A multifunctional intelligent box-type transformer monitoring device and system for new energy power stations

Abstract

The present invention discloses a multifunctional intelligent box-type transformer monitoring device and system for a new energy power station, which relates to the field of new energy power generation technology. The device includes a reinforced unit chassis, which is internally provided with an AC plug-in, a CPU plug-in, an input plug-in, a signal plug-in, a human-machine dialogue plug-in, and a communication plug-in; the system includes an analog quantity acquisition module, a protection function module, a remote control module, a communication function module, and a temperature acquisition function module. The present invention realizes the centralization and transmission of communication information of intelligent devices belonging to the photovoltaic power generation subsystem, and accesses the booster station integrated self-system through a self-healing annular optical fiber Ethernet, thereby realizing remote management and automatic monitoring of the photovoltaic power generation unit or wind farm by the booster station, meeting the comprehensive intelligentization and "unmanned and less-manned" operation and management mode of photovoltaic power stations and wind farms.

Description

Technical Field

[0001] The present invention relates to the technical field of renewable energy power generation, and in particular to a multifunctional intelligent box-type transformer monitoring device and system for renewable energy power stations. Background Art

[0002] In recent years, my country's new energy industry has developed rapidly, especially solar energy and wind energy. With the strong support of national policies, it has entered a rapid development stage. In the process of development, related supporting facilities and technologies are particularly important. Take the monitoring of box transformers in wind farms as an example. With the rapid development of the wind power industry, the non-intelligence of 35kV box transformers has become the biggest obstacle to the automation process of wind farms. Various information in the box transformers cannot be uploaded to the central control room in real time, making the box transformers a monitoring blind spot for wind farms, which has brought great inconvenience to the safe production and daily maintenance of wind farms, especially hidden dangers to equipment and personal safety.

[0003] At present, the communication between junction boxes, inverters, box transformers and other equipment in most photovoltaic power generation units is to send information to the communication management machine first, and then upload it to the integrated automatic system through the optical fiber transceiver. This makes the wiring of the entire system too complicated, increases the possibility of failure, and also increases the investment cost of the enterprise, which is not conducive to the future troubleshooting of system failures.

[0004] The Chinese patent with the authorization announcement number CN 204597628 U discloses a box-type transformer intelligent monitoring device and an intelligent monitoring system. The device is arranged in a box-type transformer, and includes a processing unit, a 485 communication unit, a sampling unit and a protocol conversion unit. The processing unit is connected to the sampling unit and the 485 communication unit, and the operating parameters of the box-type transformer collected by the sampling unit are sent to the 485 communication unit. The protocol conversion unit is respectively connected to the inverter, the junction box and the 485 communication unit, and receives the operating parameters of the box-type transformer sent by the 485 communication unit, the operating parameters of the inverter sent by the inverter, and the operating parameters of the junction box sent by the junction box, and unifies the communication protocol format definition of the operating parameters of the box-type transformer, the inverter and the junction box into the same communication protocol format definition. The intelligent monitoring system includes: an inverter, a junction box and the box-type transformer intelligent monitoring device, and uses a protocol conversion unit to replace a communication management machine, thereby reducing ports and reducing costs.

[0005] Although the intelligent monitoring device and intelligent monitoring system for box-type transformers developed by the above technology integrate a protocol conversion unit in the box-type transformer intelligent monitoring device to replace the external communication management machine, the communication port of the protocol conversion unit can be set according to the needs of the photovoltaic power station, and unnecessary ports can be cut to reduce costs, but the transmission rate and distance are limited, and cannot meet the needs of modern power stations for real-time data monitoring and remote control. Therefore, further developing a multifunctional intelligent box-type transformer monitoring device and system that can enhance anti-interference capabilities and effectively improve data transmission efficiency has become an inevitable trend in technological development. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a multifunctional intelligent box transformer monitoring device and system for a new energy power station, so as to enhance the anti-interference capability and effectively improve the data transmission efficiency.

[0007] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows:

[0008] A multifunctional intelligent box-type transformer monitoring device for a new energy power station comprises an enhanced unit chassis, which is internally provided with an AC plug-in, a CPU plug-in, an input plug-in, a signal plug-in, a human-machine dialogue plug-in and a communication plug-in, wherein the CPU plug-in adopts a multilayer printed circuit board and a surface mounting process; the communication plug-in comprises 10 RS485 master station interfaces and 2 optical fiber Ethernet interfaces, and the 10 RS485 interfaces are connected to intelligent devices such as inverters and combiner boxes, each RS485 interface can be connected to 32 devices, the transmission rate is 300bps-115200bps, the transmission distance is up to 1000 meters, and multiple protocols such as IEC60870-5-101, IEC60870-5-104, Modbus, CDT, 9702 and private protocols are supported; the enhanced unit chassis does not need to be equipped with an AC or DC input anti-interference module, and the enhanced unit chassis panel includes a large-screen LCD display, a signal indicator light and an operation keyboard, which can adapt to a wide temperature working environment of -40°C to 70°C.

[0009] Further preferably, the AC plug-in includes a current converter TA and a voltage converter TV, which are used to convert the secondary side current and voltage signals of the system TA and TV into weak current signals for conversion by the CPU plug-in; the CPU plug-in includes data sampling processing, communication and protection components; the input plug-in provides 24 inputs, and the working voltage is AC220V / DC220 / 110V; the signal plug-in includes the power supply element of the device and 8 programmable standby relay outlets; the human-machine dialogue plug-in is installed on the panel of the multifunctional intelligent box-type transformer monitoring device, and the human-machine dialogue plug-in adopts a large-screen LCD display, and a full Chinese menu mode for display and operation, including keyboard operation, liquid crystal display, etc. Crystal display, signal light indication; the 2-way fiber optic Ethernet interface of the communication plug-in forms a self-healing fiber optic ring network, the fiber optic Ethernet interface is single-mode or multi-mode SC / ST / FC type, the wavelength is 1310nm, the transmission distance is 50km, the communication protocol adopts IEC60870-5-104, for a single smart device data, to achieve a variety of protocols to IEC60870-5-104 unified conversion and transmission, access to the mainstream power station monitoring system; the smart device includes inverter, combiner box; the multiple protocols include IEC60870-5-101, IEC60870-5-104, Modbus, CDT, 9702, private protocol.

