An on-line monitoring device and method for the energy supply of a series compensation device

Abstract

The present invention provides an on-line monitoring device and method for the energy supply of a series compensation device. The device includes a laser energy supply device, a platform measurement device, and a control and protection device; the output end of the laser energy supply device is connected to the input end of the platform measurement device, the output end of the platform measurement device is connected to the input end of the control and protection system, and the output end of the control and protection system is connected to the primary equipment of the series compensation device. The present invention realizes the transient recording of the energy taking device and the laser energy supply device when they switch through the recording module, provides effective information for the analysis of the energy supply fault of the series compensation device, and provides an effective criterion for judging the operating life of the laser energy supply device and the photovoltaic power converter; the present invention improves the effective utilization rate of the series compensation device and shortens the operation and maintenance time of the series compensation device.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and particularly relates to an on-line monitoring device and method for the energy supply of a series compensation device. Background Art

[0002] The main component of the measurement system of the series compensation device is the platform measurement box, whose function is to collect multiple analog quantities on the high-voltage capacitor platform, convert the analog quantities into digital quantities, and transmit them to the ground control center under the high-voltage platform through an optical channel. The measurement system of the series compensation device generally includes multiple platform measurement boxes, all of which are installed on the high-voltage platform insulated from the ground. There are two power supply methods for the platform measurement box. The first is the laser energy supply method: the laser is sent from the laser energy supply device on the ground to the high-voltage platform through multiple insulated optical cables, and then the energy supply is realized through multiple optoelectronic conversions; the second is the CT energy extraction method: this power supply method is completely isolated from the ground. The secondary induced current of the high-voltage line CT is used as the current source, and the DC power supply obtained after rectification is used for energy supply. These two power supply methods can be switched with each other. When the series compensation device is out of operation, the laser energy supply method is adopted, and when the series compensation device is put into operation, the CT energy extraction method is adopted. However, due to the complex electromagnetic environment on the high-voltage capacitor platform and the large temperature difference between day and night in high-altitude areas, it affects the safe and stable operation of the platform measurement box. Therefore, it is necessary to monitor the energy supply of the measurement system of the series compensation device in real time.

[0003] The monitoring system of the series compensation device in the prior art only collects the working temperature of the ground laser energy supply device and the measured analog quantities on the high-voltage platform of the series compensation device. Therefore, when the series compensation device is charged and operating, the working conditions of multiple photovoltaic power converters on the platform measurement box on the high-voltage capacitor platform and the DC voltage after rectification cannot be obtained. The effective utilization rate of the monitoring system itself is low, and due to incomplete collection of information, the operation and maintenance time of the series compensation device is long. Summary of the Invention

[0004] In order to overcome the deficiencies of low effective utilization rate and long operation and maintenance time of the series compensation device in the above-mentioned prior art, the present invention provides an on-line monitoring device for the energy supply of a series compensation device, including a laser energy supply device, a platform measurement device, and a control and protection device; the output end of the laser energy supply device is connected to the input end of the platform measurement device, the output end of the platform measurement device is connected to the input end of the control and protection system, and the output end of the control and protection system is connected to the primary equipment of the series compensation device;

[0005] The laser energy supply device is used to generate laser when the primary equipment is out of service;

[0006] The platform measurement device is used to collect the operating temperature of the photovoltaic power converter, the terminal voltage of the output sampling resistor of the primary device, and the conversion voltage when the primary device is put into operation, and obtain a frequency signal based on the collected information and the laser, and output a data frame based on the frequency signal;

[0007] The control and protection device performs wave recording on the primary device based on the data frame, and protects the primary device in case of a fault in the series compensation device or the power system.

[0008] An energy acquisition device is also provided at the input end of the platform measurement device;

[0009] The energy acquisition device is used to obtain the alternating current output by the primary device of the series compensation device when the primary device of the series compensation device is put into operation, and convert the alternating current into direct current.

[0010] The platform measurement device includes a platform power module and an analog-to-digital conversion module connected to the platform power module;

[0011] The platform power module is connected to the laser energy transmission device, and is used to obtain a frequency signal based on the laser, obtain serial data based on the frequency signal, and is also used to convert the laser into direct current when the primary device of the series compensation device is withdrawn;

[0012] The analog-to-digital conversion module is used to convert the direct current from the platform power module or the direct current and alternating current from the energy acquisition device into digital signals, and obtain a data frame based on the serial data and the digital signals.

[0013] The platform power module includes an acquisition module, a photovoltaic power converter, and an FPGA module;

[0014] The photovoltaic power converter is used to convert the laser into direct current when the primary device is withdrawn, and transmit the direct current to the analog-to-digital conversion module;

[0015] The acquisition module is connected to both the photovoltaic power converter and the photovoltaic power converter, and is used to collect the operation information of the photovoltaic power converter and convert the operation information into a frequency signal;

[0016] The FPGA module is used to convert the frequency signal into serial data.

