DocumentCode :
2358215
Title :
A modified modulation control of a single-phase inverter with enhanced power decoupling for a photovoltaic AC module
Author :
Hirao, Takashi ; Shimizu, Toshihisa ; Ishikawa, Mutsuo ; Yasui, Kiyoto
Author_Institution :
Dept. of Electr. Eng., Tokyo Metropolitan Univ.
fYear :
2005
fDate :
11-14 Sept. 2005
Abstract :
A photovoltaic AC module system has been expected to be installed on the private residences. The AC module inverter needs an active power decoupling circuit in order to enlarge the lifetime and to decrease the volume of the inverter by eliminating a large electrolytic capacitor on the input DC-bus. This paper proposes novel flyback-type single-phase grid interactive inverters with two modulation methods, sequential magnetizing modulation (SMM) method and time-shared magnetizing modulation (TMM) method, and discuss those of the operation characteristics and the conversion efficiency. It is verified that the TMM method has advantage with respect to the conversion efficiency while the SMM method causes results in low conversion efficiency. However, current distortion of AC output remains on the TMM method due to the turn-on/off delay on the switching device. The influence of the turn-on/off delay upon the current waveform distortion is analyzed and a delay time compensation is proposed. Since the proposed compensation method achieves low distortion waveform and high conversion efficiency as well, it is concluded that the proposed inverter is one of the optimal method for the AC module systems
Keywords :
electrolytic capacitors; invertors; photovoltaic power systems; power grids; AC module inverter; active power decoupling circuit; current waveform distortion; delay time compensation; electrolytic capacitor; flyback-type single-phase grid interactive inverters; modulation control; photovoltaic AC module system; power decoupling; sequential magnetizing modulation method; time-shared magnetizing modulation method; Capacitors; Circuits; Control systems; Delay effects; Inverters; Magnetic modulators; Photovoltaic systems; Power generation; Renewable energy resources; Solar power generation; Converter circuit; Converter control; Efficiency; Photovoltaic; Renewable energy systems;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Power Electronics and Applications, 2005 European Conference on
Conference_Location :
Dresden
Print_ISBN :
90-75815-09-3
Type :
conf
DOI :
10.1109/EPE.2005.219387
Filename :
1665577
Link To Document :
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