Analysis And Simulation Of Power Mismatch Control In Grid Connected Pv System With N Port Converter

In recent years, there have been international commitments to reduce emissions associated with conventional energy were made. Renewable energy has been gaining ground, and is seen to occupy a prominent place in the global power generation. In this context, solar photovoltaic generation systems have the opportunity to be as much as suitable to produce electrical energy very close to the electric loads. Power electronics forms a major role in connecting PV systems into grid. Multilevel converters have been increasingly used in these systems to take care of high voltage levels and reduced harmonic distortion. In this thesis, power mismatch in N-port converter system that consists of a dual active bridge (DAB) dc-dc converter and a multilevel cascaded H-bridge dc-ac inverter is analyzed, modelled and simulated with in LabView ® and Simulink®. The d-q axis current control method is developed and simulation results are presented. This control design is built to control the grid current and Capacitor voltage balancing is simulated in Matlab®/Simulink® and LabView ® by using the average model approach. Additionally, Pulse Width Modulation (PWM) techniques for H-bridge and cascaded H-bridge have been analyzed and modelled in LabView®.

The renewable energy sources such as wind, solar, and fuel cell are needed to produce electric energy to meet increasing demand on energy, shortage of fossil fuels, and global concern about fossil emission levels. Specifically solar energy has seen tremendous growth because of its several advantages such as being pollution free, little maintenance, emitting no noise and, long life time. Grid connected solar photovoltaic (PV) systems have great potential to be a distributed power source because of their modular characteristics and ease of installation. In 2011 more than 62,500 PV systems have been interconnected by utilities in the US, and the forecasts show that this number will increase to over 150,000 in 2015. Power electronics forms a major role in connecting PV systems into grid. Multilevel converters have been increasingly used in these systems to take care of high voltage levels and reduced harmonic distortion. There are some different multilevel topologies, and applications. In this thesis, a cascaded multilevel H-bridge inverter as a part of N-port multilevel converter is developed and analyzed to integrate PV system into grid. This N-port multilevel converter uses dual active bridge (DAB) converters as a front-end DC to DC converter to control power to grid and cascaded multilevel H-bridge (CHB) as a DC to AC inverter. The average model of DAB and CHB converters is developed in MATLAB ® /Simulink ® and power electronics simulation software PSIM® . A system level controller is designed which includes P&O maximum power point tracking (MPPT) for the PV, and d-q axis grid current controller for the CHB inverter. In addition the phase-shift sinusoidal PWM is developed to the 11-level CHB. The entire N-port converter system for three phases with 15 ports is modelled in PSIM ® and the controller performance is verified.

New smart power grids apply automatically controlled power systems that require a modernization of existing technologies. Renewable energy systems such as Photovoltaic power plants convert solar energy into electricity. Conventional 60Hz transformers in such systems can be replaced by novel power converter systems, which reduce production costs, size, and improve efficiencies. This thesis presents a power interface for a large scale solar power plant, utilizing an innovative power balance and fault tolerance control to feed electricity reliably and efficiently to the medium voltage 13.8kV utility grid. This interface consists of a multi-port converter configuration which achieves a high power DC-AC conversion. Each port consists of an array of PV solar panels, a multi-level dual active bridge, a neutral point clamped inverter, and a connection circuit to the grid. This combination of ports is arranged for a three phase output. A connection to the grid entails a system level controller, which can be achieved by a voltage and current balancing control, using a nonlinear concept with integrated feedback loops. Autonomous operation requires the establishment of a fault-tolerant control algorithm, attained by a continuously monitored fault detection circuit. A novel multi-port control is proposed to realize a voltage, current and fault control strategy among cascaded ports. This control is verified in Matlab/Simulink; detailed analysis and simulation results are provided.

This book gathers outstanding papers presented at the 16th Annual Conference of China Electrotechnical Society, organized by China Electrotechnical Society (CES), held in Beijing, China, from September 24 to 26, 2021. It covers topics such as electrical technology, power systems, electromagnetic emission technology, and electrical equipment. It introduces the innovative solutions that combine ideas from multiple disciplines. The book is very much helpful and useful for the researchers, engineers, practitioners, research students, and interested readers.

