Parallel operation technology of inverters based on improved droop control
XU Yuqin;MA Huanjun;School of Electrical and Electronic Engineering, North China Electric Power University;
When the transmission line impedances are different, traditional droop control is difficult to realize reasonable load power sharing in parallel inverters. Thus, an improved droop control scheme based on inverters output voltage adjustment is presented. Reference voltage amplitude of each invrter is adjusted roughly by using the relationship between it and the output power. Since it leads to much electrical fluctuation, an output voltage minute adjustment by drooping coefficient is added. Two inverters with the same capacity and different line parameters are carried out, and simulation results using the traditional and proposed schemes are compared and analyzed. The results show that the proposed scheme achieves power sharing and good power quality, and the circulating current is small.
【CateGory Index】： TM464