[0010] A multifunctional intelligent box-type transformer monitoring system for a new energy power station, which is a software execution system mounted in an intelligent box-type transformer monitoring device, including an analog quantity acquisition module, a protection function module, a remote control module, a communication function module, and a temperature acquisition function module. The analog quantity acquisition module acquires electrical quantity signals in real time, the protection function module monitors various operating parameters and states of the power system in real time, the remote control module allows operators to monitor and control the box-type transformer remotely, the communication function module uploads fault information in time through different communication media, and the temperature acquisition function module acquires 4-20MA information output by 6-channel thermal resistors or temperature transmitters to monitor the temperatures at multiple locations in the box-type transformer.

[0011] Further preferably, the analog quantity acquisition module converts the current and voltage signals of the system into weak current signals suitable for processing by the CPU plug-in through an AC plug-in, samples and processes data through the CPU plug-in, and collects electrical quantity signals on the low-voltage side of the transformer, wherein the electrical quantity signals include three-phase current, three-phase voltage, frequency, power factor, active power and reactive power.

[0012] Further preferably, the protection function module includes a non-electrical quantity protection function unit, a device fault alarm function unit, a telemetering, telesignaling, remote control and remote pulse function unit, and an electrical quantity protection function unit; the non-electrical quantity protection function unit is provided with 10 non-electrical quantity protections, which are controlled by a soft pressure plate, the output delay is set, and tripping or alarm is selected. After the non-electrical quantity tripping or alarming, the fault state persists, and the tripping signal or alarm signal will be maintained until the non-electrical quantity fault state is lifted, and then the reset key is pressed to reset the tripping signal or alarm signal; the device fault alarm function unit includes when the hardware of the multifunctional intelligent box transformer monitoring device fails, the large-screen LCD screen displays the corresponding fault information, and the drive device alarm relay , locked protection, the alarm light can be restored after the fault is handled and the power is restored; the telemetering, telesignaling, remote control and remote pulse function units include remote monitoring of the operating parameters of electrical equipment, remote reception and display of the signal status of the equipment, remote control of the operation of electrical equipment, and remote transmission of pulse signals; the electrical quantity protection function unit includes differential quick-break protection function, ratio differential protection function, differential current overload protection function, overcurrent one stage, overcurrent two stages, overcurrent three stages protection function, overload protection function, PT line break protection function, overvoltage protection function, undervoltage protection function, CT line break function, single-phase grounding function, zero-sequence current protection function, and negative-sequence current protection.

[0013] Further preferably, the telemetry includes measuring the box variable high, the first group of current A phase IA1 on the low voltage side, the first group of current B phase IB1, the first group of current C phase IC1, the first group of voltage A phase UA1, the first group of voltage B phase UB1, the first group of voltage C phase UC1, the first group of voltage AB phase UAB1, the first group of voltage BC phase UBC1, the first group of voltage CA phase UCA1, the first group of active power P1, the first group of reactive power Q1, the first group of frequency f1, the first group of power factor COSφ1, the second group of current A phase IA2, the second group of current B phase IB2, the second group of current C phase IC2, the first group of The second group of voltages are A phase UA2, the second group of voltages are B phase UB2, the second group of voltages are C phase UC2, the second group of voltages between AB phases UAB2, the second group of voltages between BC phases UBC2, the second group of voltages between CA phases UCA2, the second group of active power P2, the second group of reactive power Q2, the second group of frequencies f2, and the second group of power factors COSφ2; the telesignals include various protection action signals and circuit breaker position telesignals and input telesignals; the remote control includes remote control of tripping / closing, pressure plate insertion and withdrawal, and modification of set values; the telepulse includes remote reading of the pulse output of the watt-hour meter and transmission of the pulse signal of the electric energy consumption for remote metering.

[0014] Further preferably, the remote control module provides a user interface for remote control through a human-computer dialogue plug-in, provides RS485 and optical fiber Ethernet interfaces through a communication plug-in, and supports the reception and execution of remote control commands.

[0015] Further preferably, the communication function module integrates 10 RS485 master station interfaces and 2 fiber optic Ethernet interfaces through a communication plug-in, supports multiple communication protocols, and realizes the collection and transmission of data information; realizes the centralization and transmission of communication information of intelligent devices belonging to the photovoltaic power generation electronic system through a built-in communication management machine, provides photoelectric conversion function, and supports the establishment of a self-healing fiber optic ring network.

[0016] Further preferably, the multifunctional intelligent box-type transformer monitoring system also includes a grounding safety detection module, and the data structure of the grounding safety detection module includes: a discrete data layer; a continuous data layer; a linear data layer; a vector data layer; and a grounding current variation characterization data layer.

[0017] Further preferably, the data processing process of the grounding safety detection module is:

[0018] a. Power supply: set a constant micro power supply to provide weak current;

[0019] b. Data acquisition: The current data points are acquired at a fixed sampling frequency through the current sensor to form a discrete data layer , where the subscript corresponds to the sampling interval ∆t1;

[0020] c. Data interpolation: interpolate discrete data layers and fit them into continuous functions , forming a continuous data layer , where the superscript corresponds to the artificially selected larger interval ∆t2;

[0021] d. Series expansion: Perform Taylor series expansion on the continuous function I(t) to obtain the linear data layer ;

[0022] e. Vector data layer: extract the first k items from the linear data layer to generate n k-dimensional vectors , respectively , The subscript is the same as above The superscripts of are consistent;

[0023] f. Vector analysis: Based on the analysis of vector data, the variation characteristics of the grounding current are characterized by data to obtain the grounding current variation characterization data; the specific algorithm process is: through the direction, length or composite data relationship of the direction and length of the k-dimensional vector in different ∆t2 intervals, the variability of the grounding current in two or more corresponding ∆t2 intervals is numerically characterized; finally, the obtained data representation is compared with the pre-set fixed threshold or feedback adjustable threshold, and based on the data comparison results, it is determined whether the variation degree of the grounding current meets the warning or maintenance standards.

