Photovoltaic air conditioning system and charging control method thereof

Abstract

The invention discloses a photovoltaic air conditioning system. The photovoltaic air conditioning system comprises a photovoltaic battery, a direct current air conditioner, an energy storing apparatus and a photovoltaic converter. The photovoltaic converter comprises a photovoltaic charging circuit, a DC/DC switching circuit and a controller. The photovoltaic charging circuit transmits electricity output by the photovoltaic battery to a low voltage direct current bus; a DC/DC converter converts the electricity on the low voltage direct current bus into an electric signal required by working of the direct current air conditioner; when the controller meets a charging condition and the direct current air conditioner is in a non-running state, the photovoltaic charging circuit is controlled in a four-phase charging mode; and in the first charging phase, the controller gradually increases the duty cycle of a control signal of the photovoltaic charging circuit from the permissible minimum to the permissible maximum. The photovoltaic air conditioning system can charge the energy storing apparatus reasonably, so as to guarantee the service life of the energy storing apparatus. The invention also discloses a charging control method of the photovoltaic air conditioning system.

Description

technical field [0001] The invention belongs to the technical field of air conditioning, and in particular relates to a photovoltaic air conditioning system and a charging control method thereof. Background technique [0002] Photovoltaic air conditioners provide great convenience for some situations that are not convenient for grid power supply. For example, for large trucks, when parking and unloading in summer or resting on the vehicle at night, the temperature in the cab is often high and the environment is uncomfortable. Therefore, people have proposed the method of installing a photovoltaic auxiliary air conditioner for trucks, which uses photovoltaic cells to generate electricity to charge the vehicle battery, and then when parking for unloading or parking at night, the electric energy in the battery is released to supply power for the photovoltaic auxiliary air conditioner, thus solving the problem. above question. However, at present, the charging control strategy ...

AI Technical Summary

Problems solved by technology

However, a system similar to UPS that is powered by the grid stably is not suitable for photovoltaic vehicle-mounted auxiliary air-conditioning systems whose output power varies with light and whose power peak point is uncertain

Drawing lessons from the charging strategy of UPS, the peak power output capability of photovoltaic cells cannot be utilized, and once the light rapidly weakens, the on-board auxiliary air-conditioning system cannot meet the conditions of constant current or constant voltage charging for the battery of the vehicle, and the control is also difficult to achieve

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