In recent years, there has been lots of emphasis put on the development of renewableenergy. While considerable improvement on renewable energy has been made,there are some inherent limitations for these renewable energies. For example, forsolar and wind power, there is an intermittent nature. For the fuel cell, the dynamicsof electro-chemical reaction is quite slow compared to the electric load. This willnot be acceptable for modern electric application, which requires constant voltage ofconstant frequency.This work proposed and evaluated a new power circuit that can deal with theproblem of the intermittent nature and slow response of the renewable energy.The proposed circuit integrates different renewable energy sources as well asenergy storage. By integrating renewable energy sources with statistical tendency tocompensate each other, the effect of the intermittent nature can be greatly reduced.This integration will increase the reliability and utilization of the overall system.Moreover, the integration of energy storage solves the problem of the slow responseof renewable energy. It can provide the extra energy required by load or absorb theexcessive energy provided by the energy sources, greatly improving the dynamics ofoverall system.To better understand the proposed circuit, "Dual Active Bridge" and "TripleActive Bridge" were reviewed first. The operation principles and the modeling were presented. Analysis and design of the overall system were discussed. Controllerdesign and stability issues were investigated. Furthermore, the function of the centralcontroller was explained. In the end, different simulations were made and discussed.Results from the simulations showed that the proposed multi-port DC-DC powerconverter had satisfactory performance under different scenarios encountered in practicalrenewable energy application. The proposed circuit is an effective solution to theproblem due to the intermittent nature and slow response of the renewable energy.
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