An online monitoring system for 500kV substation main transformer

Abstract

The present invention relates to an online monitoring system for a main transformer of a 500kV substation, which solves the defect that the main transformer online monitoring system fails to realize effective data processing compared with the prior art. In the present invention, the second photoelectric coupler is used to realize electrical-to-photoelectric signal conversion to prevent electromagnetic interference, and the driving module is used to realize driving the monitoring module so that the monitoring module can realize operation monitoring, and the monitoring module is used to realize effective real-time monitoring of the system. The present invention realizes the transmission of information instructions through the first photoelectric coupler and the second photoelectric coupler, effectively reduces the influence of electromagnetic interference on signal transmission, and improves the accuracy and stability of information instructions; and when monitoring data information, the feedback module and the comparison module are used to realize the processing of data information, and realize feedback adjustment.

Description

Technical Field

[0001] The invention relates to the technical field of a 500kV substation main transformer, in particular to an online monitoring system for a 500kV substation main transformer. Background Art

[0002] A substation is a place in the power system that transforms voltage and current, receives and distributes electric energy. The substation in a power plant is a step-up substation, which boosts the electric energy generated by the generator and feeds it into the high-voltage power grid. When the substation is in operation, it is necessary to monitor the substation. However, various monitoring systems on the market still have various problems.

[0003] In the prior art, an online monitoring system for a 500kV substation main transformer disclosed in the authorization announcement number CN111650462A realizes online monitoring of the 500kV substation using transformer oil chromatography, and can directly realize online monitoring of the oil chromatography at the transformer site, and can monitor the transformer fault in real time.

[0004] However, it does not solve the problem that the existing substations are unable to effectively process the information collected by the system during monitoring, that is, they are unable to collect and process data information through optocouplers, cannot improve the anti-interference ability of data information, and cannot implement feedback adjustment of the system, and cannot use comparison modules to compare and process the feedback data information, and cannot perform control and adjustment by comparing the feedback data information. Summary of the invention

[0005] The purpose of the present invention is to solve the defect that the main transformer online monitoring system in the prior art fails to realize effective data processing, and to provide an online monitoring system for a 500kV substation main transformer to solve the above problem.

[0006] In order to achieve the above object, the technical solution of the present invention is as follows:

[0007] An online monitoring system for a main transformer of a 500kV substation comprises a control module, wherein the control module is electrically connected to a drive module via a second photoelectric coupler, and the drive module is electrically connected to a monitoring module. The control module is used to control and adjust the system and send out control signals. The second photoelectric coupler is used to realize electrical-to-photoelectric signal conversion to prevent electromagnetic interference. The drive module is used to drive the monitoring module so that the monitoring module can realize operation monitoring. The monitoring module is used to realize effective real-time monitoring of the system.

[0008] The monitoring module is electrically connected to a first photoelectric coupler through a pulse module, the first photoelectric coupler is electrically connected to a feedback module through a processing module, the feedback module is electrically connected to a comparison module, and the comparison module is electrically connected to the control module through an interface module; the pulse module is used to receive the monitoring signal of the monitoring module and output the monitoring signal in pulses, the first photoelectric coupler is used to realize electrical-to-photoelectric signal conversion to prevent electromagnetic interference, the processing module is used to realize signal reception and processing to improve the accuracy of data information, the feedback module adopts an open-loop feedback circuit, the feedback module is used to perform feedback adjustment through the monitored data information to improve the control and adjustment ability of the system, and the comparison module is used to compare the monitored data information with the set threshold to determine whether the system is in normal operation.

[0009] The control module is electrically connected to a voltage regulating module, the voltage regulating module is electrically connected to a switch module, the switch module is electrically connected to a power station module and a microgrid module, the microgrid module includes a solar power generation panel, a battery pack and an inverter, and the switch module adopts a single-pole double-throw switch.

[0010] The voltage regulation module includes a step-down circuit for reducing voltage, a rectifier circuit for converting AC voltage into DC voltage, a voltage stabilizing circuit for stabilizing voltage fluctuations, a filter circuit for filtering AC voltage from DC voltage, and an anti-surge circuit for preventing voltage peak impact.

