A modified SOGI-FLL algorithm with DC-offset rejection improvement for single-phase inverter applications

Ardalan, P Bani; Rasekh, Navid; Khaneghah, Mohammad Zamani; Abrishamifar, Adib; Saeidi, Masood

doi:10.1007/s40435-022-00932-6

Cited by 3 publications

(2 citation statements)

References 38 publications

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“…The DC offset in the grid voltage can result from different sources, such as grid faults, geomagnetic phenomena, A/D conversion, the offset of voltage sensors, sampling, measurement errors, the DC injection by the distributed system, and implementation of control algorithms in microcontrollers [11][12][13][14][15][16][17]. The presence of the DC offset resulted in a fundamental frequency oscillation in the estimated grid parameters, affecting the closedloop stability, power quality, and operation of the grid-connected converter.…”

Section: Introductionmentioning

confidence: 99%

Advanced Single-Phase PLL-Based Transfer Delay Operators: A Comprehensive Review and Optimal Loop Filter Design

Bany Fawaz,

Smadi,

Albatran

et al. 2024

Energies

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In recent years, several research works have addressed and developed the phase-locked loop (PLL) in single-phase grid-connected converters with different structures and properties. Each has merits and demerits, such as a complex structure, high computational burden, and slow transient response. This paper aims to comprehensively review advanced single-phase PLLs based on transport delay operators to realize signal orthogonality. A deep insight into the PLLs’ small-signal modeling, main characteristics, stability analysis, and loop filter design are provided in this paper. The main advantages and drawbacks are explained for each type of PLL in terms of different performance indexes, such as settling time, estimation error, and ripples in the estimated grid information. This paper also aims to provide optimal tuning and design of the loop filter gains from the large-signal model point of view, including all the nonlinearities, adopting the stochastic optimization method. All simulations are implemented using the MATLAB/Simulink 2018b environment to validate all theoretical analyses of this paper. The sampling and nominal frequencies are set to be 100 kHz and 50 Hz throughout all the simulation studies.

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Section: Introductionmentioning

confidence: 99%

Advanced Single-Phase PLL-Based Transfer Delay Operators: A Comprehensive Review and Optimal Loop Filter Design

Bany Fawaz,

Smadi,

Albatran

et al. 2024

Energies

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“…However, controlling inverter-based DERs presents significant challenges due to their lack of inertia [5]. This lack of inertia complicates maintaining stability within the power system, leading to potential instabilities and blackouts [6]. DERs are small-scale power-generation and -storage systems and can operate in various topologies such as islanded mode, grid-connected mode, and microgrids [7].…”

Section: Introductionmentioning

confidence: 99%

A Review of Control Techniques for Inverter-Based Distributed Energy Resources Applications

Hasheminasab,

Alzayed,

Chaoui

2024

Energies

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The escalating adoption of low-carbon energy technologies underscores the imperative to transition from conventional fossil fuel-dependent sources to sustainable alternatives. The expansion of Distributed Energy Resources (DERs) signifies an essential shift towards a more resilient and environmentally friendly energy landscape. However, integrating inverter-based DERs introduces challenges, particularly in system inertia and grid instability. This review delves into the critical area of inverter-based grid control strategies, focusing on the primary and secondary control mechanisms. Primary controls are investigated, including traditional droop control and low-voltage ride-through (LVRT) capability. The secondary control strategies, involving virtual impedance (VI) and load frequency control (LFC), are vital in maintaining grid stability and reliability are reviewed. The aim is to offer a comprehensive understanding of the principles, advancements, and challenges associated with inverter-based grid controls, contributing valuable insights for the seamless integration of DERs into modern power grids.

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Optimal loop filter design of a DC immunity single-phase PLL based single delay operator

Bany Fawaz,

Smadi

2024

Int. J. Dynam. Control

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A modified SOGI-FLL algorithm with DC-offset rejection improvement for single-phase inverter applications

Cited by 3 publications

References 38 publications

Advanced Single-Phase PLL-Based Transfer Delay Operators: A Comprehensive Review and Optimal Loop Filter Design

Advanced Single-Phase PLL-Based Transfer Delay Operators: A Comprehensive Review and Optimal Loop Filter Design

A Review of Control Techniques for Inverter-Based Distributed Energy Resources Applications

Optimal loop filter design of a DC immunity single-phase PLL based single delay operator

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