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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...
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...
In order to improve the control performance of DC/DC boost converters, a current-mode controller is designed using backstepping method. This controller consists of two parts, one is the proportional control of the inductor current to stabilize the controlled system, the other is the proportional and integral control of the capacitor voltage to track the desired output. This controller not only can...
In order to overcome the drawbacks of apriori algorithm for mining frequent itemsets, TIMV (Three-dimensional Itemsets Matrix and Vectors) algorithm was proposed, which used three -dimensional itemsets matrix and vectors, and broke through the bottom-up framework of Apriori. Only needed one pass to scan the database and did not create candidate itemsets, we could gain all the frequent itemsets. Furthermore,...
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