TY - JOUR
T1 - Assessing the Impact of Reactive Power Droop on Inverter Based Microgrid Stability
AU - Lasheen, Ahmed
AU - Ammar, Mohammed E.
AU - Zeineldin, Hatem H.
AU - Al-Durra, Ahmed
AU - Shaaban, Mostafa F.
AU - El-Saadany, Ehab
N1 - Funding Information:
Manuscript received August 19, 2020; revised December 3, 2020; accepted January 12, 2021. Date of publication January 19, 2021; date of current version August 20, 2021. This work was supported by Project FRG20-L-E112 from the American University of Sharjah. (Corresponding author: Hatem H. Zeineldin.) Ahmed Lasheen and Mohammed E. Ammar are with the Electrical Power Engineering Dep., Cairo University, Giza 12613, Egypt (e-mail: [email protected]; [email protected]).
Publisher Copyright:
© 1986-2012 IEEE.
PY - 2021/9
Y1 - 2021/9
N2 - Droop control is the most common approach for controlling inverter-based micro-grids. The active power droop gain has always been considered as the main parameter for identifying the micro-grid stability margin. Increasing this margin improves the transient performance and provides robustness to the micro-grid for a wide range of operations. Previous work on droop control focused on the active power droop gain, which is required for accurate power sharing as well as for micro-grid stability assessment. This paper utilizes small-signal stability analysis to analyze the impact of the reactive power droop gain on micro-grid stability, which is ignored in previous work. Consequently, a micro-grid domain of stability chart is proposed and defined in the mpmax-nq plane, which represents the zone within which the micro-grid will maintain stable operation. The proposed domain of stability chart is utilized to assess and compare the impact of the conventional and proportional derivative (PD) reactive power droop controller on the micro-grid stability margin. The results show that there exists a reactive power droop gain at which the stability margin is minimum. Furthermore, it has been shown, through the domain of stability chart, that the PD reactive power droop controller is capable and sufficient to significantly increase the micro-grid stability margin while maintaining equal load sharing. Further, the domain of stability chart can serve as a useful tool for defining the micro-grid droop gain operational boundaries and for assessing and comparing inverter-based micro-grid control schemes.
AB - Droop control is the most common approach for controlling inverter-based micro-grids. The active power droop gain has always been considered as the main parameter for identifying the micro-grid stability margin. Increasing this margin improves the transient performance and provides robustness to the micro-grid for a wide range of operations. Previous work on droop control focused on the active power droop gain, which is required for accurate power sharing as well as for micro-grid stability assessment. This paper utilizes small-signal stability analysis to analyze the impact of the reactive power droop gain on micro-grid stability, which is ignored in previous work. Consequently, a micro-grid domain of stability chart is proposed and defined in the mpmax-nq plane, which represents the zone within which the micro-grid will maintain stable operation. The proposed domain of stability chart is utilized to assess and compare the impact of the conventional and proportional derivative (PD) reactive power droop controller on the micro-grid stability margin. The results show that there exists a reactive power droop gain at which the stability margin is minimum. Furthermore, it has been shown, through the domain of stability chart, that the PD reactive power droop controller is capable and sufficient to significantly increase the micro-grid stability margin while maintaining equal load sharing. Further, the domain of stability chart can serve as a useful tool for defining the micro-grid droop gain operational boundaries and for assessing and comparing inverter-based micro-grid control schemes.
KW - and small-signal stability
KW - domain of stability
KW - inverter-based micro-grid
KW - Reactive power droop
KW - stability margin
UR - http://www.scopus.com/inward/record.url?scp=85099732299&partnerID=8YFLogxK
U2 - 10.1109/TEC.2021.3052789
DO - 10.1109/TEC.2021.3052789
M3 - Article
AN - SCOPUS:85099732299
SN - 0885-8969
VL - 36
SP - 2380
EP - 2392
JO - IEEE Transactions on Energy Conversion
JF - IEEE Transactions on Energy Conversion
IS - 3
M1 - 9328533
ER -
