The power demand in Japan yearly increases especially in summer, and becomes peak in the daytime. The main cause is the drastically increased load of air conditioners widely used in general homes. The load pattern of air conditioners is very similar to the output pattern of a photovoltaic (PV) array.
Therefore, Sanyo has been developing two types of residential solar-powered air conditioner. One is a uni-directional system by using a DC/DC converter, which controls the voltage of a PV array at its optimal operation point and boosts the voltage up to the DC voltage of an inverter-type air conditioner. The other is a bi-directional system by using a bi-directional current-control converter, which regenerates surplus power into commercial system from a PV array, and suppresses the input current distortion of an air conditioner.
In this paper, the configurations and experimental results are described and discussed.
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