EPE Journal Volume 17-4 
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EPE Journal Volume 17-4 - Editorial
EPE Journal Volume 17-4 - In Memoriam
EPE Journal Volume 17-4 - Other
EPE Journal Volume 17-4 - Papers



 EPE Journal Volume 17-4 - Editorial 

A Special Edition on “Innovative Concepts of Generating Systems with Energy Management”  [Details]
By E. Monmasson

A Special Edition on “Innovative Concepts of Generating Systems with Energy Management”, written by Prof. Eric Monmasson and Prof. Benoît Robyns


 EPE Journal Volume 17-4 - In Memoriam 

In Memoriam André J.A. Vandenput (1949 - 2008)  [Details]
By B. Sneyers

In Memoriam André J.A. Vandenput (1949 - 2008), written by B. Sneyers


 EPE Journal Volume 17-4 - Other 

Wind Power to the Grid - EPE Wind Energy Chapter – 1st Seminar  [Details]
By B. Sneyers

The seminar will take place on 27 and 28 March 2008, at Delft University of Technology, Delft, The Netherlands. Plenary sessions, lecture and dialogue sessions will be organized in the best EPE tradition to provide maximum networking opportunities. Worldwide experts in the field are expected to take part in the event to exchange best practice and learn from experience with a special focus on industry and technology.


 EPE Journal Volume 17-4 - Papers 

Energy Storage and Management in Wind Turbine Generator Systems  [Details]
By C. Abbey; J. Chahwan; G. Joos

Large amounts of wind energy negatively impact the operation and security of power systems. Energy storage has the potential to shape the wind characteristics so that a wind turbine generator behaves more like a conventional generator, thereby making it easier to manage its integration. This paper considers the role that energy storage can play in the evolution of wind generator technologies. A basic structure for multi-level storage systems is proposed and it is implemented for a two-level energy storage system. Simulation and experimental results confirm that the algorithm can be used to coordinate the operation of two storage levels to provide a prescribed amount of power, effectively smoothing the power fluctuations due to the wind.

Efficiency Considerations and Measurements of a Hybrid Energy Storage System based on Compressed Air and Supercapacitors  [Details]
By S. Lemofouet; A. Rufer

This paper presents the study and experimentation of a hybrid energy storage system based on Compressed Air, where the storage and discharge are done within maximum efficiency conditions for the volumetric machine. As these maximum efficiency conditions impose the level of the converted power, an intermittent time-modulated operation mode is applied to the thermodynamic converter to obtain a variable converted power. A smoothly variable output power is achieved with the help of a supercapacitive auxiliary storage device used as a filter. The paper describes the concept of the system and reports the theoretical evaluation of its energetic efficiency, as well as the measured performances form a first experimental prototype.

Energy Performance of a New Stirling Micro Cogenerator  [Details]
By I. Garcia Burrel; S. Le Ballois; L. Prévond; E. Monmasson

The simultaneous production of heat and power at a small-scale is already a well known technique. Cogeneration is one of the main ways to bring about decentralized, embedded, localized and/or autonomous power production. However, it is still a challenge to design cogenerators to be below 10 kW as required for the smallest applications such as providing heat and power to a single house (see Fig.1). This paper specifically introduces a Stirling micro-cogeneration system whose nominal power is 1 kW. The system connects a new "double-effect" Stirling engine with a linear induction generator. The connection is done via the engine's piston that serves also as the secondary (mover) of the generator. First of all, the system is described, then, a state-space model of the co-generator under steady-state oscillatory conditions is presented in order to synthesize a controller that ensures robust stability and desired performances through the resistant effort created by the generator on the piston. Finally, an real rotating emulator is developed to study the energetic viability of the cogenerator.

Variable Speed Small Hydro Power Plant Connected to AC Grid or Isolated Loads  [Details]
By S. Breban; M. Nasser; A. Ansel; C. Saudemont; B. Robyns; M. Radulescu

Small size hydro plants are commonly constituted of fixed speed drives. To allow extended control features for these sources in order to integrate them into the energy grid, an autonomous variable speed doubly fed induction generator (DFIG) based source involving power electronics is proposed. Modelling process of the DFIG is described; it leads to a unified control strategy for operation on a power grid or isolated loads. Control scheme of the whole station for both operating modes is assessed by means of simulations. At this stage, transition from grid connected mode to isolated one is discussed. In a second stage this non conventional hydropower plant is tested experimentally on isolated loads and also in grid connection mode with the help of a 3 kW DC machine based turbine emulator.

Laboratory Simulation of the Adjustable Speed Generation Systems  [Details]
By Z. Chlodnicki; W. Koczara; N. Al-Khayat

The following paper presents an adjustable speed stand alone generating system. The system – also called variable speed generating system is a modern technique that has a great number of advantages over a conventional synchronous generator driven with constant speed. In the adjustable speed generating system the prime mover drives a permanent magnet generator producing variable frequency and amplitude AC voltage. The variable voltage is conditioned by an AC/AC power electronic converter providing high quality multiphase AC constant frequency sinusoidal voltage. Decoupling the speed of the generator and output voltage frequency provides a new way for optimizing prime mover like reducing its rated power, weight, emission and size. In such generating systems the prime mover speed control strategy is essential subject of investigation. The paper discusses the design and performance of a laboratory rig which is used to test and to evaluate different adjustable speed generating system topologies and control strategies. The built test rig is designed in such a way that is easy to implement these topologies and control strategies. Therefore the test rig is called "simulator". The paper shows the methods of speed control and performance of the stand alone adjustable speed generating system according to the implemented methods. The generating system has also been equipped with an additional controlled energy storage system made of supercapacitor bank. The energy provided by the supercapcitors can help achieve good transient performance. Preliminary tests validated methods of speed control. Presented laboratory tests results with/without supercapacitor controlled energy storage system validate the quality of the output voltage during transient states caused by steps of load of the adjustable speed generating systems.