Output leveling of wind power generation system by EDLC energy storage system

Abstract

SUMMARYUtilization of renewable energy is becoming increasingly important from the viewpoints of environmental protection and conservation of fossil fuel. However, the generating power of renewable energy is always fluctuating due to the environmental status. Energy storage systems are indispensable in compensating these fluctuating components. An energy capacitor system (ECS) composed of an electric double-layer capacitor (EDLC) with power-electronics devices is useful for compensation of fluctuating power, since it is capable of controlling both active and reactive power simultaneously. This paper proposes a current-source ECS (CS-ECS), which consists of an EDLC, a bidirectional buck-boost DC-DC converter, and a bidirectional inverter. We present the control systems for active/reactive power control of CS-ECS, and show the effectiveness of CS-ECS through computer simulations for the case of a wind power generation system.

Improved load frequency characteristics with genetically tuned supercapacitor energy storage in interconnected power system

“…In majority of short-term operations, needing the supercapacitor to supply power for some seconds, the sluggish branch can be ignored. Generally for standard operations the capacitor voltage dependency is also disregarded and the supercapacitor is designed solely as resistance in series with a lumped capacitance as described in Kinjo et al (2006) and Zubieta and Bonert (2000).…”

Improved load frequency characteristics with genetically tuned supercapacitor energy storage in interconnected power system

“…In majority of short-term operations, needing the supercapacitor to supply power for some seconds, the sluggish branch can be ignored. Generally for standard operations the capacitor voltage dependency is also disregarded and the supercapacitor is designed solely as resistance in series with a lumped capacitance as described in Kinjo et al (2006) and Zubieta and Bonert (2000). converter (VSC), interlinked by a dc-dc bidirectional buck-boost convertor via a dc-link capacitor.…”

High ion adsorption densities of site-selective nitrogen doped carbon sheets prepared from natural lignin

“…For such a purpose, electric doublelayer capacitors (EDLCs) present a more effective solution. [2][3][4] Unlike the secondary batteries, EDLCs store electric energy just by adsorbing electrolyte ions on the surface of electrodes without any chemical reactions. Therefore, it is possible to charge and discharge EDLCs in a short time.…”