[0024] The beneficial effects of adopting the above technical solution are:

[0025] The present invention adopts a reinforced unit chassis design, without the need to add additional AC and DC input anti-interference modules, and can work stably in a wide temperature environment of -40°C to 70°C, ensuring the reliability of the equipment under harsh conditions;

[0026] The device of the present invention realizes the comprehensive functions of data collection, processing, communication and user interaction by integrating AC plug-in, CPU plug-in, input plug-in, signal plug-in, human-machine dialogue plug-in and communication plug-in, thereby reducing the number of devices and wiring complexity;

[0027] The communication plug-in of the present invention supports 10-way RS485 master station interface and 2-way fiber optic Ethernet interface, has a transmission rate of up to 115200bps, supports a transmission distance of up to 1000 meters, can achieve fast and stable data transmission, and meet the needs of real-time monitoring and remote control;

[0028] The present invention is equipped with a large-screen LCD display and a full Chinese menu through a human-machine dialogue plug-in, providing an intuitive operation interface, allowing users to quickly obtain device status and operation information, thereby improving the convenience and efficiency of operation;

[0029] Through the remote control module, the present invention allows users to remotely manage and automatically monitor the photovoltaic power generation unit or wind farm at the booster station, meeting the requirements of fully intelligent and "unmanned and less-manned" operation and management of photovoltaic power stations and wind farms;

[0030] The present invention can monitor the operating parameters of the power system in real time through various modes of protection function modules, issue fault alarms in time, and ensure the safe operation of the power system;

[0031] The present invention supports multiple protocols (such as IEC60870-5-101, IEC60870-5-104, Modbus, etc.), can be seamlessly connected with mainstream power station monitoring systems, and has good compatibility and scalability;

[0032] The present invention detects the grounding condition of the casing of the multifunctional intelligent box-type transformer monitoring device applied to the new energy power station through a newly constructed grounding safety detection module, and can accurately judge whether its grounding is good, thereby providing a strong guarantee for the safe and stable operation of the new energy power station. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of a specific embodiment of the chassis of the present invention;

[0034] Figure 2 It is a schematic diagram of a large-screen liquid crystal display screen of a specific embodiment of the chassis of the present invention;

[0035] Figure 3 It is a structural schematic diagram of another specific embodiment of the chassis of the present invention;

[0036] Figure 4 It is a mounting hole dimension diagram of a specific embodiment of the chassis of the present invention;

[0037] Figure 5 is a mounting hole dimension diagram of another specific embodiment of the chassis of the present invention;

[0038] Figure 6 It is an action logic diagram of a differential quick-break protection element in an electrical quantity protection functional unit of the present invention;

[0039] Figure 7 It is an action characteristic diagram of the ratio differential protection function in the electrical quantity protection function unit of the present invention;

[0040] Figure 8 It is an action logic diagram of a differential protection element in an electrical quantity protection functional unit of the present invention;

[0041] Fig. 9 It is an action logic diagram of a large differential current protection element in an electrical quantity protection functional unit of the present invention;

[0042] Fig.10 It is the action logic diagram of the overcurrent one stage, overcurrent two stage and overcurrent three stage protection functions in the electrical quantity protection function unit of the present invention;

[0043] Fig.11 It is an action logic diagram of the overload protection function in the electrical quantity protection function unit of the present invention;

[0044] Fig.12 It is the action logic diagram of the PT disconnection protection function in the electrical quantity protection function unit of the present invention;

[0045] Fig.13 It is an action logic diagram of the overvoltage protection function in the electrical quantity protection function unit of the present invention;

[0046] Fig.14It is an action logic diagram of the undervoltage protection function in the electrical quantity protection function unit of the present invention;

[0047] Fig.15 It is a logic diagram of the CT disconnection function in the electrical quantity protection function unit of the present invention;

[0048] Fig.16 It is a logic diagram of the single-phase grounding function action in the electrical quantity protection functional unit of the present invention;

[0049] Fig.17 It is a logic diagram of the zero-sequence current protection function in the electrical quantity protection function unit of the present invention;

[0050] Fig.18 It is an action logic diagram of a negative sequence current protection element in an electrical quantity protection functional unit of the present invention. DETAILED DESCRIPTION

[0051] In order to make the features and advantages of the present invention more obvious and easy to understand, the technical solution will be clearly and completely described below in combination with the drawings and specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0052] In recent years, my country's new energy industry has developed rapidly, especially solar energy and wind energy. With the strong support of national policies, it has entered a rapid development stage. In the process of development, related supporting facilities and technologies are particularly important. Take the monitoring of box transformers in wind farms as an example. With the rapid development of the wind power industry, the non-intelligence of 35kV box transformers has become the biggest obstacle to the automation process of wind farms. Various information in the box transformers cannot be uploaded to the central control room in real time, making the box transformers a monitoring blind spot for wind farms, which has brought great inconvenience to the safe production and daily maintenance of wind farms, especially hidden dangers to equipment and personal safety.

[0053] Therefore, the present application proposes a multifunctional intelligent box transformer monitoring device and system for new energy power stations, which is used for analog quantity collection, non-electrical quantity protection, remote control and communication functions of the box transformer. The booster station can realize remote management and automatic monitoring of photovoltaic box transformers or wind power box transformers, and meet the "unmanned and few-staffed" operation and management mode of photovoltaic power stations or wind farms. The device can collect various information of the transformer in real time, such as electrical quantity signals such as current and voltage of the box transformer, and can also collect non-electrical quantity signals such as oil level, oil temperature, heavy gas, etc. of the transformer. When an abnormal event occurs, the multifunctional intelligent box transformer monitoring device will upload the fault information in time through different communication media, send out an alarm signal or perform a tripping action to avoid further expansion of the fault, and save the direct loss of damage to the box transformer equipment and the indirect loss of power generation during maintenance. In addition, the operating personnel can monitor and control the box transformer remotely, thereby greatly reducing the workload of on-site maintenance and the resulting personal safety hazards.

