On-line detection system for standby far-end module of direct-current transformer

Abstract

The invention relates to an online detection system for a standby far-end module of a direct-current transformer. Relates to the technical field of direct-current transformer testing. The system comprises a standby far-end module, a control module, a photoelectric conversion module, a data conversion module, an in-operation merging unit and a laser power supply module. The standby far-end module is connected with the photoelectric conversion module and the laser power supply module, the control module is connected with the photoelectric conversion module and the data conversion module, and the data conversion module is connected with the laser power supply module; the running merging unit is connected with the photoelectric conversion module; the control module outputs voltage signals, and the laser power supply module provides electric energy. The standby far-end module inputs the first data signal into the control module; the control module extracts information and adjusts the data conversion module and the standby far-end module; the control module obtains the digital quantity and the second data signal, and compares the digital quantity and the second data signal with a preset signal to realize detection of the standby remote module. By adopting the system, the online detection efficiency of the precision of the standby remote module of the direct-current transformer can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of direct current transformer testing, and in particular to an online detection system for a standby remote module of a direct current transformer. Background Art

[0002] At present, the remote module of the DC current transformer is installed at the high voltage end of the DC transformer and is designed with equal potential to the shunt. The main and standby mode design is generally adopted at the work site, that is, when the remote module fails, the optical fiber of the spare remote module is connected to the running merging unit to complete the replacement of the remote module. However, since the spare remote module is installed when the DC current transformer is installed, its status cannot be monitored. If the spare remote module is already in a faulty state, the DC electronic transformer will not work after replacement, and the fault handling time will be extended. Therefore, the accuracy detection of the spare remote module has become an urgent problem to be solved.

[0003] However, the accuracy detection of DC current transformers is mainly carried out offline, that is, applying DC current to the DC current transformer through a current rise test to achieve the purpose of overall accuracy test of the DC current transformer. However, since the energy extraction coil cannot be installed inside the DC current transformer, an external DC current source must be applied, and the DC current source is bulky, which makes online accuracy measurement time-consuming. Therefore, there is currently a problem of low efficiency in online detection of the accuracy of the DC transformer standby remote module. Summary of the invention

[0004] Based on this, it is necessary to provide a system capable of online detection of a DC transformer spare remote module in order to solve the technical problem of low online detection efficiency of the DC transformer spare remote module accuracy.

[0005] The present application provides an online detection system for a DC transformer standby remote module, the system comprising: a standby remote module, a control module, a photoelectric conversion module, a data conversion module, an in-operation merging unit and a laser power supply module;

[0006] The standby remote module is connected to the photoelectric conversion module and the laser power module respectively, the control module is connected to the photoelectric conversion module and the data conversion module, and the data conversion module is also connected to the laser power module; the running merging unit is connected to the photoelectric conversion module;

[0007] The control module outputs a voltage signal through the data conversion module, and the laser power module provides corresponding electric energy to the standby remote module according to the voltage signal; the standby remote module inputs a first data signal into the control module through the data optical fiber and the optoelectronic conversion module; the control module extracts power self-test information from the first data signal, and adjusts the data conversion module based on the power self-test information, thereby adjusting the standby remote module; the control module realizes detection of the standby remote module by acquiring the digital signal of the running merging unit and the second data signal output by the adjusted standby remote module, and comparing the digital signal and the second data signal with a preset signal.

[0008] In one embodiment, the system further includes: a power supply optical fiber, a data optical fiber and a running remote module; the power supply optical fiber is used to collect the digital signal of the running merging unit, and the data optical fiber is used to collect the first data signal and the second data signal of the standby remote module.

[0009] In one of the embodiments, both the first data signal and the second data signal include the sampling value information of the standby remote module and the power self-test information.

[0010] In one embodiment, the laser power module includes a voltage control input terminal and a feedback output terminal; the data conversion module includes a digital-to-analog conversion module and an analog-to-digital conversion module; the input terminal of the digital-to-analog conversion module is connected to the output terminal of the control module, and the output terminal of the digital-to-analog conversion is connected to the voltage control input terminal of the laser power module, so as to input the voltage signal into the laser power module; the input terminal of the analog-to-digital conversion module is connected to the feedback output terminal of the laser power module, and the output terminal of the analog-to-digital conversion module is connected to the input terminal of the control module, so as to detect the feedback output voltage of the laser power module.

