Minimisation of power oscillations with a novel optimal control strategy for distributed generation inverter under grid faulty and harmonic networks

Meral, Mehmet Emin; Çelík, Doğan

doi:10.1049/iet-rpg.2019.1325

Cited by 6 publications

(2 citation statements)

References 46 publications

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“…Regarding the harmonic content, most of the flexible current controllers use the approach presented in Section 4.2 to minimize harmonic contents. Nevertheless, some level of power oscillations or harmonic content may be acceptable if a suitable voltage recovery is achieved [79]. Once this analysis is complete, the designer must decide if the performance of the algorithm is adequate.…”

Section: Secondary Objectivesmentioning

confidence: 99%

An Overview of Flexible Current Control Strategies Applied to LVRT Capability for Grid-Connected Inverters

et al. 2023

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Distributed power generation plays a critical role in the stability and reliability of modern power systems. Due to the rapid growth of renewable energy generation, the requirements of the transmission and distribution system operators are becoming more stringent. Among these requirements, one of the most important is the Low-Voltage Ride-Through (LVRT) capability, which demands that the inverters remain connected to the grid and provide support during voltage sags. For this purpose, flexible current control algorithms stand out because they can manage unbalanced voltages and simultaneously achieve other control objectives. With the aim of presenting a concrete document focused on describing fundamental principles and discussing common design guidelines, this paper presents an overview of flexible current control strategies applied to LVRT capability. The operation features and design aspects of experiences reported in the literature are reviewed. Moreover, the paper proposes a general methodology to design LVRT flexible current control algorithms. Finally, current and future trends are discussed.

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Section: Secondary Objectivesmentioning

confidence: 99%

An Overview of Flexible Current Control Strategies Applied to LVRT Capability for Grid-Connected Inverters

et al. 2023

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“…Voltage imbalances in the grid are common occurrences resulting from asymmetrical loads or faults in the system. These unbalances lead to voltage sags, fluctuations, and disturbances that can adversely affect grid-connected PV systems [4][5][6]. The primary component that suffers under these conditions is the power converter, which is responsible for converting the variable Direct Current (DC) output of the PV array into a stable Alternating Current (AC) output compatible with the grid.…”

Section: Introductionmentioning

confidence: 99%

Control Approach of Grid-Connected PV Inverter under Unbalanced Grid Conditions

Alharbi

2024

Processes

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In grid-connected photovoltaic (PV) systems, power quality and voltage control are necessary, particularly under unbalanced grid conditions. These conditions frequently lead to double-line frequency power oscillations, which worsen Direct Current (DC)-link voltage ripples and stress DC-link capacitors. The well-known dq frame vector control technique, which is effective under normal conditions, struggles with oscillatory component management in unbalanced grid conditions. To address this issue, this paper presents an advanced control approach designed for grid-connected PV inverters. The proposed approach is effective at reducing oscillations in the DC-link voltage at double the grid frequency, thereby enhancing system stability and component longevity. This method introduces a feedback control method designed to regulate oscillatory components that appeared within the dq frame and suppress the DC-link voltage oscillations under imbalance conditions, including single line-to-ground (SLG) faults. Additionally, the control scheme incorporates a maximum power point tracking (MPPT) controller to optimize PV efficiency. Comprehensive simulations demonstrate the effectiveness of this method in maintaining sinusoidal current injections and stabilizing DC-link voltage during unbalanced grid conditions. Simulation results show that the control scheme effectively stabilizes DC-link voltage, maintains balanced grid current, and ensures constant active power under various conditions, including SLG faults and solar irradiance changes.

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Robust estimation of fundamental frequency positive-sequence component for grid-integration applications in energy systems

Ahmed

Ushirobira²,

Efimov³

2022

Energy Reports

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Minimisation of power oscillations with a novel optimal control strategy for distributed generation inverter under grid faulty and harmonic networks

Cited by 6 publications

References 46 publications

An Overview of Flexible Current Control Strategies Applied to LVRT Capability for Grid-Connected Inverters

An Overview of Flexible Current Control Strategies Applied to LVRT Capability for Grid-Connected Inverters

Control Approach of Grid-Connected PV Inverter under Unbalanced Grid Conditions

Robust estimation of fundamental frequency positive-sequence component for grid-integration applications in energy systems

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