[0017] The acquisition module includes a temperature sensor and a voltage-to-frequency converter connected to the temperature sensor;

[0018] The temperature sensor is arranged on the photovoltaic power converter, and is used to collect the operating temperature of the photovoltaic power converter and convert the operating temperature into a voltage signal;

[0019] The voltage-frequency converter is set at the output end of the photovoltaic power converter, and is used to collect the terminal voltage of the sampling resistor at the output end of the photovoltaic power converter and the conversion voltage of the photovoltaic power converter, and convert the voltage signal from the temperature sensor and the voltage signals collected by itself into frequency signals.

[0020] The energy-taking device includes a plurality of current transformers and a rectifier bridge;

[0021] The plurality of current transformers are used to collect the alternating current output by the primary equipment;

[0022] The rectifier bridge is connected to one of the current transformers and is used to convert the alternating current of this path into direct current.

[0023] The alternating current output by the primary equipment obtained by the energy-taking device includes capacitor bank current, capacitor unbalance current, line current, platform flashover current, metal oxide varistor current, spark gap current and valve group current.

[0024] The control and protection device includes an acquisition module, an analysis module, a waveform recording module and a protection module;

[0025] The acquisition module is connected to the analog-to-digital conversion module and is used to obtain data frames from the analog-to-digital conversion module through a standard serial protocol;

[0026] The analysis module is connected to the acquisition module and is used to analyze the data frame and send the analyzed data to the waveform recording module and the protection module in the McBSP format;

[0027] The waveform recording module is connected to the analysis module and is used to record the waveforms of the data from the analysis module;

[0028] The protection module is connected to the analysis module and is used to protect the primary equipment based on the data from the analysis module.

[0029] The laser energy supply device includes a laser pump.

[0030] On the other hand, the present invention also provides an on-line monitoring method for power supply of a series compensation device, including:

[0031] The laser energy supply device generates laser;

[0032] The platform measurement device obtains a frequency signal based on the laser and outputs a data frame based on the frequency signal;

[0033] The control and protection device performs waveform recording on the primary equipment of the series compensation device based on the data frame, and protects the primary equipment when a fault occurs in the series compensation device or the power system.

[0034] Before the platform measuring device obtains a frequency signal based on laser and outputs a data frame based on the frequency signal, it includes:

[0035] When the primary equipment of the series compensation device is put into operation, the energy extraction device obtains the alternating current output by the primary equipment of the series compensation device and converts the alternating current into direct current.

[0036] The platform measuring device obtains a frequency signal based on laser and outputs a data frame based on the frequency signal, including:

[0037] The platform power supply module in the platform measuring device obtains a frequency signal based on laser and obtains serial data based on the frequency signal. At the same time, when the primary equipment of the series compensation device is withdrawn, the platform power supply module converts the laser into direct current;

[0038] The analog-to-digital conversion module in the platform measuring device converts the direct current from the platform power supply module or the direct current and alternating current from the energy extraction device into digital signals, and obtains a data frame based on the serial data and the digital signals.

[0039] The platform power supply module in the platform measuring device obtains a frequency signal based on laser and obtains serial data based on the frequency signal, including:

[0040] When the primary equipment is withdrawn, the photovoltaic power converter in the platform power supply module converts the laser into direct current and transmits the direct current to the analog-to-digital conversion module;

[0041] The acquisition module in the platform power supply module acquires the operating information of the photovoltaic power converter and converts the operating information into a frequency signal;

[0042] The FPGA module in the platform power supply module converts the frequency signal into serial data.

[0043] The acquisition module in the platform power supply module acquires the operating information of the photovoltaic power converter and converts the operating information into a frequency signal, including:

[0044] The temperature sensor in the acquisition module acquires the operating temperature of the photovoltaic power converter and converts the operating temperature into a voltage signal;

[0045] The voltage-frequency converter in the acquisition module acquires the terminal voltage of the sampling resistor at the output end of the photovoltaic power converter and the conversion voltage of the photovoltaic power converter, and converts the voltage signal from the temperature sensor and the voltage signals acquired by itself into a frequency signal.

[0046] When the primary equipment of the series compensation device is put into operation, the energy extraction device obtains the alternating current output by the primary equipment of the series compensation device and converts the alternating current into direct current, including:

[0047] Multiple current transformers in the energy acquisition module collect the alternating current output by the primary equipment;

[0048] The rectifier bridge in the energy acquisition module converts the alternating current from the current transformer into direct current.

[0049] The alternating current output by the primary equipment obtained by the energy acquisition device includes capacitor bank current, capacitor unbalance current, line current, platform flashover current, metal oxide varistor current, spark gap current, and valve group current.

