TITLE:
Design Analysis of DC-DC Converters Connected to a Photovoltaic Generator and Controlled by MPPT for Optimal Energy Transfer throughout a Clear Day
AUTHORS:
S. Kolsi, H. Samet, M. Ben Amar
KEYWORDS:
DC-DC Converter; Energy Efficiency; Design; Load Matching; MPPT
JOURNAL NAME:
Journal of Power and Energy Engineering,
Vol.2 No.1,
January
20,
2014
ABSTRACT: The DC-DC
converters are widely used in photovoltaic generating systems as an interface
between PV module and the load. These converters must be chosen to be able to
match the maximum power point (MPP) of PV module when climatic conditions
change with different resistive load values. So DC-DC converters must be used
with MPPT controller in order to reduce losses in the global PV system. This
article focuses on the effect of climatic conditions on design of two
components (inductance, capacitance) for three topologies of DC-DC converters
commonly used in PV systems. When climatic conditions change, the boundary of
inductance and capacitance parameters of DC-DC converter will change. These two
parameters must be properly sized to achieve optimal efficiency for each
converter. The design optimization is based on two principles: 1) for a
steady-state operation in a continuous conduction mode, the inductance value
for all choppers must be greater than the maximum value of boundary inductance, and 2) in order to limit the output voltage ripple of
DC-DC converter below a desired value, the filter capacitance must be larger
than the maximum value of boundary capacitance.