[0011] In one embodiment, the system further includes: a signal conditioning module; the input end of the signal conditioning module is connected to the input end of the digital-to-analog conversion module, and the output end of the signal conditioning module is connected to the voltage control input end of the laser power module, for receiving the voltage signal output by the digital-to-analog conversion module, and processing the voltage signal before inputting it into the laser power module.

[0012] In one embodiment, the data conversion module is connected to the control module via an SPI bus.

[0013] In one embodiment, the digital-to-analog conversion module uses an AD5764CSUZ chip, and the analog-to-digital conversion module uses an AD7982 chip.

[0014] In one embodiment, the control module is powered by a rechargeable battery.

[0015] In one embodiment, the system further comprises a fiber optic serial port module; the fiber optic serial port module adopts an AFBR-2418TZ fiber optic receiving device and an ST interface; the optoelectronic conversion module is respectively connected to the standby remote module and the running merging unit through the fiber optic serial port module.

[0016] In one embodiment, the control module is composed of FPGA and ARM dual-core processor.

[0017] The above-mentioned DC transformer standby remote module online detection system includes: a standby remote module, a control module, a photoelectric conversion module, a data conversion module, an operating merging unit and a laser power module; wherein the standby remote module is connected to the photoelectric conversion module and the laser power module respectively, the control module is connected to the photoelectric conversion module and the data conversion module, and the data conversion module is also connected to the laser power module; the operating merging unit is connected to the photoelectric conversion module. During the online detection of the DC transformer standby remote module, the control module outputs a voltage signal through the data conversion module, and the laser power module provides corresponding electric energy to the standby remote module according to the voltage signal; the standby remote module inputs the first data signal into the control module through the data optical fiber and the photoelectric conversion module; the control module extracts the power self-test information from the first data signal, and adjusts the data conversion module based on the power self-test information, and then adjusts the standby remote module; the control module realizes the detection of the standby remote module by acquiring the digital quantity signal of the operating merging unit and the second data signal output by the adjusted standby remote module, and comparing the digital quantity signal and the second data signal with the preset signal. Through the synergy between the various modules in the above system, not only the real-time online detection of the backup remote module is realized, but also the potential faults or abnormalities of the system can be discovered in time; through the real-time extraction and analysis of the power supply self-test information, the system can predict faults and take measures in advance, thereby improving the online detection efficiency of the accuracy of the DC transformer backup remote module. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of the structure of an online detection system for a DC transformer standby remote module in one embodiment;

[0020] Figure 2 It is a structural schematic diagram of an online detection system for a DC transformer standby remote module in another embodiment;

[0021] Figure 3 A schematic diagram of the structure of a laser power supply module in one embodiment;

[0022] Figure 4 It is a structural schematic diagram of an online detection system for a DC transformer standby remote module in yet another embodiment;

[0023] Figure 5 is a schematic diagram of the structure of a control module in one embodiment;

[0024] Figure 6 The figure is a flowchart of the online detection software process of the standby remote module in one embodiment. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0027] It can be understood that the terms "first", "second", etc. used in the present application can be used in this article to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from another element.

[0028] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intermediate element. In addition, the "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if there is transmission of electrical signals or data between the connected objects.

[0029] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0030] In an exemplary embodiment, Figure 1 As shown, a system for online detection of a standby remote module of a DC transformer is provided, comprising: a standby remote module, a control module, a photoelectric conversion module, a data conversion module, an in-service merging unit and a laser power module; the standby remote module is respectively connected to the photoelectric conversion module and the laser power module, the control module is connected to the photoelectric conversion module and the data conversion module, and the data conversion module is also connected to the laser power module; the in-service merging unit is connected to the photoelectric conversion module; the control module outputs a voltage signal through the data conversion module, and the laser power module provides corresponding electric energy to the standby remote module according to the voltage signal; the standby remote module inputs a first data signal into the control module through the data optical fiber and the photoelectric conversion module; the control module extracts power self-test information from the first data signal, and adjusts the data conversion module based on the power self-test information, thereby adjusting the standby remote module; the control module detects the standby remote module by acquiring the digital signal of the in-service merging unit and the second data signal output by the adjusted standby remote module, and comparing the digital signal and the second data signal with the preset signal.

