The measurement and control network composed of RS485 bus mode is a common point-to-multipoint master control structure.
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In actual engineering projects, wireless networking has to be considered when wiring is difficult.
The so-called wireless 485 network is to replace the RS485 twisted pair with a wireless data terminal, and each device is equipped with a wireless 485 terminal DTD433M.
So far, a wireless 485 measurement and control network with a master-slave topology has been built.
The host is installed in the main control room, and the DTD433M is connected to the serial port of the computer, touch screen or PLC, thus completing the construction of the main control device.
The slave device has a switch input DI and output DO, an analog input AI and an output AO, which can be connected to various field measurement and control components.
There may be various transmitters such as temperature, pressure, flow, liquid level, etc., which can be uniformly represented by the input signal AI of 4~20mA.
The on-site smart meter, DCS acquisition terminal, and PLC analog input unit can all be represented by the 4~20mA output signal AO.
The button switch, start button, control terminal, alarm switch, etc. of the site can be uniformly represented by the switch input signal DI.
On-site relays, solenoid valves, pumps, motors, inverters, soft starters, etc., can be uniformly represented by the switch output signal DO.
In the system design and engineering implementation, it is only necessary to select the DTD433F analog slave or the DTD433H switch slave according to the site conditions.
The wireless measurement and control system designed with this master-slave network structure is simple and rapid in engineering construction, and the network coverage ranges from several hundred meters to several kilometers.
Three key devices in the system: DTD433M wireless master terminal, DTD433H wireless switch IO slave, DTD433F wireless analog terminal
A hybrid inverter is an inverter that combines the functions of an inverter and a charge controller. Its main function is to simultaneously process the direct current generated by solar panels and the electric energy of the battery energy storage system in a photovoltaic power generation system. It converts the direct current generated by the solar panels into alternating current for power and stores the excess power in the battery so that it can continue to supply power when needed.
Main effect:
Solar power generation: Hybrid inverters convert the direct current generated by solar panels into alternating current for home, commercial, or industrial electricity needs.
Battery energy storage: The hybrid inverter is equipped with a battery energy storage system that can store excess solar power. When the Solar Panel cannot generate enough electricity, the electricity stored in the battery can continue to supply electricity to achieve a continuous power supply.
Grid-connected function: Some hybrid inverters also have grid-connected functions, that is, the excess electric energy is integrated into the grid for use by other users. This allows them to interact with the grid, be self-sufficient, and export electricity to the grid.
Differences from other inverters:
Charging control function: The hybrid inverter combines the functions of an inverter and a charge controller, and can simultaneously process the DC power of the solar panel and the DC power of the battery energy storage system, realizing the hybrid application of solar power generation and battery energy storage.
Standalone operation: Unlike microinverters, hybrid inverters can operate independently and do not require an inverter for each solar panel, so it may be more economical and convenient when the system is larger.
Applicable scenarios: Hybrid inverters are widely used in home, commercial, and industrial photovoltaic power generation systems, especially in hybrid application scenarios that require photovoltaic power generation and battery energy storage.
In general, the main function of the hybrid inverter is to convert the direct current of the solar panel and the battery energy storage system into alternating current, so as to realize the hybrid application of photovoltaic power generation and battery energy storage. Compared with other inverters, it has higher flexibility and reliability in energy management and power supply stability.
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