  This letter proposes a general decentralized control of cascaded
inverters-power factor angle droop control. Compared to the existing control
strategies, it has the following attractive benefits: 1) it is suitable for
both grid-connected and islanded modes; 2) Seamless transition between
different modes can be obtained; 3) stability condition in the grid-connected
mode is independent of the transmission line impedance; 4) it is suited for any
types of loads in islanded modes; 5) multi-equilibrium point problem is
avoided; 6) it is suitable for four quadrant operation. The small signal
stability of the control is proved. And the feasibility of the proposed method
is verified by simulation.
