GESTÃO DE PERIGOS E RÍSCOS ELÉTRICOS-ENG.AGUINALDO BIZZO DE ALMEIDA-XII Electrical Safety Workshop – ESW Brasil-SÃO PAULO-7 A 9 OUTUBRO 2025

 

PSPICE SIMULATION SCHEMATIC DIAGRAM PFC UPS 2KVA ONLINE

 

SCHEMATIC PSPICE SIMULATION OF A HALF BRIDGE SINGLE PHASE DC-AC INVERTER USING PWM SWITCHING WITH NON LINEAR LOAD

 

ENERGIZEI CAST COM DOUTOR ELETRÔNICA DE POTÊNCIA (UFC)LUIS DANIEL BEZERRA PROFESSOR NO IFCE MARACANAU CEARÁ BRASIL

 

Analysis of Phase-Locked Loop Filter Delay on Transient Stability of Grid-Following Converters by Chenglin Zhang *,Junru Chen and Wenjia Si-The College of Electrical Engineering, Xinjiang University,

 Abstract 

To ensure precise phase estimation within the q-axis of the phase-locked loop (PLL), integrating a filter into the q-axis loop is essential to mitigate grid-voltage harmonics. Nevertheless, the intrinsic delay characteristics of this filter impede PLL synchronization during significant grid disturbances. This study begins by developing mathematical models for three types of filters—moving-average filter (MAF) for eliminating odd harmonic components, dq-frame cascaded delayed signal cancellation (dqCDSC) filter, and notch filter (NF). Following the reduction in filter orders, a third-order nonlinear large-signal model of the PLL, incorporating an additional q-axis internal filter, is formulated. Using phase plane analysis, this study investigates the transient synchronism of the grid-following converter (GFL) and explores the influence of delay time constants from the three PLL filters on its behavior while delineating the boundaries of their basins of attraction. Theoretical findings indicate that, relative to the traditional SRF-PLL, incorporating an internal filter into the PLL compromises the transient synchronous stability of GFL. Specifically, greater filter delay time constants exacerbate the GFL’s vulnerability to transient instability amid substantial grid disturbances. Hence, careful consideration is essential when using MAF-PLL and NF-PLL in situations demanding high synchronization stability. The theoretical analyses are validated using Matlab/Simulink to verify their accuracy.

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