[0011] The power station module includes two power stations, and the power supply is inductively supplied through the side low-voltage coil of the power station module. The power station module and the microgrid module are connected to the grid and connected to the voltage grid. The power station module and the microgrid module are electrically connected with a circuit breaker module, and the circuit breaker module is electrically connected with the drive module; the control module is electrically connected with an auxiliary module, and the auxiliary module includes a display, a control button, an alarm, an indicator light, a ventilator, an emergency ventilator, a charging screen, an inverter and a transformer cooling fan. The alarm adopts an audible and visual alarm. The ventilator and the emergency ventilator are used to realize ventilation and heat dissipation of the control room and the substation equipment room. The charging screen is used for the solar power generation panel to charge the battery pack. The inverter is used for the solar power generation panel to perform grid-connected regulation. The transformer cooling fan is used to realize cooling treatment of the transformer of the power station module;

[0012] The circuit breaker module includes a frame circuit breaker MT, a molded case circuit breaker NSX250, a molded case circuit breaker NSX100 and a miniature circuit breaker C65, and the monitoring module includes a current sampling circuit for monitoring a lightning rod, a shaft rotation angle monitor for a circuit breaker switch, a piezoelectric vibration sensor, an oil chromatogram online monitor, an iron core grounding current acquisition circuit, a monitoring camera and a temperature and humidity detector.

[0013] The control module is electrically connected to a storage module, and the storage module includes a cache memory for implementing data caching, a ROM memory for implementing storage of a program body for system operation, and a RAM memory for implementing storage of a system operation log.

[0014] The control module is electrically connected to the interface module, and the interface module includes an RS485 communication interface, a CAN bus interface and a USB interface. The RS485 communication interface is electrically connected to the communication module, the CAN bus interface is electrically connected to the equipment in the system, and the USB interface is used to realize electrical connection with external equipment; the communication module includes a wireless communicator, a Bluetooth communicator and an optical fiber communicator, the optical fiber communicator is communicatively connected to a cloud module, the wireless communicator is communicatively connected to a monitoring terminal, the cloud module is used to obtain or upload big data information, and the monitoring terminal is used to realize control and regulation of the entire power station.

[0015] The processing module includes an information receiving circuit, an information gain circuit, an information filtering circuit and an information conversion circuit. The information receiving circuit is used to receive the data information transmitted by the first photoelectric coupler, the information gain circuit is used to amplify the data information, the information filtering circuit is used to filter out clutter in the data information, and the information conversion circuit is used to convert the format of the data information.

[0016] Beneficial Effects

[0017] Compared with the prior art, the online monitoring system for a main transformer of a 500kV substation of the present invention realizes transmission of information instructions through a first photoelectric coupler and a second photoelectric coupler, effectively reduces the influence of electromagnetic interference on signal transmission, and improves the accuracy and stability of information instructions; and when monitoring data information, the data information is processed through a feedback module and a comparison module, and feedback regulation is realized.

[0018] The present invention realizes the transmission of data information through a photoelectric coupler so that the data information will not cause interference during transmission, and realizes the processing of data information through a processing module to improve the stability of data information and filter out clutter, and then processes it through a feedback module and a comparison module, and the feedback module realizes the transmission of data information through a feedback path, and realizes the comparison of the detected data information and a set threshold value through the comparison module, and outputs the compared data information, that is, by comparing the deviation between the system output and the expected behavior, and eliminating the deviation to obtain the expected system performance, it is convenient for the system to perform precise control and adjustment, and improve the operation and monitoring effects of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a block diagram of the electrical structure connection of the present invention. DETAILED DESCRIPTION

[0020] In order to have a further understanding and recognition of the structural features and the effects achieved by the present invention, a preferred embodiment and accompanying drawings are used for detailed description as follows:

[0021] like Figure 1 As shown, the online monitoring system for a main transformer of a 500kV substation described in the present invention includes a control module, the control module is electrically connected to a second photoelectric coupler, the second photoelectric coupler is electrically connected to a drive module, the drive module is electrically connected to a monitoring module, the control module is used to control and adjust the system and send out control signals, the second photoelectric coupler is used to realize electrical-to-photoelectric signal conversion to prevent electromagnetic interference, the drive module is used to drive the monitoring module so that the monitoring module can realize operation monitoring, and the monitoring module is used to realize effective real-time monitoring of the system.

