Device for remote management and automatic monitoring of photovoltaic power station

Abstract

The utility model provides a device for remote management and automatic monitoring of a photovoltaic power station. The device comprises a mainboard arranged on a front plate of the device, and a communication module, a direct current measurement and control module, an alternating current measurement and control module, an input module and an output module which are arranged on a rear plate of the device, the direct-current measurement and control module is provided with a current sensor for collecting direct-current information; the AC measurement and control module is provided with a voltage and current transformer for acquiring AC voltage and current information; the input module is provided with a temperature sensor for collecting temperature information, a pressure sensor for collecting pressure information and a gas sensor for collecting gas concentration information; the output module is electrically connected with the gas tripping switch; the mainboard compares the collected information with the numerical range of normal operation of various types of information, and controls the output module to trip protectively when the collected information exceeds the range. The beneficial effects of the utility model lie in that the remote management and automatic monitoring of the booster station on the photovoltaic power station are realized, and the operation management mode of the photovoltaic power station or the wind power station that no person is on duty and few persons are on duty is satisfied.

Description

Technical Field

[0001] The utility model relates to the field of photovoltaic power stations, and in particular to a device for remote management and automatic monitoring of photovoltaic power stations. Background Art

[0002] With the rapid development of modern industry and the gradual improvement of people's living standards, the quality of electric energy and the reliability of power systems are becoming more and more important to customers. As a new energy source with the advantages of cleanliness, environmental protection and sustainability, solar energy is gaining more and more attention. This has led to the rapid development of the photovoltaic industry, especially bringing many opportunities to photovoltaic-related manufacturers.

[0003] If my country wants to vigorously develop photovoltaic power generation, it must improve the operation and management level of power generation network. When the photovoltaic power generation network operates normally, it must have functions such as measurement, safety protection, control, and remote communication to detect the operating status of the distribution system, judge the status and make necessary control instructions, and transmit all information to the monitoring system in a timely manner. Therefore, there is a requirement for photovoltaic control terminal.

[0004] Traditional photovoltaic power station monitoring products have low integration and multiple equipment configurations. They need to obtain information from various graphs and tables manually through operator stations, which is inefficient and has high construction, operation and maintenance costs. At the same time, existing products have problems such as inaccurate measurement data, easy interference with communication actions, and poor scalability, which threaten the reliability of control. Utility Model Content

[0005] The utility model solves the problem that the booster station cannot remotely manage and automatically monitor the photovoltaic power station and cannot meet the "unmanned and undermanned" operation and management mode of the photovoltaic power station or wind farm.

[0006] The utility model provides a device for remote management and automatic monitoring of a photovoltaic power station, comprising a mainboard arranged on a front panel of the device, and also comprising a communication module, a DC measurement and control module, an AC measurement and control module, an input module and an output module arranged on a rear panel and electrically connected to the mainboard respectively;

[0007] The DC measurement and control module is provided with a current sensor to collect DC current information and transmit the DC current information to the main board;

[0008] The AC measurement and control module is provided with a voltage and current transformer to collect AC voltage and current information, and transmit the AC current information to the main board;

[0009] The input module is provided with a temperature sensor to collect temperature information, a pressure sensor to collect pressure information, and a gas sensor to collect gas concentration information, and transmits the collected information to the main board;

[0010] The output module is electrically connected to the gas trip switch; the main board compares the collected information with the numerical range of normal operation of various types of information, and controls the output module to protectively trip when the range is exceeded.

[0011] As a preferred solution, the DC side capacitor communication module uses RS232 and multi-channel RS485 serial communication interface standards to transmit data with the mainboard.

[0012] As a preferred solution, the RS485 interface adopts word isolation and integrated magnetic isolation circuit, and adopts a magnetic isolation chip.

[0013] As a preferred solution, the mainboard is externally connected to a storage chip and a bus driver for improving the load capacity.

[0014] As a preferred solution, a 1 nF anti-transient capacitor is provided at the output end of the voltage transformer to reduce noise signals.