[0050] The control and protection device performs waveform recording on the primary equipment of the series compensation device based on the data frame, and protects the primary equipment when a fault occurs in the series compensation device or the power system, including:

[0051] The acquisition module in the control and protection device obtains the data frame from the analog-to-digital conversion module through the standard serial protocol;

[0052] The parsing module in the control and protection device parses the data frame, and sends the parsed data to the waveform recording module and the protection module in the control and protection device in the McBSP format;

[0053] The waveform recording module records the data from the parsing module, and at the same time, the protection module protects the primary equipment based on the data from the parsing module.

[0054] The technical solution provided by the present invention has the following beneficial effects:

[0055] The energy supply on-line monitoring device for the series compensation device provided by the present invention includes a laser energy supply device, a platform measurement device, and a control and protection device; the output end of the laser energy supply device is connected to the input end of the platform measurement device, the output end of the platform measurement device is connected to the input end of the control and protection system, and the output end of the control and protection system is connected to the primary equipment of the series compensation device; the laser energy supply device is used to generate laser when the primary equipment is withdrawn; the platform measurement device is used to collect the operating temperature of the photovoltaic power converter, the terminal voltage of the output sampling resistor, and the conversion voltage when the primary equipment is put into operation, and obtain a frequency signal based on the collected information and the laser, and output a data frame based on the frequency signal; the control and protection device performs waveform recording on the primary equipment based on the data frame, and protects the primary equipment when a fault occurs in the series compensation device or the power system. By means of the platform measurement device and the control and protection device, the effective utilization rate of the series compensation device is improved, and the operation and maintenance time of the series compensation device is shortened;

[0056] The wave recording module in the present invention can record in real time the analog quantity collected by the current transformer in the energy taking device, the converted voltage of the photovoltaic power converter, the terminal voltage of the sampling resistor at the output end of the photovoltaic power converter, the operating temperature of the photovoltaic power converter, and the voltage signal converted by the temperature sensor, and thus can conveniently monitor the operating conditions of the laser energy transmission device and the photovoltaic power converter according to the recorded content;

[0057] The present invention realizes transient wave recording when the energy taking device and the laser energy transmission device are switched through the wave recording module, provides effective information for the analysis of the energy supply fault of the series compensation device, and provides an effective criterion for judging the operating life of the laser energy transmission device and the photovoltaic power converter;

[0058] The present invention can effectively shorten the maintenance time of the series compensation device and improve the effective utilization rate of the series compensation device. Brief Description of the Drawings

[0059] Figure 1 is the structure diagram of the on-line monitoring device for the energy supply of the series compensation device in the embodiment of the present invention;

[0060] Figure 2 is the structure schematic diagram of the energy taking device in the embodiment of the present invention;

[0061] Figure 3 is the structure schematic diagram of the acquisition module in the embodiment of the present invention;

[0062] Figure 4 is the schematic diagram of the voltage conversion frequency principle in the embodiment of the present invention;

[0063] Figure 5 is the flow chart of the on-line monitoring method for the energy supply of the series compensation device in the embodiment of the present invention. Detailed Embodiment

[0064] The present invention will be further described in detail below with reference to the drawings.

[0065] Embodiment 1

[0066] Embodiment 1 of the present invention provides an on-line monitoring device for the energy supply of a series compensation device, as Figure 1 shown, including a laser energy transmission device, a platform measurement device, and a control and protection device connected in sequence;

[0067] The laser energy transmission device is used to generate laser;

[0068] The platform measurement device is used to obtain a frequency signal based on the laser and output a data frame based on the frequency signal;

[0069] The control and protection device performs wave recording on the primary equipment of the series compensation device based on the data frame, and protects the primary equipment in case of a fault in the series compensation device or the power system.

[0070] The laser energy supply device includes a laser pump. The laser pump in the laser energy supply device and the photovoltaic power converter in the platform measurement device are expensive, and the cost of manufacturing the circuit board is high. The biggest enemies of the laser pump and the photovoltaic power converter are static electricity. After being discharged by static electricity, they usually do not break down immediately, but their performance gradually decreases during use. Secondly, since the laser energy supply optical fiber transmits strong light, when the cross-section of the fiber head gets dusty and is irradiated by strong light for a long time, the cross-section will burn and turn black after being burned, which directly affects the conversion efficiency of the photovoltaic power converter. In severe cases, this situation is similar to the occurrence of a broken energy supply optical fiber. Based on the above reasons, by mastering the conversion voltage and operating temperature of the photovoltaic power converter in real time, the operating conditions of the laser energy supply device can be intuitively reflected. By mastering the operating conditions of each laser energy supply in advance and preparing spare parts and supplies in a planned manner, the probability of sudden failures of the laser energy supply device can be reduced.

[0071] The on-line monitoring device for the energy supply of the series compensation device provided in Embodiment 1 of the present invention further includes an energy extraction device;

[0072] The energy extraction device is used to obtain the alternating current output by the primary equipment of the series compensation device when the primary equipment of the series compensation device is put into operation, and convert the alternating current into direct current.