[0022] The monitoring module is electrically connected to a pulse module, the pulse module is electrically connected to a first photoelectric coupler, the first photoelectric coupler is electrically connected to a processing module, the processing module is electrically connected to a feedback module, the feedback module is electrically connected to a comparison module, the comparison module is electrically connected to the control module through an interface module, the pulse module is used to receive the monitoring signal of the monitoring module, and output the monitoring signal in pulses. The first photoelectric coupler is used to realize electrical-to-photoelectric signal conversion to prevent electromagnetic interference, the processing module is used to realize signal reception and processing to improve the accuracy of data information, the feedback module adopts an open-loop feedback circuit, the feedback module is used to perform feedback adjustment through the monitored data information to improve the control and adjustment ability of the system, and the comparison module is used to compare the monitored data information with the set threshold to determine whether the system is in a normal operating state.

[0023] In order to realize power supply to the system, maintain stable operation of the system, and realize selective power supply. In this embodiment, preferably, the control module is electrically connected to a voltage regulating module, the voltage regulating module is electrically connected to a switch module, the switch module is electrically connected to a power station module and a microgrid module, the microgrid module includes a solar power generation panel, a battery pack and an inverter, and the switch module adopts a single-pole double-throw switch.

[0024] The photovoltaic array efficiency in the microgrid module refers to the ratio of the actual DC output power to the nominal power of the photovoltaic array under a solar radiation intensity of 1000W / m2.

[0025] The losses of photovoltaic arrays during energy conversion and transmission include:

[0026] Component matching loss: About 5% for a well-designed and carefully constructed system;

[0027] Solar radiation loss: including dust blocking on the surface of the module and unusable low and weak solar radiation loss, with a value of 5%;

[0028] Loss due to deviation from the maximum power point: such as the influence of temperature, maximum power point tracking (MPPT) accuracy, etc., with a value of 6%;

[0029] DC line loss: According to relevant standards, it should be less than 3%;

[0030] It can be obtained that: η1 = 95% × 95% × 94% × 97% = 82.3%;

[0031] The conversion efficiency of the inverter is η2

[0032] The ratio of the inverter's output AC power to its input DC power.

[0033] For the inverter efficiency of the selected model, η2=95.6%

[0034] AC grid-connected efficiency η3

[0035] The total efficiency of the system is equal to the product of the efficiencies of the above-mentioned parts. Taking into account unforeseen circumstances, a correction factor of 0.95 is generally considered. Finally, the product of the partial efficiencies is the total efficiency of the system, and the efficiency of this system is 74.77%.

[0036] Power generation calculation:

[0037] The installed power is 52.44kWp. Combined with the solar sunshine time and solar radiation at the project site, the photovoltaic power generation simulation calculation is as follows:

[0038] The total annual solar radiation received by the photovoltaic array is 1800.0kWh / m2, which is converted into about 4.9h of peak sunshine hours at the inclination angle;

[0039] The photovoltaic system generates approximately 52.44kWp×4.9h×74.77%=192.13kWh of electricity per day.

[0040] The power generation of the photovoltaic system in the first year is approximately: 192.13kWh×365=70127kWh;

[0041] Crystalline silicon photovoltaic modules will decay when used in sunlight and normal atmospheric environment. The system output decays by 0.5% per year over 25 years:

[0042] The total power generation of this system during its 25-year life cycle is 1,651,900 kWh.

[0043] In order to achieve stable power supply operation of the system, in this embodiment, preferably, the voltage regulation module includes a step-down circuit for reducing the voltage, a rectifier circuit for converting AC voltage into DC voltage, a voltage stabilizing circuit for stabilizing voltage fluctuations, a filter circuit for filtering out AC voltage in DC voltage, and a surge protection circuit for preventing voltage peak impacts.

[0044] In order to realize the grid-connected transmission of the voltage generated by the power station module and the microgrid module and realize power supply to the power grid, the power station module in this embodiment includes two power stations, and the side low-voltage coil of the power station module is used for inductive power supply. The power station module and the microgrid module are connected to the grid and connected to the voltage grid. The power station module and the microgrid module are electrically connected to a circuit breaker module, and the circuit breaker module is electrically connected to the drive module.

