Journal ArticleDOI
Output levelling of renewable energy by electric double-layer capacitor applied for energy storage system
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TLDR
In this article, a current-source ECaSS (CS-ECS) is proposed, which consists of EDLC, bi-directional DC-DC converter, and current source inverter.Abstract:
Utilization of renewable energy are coming up from view points of environmental conservation and depletion of fossil fuel. However, the generated power from renewable energies is always fluctuating due to environmental status. Energy storage system is indispensable to compensate these fluctuating components. Energy capacitor system (ECaSS) connected an electric double-layer capacitor (EDLC) with power-electronics devices is useful for the compensation of fluctuating power since one is capable of controlling both active and reactive power simultaneously. This paper proposes the current-source ECaSS (CS-ECS), which consists of EDLC, bi-directional DC-DC converter, and current-source inverter. We have presented the control system for the active/reactive power control of CS-ECS, and have shown the effectiveness of CS-ECS through computer simulations for case of wind power generation system.read more
Citations
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Journal ArticleDOI
Advanced Control Architectures for Intelligent Microgrids—Part I: Decentralized and Hierarchical Control
TL;DR: Decentralized, distributed, and hierarchical control of grid-connected and islanded microgrids that mimic the behavior of the mains grid is reviewed.
Journal ArticleDOI
Review of energy system flexibility measures to enable high levels of variable renewable electricity
TL;DR: In this paper, the authors review different approaches, technologies, and strategies to manage large-scale schemes of variable renewable electricity such as solar and wind power, considering both supply and demand side measures.
Journal ArticleDOI
Advanced Control Architectures for Intelligent Microgrids—Part II: Power Quality, Energy Storage, and AC/DC Microgrids
TL;DR: The use of static synchronous compensator in grid-connected microgrids is introduced in order to improve voltage sags/swells and unbalances and the coordinated control of distributed storage systems and ac/dc hybrid micro grids is explained.
Journal ArticleDOI
Battery Energy Storage Station (BESS)-Based Smoothing Control of Photovoltaic (PV) and Wind Power Generation Fluctuations
TL;DR: In this article, a smoothing control method for reducing wind/photovoltaic (PV)/BESS hybrid output power fluctuations and regulating battery state of charge (SOC) under the typical conditions is proposed.
Journal ArticleDOI
Statistical Analysis of Wind Power Forecast Error
TL;DR: In this article, an indirect algorithm based on the Beta pdf is proposed to obtain a more appropriate probability density function (pdf) of the wind power forecast error, which can be categorized as fat-tailed.
References
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Journal ArticleDOI
Characterization of double-layer capacitors (DLCs) for power electronics applications
L. Zubieta,R. Bonert +1 more
TL;DR: In this article, the double-layer capacitor (DLC) for power applications is presented, and an equivalent circuit model consisting of three RC branches, one of them with a voltage-dependent capacitance is presented.
Proceedings ArticleDOI
Optimization of double layer capacitor arrays
R.L. Spyker,R.M. Nelms +1 more
TL;DR: In this paper, the design of a double layer capacitor bank interfaced to a constant power load though a DC-DC power converter is examined. But the design is restricted to a single-layer capacitor.
Journal ArticleDOI
A study of series‐parallel changeover circuit of a capacitor bank for an energy storage system utilizing electric double‐layer capacitors
TL;DR: In this article, the authors have studied feasible basic circuit configurations and control methods required to apply electric double-layer capacitors as an energy storage element in output-power leveling systems for solar cells or windmill power generators, and in uninterruptible power supply systems.
Journal ArticleDOI
A basic study on power storage capacitor systems
Abstract: Storage batteries or pumped hydraulic power stations have been used to store electric energy. However, there are problems with storage batteries, e.g., long charging time, limited cycle life, low Coulomb efficiency, and inaccurate residual power meters. Because of these problems, practical power applications have not been achieved.
To solve these problems, a complex system of capacitors and electronic circuits called the ECS (Energy Capacitor System) is proposed. The capacitor part of the ECS is a group of electric double-layer capacitors of increased energy density. The circuits part is built around switching regulators. Although the capacitors alone are not capable of delivering stable output, the accompanying circuits compensate for various characteristics throughout the charge and discharge cycle.
This combination of capacitors and electronic circuits increases the energy density by about 16 times that of the conventional electric double-layer capacitors, close to the level of lead-acid batteries but with lower output resistance and better voltage stability. The ECS inherently features short charging time, very long cycle life, and good Coulomb efficiency. The cells are completely sealed and made from materials which are not harmful to the environment.
Journal ArticleDOI
Novel Utility-interactive Electrical Energy Storage System by Electrical Double Layer Capacitors and an Error Tracking Mode PWM Converter
TL;DR: In this paper, a novel electrical energy storage system interacting to a commercial ac network was designed and evaluated by experiments, which consists of an ac/dc converter with a constantly-sampled PWM scheme termed Error Tracking Mode and electrical double layer capacitors paralleled by monitor circuits.