[0031] Among them, the function of the standby remote module in the DC transformer standby remote online detection system is to provide standby power and data transmission. When the system fails, the standby remote module can ensure the stable operation of the system; the control module can monitor and manage the operating status of other modules, mainly by receiving information from the photoelectric conversion module and the data conversion module, analyzing the performance of the system and then sending corresponding adjustment instructions; the photoelectric conversion module can realize the conversion between optical signals and electrical signals, and the data conversion module can realize the conversion between digital signals and analog signals; the first data signal is output by the standby remote module and can contain key information of power self-test. According to the first data signal, the control module adjusts the corresponding module, and then re-acquires the second data signal of the adjusted standby remote module; the preset signal usually refers to the standard signal defined in the system design or debugging stage, which is used to compare and verify the working status or function of the system.

[0032] Specifically, the preset signal may include various parameters related to system operation, such as voltage, current, frequency and temperature. By comparing the acquired digital signal and the second data signal with the preset signal, the system abnormality and fault information is obtained according to the comparison result, thereby realizing online detection of the standby remote module.

[0033] More, Figure 2TX (Transmit), RX (Receive), MII (Media Independent Interface), Vc (Control Voltage) and Vf (Forward Voltage) represent transmission, reception, media independent interface, control voltage and forward voltage respectively.

[0034] The above-mentioned DC transformer standby remote module online detection system includes: a standby remote module, a control module, a photoelectric conversion module, a data conversion module, an operating merging unit and a laser power module; wherein the standby remote module is connected to the photoelectric conversion module and the laser power module respectively, the control module is connected to the photoelectric conversion module and the data conversion module, and the data conversion module is also connected to the laser power module; the operating merging unit is connected to the photoelectric conversion module. During the online detection of the DC transformer standby remote module, the control module outputs a voltage signal through the data conversion module, and the laser power module provides corresponding electric energy to the standby remote module according to the voltage signal; the standby remote module inputs the first data signal into the control module through the data optical fiber and the photoelectric conversion module; the control module extracts the power self-test information from the first data signal, and adjusts the data conversion module based on the power self-test information, and then adjusts the standby remote module; the control module realizes the detection of the standby remote module by acquiring the digital quantity signal of the operating merging unit and the second data signal output by the adjusted standby remote module, and comparing the digital quantity signal and the second data signal with the preset signal. Through the synergy between the various modules in the above system, not only the real-time online detection of the backup remote module is realized, but also the potential faults or abnormalities of the system can be discovered in time; through the real-time extraction and analysis of the power supply self-test information, the system can predict faults and take measures in advance, thereby improving the online detection efficiency of the accuracy of the DC transformer backup remote module.

[0035] In an exemplary embodiment, Figure 2 As shown, the system also includes: a power supply optical fiber, a data optical fiber and a running remote module; the power supply optical fiber is used to collect the digital signal of the running merging unit, and the data optical fiber is used to collect the first data signal and the second data signal of the standby remote module.

[0036] Among them, the power supply optical fiber is used to transmit electricity or energy. In the present application, the power supply optical fiber can be used to collect digital signals in the running merging unit; the data optical fiber is an optical fiber used for data transmission, which transmits data information through optical signals. In the present application, it can be used to collect and transmit the first data signal and the second data signal of the standby remote module.

[0037] Specifically, data optical fiber can realize large-capacity data transmission while ensuring the transmission rate, so that the system can exchange and process large amounts of data in an instant; and, during operation, the remote module can provide real-time data, reflecting the status of the system in real time through the connection with the power supply optical fiber and the data optical fiber.

[0038] In this embodiment, the power supply fiber and the data fiber are used as important components connected to the remote module, which are responsible for energy transmission and data communication respectively. This design not only improves the stability and reliability of the system, but also significantly improves the efficiency of data processing, laying the foundation for efficient online detection and monitoring.

[0039] In one embodiment, both the first data signal and the second data signal include sampling value information and power self-test information of the standby remote module.

[0040] Among them, the sampling value information may include parameters such as current, voltage, power and temperature of the standby remote module. The power self-test information of the standby remote module contained in the first data signal may be the data before adjustment of the standby remote module, including power supply status information such as power supply voltage, operating status and fault alarm before adjustment. Correspondingly, the power self-test information of the standby remote module contained in the second data signal may be the data after adjustment of the standby remote module, also including the power supply status information mentioned above.

