Optical power measuring device and method

Abstract

The invention relates to an optical power measuring device and method. The optical power measuring device comprises an optical attenuation module, a pulse conversion module and a power output module, the light attenuation module is used for attenuating a target light pulse output by the light-operated converter valve control system to obtain a plurality of light splitting pulses; the pulse conversion module is used for performing photoelectric conversion on any light splitting pulse to obtain a target voltage pulse; and the power output module is used for measuring the voltage value of the target voltage pulse and correspondingly outputting target optical power based on the measured voltage value. As the light-operated converter valve control system outputs laser pulses with large optical power and narrow pulse width, the optical power value of the light-operated converter valve control system is measured, the fault hidden danger that the low optical power value of a light transmitting tube cannot be found during maintenance is eliminated, and the fault risk during operation of a converter station is avoided.

Description

Technical Field

[0001] This application relates to the field of high voltage direct current transmission technology, and in particular to an optical power measurement device and method. Background Technology

[0002] High-voltage direct current (HVDC) transmission technology is an emerging power technology with advantages such as large transmission capacity, high voltage level, low manufacturing cost, low operating loss, and mature and reliable technology. When transmitting large-capacity, long-distance power, this transmission method has good technical and economic efficiency and is the development direction of DC transmission projects today.

[0003] Converter valves are core equipment in high-voltage direct current (HVDC) transmission. Depending on the control method, converter valves are generally divided into optically controlled converter valves and electrically controlled converter valves. The core component of an optically controlled converter valve is the optically controlled thyristor, which is directly triggered by laser pulses of a specific wavelength sent by the valve control system. Therefore, optically controlled converter stations require a large number of laser emitters to control the operation of the optically controlled thyristors.

[0004] However, the power of the laser emitter gradually decreases with usage time. When the optical power drops below a critical value, its energy may be insufficient to trigger the optically controlled thyristor, causing the optically controlled converter valve to fail and trigger a fault alarm. If the laser emitter is not replaced in time, it may lead to the shutdown of the converter station, resulting in huge economic losses. Summary of the Invention

[0005] Therefore, it is necessary to provide an optical power measurement device and method to address the technical problem of the laser emitting tube in the aforementioned optical control converter valve control system attenuating to the point where its energy is insufficient to trigger the optical control thyristor. This device and method can promptly determine the specific value of the optical power of the optical pulse output by the laser emitting tube and issue an alarm in a timely manner when the optical power drops below the critical point.

[0006] An optical power measurement device includes an optical attenuation module, a pulse conversion module, and a power output module;

[0007] The optical attenuation module is used to attenuate the target optical pulse output by the optical control converter valve control system to obtain multiple split optical pulses;

[0008] The pulse conversion module is used to perform photoelectric conversion on any split light pulse to obtain the target voltage pulse;

[0009] The power output module is used to measure the voltage value of the target voltage pulse and output the target optical power based on the measured voltage value.

[0010] In one embodiment, the optical attenuation module includes an optical splitter, which is provided with an input terminal and a plurality of wiring terminals. The input terminal is used to receive the target optical pulse, and each of the wiring terminals is used to output the split optical pulse.

[0011] In one embodiment, the incoming terminal is connected to each of the wiring terminals via optical fiber, which is made by fused taper.

[0012] In one embodiment, the pulse conversion module includes a light receiver and a photoelectric conversion unit. The light receiver is used to receive the split light pulse, and the photoelectric conversion unit is used to perform photoelectric conversion on the split light pulse to obtain a target voltage pulse.

[0013] In one embodiment, the photoelectric conversion unit includes a power supply and a resistor, the positive terminal of the power supply is connected to one end of the photoreceiver through the resistor, and the other end of the photoreceiver is grounded to the negative terminal of the power supply.

[0014] In one embodiment, the power output module includes a voltage acquisition unit and a power conversion unit, wherein the voltage acquisition unit is connected to the photoelectric conversion unit and the power conversion unit.

[0015] In one embodiment, the optical power measuring device further includes a display module connected to the power output module.

