The big national project on PV system has been started since two years ago. The target of this project is to solve technical problems such as restriction of PV system output, higher harmonics and islanding operation where PV systems are clustered in a residential district. In this project, about 600 grid-connected PV systems with battery installed at residential houses and are monitored at all times. The results obtained in this project are expected to provide information and technologies to increase the further introduction of PV systems.
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