[0041] In this embodiment, the combination of sampling value information and power supply self-test information can help the system achieve comprehensive monitoring and provide an important basis for subsequent fault diagnosis and maintenance. The system's real-time acquisition of the first data signal and the second data signal can improve the overall monitoring accuracy and response speed of the system.

[0042] Further, in one embodiment, if Figure 3 As shown, the laser power module includes a voltage control input terminal and a feedback output terminal; the data conversion module includes a digital-to-analog conversion module and an analog-to-digital conversion module; the input terminal of the digital-to-analog conversion module is connected to the output terminal of the control module, and the output terminal of the digital-to-analog conversion is connected to the voltage control input terminal of the laser power module, so as to input the voltage signal into the laser power module; the input terminal of the analog-to-digital conversion module is connected to the feedback output terminal of the laser power module, and the output terminal of the analog-to-digital conversion module is connected to the input terminal of the control module, so as to detect the feedback output voltage of the laser power module.

[0043] Among them, the voltage-controlled input end can be used to receive the voltage signal of the data conversion module and adjust the laser power output by the laser power module. By accurately controlling the voltage, the output laser power can be accurately adjusted; the feedback output end can be used to feedback the actual output voltage information of the laser power supply to the data conversion module, thereby realizing the monitoring of the system status and ensuring that the laser operates within a safe and effective range.

[0044] Furthermore, the laser power module also includes a light source output end, which provides power to the backup remote module through the power supply optical fiber; the digital-to-analog conversion module receives the digital signal from the control module, converts it into an analog signal and outputs it to the laser power module; the analog-to-digital conversion module is used to receive the analog signal from the laser power module, converts the analog signal into a digital signal and inputs it into the control module; in addition, the laser power module adopts a 2W laser power supply, which is compatible with various remote modules.

[0045] In this embodiment, the design and connection of the laser power module and the data conversion module complement each other to form a complete signal control and feedback detection system. Through the voltage control input and feedback output, the laser power module can accurately adjust its output according to the voltage signal from the digital-to-analog conversion module. At the same time, the analog-to-digital conversion module can monitor the feedback voltage in real time to ensure the stability and reliability of the system.

[0046] In an exemplary embodiment, Figure 4 As shown, the system also includes: a signal conditioning module; the input end of the signal conditioning module is connected to the input end of the digital-to-analog conversion module, and the output end of the signal conditioning module is connected to the voltage control input end of the laser power module, for receiving the voltage signal output by the digital-to-analog conversion module, and inputting the voltage signal into the laser power module after processing.

[0047] Among them, the signal conditioning module is used to process the input signal to ensure that the signal has a good sequence and stability. Specific conditioning methods may include amplification, filtering, and denoising.

[0048] Specifically, after the signal conditioning module receives the voltage signals output by the digital-to-analog conversion module, these voltage signals are usually analog signals and may have problems such as noise and distortion. After processing, they are input into the laser power module, making the electric energy output by the laser power module more stable; in addition, the conditioning circuit adopts an active method to increase the driving capability of the data conversion module.

[0049] In this embodiment, the signal conditioning module serves as an important bridge connecting the digital-to-analog conversion module and the laser power module. Its core function is to optimize and enhance the voltage signal input to the digital-to-analog conversion module to ensure that the processed signal can be transmitted to the laser power module in the best state.

[0050] Furthermore, in one embodiment, the data conversion module is connected to the control module via an SPI bus.

[0051] Among them, SPI (Serial Peripheral Interface) is a serial communication protocol, which can usually be used for short-distance communication between microcontrollers and peripheral devices. It has the advantages of high speed, simple protocol and multi-device support.

[0052] In this embodiment, the data conversion module is connected to the control module via the SPI bus, which can realize the simultaneous reception and transmission of data, thereby improving the efficiency of data exchange; in addition, only fewer signal lines are needed to complete the circuit design, thereby reducing the complexity of the overall circuit; it can also realize the connection of multiple devices, and has a fast response speed, further improving the speed of data transmission.

[0053] In one embodiment, the digital-to-analog conversion module uses an AD5764CSUZ chip, and the analog-to-digital conversion module uses an AD7982 chip.

