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Power Balancing Strategy for Cascaded H-Bridge Inverter in a Grid-Connected Photovoltaic System Under Asymmetrical Operating Conditions

Abstract

Cascaded H-bridge multilevel inverter is a well-established technology for photovoltaic systems. Power imbalance occurs in the system because of the environmental dependence of photovoltaic modules, damage and dusting of panels, and the ageing effect. Subsequently, the power handled by H-bridge modules is unequal. As a result of power imbalance, the H-bridge modules carrying higher power are likely to get overmodulated, increasing the distortion in grid current. Due to this, reliability of the system is affected. The ability of existing harmonic compensation techniques to counter this issue is limited to a modulation index of 4/pi. In the view of this adversity, a voltage alteration method along with an optimization algorithm is proposed in this article to alleviate the power imbalance issue. The presented simulation and experimental results validate the proposed method.

article Article

date_range 2024

language English

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Tanguturi Jitendra

Keerthipati Sivakumar

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Cascaded H-bridge (CHB) inverter

harmonic compensation

optimization

power extracted

power imbalance

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Effect of corrosion on flexural strength of reinforced concrete beams with polypropylene fibers

Abstract

An experimental study was performed to investigate the effects of polypropylene fibers on uncorroded and corroded reinforced concrete beams. Three different volume fractions of polypropylene fibers having 0, 0.5, and 1.5%, were tested at four corrosion levels of 0% and approximately 5, 7, and 9%. A full scale of an accelerated corrosion pool was used for the accelerated corrosion process. Reinforced concrete beams were used for an under monotonic bending test. The contribution of the actual corrosion levels of transverse and longitudinal reinforcement bars to the total corrosion levels were obtained from reinforcement bars fully extracted from concrete. Flexural strength, bond-slip, and moment-curvature relationships were examined for uncorroded and corroded reinforced concrete beams. A new model was developed to predict the flexural strength of corroded reinforced concrete beams. The proposed model for predicting the residual flexural strength of corroded beams was compared with test data published in previous studies. Furthermore, a novel model is presented for improved predictions between the actual and theoretically estimated corrosion mass losses, based on Faraday’s law, with the aid of fully extracted reinforcement bars. The model used to predict the flexural strength of corroded reinforced concrete beams with large sizes demonstrated good agreement with current and previously published literature data. In the case of corroded beams comprising differing amounts of polypropylene fibers, the performance of the corroded beams was limited by a fiber volume fraction of 1.5% at low corrosion levels.

article Article

date_range 2018

language English

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