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Dissertations / Theses on the topic 'Quasi Z source'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Latifi, Hojjat. "Enhanced performance bidirectional quasi-Z-source inverter controller." Thesis, University of East London, 2015. http://roar.uel.ac.uk/4669/.

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A novel direct control of high performance bidirectional quasi-Z-source inverter (HPB-QZSI), with optimized controllable shoot-through insertion, to improve the voltage gain, efficiency and to reduce total harmonic distortion is investigated. The main drawback of the conventional control techniques for direct current to alternating current (DC-AC) conversion is drawn from the multistage energy conversion structure, which implies complicated control, protection algorithms and reduced reliability due to the increased number of switching devices. Theoretically, the original Z-source, Quasi-Z-sour

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2

Yong, Sut Khan. "Grid-tie Quasi Z-Source Inverter-Based Static Synchronous Compensator." Thesis, Curtin University, 2018. http://hdl.handle.net/20.500.11937/75945.

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This research work proposes intensive study and mathematical modelling analysis of transformer-less quasi Z-source inverter (qZSI) based static synchronous compensator (STATCOM) system. In this work, a single-phase qZSI is acted as a STATCOM system to compensate the grid reactive power at the point of coupling under different loading conditions. A new controller-based lead compensator is developed to achieve fast DC-link voltage balance across each qZS network. Simulation studies are conducted to evaluate the controller’s performance.

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3

Gorgani, Aida Gorgani. "Quasi Z-Source-Based Multilevel Inverter For Single Phase Photo Voltaic Applications." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1471615403.

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4

Al-Egli, Fares, and Moumin Hassan Mohamed. "Control, Design, and Implementation of Quasi Z-source Cascaded H-Bridge Inverter." Thesis, Linköpings universitet, Elektroniska Kretsar och System, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-152711.

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This report is about control, design and implementation of a low voltage-fed quasi Z-source three-level inverter. The topology has been interesting for photovoltaic-systems due to its ability to boost the incoming voltage without needing an extra switching control. The topology was first simulated in Simulink and later implemented on a full-bridge module to measure the harmonic distortion and estimating the power losses of the inverter. An appropriate control scheme was used to set up a shootthrough and design a three-level inverter. The conclusion for the report is that the quasi Z-source inv

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5

Lannert, Thomas [Verfasser]. "Dimensionierung und Betrieb des Quasi-Z-Source-Umrichters als Antriebsstromrichter für permanentmagneterregte Synchronmaschinen / Thomas Lannert." München : Verlag Dr. Hut, 2016. http://d-nb.info/112076291X/34.

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6

Lannert, Thomas [Verfasser], and M. [Akademischer Betreuer] Braun. "Dimensionierung und Betrieb des Quasi-Z-Source-Umrichters als Antriebsstromrichter für permanentmagneterregte Synchronmaschinen / Thomas Lannert. Betreuer: M. Braun." Karlsruhe : KIT-Bibliothek, 2015. http://d-nb.info/1100529578/34.

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7

Kitson, Joanne. "Shunt regulation of a three-phase voltage bus by means of a bi-directional voltage-fed quasi Z-source inverter." Thesis, University of Bristol, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.761205.

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8

Westphal, Maximillian. "Investigation of low energy, alternative X-ray sources and their interactions with multi-Z materials for theranostics." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1571133365330023.

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9

Gálus, Matej. "Systém napájení domácnosti z obnovitelných zdrojů energie." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219124.

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The aim of this thesis is to describe the advantages of simultaneous utilization of photovoltaic and wind electricity in an autonomous system, supplying the household with electricity without connection to the electrical grid. The most used methods of connecting photovoltaic modules and wind generators to chemical batteries are discussed. Several maximum power point tracking methods and their properties are described. A block schematic diagram of an autonomous off-grid system utilizing chemical accumulators is proposed. The system also contains an inverter producing standard mains voltage 230

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10

CHANG, FU-CHENG, and 張富程. "Three-Phase Quasi Z-Source Inverters with FPGA Implementation." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/26dcxj.

