Off-network photovoltaic air-conditioning system and power supply control method thereof

Abstract

The invention provides a power supply control method for an off-network photovoltaic air-conditioning system. The off-network photovoltaic air-conditioning system comprises a photovoltaic array, a storage battery group and an air conditioner. The power supply control method comprises the following steps: judging working statuses of the photovoltaic array and the air conditioner; when the photovoltaic array is at a power supply state and the air conditioner is started, acquiring the output power of the photovoltaic array; judging whether the output power is matched with a required power for normal operation of the air conditioner; if the output power is not matched with the required power, controlling the photovoltaic array and the storage battery group to supply power to the air conditioner in parallel. According to the power supply control method for the off-network photovoltaic air-conditioning system, the utilization rate of the photovoltaic array can be increased; enough power can be supplied to the air conditioner under the condition of non-ideal illumination, further, the power level of the air conditioner cannot be reduced, and the air conditioner can be maintained to normally operate. The invention also provides the off-network photovoltaic air-conditioning system.

Description

technical field [0001] The invention relates to the technical field of electrical appliances, in particular to an off-grid photovoltaic air-conditioning system and a power supply control method for the off-grid photovoltaic air-conditioning system. Background technique [0002] In remote areas without power grids or isolated islands far from the coast, if household appliances such as air conditioners are used, photovoltaic air conditioning systems with batteries are often used. During the day, the photovoltaic array generates power to supply the household air conditioner. When the air conditioner is not working, the electric energy generated by the photovoltaic array is stored in the battery for use at night or in rainy days. [0003] However, in practical applications, due to cost constraints, the capacity of the storage battery is generally not too large, or even basically less than the power capacity required by the air conditioner for normal operation. Therefore, when t...

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Problems solved by technology

[0003] However, in practical applications, due to cost constraints, the capacity of the battery is generally not too large, or even basically less than the power capacity required for the normal operation of the air conditioner

Therefore, when battery power is used alone, the air conditioner can only run at a lower power level.

Moreover, in related schemes, once the output power of the photovoltaic array becomes too small to support the operation requirements of the air conditioner, the output of the photovoltaic array will be cut off and the battery will be used for power supply. The power supply of the battery alone will easily cause the air conditioner to operate at a lower power level.

In fact, at this time, the photovoltaic array is still in a state of power generation, but it has not been well utilized, which reduces the utilization rate of the photovoltaic array, especially in cloudy weather with strong light changes, and the photovoltaic power generation system is frequently switched on and off. , poor stability

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