[0054] At present, the communication of junction boxes, inverters, box transformers and other equipment in most photovoltaic power generation units is to send information to the communication management machine first, and then upload it to the integrated system through the optical fiber transceiver. This makes the wiring of the entire system too complicated, increasing the possibility of failure, and also increasing the investment cost of the enterprise, which is not conducive to the future troubleshooting of system failures. The multifunctional intelligent box transformer monitoring device integrates the communication management machine, optical fiber switch and perfect box transformer measurement and control protection functions on the basis of the traditional solution, and is responsible for collecting and transmitting data information of box transformers, junction boxes, inverters and other equipment; this not only simplifies the wiring of the entire photovoltaic power generation unit, improves the stability of the system, but also reduces the investment cost of photovoltaic power station measurement and control communication equipment.

[0055] Example 1

[0056] The multifunctional intelligent box-type transformer monitoring device for new energy power stations proposed in this application is code-named BHE-336F (G / T).

[0057] See Table 1 for a brief selection of BHE-336F (G / T) multifunctional intelligent box-type transformer monitoring device series products.

[0058] Table 1

[0059]

[0060] like Figure 1-5 As shown in the figure, the multifunctional intelligent box-type transformer monitoring device adopts a reinforced unit chassis, which is designed to resist strong vibration and strong interference; ensuring that the device still has high reliability when installed in harsh conditions. No AC or DC input anti-interference modules are required regardless of group or dispersed installation. The panel includes an LCD display, signal indicator light, operation keyboard, etc.

[0061] The multifunctional intelligent box-type transformer monitoring device is composed of the following plug-ins: communication plug-in, AC plug-in, CPU plug-in, input plug-in, signal plug-in and human-computer dialogue plug-in.

[0062] (1) Communication plug-in

[0063] The AC conversion part includes a current converter TA and a voltage converter TV, which are used to convert the secondary side current and voltage signals of the system TA and TV into weak current signals for conversion by the CPU plug-in and to isolate strong and weak currents.

[0064] (2) CPU plug-in

[0065] This plug-in integrates data sampling processing, communication and protection functions. The plug-in adopts multi-layer printed circuit board and surface mounting technology, and adopts a variety of anti-interference measures, which greatly improves the anti-interference performance.

[0066] (3) Open the plug-in

[0067] Each input plug-in can provide 24 inputs, and the working voltage is AC220V.

[0068] (4) Signal plug-in

[0069] This plug-in integrates the device's power module and 8-way programmable backup relay outputs.

[0070] (5) Human-computer dialogue plug-in

[0071] The human-computer dialogue plug-in is installed on the device panel, such as Figure 2 As shown, it uses a large-screen LCD display and a full Chinese menu display (operation). The main functions are: keyboard operation, LCD display, signal light indication, and the human-computer dialogue plug-in is the main component for the device to exchange information with the outside world.

[0072] (6) Communication plug-in

[0073] Provide 10 RS485 master station interfaces and 2 fiber optic Ethernet interfaces. 10 RS485 can be connected to intelligent devices such as inverters and combiner boxes. Each RS485 interface can connect 32 devices. The transmission rate is configurable from 300bps to 115200bps. The transmission distance can reach 1000 meters. It can support multiple protocols such as IEC60870-5-101, IEC60870-5-104, Modbus, CDT, 9702, and private protocols (the protocol text must be provided). 2 fiber optic Ethernet interfaces can form a self-healing fiber optic ring network. The fiber optic interface is single-mode or multi-mode SC type (optional ST, FC, etc.), with a wavelength of 1310nm and a transmission distance of up to 50km. The communication protocol adopts IEC60870-5-104, which is oriented to the data of a single intelligent device, and realizes the unified conversion and transmission from Modbus to IEC60870-5-104, which can be easily connected to the current mainstream power station monitoring system.

[0074] Example 2

[0075] Based on the above-mentioned multifunctional intelligent box transformer monitoring device for new energy power stations, the present application proposes a matching multifunctional intelligent box transformer monitoring system for new energy power stations, including an analog quantity acquisition module, a protection function module, a remote control module, a communication function module, and a temperature acquisition function module. The analog quantity acquisition module acquires electrical quantity signals in real time, the protection function module monitors various operating parameters and states of the power system in real time, the remote control module allows operating personnel to monitor and control the box transformer remotely, the communication function module uploads fault information in time through different communication media, and the temperature acquisition function module acquires 4-20MA information output by 6-way thermal resistors or temperature transmitters to monitor the temperatures at multiple locations in the box transformer.

[0076] The analog quantity acquisition module converts the system's current and voltage signals into weak current signals suitable for CPU plug-in processing through the AC plug-in, samples and processes data through the CPU plug-in, and collects electrical quantity signals on the low-voltage side of the transformer. The electrical quantity signals include three-phase current, three-phase voltage, frequency, power factor, active power and reactive power.

[0077] The protection function module includes a non-electrical quantity protection function unit, a device fault alarm function unit, a telemetering, telesignaling, remote control and remote pulse function unit, and an electrical quantity protection function unit.

[0078] (1) Non-electrical protection

[0079] This device is equipped with 10 non-electrical protections, which can be controlled by the soft pressure plate, i.e. the control word, and the output delay can be set. Tripping and alarming are optional. If the fault state persists after non-electrical tripping or alarming, the tripping signal or alarming signal will be maintained until the non-electrical fault state is removed. The tripping signal or alarming signal can be reset by pressing the reset key.

[0080] (2) Device failure alarm

[0081] If the hardware of the protection device fails (AD failure, etc.), the LCD of the device can display the fault information and drive the alarm relay of the device, while locking the protection. After the fault is handled and the power is turned on again, the alarm light can be reset.

[0082] (3) Telemetering, telesignaling, remote control and remote pulse functions

[0083] Telemetry: measuring box high and low voltage sides IA1, IB1, IC1, UA1, UB1, UC1, UAB1, UBC1, UCA1, P1, Q1, f1, COSφ1, IA2, IB2, IC2, UA2, UB2, UC2, UAB2, UBC2, UCA2, P2, Q2, f2, COSφ2, etc.;

[0084] Remote signal: various protection action signals and circuit breaker position remote signal, input remote signal, etc.;

[0085] Remote control: remote control of tripping / closing, pressure plate throwing and retracting, setting value modification, etc.

[0086] Remote pulse: remotely read the pulse output of the watt-hour meter and transmit the pulse signal of power consumption for remote measurement.

