Download or read book Design and Implementation of a Grid connected Solar Micro inverter Using a Single stage Galvanically Isolated Topology with Integrated Magnetics written by Hafis Umar-Lawal and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solar panels have been steadily increasing in capacity and decreasing in cost over the past few years. Given this context, and other incentives designed to increase renewable energy penetration, residential solar adoption is becoming more economically attractive. The solar AC module stands out amongst alternative residential solar technologies, for better modularity, higher efficiency, and ease-of-use. The Micro-Inverter (MI) topology bundled with the AC module then becomes a key factor in the overall cost, safety, and capacity of the system. The Flyback (FB) MI topology is a popular choice, thanks to its low component count and enhanced safety, but as modern residential solar panels trend towards 400 W and up, non-interleaved FB MIs, typically rated around 200 W, must become interleaved. Conventional FB MI interleaving is High Frequency (HF) interleaving, which adds a potentially bulky magnetic device to the topology. This thesis proposes and tests the application of an alternate topology, called the Isolated Manitoba Inverter (ISOMBI). The ISOMBI uses integrated magnetic devices and Low Frequency (LF) interleaving, to match the power rating of HF-interleaved FB MIs, without the extra bulky component. ISOMBI operating principles and analyses are disclosed, and an experimental prototype is constructed to test its ability as a grid connected power generator. The results show near unity Power Factor (PF), acceptable DC current levels and promising Total Demand Distortion (TDD). Overall, these results indicate that the LF-interleaved ISOMBI can be considered as a viable alternative to the HF-interleaved FB MIs in AC modules.

Download or read book Analysis Design and Control of a Single Phase Single Stage Grid Connected Transformerless Solar Inverter written by Manisha Verma and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: As energy utilization is increasing with the rise in the world's power demand, the traditional energy sources are depleting at a high pace. It has led to attention drawn towards inexhaustible energy resources. There is a huge augmentation in the power generation from renewable energy sources (RES) like wind, solar, hydropower, biomass, etc. to reduce the stress on conventional energy sources like fossil fuels, oil, gas, etc. There has been a steep increase in interest for wind and solar energy systems. PV energy has been growing swiftly in the past two decades which made it most demanded power generation system based on RES. This worldwide requirement for solar energy has led to an immense amount of innovation and development in the Photovoltaic (PV) market. The Conventional grid-connected PV inverter was either with DC/DC converter or without DC/DC converter. These inverters were isolated using a transformer either on the grid (AC) side as a low-frequency transformer or as a high-frequency transformer on the DC side. Elimination of the transformer leads to a galvanic connection between the grid and PV module. This gives rise to the flow of leakage current which is disastrous for the system when it exceeds a specific value. Thus, minimization of this leakage current after the removal of the transformer has been an interesting topic explored by many researchers. Many topologies have been proposed targeting reduction in this leakage current either by 1.) Directly connecting the PV negative with neutral of utility grid or 2.) Disconnecting the PV panel side from AC side. This generally involved addition of more switches or diodes or supplementary branches to disconnect during the freewheeling period. Generally, the above-mentioned ways lead to a reduction in efficiency due to increased losses or complex circuitry. The motivation of this thesis is to design a transformerless inverter for single-phase PV grid-tied system with a smaller number of devices and still has minimum ground current. It discusses the prevailing inverter topologies in detail and then explains the modes of operation of the proposed inverter. A simple control strategy has been derived and passive elements of the inverter are designed. The simulation results presented have validated the theoretical claims. The experimental results which are similar to simulation results are evidence that the proposed topology is suitable for PV grid-tied systems. Also, the dynamic modeling of the inverter has been done to derive the plant transfer function. Then, the Proportional Resonant (PR) controller has been designed to ensure the flow of sinusoidal current into the grid with zero steady-state error and constant sinusoidal grid voltage irrespective of load change. The simulation and experimental results achieved high performance which makes this topology successful and promising for grid-tied PV systems.