[0016] In one embodiment, an optical power measurement method is provided, implemented based on the aforementioned optical power measurement device, the method comprising:

[0017] The target optical pulse output from the optically controlled converter valve control system is attenuated to obtain multiple split optical pulses;

[0018] Receive any of the aforementioned split light pulses and perform photoelectric conversion to obtain the target voltage pulse;

[0019] The target optical power is obtained by converting the voltage value obtained from the measurement of the target voltage pulse.

[0020] In one embodiment, the target optical pulse output by the optically controlled converter valve control system is attenuated to obtain multiple split pulses, including:

[0021] The target light pulse output by the optical converter valve control system is attenuated and evenly divided into multiple split light pulses, the power of which is one-thousandth of the target light pulse.

[0022] In one embodiment, the step of converting the voltage value obtained from measuring the target voltage pulse into target optical power includes:

[0023] The target voltage pulse is measured to obtain the voltage value;

[0024] The voltage value is converted into the target optical power by using the correspondence between optical power and voltage value.

[0025] The aforementioned optical power measurement device and method include an optical attenuation module, a pulse conversion module, and a power output module. The optical attenuation module attenuates the target optical pulse output by the optically controlled converter valve control system to obtain multiple split pulses. The pulse conversion module performs photoelectric conversion on any split pulse to obtain a target voltage pulse. The power output module measures the voltage value of the target voltage pulse and outputs the target optical power based on the measured voltage value. This method addresses the characteristic of laser pulses output by the optically controlled converter valve control system, which are characterized by high optical power and narrow pulse width. It enables the measurement of their optical power values, eliminating the possibility of failing to detect low optical power values ​​in the optical emitter tube during maintenance and avoiding potential malfunctions during converter station operation. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic block diagram of the optical power measurement device in one embodiment;

[0028] Figure 2 This is a schematic block diagram of the optical power measurement device in another embodiment;

[0029] Figure 3 This is a schematic diagram of the internal wiring of the optical splitter in one embodiment;

[0030] Figure 4 This is a circuit diagram of a pulse conversion module in one embodiment;

[0031] Figure 5 This is a schematic block diagram of the optical power measurement device in another embodiment;

[0032] Figure 6 This is a flowchart illustrating an optical power measurement method in one embodiment;

[0033] Figure 7 This is a flowchart illustrating the optical power measurement method in another embodiment;

[0034] Figure 8This is a schematic block diagram of the optical power measurement device in another embodiment. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0036] As described in the background section, high-voltage direct current (HVDC) transmission technology is an emerging power technology with advantages such as large transmission capacity, high voltage level, low manufacturing cost, low operating loss, and mature and reliable technology. For large-capacity, long-distance power transmission, this transmission method offers excellent technical and economic efficiency and represents the current development direction of DC transmission projects. The converter valve is the core equipment of HVDC transmission. Depending on the control method, converter valves are generally divided into optically controlled converter valves and electrically controlled converter valves. The core component of the optically controlled converter valve is the optically controlled thyristor, which is directly triggered by a laser pulse of a specific wavelength sent by the valve control system. Therefore, optically controlled converter stations require a large number of laser emitting tubes to control the operation of the optically controlled thyristors.

[0037] However, the power of the laser emitter gradually decreases with usage time. When the optical power drops below a critical value, its energy may be insufficient to trigger the optically controlled thyristor, causing the optically controlled converter valve to fail and trigger a fault alarm. If the laser emitter is not replaced in time, it may lead to the shutdown of the converter station, resulting in huge economic losses.

[0038] Currently, the mainstream optically controlled converter valves are manufactured by Siemens. They rely on a corresponding valve control system to send a laser pulse with a power of 3W and a pulse width of 10µs for triggering. However, due to the high power and narrow pulse width of this laser pulse, the relevant equipment cannot directly measure its power during maintenance. Its performance can only be determined through a thyristor trigger test. In some cases, if the laser emitter in the valve control system passes the thyristor trigger test, but the actual power value of the laser emitter is already close to the critical value, it is highly likely that after a period of operation but before the next maintenance, the power of the laser emitter will have dropped below the critical value, causing the optically controlled converter valve to fail and the converter station to shut down.

[0039] Based on this, this application provides an optical power measurement device and method, which measures the optical power value of laser pulses with the characteristics of high optical power and narrow pulse width, thereby eliminating the potential fault of low optical power value of optical emitting tube that cannot be detected during maintenance and avoiding the risk of failure during converter station operation.