[0054] Among them, the digital-to-analog conversion module, namely the DA (Digital-to-Analog) conversion module, adopts AD5764CSUZ, a 4-channel 16-bit chip with a signal output range of ±10V. According to the frequency and accuracy curve of the chip, a sampling output frequency of 20kHz (kilohertz) is selected, which can not only meet the accuracy of the output small voltage, but also reduce the superposition of high-frequency signals caused by discrete errors.

[0055] Furthermore, the analog-to-digital conversion module, i.e., the AD (Analog-to-Digital) conversion module, adopts an 18-bit successive approximation analog-to-digital converter AD7982 with a maximum sampling rate of 1000kSPS (thousand samples per second), which can realize high-precision, high-sampling-rate analog-to-digital conversion functions. Among them, the AD7982 is powered by a single 2.5V power supply, and has a built-in low-power, high-speed, 18-bit zero-missing-code sampling analog-to-digital conversion module, an internal conversion clock and a multi-function serial interface port. On the rising edge of the conversion signal, the voltage difference between the differential input pins is sampled, and the reference voltage is provided externally and can be set to the power supply voltage. At this time, the power consumption and throughput rate are linearly related, and the analog-to-digital conversion module supports SPI communication mode and daisy chain connection mode, and can provide an optional busy indication.

[0056] In this embodiment, by selecting two chips, the data can obtain the characteristics of high resolution, high speed, low noise and low power consumption during the digital-to-analog conversion and analog-to-digital conversion process, and is also suitable for various high-performance applications such as signal processing. In addition, the compatibility and easy-to-integrate design of the two chips can also improve the working efficiency of the entire system.

[0057] Furthermore, in one embodiment, the control module is powered by a rechargeable battery.

[0058] Specifically, a rechargeable battery is used. When the battery capacity reaches 11200mA, it can be used for 24 hours on a single charge, thus achieving a portable design.

[0059] In one embodiment, the system further comprises a fiber optic serial port module; the fiber optic serial port module adopts an AFBR2418TZ fiber optic receiving device and an ST interface; the photoelectric conversion module is respectively connected to the standby remote module and the running merging unit through the fiber optic serial port module.

[0060] Among them, the fiber optic serial port uses AFBR2418TZ fiber optic receiving device with ST interface, operating temperature -40 to 85 degrees, receiving data wavelength 865nm, receiving data rate of up to 50MBd (million bits per second), with good data compatibility.

[0061] Furthermore, in one embodiment, Figure 5 As shown, the control module is composed of FPGA and ARM dual-core processor.

[0062] The main control system uses Xilinx's ZYNQ7020 chip, which is a dual-processor architecture of FPGA+ARM. It uses a high-temperature crystal oscillator (OCXO, Oven-Controlled Crystal Oscillator) as the clock of the entire system, with a frequency accuracy level of up to 5ppm (five millionths).

[0063] Through the above embodiments, FPGA is responsible for external data collection and data transmission due to its good real-time characteristics, and the ARM core is responsible for data calculation, data generation, human-computer interaction, and program downloading and debugging, and they work together to improve the efficiency of the system.

[0064] Exemplarily, the accuracy detection of the standby remote module can first control the DA conversion module to output a small voltage signal according to the CPU system (control module) of the standby remote module online detector. After being processed by the signal conditioning module, the signal is connected to the voltage control input of the laser power module and then output through the light source. The output light energy can power the standby remote module. When the standby remote module is working, the sampling value information and the standby remote module power self-test information are sent back to the data receiving port of the standby remote module online detector through the data optical fiber; when the detector receives the data signal (first data signal) of the standby remote module, the light self-test information is extracted and the value of the DA output voltage is adjusted according to the state of the light source until it works stably; at this time, the feedback output voltage of the laser power module is detected by the AD module to realize the laser power output energy test; finally, the digital signal of the running merging unit and the digital signal of the standby remote module (second data signal) are respectively collected through the dual-optical fiber acquisition system to realize the accuracy detection of the standby remote module.

[0065] Further, in one embodiment, if Figure 6 As shown, the online detection software process of the standby remote module is as follows, including step S to step S:

[0066] Step S602, D / A voltage adjustment and transmission.

