DOI:https://doi.org/10.1007/s40565-018-0440-2 |
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An online maximum power point capturing technique for high-efficiency power generation of solar photovoltaic systems |
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Net amount: 1065 |
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Author:
Lijun ZHANG1, Samson Shenglong YU1, Tyrone FERNANDO1,
Herbert Ho-Ching IU1, Kit Po WONG1
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Author Affiliation:
1. Department of Electrical, Electronic and Computer
Engineering, University of Western Australia, 35 Stirling
Hwy, Perth 6009, Australia
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Foundation: |
This work was supported in part by Australian
Research Council (ARC) Discovery Project (No. DP170104426). |
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Abstract: |
This paper proposes a novel high-efficiency
generation technique for photovoltaic (PV) system, named
maximum power point capturing (MPPC) technique. This
is an aperiodic perturbation MPPC technique compared to
the conventional periodic perturbation maximum power
point tracking technique. Firstly, under a closed-loop circuit
and an open-loop circuit, the complete I–V curves and
P–V curves are defined. Secondly, the proposed MPPC
technique is based on the complete I–V curves and a
practical model of solar PV systems. The proposed method
realizes that maximum power point (MPP) is captured
online, and its control strategy is designed to set a steady
operating area around MPP. The duty cycle keeps constant
when the operating point is within the steady operating
area, i.e., aperiodic perturbation, and when the operating
point is outside the steady operating area, MPPC is triggered
to capture a new MPP with an updated steady
operating area. Simulation results demonstrate that no
oscillations exist in steady-state; dynamic performances are
improved; and only two perturbations are required to
capture the new MPP. Using the proposed MPPC method,
low voltage ride through and high voltage ride through can
be prevented. |
Keywords: |
Photovoltaic systems, Maximum power point
tracking (MPPT), Maximum power point capturing
(MPPC), Complete I–V curves |
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Online Time:2019/03/08 |
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