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http://dx.doi.org/10.6113/JPE.2016.16.5.1904

Performance Evaluations of Four MAF-Based PLL Algorithms for Grid-Synchronization of Three-Phase Grid-Connected PWM Inverters and DGs  

Han, Yang (Department of Power Electronics, School of Mechatronics Engineering, University of Electronic Science and Technology of China)
Luo, Mingyu (Department of Power Electronics, School of Mechatronics Engineering, University of Electronic Science and Technology of China)
Chen, Changqing (Panzhihua Power Supply Company, State Grid Sichuan Electric Power Company)
Jiang, Aiting (Department of Power Electronics, School of Mechatronics Engineering, University of Electronic Science and Technology of China)
Zhao, Xin (Department of Energy Technology, Aalborg University)
Guerrero, Josep M. (Department of Energy Technology, Aalborg University)
Publication Information
Journal of Power Electronics / v.16, no.5, 2016 , pp. 1904-1917 More about this Journal
Abstract
The moving average filter (MAF) is widely utilized to improve the disturbance rejection capability of phase-locked loops (PLLs). This is of vital significance for the grid-integration and stable operation of power electronic converters to electric power systems. However, the open-loop bandwidth is drastically reduced after incorporating a MAF into the PLL structure, which makes the dynamic response sluggish. To overcome this shortcoming, some new techniques have recently been proposed to improve the transient response of MAF-based PLLs. In this paper, a comprehensive performance comparison of advanced MAF-based PLL algorithms is presented. This comparison includes HPLL, MPLC-PLL, QT1-PLL, and DMAF-PLL. Various disturbances, such as grid voltage sag, voltage flicker, harmonics distortion, phase-angle and frequency jumps, DC offsets and noise, are considered to experimentally test the dynamic performances of these PLL algorithms. Finally, an improved positive sequence extraction method for a HPLL under the frequency jumps scenario is presented to compensate for the steady-state error caused by non-frequency adaptive DSC, and a satisfactory performance has been achieved.
Keywords
Grid-synchronization; Moving average filter (MAF); Phase-locked loop (PLL); Transient response;
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