Journal ArticleDOI
Distribution Voltage Control for DC Microgrids Using Fuzzy Control and Gain-Scheduling Technique
TLDR
In this paper, a low-voltage bipolar-type dc microgrid with two energy storage units and a dc/dc converter was proposed to achieve both power sharing and energy management.Abstract:
Installation of many distributed generations (DGs) could be detrimental to the power quality of utility grids. Microgrids facilitate effortless installation of DGs in conventional power systems. In recent years, dc microgrids have gained popularity because dc output sources such as photovoltaic systems, fuel cells, and batteries can be interconnected without ac/dc conversion, which contributes to total system efficiency. Moreover, high-quality power can be supplied continuously when voltage sags or blackouts occur in utility grids. We had already proposed a “low-voltage bipolar-type dc microgrid” and described its configuration, operation, and control scheme, through experiments. In the experiments, we used one energy storage unit with a dc/dc converter to maintain the dc-bus voltage under intentional islanding operation. However, dc microgrids should have two or more energy storage units for system redundancy. Therefore, we modified the system by adding another energy storage unit to our experimental system. Several kinds of droop controls have been proposed for parallel operations, some of which were applied for ac or dc microgrids. If a gain-scheduling control scheme is adopted to share the storage unit outputs, the storage energy would become unbalanced. This paper therefore presents a new voltage control that combines fuzzy control with gain-scheduling techniques to accomplish both power sharing and energy management. The experimental results show that the dc distribution voltages were within 340 V ± 5%, and the ratios of the stored energy were approximately equal, which implies that dc voltage regulation and stored energy balancing control can be realized simultaneously.read more
Citations
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Proceedings ArticleDOI
New technique for power sharing in DC microgrids
TL;DR: In this paper, the authors proposed a different power sharing technique which can be applied for both current load and power sharing techniques, and in single or multi-loads in a microgrid.
Journal ArticleDOI
PMSG-Based Wind Energy Conversion Systems Integration Into DC Microgrids With a Novel Compact Converter
TL;DR: An isolated single-stage AC-DC converter is proposed that is able to perform all the required function of a WECS AC- DC conversion unit, to overcome the drawbacks of the two-converter structure.
Proceedings ArticleDOI
Effective Power Management of DC Microgrids Using Adaptive Droop Control
TL;DR: An adaptive droop controller is developed for DC microgrids in order to balance the state of charge (SOC) for different connected batteries, and also to keep the bus voltage within the allowed limits.
Proceedings ArticleDOI
Distributed dynamic consensus for reliable and economic operation of standalone dc microgrids
TL;DR: In this paper, a distributed control for DC microgrids that minimizes the total generation cost and regulates the average voltage at the desired value is presented, where a sparse communication network with a balanced laplacian matrix is used for data exchange between converters.
Proceedings ArticleDOI
A distributed cooperative control strategy based on consensus algorithm in DC microgrid
Xinlu Zhang,Mi Dong,Jing Ou +2 more
TL;DR: A distributed cooperative control strategy based on the consensus algorithm is proposed for the voltage regulation and load distribution in DC microgrid, which can achieve DC bus voltage recovery and eliminate average voltage deviation, while ensuring proportional load sharing among sources.
References
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Journal ArticleDOI
Hierarchical control of droop-controlled DC and AC microgrids — a general approach towards standardization
TL;DR: The hierarchical control derived from ISA-95 and electrical dispatching standards to endow smartness and flexibility to MGs is presented and results are provided to show the feasibility of the proposed approach.
Journal ArticleDOI
Progress in electrical energy storage system: A critical review
TL;DR: In this paper, a review of electrical energy storage technologies for stationary applications is presented, with particular attention paid to pumped hydroelectric storage, compressed air energy storage, battery, flow battery, fuel cell, solar fuel, superconducting magnetic energy storage and thermal energy storage.
Journal ArticleDOI
Adaptive Decentralized Droop Controller to Preserve Power Sharing Stability of Paralleled Inverters in Distributed Generation Microgrids
TL;DR: In this paper, an adaptive decentralized droop controller of paralleled inverter-based distributed generation (DG) units is presented to preserve the power sharing stability, which is based on the static droop characteristics combined with an adaptive transient droop function.
Journal ArticleDOI
Low-Voltage Bipolar-Type DC Microgrid for Super High Quality Distribution
TL;DR: In this paper, a low-voltage bipolar-type dc microgrid is proposed to supply super high quality power with three-wire dc distribution line. But, the proposed system is not suitable for large-scale systems.
Journal ArticleDOI
Fuzzy-Logic-Control Approach of a Modified Hill-Climbing Method for Maximum Power Point in Microgrid Standalone Photovoltaic System
TL;DR: In this article, a fuzzy-logic controller for maximum power point tracking of photovoltaic (PV) systems is proposed, which improves the hill-climbing search method by fuzzifying the rules of such techniques and eliminates their drawbacks.