conversely, if the DC voltage equalizing resistor malfunctions and its resistance increases, the voltage division of the sampling resistor will decrease, and thus the voltage will drop from the threshold V. ref1 Rise to threshold V ref2 The time will increase as shown by t2 in Figure 4. Therefore, it is only necessary to monitor the voltage V2 from the threshold V. ref1 Rise to threshold V ref2 By taking time t and adding calculations and logical judgments, the resistance value of the DC voltage equalizing resistor can be determined.

[0073] Figure 5 shows an overall block diagram of an online resistance monitoring device for a converter valve thyristor stage circuit according to an embodiment of this disclosure. The device includes a trigger monitoring board 21 and a diagnostic early warning device 22. The trigger monitoring board 21 is responsible for collecting and transmitting the collected monitoring data to the diagnostic early warning device 22 via optical fiber. The diagnostic early warning device 22 can be a valve-based electronic device or other newly added equipment. The functions of the diagnostic early warning device 22 include receiving the monitoring data from the trigger monitoring board 21, performing calculations, and thereby determining the DC equalization resistance R. j The resistance value (denoted as R) j Check whether the requirements for normal operation of the converter valve are met, and issue an early warning.

[0074] As shown in Figure 5, the trigger monitoring board 21 includes a sampling resistor R. S Sampling resistor R S and DC voltage equalizing resistor R j This is a series connection. V ref1 Comparator circuit 211 compares the voltage across the sampling resistor with V. ref1 Comparison, when the voltage across the sampling resistor is greater than V ref1 When the output is high, it outputs a high level; otherwise, it outputs a low level. ref2 Comparator circuit 212 will sample the resistor voltage and V ref2 Comparison, when the voltage across the sampling resistor is greater than V ref2The output is high when the condition is met and low when the condition is not met. The timing circuit 213 times the rising edge interval between the two comparison circuits. The trigger monitoring board 21 sends the timing data to the diagnostic and early warning device 22 via optical fiber.

[0075] It is understandable that the sampling resistor voltage is the voltage across the sampling resistor.

[0076] The diagnostic and early warning equipment receives monitoring data from the trigger monitoring board, performs calculations to obtain the DC equalizing resistor status, and issues an early warning. There are three diagnostic and early warning methods:

[0077] (1) Precise calculation method: Based on the voltage divider formula and the sinusoidal variation law of voltage, precise calculation is performed to obtain the accurate R. j Resistance value.

[0078] The voltage across the sampling resistor is V RS :

[0079] The voltage across the sampling resistor can be obtained from V ref1 Upgrade to V ref2 Time Δt and R j The following relationship exists between them:

[0080] In the formula, the thyristor voltage V and the resistance R of the sampling resistor are known. s First threshold V ref1 Second threshold V ref2 Therefore, the resistance value R of the DC voltage equalization resistor can be calculated from the monitored value Δt. j (That is, the resistance value of the resistor in the thyristor stage circuit). R j Set high and low thresholds, when R j An alarm will be triggered when the threshold is exceeded or the threshold is fallen below.

[0081] (2) Simplified calculation method: V ref1 and V ref2 The value range is within the voltage range corresponding to time interval T0 and T1 in Figures 2(a) and 2(b), that is, within the voltage range near the zero crossing point. Within this interval, sin(2πf*t)≈2πf*t. Using this simplified formula, the voltage across the sampling resistor can be obtained from V. ref1 Upgrade to V ref2 Time Δt and R j The following relationship exists between them:

[0082] In the formula, the thyristor voltage V and the resistance R of the sampling resistor are known. s First threshold V ref1 Second threshold V ref2Therefore, R can be calculated from the monitored value Δt. j For R j Set high and low thresholds, when R j An alarm will be triggered when the threshold is exceeded or the threshold is fallen below.

