PhD programme
by Haoran Zhao
Study no s114656
Period
October 2011 to October 2014
Supervisors
Associate Professor, Claus Nygaard Rasmussen
CET, DTU Electrical Engineering
Assistant Professor, Qiuwei Wu
CET, DTU Electrical Engineering
Cooperation partner
SDC - The Sino-Danish Center for Education and Research
Description
Wind power is one of the most popular renewable energy solutions for the future. According to the statistic, wind power is growing at the rate of 30% annually, with a worldwide installed capacity of 198 GW in 2010. Because of its stochastic characteristics, wind power is constantly fluctuating and this can result in power system instability if large amounts of wind power are directly integrated into the grid. One method to smooth the energy inflow is to incorporating energy storage devices into modern Wind Power Plants (WPPs). But judging from the relatively high cost of existing storage mediums (usually batteries) this does not seem to be a very economical solution. Therefore, instead of solely relying on storage mediums, an alternative coordinated control approach is proposed, which can either be adopted as a standalone solution or complementing energy storage to form a more robust and cost-effective solution.
In brief, the proposed approach recognizes the growing expansion of renewable energy with a number of large-scale WPPs expected to be dispersed throughout the grid. Coordinated control between them to make appropriate usages of their individual merits, attributed by their technical characteristic features as well as geographical and climatic conditions, is therefore a possibility that currently has not been addressed thoroughly, and is now recommended for investigation.
The object of this control framework is to coordinate the operation of WPPs and energy storage systems to reduce the fluctuation of wind power production and utilize the reactive power capabilities of wind power plants to improve voltage stability of the whole system.
2011 December, hz
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