Distributed Control for DC Microgrid Based on Optimized Droop Parameters

An accurate current sharing method for an Islandeddroop‐controlled dcmicrogrid without communication between remote buses

“…The proposed method is free from this limitation. Further, the method suggested in this paper is cheaper in comparison with communication-based techniques reported so far [19][20][21][22][23][24][25][26][27][28][29][30] and works well even in the presence of local loads connected to buses where DG units are connected (a limitation in communication-less techniques reported in the linterature [31][32][33][34] ). Last but not least, the proposed control technique is resilient to communication delays and noises in feedback paths.…”

“…1 Control methods using low-bandwidth communication channels to achieve accurate sharing of current: Most of the research work reported so far utilize low-bandwidth communication links to update the voltage reference or the droop values for achieving accurate sharing of load current. [19][20][21][22][23][24][25][26][27][28][29][30] Anand et al 19 proposed a reliable decentralized controller employing an average current sharing scheme for achieving accurate current sharing among the parallel connected units in a DCMG. The method proposed by Anand et al 19 uses low-bandwidth communication channels.…”

“…The strategy presented in Ghalebani and Niasati 28 comprises a "non-centralized approach" using LBC, in which errors in current sharing are estimated and fed to adjust droop gains. Shivam and Dahiya 29 proposed a distributed control strategy with particle swarm optimized droop parameters. A distributed secondary controller using a full communication facility was proposed by Islam et al 30 The approach in Islam et al 23 uses the current of each source to update droop gains.…”

“…• No communication requirement between remote buses: Techniques reported in several papers [19][20][21][22][23][24][25][26][27][28][29][30] require LBC between remote buses, limitations of which are as follows: higher expense, significant communication delays impacting the system performance, and loss of current sharing accuracy in case of communication link failure. 32 The approach proposed in this paper uses only local measurements, thereby, doing away with the need for communication links between remote buses.…”

“…Therefore, the proposed control philosophy is more robust in comparison with communication-based techniques reported in the literature. [19][20][21][22][23][24][25][26][27][28][29][30] In methods reported in the above threads of work, [19][20][21][22][23][24][25][26][27][28][29][30] current sharing accuracy is lost in case of a communication link failure. The proposed method is free from this limitation.…”