[0083] (3) Logical judgment method: This method no longer performs calculations, but directly diagnoses R based on the monitored Δt value through logical judgment. j Does the value change? Because it is clearly stated in principle that the value of Δt changes with R. j The value changes accordingly, and the diagnostic and early warning device can simultaneously monitor the Δt values ​​corresponding to multiple thyristor-level circuits. The design judgment logic is as follows: 1) The monitored value Δt corresponding to the same thyristor-level circuit is continuously recorded. When the monitored value Δt is continuously greater than the high threshold or lower than the low threshold for a period of time, an alarm is triggered. 2) The Δt values ​​corresponding to different thyristor-level circuits are compared, and the average value is taken. High and low thresholds are set. When the difference between the Δt value of a certain thyristor-level 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 triggered.

[0084] This disclosure proposes a method for monitoring and diagnosing resistance values, particularly suitable for monitoring the DC voltage equalization resistor value at the thyristor level of a converter valve. Currently, there is no online monitoring method or device for the DC voltage equalization resistor value at the thyristor level of a converter valve. Compared to the traditional method of calculating the resistance value using Ohm's law by collecting the voltage and current across the resistor, this disclosure offers significant advantages: 1) The signal acquisition circuit is simple, requiring only a comparison circuit and a timing circuit to complete the acquisition, while the traditional method requires analog-to-digital conversion, resulting in complex circuitry; 2) Fewer signals need to be acquired, requiring only the rise time interval of the two comparison circuits, while the traditional method requires collecting both voltage and current; 3) It eliminates the need for direct measurement of high-voltage signals, reducing the design difficulty of the trigger monitoring board; 4) It eliminates the need to modify the original thyristor-level circuit, requiring only an upgrade of the trigger monitoring board.

[0085] The monitoring board is triggered, and the comparison circuit result is input into the processor chip. The processor chip performs the timing function and transmits the monitoring data through optical fiber. Diagnostic and early warning devices can utilize processor chips.

[0086] Figure 7 is a schematic diagram of the composition structure of a valve-based electronic device provided in an embodiment of this disclosure. In this embodiment, diagnostic and early warning functions are integrated into the valve-based electronic device, that is, the valve-based electronic device includes the aforementioned diagnostic and early warning devices. As shown in Figure 7, the valve-based electronic device 30 includes a triggering and monitoring chassis 31 and a communication and control chassis 32. The triggering and monitoring chassis 31 is responsible for receiving monitoring data from all thyristor stages, summarizing it, and sending it to the communication and control chassis 32. The communication and control chassis 32 implements the diagnostic and early warning functions.

[0087] Based on the same inventive concept, this disclosure also provides an online method for monitoring the resistance value of the thyristor stage circuit of a converter valve, as shown in Figure 6. The method includes the following steps S1 to S2:

[0088] Step S1: The duration for the sampling resistor voltage to rise from a set first threshold to a set second threshold is monitored by a trigger monitoring board connected in series with the resistor of the thyristor stage circuit, and the duration is transmitted to the diagnostic warning device.

[0089] Step S2: The diagnostic and early warning device connected to the trigger monitoring board calculates the resistance value of the thyristor-level circuit based on the duration, and determines whether to alarm based on the duration and the resistance value of the thyristor-level circuit.

[0090] Wherein, the first threshold is less than the second threshold.

[0091] Optionally, the step of monitoring the duration for which the sampling resistor voltage rises from a set first threshold to a set second threshold via a trigger monitoring board connected in series with a resistor in the thyristor stage circuit, and transmitting the duration to the diagnostic early warning device, includes:

[0092] The voltage across the sampling circuit is acquired by a sampling resistor connected in series with the resistor in the thyristor stage circuit.

[0093] The first comparison circuit, whose input terminal is connected between the sampling resistor and the resistor, compares the first threshold with the voltage of the sampling resistor. If the threshold is less than the voltage of the sampling resistor, a rising edge is output to the timing circuit; otherwise, the judgment continues.

