Title :
A New Topology for Grid-Connected Photovoltaic System Using the Converter with Flat Efficiency Curve for All Load Range
Author :
Byung Duk Min ; Lee, JongPil ; Kim, Jong-Hyun ; Kim, Tae-Jin ; Yoo, Dong-Wook ; Won, Chung-Yeon ; Kim, Heung-Gun
Author_Institution :
Korea Electrotechnol. Res. Inst., Changwon
Abstract :
In this paper, new topology is proposed that can dramatically reduce the converter power rating and increase the efficiency of total PV system. Since the output voltage of PV module has very wide voltage range, in general, the DC/DC converter is used to get constant high DC voltage. According to analysis of PV characteristics, in proposed topology, only 20% power of total PV system power is needed for DC/DC converter. DC/DC converter used in proposed topology has flat efficiency curve at all load range and very high efficiency characteristics. The total system efficiency is the product of that of converter and that of inverter. In propose topology, because the converter efficiency curve is flat all load range, the total system efficiency at the low power range is dramatically improved. The proposed topology is implemented for 200 kW PCS system. This system has only three DC/DC converters with 20 kW power rating each other. It is only one-third of total system power. The experiment results show that the proposed topology has good performance.
Keywords :
DC-DC power convertors; photovoltaic power systems; power grids; DC-DC converter; converter power rating; flat efficiency curve converter; grid-connected photovoltaic system; power 20 kW; power 200 kW; DC-DC power converters; Filters; Frequency; Inverters; Mesh generation; Personal communication networks; Photovoltaic systems; Power generation; Topology; Voltage;
Conference_Titel :
Power Electronics Specialists Conference, 2007. PESC 2007. IEEE
Conference_Location :
Orlando, FL
Print_ISBN :
978-1-4244-0654-8
Electronic_ISBN :
0275-9306
DOI :
10.1109/PESC.2007.4342172