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http://dx.doi.org/10.6113/JPE.2014.14.5.1057

A Canonical Small-Signal Linearized Model and a Performance Evaluation of the SRF-PLL in Three Phase Grid Inverter System  

Mao, Peng (School of Information and Electronics, Beijing Institute of Technology)
Zhang, Mao (School of Information and Electronics, Beijing Institute of Technology)
Zhang, Weiping (School of Information Engineering, North China University of Technology)
Publication Information
Journal of Power Electronics / v.14, no.5, 2014 , pp. 1057-1068 More about this Journal
Abstract
Phase-locked loops (PLL) based on the synchronous reference frame (SRF-PLL) have recently become the most widely-used for grid synchronization in three phase grid-connected inverters. However, it is difficult to study their performance since they are nonlinear systems. To estimate the performances of a SRF-PLL, a canonical small-signal linearized model has been developed in this paper. Based on the proposed model, several significant specifications of a SRF-PLL, such as the capture time, capture rang, bandwidth, the product of capture time and bandwidth, and steady-state error have been investigated. Finally, a noise model of a SRF-PLL has been put forward to analyze the noise rejection ability by computing the SNR (signal-to-noise ratio) of a SRF-PLL. Several simulation and experimental results have been provided to verify and validate the obtained conclusions. Although the proposed model and analysis method are based on a SRF-PLL, they are also suitable for analyzing other types of PLLs.
Keywords
Noise model; Noise rejection ability; Performance evaluation; Small-signal linearized model; SRF-PLL;
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