[0015] As a preferred solution, an integrated circuit for amplifying current to increase driving capability is provided in the output module, and an electrical isolation optical coupler is provided.

[0016] The beneficial effects of the utility model are:

[0017] 1. The utility model is suitable for scenes such as photovoltaic power stations and wind farms. It is used for analog quantity acquisition, electrical quantity protection, non-electric quantity protection, remote control and communication functions of photovoltaic power stations. It realizes remote management and automatic monitoring of photovoltaic power stations by booster stations, and meets the "unmanned and few-staffed" operation and management mode of photovoltaic power stations or wind farms.

[0018] 2. The utility model solves the problem that the old optical coupler isolation circuit is not suitable for application in today's increasingly stringent high-speed digital communication systems because it occupies too much space and volume, requires discrete components, cache drivers and circuit design is complicated. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to specific embodiments and in conjunction with the accompanying drawings.

[0020] Figure 1 A schematic structural diagram of the utility model.

[0021] Figure 2 A structural schematic diagram of a rear plate of the utility model.

[0022] Figure 3 The working flow chart of the mainboard of the utility model.

[0023] The reference numerals in the accompanying drawings are:

[0024] 1. Front panel, 2. Input module, 3. Output module, 4. DC measurement module, 5. AC measurement module, 6. Communication module. DETAILED DESCRIPTION

[0025] To illustrate the features of the present invention, the present invention is further described below with reference to the accompanying drawings and embodiments.

[0026] Embodiment 1:

[0027] See also Figures 1 to 3 The embodiment of the utility model provides a device for remote management and automatic monitoring of photovoltaic power stations, including a main board arranged on the front panel 1 of the device, and also including a communication module 6, a DC measurement and control module 4, an AC measurement and control module 5, an input module 2 and an output module 3 arranged on the rear panel and electrically connected to the main board respectively; thereby realizing the protection function, communication function, and measurement and control function, and at the same time, additional empty panels can also realize the expansion of input and output and measurement and control functions.

[0028] The DC measurement and control module 4 is provided with a current sensor to collect DC current information and transmit the DC current information to the main board;

[0029] The AC measurement and control module 5 is provided with a voltage and current transformer to collect AC voltage and current information, and transmit the AC current information to the main board;

[0030] The input module 2 is provided with a temperature sensor to collect temperature information, a pressure sensor to collect pressure information, and a gas sensor to collect gas concentration information, and transmits the collected information to the main board;

[0031] The output module 3 is electrically connected to the gas trip switch; the main board compares the collected information with the numerical range of normal operation of various types of information, and controls the output module 3 to protectively trip when the range is exceeded.

[0032] The communication module 6 uses RS232 and multi-channel RS485 serial communication interface standards to transmit data with the mainboard, supports Modbus or other protocols for the lower side, supports IEC101, IEC103, IEC104 for the upper communication protocol, and can perform various protocol conversions. The AT91SAM9260 used in the communication module is based on the ARM926EJ-S processor, with 8KB instruction and 8KB data cache. The performance can reach 210 MIPS when running at a clock frequency of 190 MHz. It includes 8KB SRAM and 32KB ROM, and can achieve single-cycle access at the highest processor or bus speed.

[0033] In most cases, due to the harsh application environment, an isolation solution is required for the RS-485 interface to prevent ground loops. There are many isolation solutions for the RS-485 interface. The old optocoupler isolation circuit is no longer suitable for today's increasingly stringent high-speed digital communication systems because it takes up too much space and volume, requires discrete components, cache drivers and circuit design is cumbersome. Therefore, the RS485 interface uses the iCoupler magnetic isolation solution, which can provide a variety of flexible isolation solutions such as multi-channel digital isolation, digital isolation with integrated RS-485 transceivers, and digital isolation with integrated isoPower magnetic isolation power supply. It provides solutions that are superior to optocouplers in terms of volume, power consumption, speed and many other aspects.

