Controlling method enabling solar photovoltaic air conditioning system to independently operate

Abstract

The invention discloses a controlling method enabling a solar photovoltaic air conditioning system to independently operate. The technical problem that solar batteries in a current solar photovoltaicair conditioning system cannot be used individually to achieve independent operation can be solved. The method comprises the following steps: S100, directly switching solar photovoltaic power into a direct current circuit obtained by performing rectifying filter on original alternating current of a direct-current frequency-conversion air conditioner, wherein direct current bus voltage of the system is photovoltaic array output end voltage; S200, embedding a photovoltaic maximum power point tracking program into a variable frequency program of an air conditioner frequency converter module; andS300, adopting the photovoltaic maximum power point tracking program to adjust output power of a compressor by adopting a disturbance hill-climbing method or CVT (Continuously Variable Transmission) feedback type method so as to adapt instability of photovoltaic input. The controlling method disclosed by the invention has the advantages that power is generated individually by the solar batteries to achieve normal operation of the air conditioner under the conditions of no commercial power or no energy storage in the daytime, the air conditioner can continuously work under the situation that the photovoltaic input energy reaches 10 percent of the rated power of the air conditioner, and the operation effect of the air conditioner is in positive proportion to illumination; and meanwhile, theoriginal alternating current input part and the rectification part are kept, so that standby demands of regular power outage areas can be met.

Description

technical field [0001] The invention relates to the technical field of new energy, in particular to a control method for independently operating a solar photovoltaic air-conditioning system. Background technique [0002] Solar photovoltaic air conditioners currently on the market cannot use solar cells alone to operate independently. For example, Gree’s utility-assisted photovoltaic air conditioners and Midea’s energy storage photovoltaic air conditioners require the use of energy storage devices such as batteries to provide power or support with solar panels. Or the utility power provides auxiliary power and solar cells provide power, which is difficult to truly meet the demand for air conditioning in areas without electricity or in the mobile environment of ships. The cost of energy storage equipment is very high, the charge and discharge loss exceeds 30%, the efficiency is low, and the failure rate High, resulting in high cost of the entire system and low stability, see F...

AI Technical Summary

Problems solved by technology

[0003] A control method for independent operation of solar photovoltaic air-conditioning systems proposed by the present invention can solve the technical problem that solar photovoltaic air-conditioners on the market cannot use solar cells alone to operate independently

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