Evaluation on reduction of output suppression loss by cooperative control of voltage profile in a distribution system with a large amount of photovoltaic power generation

When large amounts of photovoltaic power generation systems (PV systems) are integrated into power distribution systems, voltage rise due to reverse power flow will be a great concern. Because the PV systems must restrict their output power in case of the voltage rise beyond the statutory upper limit. In order to improve this problem, the cooperative control of reactive power by the PV systems was proposed and the reduction of output suppression loss was estimated for a model distribution system. The result indicated that the output suppression loss is reduced to about 15% while line loss is increased a little, and the sum of the two losses is decreased by half. © 2010 The Institute of Electrical Engineers of Japan.