期刊名称：International Journal of Innovative Research in Science, Engineering and Technology
印刷版ISSN：2347-6710
电子版ISSN：2319-8753
出版年度：2014
期号：ICIET
页码：11
出版社：S&S Publications
摘要：This paper represents a comparativeanalysis between conventional SRF-PLL, notch filterbased PLL and double decoupled SRF-PLL both underbalanced and unbalanced voltage conditions. Nature ofphase angle, angular frequency and positive and negativesequence voltage components for different techniques arestudied. It shows that conventional SRF-PLL techniquegives suitable response till balanced voltage conditionprevails. At the moment system became unbalanced SRFPLLresponse suffer from double frequency oscillationwhich makes it unreliable. Then notch filter based PLLtechnique is analysed. Here the unbalanced conditionresponse is improved but the system suffers formcomparatively large settling time. It also suffers fromovershoot and undershoot at transient period making theestimation rather critical at that point. Finally animproved SRF-PLL with decoupling network and lowpass filter is described called DDSRF-PLL. This methodseparates out the positive and negative sequencecomponents initially by means of decoupling networkthere by eliminates the double frequency vibration in theresponse. it also has faster convergence and smoothtransient response then that of notch filter based PLL thewhole simulation is done in matlab/ simulink and acomparative statement is established.