Download or read book Resonant Micro Inverters for Single Phase Grid connected Photovoltaic Systems written by and published by . This book was released on 2015 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis addresses the design and implementation of micro-inverters for grid-connected single-phase photovoltaic (PV) systems. Despite the existing research issues concerning Micro-inverters, they have recently become very attractive due to their modularity and capability of independent maximum power point tracking (MPPT). The complexity in the design of micro-inverters stems from strict grid connection standards and high expectations of compactness, large amplification gain, high efficiency over a wide range of operating conditions and excellent output power quality. Moreover, since micro-inverters are exposed to a wide temperature range, the reliability and life-time of this technology are major problems. The main limiting factor in the life-time of micro-inverters is the use of large electrolytic capacitors for power decoupling. New circuit configuration and control structures to design a compact and efficient micro-inverter with high quality and robust output power injection capabilities are introduced in this thesis. In the proposed topology electrolytic capacitors are eliminated, removing the obstacles in achieving a durable and reliable design. To achieve a compact design, the proposed micro-inverter consists of a soft-switching high frequency resonant converter at the input and a hard-switching lower frequency inverter with a high order filter at the output. Small and large signal models of the resonant converter are obtained to design controllers. A new optimal controller and a design method are also proposed for the inverter that yield robust performance with a high quality output in the presence of grid voltage harmonics, impedance uncertainties and frequency changes. Furthermore, using a new nonlinear control strategy, a direct instantaneous power control method is proposed to achieve fast active and reactive power injections into the grid without using the measurement or calculation of active and reactive powers. A comprehensive steady state analysis is carried out to arrive at a final design that ensures optimum responses for all operating conditions. Moreover, for all proposed controllers, stability analysis is performed to guarantee sufficient stability margins accounting for uncertainties and nonlinearities. Analytical, simulation and experimental results are presented to verify the effectiveness of the proposed methods.

Download or read book Design and Implementation of a Microgrid capable Solar Inverter written by Gavin M. Darcey and published by . This book was released on 2013 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: The notion of a practical microgrid -- a small, interconnected system of generators and loads that operates both synchronously with a larger, centralized grid and isolated from the grid, autonomously -- has grown popular as electric utilities are installed more frequently in areas lacking a pre-existing central grid. To research the effects of both intentional disconnects and unintentional faults within a microgrid and between it and the central utility, we have constructed such a system in simulation by using hardware to simulate the real-world generators and loads of the microgrid and have connected it to the MIT utility.[1] The microgrid requires a clean, efficient switching system in order to connect and disconnect its components, and this thesis begins with an explanation of the control hardware and software interface implemented to do so. Next, this thesis details the design of one of the main generating sources for the microgrid, the inverter for a hardware-simulated solar panel. Solar panels with DC output are virtually always connected through a power inverter to produce the usable three-phase AC on the power grid. This particular inverter design is intended to be control-scheme agnostic; the actual operation of it will vary with different control algorithms. It is designed to be a general purpose, three phase 2.3 kW power inverter, albeit with specifically added modules to suit this particular microgrid. This thesis covers both the design of the circuit and the finished layout of its printed circuit board.

Download or read book Single Stage Grid Connected Micro Inverter for Photovoltaic Systems written by NIKHIL. SUKESH and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Implementation of a PV Module Integrated Dual Boost DC AC Converter Based Isolated Microinverter for Grid Connected Application written by Kamalathiyagarajan Sarasagopalan and published by . This book was released on 2020 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this article, a Photovoltaic (PV) array-integrated dual-boost dc-ac converter operating as an isolated single-phase microinverter is presented to track and export the power produced on the PV array to grid and load. The single-phase microinverter, which utilizes the cascaded connection of the dc-dc converter, rectifier, and an inverter, offers high boosting gain with low-duty ratio. However, the cascaded connection of the converters offers low conversion efficiency that is due to the usage of an increased number of power-switching devices. The proposed isolated dual-boost microinverter is designed to offer high Maximum Power Point Tracking efficiency, high conversion ratio, and high conversion efficiency with a reduced number of switches and passive elements. The design considerations and six different modes of the microinverter are presented. The simulated and experimental results are presented to investigate the proposed dual-boost dc-ac converter-operated microinverter.