[0040] In one exemplary embodiment, such as Figure 1As shown, an optical power measurement device is provided, including an optical attenuation module 100, a pulse conversion module 200, and a power output module 300. The optical attenuation module 100 is used to attenuate the target optical pulse output by the optical control converter valve control system to obtain multiple split pulses. The pulse conversion module 200 is used to perform photoelectric conversion on any one of the split pulses to obtain a target voltage pulse. The power output module 300 is used to measure the voltage value of the target voltage pulse and output the target optical power based on the measured voltage value.

[0041] The optical attenuation module 100 is used to connect with the optical trigger channel of the optically controlled converter valve control system to receive the target optical pulse output by the optically controlled converter valve control system. The optical trigger channel is a channel that provides laser pulses of a specific wavelength to the optically controlled thyristor. The optical trigger channel is output by the laser emitting tube of the optically controlled converter valve control system, so the optical attenuation module 100 is actually connected to the laser emitting tube through the optical trigger channel.

[0042] Specifically, the optical attenuation module 100 attenuates the received target optical pulse and divides it into multiple split pulses. Correspondingly, the optical power of each split pulse is the attenuated optical power of the target optical pulse. The specific attenuated split pulse power value can be determined by setting a corresponding attenuation factor according to actual technical requirements. This attenuation factor can be designed based on the ability to attenuate the optical pulse of the optically controlled converter valve control system to a measurable range. It can be understood that attenuating the target optical pulse before measurement avoids the technical problem of high laser pulse power that cannot be directly measured.

[0043] For example, the optical attenuation module 100 may be connected to several optical triggering channels to obtain multiple target optical pulses that need to be measured, so as to ensure the maintenance efficiency of the laser emitting tube of the optical control converter valve control system.

[0044] In addition, the optical attenuation module 100 can be connected to the side of the optical trigger channel close to the laser emitter tube to avoid optical power errors caused by long-distance optical fiber transmission, i.e., the optical power changes caused by optical fiber transmission, which in turn cause problems such as inaccurate optical power measurement and unreliable maintenance.

[0045] Furthermore, since optical pulses cannot be directly measured, most related technologies require converting them into electrical signals before measurement. Therefore, a pulse conversion module 200 is connected to an optical attenuation module 100 to obtain any split pulse corresponding to the target optical pulse, and then performs photoelectric conversion on the split pulse to obtain the target voltage pulse. It can be understood that the data obtained by measuring the target voltage pulse can be represented as the optical power data after attenuation of the target optical pulse.

[0046] The specific structure of the pulse conversion module 200 can be determined based on the principle of photoelectric conversion. For example, in this embodiment, it can be implemented by using the method of electron transfer generated when light irradiates a corresponding semiconductor to convert light pulses into voltage pulses. Under other principles, the pulse conversion module 200 can also be implemented with other structures or devices, as long as it can convert light pulses into voltage pulses.

[0047] Furthermore, the power output module 300 detects the analog target voltage pulse generated by the pulse conversion module 200 and converts the analog target voltage pulse into a digital target voltage value. Then, based on the measured digital voltage value, it outputs the corresponding digital target optical power, thereby realizing the optical power measurement of the target optical pulse.

[0048] For example, the power output module 300 can be implemented using circuits or devices capable of analog-to-digital conversion. After analog-to-digital conversion, the optical power needs to be determined by the power output module 300. In this embodiment, the power output module 300 can be implemented using a separate control chip, such as a microcontroller unit (MCU) or a field-programmable gate array (FPGA) chip. The power output module 300 can also be implemented using an ADC circuit combined with a control chip.

[0049] The aforementioned optical power measurement device includes an optical attenuation module, a pulse conversion module, and a power output module. The optical attenuation module attenuates the target optical pulse output by the optically controlled converter valve control system to obtain multiple split pulses. The pulse conversion module performs photoelectric conversion on any split pulse to obtain a target voltage pulse. The power output module measures the voltage value of the target voltage pulse and outputs the target optical power based on the measured voltage value. This device is designed for laser pulses output by the optically controlled converter valve control system, which are characterized by high optical power and narrow pulse width. It enables the measurement of their optical power values, eliminating the possibility of low optical power values ​​in the optical emitting tubes going undetected during maintenance, and preventing potential malfunctions during converter station operation.