[0087] (4) Electrical quantity protection function

[0088] (4.1) Differential quick-break protection function

[0089] like Figure 6 As shown, ICSDset is the differential breaking value; INCD is the differential current of any phase; and the differential breaking action jumps to the high and low voltage sides.

[0090] (4.2) Ratio differential protection function

[0091] In order to ensure the sensitivity of differential protection during internal faults and prevent malfunction caused by transient unbalanced currents due to external faults and inconsistent CT characteristics, the device adopts the ratio differential principle of second harmonic braking. The action characteristics are as follows: Figure 7 As shown, the action criteria are:

[0092]

[0093] Figure 7 In the figure, Icd is the differential current; Izd is the braking current; ICDset is the differential protection action setting; IZDset is the braking current setting; K1 is the ratio braking coefficient setting (0.3~0.5, 0.5 is recommended).

[0094] The calculation method of differential current and braking current is:

[0095]

[0096] Recommended tuning principles:

[0097]

[0098] Among them: IH and IL are the secondary currents on the high and low sides of the transformer after phase correction, both of which are in the positive direction when flowing into the transformer, and the current transformers on both sides of the transformer have the same polarity when pointing to the busbar; S is the rated capacity of the transformer; UNH is the rated voltage on the high-voltage side of the transformer; IEH is the rated current on the high-voltage side of the transformer, and NCH is the CT ratio on the high-voltage side of the transformer.

[0099] The action logic diagram of the differential protection element is as follows: Figure 8 As shown, INCD is the differential current of any phase; INCD2 is the second harmonic current of the differential current of any phase. The differential action trips the high voltage side and the low voltage side. (K2 is the harmonic coefficient, and the recommended setting value is 0.15)

[0100] (4.3) Differential current overload protection function

[0101] The action logic diagram of the differential current overload protection element is as follows Fig. 9 As shown in the figure, ICLset is the current setting value of the differential current over-limit protection; TCLset is the limit value of the differential current over-limit protection; INCD is the differential current of any phase.

[0102] (4.4) Phase compensation and current balance adjustment

[0103] The CTs on both sides of the transformer are connected in star connection, which can simplify the wiring and improve reliability. The polarity of the CTs is the same as that pointing to the busbar.

[0104] The device is equipped with a phase adjustment control word. For transformers with Y / Δ-11 connection or Δ / Y-11 mode, the CTs on both sides adopt star connection and phase adjustment should be put into operation. The software will automatically correct the current on the high-voltage side. The adjustment method is as follows:

[0105] High Side:

[0106] Low Side:

[0107] Where: is the current of each phase after high-side correction; is the high-side CT secondary current; is the current after low-side correction; is the low-side CT secondary current; KL is the low-voltage side balance coefficient.

[0108] For the connection where the secondary connection of the high-voltage side CT is Δ-shaped and the secondary connection of the low-voltage side CT is Y-shaped, no phase correction is required and the phase adjustment should be exited.

[0109] Since the CT characteristics on both sides of the transformer are inconsistent, unbalanced current is easily generated. For this reason, the device is equipped with a balance coefficient compensation function. The compensation is based on the secondary current on the high-voltage side, and the current on the low-voltage side is multiplied by the balance coefficient. The coefficient is calculated as follows:

[0110]

[0111] Where, IEH and IEL are the primary rated currents on the high and low voltage sides, respectively; NCH and NCL are the CT transformation ratios on the high and low voltage sides, respectively.

[0112] The relevant calculations of differential current and braking current are all carried out on the basis of current phase correction and balance coefficient compensation.

[0113] (4.5) Overcurrent protection function: one stage, two stages and three stages

[0114] The action logic of overcurrent protection function is as follows: Fig.10 As shown in the figure, IGLset is the overcurrent one / two / three-stage protection current setting; U2set is the composite voltage negative sequence voltage setting; UDset is the composite voltage low voltage setting; TGLset is the limit value during overcurrent protection; IN is any phase protection current; ULN is any line voltage; U2 is the calculated negative sequence voltage, which can be calculated based on the three-phase phase voltage; ULN is any line voltage.

[0115] (4.6) Overload protection function

[0116] The overload protection function action logic is as follows Fig.11 As shown in the figure, IGFHse is the overload protection current setting value; TGFHset is the limit value when overload occurs; IN is the protection current of any phase; and an alarm signal is sent after overload action.

[0117] (4.7) PT disconnection protection function

[0118] The action logic of PT disconnection protection function is as follows: Fig.12 As shown, U1 is the calculated positive sequence voltage, U2 is the calculated negative sequence voltage, and IN is the protection current of any phase.

[0119] (4.8) Overvoltage protection function

[0120] The overvoltage protection function action logic is as follows Fig.13 As shown in the figure, UGYset is the overvoltage protection voltage setting value; TGYset is the overvoltage protection limit value; ULN is any line voltage

[0121] (4.9) Undervoltage protection function

[0122] The action logic of undervoltage protection function is as follows: Fig.14 As shown in the figure, UQYset is the undervoltage protection voltage setting value; ULN is any line voltage.

[0123] (4.10) CT disconnection function

[0124] CT disconnection function action logic is as follows Fig.15 shown.

[0125] (4.11) Single-phase grounding function

[0126] The single-phase grounding function action logic is as follows Fig.16 As shown in the figure, U0set is the zero-sequence voltage setting value of single-phase grounding protection; TU0set is the limit value when single-phase grounding occurs; U0 is the zero-sequence voltage, which is calculated based on the three-phase voltage on the low-voltage side. Note: Single-phase grounding protection is only suitable for the voltage three-phase four-wire wiring method. This protection function is invalid when the voltage wiring is three-phase three-wire.

[0127] (4.12) Zero-sequence current protection function

[0128] In a low-resistance grounding system, when the grounding zero-sequence current is relatively large, or when there are many cable outlets and the capacitive current is large, the zero-sequence overcurrent direct tripping method is generally used. The logic diagram of the zero-sequence current protection function is as follows: Fig.17 As shown in the figure, ILXset1 is the current setting value of zero-sequence one-stage current protection; TLXset is the time limit value of zero-sequence one-stage current protection; ILXset2 is the current setting value of zero-sequence two-stage current protection; TLXset2 is the time limit value of zero-sequence two-stage current protection, and I0 is the zero-sequence current value. Zero-sequence one-stage current protection is alarm, and zero-sequence two-stage current protection is tripped.

