Applications of Real-Time Simulation Technologies in Power and Energy Systems

Real-time (RT) simulation is a highly reliable simulation method that is mostly based on electromagnetic transient simulation of complex systems comprising many domains. It is increasingly used in power and energy systems for both academic research and industrial applications. Due to the evolution of the computing power of RT simulators in recent years, new classes of applications and expanded fields of practice could now be addressed with RT simulation. This increase in computation power implies that models can be built more accurately and the whole simulation system gets closer to reality. This Task Force paper summarizes various applications of digital RT simulation technologies in the design, analysis, and testing of power and energy systems

Practical Design Space Exploration of an H264 Decoder for Handheld Devices Using a Virtual Platform

International audienceH264 is a promising standard for mobile appliances since it allows to play on the tradeoff between data transmission rates and processing needs. This tradeoff is a common issue in mobile appliance design as it leaves space for power savings. We propose here a virtual platform based global approach, i.e. investigating hardware solutions, software solutions and both, to define a set of energy-optimized degraded operating modes for a H264 decoder software. Results of this exploration show that reasonable energy savings for degraded modes can be achieved without loosing too much image quality

Impact of emulated inertia from wind power on under-frequency protection schemes of future power systems

This is an Open Access Article. It is published by Springer under the Creative Commons Attribution 4.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/Future power systems face several challenges. One of them is the use of high power converters that decouple new energy sources from the AC power grid. This situation decreases the total system inertia affecting its ability to overcome system frequency disturbances. The wind power industry has created several controllers to enable inertial response on wind turbines generators: artificial, emulated, simulated, or synthetic inertial. This paper deals with the issues related to the emulated inertia of wind turbines based on full-converters and their effect on the under-frequency protection schemes during the recovery period after system frequency disturbances happen. The main contribution of this paper is to demonstrate the recovery period of under-frequency transients in future power systems which integrate wind turbines with emulated inertia capability does not completely avoid the worse scenarios in terms of under-frequency load shedding. The extra power delivered from a wind turbine during frequency disturbances can substantially reduce the rate of frequency change. Thus it provides time for the active governors to respond

Efficient real-time estimation for DFIG-Performance and reliability enhancement of grid/micro-grid connected energy conversion systems

WOS:00046670160002

Frequency control ancillary service provided by a wind farm: dual-BESS scheme

© 2014, The Author(s). Network frequency control function is incorporated into a grid-connected wind farm-dual battery energy storage system (BESS) scheme. The design of the scheme takes advantage of the rapid response characteristics of the BESS and the in-built short-term overloading capability of the associated power conversion devices. A control strategy to regulate the BESS output power is then proposed. It is shown that the frequency control action offered by the BESS complements amicably with that of conventional generators in enhancing the frequency regulation attribute of the grid system