[0050] In one exemplary embodiment, such as Figure 2 As shown, the optical attenuation module 100 includes an optical splitter 110, which is provided with an input terminal A and multiple wiring terminals B. The input terminal A is used to receive the target optical pulse, and each wiring terminal B is used to output the split optical pulse.

[0051] Specifically, the optical splitter 110 has an input side and a connection side, which can attenuate the optical pulse signal input from the input side and then output it to the next stage through the connection side. The optical splitter 110 can be understood as a packaged optical attenuation module. The optical splitter 110 can be installed in the input device of the optical trigger channel of the optical control converter valve control system.

[0052] For example, such as Figure 3 As shown, the optical splitter 110 has an input terminal A on its input side, used to connect to the optical trigger channel of the optical control converter valve control system to acquire the target optical pulse. The optical splitter 110 also has several terminals B on its wiring side for outputting the attenuated split optical pulse. It is understood that the number of terminals B is not fixed and can be determined by a set attenuation factor. For example, this embodiment uses an attenuation factor of 1000, meaning the optical splitter 110 attenuates the target optical pulse by 1000 times, for explanation. Correspondingly, the number of terminals B can be set to achieve an attenuation of 1000 times for the target optical pulse.

[0053] In an exemplary embodiment, the incoming terminal A and each of the terminal blocks B are connected via optical fibers, which are manufactured using a fused biconical taper method. Specifically, the optical splitter 110 can be implemented by drawing several optical fibers of the same diameter from a single optical fiber using a fused biconical taper method. Correspondingly, continuing to refer to... Figure 3 Terminal A is the end of the unstretched optical fiber, while each terminal B is the end of the stretched optical fiber.

[0054] For example, the incoming terminal A and each terminal B can adopt common fiber optic terminal forms such as ST and FC, or special terminal forms, and are not limited to using a single type of fiber optic terminal or a mixture of multiple fiber optic terminal forms. In the embodiments of this application, the incoming terminal A and each terminal B all adopt the same type of fiber optic terminal.

[0055] In one exemplary embodiment, such as Figure 2 As shown, the pulse conversion module 200 includes a light receiver 210 and a photoelectric conversion unit 220. The light receiver 210 is used to receive the split light pulse, and the photoelectric conversion unit 220 is used to perform photoelectric conversion on the split light pulse to obtain the target voltage pulse.

[0056] Specifically, the photodetector 210 is used to sense any split pulse corresponding to the target light pulse, and to generate electron transfer based on the irradiation of the sensed split pulse, so as to assist in realizing photoelectric conversion. Further, the photoelectric conversion unit 220 is used to convert the electron transfer generated on the photodetector 210 into a current, so as to obtain the target voltage pulse.

[0057] For example, the optical receiver 210 is a device implemented based on the principle of photoelectric sensing, and can be a photodiode, a photodetector, or a fiber optic sensor. The optical receiver 210 of this application can be implemented using a photodiode, where the semiconductor undergoes electron transfer under the irradiation of a beam splitter pulse.

[0058] In one exemplary embodiment, such as Figure 4 As shown, the photoelectric conversion unit 220 includes a power supply and a resistor. The positive terminal of the power supply is connected to one end of the photoreceiver 210 through the resistor, and the other end of the photoreceiver 210 is grounded to the negative terminal of the power supply.

[0059] The power supply is a battery. One end of the optical receiver 210 is connected to the positive terminal of the battery through a resistor, and the negative terminal of the battery is grounded to the other end of the optical receiver, forming a configuration as follows: Figure 4 The current loop shown is used to realize the photoelectric conversion of the split pulse to obtain the target voltage pulse.

[0060] It is understandable that the parameters of the battery and resistor are not fixed and can be determined according to the amplitude of the target voltage pulse to be converted. That is, by selecting a battery and resistor with appropriate parameters, the photoelectric conversion of the split pulse can be realized to obtain the target voltage pulse with the required amplitude.

[0061] In addition, the battery, which serves as the power source, is also used to provide overall power to the optical power measurement device, so as to achieve the characteristics of small overall size and light weight of the device, thereby facilitating the operation of operators to carry out maintenance tasks on the optical control converter valve control system on the high-altitude valve tower.

