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Modulated FCS-MPC Based on Zero-Sequence Component Injection Algorithm and Vector Synthesis Algorithm With NPP Deviation Suppression

Abstract

Conventional finite control set model predictive control (FCS-MPC) for three-phase three-level (3P-3L) converters suffers from cumbersome weighting factor design, variable switching frequency, and performance compromise in neutral point potential (NPP) and current. This article proposes a modulated FCS-MPC to eliminate weighting factor, fix switching frequency, and combine NPP balance performance with current tracking performance for 3P-3L T-type converter. First, a vector synthesis algorithm with NPP deviation suppression is adopted to improve vector accuracy for current tracking, and reduce NPP deviation by redundant vector duration time adjustment. Second, a zero-sequence component injection algorithm is proposed, which determines zero-sequence component amplitude according to capacitor charge balance algorithm, and balances NPP without weighting factor. Third, a dual carrier modulation mode is adopted to produce desired switching signals with constant frequency. Finally, advantages of proposed FCS-MPC are verified by simulation and experiment.

article Article

date_range 2024

language English

link Link of the paper

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Yan Shaomin

Cui Yue

Li Chengmin

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Featured Keywords

Dual carrier modulation

finite control set model predictive control (FCS-MPC)

neutral point potential (NPP) deviation suppression

three-phase three-level (3P-3L) T-type converter

vector synthesis

zero-sequence component injection

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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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