43 research outputs found
MODELING AND ANALYSIS OF A SWITCHED INDUCTOR ASSISTED MODIFIED Z-SOURCE INVERTER
No full textZ-source inverter (ZSI) has become an attractive replacement for the voltage source
inverter in the conventional dual-stage power conditioning system (PCS)
An Improved Non-Isolated Quadratic DC-DC Boost Converter With Ultra High Gain Ability
No full textThis paper introduces an improved quadratic DC-DC boost converter to provide an ultra-high level voltage gain with the switched-capacitor cell based structure. The proposed converter has the ability to excel the output voltage gain to the ultra-high level without any voltage doubler circuit. Hence, the total number of components is less compared to the conventional topologies. The proposed converter offers reduced voltage stress on the capacitors, diodes, and semiconductor switches while generating a high voltage gain effect with a low duty cycle. In addition, the continuous source current (CSC) and input-to-output side ground-sharing features are also available for renewable energy applications. The steady-state and comparative performance analysis with similar topologies and power loss calculations are presented in this paper. Furthermore, the simulation results extracted from the Matlab/Simulink are compared and analyzed with the conventional topology. Finally, the experiments are carried out by designing a 150 W laboratory prototype where the peak efficiency is found 90% while delivering 80 W power to the load side.Full Tex
Modified Topology of Z-Source Inverter by Switched Inductor with Series Impedance Network
No full textTabarruk dalam Pandangan Ulama’ Sunni dan Syi’ah dan Implementasinya dalam membangun karakter umat Islam: Studi Komparasi Pemikiran Zaynu Al-Abidin Ba’alawi dan Ja’far Subhani
No full textThe debate over the implementation of Tabarruk is something that still raises a lot of debate among the Muslims of the world. The majority of Muslims are very enthusiastic about carrying out this practice, while others still consider tabarruk an act of heresy and even shirk. In this literature study, the author will try to re-present the concept and understanding of tabarruk from the perspective of Sunni and Shia scholars as active adherents of tabarruk practice which will be represented through the thoughts of the two figures in this group, namely Zainal Abidin al-Ba'lawi and Ja 'far Subhani. From this concept, the author will relate the implementation to the impact of tabarruk practices in building the character of Muslims. The research used in this study is a comparative approach with a qualitative description in which the thoughts of these two figures will be coordinated and compared so as to produce a neutral and impartial. The results of this study state, that the Ahlussunnah and the Shiah have mutually agreed, that the practice of tabarruk is a legal practice and can be carried out by all Muslims in the agreed measure and rules. Therefore, these results are used as a response to criticism from parties who oppose the practice of tabarruk with accusations of polytheism and are considered to be detrimental both financially and morally for Muslims. In addition, the practice of tabarruk carried out in accordance with the Shari'ah has a positive impact on the character building of Muslims. Among the kinds of tabarruk in religious practice are: reading the Qur'an, visiting graves, seeking knowledge, and tabarruk with Sayyidina Husein's turban
Z-source inverter topologies with switched Z-impedance networks:A review
No full textThe Z-source inverter is one of the most interesting power electronic converters. Over the past decades, research and development have been in high demand to meet the challenges for improving the converter performance with reduced weight and cost while having high efficiency along with high gain or boost factor. Since the inception, tons of resolutions, customizations, and improvements have appeared to achieve these performance goals. To overcome the most common drawback, i.e. the low boost factor of classical Z-source inverters, the switched inductor/capacitor and switched boost Z-source inverter topologies have become predominant in the recent epoch. Furthermore, the higher component voltage stress, discontinuous input current, and high inrush start-up current issues have also been addressed and solved in various literature as part of this topical advancement. In this study, a comprehensive review of various switched impedance network-based Z-source inverter topologies has been accomplished for providing a quick report to researchers and engineers so that they can consider this as a one-stop solution for selecting inverters from this group. The overall study covers the methodology, features, and relevant important results of the latest switched Z-source inverter models in order to demonstrate the coordination between pitfalls and improvements
Performance Analysis of a Modernized Z-Source Inverter for Robust Boost Control in Photovoltaic Power Conditioning Systems
No full textIn this paper, the performance of a new Z-source inverter (ZSI)-based single-stage power conditioning system (PCS) is analyzed for a standalone photovoltaic (PV) power generation system. The proposed ZSI-based PCS includes two main parts: one is the input from PV units and the other is the ZSI. In this work, a new topology, termed the switched inductor-assisted strong boost ZSI (SL-SBZSI), is introduced for improving the performance of the PCS. The proposed topology shows high boosting capability during the voltage sag in PV units due to variations in solar irradiation and temperature. Another key advantage is the reduced capacitor voltage stress and semiconductor switch voltage stress of the inverter bridge, which ultimately minimizes the size and cost of the single-stage PCS. The proposed ZSI topology falls under the doubly grounded category of inverter by sharing the common ground between the input and output. This is an additional feature that can minimize the leakage current of PV units at the ac output end. The operational principles, detailed mathematical modeling, and characteristics of the proposed SL-SBZSI for a standalone photovoltaic (PV) power generation system is presented in this paper for analyzing performance. The simulation results, which are performed in MATLAB/Simulink, demonstrate the improved performance of the proposed SL-SBZSI for the standalone PV system. The performance of the proposed topology is also evaluated through an experimental validation on a laboratory-based PV system
An Improved Modified Capacitor-Assisted Z-Source Inverter with Reduced Capacitor Voltage Stress and Inrush Start-up Current
No full textAn enhanced gain non-isolated quadratic boost DC-DC converter with continuous source current
No full textAn enhanced gain non-isolated quadratic boost DC-DC converter with continuous source current.
No full textIn this paper, a non-isolated quadratic boost DC-DC converter has been proposed. The proposed converter provides high output voltage gain with a lower component count on the structure. In addition, the input side inductor provides continuous source current and the output voltage is positive. Since the proposed topology possesses the continuous source current, it simplifies the filter design at the input side further making the converter suitable for photovoltaic applications. Another important feature of this converter includes the utilization of the same switch ground that omits the additional control power supply in the system design. The detailed mathematical modeling of the proposed topology including the steady state analysis for different modes of operations, voltage stress calculations of the components, and power loss calculations have been precisely demonstrated in this work. The simulation has been carried out in Matlab/Simulink software. Finally, a 250 W experimental prototype has been developed and tested in the laboratory environment and the peak efficiency of the proposed topology has been found 92% at 50% duty cycle, which validates the correctness of the theoretical and simulation outcomes of the proposed work
