A New Control Strategy Based on PLL to Enhance System Stability under Varying Output Power in Weak Grids

Grid-connected inverters are widely used in the renewable energy such as PV and wind power grid-connected systems. However, actual application results show output power of inverters has an impact on the stability when the system is weak grid. To overcome the stability problem, some control strategies have been proposed. However, few control strategies take into account dynamic response of the syst...