[0073] The platform measurement device includes a platform power supply module and an analog-to-digital conversion module connected to the platform power supply module;

[0074] The platform power supply module is connected to the laser energy supply device, and is used to obtain a frequency signal based on the laser, obtain serial data based on the frequency signal, and is also used to convert the laser into direct current when the primary equipment of the series compensation device is withdrawn;

[0075] The analog-to-digital conversion module is used to convert the direct current from the platform power supply module or the direct current and alternating current from the energy extraction device into digital signals, and obtain a data frame based on the serial data and the digital signals. Among them, the direct current from the energy extraction device is the direct current converted by the rectifier bridge in the energy extraction device, and the alternating current from the energy extraction device is the alternating current collected by multiple current transformers in the energy extraction device.

[0076] The platform power supply module includes an acquisition module, a photovoltaic power converter, and an FPGA module;

[0077] The photovoltaic power converter is used to convert the laser into direct current when the primary equipment is withdrawn, and transmit the direct current to the analog-to-digital conversion module;

[0078] The acquisition module is connected to both the photovoltaic power converter and the photovoltaic power converter, and is used to acquire the operating information of the photovoltaic power converter and convert the operating information into a frequency signal;

[0079] The FPGA module is used to convert the frequency signal into serial data.

[0080] The specific structure of the acquisition module is as Figure 3 shown, Figure 3 where Rs is the sampling resistor at the output end of the photovoltaic power converter, V temp is the voltage signal converted by the temperature sensor, V0 is the conversion voltage of the photovoltaic power converter, V rs is the terminal voltage of the sampling resistor at the output end of the photovoltaic power converter.

[0081] The acquisition module includes a temperature sensor and a voltage-frequency converter connected to the temperature sensor;

[0082] The temperature sensor is set on the photovoltaic power converter, and is used to collect the working temperature of the photovoltaic power converter and convert the working temperature into a voltage signal; in Embodiment 1 of the present invention, the temperature sensor adopts LM35, V temp is the voltage signal converted by the temperature sensor, and V temp = T * 10mV / °C, T is the working temperature of the photovoltaic power converter collected by the temperature sensor. For example, if T is 30°C, then V temp is 0.3V. The temperature sensor can collect the temperature in the range of -50°C to +150°C, and the accuracy is maintained at 0.5°C.

[0083] The voltage-frequency converter is set at the output end of the photovoltaic power converter, and is used to collect the terminal voltage of the sampling resistor at the output end of the photovoltaic power converter and the conversion voltage of the photovoltaic power converter, and convert the voltage signal from the temperature sensor and the voltage signals collected by itself into frequency signals.

[0084] In Embodiment 1 of the present invention, there are three voltage-frequency converters. The first voltage-frequency converter collects the terminal voltage of the sampling resistor at the output end of the photovoltaic power converter and converts the terminal voltage into a frequency signal. The second voltage-frequency converter collects the conversion voltage of the photovoltaic power converter and converts the conversion voltage into a frequency signal. The third voltage-frequency converter converts the voltage signal of the temperature sensor into a frequency signal. The voltage-frequency converters in Embodiment 1 of the present invention all adopt LM331. The output frequency fout of LM331 = Vin * Ai, Vin represents the input quantity, Vin is V temp 、V0、V rs , and Ai represents the conversion coefficient.

[0085] The specific structure of the energy-taking device is as Figure 2 shown, Figure 2 where CT1 - CTN are N current transformers;

[0086] The energy acquisition device includes multiple current transformers and a rectifier bridge; the multiple current transformers and the rectifier bridge are independently installed and are all installed inside the platform measurement device;

[0087] The multiple current transformers are used to collect the alternating current output by the primary equipment;

[0088] The rectifier bridge is connected to one of the current transformers and is used to convert the alternating current of this path into direct current, and the alternating current collected by the remaining current transformers is directly transmitted to the analog-to-digital conversion module.

[0089] The alternating current output by the primary equipment obtained by the energy acquisition device includes capacitor bank current, capacitor unbalance current, line current, platform flashover current, metal oxide varistor current, spark gap current and valve group current.

[0090] In Embodiment 1 of the present invention, the rectifier bridge uses a thyristor KBPC2510, the current transformer uses a high-precision secondary through-core current transformer, specifically SCT254FK, the analog-to-digital conversion module uses an AD7675AST chip, and the FPGA module uses a Xilinx3S50AN chip.

[0091] The control and protection device includes an acquisition module, an analysis module, a waveform recording module and a protection module;

[0092] The acquisition module is connected to the analog-to-digital conversion module and is used to obtain data frames from the analog-to-digital conversion module through a standard serial protocol;

[0093] The analysis module is connected to the acquisition module and is used to analyze the data frame and send the analyzed data to the waveform recording module and the protection module in the McBSP format;

[0094] The waveform recording module is connected to the analysis module and is used to record the data from the analysis module by waveform recording;

[0095] The protection module is connected to the analysis module and is used to protect the primary equipment based on the data from the analysis module.