[0045] In order to realize auxiliary operation of the system, improve the operation stability of the control module, and facilitate operation control. In this embodiment, preferably, the control module is electrically connected with an auxiliary module, and the auxiliary module includes a display, a control button, an alarm, an indicator light, a ventilator, an emergency ventilator, a charging screen, an inverter and a transformer cooling fan. The alarm is an audible and visual alarm. The ventilator and the emergency ventilator are used to realize ventilation and heat dissipation of the control room and the substation equipment room. The charging screen is used for the solar power generation panel to charge the battery pack, the inverter is used for the solar power generation panel to perform grid-connected regulation, and the transformer cooling fan is used to realize the cooling treatment of the transformer of the power station module.

[0046] In order to store data information, in this embodiment, a storage module is electrically connected to the control module, and the storage module includes a cache memory for data caching, a ROM memory for storing the program body for system operation, and a RAM memory for storing the system operation log.

[0047] In order to enable the control module to perform effective device connection, in the present embodiment, preferably, the control module is electrically connected to the interface module, the interface module includes an RS485 communication interface, a CAN bus interface and a USB interface, the RS485 communication interface is electrically connected to the communication module, the CAN bus interface is electrically connected to the device in the system, and the USB interface is used to realize electrical connection to an external device.

[0048] In order to upload and download data information. In this embodiment, preferably, the communication module includes a wireless communicator, a Bluetooth communicator and an optical fiber communicator, the optical fiber communicator is connected to the cloud module, the wireless communicator is connected to the monitoring terminal, the cloud module is used to obtain or upload big data information, and the monitoring terminal is used to control and adjust the entire power station.

[0049] In order to process the data information and improve the accuracy of the data information. In this embodiment, preferably, the processing module includes an information receiving circuit, an information gain circuit, an information filtering circuit and an information conversion circuit, the information receiving circuit is used to receive the data information transmitted by the first photoelectric coupler, the information gain circuit is used to amplify the data information, the information filtering circuit is used to filter out the clutter in the data information, and the information conversion circuit is used to convert the format of the data information.

[0050] In order to control and adjust the over-stepping and monitor the system, in this embodiment, preferably, the circuit breaker module includes a frame circuit breaker MT, a molded case circuit breaker NSX250, a molded case circuit breaker NSX100 and a miniature circuit breaker C65, and the monitoring module includes a current sampling circuit for monitoring the lightning rod, a shaft rotation angle monitor for the circuit breaker switch, a piezoelectric vibration sensor, an oil chromatograph online monitor, a core grounding current acquisition circuit, a monitoring camera and a temperature and humidity detector.

[0051] Frame circuit breaker MT: Instantaneous protection shutdown, short circuit short delay setting multiple 5In, delay time is 400ms.

[0052] Molded case circuit breaker NSX250: Instantaneous protection shutdown, short-circuit short delay setting multiple 5In, delay time is 200ms.

[0053] Molded case circuit breaker NSX100: Instantaneous protection shutdown, short circuit short delay setting multiple 10In, delay time is 60ms.

[0054] Miniature circuit breaker C65: Instantaneous multiple C type (5-10In).

[0055] The working principle and use process of the present invention are as follows:

[0056] When in use, the power station module and the microgrid module are powered by the switch module, and the voltage is converted and adjusted by the voltage regulating module, so that the voltage can adapt to the operation of the control module, and the control module sends a control instruction through the second photoelectric coupler, and drives the monitoring module through the drive module, so that the monitoring module can monitor the system, and the detection equipment includes a current sampling circuit for monitoring the lightning rod, a shaft rotation angle monitor for the circuit breaker switch, a piezoelectric vibration sensor, an oil chromatogram online monitor, an iron core grounding current acquisition circuit, a monitoring camera and a temperature and humidity detector to monitor the entire system, and then the monitoring module uses the pulse mode The block transmits the detected data information to the first photoelectric coupler in the form of pulse information to maintain the accuracy of the data information, and receives, amplifies, filters and converts the data information through the processing module, and then processes it through the feedback module and the comparison module, and the feedback module transmits the data information through the feedback path, and compares the detected data information with the set threshold through the comparison module, and outputs the compared data information, that is, by comparing the deviation between the system output and the expected behavior, and eliminating the deviation to obtain the expected system performance, and the system can upload and download the data information to the cloud module through the communication module, and can transmit the information to the monitoring terminal to achieve monitoring.

