Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 16 of 16 for “"Transformerless"”.
-
High-efficiency Transformerless PV Inverter Circuits
… In recent years, there have been quite a few new transformerless PV inverters topologies, which eliminate the traditional line frequency transformers to achieve lower cost and higher efficiency, and maintain lower leakage current as well. With an overview of the state-of-the-art transformerless PV …
-
High Step-Up/Down Transformerless Multilevel Converter for Renewable Energy Applications
<p>This thesis focuses on a high step-up/down transformerless dc-dc modular multilevel converter (MMC) that would be applicable to dc power systems. The design achieves high voltage ratios for interfacing renewable energy sources such as photovoltaic and line interactive Uninterruptible Power …
-
Thermal Performance of AlGaN/GaN Based Power Switching Devices for Transformerless Inverters
… Voltaic (PV) system that needs to be improved. Transformerless inverters have higher efficiencies at lower weight and size specifications as compared to ones with transformers. A modified topology of a single phase transformerless inverter with new current paths and improved efficiencies is …
-
On the Synthesis of Passive Networks without Transformers
… a given impedance, with a particular focus on transformerless network synthesis. The conclusions of this thesis are relevant to the design of compact and cost-effective mechanical and electrical networks for a broad range of applications. In Part 1, we unify the Laplace-domain and phasor …
-
Energy regeneration and control in vehicle suspensions
… the controller dynamics through a lossless transformerless coupling. Transformerless conditions are investigated for lossless two-ports. 'vVe show that paramountcy is a sufficient but not necessary condition for transformerless synthesis. We also consider the design of ladder structures when …
-
Design and control of photovoltaic systems in distributed generation
… connection is proposed. This system utilizes transformerless single-stage conversion for tracking the maximum power point and interfacing the photovoltaic array to the grid. The maximum power point is achieved with the proposed maximum power point tracking method. A proportional-resonant …
-
Comparative Study of Power Semiconductor Devices in a Multilevel Cascaded H-Bridge Inverter
… thesis compares the performance of a nine-level transformerless cascaded H-bridge (CHB) inverter with integrated battery energy storage system (BESS) using SiC power MOSFETs and Si IGBTs. Two crucial performance drivers for inverter applications are power loss and efficiency. Both of these are …
-
Power electronics solutions for uninterrupted power supply and grid-tie inverters
… The first topic will discuss an on-line transformerless UPS system based on the integrated power electronics converters that is able to control the input power factor, charge the battery, and guarantee backup operation of the system. The main advantages of the proposed UPS are active …
-
Single stage boost inverter for standalone fuel cell applications
… power electronic dc-ac converter is based on a transformerless single stage power conversion scheme, which has better weight, volume and efficiency than the commonly used two stage power conversion schemes. The selected topology is the boost inverter that consists of two identical boost …
-
High Efficiency Single-stage Grid-tied PV Inverter for Renewable Energy System
A single-phase grid connected transformerless photovoltaic (PV) inverter for residential application is presented. The inverter is derived from a boost cascaded with buck converter along with a line frequency unfolding circuit. Due to its novel operating modes, high efficiency can be achieved …
-
Single-Stage Grid-Connected Multilevel Converters: Topologies and Control Strategies
… of the single-stage DC-AC converters, a new transformerless grid-connected inverter with a common-grounded circuit architecture and single-stage dynamic voltage boosting gain is proposed. The key features of the presented inverter are the reduced current stress profile, modularity, uniform …
-
A Novel DC-DC Converter for Photovoltaic Applications
… with the CI-CCS converter to form an entirely transformerless single-phase solar energy conversion system. The combination of the CI-CCS converter's bipolar DC output with the combined half bridge/T-type converter's bipolar DC input allows grounding at both the photovoltaic panels and the AC …
-
Power Converter and Control Design for High-Efficiency Electrolyte-Free Microinverters
… requires a high efficiency grid-tie inverter. A transformerless inverter topology with low electro-magnetic interference (EMI) and leakage current is presented. It has the ability to use modern superjunction MOSFETs in conjunction with zero-reverse-recovery silicon carbide (SiC) diodes to achieve …
-
Cascade Dual-Buck Inverters for Renewable Energy and Distributed Generation
… system. Thanks to flexible modular design, transformerless connection, extended voltage and power output, less maintenance and higher fault tolerance, the cascade inverters are good candidates for utility interface of various renewable energy sources. This dissertation proposes a new type of …
-
Highly Efficient Gan-Based Single-Phase Transformer-Less Pv Grid-Tied Inverter
<p>Growing energy demand and environmental concerns have led to an increased interest in renewable energy resources to provide a sustainable and low carbon emission energy supply. Among these renewable energy resources, photovoltaic (PV) systems have been the focus of many scientific researchers. …