[0096] The waveform recording module in Embodiment 1 of the present invention can record in real time the analog quantity collected by the current transformer in the energy extraction device, the converted voltage of the photovoltaic power converter, the terminal voltage of the sampling resistor at the output end of the photovoltaic power converter, the operating temperature of the photovoltaic power converter, the voltage signal converted by the temperature sensor, and the start and stop of the laser energy transmission device. The waveform recording length is 300 cycles (maximum), the pre-waveform recording time is 500 ms, which is 25 power frequency cycles. That is, the magnitude of the energy extraction current 500 ms before the switching moment will also be recorded at the moment of starting waveform recording, so that the process of energy extraction switching can be clearly recorded. Subsequently, the operating conditions of the laser energy transmission device and the photovoltaic power converter can be conveniently monitored according to the recorded content, providing an effective criterion for judging the operating life of the laser energy transmission device and the photovoltaic power converter.

[0097] Embodiment 2

[0098] In the online monitoring device for supplying energy of the series compensation device provided in Embodiment 2 of the present invention, the platform measurement device collects the measurement analog quantity on the high-voltage capacitor platform and transmits the data to the control and protection device on the ground through optical fiber according to the standard serial communication protocol. The power supply of the platform measurement device is jointly composed of an energy extraction device and a laser energy transmission device. When the series compensation device is in the withdrawn state, the laser of the laser energy transmission device pumps and sends laser to the photovoltaic power converter of the platform power module in the platform measurement device, and the photovoltaic power converter converts the laser into direct current. The platform power module transmits the direct current generated by the laser channel to the analog-to-digital conversion module. When the series compensation device is in the inserted state, the CT in the energy extraction device extracts electricity, and similarly, the platform power module transmits the direct current extracted by the CT to the analog-to-digital conversion module.

[0099] The platform power module of the platform measurement device is provided with a working temperature, conversion current and voltage acquisition module for the photovoltaic power converter. This acquisition module can convert the three analog quantities of the working temperature, conversion current and voltage of the photovoltaic power converter into frequency signals and transmit them to the FPGA chip on the platform power module respectively.

[0100] The platform measurement device is provided with an acquisition module for CT energy extraction current and energy extraction voltage. This acquisition module can transmit the two analog quantities of CT energy extraction current and voltage to the analog-to-digital conversion module respectively.

[0101] The FPGA module in the platform power module of the platform measurement device transmits the collected multiple frequency signals to the analog-to-digital conversion module in the form of serial data. At the same time, the analog-to-digital conversion module collects multiple analog quantities on the high-voltage capacitor platform and then performs analog-to-digital conversion. The analog-to-digital conversion module combines the received multiple frequency signals and the digital signals representing multiple analog quantities to form a data frame and sends it to the control and protection device according to the serial protocol data format.

[0102] By controlling the oscillograph power supply of the protection device, record the transient process during the mutual switching of CT energy extraction and laser energy transmission of the platform measurement device, record the CT energy extraction current and voltage conditions, and record information such as the operating temperature, current, and voltage conversion conditions of the laser pump and photovoltaic power converter.

[0103] The sampling schematic diagram of the CT energy extraction current and the energy extraction voltage is as Figure 2 shown. Collect the CT energy extraction current flowing through the rectifier bridge, pass the CT wiring through the high-precision secondary through-hole CT for analog quantity acquisition, and Figure 2 introduce the output voltage of the rectifier bridge into the platform analog-to-digital conversion module, and the voltage analog quantity can be directly collected.

[0104] Laser pumps and photovoltaic power converters are expensive, and the cost of making circuit boards is high. After such devices are subjected to electrostatic discharge, they usually do not break down immediately, but their performance gradually decreases during use. Secondly, since the laser energy transmission fiber transmits strong light, when the cross-section of the fiber head gets dusty and is irradiated by strong light for a long time, the cross-section will burn and turn black after being burned, which directly affects the conversion efficiency of the photovoltaic power converter. In severe cases, this situation is similar to the occurrence of a broken energy transmission fiber. Based on the above reasons, by mastering the conversion voltage and operating temperature of each photovoltaic power converter in real time, the operating conditions of the energy transmission system can be intuitively reflected. By mastering the operating conditions of each laser energy supply in advance and preparing spare parts planned, the probability of sudden failures in the measurement energy supply system can be reduced.

[0105] The acquisition of the operating temperature, conversion current, and voltage of the photovoltaic power converter is as Figure 3 shown. The temperature acquisition of the photovoltaic power converter is obtained through the LM35 sensor attached to its surface. The LM35 sensor can convert the collected temperature analog signal into a voltage signal, and the calculation method is V temp = actual temperature * 10 mV / °C. For example, when the ambient temperature is 30 °C, the output voltage is 0.3 V. The LM35 sensor can collect temperatures in the range of -50 °C to +150 °C, and the accuracy is maintained at 0.5 °C. Collect the voltage V s across the sampling resistor R rs , and the conversion voltage of the photovoltaic power converter can be directly collected from its output side port, and the voltage is V0.