Download or read book Development of Micro Inverter Using Phase Modulated Converter written by Mohd Afroz Akhtar and published by LAP Lambert Academic Publishing. This book was released on 2014-02 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: Increasing energy demand with rapid depletion of limited fossil fuel reserves has led to increase in global demand for clean energy sources and its harnessing technologies with higher efficiency and reliability. Solar energy has proved to be very promising in its usefulness as an effective, inexhaustible and environmental friendly source of energy. Building Integrated Photovoltaic (BIPV) technology amongs various methods of solar energy harvesting is a good solution to ensure better utilization of solar energy in rural and/or urban areas having many residential and commercial buildings. Each BIPV panel is connected to grid through an individual micro-inverter eliminating the problems of partial shading, dc arcs and space requirements etc. which is associated with conventional inverter technologies. The book deals with design and development of dual stage micro-inverter, where in dc-dc boost conversion is achieved using phase modulation topology. Selected topology and developed control schemes are validated in PSIM(r) simulation environment. An experimental setup is developed with TMS320F28335 Digital Signal Controller (DSC) as embedded platform to validate the control strategies.

Download or read book Integrated Microinverter and Storage for Portable Photovoltaic Systems written by Khalil Alluhaybi and published by . This book was released on 2020 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent emergence of battery technology has resulted in increased interest in design of an integrated portable photovoltaic panel with a battery pack for stand-alone and grid-connected system. Lithium-ion batteries appear to be an optimal candidate due to high energy density, long cycling life, deep discharge ability, low self-discharge and different shapes such as cylindrical or prismatic styles to obtain an integrated design. The physical integration of the PV panel with batteries must feature scalability, adaptability and easy installation. These requirements validate the microinverter as desired power electronic solution for the proposed system. To eliminate the issues of the PV power fluctuation, various microinverter topologies have been proposed in this dissertation which integrate a battery as a storage element with PV panel. The integrated battery is dedicated to eliminating the intermittent and the excessive power concerns in PV system. This allows the PV, local energy storage, and a smart integrated micro-inverter to be consolidated and mounted as one module on the back of the PV panel. The efficient energy management system will provide stable predictable power in grid-connected applications. The topologies feature either five or six power flow scenarios based on the power generated by PV module, the grid requirement and the battery state of charge. The power flow scenarios can be as follows: 1) Only PV module providing power to the grid. 2) Only battery providing power to the grid. 3) PV module providing power to the grid while charging the battery. 4) Both PV and battery providing power to the grid. 5) PV module charging the battery. 6) The grid charging the battery. All power flow scenarios are achieved with single-stage conversion between three ports with faster response, low component counts, compact size and centralized control to manage the power among the ports.

Download or read book Investigation of Dual stage High Efficiency Density Micro Inverter for Solar Application written by Lin Chen and published by . This book was released on 2014 with total page 111 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation presents modeling and triple-loop control for a high efficiency three-phase four-wire inverter for use in grid-connected two-stage micro inverter applications. An average signal model based on a synchronous rotation frame for a three-phase four-wire inverter has been developed. The inner current loop consists of a variable frequency bidirectional current mode (VFBCM) controller which regulates output filter inductor current thereby achieving ZVS, improved system response, and reduced grid current THD. Active damping of the LCL output filter using filter inductor current feedback is discussed along with small signal modeling of the proposed control method. Since the DC-link capacitor plays a critical role in two-stage micro inverter applications, a DC-link controller is implemented outside of the two current control loops to keep the bus voltage constant. In the end, simulation and experimental results from a 400 watt prototype are presented to verify the validity of the theoretical analysis.

