Power Factor Issues with on Grid PV Solar Systems


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I have installed a 10KW SOLAR PV SYSTEM connected to grid supply. Before this the pf in each phase was 0.87-0.92 lag. I have not installed any pf correction system. After connecting to PV system, the pf in all three phases is some times leading and its so most of the time. this is resulting in average pf of 0.65-0.70 lag on the electricity supply company meter. I have to pay pf surcharge for the electricity imported from them (i have net metering system which would show energy imported, exported and net). How do i improve upon this?