TY - JOUR
T1 - Small-Signal Analysis of the Microgrid Secondary Control Considering a Communication Time Delay
AU - Coelho, Ernane Antônio Alves
AU - Wu, Dan
AU - Guerrero, Josep M.
AU - Vasquez, Juan C.
AU - Dragičević, Tomislav
AU - Stefanović, Čedomir
AU - Popovski, Petar
PY - 2016/10
Y1 - 2016/10
N2 - This paper presents a small-signal analysis of an islanded microgrid composed of two or more voltage-source inverters connected in parallel. The primary control of each inverter is integrated through an internal current and voltage loops using proportional resonant compensators, a virtual impedance, and an external power controller based on frequency and voltage droops. The frequency restoration function is implemented at the secondary control level, which executes a consensus algorithm that consists of a load-frequency control and a single time delay communication network. The consensus network consists of a time-invariant directed graph and the output power of each inverter is the information shared among the units, which is affected by the time delay. The proposed small-signal model is validated through simulation results and experimental results. A root locus analysis is presented that shows the behavior of the system considering control parameters and time delay variation.
AB - This paper presents a small-signal analysis of an islanded microgrid composed of two or more voltage-source inverters connected in parallel. The primary control of each inverter is integrated through an internal current and voltage loops using proportional resonant compensators, a virtual impedance, and an external power controller based on frequency and voltage droops. The frequency restoration function is implemented at the secondary control level, which executes a consensus algorithm that consists of a load-frequency control and a single time delay communication network. The consensus network consists of a time-invariant directed graph and the output power of each inverter is the information shared among the units, which is affected by the time delay. The proposed small-signal model is validated through simulation results and experimental results. A root locus analysis is presented that shows the behavior of the system considering control parameters and time delay variation.
KW - Delay differential equations (DDEs)
KW - Frequency and voltage droop control
KW - Secondary control
KW - Small-signal analysis
UR - http://www.scopus.com/inward/record.url?scp=84987850943&partnerID=8YFLogxK
U2 - 10.1109/TIE.2016.2581155
DO - 10.1109/TIE.2016.2581155
M3 - Journal article
AN - SCOPUS:84987850943
SN - 0278-0046
VL - 63
SP - 6257
EP - 6269
JO - IEEE Transactions on Industrial Electronics
JF - IEEE Transactions on Industrial Electronics
IS - 10
M1 - 7492603
ER -