TY - JOUR
T1 - Continuous-input continuous-output current buck-boost DC/DC converters for renewable energy applications
T2 - modelling and performance assessment
AU - Zakzouk, Nahla E.
AU - Khamis, Ahmed K.
AU - Abdelsalam, Ahmed K.
AU - Williams, Barry W.
PY - 2019/6/10
Y1 - 2019/6/10
N2 - Stand-alone/grid connected renewable energy systems (RESs) require direct current (DC)/DC converters with continuous-input continuous-output current capabilities as maximum power point tracking (MPPT) converters. The continuous-input current feature minimizes the extracted power ripples while the continuous-output current offers non-pulsating power to the storage batteries/DC-link. CUK, D1 and D2 DC/DC converters are highly competitive candidates for this task especially because they share similar low-component count and functionality. Although these converters are of high resemblance, their performance assessment has not been previously compared. In this paper, a detailed comparison between the previously mentioned converters is carried out as several aspects should be addressed, mainly the converter tracking efficiency, conversion efficiency, inductor loss, system modelling, transient and steady-state performance. First, average model and dynamic analysis of the three converters are derived. Then, D1 and D2 small signal analysis in voltage-fed-mode is originated and compared to that of CUK in order to address the nature of converters' response to small system changes. Finally, the effect of converters’ inductance variation on their performance is studied using rigorous simulation and experimental implementation under varying operating conditions. The assessment finally revels that D1 converter achieves the best overall efficiency with minimal inductor value.
AB - Stand-alone/grid connected renewable energy systems (RESs) require direct current (DC)/DC converters with continuous-input continuous-output current capabilities as maximum power point tracking (MPPT) converters. The continuous-input current feature minimizes the extracted power ripples while the continuous-output current offers non-pulsating power to the storage batteries/DC-link. CUK, D1 and D2 DC/DC converters are highly competitive candidates for this task especially because they share similar low-component count and functionality. Although these converters are of high resemblance, their performance assessment has not been previously compared. In this paper, a detailed comparison between the previously mentioned converters is carried out as several aspects should be addressed, mainly the converter tracking efficiency, conversion efficiency, inductor loss, system modelling, transient and steady-state performance. First, average model and dynamic analysis of the three converters are derived. Then, D1 and D2 small signal analysis in voltage-fed-mode is originated and compared to that of CUK in order to address the nature of converters' response to small system changes. Finally, the effect of converters’ inductance variation on their performance is studied using rigorous simulation and experimental implementation under varying operating conditions. The assessment finally revels that D1 converter achieves the best overall efficiency with minimal inductor value.
KW - buck-boost
KW - continuous-input current
KW - continuous-output current
KW - DC/DC converters
KW - dynamic modelling
KW - MPPT
KW - photovoltaic
KW - renewable energy system
KW - small-signal analysis
UR - http://www.scopus.com/inward/record.url?scp=85067264818&partnerID=8YFLogxK
U2 - 10.3390/en12112208
DO - 10.3390/en12112208
M3 - Article
AN - SCOPUS:85067264818
VL - 12
JO - Energies
JF - Energies
SN - 1996-1073
IS - 11
M1 - 2208
ER -