A New DC Anti-Islanding Technique of Electrolytic Capacitor-Less Photovoltaic Interface in DC Distribution Systems
Abstract—This
paper proposes a photovoltaic (PV) generation system interfaced with a dc
distribution system. DC interface allows for the improvement of system
efficiency by fully utilizing dc-based renewable sources and storage devices.
In this paper,issues on PV interface for dc distribution systems are discussed
for energy-efficient and reliable system implementation. AC and dc PV
interfaces are mathematically analyzed. In dc distribution, eliminating
electrolytic capacitors in PV interfaces improves system reliability, increases
system efficiency, and reduces cost. In addition, this paper proposes a new
anti-islanding technique for dc distribution as a system protection scheme. The
operating principle is presented in detail and analysis shows that the proposed
injected current perturbation technique is an effective solution for
anti-islanding operation. A prototype converter features a simple structure
with no electrolytic capacitor, which ensures a longer lifetime of the PV power
circuit. Experimental results of the prototype circuit show a maximum
efficiency of 98.1% and a European efficiency of 97.5%. The proposed
anti-islanding technique shows fast response to the islanding condition in less
than 0.2 s. It also shows that the average maximum power point tracking
efficiency is 99.9% in normal conditions, which verifies the performance of the
proposed scheme.
(Index Terms—Anti-islanding, building integrated
photovoltaic (BIPV), dc distribution, islanding, photovoltaic (PV).)
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