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A Method to Improve PLL Performance Under Abnormal Grid Conditions
Anirban Ghoshal,Vinod John +1 more
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TLDR
In this paper, a method to obtain accurate phase information when the grid voltages are unbalanced by adding a moving average filter to a synchronous reference frame (SRF) PLL has been proposed.Abstract:
Phase tracking system or phase locked loop (PLL) is an important part of the control unit of a grid connected power converter. Popular methods such as zero crossing detection (ZCD) and synchronous reference frame (SRF) PLL do not produce accurate phase information when grid is non-ideal. In this work a method to obtain accurate phase information when the grid voltages are unbalanced by adding a moving average filter to a SRF PLL has been proposed. The performances of the PLL have been experimentally verified for abnormal grid conditions such as unbalance, harmonics, voltage sag and swell, faults etc. Generally, during a fault phase voltages become unbalanced so this method can give better fault ride through capability to a power converter.read more
Citations
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Journal ArticleDOI
Three-Phase PLLs: A Review of Recent Advances
TL;DR: A phase-locked loop (PLL) is a nonlinear negative feedback control system that synchronizes its output in frequency as well as in phase with its input PLLs are now widely used for the synchronization of power-electronics-based converters and also for monitoring and control purposes in different engineering fields as mentioned in this paper.
Journal ArticleDOI
Moving Average Filter Based Phase-Locked Loops: Performance Analysis and Design Guidelines
TL;DR: The paper presents two systematic methods to design the control parameters of a typical MAF-based PLL: one for the case of using a proportional-integral (PI) type loop filter (LF) in the PLL, and the other for the cases of using an proportional-Integral-derivative (PID) type LF.
Journal ArticleDOI
Variable-Frequency Grid-Sequence Detector Based on a Quasi-Ideal Low-Pass Filter Stage and a Phase-Locked Loop
TL;DR: In this paper, a filtered-sequence phase-locked loop (FSPLL) structure is proposed for detection of the positive sequence in three-phase systems, which includes the use of the Park transformation and moving average filters.
Journal ArticleDOI
A Method to Improve the Dynamic Performance of Moving Average Filter-Based PLL
TL;DR: In this paper, the authors proposed a differential MAF-PLL (DMAF)-PLL, which is realized by incorporating a special proportional component into the moving average filter (MAF) based PLL.
Journal ArticleDOI
Grid-Synchronization Stability Analysis and Loop Shaping for PLL-Based Power Converters With Different Reactive Power Control
TL;DR: A single-input–single-output model is developed to explicitly reveal how the PLL interacts with the other parts of the converter system in terms of grid synchronization and demonstrates how the loop shaping of PLL takes effect in increasing the stability margin and eventually preventing the converter from GSI.
References
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Journal ArticleDOI
Decoupled Double Synchronous Reference Frame PLL for Power Converters Control
TL;DR: In this article, a decoupled double synchronous reference frame phase-locked loop (DDSRF-PLL) was proposed to detect the fundamental-frequency positive-sequence component of the utility voltage under unbalanced and distorted conditions.
Journal ArticleDOI
A phase tracking system for three phase utility interface inverters
TL;DR: In this article, the phase tracking system of the three phase utility interface inverters is investigated in both continuous and discrete-time domains, and the optimization method is considered for the second order PLL system.
Journal ArticleDOI
Operation of a phase locked loop system under distorted utility conditions
TL;DR: In this article, a phase-locked loop (PLL) system under distorted utility conditions is presented and a control model of the PLL system is developed and recommendations are made on tuning of this model specially for operation under common utility distortions such as line notching, voltage unbalance/loss, and frequency variations.
Proceedings ArticleDOI
PLL structures for utility connected systems
TL;DR: In this paper, a detailed analysis of phase-locked loop structures for utility connected systems is presented, and a single-phase PLL structure derived from the three-phase topology is discussed and its behavior under distorted utility conditions is analyzed.
Proceedings ArticleDOI
Synchronization methods for three phase distributed power generation systems - An overview and evaluation
TL;DR: Simulation and experimental results are used to evaluate the behavior of the synchronization methods under different kind of grid disturbances such as voltage dips, harmonics and notches.