Journal ArticleDOI
Three-Phase Cascaded Delayed Signal Cancellation PLL for Fast Selective Harmonic Detection
Yi Fei Wang,Yun Wei Li +1 more
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TLDR
A selective harmonic detection system based on the three-phase cascaded delayed signal cancellation phase-locked loop that can be flexibly configured to detect any individual harmonic from the source with various background harmonics and offers excellent adaptability under small and considerable frequency variations.Abstract:
Fast and accurate selective harmonic detection has crucial value for many power system harmonic compensation systems. The existing detection methods are known to have a few drawbacks, such as long delay time, sensitivity to grid frequency variation, and difficulty to achieve zero steady-state error. In order to overcome these drawbacks, this paper proposes a selective harmonic detection system based on the three-phase cascaded delayed signal cancellation phase-locked loop. The system can be flexibly configured to detect any individual harmonic from the source with various background harmonics. It also features very short transient and excellent adaptability under small and considerable frequency variations, as verified by comprehensive experimental results. Finally, this paper provides guidance on how to tailor the detection system for different applications and a solution to address the practical implementation issues.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
An Enhanced Islanding Microgrid Reactive Power, Imbalance Power, and Harmonic Power Sharing Scheme
TL;DR: In this article, an online virtual impedance adjustment is proposed to address inaccurate power sharing problems in autonomous islanding microgrids, where a term associated with DG reactive power, imbalance power, or harmonic power is added to the conventional real power-frequency droop control to realize DG series virtual impedance tuning.
Journal ArticleDOI
A Novel Grid Synchronization PLL Method Based on Adaptive Low-Pass Notch Filter for Grid-Connected PCS
TL;DR: This paper proposes a novel low-pass notch filter PLL (LPN-PLL) control strategy to synchronize with the true phase angle of the grid instead of using a conventional synchronous reference frame PLL, which requires a d-q-axis transformation of three-phase voltage and a proportional-integral controller.
Journal ArticleDOI
Active Harmonic Filtering Using Current-Controlled, Grid-Connected DG Units With Closed-Loop Power Control
TL;DR: In this paper, an enhanced current control approach, which seamlessly integrates system harmonic mitigation capabilities with the primary DG power generation function is proposed, which effectively eliminates the impacts of steady-state fundamental current tracking errors in the DG units.
Journal ArticleDOI
Conventional Synchronous Reference Frame Phase-Locked Loop is an Adaptive Complex Filter
Saeed Golestan,Josep M. Guerrero +1 more
TL;DR: This paper shows that the conventional SRF-PLL is a first-order adaptive complex bandpass filter and the accuracy of this transfer function is confirmed through numerical results.
References
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Journal ArticleDOI
Overview of Control and Grid Synchronization for Distributed Power Generation Systems
TL;DR: An overview of the structures for the DPGS based on fuel cell, photovoltaic, and wind turbines is given and the possibility of compensation for low-order harmonics is discussed.
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
A New Single-Phase PLL Structure Based on Second Order Generalized Integrator
TL;DR: In this article, a phase-locked-loop (PLL) method for single-phase systems was proposed to detect the phase angle, amplitude and frequency of the utility voltage.
Journal ArticleDOI
Multiresonant Frequency-Locked Loop for Grid Synchronization of Power Converters Under Distorted Grid Conditions
TL;DR: A new multiresonant frequency-adaptive synchronization method for grid-connected power converters that allows estimating not only the positive- and negative-sequence components of the power signal at the fundamental frequency but also other sequence components at other harmonic frequencies is presented.