Abstract
In this study a power converter to process renewable energy is proposed, which can not only process solar energy but deal with wind power. The proposed converter is derived from two series modified forwards to step down voltage for charger system or dc distribution application, so as called Modified-Forward Dual-Input Converter (MFDIC). The MFDIC mainly contains an upper Modified Forward (MF), a lower MF, a common output inductor and a DSP-based system controller. The upper and lower MFs can operate individually or simultaneously to accommodate the variation of atmospheric conditions. Since the MFDIC can process renewable power with interleaved operation, the ripple of output current is suppressed significantly and thus better performance is achieved. In the MFDIC only a common output inductor is needed, instead of two separated inductors, so that the volume of the converter is reduced significantly. To draw maximum power from PV panel and wind turbine, perturb-and-observe method is adopted to achieve the feature of Maximum Power Point Tracking (MPPT). The MFDIC is constructed, designed, analyzed, simulated and tested. Simulations and practical measurements have demonstrated the validity and the feasibility of the proposed dual-input converter.
Highlights
With rapid development of industry and commerce, requirement for electricity has been growing dramatically
Adopting renewable and clean energy resources to replace fossil fuels for electric power generation is a research of great urgency
System architecture: A block diagram to illustrate a PV-wind power generation system is shown in Fig. 1, which mainly contains a PV panel, a wind turbine, a multi-input converter and a system controller
Summary
With rapid development of industry and commerce, requirement for electricity has been growing dramatically. In literature (Wai and Wang, 2008; Gules et al, 2008; Vazquez et al, 2008; Lohmeier et al, 2011; Shen and Chau, 2012) PV converters are presented while wind power converters are discussed in Yazdani and Iravani (2006) and Ullah and Thiringer (2007) These power converters only handle single kind of renewable energy, that is, which cannot deal with multi-input power. Some researchers propose multi-input converters for solar/wind hybrid power generation system (Sedaghati and Babaei, 2011; Cacciato et al, 2008; Fang and Ma, 2010) Even though these multi-input converters can process hybrid renewable energy, two separated converters in series or in parallel are required.
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