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Enhanced Dynamic Response of SRF-PLL System in a 3 Phase Grid-Connected Inverter  

Choi, Hyeong-Jin (광운대 전기공학과)
Song, Seung-Ho (광운대 전기공학과)
Jeong, Seung-Gi (광운대 전기공학과)
Choi, Ju-Yeop (광운대 전기공학과)
Choy, Ick (광운대 정보제어공학과)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.14, no.2, 2009 , pp. 134-141 More about this Journal
Abstract
The new method is proposed to improve the dynamics of the phase angle detector during abrupt voltage dip caused by a grid fault. Usually, LPF(low pass filter) is used in the feedback loop of SRF(Synchronous Reference Frame) - PLL (Phase Locked Loop) system because the measured grid voltage contains harmonic distortions and sensor noises. A better transient response can be obtained with the proposed design method for SRF-PLL by the analysis of linearized model of the PLL system including LPF. Furthermore, in the proposed method, the controller gain and LPF cut-off frequency are changed from normal value to transient value when the voltage disturbance is detected. This paper shows the feasibility and the usefulness of the proposed methods through the computer simulation and the experiment.
Keywords
Phase locked loop; Grid fault; Dynamic response; Controller design; Low-pass filter;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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