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碩士<br>國立高雄應用科技大學<br>電機工程系博碩士班<br>104<br>This paper investigates the space vector modulation (SVM) for two-level and three-level Quasi Z-Source inverters (qZSI). The qZSI uses a unique impedance network and shoot-through state to achieve output line-to-line voltage can be higher than input voltage, overcome the limitation of traditional voltage-source inverters. When SVM applied to qZSI, the switching sequence must be modified to add the shoot-through state and only change partial or full of the zero state but can’t affect active state. Discussed the modifications of two-levl and three-level SV

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11

Yang, Ting Ou, and 歐陽霆. "A novel Space Vector Modulation strategy for quasi-Z-source inverters." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/6djxmw.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>105<br>Quasi-Z-source inverter (qZSI) features high compactness, low component and thermal stresses, continuous input current and the capability of simultaneously carry out both DC voltage boost and DC-AC inversion. For qZSIs, sinusoidal pulse width modulation (SPWM) method is typically applied. Comparing with SPWM, space-vector PWM (SVPWM) has advantages such as low current harmonics and high voltage utilization; hence, the traditional space-vector concept has been modiﬁed to be applicable for the qZSI in the literatures. In this thesis, a novel SVPWM strategy for q

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12

Chen, Jia-Cing, and 陳嘉慶. "Development of a Novel Modulation Strategy for Quasi-Z-source Inverter." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/36w2eu.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>104<br>In this thesis, the design and implementation of a novel modulation strategy for Quasi-Z-source inverter (qZSI) is first presented. The developed qZSI features high compactness, low component and thermal stresses, continuous input current and can simultaneously carry out both DC voltage boost and DC-AC inversion. Based on the realized qZSI, a modified qZSI sinusoidal pulse-width modulation (qZSPWM) strategy is proposed. Instead of placing the shoot-through state in both inverter legs, the proposed method generates the shoot-through state only in left/right inv

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13

Lin, Kuan-yu, and 林冠宇. "Design and Implementation of a Quasi Z-source Inverter for Stand-alone Photovoltaic Systems." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/57047877834050122295.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>101<br>The design and implementation of a quasi-Z-source inverter (qZSI) for standalone photovoltaic generation systems (PGSs) is proposed in this thesis. The qZSI is derived from the traditional Z-source inverter, which can realize both DC voltage boost and DC-AC inversion simultaneously in a single stage. The advantages of using qZSI for standalone PGS include compactness, low cost, and higher reliability. In addition, qZSI offers several advantages over the ZSI, including lower component rating and continuous input current. For a standalone PGS, maximum power poin

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14

Cai, Jhong-Bin, and 蔡忠彬. "Implementation of a Single-Phase Quasi Z-Source Inverter with Indirect Current Control Algorithm for a Reconfigurable PV System." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/6s77v3.

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碩士<br>國立高雄應用科技大學<br>電機工程系博碩士班<br>102<br>Based on a single-phase Quasi Z-source inverter and the grid-connected system, a reconfigurable PV system was built. A Digital Signal Processor (DSP) is used to implement the indirect current control algorithm of Quasi Z-source inverter. The DC bus and the output voltage can be effectively regulated by shoot-through and non-shoot-through modes; then, the zero-point detector circuit with PLL control and power control is used to facilitate the parallel connection of the inverter to grid. In addition,when the grid is in fault condition, the system can regul

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15

Gu, Yu-Song, and 辜昱崧. "Implementation of a Single-Phase Quasi Z-Source Inverter with Voltage Dip Mitigation for a Grid Connected PV System." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/61730302081156937415.

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碩士<br>國立高雄應用科技大學<br>電機工程系博碩士班<br>101<br>Based on single-phase Quasi Z-source inverter, a grid-connected PV system was built; besides, a Digital Signal Processor (DSP) is used to implement the power control and improve the voltage quality problem caused by voltage dip. The zero-point detector circuit by PLL control is used to facilitate the parallel connection of the inverter to grid; in the meantime, the DC bus and the output voltage can be effectively regulated by shoot-through and non-shoot-through modes. In addition, the power angle and the voltage amplitude are used to regulate active and

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16

Pina, Manuel António de. "Sistema Fotovoltaico Ligado à Rede Usando um Conversor Multinível Quasi-Z do Tipo T." Master's thesis, 2021. http://hdl.handle.net/10400.26/35682.

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Os inversores quasi-Z de três níveis (qZS) baseados na topologia tipo T são especialmente indicados para uso em sistemas fotovoltaicos conectados à rede. Na verdade, apresentam uma característica importante para este tipo de aplicação, pois apresentam a característica redutor/elevador. Além disso, também é caracterizado por alta confiabilidade e operação multinível. Porém, associados a este conversor, devem ser utilizados controladores que garantam seu melhor desempenho. Neste contexto, esta dissertação irá propor um sistema de controlo global para o inversor trifásico tipo T qZS em um sistema

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