Assessing the Impact of Reactive Power Droop on Inverter Based Microgrid Stability

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...

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Bibliographic Details
Published in:IEEE transactions on energy conversion 2021-09, Vol.36 (3), p.2380-2392
Main Authors: Lasheen, Ahmed, Ammar, Mohammed E., Zeineldin, Hatem H., Al-Durra, Ahmed, Shaaban, Mostafa F., El-Saadany, Ehab
Format: Article
Language:English
Subjects:
Active control
and small-signal stability
Control stability
Controllers
Distributed generation
domain of stability
Domains
Frequency control
Impact analysis
inverter-based micro-grid
Inverters
Load sharing
Mathematical model
Microgrids
Parameter identification
Power system stability
Proportional derivative
Reactive power
Reactive power droop
Stability analysis
Stability criteria
stability margin
Transient performance
Voltage control
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Summary: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 mp max -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.
ISSN:0885-8969
1558-0059
DOI:10.1109/TEC.2021.3052789