[0129] The zero-sequence current can be calculated based on the phase current on the high-voltage side or the low-voltage side according to parameter settings, or directly collected by adding a zero-sequence CT.

[0130] (4.13) Negative sequence current protection

[0131] Negative sequence current protection is mainly used for various non-grounding asymmetric faults, such as when a phase of the transformer is broken or unbalanced.

[0132] Negative sequence current:

[0133]

[0134] The action logic diagram of the negative sequence current protection element is as follows: Fig.18As shown in the figure, IFXset1 is the negative sequence first stage protection current setting value; IFXset2 is the negative sequence second stage protection current setting value; TFXset1 is the negative sequence first stage protection time limit value; TFXset2 is the negative sequence second stage protection time limit value; I2 is the calculated negative sequence current. Negative sequence first stage is alarm, and negative sequence second stage is trip.

[0135] The negative sequence current I2 is calculated based on the phase current on the high voltage side.

[0136] The remote control module provides a remote control user interface through a human-machine dialogue plug-in, provides RS485 and fiber optic Ethernet interfaces through a communication plug-in, and supports the reception and execution of remote control commands.

[0137] The communication function module integrates 10 RS485 master station interfaces and 2 fiber optic Ethernet interfaces through the communication plug-in, supports multiple communication protocols, and realizes the collection and transmission of data information; through the built-in communication management machine, it realizes the centralization and transmission of communication information of intelligent devices belonging to the photovoltaic power generation electronic system, provides photoelectric conversion function, and supports the establishment of self-healing fiber optic ring network.

[0138] In addition, in actual applications, due to the influence of external factors such as the vibration of the machine's cooling system, the grounding wire head will vibrate and loosen. In this case, the grounding safety of the product may have been seriously affected, but during the detection, the current usually only fluctuates, and the average current may not decrease. Therefore, the method of judging whether the chassis grounding is good or not based solely on the current size is not reliable.

[0139] Generally speaking, in low-voltage electrical equipment, the protective grounding resistance should be no greater than 4 ohms. In some places with high grounding requirements, such as electronic equipment rooms, the grounding resistance requirements may be more stringent, usually no greater than 1 ohm. For high-voltage systems, the grounding resistance requirements will be determined based on factors such as the system's voltage level, grounding method, and specific application environment. For example, in a small grounding current system of 10kV and below, the grounding resistance is usually no greater than 10 ohms; in a large grounding current system, the grounding resistance may be even smaller.

[0140] The newly developed grounding safety detection architecture is different from the spot check and regular inspection in the existing technology. It considers giving the grounding wire a constant power supply. At the same time, in order to save energy, we set the constant power supply to a tiny power supply of about 0.01-0.5v, which generates a weak current (the corresponding energy consumption is almost negligible); at the same time, the current point value (discrete data layer) at a fixed sampling frequency is obtained through the current sensor. , where the subscript corresponds to the sampling interval ∆t1, for example, sampling once per minute. Under such a technical route, since the current is relatively weak, a corresponding current data feature extraction and processing method is required, and this processing method is preferably adjustable to adapt to various environmental changes (such as the above-mentioned heat dissipation or other mechanical vibrations on grounding, etc.) for the requirements of robust characteristics of grounding detection.

[0141] Specifically speaking about the problem of feature extraction, for the micro-current point values ​​sampled in a constant micro-power environment, they are first fitted into a continuous function (continuous data layer) by interpolation method. , where the superscript corresponds to a larger interval ∆t2 that is artificially selected, such as fitting once a day.

[0142] right Perform Taylor series expansion to obtain the linear data layer ; Here, through the data processing method of series expansion, it is possible to easily extract the data features of the adjustable curve, and it has the adjustability required above; for example, if we can take the first three continuous functions for data testing, we can get the final desired test effect, then we can use the first three continuous functions for testing; if the first three continuous functions cannot achieve the final desired test effect, we will continue to increase the number of continuous functions, for example, take the first five continuous functions, the first seven continuous functions, and so on, until the final desired test effect of grounding safety detection is achieved.

[0143] Next, take the first k items of the linear data level to get n k-dimensional vectors , respectively , The subscript is the same as above The superscripts of correspond to each other; thus, the vector space data layer is obtained.

[0144] By analyzing the internal data structure characteristics of the vector space data layer, the grounding state variation warning is carried out. The specific calculation program is constructed as follows: . Among them, the numerator corresponds to the inner product of the vectors derived from different large intervals. It is easy to see mathematically that the size of the inner product corresponds to the consistency of the directions of the two vectors. For example, when the inner product is 1, it means that the directions of the two vectors are consistent, which means that the fitted continuous function curves are completely consistent, indicating that the current has no fluctuations and the grounding is normal; conversely, if the inner product is 0, it means that the two vectors are perpendicular, the current fluctuates greatly, and the grounding is abnormal. This gives a valuable hint, that is, by calculating the inner product of the vectors, a variation parameter of 0-1 can be obtained to detect the grounding condition of the casing of the multifunctional intelligent box transformer monitoring device used in new energy power stations. At the same time, the absolute value product of the length of the vector corresponding to the denominator is multiplied by the divisor, and the calculated variation parameter based on the vector consistency inner product is expressed as a percentage. For example, suppose is the value of the first large interval ∆t2, such as the value of the first day, at which time the equipment is considered to be in good condition. is the value of the nth day; after the data features are extracted and calculated through the above data program, a threshold is set (the threshold is of course adjustable, and in particular, it can be adjusted and optimized by post-feedback). For example, when the variation parameter is less than 60%, it is considered that a large variation has occurred. At this time, an early warning will be issued and maintenance will be recommended.

[0145] The present invention has the following characteristics:

[0146] (1) The reinforced unit chassis is designed to resist strong vibration and strong interference, and is particularly suitable for harsh environments and a wide temperature range of -40℃ to 70℃.

[0147] (2) The device's integrated circuits are all industrial products, which makes the device highly stable and reliable, and meets the requirements for closed-door operation of the photovoltaic field.