Download or read book Solar based Single stage High efficiency Grid connected Inverter written by Feng Tian and published by . This book was released on 2005 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: Renewable energy source plays an important role in the energy cogeneration and distribution. Traditional solar-based inverter system is two stages in cascaded, which has a simpler controller but low efficiency. A new solar-based single-stage grid-connected inverter system can achieve higher efficiency by reducing the power semiconductor switching loss and output stable and synchronized sinusoid current into the utility grid. Controlled by the digital signal processor, the inverter can also draw maximum power from the solar array, thereby maximizing the utilization of the solar array.

Download or read book Solar Micro Inverter written by Shweta Hegde and published by . This book was released on 2014 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: The existing topologies of solar micro inverter use a number of stages before the DC input voltage can be converted to AC output voltage. These stages may contain one or more power converters. It may also contain a diode rectifier, transformer and filter. The number of active and passive components is very high. In this thesis, the design of a new solar micro inverter is proposed. This new micro inverter consists of a new single switch inverter which is obtained by modifying the already existing single ended primary inductor (SEPIC) DC-DC converter. This new inverter is capable of generating pure sinusoidal waveform from DC input voltage. The design and operation of the new inverter are studied in detail. This new inverter works with a controller to produce any kind of output waveform. The inverter is found to have four different modes of operation. The new inverter is modeled using state space averaging. The system is a fourth order system which is non-linear due to the inherent switching involved in the circuit. The system is linearized around an operating point to study the system as a linear system. The control to output transfer function of the inverter is found to be non-minimum phase. The transfer functions are studied using root locus. From the control perspective, the presence of right half zero makes the design of the controller structure complicated. The PV cell is modeled using the cell equations in MATLAB. A maximum power point tracking (MPPT) technique is implemented to make sure the output power of the PV cell is always maximum which allows full utilization of the power from the PV cell. The perturb and observe (P&O) algorithm is the simplest and is used here. The use of this new inverter eliminates the various stages involved in the conventional solar micro inverter. Simulation and experimental results carried out on the setup validate the proposed structure of inverter.

Download or read book Single Stage Flyback Micro inverter for Solar Energy Systems written by Aniruddha Mukherjee and published by . This book was released on 2013 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solar energy systems based on photovoltaic (PV) cells have attracted considerable interest in recent years due to their promise of clear and seemingly limitless generated energy. Solar energy systems based on micro-inverter architectures are gaining in popularity as they are less prone to shading and PV cell malfunction since each solar panel in a system has its own low power inverter. A number of micro-inverters are single stage flyback inverters that are based on the DC-DC flyback topologies. There have been numerous papers on the topic of how to improve the efficiency of dc-dc flyback converters but as far as improving the efficiency of dc-ac flyback micro-inverter is concerned, comparatively less investigation on efficiency improvement has been performed. A low cost technique for improving the efficiency of a basic dc-ac flyback micro-inverter is proposed in the paper. The proposed efficiency improving technique is based on a simple snubber, consisting of just a few passive elements. In the thesis, the flyback micro-inverter with the passive snubber is presented; the modes of operation of the converter are discussed as well as the design of the converter with the passive snubber. Experimental results obtained from a lab prototype are presented as well. A second novel technique for improving the efficiency of a s ingle stage flyback micro-inverter is also proposed. The technique is based on combining the simple passive snubber with a variable frequency control zero-voltage switching (ZVS) technique. In the thesis, the operation of the micro-inverter with both the passive snubber and the ZVS III technique is explained and the design of the converter is discussed. Experimental results obtained from a lab prototype are presented to confirm the effectiveness of the both the techniques.

