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
Three-Level DC Converter for Balancing DC 800-V Voltage
TL;DR: A three-level dc converter for balancing the dc input voltage is studied, which has a similar topology with the conventional three- level dc converter and is found to have a good ability of balancing the input voltage.
Journal ArticleDOI
Intelligent Power Sharing of DC Isolated Microgrid Based on Fuzzy Sliding Mode Droop Control
TL;DR: The sliding mode droop controller is designed for compensating the uncertainties and disturbances to derive accurate power sharing based on T–S fuzzy model and is proved to be effective under variable operating conditions through PSIM/MATLAB simulation.
Journal ArticleDOI
Autonomous Voltage Regulation and Current Sharing in Islanded Multi-Inverter DC Microgrid
TL;DR: This paper presents a state-of-charge (SoC)-based current sharing method through the incorporation of SoC and capacity information into the double closed-loop control for ESUs, which effectively eliminates the dc bus voltage deviation, and simultaneously guarantees the SoC balance among individual ESUs.
Journal ArticleDOI
Nonlinear Control of a Buck Converter Which Feeds a Constant Power Load
TL;DR: In this paper, a nonlinear control strategy for controlling a dc/dc buck converter feeding a constant power load is proposed to improve the transient performance when in presence of unknown power disturbances.
Journal ArticleDOI
An FPGA-Based Gain-Scheduled Controller for Resonant Converters Applied to Induction Cooktops
TL;DR: In this article, an FPGA-based gain scheduled controller is proposed for domestic induction heating appliances, which makes use of the information of the modulation parameters and an online impedance identification system.
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.
Journal ArticleDOI
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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.