[0148] (3) The device collects three-phase current, three-phase voltage, frequency, power factor, active power and reactive power on each side of the two groups on the low-voltage side of the transformer for telemetry of the integrated automatic system.

[0149] (4) The setting of the device is based on the protection function of electrical quantities, including three-stage current protection with compound voltage lockout, zero-sequence current, overvoltage, undervoltage, CT disconnection, PT disconnection, etc.

[0150] (5) The BHE-336F (G / T) device is equipped with a maximum of 48 switch input functions, which can collect common switch signals such as load switch position, low-voltage circuit breaker position signal, low-voltage disconnector fuse group position signal, small circuit breaker position signal, fuse blowing signal, box transformer door switch signal, etc.; it can also realize non-electrical protection such as heavy gas action tripping, light gas action alarm, SF6 gas pressure abnormal alarm, transformer high temperature alarm, transformer ultra-high temperature tripping, transformer low oil level, etc., and provide 10 programmable standby non-electrical functions (tripping alarm is optional) to facilitate non-electrical expansion.

[0151] (6) All protection functions of the device are set with control words, which can be easily activated or deactivated by entering the password through the LCD.

[0152] (7) The device has three-way Pt100 resistance temperature and three-way DC (0-5V DC voltage or 4-20mA current) collection functions, which can be used to collect relevant temperatures of the box transformer, and set the temperature over-limit alarm function to facilitate the monitoring of the photovoltaic field integrated system.

[0153] (8) The device is equipped with 8 outputs to facilitate the expansion of the control function of the box-type transformer. It can realize remote control of opening and closing of switches with electric operation function.

[0154] (9) The device uses graphic LCD, full Chinese display, menu-based human-computer interaction, and can display various operating status and data in real time. The information is detailed and intuitive, and operation and debugging are convenient.

[0155] (10) Large-capacity information recording: It can save 32 recent historical reports, with action parameters and power-off retention.

[0156] (11) The device structure is designed according to the requirements of box-type transformer switch cabinet, with small size, simple installation and convenient wiring.

[0157] (12) The integration of communication management machine, optical fiber switch, and comprehensive measurement, control and protection functions can reduce the investment cost of measurement, control and communication equipment of photovoltaic power stations by two-thirds.

[0158] (13) It provides 4 Ethernet ports, 2 fiber-optic Ethernet ports and 10 RS485 interfaces, ensuring the reliability of communication over long distances and under harsh conditions. It has a rich built-in communication protocol library and good support for third-party system and equipment protocols. The communication protocol supports IEC60870-5-104, IEC61850 and Modbus, which can be easily connected to the power station monitoring system. It supports the specific communication service mapping (SCSM) of IEC61850-8-1, and can achieve seamless connection with the new intelligent booster substation system.

[0159] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0160] In each embodiment, the hardware implementation of the technology can directly adopt existing intelligent devices, including but not limited to industrial computers, PCs, smart phones, handheld stand-alone machines, floor-standing stand-alone machines, etc. Its input device preferably adopts a screen keyboard, its data storage and calculation module adopts existing memory, calculator, controller, its internal communication module adopts existing communication ports and protocols, and its remote communication adopts existing GPRS networks, World Wide Internet, etc. It can be clearly understood by technicians in the relevant field that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device is divided into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of each functional unit and module are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the above-mentioned method embodiment, and will not be repeated here. The functional units in the various embodiments of the present invention can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit. If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor.

[0161] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A multifunctional intelligent box-type transformer monitoring system for a new energy power station, which is a software execution system installed in a multifunctional intelligent box-type transformer monitoring device for a new energy power station. The multifunctional intelligent box-type transformer monitoring device includes a reinforced unit chassis, which is internally provided with an AC plug-in, a CPU plug-in, an input plug-in, a signal plug-in, a human-machine dialogue plug-in and a communication plug-in. The CPU plug-in adopts a multilayer printed circuit board and a surface mounting process; the communication plug-in includes a 10-way RS485 master station interface and a 2-way optical fiber Ethernet interface, and the 10-way RS485 access inverter and combiner box Intelligent device, each RS485 interface can access 32 devices, the transmission rate is 300bps-115200bps, the transmission distance is up to 1000 meters, and it supports IEC60870-5-101, IEC60870-5-104, Modbus, CDT, 9702, and private protocols. The enhanced unit chassis does not need to be equipped with AC and DC input anti-interference modules. The enhanced unit chassis panel includes a large-screen LCD display, signal indicator light, and operation keyboard, which can adapt to a wide temperature working environment of -40℃ to 70℃; It is characterized by: The multifunctional intelligent box-type transformer monitoring system includes an analog quantity acquisition module, a protection function module, a remote control module, a communication function module, and a temperature acquisition function module. The analog quantity acquisition module acquires electrical quantity signals in real time, the protection function module monitors various operating parameters and states of the power system in real time, the remote control module allows operators to monitor and control the box-type transformer remotely, the communication function module uploads fault information in time through different communication media, and the temperature acquisition function module acquires 4-20MA information output by 6-way thermal resistors or temperature transmitters to monitor the temperature at multiple locations in the box-type transformer; The multifunctional intelligent box-type transformer monitoring system also includes a grounding safety detection module, and the data structure of the grounding safety detection module includes: a discrete data layer; a continuous data layer; a linear data layer; a vector data layer; a grounding current variation characterization data layer; The data processing process of the grounding safety detection module is as follows: a. Power supply: set a constant micro power supply to provide weak current; b. Data acquisition: The current data points are acquired by the current sensor at a fixed sampling frequency to form discrete data layers I0, I1, I2, I3...In, where the subscript corresponds to the sampling interval ∆t1; c. Data interpolation: Interpolate the discrete data layer and fit it to the continuous function I(t) to form a continuous data layer I1=I1(t), I2=I2(t), I3=I3(t)......In=In(t), where the superscript corresponds to the larger interval ∆t2 selected artificially; d. Series expansion: Perform Taylor series expansion on the continuous function I(t) to obtain the linear data layer a1t1+a2t2+a3t3+......; e. Vector data layer: Extract the first k items from the linear data layer and generate n k-dimensional vectors [a11, a12, a13, a14...a1k], [a21, a22, a23, a24...a2k], ..., [an1, an2, an3, an4...ank], which are respectively denoted as , The subscript of corresponds to the superscript of In(t) above; f. Vector analysis: Based on the analysis of vector data, the variation characteristics of the grounding current are characterized by data to obtain the grounding current variation characterization data; the specific algorithm process is: through the direction, length or composite data relationship of the direction and length of the k-dimensional vector in different ∆t2 intervals, the variability of the grounding current in two or more corresponding ∆t2 intervals is numerically characterized; finally, the obtained data representation is compared with the pre-set fixed threshold or feedback adjustable threshold, and based on the data comparison results, it is determined whether the variation degree of the grounding current meets the warning or maintenance standards.