Download or read book DC DC Converter Topologies written by Gerry Moschopoulos and published by John Wiley & Sons. This book was released on 2024-01-31 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive look at DC-DC converters and advanced power converter topologies for all skills levels As it can be rare for source voltage to meet the requirements of a Direct Current (DC) load, DC-DC converters are essential to access service. DC-DC power converters employ power semiconductor devices (like MOSFETs and IGBTs) as switches and passive elements such as capacitors, inductors, and transformers to alter the voltage provided by a DC source into the necessary DC voltage as is required by a DC load. This source can be a battery, solar panels, fuel cells, or a DC bus voltage fed by rectified AC utility voltage. As the many components of DC-DC converters can be differently arranged into circuit structures called topologies, there are as many possible circuit topologies as there are possible combinations of circuit elements. Focusing on DC-DC switch-mode power converters ranging from 50 W to 10kW, DC-DC Converter Topologies provides a survey of all converter topology types within this power range. General principles are described for each topology type using a representative converter as an example. Variations that can be found that differ from the example are then examined, with a helpful discussion of comparisons when relevant. A broad range of topics is covered within the book, from simple, low-power converters to complex, high-power converters and everywhere in between. DC-DC Converter Topologies readers will also find: A detailed discussion of four key DC-DC converter topologies Description of isolated two-switch pulse-width modulated (PWM) topologies including push-pull, half-bridge, and interleaved converters An exploration of high-gain converters such as coupled inductors, voltage multipliers, and switched capacitor converters This book provides the tools so that a non-expert will be equipped to deal with the vast array of DC-DC converters that presently exist. As such, DC-DC Converter Topologies is a useful reference for electrical engineers, professors, and graduate students studying in the field.

Download or read book Experimental Verification of a Module Integrated Isolated Coupled Inductor Based Dc dc Boost Converter Fed Micro Inverter written by P. Geetha and published by . This book was released on 2016 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this paper, a photovoltaic module-integrated coupled inductor-based high-step-up dc-dc converter-fed isolated dc/ac converter is presented. The coupled-inductor-based dc-dc converters offer more advantages over the buck, boost, and cuk converters used in the photovoltaic (PV)-integrated applications. The proposed grid-integrated solar micro-inverter based on the isolated high-step-up dc-dc converter extracts the maximum power generated on the solar panel and it transfers the extracted power to the ac utility system through a voltage source inverter. High-step-up voltage gain, high maximum power point tracking accuracy, and high-energy-conversion efficiency can be obtained with the proposed topology. The design considerations and principle of operation of the proposed isolated high-step-up dc-dc boost-converter-fed micro-inverter are analyzed and discussed. The MATLAB/Simulink simulation and experimental results of the proposed micro-inverter have been presented to validate the performance of the isolated micro-inverter.

Download or read book Design and Implementation of a DSP Based Grid connected PV Inverter written by 張宏誠 and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Novel Single stage Inverter Topology written by Md Mahmud-Ul-Tarik Chowdhury and published by . This book was released on 2016 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt: Inverters are considered key components to enable the integration of renewable energy sources into the grid. These power processing circuits convert dc voltage into ac, and are needed in numerous applications, including residential photovoltaic (PV) systems. The state of the art inverters have several shortcomings such as limited voltage gain, low power density, high failure rates, and low efficiency. This thesis proposes a new inverter topology that can overcome the problems associated with most conventional inverters. The proposed inverter is a single stage configuration, and employs five semiconductor switches, in which one is operating at a high frequency and the rest are operating at the fundamental frequency of the load. The proposed inverter is capable of both stepping up and stepping down the voltage. This is a unique advantage over most state of the art single-stage inverters, which can either step up or step down the voltage. In the proposed inverter, a small capacitor transfers power from the input towards the output. The inverter is designed and controlled such that the required link capacitance is very low; therefore, film capacitors that have longer lifetime compared to electrolytic capacitors can be used. Unlike most conventional isolated inverters that use low frequency transformer (LFT), in the proposed inverter a high frequency transformer (HFT) can be used for providing galvanic isolation. This feature decreases the total size of the system. The proposed inverter can be modified slightly to offer soft-switching, which significantly increases the efficiency. In this thesis, the principles of the operation of the proposed inverter is studied, and its performance is evaluated through simulation and experiment.

Download or read book Three phase Transformerless Inverter for PV Grid Connected System with Zero Common Mode Noise written by Katia Karam and published by . This book was released on 2018 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: