Title :
A modular photo-voltaic grid-connected inverter based on phase-shifted-carrier technique
Author :
Wang, Xuanyuan ; Kazerani, Mehrdad
Author_Institution :
Waterloo Univ., Ont., Canada
Abstract :
Residential photovoltaic grid-connected inverters are modular distributed power generation devices that convert the DC power from the roof-top solar panels to high-quality AC power at the utility grid interface. In this paper, the phase-shifted-carrier technique, which is normally used in high power multi-converter schemes, is applied to a modular grid-connected inverter to improve the output current waveform. First, it is shown, through analysis and simulation, that in the commonly-used photovoltaic grid-connected inverter topology, based on the phase-shift modulated full-bridge converter, the well-known rule of the phase-shift between the carrier signals of the adjacent modules is not valid for both odd and even number of modules. Then, a new general rule for the phase-shift is proposed, and finally, the validity of the proposed rule and its effect on the improvement of the quality of the output current waveform are verified through simulation.
Keywords :
DC-AC power convertors; bridge circuits; invertors; photovoltaic power systems; solar cell arrays; switching circuits; building-integrated PV power systems; distributed power generation; output current waveform improvement; phase-shift modulated full-bridge converter; phase-shift rule; phase-shifted-carrier technique; photovoltaic grid-connected inverter; roof-top solar panels; Circuit faults; Distributed power generation; Inductors; Inverters; Phase modulation; Photovoltaic systems; Pulse transformers; Solar power generation; Space vector pulse width modulation; Voltage;
Conference_Titel :
Industry Applications Conference, 2002. 37th IAS Annual Meeting. Conference Record of the
Conference_Location :
Pittsburgh, PA, USA
Print_ISBN :
0-7803-7420-7
DOI :
10.1109/IAS.2002.1042800