2. A multifunctional intelligent box-type transformer monitoring system for a new energy power station according to claim 1, characterized in that: The AC plug-in includes a current converter TA and a voltage converter TV, which are used to convert the secondary side current and voltage signals of the system TA and TV into weak current signals for conversion by the CPU plug-in; the CPU plug-in includes data sampling processing, communication and protection components; the input plug-in provides 24 inputs, and the working voltage is AC220V / DC220 / 110V; the signal plug-in includes the power supply element of the device and 8 programmable standby relay outlets; the human-machine dialogue plug-in is installed on the panel of the multifunctional intelligent box-type transformer monitoring device, and the human-machine dialogue plug-in adopts a large-screen LCD display, and a full Chinese menu mode for display and operation, including keyboard operation, LCD display , signal light indication; the 2-way fiber optic Ethernet interface of the communication plug-in forms a self-healing fiber optic ring network, the fiber optic Ethernet interface is single-mode or multi-mode SC / ST / FC type, the wavelength is 1310nm, the transmission distance is 50km, the communication protocol adopts IEC60870-5-104, for a single smart device data, to achieve a variety of protocols to IEC60870-5-104 unified conversion and transmission, access to the mainstream power station monitoring system; the smart device includes inverter, combiner box; the multiple protocols include IEC60870-5-101, IEC60870-5-104, Modbus, CDT, 9702, private protocol.

3. A multifunctional intelligent box-type transformer monitoring system for a new energy power station according to claim 1, characterized in that: The analog quantity acquisition module converts the current and voltage signals of the system into weak current signals suitable for CPU plug-in processing through the AC plug-in, samples and processes data through the CPU plug-in, and collects electrical quantity signals on the low-voltage side of the transformer. The electrical quantity signals include three-phase current, three-phase voltage, frequency, power factor, active power and reactive power.

4. A multifunctional intelligent box-type transformer monitoring system for a new energy power station according to claim 1, characterized in that: The protection function module includes a non-electrical quantity protection function unit, a device fault alarm function unit, a telemetering, telesignaling, remote control and remote pulse function unit, and an electrical quantity protection function unit; the non-electrical quantity protection function unit is provided with 10 non-electrical quantity protections, which are controlled by a soft pressure plate, and the output delay is set to select tripping or alarming. After the non-electrical quantity tripping or alarming, the fault state persists, and the tripping signal or alarm signal will be maintained until the non-electrical quantity fault state is removed, and then the reset key is pressed to reset the tripping signal or alarm signal; the device fault alarm function unit includes that when the hardware of the multifunctional intelligent box transformer monitoring device fails, the large-screen LCD screen displays the corresponding fault information, drives the device alarm relay, and locks the protection. After the fault is handled and the power is turned on again, the alarm light can be reset; The telemetering, telesignaling, remote control and remote pulse function units include remote monitoring of the operating parameters of electrical equipment, remote reception and display of the signal status of the equipment, remote control of the operation of electrical equipment, and remote transmission of pulse signals; the electrical quantity protection function unit includes differential quick-break protection function, ratio differential protection function, differential current overload protection function, overcurrent one stage, overcurrent two stage, overcurrent three stage protection function, overload protection function, PT line break protection function, overvoltage protection function, undervoltage protection function, CT line break function, single-phase grounding function, zero-sequence current protection function, and negative-sequence current protection.

5. A multifunctional intelligent box-type transformer monitoring system for a new energy power station according to claim 4, characterized in that: The telemetry includes measuring the box variable high, the first group of current A phase IA1 on the low voltage side, the first group of current B phase IB1, the first group of current C phase IC1, the first group of voltage A phase UA1, the first group of voltage B phase UB1, the first group of voltage C phase UC1, the first group of voltage AB phase UAB1, the first group of voltage BC phase UBC1, the first group of voltage CA phase UCA1, the first group of active power P1, the first group of reactive power Q1, the first group of frequency f1, the first group of power factor COSφ1, the second group of current A phase IA2, the second group of current B phase IB2, the second group of current C phase IC2, the first group of The second group of voltages are A phase UA2, the second group of voltages are B phase UB2, the second group of voltages are C phase UC2, the second group of voltages between AB phases UAB2, the second group of voltages between BC phases UBC2, the second group of voltages between CA phases UCA2, the second group of active power P2, the second group of reactive power Q2, the second group of frequencies f2, and the second group of power factors COSφ2; the telesignals include various protection action signals and circuit breaker position telesignals and opening telesignals; the remote controls include remote control of tripping / closing, pressure plate insertion and withdrawal, and modification of set values; the telepulses include remote reading of the pulse output of the watt-hour meter and the pulse signal for transmitting the electric energy consumption.

6. A multifunctional intelligent box-type transformer monitoring system for a new energy power station according to claim 1, characterized in that: The remote control module provides a remote control user interface through a human-machine dialogue plug-in, provides RS485 and optical fiber Ethernet interfaces through a communication plug-in, and supports the reception and execution of remote control commands.

7. The multifunctional intelligent box-type transformer monitoring system for a new energy power station according to claim 1 is characterized in that: The communication function module integrates 10 RS485 master station interfaces and 2 fiber optic Ethernet interfaces through a communication plug-in, supports multiple communication protocols, and realizes the collection and transmission of data information; through a built-in communication management machine, it realizes the centralization and transmission of communication information of intelligent devices belonging to the photovoltaic power generation electronic system, provides photoelectric conversion function, and supports the establishment of a self-healing fiber optic ring network.

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