Design of a highly efficient charger for Nickel-Iron batteries Anil Kumar Ananda Master of Science Thesis Electrical Power Engineering at Delft University of Technology

Design of a highly efficient charger for Nickel-Iron batteries Anil Kumar Ananda Master of Science Thesis Electrical Power Engineering at Delft University of Technology Faculty of Electrical Engineering, Mathematics and Computer Science (EEMCS) · Delft University of Technology
 Abstract 
 Obtaining good performance from stand-alone PV systems requires successful integration of batteries that are reliable, effective, long lasting, environmental-friendly and affordable as it is crucial to deal with variable solar illumination throughout the year. Nickel Iron battery technology (Ni-Fe) is a perfect fit for the solar-powered households as it is satisfies all the requirements. Charge controllers need to be efficiently designed for Ni-Fe batteries for protection from overcharge/discharge. This thesis concentrates on selecting the best topology from B2R converters from the patent 550 of ESA to be applied for designing the charge controller for Ni-Fe batteries. An analysis is carried out to determine the advantage of B2R converters in the patent over conventional buck-boost topologies like SEPIC or Cuk and evaluate their utility for charge control applications. The focal point of topological selection will be the evaluation of topologies on the basis of efficiency and complexity for realistic adaptation into a charge controller. After defining the load power parameters, the operation of the topologies in two different modes of conduction (BCM & CCM) is investigated and an analytical model is developed for losses. Significant factors that play a role in determining the efficiency for varying source parameters (input voltage) are scrutinized. The relative merits of using BCM/CCM for design are inspected by carrying out simulations for loss calculations using the analytical model with data-sheet parameters from realistic components for their suitability for the application. Component selection is done by keeping in mind the prevalent technologies in the market that are costeffective and the procedure followed in the design of magnetics for the topologies in different modes of conduction and its impact on efficiency is discussed and an assessment is carried out on the performance of the components with variations in input voltage for the same power level. The proposed analytical models for switching losses in MOSFETs and overall losses topologies are validated by carrying out experiments on the prototypes of two best topologies in both conduction modes. The results critique the accuracy of the analytical model in determining the actual efficiency of the topologies, the margin of deviation by means of comparison with the experimental results and concludes with suggestions for selecting the most efficient topology and recommends a mode of conduction for best results.
LINK
https://repository.tudelft.nl/islandora/object/uuid:6d77615d-925e-4a7e-88d7-818552522bda/datastream/OBJ/download

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POWER ELECTRONICS SOLUTIONS FOR UNINTERRUPTED POWER SUPPLY AND GRID-TIE INVERTERS A Thesis Submitted to the Faculty of Purdue University by Omar N. Nezamuddin

POWER ELECTRONICS SOLUTIONS FOR UNINTERRUPTED POWER SUPPLY AND GRID-TIE INVERTERS A Thesis Submitted to the Faculty of Purdue University by Omar N. Nezamuddin Master of Science in Electrical and Computer Engineering

 ABSTRACT
 Nezamuddin, Omar N. MSECE, Purdue University, December 2014. Power Elec-tronics Solutions for Uninterrupted Power Supply and Grid-Tie Inverters.
 Major Professor: Euzeli dos Santos Jr.
 This thesis proposes two new topologies for Uninterrupted Power Supply (UPS), and a grid-tie microinverter. The rst topic will discuss an on-line transformerless UPS system based on the integrated power electronics converters that is able to con- trol the input power factor, charge the battery, and guarantee backup operation of the system. The main advantages of the proposed UPS are active power factor correc- tion (PFC) without the need of a complex control scheme, and integrated functions of the battery charger circuit and PFC with only three power switches. Operation modes of the system and the PWM strategy is presented in detail. The second topic discussed is of a proposed circuitry for a single-phase back-to-back converter for UPS applications. The main advantages of this topology is higher number of levels at the recti er side, less number of power switches, and no need for a boost inductor at the input side of the converter. The last topic discussed is of a proposed patent pending microinverter. This topic was a project funded by the National Science Foundation, and its aim was to help commercialize the research. This project proposes a solution for a solar inverter called Delta Microinverter that allows easier and faster installation as well as power conversion with higher efficiency. Delta Microinverters innovation is found in its patent-pending shape and in its patent-pending circuitry, i.e., electronics mounted inside of the Delta Microinverter. The Delta Microinverters shape has a housing con gured for rapid mounting using a single fastener and its power electron- ics con guration offers an optimized relationship between the number of levels and number of power switches.
LINK
https://core.ac.uk/reader/81633520

IMPLEMENTATION OF ONLINE IMPEDANCE MEASUREMENT SETUP FOR THREE-PHASE GRID-CONNECTED INVERTERS - TOMMI REINIKKA-Tampere University of Technology Master of Science Thesis

TOMMI REINIKKA: Implementation of online impedance measurement setup for three-phase grid-connected inverters Tampere University of Technology Master of Science Thesis,March 2017

 ABSTRACT
 In the thesis a fast method for measuring the output impedance of a grid-connected inverter by broadband excitation and cross-correlation techniques is studied. The study is made for determining stability of a grid-connected power electronics system by using impedance based stability criterion. The goal of this work is to build a test bench for inverter experiments and to verify the accuracy of the used measurement technique. Renewable power generation, such as solar and wind power, require a way to synchronize and connect to the grid. This is usually done by using grid-parallel inverters. However impedance mismatch between the grid and the interfacing inverter may cause the inverter to generate harmonic resonances. The resonance problems can be analyzed and prevented using analytical inverter models or measured frequency responses. In this thesis pseudo-random sequences and grid emulator are used to measure the inverter output impedance at a high frequency band. The experiments were done by injecting the pseudo-random binary sequence signal into the grid voltage reference. The grid voltages and currents were measured and used to calculate the inverter's frequency response with voltage as the input and current as the output. The measurements were veri ed by comparing them to theoretical values.

LINK
https://core.ac.uk/reader/80539115