[0062] In one exemplary embodiment, continuing with reference to Figure 2 The power output module 300 includes a voltage acquisition unit 310 and a power conversion unit 320, with the voltage acquisition unit 310 connected to the photoelectric conversion unit and the power conversion unit 320.

[0063] Specifically, the voltage acquisition unit 310 is used to acquire the voltage value in the current loop formed by the photodetector and the photoelectric conversion unit, thereby converting the analog target voltage pulse into a digital target voltage value. It can be understood that the voltage acquisition unit 310 can be implemented using a voltage sampling circuit, a data acquisition chip with ADC acquisition function, or directly through a control chip with an ADC acquisition channel.

[0064] Taking an optical pulse with a minimum measurable pulse width of 1µs as an example, the optical receiver and photoelectric conversion unit can perform photoelectric conversion on the split pulse to obtain a voltage signal of a specific amplitude. Then, the voltage acquisition unit 310 can perform voltage acquisition on the target voltage pulse at a sampling frequency of 1MHz and convert it to obtain the target voltage value of the required digital quantity.

[0065] Furthermore, the power conversion unit 320 is used to output the target optical power in digital form based on the measured voltage value, thereby realizing the measurement of the optical power of the target optical pulse. It can be understood that the power conversion unit 320 pre-stores voltage-optical power correspondence data. Therefore, when the measured voltage value is obtained, it can look up the corresponding voltage-optical power correspondence data and output the target optical power in digital form. The voltage-optical power correspondence data can be obtained through extensive prior experiments and stored in the power conversion unit 320.

[0066] For example, the power conversion unit 320 can be implemented using a control chip, such as a microcontroller unit (MCU) or a field programmable gate array (FPGA) chip, or it can be a simple control circuit with memory.

[0067] In one exemplary embodiment, such as Figure 5 As shown, the optical power measuring device also includes a display module 400, which is connected to the power output module 300.

[0068] Specifically, the display module 400 is connected to the power conversion unit 320 of the power output module 300 to display the measured target optical power, helping operators to understand the performance and lifespan of the laser emitter of the optical converter valve control system more intuitively and quickly, and to determine whether the device needs to be replaced in advance, so as to avoid huge economic losses caused by failures during the converter station process.

[0069] For example, the display module 400 of this application is used to form a visually visible image, and may be a display screen, a projection device, or a virtual reality imaging device. The display screen may be a liquid crystal display screen or an electronic ink display screen.

[0070] In conjunction with the above embodiments, in one exemplary embodiment, such as Figure 6 As shown, an optical power measurement method is provided, implemented based on the aforementioned optical power measurement device. The method includes steps 202 to 206, wherein:

[0071] Step 202: Introduce the target light pulse output from the optical converter valve control system for attenuation to obtain multiple split light pulses.

[0072] Specifically, the optical attenuation module is connected to the optical triggering channel of the optically controlled converter valve control system to receive the target optical pulse output by the system. The optical triggering channel provides a laser pulse of a specific wavelength to the optically controlled thyristor. The optical triggering channel is output by the laser emitting tube of the optically controlled converter valve control system, thus the optical attenuation module is essentially connected to the laser emitting tube through the optical triggering channel.

[0073] The optical attenuation module attenuates the received target optical pulse and divides it into multiple split pulses. Correspondingly, the optical power of each split pulse is the attenuated optical power of the target optical pulse. The specific attenuated power value of each split pulse can be determined by setting a corresponding attenuation factor according to actual technical requirements. This attenuation factor can be designed based on the ability to attenuate the optical pulse of the optically controlled converter valve control system to a measurable range. It can be understood that attenuating the target optical pulse before measurement avoids the technical problem of high laser pulse power making direct measurement impossible.

[0074] For example, the optical attenuation module can connect to several optical trigger channels to acquire multiple target optical pulses that need to be measured, thereby ensuring the efficiency of maintenance of the laser emitter tube in the optically controlled converter valve control system. Furthermore, the optical attenuation module can be connected to the side of the optical trigger channel closer to the laser emitter tube to minimize optical power errors caused by long-distance fiber transmission, i.e., optical power variations during fiber transmission that could lead to inaccurate optical power measurement and unreliable maintenance.

