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The principle and characteristics of present EES technologies are reviewed. The potential applications of different roles played by EES are described. The recent researches about the EES planning problems, including type selection, optimal sizing and siting are summarized. The operation and control strategies are discussed. a b s t r a c t With the rapid(More)
In this paper, modeling of parallel three-phase converters is first presented. Then definition of the circulating currents of paralleled converters and the circulating-current-generating mechanism are clearly explained. Thus, based on this definition, an averaged model of the circulating current is proposed. It is seen from this model that the circulating(More)
Wireless communication in the 60GHz millimeter wave (mm-wave) communications is getting increasing attention as a promising candidate for gigabits per second (Gbps) wireless communication networks. Although multi-Gbps throughput is supported and a very large block of unlicensed spectrum is available worldwide in the 60GHz band, some technical challenges(More)
This paper presents a fast coordinated control scheme of the rotor side converter (RSC), the Direct Current (DC) chopper and the grid side converter (GSC) of doubly fed induction generator (DFIG) wind turbine generators (WTGs) to improve the low voltage ride through (LVRT) and high voltage ride through (HVRT) capability of the DFIG WTGs. The characteristics(More)
Mobile learning (m-learning) is a new field of distance learning. It is combined with mobile communication technology, mobile computing technology, network technology and modern education. L-learning system is the realization of the implementation of m-learning methods and platforms. It is the most intuitive approach for learners and its experience directly(More)
Under the situation of m-learning, mobile learners can't be aware of other collaborative learners' information and can't effectively communicate with them due to small screens of mobile devices, small storage and the limitation of data-processing ability. In this paper, the author puts forwards a middleware structure based on multi-agent system in order to(More)
Due to the double fed induction generator’s (DFIG) advantage of controlling active and reactive power independently and partial power converter, DFIG is becoming a popular type of wind power generation system. Nowadays, the grid code demands that the wind power generator possesses the ability of riding through the grid voltage sags, only when the(More)
This paper made exploring the root causes of china's virtual-high medicine price as a starting point, and the retail market price of new exclusive production drugs as the research object. Based on the search theory in information economics, through establishing the search model of drug price, this paper derived that the new drug prices mainly affected by(More)