[0106] The voltage conversion frequency principle is as Figure 4 shown, representing the voltage signal V temp converted by the temperature sensor, and the terminal voltage V rs of the sampling resistor at the output end of the photovoltaic power converterThe conversion voltages V of the temperature sensor and the photovoltaic power converter also need to be converted into frequency signals for easy identification by the FPGA. In the present invention, an LM331 voltage-to-frequency conversion chip is used to convert the voltage signal into a frequency signal, and the FPGA uses a Xilinx 3S50AN chip.

[0107] The voltage signal V converted by the temperature sensor temp and the terminal voltage V of the sampling resistor at the output end of the photovoltaic power converter rs and the conversion voltage V0 of the photovoltaic power converter have the same principle for converting the frequency of these three voltage signals. The calculation method of the output frequency fout of the LM331 voltage-to-frequency conversion chip is fout = Vin * Ai, where Vin represents the input voltage and Ai represents the conversion coefficient. In Embodiment 2 of the present invention, the rectifier bridge uses a thyristor KBPC2510, the high-precision secondary through-core CT uses an SCT254FK, the AD conversion uses an AD7675AST chip, the FPGA uses a Xilinx 3S50AN chip, the temperature sensor uses an LM35, and the voltage-to-frequency converter uses an LM331.

[0108] Embodiment 2 of the present invention has a waveform recording function, that is, when the CT and laser of the series compensation device are switched, the control protection system will have a waveform recording function. The recording length is 300 cycles (maximum), the pre-recording time is 500 ms, and 25 power frequency cycles. That is, the magnitude of the energy-taking current taken 500 ms before the switching moment will also be recorded at the starting moment of the waveform recording, so that the process of the energy-taking switching can be clearly recorded.

[0109] Embodiment 3

[0110] Embodiment 3 of the present invention provides an online monitoring method for the energy supply of a series compensation device. The specific flowchart is as Figure 5 shown, and the specific process is as follows:

[0111] S101: The laser energy supply device generates laser light;

[0112] S102: The platform measurement device obtains a frequency signal based on the laser and outputs a data frame based on the frequency signal;

[0113] S103: The control protection device performs waveform recording on the primary equipment of the series compensation device based on the data frame and protects the primary equipment when a fault occurs in the series compensation device or the power system.

[0114] Before the platform measurement device obtains a frequency signal based on the laser and outputs a data frame, it includes:

[0115] The energy-taking device obtains the alternating current output by the primary equipment of the series compensation device when the primary equipment of the series compensation device is put into operation and converts the alternating current into direct current.

[0116] The platform measurement device obtains a frequency signal based on laser and outputs a data frame based on the frequency signal, including:

[0117] The platform power supply module in the platform measurement device obtains a frequency signal based on laser, obtains serial data based on the frequency signal, and at the same time, the platform power supply module converts the laser into direct current when the primary equipment of the series compensation device exits;

[0118] The analog-to-digital conversion module in the platform measurement device converts the direct current from the platform power supply module or the direct current and alternating current from the energy harvesting device into digital signals, and obtains a data frame based on the serial data and the digital signals.

[0119] The platform power supply module in the platform measurement device obtains a frequency signal based on laser and obtains serial data based on the frequency signal, including:

[0120] The photovoltaic power converter in the platform power supply module converts the laser into direct current when the primary equipment exits and transmits the direct current to the analog-to-digital conversion module;

[0121] The acquisition module in the platform power supply module acquires the operating information of the photovoltaic power converter and converts the operating information into a frequency signal;

[0122] The FPGA module in the platform power supply module converts the frequency signal into serial data.

[0123] The acquisition module in the platform power supply module acquires the operating information of the photovoltaic power converter and converts the operating information into a frequency signal, including:

[0124] The temperature sensor in the acquisition module acquires the working temperature of the photovoltaic power converter and converts the working temperature into a voltage signal;

[0125] The voltage-frequency converter in the acquisition module acquires the terminal voltage of the sampling resistor at the output end of the photovoltaic power converter and the conversion voltage of the photovoltaic power converter, and converts the voltage signal from the temperature sensor and the voltage signals acquired by itself into a frequency signal.

[0126] The analog quantities acquired by the energy harvesting device include alternating current output by the primary equipment, capacitor bank current, capacitor unbalance current, line current, platform flashover current, metal oxide varistor current, spark gap current, and valve group current.

[0127] The energy harvesting device acquires the alternating current output by the primary equipment of the series compensation device when the primary equipment of the series compensation device is put into operation and converts the alternating current into direct current, including:

[0128] Multiple current transformers in the energy harvesting module acquire the alternating current output by the primary equipment;

[0129] The rectifier bridge in the energy acquisition module converts the alternating current from the current transformer into direct current.