[0075] Step 204: Receive any split light pulse and perform photoelectric conversion to obtain the target voltage pulse.

[0076] Specifically, since optical pulses cannot be directly measured, most related technologies require converting them into electrical signals before measurement. This necessitates connecting a pulse conversion module to an optical attenuation module to obtain any split pulse corresponding to the target optical pulse. The split pulse is then photoelectrically converted to obtain the target voltage pulse. In essence, the data obtained by measuring the target voltage pulse represents the optical power data after attenuation of the target optical pulse.

[0077] The specific structure of the pulse conversion module can be determined based on the principle of photoelectric conversion. For example, in this embodiment, it can be implemented by using the electron transfer generated when light irradiates a corresponding semiconductor to convert light pulses into voltage pulses. Under other principles, the pulse conversion module can also be implemented with other structures or devices, as long as it can convert light pulses into voltage pulses.

[0078] Step 206: Based on the voltage value obtained by measuring the target voltage pulse, the target optical power is obtained.

[0079] Specifically, the target voltage pulse, an analog quantity generated by the pulse conversion module, can be detected by the power output module and converted into a digital target voltage value. Then, based on the measured digital voltage value, the corresponding digital target optical power is output, thereby realizing the measurement of the optical power of the target optical pulse.

[0080] For example, the power output module can be implemented using circuits or devices capable of analog-to-digital conversion. After analog-to-digital conversion, the optical power needs to be determined by the power output module. In this embodiment, the power output module can be implemented using a separate control chip, such as a microcontroller unit (MCU) or a field-programmable gate array (FPGA) chip. Alternatively, the power output module can be implemented using an ADC circuit combined with a control chip.

[0081] In this embodiment, the laser pulse output by the optically controlled converter valve control system is characterized by high optical power and narrow pulse width. The optical power value is measured to eliminate the potential fault of low optical power value of optical emitting tube that cannot be detected during maintenance, and avoid the risk of failure during converter station operation.

[0082] In an exemplary embodiment, step 202 includes: introducing the target optical pulse output by the optical control converter valve control system for attenuation, and evenly dividing it into multiple split optical pulses, wherein the power of the split optical pulse is one-thousandth of the target optical pulse.

[0083] Specifically, attenuation of the target optical pulse can be achieved through an optical splitter. An optical splitter has an input side and a connection side, and it attenuates the optical pulse signal input from the input side before outputting it to the next stage through the connection side. An optical splitter can be understood as a packaged optical attenuation module. Specifically, the optical splitter can be installed within the input device of the optical trigger channel of the optical control valve system.

[0084] For example, such as Figure 3As shown, the optical splitter 110 has an input terminal A on its input side, used to connect to the optical trigger channel of the optical control converter valve control system to acquire the target optical pulse. The optical splitter 110 also has several terminals B on its wiring side, used to output attenuated split optical pulses. It is understood that the number of terminals B is not fixed and can be determined by a set attenuation factor. For example, this embodiment uses an attenuation factor of 1000, meaning the optical splitter 110 attenuates the target optical pulse by 1000 times, as an example for explanation. Correspondingly, the number of terminals B can be set to achieve an attenuation of 1000 times for the target optical pulse. After the target optical pulse is attenuated and evenly divided to obtain multiple split optical pulses, the optical power of each split optical pulse is one-thousandth of the target optical pulse.

[0085] In one exemplary embodiment, such as Figure 7 As shown, step 206 includes steps 302 to 304, wherein:

[0086] Step 302: Measure the target voltage pulse to obtain the voltage value.

[0087] Specifically, a voltage acquisition unit can be used to acquire the voltage value in the current loop formed by the photodetector and the photoelectric conversion unit, thereby converting the analog target voltage pulse into a digital target voltage value. It can be understood that the voltage acquisition unit can be implemented using a voltage sampling circuit, a data acquisition chip with ADC acquisition function, or directly through a control chip with an ADC acquisition channel.

[0088] Taking an optical pulse with a minimum measurable pulse width of 1µs as an example, the optical receiver and photoelectric conversion unit can perform photoelectric conversion on the split pulse to obtain a voltage signal of a specific amplitude. Then, the voltage acquisition unit can sample the target voltage pulse at a sampling frequency of 1MHz and convert it to obtain the required digital target voltage value.