[0067] Specifically, since the light intensity of the laser power supply cannot change suddenly multiple times in a short period of time, the du / dt method is used to adjust the optical power. The initial adjustment value is the rated estimated value of the remote module (backup remote module), and the default value is given. A 16-bit ±10V D / A chip is used, so one digital quantity corresponds to 0.3mV, and the adjustment cycle can be set to 1ms, that is, one digital quantity is adjusted in 1ms, and it can be adjusted to near the rated estimated value in 6s.

[0068] Step S604: light intensity determination.

[0069] The digital signal transmitted from the standby remote module is read through the optical fiber serial port, and the power self-test signal of the standby remote module is extracted from the digital signal, including three states: communication abnormality cannot be read, the power low control word in the digital signal is 1, and the power high control word in the digital signal is 1. When the communication is abnormal or the power is low, the D / A output voltage is adjusted upward, and when the power is high, the D / A output voltage is adjusted upward. At this time, the du / dt method is still used for adjustment to prevent damage to the laser power supply caused by excessive adjustment, until the standby remote module communication is normal and the standby remote module power supply is in normal working state, the adjustment is stopped.

[0070] Step S606: reading the light source output energy.

[0071] After the standby remote module works normally, the CPU system reads the feedback output voltage signal of the laser power module through the AD chip. Since the load of the laser power module will change, the output voltage signal cannot truly reflect the output light energy of the laser power module. The feedback voltage is a fixed load inside the laser power supply, so the feedback voltage can truly reflect the driving current of the laser power module. Then, the accurate output energy of the laser power module can be obtained by multiplying the driving current by the fixed voltage drop of the laser power module. At this time, there is a linear relationship between the feedback voltage and the output energy of the laser power supply. The real-time output energy of the laser power supply can be obtained by directly multiplying the voltage value by a set coefficient. For example: P=u*k, where u is the measured value and k is the power coefficient. When the full power of the laser power is 2W, the corresponding output feedback voltage is 2V. At this time, k is 1. During normal operation, the feedback output voltage is 0.5V and the laser power is 0.5W.

[0072] Step S608: sampling accuracy check.

[0073] After the standby remote module works normally, the sampling accuracy is checked. The sampling accuracy check uses the output of the merging unit of the running remote module as the reference value, and performs digital sampling through the optical fiber serial port. Since the output sampling rate of the merging unit is 10kHz, and the output of the remote module is 50kHz, it is necessary to calculate the two sampling values ​​separately. During normal operation, a certain high-frequency ripple is superimposed on the DC current, so the DC component extraction technology is used. The DC component extraction takes 200ms time window data, and generalized polynomial fitting is used to calculate the DC component amplitude to eliminate the influence of harmonic signals and noise. The generalized polynomial fitting fits the data to a polynomial function represented by the following equation: Where f is the output sequence of the best polynomial fit, x is the input sequence X, a is the polynomial coefficient, and m is the polynomial order.

[0074] Choose the least squares method to minimize the residual according to the following equation to find the polynomial coefficients of the polynomial model: , where N is the length of Y, wi is the i-th element of the weight, fi is the i-th element of the best polynomial fit, and yi is the i-th element of Y. The difference between the two calculated DC components is then calculated. If the difference is less than 0.2% of the actual current value, the accuracy requirement is met.

[0075] Step S610, step five: redundancy detection of standby remote modules.

[0076] Specifically, the redundancy check of the standby remote module is to check the service life of the standby remote module. Since the standby remote module has been placed at the top of the transformer in a cold standby state, the power consumption of its devices needs to be detected. The main purpose is to detect whether the conversion efficiency of the photocell in the standby remote module has decreased. The detection method is to adjust the output voltage of the laser power supply under normal working conditions until it is adjusted to a low power state, and then increase the input voltage of the laser power supply, repeat several times, determine the critical point of the laser power light source output, and then read the light source output energy through step three, continue to reduce the input voltage of the laser power supply, and then perform a sampling accuracy check. When the sampling value is abnormal, increase the input voltage of the laser power supply, repeat several times to determine its critical point, read the laser power supply output energy value, continue to reduce the input voltage of the laser power supply until the communication is interrupted, and then read the laser power supply output energy. After measuring the three output energy points, compare them with the maximum output energy of the actual laser. It should have at least 50% redundancy before it can be actually used.

