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A novel digital phase-locked-loop for single-phase grid-connected power generation systems

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5 Author(s)
Qi Zhang ; Xi''an Univ. of Technol., Xi''an, China ; Xiangdong Sun ; Yanru Zhong ; Matsui, M.
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A novel digital phase-locked-loop (DPLL) method is proposed for single-phase grid-connected power generation systems in this paper. It consists of a grid voltage feed-forward network and a fictious instantaneous power feedback correction network. The fundamental signal of the grid voltage is extracted by a digital Butterworth filter to generate a unity sine reference signal for the feed-forward network, while only the signs of fictious instantaneous active and reactive powers are used to revise the phase shift of the unity sine reference signal by means of a real-time variable step-size control in the feedback phase correction network. The method is validated to have good dynamic and static performances through MATLAB simulations and experiments with a grid-connected photovoltaic (PV) power generation system under different conditions.

Published in:

Power Electronics Conference (IPEC), 2010 International

Date of Conference:

21-24 June 2010