[0057] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. An online monitoring system for a 500kV substation main transformer, characterized in that: It includes a control module, the control module is electrically connected to the driving module through a second photoelectric coupler, the driving module is electrically connected to a monitoring module, the control module is used to control and adjust the system and send out a control signal, the second photoelectric coupler is used to realize electrical-to-optical signal conversion to prevent electromagnetic interference, the driving module is used to drive the monitoring module so that the monitoring module can realize operation monitoring, and the monitoring module is used to realize effective real-time monitoring of the system; The monitoring module is electrically connected to a first photoelectric coupler through a pulse module, the first photoelectric coupler is electrically connected to a feedback module through a processing module, the feedback module is electrically connected to a comparison module, and the comparison module is electrically connected to the control module through an interface module; the pulse module is used to receive a monitoring signal from the monitoring module and output the monitoring signal in pulses, the first photoelectric coupler is used to realize electrical-to-photoelectric signal conversion to prevent electromagnetic interference, the processing module is used to realize signal reception and processing to improve the accuracy of data information, the feedback module adopts an open-loop feedback circuit, the feedback module is used to perform feedback regulation through the monitored data information to improve the control and regulation ability of the system, and the comparison module is used to compare the monitored data information with a set threshold to determine whether the system is in a normal operating state; The control module is electrically connected to a voltage regulating module, the voltage regulating module is electrically connected to a switch module, the switch module is electrically connected to a power station module and a microgrid module, the microgrid module includes a solar power generation panel, a battery pack and an inverter, and the switch module adopts a single-pole double-throw switch; The voltage regulating module includes a step-down circuit for reducing voltage, a rectifier circuit for converting AC voltage into DC voltage, a voltage stabilizing circuit for stabilizing voltage fluctuations, a filter circuit for filtering AC voltage from DC voltage, and an anti-surge circuit for preventing voltage peak impact; The power station module includes two power stations, and the power supply is inductively supplied through the side low-voltage coil of the power station module. The power station module and the microgrid module are connected to the grid and connected to the voltage grid. The power station module and the microgrid module are electrically connected with a circuit breaker module, and the circuit breaker module is electrically connected with the drive module; the control module is electrically connected with an auxiliary module, and the auxiliary module includes a display, a control button, an alarm, an indicator light, a ventilator, an emergency ventilator, a charging screen, an inverter and a transformer cooling fan. The alarm adopts an audible and visual alarm. The ventilator and the emergency ventilator are used to realize ventilation and heat dissipation of the control room and the substation equipment room. The charging screen is used for the solar power generation panel to charge the battery pack. The inverter is used for the solar power generation panel to perform grid-connected regulation. The transformer cooling fan is used to realize cooling treatment of the transformer of the power station module; The circuit breaker module includes a frame circuit breaker MT, a molded case circuit breaker NSX250, a molded case circuit breaker NSX100 and a miniature circuit breaker C65, and the monitoring module includes a current sampling circuit for monitoring a lightning rod, a shaft rotation angle monitor for a circuit breaker switch, a piezoelectric vibration sensor, an oil chromatogram online monitor, an iron core grounding current acquisition circuit, a monitoring camera and a temperature and humidity detector.

2. The online monitoring system for a 500 kV substation main transformer according to claim 1, characterized in that: The control module is electrically connected to a storage module, and the storage module includes a cache memory for implementing data caching, a ROM memory for implementing storage of a program body for system operation, and a RAM memory for implementing storage of a system operation log.

3. The online monitoring system for a 500kV substation main transformer according to claim 1, characterized in that: The control module is electrically connected to the interface module, and the interface module includes an RS485 communication interface, a CAN bus interface and a USB interface. The RS485 communication interface is electrically connected to the communication module, the CAN bus interface is electrically connected to the equipment in the system, and the USB interface is used to realize electrical connection with external equipment; the communication module includes a wireless communicator, a Bluetooth communicator and an optical fiber communicator, the optical fiber communicator is communicatively connected to a cloud module, the wireless communicator is communicatively connected to a monitoring terminal, the cloud module is used to obtain or upload big data information, and the monitoring terminal is used to realize control and regulation of the entire power station.

4. The online monitoring system for a 500 kV substation main transformer according to claim 1, characterized in that: The processing module includes an information receiving circuit, an information gain circuit, an information filtering circuit and an information conversion circuit. The information receiving circuit is used to receive the data information transmitted by the first photoelectric coupler, the information gain circuit is used to amplify the data information, the information filtering circuit is used to filter out clutter in the data information, and the information conversion circuit is used to convert the format of the data information.

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