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DC networks for Energy Efficiency and Renewable Additions

NRC Grant:  14-015

14 015a

Prof. J.B. Ekanayake
Dept. of Electrical and Electronic Eng.
Faculty of Engineering
University of Peradeniya
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Area of Research:  Electronics
Status:   Ongoing

 

objectives

a) To investigate the best way of incorporating dc networks with the existing ac networks and design and implement a suitable solid state transformer that can be used for such integration.

b) To investigate the possibility of using the existing ac distribution lines for distributing both ac and dc.

c) To investigate the suitable protection and earthing options for LV dc grids.

d) To design and implement a suitable energy router that can enable optimum use of the local PV generation and that can be used to supply a reliable and quality supply to local loads.

overview

According to the National Energy Policy of Sri Lanka (2008), the Government will endeavour to reach a minimum level of 10% of electrical energy supplied to the grid from Non-Conventional Renewable Energy (NCRE) sources by 2015. With an anticipated generation of 15238 GWh in 2015, this reflects to about 1523.8 GWh from NCRE sources. By the end of 2012, we were only producing 122 GWh from NCRE sources. In order to achieve the Government targets, we should allow connection of more renewables in all the levels of our power system. In this proposal, an effective way of connecting Photovoltaic (PV) systems at the load end of the power system is considered. At present many conversion stages are involved as dc power generated in PV has to be converted to ac and as many loads consume electricity as dc, ac power need to be then converted back to dc. Therefore, in this research how dc grids could be formed in the form of dc MicroGrids, low and medium voltage dc lines and home/commercial dc supplies will be investigated. The proposed connection will allow more and more PV to be connected to our power system thus helping to achieve country's renewable targets Also, the proposed system will increase the efficiency of our power system thus reducing the cost of generation and will increase the quality, security and reliability of the power supply as power is generated closer to the load centres. As this technology is novel, we could be at the forefront of this technology.