Abstract: It has been over half century to apply solar PV system from military to civil, from offgrid to gridconnected. Its efficiency keeps increasing, technology improving, and cost cutting down. At present, there is a great tendency to put solar PV system into application. There are also great requirements for developing microgrid system, smartgrid system and global PV power supply system in order to integrate discrete PV power into the existing power grid.

Key words: G.C. Wang , the last years , academic thought ,contribution

, gridconnected PV system, microgrid system, smartgrid system