دانلود رایگان مقاله انگلیسی, تطبیق امپدانس در سیستم های فتوولتائیک با استفاده از مبدل های آبشاری افزاینده و کنترل مد لغزشی

Impedance Matching in Photovoltaic Systems Using Cascaded Boost Converters and Sliding-Mode Control

سال انتشار : 2015

نوع مقاله : IEEE JOURNALS & MAGAZINES

تعداد صفحات : 15

Abstract—Switching dc–dc converters are widely used to interface

the dc output of renewable energy resources with power distribution

systems in order to facilitate the use of energy at the

customer side. In the case of residential photovoltaic (PV) applications,

high conversion ratio is usually required, in order to adapt

the low output voltages of PV modules to a dc bus voltage, while

dealing with the appropriate impedance matching. In this paper, a

system connected to a PV panel consisting of two cascaded dc–dc

boost converters under sliding-mode control and working as lossfree

resistors is studied.The modeling, simulation, and design of the

system are addressed. First, an ideal reduced-order sliding-mode

dynamics model is derived from the full-order switchedmodel taking

into account the sliding constraints, the nonlinear characteristic

of the PV module, and the dynamics of the MPPT controller. For

this model, a design-oriented averaged model is obtained and its

dynamic behavior is analyzed showing that the system is asymptotically

globally stable. Moreover, the proposed system can achieve

a high conversion ratio with an efficiency close to 95% for a wide

range of working power. Numerical simulations and experimental

results corroborate the theoretical analysis and illustrate the

advantages of this architecture in PV systems.

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