[0089] Step 304: Convert the voltage value into the target optical power by using the correspondence between optical power and voltage value.

[0090] Furthermore, the power conversion unit can output the target optical power in digital form based on the measured voltage value, thereby achieving the measurement of the optical power of the target optical pulse. It can be understood that the power conversion unit pre-stores voltage-optical power correspondence data. Therefore, when the measured voltage value is obtained, it can look up the corresponding voltage-optical power correspondence data and output the target optical power in digital form. This voltage-optical power correspondence data can be obtained through extensive prior experiments and stored in the power conversion unit.

[0091] For example, the power conversion unit can be implemented using a control chip, such as a microcontroller unit (MCU) or a field-programmable gate array (FPGA) chip, or it can be a simple control circuit with memory.

[0092] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0093] High-voltage direct current (HVDC) transmission technology is an emerging power technology with advantages such as large transmission capacity, high voltage level, low manufacturing cost, low operating loss, and mature and reliable technology. When transmitting large-capacity, long-distance power, this transmission method has good technical and economic efficiency and is the development direction of DC transmission projects today.

[0094] Siemens' optically controlled converter valve is one of the mainstream technologies in China. It relies on a valve control system to send a laser pulse with a power of 3 watts and a pulse width of 10µs to trigger the thyristors. Therefore, optically controlled converter stations need to be equipped with a large number of laser emitters to control the operation of the thyristors. However, the power of the laser emitters gradually decreases over time. When the power decreases below a critical value, its energy is insufficient to trigger the thyristors, causing a converter valve malfunction alarm. If it is not replaced in time, it may lead to the converter valve shutting down, resulting in huge economic losses.

[0095] Currently, for the Siemens optically controlled converter valve triggering system in high-voltage direct current transmission, due to the high optical power and narrow pulse width of its optical pulses, there is no commercially available optical power tester that can directly measure it. Only thyristor triggering tests can be performed, making it impossible to determine the specific optical power value. This leads to the inability to rule out the potential fault of low optical transmitter power during the annual inspection of the converter station, resulting in a significant risk of failure during converter valve operation. If the optical transmitter power is close to the critical value but insufficient to last until next year's maintenance, its power will drop below the critical point after a period of operation, triggering an alarm in the valve control system. If not addressed promptly, this will lead to system shutdown.

[0096] Based on this, in a specific embodiment, such as Figure 8As shown, an optical power measurement device is provided, including an optical distributor, an optical receiver, a power output module, a battery, and a display screen.

[0097] It is understandable that this optical power measurement device can directly connect and measure the optical pulses from the Siemens optically controlled converter valve control system. Since the optical power of the valve-controlled optical emitter is approximately 3W, and high-power lasers can burn out the optical receiver, it is necessary to attenuate the high-power laser from the optical emitter to a low-power optical pulse that can be collected. An optical splitter can be used to attenuate the optical pulses, dividing the 3W optical pulse into multiple pulses, each with a power approximately one-thousandth of the original. Then, an optical receiver is used to perform photoelectric conversion on one of these pulses.

[0098] This optical power measurement device can measure the optical power of optical pulses with a minimum pulse width of 1µs. Since optical pulses cannot be measured directly, they must be converted into electrical signals before measurement. This requires the design of a photoelectric converter that can convert optical energy into a specific voltage signal. A 1MHz voltage sampling circuit is used to detect the voltage value, which is then input into a power output module to convert the voltage value into an optical power value and output it.

[0099] This optical power measuring device is lightweight, compact, and battery-powered, making it easy for operators to carry out on high-altitude valve towers.

[0100] Specifically, an optical splitter is first used to attenuate the optical pulses of the valve control system, dividing the 3W optical pulse into multiple pulses, each with a power approximately one-thousandth of the original. One of these pulses is then input to an optical receiver for photoelectric conversion. The optical splitter is installed within the trigger optical pulse input device of the converter valve control system. The optical splitter can be constructed using a fused biconical taper method, drawing several fibers of the same diameter from a single optical fiber. The high-power optical pulse is input from the left, split, and output from the right, thus attenuating the optical power by a factor of 1000. This attenuates the optical pulses of the Siemens optically controlled converter valve control system to a measurable range.

