Phase-Locked Loop Using Complex-Coefficient Filters for Grid-Connected Inverter

SUMMARY Recently, photovoltaic (PV) power systems have attracted considerable attention in attempts to mitigate global warming. In a PV power system, it is necessary to synchronize the grid voltage when a PV inverter is interconnected with a grid. This paper proposes a high‐speed and high‐precision...

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Bibliographic Details
Published in:Electrical engineering in Japan 2014-12, Vol.189 (4), p.52-60
Main Authors: Ohori, Akihiro, Hattori, Nobuyuki, Funaki, Tsuyoshi
Format: Article
Language:English
Subjects:
complex-coefficient filter
grid-connected inverter
phase-locked loop
photovoltaic power system
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Summary:SUMMARY Recently, photovoltaic (PV) power systems have attracted considerable attention in attempts to mitigate global warming. In a PV power system, it is necessary to synchronize the grid voltage when a PV inverter is interconnected with a grid. This paper proposes a high‐speed and high‐precision phase‐locked loop (PLL) using complex‐coefficient filters for a single‐phase grid‐connected inverter. The proposed PLL can detect the phase of grid voltage that has superimposed harmonic components for grid fault. Moreover, numerical results show the effectiveness of the proposed method.
ISSN:0424-7760
1520-6416
DOI:10.1002/eej.22595