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
Grouping Control Strategy for Battery Energy Storage Power Stations Considering the Wind and Solar Power Generation Trend
Wei Guo,Wenyi Fan,Yang Zhao,Jiakun An,Chunguang He,Xiaomei Guo,Yanan Qian,Libo Ma,Hongshan Zhao +8 more
TL;DR: In this paper , the optimal power distribution problem of battery energy storage power stations containing multiple energy storage units has been studied, and a grouping control strategy considering the wind and solar power generation trend is proposed.
Proceedings ArticleDOI
An Improved Droop Control for DC Microgrid Based on Fuzzy Logic Algorithm
TL;DR: In this article , a fuzzy logic-based improved droop control scheme and two fuzzy controllers for the current compensation and bus voltage compensation, respectively, were designed to improve current equalization accuracy and DC bus voltage stability.
Journal ArticleDOI
Hybrid-wave modulation for modular multilevel high-frequency DC converter in DC distribution application
TL;DR: In this paper, a hybrid-wave modulation strategy, which composed of QSW and SW modulation, is proposed for high-frequency modular multilevel DC converter (MDCC), which connects the low-voltage DC link with medium- or high-volatile DC links, becomes a practical equipment to realize the bus connection, voltage conversion, and electrical isolation.
Journal ArticleDOI
Droop-Inspired Nonlinear Control of a DC Microgrid for Integration of Electrical Mobility Providing Ancillary Services to the AC Main Grid
TL;DR: In this article , an electric vehicle (EV) charging station that provides ancillary services to the main AC grid, such as frequency support and synthetic inertia, is described. But, due to the Direct Current (DC) nature of these loads and the easier integration of renewable energies, a DC Microgrid is considered to power the charging station.
References
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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.
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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.