DocumentCode :
2194382
Title :
A practical solution for grid connected dispersed generation from renewable sources: DC connection
Author :
Magureanu, R. ; Albu, Mihaela ; Dumitrescu, Ana-Maria ; Priboianu, M.
Author_Institution :
Bucharest Politehnica Univ.
fYear :
2006
fDate :
23-26 May 2006
Firstpage :
1228
Lastpage :
1231
Abstract :
The exploitation of renewable sources is expected to become the most promising solution to the environmental issues and to the permanent increase of prices of the fossil energy. Since most of renewable energy sources are widely distributed and the energy converters generally do not provide electric power at main grid frequency and voltage, a DC bus is suggested to be used for integrating them into a DC grid and further transfer it into an AC grid (usually available at a certain distance). Due to differences among the technical parameters of the power supply equipment, their outputs have to be firstly conditioned and then connected in parallel to a DC bus via appropriate power electronics. The aim of this paper is to suggest practical solutions for RES integration into distribution networks. The proposed DC link is simulated and different methods for load sharing and droop control is discussed. The standard model is a 6 kV, 1 MW electrical hydro generator with six phases YDelta connected, and having the output rectified by six phase diodes and paralleled to a 10 kV DC cable underground line. Three levels DC-AC, front-end bi-directional converters are used as interface with the AC grid. The connection of the low voltage grid (connecting the output of different power sources) to the medium voltage DC link is done by means of a DC-DC quasi-resonant converter provided with an internal high frequency insulation transformer. For the further connection of the DC link to the medium voltage AC distribution grid a solution employing IGBT four legs, front-end converter is proposed. A low voltage DC grid model, in the tens of kW range, 400/230 V AC - 720/320 V DC is under commissioning
Keywords :
DC-AC power convertors; DC-DC power convertors; distributed power generation; hydroelectric generators; power grids; power system interconnection; resonant power convertors; underground distribution systems; 1 MW; 6 kV; AC grid; DC grid; DC-AC front-end bidirectional converters; DC-DC quasiresonant converter; distribution networks; droop control; electrical hydro generator; fossil energy; grid connected dispersed generation; high frequency insulation transformer; load sharing; low voltage grid; medium voltage DC link; power electronics; renewable energy sources; six phase diodes; Analog-digital conversion; DC generators; Frequency conversion; Low voltage; Medium voltage; Mesh generation; Power supplies; Power systems; Power transformer insulation; Renewable energy resources;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Power Electronics, Electrical Drives, Automation and Motion, 2006. SPEEDAM 2006. International Symposium on
Conference_Location :
Taormina
Print_ISBN :
1-4244-0193-3
Type :
conf
DOI :
10.1109/SPEEDAM.2006.1649955
Filename :
1649955
Link To Document :
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