[0094] The second comparison circuit, whose input terminal is connected between the sampling resistor and the resistor, compares the second threshold with the voltage of the sampling resistor. If the second threshold is less than the voltage of the sampling resistor, a rising edge is output to the timing circuit; otherwise, the judgment continues.

[0095] A timing circuit connected to the outputs of the first and second comparator circuits performs timing based on the rising edge interval of the outputs of the first and second comparator circuits, and sends the timing as a monitoring value to a diagnostic and early warning device.

[0096] Optionally, the diagnostic early warning device connected to the trigger monitoring board calculates the resistance value of the thyristor-level circuit based on the duration, including:

[0097] The resistance value of the thyristor stage circuit is obtained based on the relationship between the time it takes for the sampling resistor voltage to rise from a set first threshold to a set second threshold and the resistance value of the thyristor stage circuit.

[0098] Optionally, the relationship between the time it takes for the sampling resistor voltage to rise from a set first threshold to a set second threshold and the resistance value of the thyristor stage circuit is shown in the following formula:

[0099] In the formula, R j R is the resistance value of the thyristor stage circuit. S V is the resistance value of the sampling resistor. ref1 V is the first threshold. ref2 The second threshold is V, the thyristor voltage is V, Δt is the time it takes for the sampling resistor voltage to rise 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 it takes for the sampling resistor voltage to rise from a set first threshold to a set second threshold and the resistance value of the thyristor stage circuit is shown in the following formula:

[0101] In the formula, R j R is the resistance value of the thyristor stage circuit. S V is the resistance value of the sampling resistor. ref1 V is the first threshold. ref2 The second threshold is V, the thyristor voltage is V, Δt is the time it takes for the sampling resistor voltage to rise from the set first threshold to the set second threshold, and f is the frequency of the AC voltage.

[0102] Optionally, the step of determining whether to trigger an alarm based on the duration and the resistance value of the thyristor stage circuit includes:

[0103] An alarm message is issued when the resistance value of the thyristor stage circuit is higher than the preset high threshold or lower than the set low threshold.

[0104] When the diagnostic and early warning device judges the duration corresponding to the same thyristor-level circuit, it judges whether the duration is greater than the set high duration threshold or lower than the set low duration threshold. If it is greater than the set high duration threshold or lower than the set low duration threshold, an alarm is triggered; otherwise, no alarm is triggered.

[0105] When the diagnostic and early warning device judges the duration corresponding to multiple thyristor-level circuits, it calculates the average value of each duration corresponding to the multiple thyristor-level circuits, and calculates the absolute value of the difference between the average value and the duration of the thyristor-level circuit to be judged. If the absolute value of the difference is greater than a set error threshold and the duration is greater than a set time threshold, an alarm is triggered; otherwise, no alarm is triggered.

[0106] This disclosure also provides an electronic device, which may be a computer device, a microcontroller device, a smart mobile device, etc. As shown in FIG8, the electronic device in this disclosure embodiment may include a processor 81, a memory 82, a transceiver component 83, etc. The memory 82, the processor 81, and the transceiver component 83 are connected via a bus 84; the memory 82 can be used to store executable programs, and an exemplary executable program may include instructions; the processor 81 is used to execute the instructions stored in the memory 82. The memory 82 can also be used to store data, which can be accessed and / or modified when instructions are executed.

[0107] The processor may be a Central Processing Unit (CPU), or it may be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing and control core of the terminal, and it is suitable for implementing one or more instructions. Specifically, it is suitable for loading and executing one or more instructions in the storage medium to realize the corresponding method flow or corresponding function, so as to realize the steps of the online resistance value monitoring method of the thyristor stage circuit of the converter valve in the above embodiment.