[0130] The alternating current output by the primary equipment obtained by the current transformer includes capacitor bank current, capacitor unbalance current, line current, metal oxide varistor current, spark gap current, and valve bank current.

[0131] The control and protection device performs waveform recording on the primary equipment of the series compensation device based on the data frame, and protects the primary equipment during faults of the series compensation device or the power system, including:

[0132] The acquisition module in the control and protection device obtains the data frame from the analog-to-digital conversion module through the standard serial protocol;

[0133] The parsing module in the control and protection device parses the data frame, and sends the parsed data to the waveform recording module and the protection module in the control and protection device in the McBSP format;

[0134] The waveform recording module records the data from the parsing module, and at the same time, the protection module protects the primary equipment based on the data from the parsing module.

[0135] For the convenience of description, each part of the above-mentioned device is described separately as various modules or units according to functions. Of course, when implementing the present application, the functions of each module or unit can be implemented in the same or multiple software or hardware.

[0136] Those skilled in the art should understand that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memories, CD-ROMs, optical memories, etc.) containing computer-usable program codes.

[0137] The present application is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, and the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processors of general-purpose computers, special-purpose computers, embedded processors, or other programmable data processing devices to generate a machine, so that the instructions executed by the processors of the computer or other programmable data processing devices generate a device for realizing the functions specified in one Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0138] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to work in a particular manner, such that the instructions stored in the computer-readable memory produce a manufacture including an instruction device that implements the functions specified in one or more processes and / or blocks Figure 1 in the process Figure 1 or processes and / or boxes

[0139] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus so that a series of operational steps are performed on the computer or other programmable apparatus to produce a computer-implemented process, whereby the instructions executed on the computer or other programmable apparatus provide steps for implementing the functions specified in one or more processes and / or blocks Figure 1 in the process Figure 1 or processes and / or boxes

[0140] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Those of ordinary skill in the art can still modify or equivalently replace the specific implementation manners of the present invention with reference to the above embodiments. Any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention are within the protection scope of the present invention pending approval of the application.

Claims

1. An on-line monitoring device for the energy supply of a series compensation device, characterized in that, It includes a laser energy supply device, a platform measurement device and a control and protection device; the output end of the laser energy supply device is connected to the input end of the platform measurement device, the output end of the platform measurement device is connected to the input end of the control and protection system, and the output end of the control and protection system is connected to the primary equipment of the series compensation device; The laser energy supply device is used to generate laser when the primary equipment is out of service; The platform measurement device is used to collect the working temperature of the photovoltaic power converter, the terminal voltage of the sampling resistor at the output end and the conversion voltage when the primary equipment is put into service, obtain a frequency signal based on the collected information and the laser, and output a data frame based on the frequency signal; The control and protection device performs waveform recording on the primary equipment based on the data frame and protects the primary equipment when a fault occurs in the series compensation device or the power system; An energy acquisition device is also provided at the input end of the platform measurement device; The energy acquisition device is used to obtain the alternating current output by the primary equipment of the series compensation device when the primary equipment of the series compensation device is put into service and convert the alternating current into direct current; The platform measurement device includes a platform power supply module and an analog-to-digital conversion module connected to the platform power supply module; The platform power supply module is connected to the laser energy supply device, and is used to obtain a frequency signal based on the laser, obtain serial data based on the frequency signal, and is also used to convert the laser into direct current when the primary equipment of the series compensation device is out of service; The analog-to-digital conversion module is used to convert the direct current from the platform power supply module or the direct current and alternating current from the energy acquisition device into digital signals, and obtain a data frame based on the serial data and the digital signals; The platform power supply module includes an acquisition module, a photovoltaic power converter and an FPGA module; The photovoltaic power converter is used to convert the laser into direct current when the primary equipment is out of service and transmit the direct current to the analog-to-digital conversion module; The acquisition module is connected to the photovoltaic power converter, and is used to collect the operation information of the photovoltaic power converter and convert the operation information into a frequency signal; The FPGA module is used to convert the frequency signal into serial data.

2. The on-line monitoring device for the energy supply of the series compensation device according to claim 1, characterized in that, The acquisition module includes a temperature sensor and a voltage-to-frequency converter connected to the temperature sensor; The temperature sensor is arranged on the photovoltaic power converter and is used to collect the working temperature of the photovoltaic power converter and convert the working temperature into a voltage signal; The voltage-to-frequency converter is arranged at the output end of the photovoltaic power converter and is used to collect the terminal voltage of the sampling resistor at the output end of the photovoltaic power converter and the conversion voltage of the photovoltaic power converter, and convert the voltage signal from the temperature sensor and the voltage signals collected by itself into a frequency signal.

