Nutkani, I. U.4; Loh, Poh Chiang5; Blaabjerg, Frede2
1 The Faculty of Engineering and Science (ENG), Aalborg University, VBN2 Power Electronic Systems, The Faculty of Engineering and Science (ENG), Aalborg University, VBN3 Department of Energy Technology, The Faculty of Engineering and Science (ENG), Aalborg University, VBN4 Experimental Power Grid Centre, Agency for Science, Technology and Research5 School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore
Although many droop schemes have been proposed for distributed generator (DG) control in a microgrid, they mainly focus on achieving proportional power sharing based on the DG kVA ratings. Other factors like generation costs, efficiencies, and emission penalties at different loads have not been considered even though they are different for different types of DGs. This letter thus proposes an alternative droop scheme, which can better distinguish the different operating characteristics and objectives of the DGs grouped together in a weighted droop expression. The power sharing arrived in the steady state will meet the intended objectives, as demonstrated in the experiment with a defined objective of minimizing the total microgrid operating cost.
I E E E Transactions on Power Electronics, 2014, Vol 29, Issue 3, p. 1047-1052