Abstract
Recently microgrids have drawn a potential attraction by fulfilling the environmental demands and the increasing energy demands of the end-users. It is necessary to focus on various protection and control aspects of a microgrid. During the transition between the grid-following and grid-forming modes, the voltage and the frequency instability due to the power mismatch condition becomes the major point of concern. Therefore, the paper executes a frequency-active power and voltage-reactive power drooping control strategy for the precise power-sharing among the distributed power generators. Furthermore, to handle the power deficit scenarios and to maintain the system stability, a system independent and priority-based adaptive three-stage load shedding strategy is proposed. The sensitivity of the strategy depends on the system inertia and is computed according to the varying absolute rate-of-change-of-frequency. The strategy incorporates the operation of battery storage system and distributed static compensator (D-STATCOM) in the microgrid, to provide a reliable power supply to the customers for a considerable time instead of a sudden load shedding. The effectiveness of the proposed strategies is investigated on a scaled-down modified IEEE 13-bus microgrid system on the podium of MATLAB 2015b through the time-domain simulation.
Highlights
The incorporation of renewable power sources with the power utilities has been a promising solution towards the uninterrupted eco-friendly power demand
The D-STATCOM present in this scenario only responds to suppress the transient variation occurring in the system during the reduction in power generation and load shedding as shown in Fig. 14c and d
The major proposal of the load shedding strategy incorporates the performance of battery storage power during the shedding process, which has been verified in the result analysis
Summary
The incorporation of renewable power sources with the power utilities has been a promising solution towards the uninterrupted eco-friendly power demand. In order to further enhance the adaptive UFLS scheme in accordance with the transient stability, storage elements like ultracapacitor are incorporated to impart dynamic frequency support by [23]. A battery energy storage (BES) device is integrated into the microgrid system to counteract the power deficits. The fast-responding D-STATCOM is considered to deal with the transient events and reactive power deficits and the slow responding battery energy storage systems are considered to prolong the system stability by a certain time span. A detailed analysis of a P-f and Q-V droop control strategy to attain an efficient power-sharing among the different inertial DGs. The paper proposes an independent and prioritybased adaptive three-stage load shedding strategy. To enhance the system stability, the performance of the battery and D-STATCOM present in the microgrid is closely analyzed while executing the load shedding algorithm. The Simulink platform of MATLAB 2015b is used to replicate and test the designed microgrid system
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