[0108] Based on the same inventive concept, this disclosure also provides a readable storage medium, specifically an electronic device readable storage medium (Memory). This readable storage medium is a memory device within an electronic device, used to store programs and data. The readable storage medium can be transient or non-transient. It is understood that the storage medium here can include both built-in storage media within the electronic device and extended storage media supported by the electronic device. The storage medium provides storage space, which stores the terminal's operating system. Furthermore, this storage space also stores one or more instructions suitable for loading and execution by a processor. These instructions can be one or more executable programs (including program code). It should be noted that the storage medium here can be high-speed RAM or non-volatile memory, such as at least one disk storage device. Loading and executing one or more instructions stored in the storage medium by the processor can implement the steps of the online resistance value monitoring method for the thyristor stage circuit of the converter valve in the above embodiments.

[0109] This disclosure provides a computer program product, including a computer program or instructions. When the computer program or instructions are executed by a processor, they implement some or all of the steps of the online resistance monitoring method for a converter valve thyristor stage circuit described in the above embodiments.

[0110] Those skilled in the art will understand that embodiments of this disclosure can be provided as methods, systems, or computer program products. Therefore, this disclosure can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, embodiments of this disclosure can take the form of a computer program product embodied 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.

[0111] This disclosure is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this disclosure. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in one or more flowchart illustrations and / or one or more block diagrams.

[0112] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means that implement the functions specified in one or more flowcharts and / or one or more block diagrams.

[0113] These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, such that the instructions, which execute on the computer or other programmable apparatus, provide steps for implementing the functions specified in one or more flowcharts and / or one or more block diagrams.

[0114] The above are merely embodiments of this disclosure and are not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure are included within the protection scope of this disclosure. Industrial applicability

[0115] This disclosure provides an online resistance monitoring device, method, electronic device, storage medium, and computer program product for a converter valve thyristor-level circuit. The device includes: a trigger monitoring board and a diagnostic early warning device connected to each other; the trigger monitoring board is connected in series with a resistor in the thyristor-level circuit to monitor the duration for which the voltage across the sampled resistor rises from a set first threshold to a set second threshold, and transmits this duration to the diagnostic early warning device; the diagnostic early warning device calculates the resistance value of the thyristor-level circuit based on the duration and determines whether to trigger an alarm based on the duration and the resistance value of the thyristor-level circuit; wherein the first threshold is less than the second threshold. This disclosure provides a simple and effective way to monitor DC voltage equalization resistors by using a trigger monitoring board to monitor the duration for which the voltage across the sampled resistor rises from a set first threshold to a set second threshold, and then using a diagnostic early warning device to determine whether to trigger an alarm based on the duration. It offers advantages such as requiring less signal acquisition, no need to measure high-voltage signals, and no need to modify the original circuit.

Claims

1. A device for on-line monitoring of resistance value of a thyristor stage circuit of a converter valve, comprising: The trigger monitoring board card and the diagnostic warning device are connected with each other; The trigger monitoring board card is connected in series with the resistance of the thyristor level circuit, and is used for monitoring a time length during which the sampling resistance voltage is raised from a first threshold value to a second threshold value, and transmitting the time length to the diagnostic warning device; The diagnostic warning device is used for calculating the resistance value of the resistance of the thyristor level circuit based on the time length, and judging whether to alarm based on the time length and the resistance value of the resistance of the thyristor level circuit. The first threshold value is less than the second threshold value.

2. The apparatus of claim 1, wherein, The trigger monitoring board card comprises a sampling resistance, a first comparison circuit, a second comparison circuit and a timing circuit; The sampling resistance is connected in series with the resistance of the thyristor level circuit; The input end of the first comparison circuit and the input end of the second comparison circuit are connected between the sampling resistance and the resistance of the thyristor level circuit, and the output end of the first comparison circuit and the output end of the second comparison circuit are connected with the timing circuit; The first comparison circuit is used for comparing the first threshold value with the sampling resistance voltage, and outputting a rising edge to the timing circuit if the first threshold value is less than the sampling resistance voltage, otherwise, the judgment is continued; The second comparison circuit is used for comparing the second threshold value with the sampling resistance voltage, and outputting a rising edge to the timing circuit if the second threshold value is less than the sampling resistance voltage, otherwise, the judgment is continued; The timing circuit is connected with the diagnostic warning device, and is used for timing based on the interval of the rising edges output by the first comparison circuit and the second comparison circuit, and sending the time length as a monitoring value to the diagnostic warning device.