[0034] The main control chip uses RS-485 communication, and the isolation solution uses the ADM2587E magnetic isolation chip. At the same time, RS232 communication is realized through the MAX3232 transmitter. Data is transmitted through Ethernet control chips such as 88E6060, DM9000AE, and KSZ8041. The SST25VF016B storage chip is connected, and the 74HC245 bus driver is added to improve the load capacity.

[0035] The DC measurement and control module 4 can realize the acquisition of temperature and 5-30mA DC current. It uses the STM32F103VCT6 main control chip and connects the ADM3485EAR transceiver to realize RS-485 communication. The ADS7822U analog-to-digital converter is used to realize data conversion. At the same time, the HCPL0601 optical coupler isolation is designed, and the reference circuit is designed through the TL431AID. Using EMI capacitors, 1nF anti-transient capacitors are added at the output end of each transformer to reduce the noise signal in the circuit and improve the measurement accuracy and stability.

[0036] The AC measurement and control module 5 realizes the measurement and control of AC voltage and current. The voltage and current transformer converts the high voltage on the primary side into a rated voltage suitable for use by an instrument or relay. The current transformer converts the large current on the primary side into a rated current suitable for use by an instrument or relay.

[0037] Module 3 is used to realize the remote closing and opening of the line, and can perform protection tripping. The module is designed with a ULN2003AN integrated circuit to amplify the current and increase the driving capability, and uses a PC84X1J1000F electrical isolation optocoupler to achieve isolation.

[0038] The input module 2 includes detection of heavy gas, light gas, over-temperature, high temperature, low oil level, abnormal pressure, etc. For example, the heavy gas tripping protection pressure plate and control word are put into operation. When the gas tripping contact is closed, it will trip after the set time Tzws.

[0039] The above embodiments and drawings are only used to illustrate the technical solution of the utility model, and are not intended to limit the utility model. The utility model is described in detail with reference to the preferred embodiments. It should be understood by ordinary technicians in this field that the changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the utility model do not deviate from the purpose of the utility model and should also fall within the scope of protection of the claims of the utility model. Other related technical structures not fully disclosed in the utility model are prior art in the field.

Claims

1. A device for remote management and automatic monitoring of photovoltaic power stations, characterized in that: It comprises a main board arranged on a front board (1) of the device, and also comprises a communication module (6), a DC measurement and control module (4), an AC measurement and control module (5), an input module (2) and an output module (3) which are arranged on a rear board and are electrically connected to the main board respectively; The DC measurement and control module (4) is provided with a current sensor to collect DC current information and transmit the DC current information to the main board; The AC measurement and control module (5) is provided with a voltage and current transformer to collect AC voltage and current information, and transmit the AC current information to the main board; The input module (2) is provided with a temperature sensor to collect temperature information, a pressure sensor to collect pressure information, and a gas sensor to collect gas concentration information, and transmits the collected information to the main board; The output module (3) is electrically connected to the gas trip switch; the main board compares the collected information with the numerical range of normal operation of various types of information, and controls the output module (3) to protectively trip when the range is exceeded.

2. The device for remote management and automatic monitoring of a photovoltaic power station according to claim 1, characterized in that: The communication module (6) uses RS232 and multi-channel RS485 serial communication interface standards to perform data transmission with the main board.

3. The device for remote management and automatic monitoring of a photovoltaic power station according to claim 2, characterized in that: The RS485 interface adopts word isolation and integrated magnetic isolation circuit, and adopts magnetic isolation chip.

4. The device for remote management and automatic monitoring of a photovoltaic power station according to claim 2, characterized in that: The mainboard is externally connected to a storage chip and a bus driver for improving the load capacity.

5. The device for remote management and automatic monitoring of a photovoltaic power station according to claim 4, characterized in that: The output end of the voltage and current transformer is provided with a 1nF anti-transient capacitor for reducing noise signals.

6. The device for remote management and automatic monitoring of a photovoltaic power station according to claim 1, characterized in that: The output module is provided with an integrated circuit for amplifying current and increasing driving capability, and an electrical isolation optical coupler.

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