Active islanding detection method for the grid-connected photovoltaic generation system

摘要: This paper proposes an active islanding detection method incorporated into the control of grid-connected inverter to protect photovoltaic generation system from operation. The proposed performs as a virtual resistor with operation frequency slightly higher or lower than fundamental utility voltage. function will not be actuated when is nominal, and can convert DC power solar array AC power. When strong lost, acts Thus, amplitude local load voltage away their normal values under Hence, immediately detect A prototype developed tested demonstrate performance method. Both computer simulation experimental results verify that expected.