Soil moisture content monitoring system energy supply based on wind-solar complementation

Abstract

The invention discloses an energy supply system used for soil moisture content sensors, solves the problem that a traditional energy supply system used for the soil moisture content sensors is difficult to charge, short in battery cycle service life and low in safety, and relates to a power supply system. The system supplies energy by using the wind-solar complementation characteristic, and two-stage energy storage is formed by adopting a supercapacitor and a lithium battery. When a direct-current bus outputs voltage, the voltage output of the direct-current bus is selected as input voltage, and simultaneously the supercapacitor is charged; when the direct-current bus does not output voltage, the output of the supercapacitor is selected as input voltage; and when the direct-current bus and the supercapacitor are free of output respectively and the charge state of the lithium battery is greater than or equal to 20%, the output of the lithium battery is selected as input voltage. The power supply system guarantees the safety and reliability of the charging control circuit and the discharging control circuit by estimating SOC and SOH. The system preferably solves the problem that the energy supply system used for the soil moisture content sensors is difficult to charge, short in battery cycle service life and low in safety.

Description

technical field [0001] The present invention relates to the field of soil moisture sensors, and more specifically, relates to a power supply system that uses solar energy and wind energy as energy sources, uses supercapacitors as pre-stage energy storage, and combines lithium batteries as backup energy supply. Background technique [0002] In the field of soil moisture sensors, most of the soil moisture sensors widely used in the market are probe-based. This type of sensor can only measure soil surface moisture, and the probe needs to be in direct contact with the soil, requiring manual assistance for measurement. With the improvement of automation level and wireless network communication, and the difficulty of energy supply in remote agricultural areas, surrounding the low power consumption of the soil moisture sensor system, the convenience of energy sources, durability and stability, the soil moisture sensor system The development of the technology is also more and more i...

AI Technical Summary

Problems solved by technology

[0003] Smart tube soil moisture sensor devices are generally used in remote agricultural areas, where the area is wide, and it is very difficult to directly supply power to the soil moisture sensor system with mains power, and the laying of power supply lines is difficult, and it consumes manpower and material resources

When battery power is used, due to the limitation of battery storage energy, it is necessary to periodically remove and charge the battery or replace the battery by manpower, which greatly increases the maintenance cost of the system, and it is more difficult for a wide area that requires a large number of soil moisture sensor systems.

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