[0077] Through the above embodiments, a laser power control loop is constructed, and a D / A control and conditioning loop is used to output a small voltage signal that can carry a load to drive the laser power supply, and then the feedback voltage of the laser power supply is collected through the AD loop to achieve precise control of the output energy of the laser power supply; the status flag word in the digital signal output by the standby remote module is used, and the D / A control output small voltage signal and the AD collection loop are used to read the actual output energy of the laser to achieve dynamic closed-loop regulation of the laser power supply; the dual optical ports collect the digital signals of the running remote module and its matching merging unit and the digital signals of the standby remote module to achieve online sampling accuracy detection of the standby remote module; the critical point forced adjustment method is used to detect the three working points of the standby remote module to achieve redundancy testing of the standby remote module; a dual-core chip is used as the main control, and a rechargeable battery and a liquid crystal are used to achieve portable on-site detection; the du / dt output voltage adjustment method is used to adjust the laser power input voltage to prevent damage to the laser power module caused by rapid adjustment, so as to increase the service life of the test instrument.

[0078] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0079] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0080] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile 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), magnetoresistive 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. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0081] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, 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 specification.

[0082] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A DC transformer standby remote module online detection system, characterized in that: The system comprises: a standby remote module, a control module, a photoelectric conversion module, a data conversion module, an in-operation merging unit and a laser power supply module; The standby remote module is connected to the photoelectric conversion module and the laser power module respectively, the control module is connected to the photoelectric conversion module and the data conversion module, and the data conversion module is also connected to the laser power module; the running merging unit is connected to the photoelectric conversion module; The control module outputs a voltage signal through the data conversion module, and the laser power module provides corresponding electric energy to the standby remote module according to the voltage signal; the standby remote module inputs a first data signal into the control module through the data optical fiber and the optoelectronic conversion module; the control module extracts power self-test information from the first data signal, and adjusts the data conversion module based on the power self-test information, thereby adjusting the standby remote module; the control module realizes detection of the standby remote module by acquiring the digital signal of the running merging unit and the second data signal output by the adjusted standby remote module, and comparing the digital signal and the second data signal with a preset signal.

2. The system according to claim 1, characterized in that The system also includes: a power supply optical fiber, a data optical fiber and a remote module in operation; The power supply optical fiber is used to collect the digital signal of the running merging unit, and the data optical fiber is used to collect the first data signal and the second data signal of the standby remote module.

3. The system according to claim 2, characterized in that The first data signal and the second data signal both include the sampling value information of the standby remote module and the power self-test information.

4. The system according to claim 1, characterized in that The laser power supply module includes a voltage control input terminal and a feedback output terminal; the data conversion module includes a digital-to-analog conversion module and an analog-to-digital conversion module; The input end of the digital-to-analog conversion module is connected to the output end of the control module, and the output end of the digital-to-analog conversion is connected to the voltage control input end of the laser power module, so as to input the voltage signal into the laser power module; The input end of the analog-to-digital conversion module is connected to the feedback output end of the laser power module, and the output end of the analog-to-digital conversion module is connected to the input end of the control module, for detecting the feedback output voltage of the laser power module.

5. The system according to claim 4, characterized in that The system also includes: a signal conditioning module; The input end of the signal conditioning module is connected to the input end of the digital-to-analog conversion module, and the output end of the signal conditioning module is connected to the voltage control input end of the laser power module, so as to receive the voltage signal output by the digital-to-analog conversion module, and input the voltage signal into the laser power module after processing.

6. The system according to claim 4, characterized in that The data conversion module is connected to the control module via an SPI bus.

7. The system according to claim 4, characterized in that The digital-to-analog conversion module adopts the AD5764CSUZ chip, and the analog-to-digital conversion module adopts the AD7982 chip.

8. The system according to claim 1, characterized in that The control module is powered by a rechargeable battery.

9. The system according to claim 1, characterized in that The system also includes an optical fiber serial port module; The fiber optic serial port module adopts AFBR-2418TZ fiber optic receiving device and adopts ST interface; The photoelectric conversion module is connected to the standby remote module and the running merging unit respectively through an optical fiber serial port module.

10. The system according to claim 1, characterized in that The control module is composed of FPGA and ARM dual-core processor.

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