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Distributed generation (DG) has gained popularity in recent years due to the increasing requirement for renewable power sources. A problem that exists with DG systems is the islanding of DG units that creates safety issues for personnel as well as the potential for damage to utility infrastructure. Therefore, islanding detection methods are utilized to mitigate the risk of islanded operation of DG...
This paper presents an overview of energy harvesting, and describes the methods used to generate electrical power from ambient or waste energy sources and includes; photovoltaic; thermoelectric; piezoelectric; pyroelectric; radio frequency (RF); electromagnetic induction; electrostatic; and capacitive methods. A brief description of the scientific principles, typical application, commercial success,...
On-board bi-directional chargers for electric vehicles (EV) are important elements of smart grid infrastructure enabling peak load shaving and grid frequency/voltage support. Conventional LLC resonant converter based on-board EV charger incurs large losses in reverse mode of operation and when operating frequency deviates from the resonant frequency which is often the case as battery voltage changes...
Distributed generation (DG) has gained popularity in recent years due to the increasing requirement for renewable power sources. A problem that exists with DG systems is the islanding of DG units that creates safety issues for personnel as well as the potential for damage to utility infrastructure. Therefore, islanding detection methods are utilized to mitigate the risk of islanded operation of DG...
Electric vehicles rely on efficient charging techniques to maximize battery performance, efficiency and lifetime. Most EV on-board chargers are supplied from single phase AC mains, and contain 2nd order mains frequency harmonic in the battery current. This harmonic current incurs extra loss in the battery, increases battery temperature, and hence reduces charging efficiency and battery lifetime. Conventional...
The main development trend of wind power generation systems is large offshore wind farms (OWFs) with grid connection. However offshore wind farms have grown rapidly due to much better wind conditions. Hence, several large scale offshore wind farms are planned to be built and installed at distances greater than 100 km from the coast. Traditionally, an AC collector scheme collects energy from the wind...
In order to provide stabilization of the utility power supply during peak-load times, the possibility for use of an Electric Vehicle's (EV) traction battery for energy buffering has been proposed, and an On-Board Bidirectional Charger is required to allow efficient battery charging regimes, whilst enabling power to be fed back to the grid pursuant to necessary standards. Here, an in-depth case-study...
The paper describes the application of a realtime, adaptive battery modelling methodology to Li-ion batteries. This methodology allows accurate estimation of the State-of-Function (SoF) of batteries for an Electric or Hybrid-Electric vehicle. Through use of a Kalman Estimator and online battery model parameter estimation, the voltages associated with monitoring the State of Charge (SoC) of the battery...
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