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Asymmetric Synchronous Reference Frame-Based Frequency Coupling Suppression Control for Single-Phase Grid-Tied Converters

Abstract

For single-phase grid-tied voltage-source converters (VSCs), frequency coupling suppression control (FCSC) emerges as a promising technique, streamlining controller design and stability analysis. However, its performance significantly degrades in the presence of grid frequency variations. This article presents an asymmetric synchronous reference frame (ASRF)-based FCSC for single-phase gridtied converters. Leveraging the inverse generalized Park transformation-based symmetrical phase-locked loop (IGPT-SPLL) and the ASRF structure, both grid frequency adaptivity and frequency coupling suppression are realized. Under this control, the studied system is accurately modeled as a simple single-input single-output (SISO) admittance, facilitating design-oriented analysis. The proposed control method stands out for its grid frequency adaptability and the achievement of zero steady-state current error, all accomplished with the utilization of proportional-integral (PI) controllers only. Simulations and experimental results validate the effectiveness of the proposed method.

article Article

date_range 2024

language English

link Link of the paper

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Lin Zhiyu

Su Mei

Lin Jianheng

Yang Dongsheng

Xie Shiming

Wang Hui

Sun Yao

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Featured Keywords

Frequency control

Couplings

Harmonic analysis

Phase locked loops

Steady-state

PI control

Impedance

Frequency adaptability

frequency coupling suppression

single-phase grid-tied inverter

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Assessment of reinforced concrete building damages following the Kahramanmaraş earthquakes in Malatya, Turkey (February 6, 2023)

Abstract

Earthquakes of magnitude Mw = 7.7 and Mw = 7.6 hit the city of Kahramanmaraş (Turkey) on 6 February 2023. These earthquakes caused serious damage in 11 provinces in Turkey resulting in over 50,000 deaths and huge economic losses with the collapse of thousands of buildings. Two consecutive devastating earthquakes have severely damaged the reinforced concrete building stock located in Malatya. There are many reasons reinforced concrete structures suffer damage under the influence of seismic loads. These reasons can be listed as material and section properties that do not comply with earthquake codes, workmanship defects, ground parameters that are not considered and design errors, as seen in field investigations after earthquakes in Turkey in the past. In this research, a field study was conducted on reinforced concrete buildings damaged after the earthquakes in Malatya province. The causes of structural damages in reinforced concrete buildings between 6–26 years of age were assessed in terms of design and material defects. The structural damages were mainly caused due to insufficient stirrups in structural members, short column, strong beam–weak column, failures of infill walls, soft story type collapse, poor concrete quality, and reinforcement corrosion. In addition to the field investigation, the spectrum relationships created using raw acceleration data obtained from DEMP (Disaster and Emergency Management Presidency) stations in Malatya province were compared with the design response spectra.

article Article

date_range 2024

language English

link Link of the paper

Collapsed buildings

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