A study on photovoltaic power system based on instantaneous real and imaginary power control

Most of the photovoltaic power generation systems linked to distribution lines are usually considered without relation to the operation of a power system. It is due to the output power ratio to the power system capacity. At the end of a distribution line, the phase balance is not always insured. Then, it is important to link the single phase system directly to the distribution lines keeping the system toward a balanced situation, even if the capacity is low. In order to reduce the imbalance of distribution source, this paper proposes a control method for a photovoltaic system which is linked to the distribution line, based on instantaneous real and imaginary power theory. The strategy of control method is given and the efficiency is numerically discussed.