3. The apparatus of claim 1 or 2, wherein, The diagnostic warning device comprises a valve-based electronic device.

4. The apparatus of any one of claims 1 to 3, wherein, The diagnostic warning device is further used for: obtaining the resistance value of the resistance of the thyristor level circuit based on the relationship between the time length during which the sampling resistance voltage is raised from the first threshold value to the second threshold value and the resistance value of the resistance of the thyristor level circuit; when the resistance value of the resistance of the thyristor level circuit is higher than a preset high threshold value or lower than a preset low threshold value, sending an alarm information; judging whether to send the alarm information based on the time length during which the sampling resistance voltage is raised from the first threshold value to the second threshold value.

5. The apparatus of claim 4, wherein, The relationship between the time length for the sampling resistance voltage to rise from the set first threshold value to the set second threshold value and the resistance value of the thyristor stage circuit is shown in the following formula: where R j is the resistance of the thyristor stage circuit, R s is the resistance of the sampling resistor, V ref1 is the first threshold value, V ref2 is the second threshold value, V is the thyristor voltage, Δt is the time period for the voltage of the sampling resistor to rise from the set first threshold value to the set second threshold value, and f is the frequency of the alternating voltage.

6. The apparatus of claim 4, wherein, The relationship between the time length for the sampling resistance voltage to rise from the set first threshold value to the set second threshold value and the resistance value of the thyristor stage circuit is shown in the following formula: where R j is the resistance of the thyristor stage circuit, R S is the resistance of the sampling resistor, V ref1 is the first threshold value, V ref2 is the second threshold value, V is the thyristor voltage, Δt is the time duration for the sampling resistor voltage to rise from the set first threshold value to the set second threshold value, and f is the frequency of the alternating voltage.

7. A resistance value on-line monitoring method of a thyristor level circuit of a converter valve, comprising: monitoring, by a trigger monitoring board card connected in series with the resistance of the thyristor level circuit, a time length during which a sampling resistance voltage is raised from a first threshold value to a second threshold value, and transmitting the time length to a diagnostic warning device; calculating, by the diagnostic warning device connected with the trigger monitoring board card, a resistance value of the resistance of the thyristor level circuit based on the time length, and judging whether to alarm based on the time length and the resistance value of the resistance of the thyristor level circuit; The first threshold value is less than the second threshold value.

8. The method of claim 7, wherein, The trigger monitoring board card comprises a sampling resistance, a first comparison circuit, a second comparison circuit and a timing circuit; The sampling resistance is connected in series with the resistance of the thyristor level circuit; The input end of the first comparison circuit and the input end of the second comparison circuit are connected between the sampling resistance and the resistance of the thyristor level circuit, and the output end of the first comparison circuit and the output end of the second comparison circuit are connected with the timing circuit; The first comparison circuit is used for comparing the first threshold value with the sampling resistance voltage, and outputting a rising edge to the timing circuit if the first threshold value is less than the sampling resistance voltage, otherwise, the judgment is continued; The second comparison circuit is used for comparing the second threshold value with the sampling resistance voltage, and outputting a rising edge to the timing circuit if the second threshold value is less than the sampling resistance voltage, otherwise, the judgment is continued; The timing circuit is connected with the diagnostic warning device, and is used for timing based on the interval of the rising edges output by the first comparison circuit and the second comparison circuit, and sending the time length as a monitoring value to the diagnostic warning device. The diagnostic warning device comprises a valve-based electronic device. The diagnostic warning device is further used for: obtaining the resistance value of the resistance of the thyristor level circuit based on the relationship between the time length during which the sampling resistance voltage is raised from the first threshold value to the second threshold value and the resistance value of the resistance of the thyristor level circuit; when the resistance value of the resistance of the thyristor level circuit is higher than a preset high threshold value or lower than a preset low threshold value, sending an alarm information; judging whether to send the alarm information based on the time length during which the sampling resistance voltage is raised from the first threshold value to the second threshold value. a first comparison circuit connected between the sampling resistor and the resistor through an input end, compares the first threshold value with the sampling resistor voltage, and outputs a rising edge to the timing circuit if the first threshold value is less than the sampling resistor voltage, otherwise continues to judge; a second comparison circuit connected between the sampling resistor and the resistor through an input end, compares the second threshold value with the sampling resistor voltage, and outputs a rising edge to the timing circuit if the second threshold value is less than the sampling resistor voltage, otherwise continues to judge; a timing circuit connected with the output ends of the first comparison circuit and the second comparison circuit, which performs timing based on the interval of the rising edges output by the first comparison circuit and the second comparison circuit, and sends the timing as a monitoring value to the diagnostic warning device.

