Abstract
Hybrid AC/DC microgrids are of special interest for energization due to their flexibility, low infrastructure investments, reduced conversion losses, and reliability against failures on the utility grid. In these systems, global economic dispatch needs communication between the AC and DC subgrids to achieve a near-optimal solution since the incremental costs of all generators need to be equalized. Hence, this paper proposes a distributed coordination between generators by means of a finite-time controller for the microgrid’s interlinking converter, which ensures an economic operation while taking care of the microgrid power utilization. The latter implies that a multi-objective control is performed by the interlinking converter, which uses shared variables of incremental costs and average powers from distributed generators in AC and DC sides. Also, an adaptive weighting method is proposed to adjust the control effort regarding the average power utilization of a side microgrid. The controller’s performance is verified through simulations and experimental setups. Results show that the proposed strategy is able to perform a trade-off between the two control objectives while achieving a finite-time convergence even though communication delays exist.
Highlights
Traditional centralized electrical systems are integrating new clusters of generation and loads, in which Distributed Generators (DGs) are located near the consumption
CONTRIBUTIONS Motivated by the above discussion, and based on a previous work [24], the authors of this paper propose a control scheme for the Interlinking Converter (ILC) that seeks for the global economic dispatch in hybrid AC/DC MGs
This paper demonstrated through experimental tests and simulations the feasibility of a multi-objective control strategy for the ILC in a hybrid AC/DC MG
Summary
Traditional centralized electrical systems are integrating new clusters of generation and loads, in which Distributed Generators (DGs) are located near the consumption. The latter gives rise to the proliferation of Microgrids (MGs), which are autonomous and can operate either connected or. A promising type of MG is the hybrid AC/DC MG, see Fig. 1, which is able to combine the advantages of both AC and DC MGs while reducing the overall costs by re-utilizing most of the existing AC infrastructure. The additional DC-side network is used to interface DC-based DGs with Energy Storage Systems (ESSs), reducing energy conversion steps in the process [2], [3].
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