[0101] Simultaneously, a light receiver is designed to convert light energy into a specific voltage signal for measurement. Using this method, power measurement can be performed on pulses with a minimum width of 1µs. After receiving a light pulse, electrons transfer within the semiconductor of the light receiver, forming a current. By selecting an appropriate power supply and resistor, this current can be converted into a specific voltage value.

[0102] Finally, after extensive testing to determine the relationship between different optical powers and voltage values, and combining the measured voltage peak values, the corresponding optical power is calibrated. The optical power corresponding to the voltage value can be determined and displayed on the screen, thus realizing the conversion of voltage signals into optical power values.

[0103] In this embodiment, a method for measuring the power of the optical emitter tubes in the valve control system is proposed for the maintenance strategy of Siemens optical control converter valves in high-voltage direct current transmission. This method can be directly used to measure the trigger optical power of the laser emitter tubes in the valve control system. The optical power of a 3-watt optical pulse with a pulse width of 10µs is directly displayed. During the maintenance of the converter valve, this method helps maintenance personnel to test a large number of optical emitters, understand the performance and lifespan of the devices, determine whether the equipment needs to be replaced in advance, effectively eliminate potential faults in subsequent operation, and reduce economic losses caused by power outages due to such faults.

[0104] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, artificial intelligence (AI) processors, etc., and are not limited to these.

[0105] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0106] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. An optical power measurement device, characterized in that: It includes a light attenuation module, a pulse conversion module and a power output module; The optical attenuation module is used to attenuate the target optical pulse output by the optically controlled converter valve control system to obtain a plurality of split optical pulses; The pulse conversion module is used to perform photoelectric conversion on any split light pulse to obtain a target voltage pulse; The power output module is used to measure the voltage value of the target voltage pulse, and output the target optical power accordingly based on the measured voltage value.

2. The optical power measurement device according to claim 1, characterized in that: The optical attenuation module comprises an optical distributor, wherein the optical distributor is provided with an incoming terminal and a plurality of connecting terminals, wherein the incoming terminal is used to receive the target optical pulse, and each of the connecting terminals is used to output a split light pulse.

3. The optical power measuring device according to claim 2, characterized in that: The incoming terminal is connected to each of the wiring terminals via an optical fiber, and the optical fiber is made by a fusion-conical method.

4. The optical power measurement device according to claim 1, characterized in that: The pulse conversion module includes a light receiver and a photoelectric conversion unit. The light receiver is used to receive the split light pulse, and the photoelectric conversion unit is used to perform photoelectric conversion on the split light pulse to obtain a target voltage pulse.

5. The optical power measuring device according to claim 4, characterized in that: The photoelectric conversion unit includes a power supply and a resistor, the positive electrode of the power supply is connected to one end of the optical receiver through the resistor, and the other end of the optical receiver and the negative electrode of the power supply are grounded.

6. The optical power measuring device according to claim 4, characterized in that: The power output module includes a voltage collection unit and a power conversion unit, and the voltage collection unit is connected to the photoelectric conversion unit and the power conversion unit.

7. The optical power measurement device according to any one of claims 1 to 6, characterized in that: It also includes a display module, which is connected to the power output module.

8. An optical power measurement method, implemented based on the optical power measurement device according to any one of claims 1 to 7, characterized in that: The method comprises: The target light pulse output by the light-controlled converter valve control system is introduced to attenuate the target light pulse, thereby obtaining multiple split light pulses; Receiving any of the split light pulses to perform photoelectric conversion to obtain a target voltage pulse; The target optical power is converted based on the voltage value obtained by measuring the target voltage pulse.

9. The optical power measurement method according to claim 8, characterized in that: The target light pulse output by the light-controlled converter valve control system is introduced to attenuate to obtain a plurality of split light pulses, including: The target light pulse output by the light-controlled converter valve control system is introduced to attenuate and evenly divided to obtain a plurality of split light pulses, wherein the power of the split light pulses is one thousandth of the target light pulse.

10. The optical power measurement method according to claim 8, characterized in that: The step of converting a voltage value obtained by measuring the target voltage pulse to obtain a target optical power comprises: Measuring the target voltage pulse to obtain a voltage value; The voltage value is converted into the target optical power according to the corresponding relationship between the optical power and the voltage value.

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