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Phase-locked loop for grid-connected three-phase power conversion systems

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1 Author(s)
S. -K. Chung ; Dept. of Control & Instrum. Eng., Gyeongsang Nat. Univ., Kyungnam, South Korea

Analysis and design of a phase-locked loop (PLL) is presented for the power factor control of grid-connected three-phase power conversion systems. The dynamic characteristics of the closed loop PLL system with a second order are investigated in both continuous and discrete-time domains, and the optimisation method is discussed. In particular, the performance of the PLL in the three-phase system is analysed under the distorted utility conditions such as the phase unbalancing harmonics, and offset caused by nonlinear loads and measurement errors. The PLL technique for the three-phase system is implemented in software of a digital signal processor to verify the analytic results, and the experiments are carried out for various utility conditions. This technique is finally applied to the grid-connected photovoltaic power generation system with the current-controlled PWM inverter as a subpart for generating the current reference of the inverter. The experimental results demonstrate its phase tracking capability in the three-phase grid-connected operation

Published in:

IEE Proceedings - Electric Power Applications  (Volume:147 ,  Issue: 3 )