PI-Consensus Based Distributed Control of AC Microgrids
Date of Original Version
The conventional voltage observer based distributed control can make a tradeoff between voltage restoration and reactive power sharing. However, it suffers from estimation error when there exist input disturbances, such as initial values and communication delays. To address this problem, this paper proposes a novel distributed secondary control based on PI consensus algorithm. A voltage controller and a frequency controller are designed separately to realize the restoration of voltage/frequency and also accurate reactive/active power allocation. Moreover, a detailed small-signal model with PI consensus algorithm is established to show the impact of the proposed control strategy on the system stability. Compared with the conventional distributed control, the proposed control scheme is simpler with higher control accuracy under input disturbances. Simulations are conducted to verify the effectiveness of the proposed control strategy in an isolated ac microgrid.
IEEE Transactions on Power Systems
Shi, Mengxuan, Xia Chen, Jianyu Zhou, Yin Chen, Jinyu Wen, and Haibo He. "PI-Consensus Based Distributed Control of AC Microgrids." IEEE Transactions on Power Systems 35, 3 (2020): 2268-2278. doi:10.1109/TPWRS.2019.2950629.