| Title |
Droop Control to Compensate Load Voltage Unbalance for Inverter-based Distributed Generations with Unequal Impedance Lines |
| Authors |
양원모(Yang, Won-Mo) ; 김현준(Kim, Hyun-Jun) ; 한병문(Han, Byung-Moon) |
| DOI |
https://doi.org/10.5370/KIEE.2016.65.7.1193 |
| Keywords |
Parallel inverter operation ; Droop control ; Line impedance ; Voltage unbalance compensation |
| Abstract |
This paper proposes a droop control scheme to compensate the unbalanced line-to-line voltage of unbalanced 3-phase load which is coupled with two inverter-based distributed generations through unequal impedance lines. Unbalanced line-to-line load voltages occur due to using single-phase loads, which brings about bad effects on the coupled inverters and the distributed generations. In order to compensate the unbalanced line-to-line voltages, a positive sequence voltage control was used for sharing the active and reactive power and a negative sequence control was used for reducing the negative sequence voltage. The feasibility of the proposed scheme was first verified by computer simulations, and then experiments with a hardware set-up built in the lab. The experimental results were compared with the simulation results to confirm the feasibility of the proposed scheme. |