9. The method of claim 7 or 8, wherein, The diagnostic warning device connected with the trigger monitoring board card calculates the resistance value of the thyristor stage circuit based on the time length, which includes: Based on the relationship between the time length during which the sampling resistor voltage rises from the first threshold value to the second threshold value and the resistance value of the thyristor stage circuit, the resistance value of the thyristor stage circuit is obtained.

10. The method of claim 9, wherein, The relationship between the time length for the sampling resistance voltage to rise from the set first threshold value to the set second threshold value and the resistance value of the thyristor stage circuit is shown in the following formula: where R j is the resistance of the thyristor stage circuit, R s is the resistance of the sampling resistor, V ref1 is the first threshold value, V ref2 is the second threshold value, V is the thyristor voltage, Δt is the time period for the voltage of the sampling resistor to rise from the set first threshold value to the set second threshold value, and f is the frequency of the alternating voltage.

11. The method of claim 9, wherein, The relationship between the time length for the sampling resistance voltage to rise from the set first threshold value to the set second threshold value and the resistance value of the thyristor stage circuit is shown in the following formula: where R j is the resistance of the thyristor stage circuit, R S is the resistance of the sampling resistor, V ref1 is the first threshold value, V ref2 is the second threshold value, V is the thyristor voltage, Δt is the time period for the voltage of the sampling resistor to rise from the set first threshold value to the set second threshold value, and f is the frequency of the alternating voltage.

12. The method of any one of claims 7 to 11, wherein, The judgment based on the time length and the resistance value of the thyristor stage circuit includes: When the resistance value of the thyristor stage circuit is higher than a preset high threshold value or lower than a preset low threshold value, an alarm information is sent out; When the diagnostic warning device judges the time length corresponding to the same thyristor stage circuit, it judges whether the time length is greater than a preset time length high threshold value or lower than a preset time length low threshold value, and if it is greater than the preset time length high threshold value or lower than the preset time length low threshold value, an alarm is sent out, otherwise no alarm is sent out; When the diagnostic warning device judges the time lengths corresponding to multiple thyristor stage circuits, it calculates the average value of the time lengths corresponding to the multiple thyristor stage circuits, and calculates the absolute value of the difference between the average value and the time length corresponding to the thyristor stage circuit to be judged, and if the absolute value of the difference is greater than a preset error threshold value and the duration is greater than a preset time threshold value, an alarm is sent out, otherwise no alarm is sent out.

13. An electronic device comprising: at least one processor and a memory; The memory and the processor are connected through 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, a method for online monitoring of the resistance value of the thyristor stage circuit of the converter valve is realized as claimed in any one of claims 7 to 12.

14. A readable storage medium having an execution program stored thereon, the execution program, when executed, realizes a method for online monitoring of the resistance value of the thyristor stage circuit of the converter valve as claimed in any one of claims 7 to 12.

15. A computer program product comprising a computer program or instructions, the computer program or instructions, when executed by a processor, realize a method for online monitoring of the resistance value of the thyristor stage circuit of the converter valve as claimed in any one of claims 7 to 12.

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