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The optimal operation of a rail vehicle with on-board energy storage device minimizing energy consumption in catenary free mode is discussed in this paper. The electric double layer capacitor (EDLC) is assumed as an energy storage device because of its high power density, long lifetime and quick charge/discharge. The proposed method can determine the optimal acceleration/deceleration at each sampling...
This paper proposes a global supervision for Hybrid Renewable Energy Systems (HRES), integrating fixed speed wind generators and variable speed small hydropower plant and a storage unit. This supervisor must improve the grid insertion of renewable distributed generations by associating it with a short-term storage unit. The supervision system is structured in four levels. Level 1 and Level 2 are considered...
Solar converters to feed the energy from the solar module into the AC grid consist of a DC/DC and a three phase DC/AC converter decoupled by a capacitor in the DC link which is to be minimized. A current fed instead of a voltage fed full bridge DC/DC converter is chosen and leads to a higher efficiency. Furthermore undesirable voltage spikes can be avoided by the use of this topology. This paper presents...
EDLCs (Electric Double Layer Capacitors) offer high energy density and long life span, so various applications may be anticipated in the realm of energy storage devices, such as those used in electric vehicles or electric power stabilisation in power systems, etc. However, since the voltage limit is low of the devices, it is necessary to connect them in series or parallel. In addition, it is required...
Utilization of low power indoor devices such as remote sensors, supervisory and alarm systems, distributed controls, and data transfer system are on steady rise. Due to remote and distributed nature of these systems, it is attractive to avoid using electrical wiring to supply power to them. Primary batteries have been used for this application for many years but they require regular maintenance at...
Integration of energy storage (ES) into a static synchronous compensator (StatCom) makes it possible for the StatCom to provide a certain amount of active power as well as reactive power support. The possible benefit of the additional active power support of a StatCom can be power oscillation damping capability, mitigation of phase-jump related disturbances, etc. Direct connection of an ES device...
Sliding mode control of boost converter is studied. In order to improve dynamical performances with static and dynamic specifications, we propose a systematic procedure to compute the gains of the controller based on an optimization scheme. This method is applied to the control of an energy storage system based on supercapacitors technology in order to regulate the output voltage. Given a system with...
The objective of this work is to discuss the concept of HVDC link with energy storage, especially with superconducting magnetic energy storage (SMES). The SMES will be one of the candidates as a power storage system for load leveling and power stabilization. Using superconducting coils instead of DC reactors, the SMES can be incorporated into the HVDC link. However, in large-scale SMES, the superconducting...
This paper presents a supercapacitor-based dynamic support system for hybrid microgrids that guarantees the safe transition between operation modes (parallel / stand alone) and the correct dynamic power balance in stand-alone mode. The paper describes the design and development of the hardware and software components of a microgrid support system that has been implemented as a 7.8 kW single phase...
Today's innovative technologies for railway electrification and rolling stock enable an energy efficient operation of railway vehicles supplied by the overhead contact line. In case there is no possibility to recover the braking energy, an onboard energy storage unit allows absorption of this energy for re-use. Therefore the energy consumption and the emission of ldquoGreenhouse gasesrdquo, e.g. CO...
Application of high efficiency energy storage techniques may stimulate in a near future a larger exploitation of renewable energy sources. Energy storage, in fact, not only can improve the quality of produced power, but also make possible the implementation of sophisticated energy management strategies, fully decoupling the power delivery from power generation. In such a scenario, Vanadium Redox Batteries...
This paper presents research motivated by industrial demand for energy storage system for city transport vehicles. Our city transport has problems with stability of the trolley line voltage at the several places in the city a therefore this research has been started. Energy storage system with supercapacitors is one solution. The kinetic energy is accumulated into the supercapacitor during vehicle...
This paper investigates embedding Energy Storage (ES) with multiple wind turbines in order to deliver to the grid a smooth and constant power as demanded by the system operator. The demand power is shared by DFIGs proportional to their ratings utilizing classical voltage and frequency droop characteristics. The paper addresses the system control methodologies for delivering constant power to the grid...
For some urban railway, power-feeding system using the third rail has been applied. But, at crossing points, the third rail can't be equipped because of construction limit. Sequential regeneration absorber would make it possible to decelerate vehicle continuously by charging of regenerative power if the third rail was not equipped.
One of the difficulties concerning battery monitoring applications is the current measurement. Typically the measurement range (DC) can vary from 10 mA up to 1000 A. Today's available current transducers are not well adapted to work with good accuracy in this very large domain. In this paper a new measurement principle based on a technology of type ldquofluxgaterdquo [1] is presented, which allows...
Using a flywheel and a squirrel-cage induction motor, this paper proposes two inverter-less applications for electrical power quality improvement by compromising a little frequency fluctuations; (1) a voltage sag compensator using a capacitor self-excited induction generator without semiconductor power converters, (2) blackout delay system for industrial robots safety shutdown. In the first section,...
This paper proposes a new circuit configuration of an energy storage system, consisting of EDLC and its inverters connected in series to main motor windings and utilizing the overvoltage durability of traction motors. Our proposed system enables improved performance of the powering and the regenerative braking at the ever high speed region, without increasing traction motor current.
The energy consumption of consumer electronics while in off state is a never ending discussion and leads to always improving and more complex solutions. This paper shows our experiences with a concept completely removing such consumption while maintaining the most important remote control functionality.
The hybrid control system, which is a combination of cascade control and local control, is proposed as a method to compensate power fluctuations caused by load and renewable energy sources in a microgrid with distributed power generation systems (DGs). The use of energy storage system (ESS) such as EDLC facilitates power compensation. However, since the energy capacities of these components are limited,...
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