3. The on-line monitoring device for power supply of the series compensation device according to claim 1, characterized in that, The energy acquisition device includes a plurality of current transformers and a rectifier bridge; The plurality of current transformers are used to collect the alternating current output by the primary equipment; The rectifier bridge is connected to one of the current transformers and is used to convert the alternating current of this path into direct current.

4. The on-line monitoring device for the energy supply of the series compensation device according to claim 1, characterized in that, The alternating current output by the primary equipment obtained by the energy acquisition device includes capacitor bank current, capacitor unbalance current, line current, platform flashover current, metal oxide varistor current, spark gap current and valve group current.

5. The on-line monitoring device for the energy supply of the series compensation device according to claim 1, characterized in that, The control and protection device includes an acquisition module, an analysis module, a waveform recording module and a protection module; The acquisition module is connected to the analog-to-digital conversion module and is used to obtain a data frame from the analog-to-digital conversion module through a standard serial protocol; The parsing module is connected to the acquisition module and is used to parse the data frame and send the parsed data to the waveform recording module and the protection module in the McBSP format; The waveform recording module is connected to the parsing module and is used to record the waveforms of the data from the parsing module; The protection module is connected to the parsing module and is used to protect the primary equipment based on the data from the parsing module.

6. The on-line monitoring device for the energy supply of the series compensation device according to claim 1, characterized in that, The laser energy transmission device includes a laser pump.

7. An online monitoring method for the energy supply of a series compensation device, characterized in that, Including: The laser energy transmission device generates laser light; The platform measurement device obtains a frequency signal based on the laser light and outputs a data frame based on the frequency signal; The control and protection device performs waveform recording on the primary equipment of the series compensation device based on the data frame and protects the primary equipment in case of a fault in the series compensation device or the power system; Before the platform measurement device obtains a frequency signal based on the laser light and outputs a data frame based on the frequency signal, it includes: The energy harvesting device obtains the alternating current output by the primary equipment of the series compensation device when the primary equipment of the series compensation device is put into operation and converts the alternating current into direct current; When the platform measurement device obtains a frequency signal based on the laser light and outputs a data frame based on the frequency signal, it includes: The platform power supply module in the platform measurement device obtains a frequency signal based on the laser light and obtains serial data based on the frequency signal. At the same time, the platform power supply module converts the laser light into direct current when the primary equipment of the series compensation device is taken out of service; The analog-to-digital conversion module in the platform measurement device converts the direct current from the platform power supply module or the direct current and alternating current from the energy harvesting device into digital signals and obtains a data frame based on the serial data and the digital signals; When the platform power supply module in the platform measurement device obtains a frequency signal based on the laser light and obtains serial data based on the frequency signal, it includes: The photovoltaic power converter in the platform power supply module converts the laser light into direct current when the primary equipment is taken out of service and transmits the direct current to the analog-to-digital conversion module; The acquisition module in the platform power supply module acquires the operating information of the photovoltaic power converter and converts the operating information into a frequency signal; The FPGA module in the platform power supply module converts the frequency signal into serial data.

8. The online monitoring method for the energy supply of the series compensation device according to claim 7, characterized in that When the acquisition module in the platform power supply module acquires the operating information of the photovoltaic power converter and converts the operating information into a frequency signal, it includes: The temperature sensor in the acquisition module acquires the operating temperature of the photovoltaic power converter and converts the operating temperature into a voltage signal; The voltage-frequency converter in the acquisition module acquires the terminal voltage of the sampling resistor at the output end of the photovoltaic power converter and the conversion voltage of the photovoltaic power converter, and converts the voltage signal from the temperature sensor and the voltage signals acquired by itself into a frequency signal.

9. The on-line monitoring method for the energy supply of the series compensation device according to claim 7, characterized in that, When the energy harvesting device obtains the alternating current output by the primary equipment of the series compensation device when the primary equipment of the series compensation device is put into operation and converts the alternating current into direct current, it includes: Multiple current transformers in the energy harvesting module acquire the alternating current output by the primary equipment; The rectifier bridge in the energy harvesting module converts the alternating current from the current transformer into direct current.

10. The online monitoring method for the energy supply of the series compensation device according to claim 7, characterized in that, The alternating current output by the primary equipment obtained by the energy acquisition device includes capacitor bank current, capacitor unbalance current, line current, platform flashover current, metal oxide varistor current, spark gap current, and valve bank current.

11. The on-line monitoring method for the energy supply of the series compensation device according to claim 7, characterized in that, The control and protection device performs waveform recording on the primary equipment of the series compensation device based on the data frame, and protects the primary equipment in case of faults in the series compensation device or the power system, including: The acquisition module in the control and protection device obtains the data frame from the analog-to-digital conversion module through the standard serial protocol; The parsing module in the control and protection device parses the data frame, and sends the parsed data to the waveform recording module and the protection module in the control and protection device in the McBSP format; The waveform recording module records the data from the parsing module, and at the same time, the protection module protects the primary equipment based on the data from the parsing module.

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