There are mainly two approaches to provide output voltage droop characteristics in droop method: program voltage reference by load current and limiting the DC gain of the voltage loop compensator.

For system of parallel connected inverters without wire interconnections, using conventional PQ droop control method always results in the problems in dynamic performance.

The proposed control strategy is based on the well-known power droop control method, which consists of an active power sharing control loop and a reactive power sharing control loop.

Secondly, the frequency stability of a MicroGrid, in which the frequency is regulated by different micro sources using P-f & Q-V droop control,was analyzed.

The defects of conventional droop control strategy are analyzed that applied in microgrid system, and the synthetic control strategy composed of droop control and inverse droop control strategy is proposed.

Outer loop of UPFC bus voltage control system adopts voltage droop control that consists of PI regulation and scaling factors of droop characteristic.

The control scheme of the traditional droop characteristic in the parallel operation of UPS without control interconnection is based on frequency-droop and amplitude-droop scheme to control the output voltage.

Study on parallel operation of inverters based on droop method;