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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Journal ArticleDOI
A survey on cooperative control strategies for DC microgrids
TL;DR: In this article , a survey of cooperative control strategies for multiple distributed generators in DC microgrids is presented, and three popular coordinated control strategies are compared: decentralized control, centralized control, and distributed control.
Journal ArticleDOI
Topology Analysis and Power Sharing Control of a Two-Stage Three-Port Hybrid Energy Storage Converter for DC Microgrids
TL;DR: In this article, a two-stage three-port hybrid energy storage system (HESS) in dc micro-grids (MGs) is proposed, where a phase shift and duty-cycle combined control is adopted.
Journal ArticleDOI
An Innovative Adaptive Droop Control Based on Available Energy for DC Micro Distribution Grids
TL;DR: The effective adaptive coordinated droop control of multi-battery energy storage systems (MBESSs) in DC distribution grids is presented and the dual-objectives, which are stabilization of DC voltages especially through disturbance for instance outage of BESS and enhancement of State of Charge-balance speed among BESSs, can be achieved.
Journal ArticleDOI
Decentralized PV–BES Coordination Control With Improved Dynamic Performance for Islanded Plug-n-Play DC Microgrid
Dong Li,Carl Ngai Man Ho +1 more
TL;DR: The detailed design, analysis, and implementation of the proposed PV–BES coordination control for Plug-n-Play (PnP) dc microgrid (MG) is provided and the simulation and experimental results have been provided to verify the concept and analytical study.
Journal ArticleDOI
Structural Improvements in Consensus-Based Cooperative Control of DC Microgrids
Muhammad Adnan Mumtaz,Muhammad Mansoor Khan,Xiangzhong Fang,Muhammad Umair Shahid,Muhammad Talib Faiz +4 more
TL;DR: A four-node-based DC microgrid setup was developed in MATLAB/Simulink environment, and simulation results of the proposed and existingtechniques were scrutinized, and the effectiveness of a proposed finite-gain controller was demonstrated.
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.