TY - JOUR
T1 - A Multi-Functional Fully Distributed Control Framework for AC Microgrids
AU - Shafiee, Qobad
AU - Nasirian, Vahidreza
AU - Quintero, Juan Carlos Vasquez
AU - Guerrero, Josep M.
AU - Davoudi, Ali
PY - 2018/7
Y1 - 2018/7
N2 - This paper proposes a fully distributed control methodology for secondary control of AC microgrids. The control framework includes three modules: voltage regulator, reactive power regulator, and active power/frequency regulator. The voltage regulator module maintains the average voltage of the microgrid distribution line at the rated value. The reactive power regulator compares the local normalized reactive power of an inverter with its neighbors’ powers on a communication graph and, accordingly, fine-tunes Q-V droop coefficients to mitigate any reactive power mismatch. Collectively, these two modules account for the effect of the distribution line impedance on the reactive power flow. The third module regulates all inverter frequencies at the nominal value while sharing the active power demand among them. Unlike most conventional methods, this controller does not utilize any explicit frequency measurement. The proposed controller is fully distributed; i.e., each controller requires information exchange with only its neighbors linked directly on the communication graph. Steadystate performance analysis assures the global voltage regulation, frequency synchronization, and proportional active/reactive power sharing. An AC microgrid is prototyped to experimentally validate the proposed control methodology against the load change, plug-and-play operation, and communication constraints such as delay, packet loss, and limited bandwidth.
AB - This paper proposes a fully distributed control methodology for secondary control of AC microgrids. The control framework includes three modules: voltage regulator, reactive power regulator, and active power/frequency regulator. The voltage regulator module maintains the average voltage of the microgrid distribution line at the rated value. The reactive power regulator compares the local normalized reactive power of an inverter with its neighbors’ powers on a communication graph and, accordingly, fine-tunes Q-V droop coefficients to mitigate any reactive power mismatch. Collectively, these two modules account for the effect of the distribution line impedance on the reactive power flow. The third module regulates all inverter frequencies at the nominal value while sharing the active power demand among them. Unlike most conventional methods, this controller does not utilize any explicit frequency measurement. The proposed controller is fully distributed; i.e., each controller requires information exchange with only its neighbors linked directly on the communication graph. Steadystate performance analysis assures the global voltage regulation, frequency synchronization, and proportional active/reactive power sharing. An AC microgrid is prototyped to experimentally validate the proposed control methodology against the load change, plug-and-play operation, and communication constraints such as delay, packet loss, and limited bandwidth.
KW - AC microgrid
KW - Secondary control
KW - Inverters
KW - Droop control
KW - Distributed control
KW - Cooperative control
UR - http://www.scopus.com/inward/record.url?scp=85049023569&partnerID=8YFLogxK
U2 - 10.1109/TSG.2016.2628785
DO - 10.1109/TSG.2016.2628785
M3 - Journal article
SN - 1949-3053
VL - 9
SP - 3247
EP - 3258
JO - I E E E Transactions on Smart Grid
JF - I E E E Transactions on Smart Grid
IS - 4
ER -