A thorough and authoritative discussion of how to use fault analysis to prevent grid failures In Fault Analysis and its Impact on Grid-Connected Photovoltaic Systems Performance, a team of distinguished engineers delivers an insightful and concise analysis of how engineers can use fault analysis to estimate and ensure reliability in grid-connected photovoltaic systems. The editors explore how failure data can be used to identify how power electronics-based power systems operate and how they can help to perform risk analysis and reduce the likelihood and frequency of failure. The book explains how to apply different fault detection techniques—including signal and image processing, fault tolerant approaches—and explores the impact of faults in grid-connected photovoltaic systems. It offers contributions from noted experts in the field and is fully updated to include the latest technologies and approaches. Readers will also find: A failure mode effect classification approach for distributed generation systems and their components Explanations of advanced machine learning approaches with significant market potential and real-world relevance A consideration of the issues pertaining to the integration of power electronics converters with distributed generation systems in grid-connected environments Treatments of IoT-based monitoring, ageing detection for capacitors, image and signal processing approaches, and standards for failure modes and criticality analyses Perfect for manufacturers and engineers working in the power electronics-based power system and smart grid sectors, Fault Analysis and its Impact on Grid-Connected Photovoltaic Systems Performance will also earn a place in the libraries of distributed generation companies facing issues in operation and maintenance.

This book narrates an assessment of numerous advanced power converters employed on primitive phase to enhance the efficiency of power translation pertaining to renewable energy systems. It presents the mathematical modelling, analysis, and control of recent power converters topologies, namely, AC/DC, DC/DC, and DC/AC converters. Numerous advanced DC-DC Converters, namely, multi-input DC-DC Converter, Cuk, SEPIC, Zeta and so forth have been assessed mathematically using state space analysis applied with an aim to enhance power efficiency of renewable energy systems. The book: Explains various power electronics converters for different types of renewable energy sources Provides a review of the major power conversion topologies in one book Focuses on experimental analysis rather than simulation work Recommends usage of MATLAB, PSCAD, and PSIM simulation software for detailed analysis Includes DC-DC converters with reasonable peculiar power rating This book is aimed at researchers, graduate students in electric power engineering, power and industrial electronics, and renewable energy.

This textbook is intended for engineering students taking courses in power electronics, renewable energy sources, smart grids or static power converters. It is also appropriate for students preparing a capstone project where they need to understand, model, supply, control and specify the grid side power converters. The main goal of the book is developing in students the skills that are required to design, control and use static power converters that serve as an interface between the ac grid and renewable power sources. The same skills can be used to design, control and use the static power converters used within the micro-grids and nano-grids, as the converters that provide the interface between such grids and the external grid. The author’s approach starts with basic functionality and the role of grid connected power converters in their typical applications, and their static and dynamic characteristics. Particular effort is dedicated to developing simple, concise, intuitive and easy-to-use mathematical models that summarize the essence of the grid side converter dynamics. Mathematics is reduced to a necessary minimum, solved examples are used extensively to introduce new concepts, and exercises are used to test mastery of new skills.

This book presents advanced control techniques that use neural networks to deal with grid disturbances in the context renewable energy sources, and to enhance low-voltage ride-through capacity, which is a vital in terms of ensuring that the integration of distributed energy resources into the electrical power network. It presents modern control algorithms based on neural identification for different renewable energy sources, such as wind power, which uses doubly-fed induction generators, solar power, and battery banks for storage. It then discusses the use of the proposed controllers to track doubly-fed induction generator dynamics references: DC voltage, grid power factor, and stator active and reactive power, and the use of simulations to validate their performance. Further, it addresses methods of testing low-voltage ride-through capacity enhancement in the presence of grid disturbances, as well as the experimental validation of the controllers under both normal and abnormal grid conditions. The book then describes how the proposed control schemes are extended to control a grid-connected microgrid, and the use of an IEEE 9-bus system to evaluate their performance and response in the presence of grid disturbances. Lastly, it examines the real-time simulation of the entire system under normal and abnormal conditions using an Opal-RT simulator.

This thesis analyzes the technical and economic potential of autonomous voltage control strategies for improving distribution grid operation with high shares of photovoltaic (PV) generation. Key issues include: The simultaneity of local photovoltaic generation and local consumption as well as its influence on reverse power flows.The theoretical potential of autonomous voltage control strategies to increase a grid’s hosting capacity for additional photovoltaic generation.Stability analyses of a voltage-dependent combined active and reactive power control strategy for photovoltaic inverters.The cost savings potential (CAPEX & OPEX) of autonomous voltage control strategies, compared to traditional grid reinforcement measures. The results suggest that autonomous voltage control strategies can be used to improve the technical and economic distribution grid integration of PV systems. If applied appropriately, these strategies are capable of deferring grid reinforcement measures and hence shifting investment costs to future points in time. Of all investigated autonomous voltage control strategies, the on-load tap changer voltage control and a combined Q(V)/P(V) PV inverter control strategy showed the most promising results, from a technical and an economic perspective.

This book covers advancements of power electronic converters and their control techniques for grid integration of large-scale renewable energy sources and electrical vehicles. Major emphasis is on transformer-less direct grid integration, bidirectional power transfer, compensation of grid power quality issues, DC system protection and grounding, interaction in mixed AC/DC systems, AC and DC system stability, design of high-frequency high power density systems with advanced soft magnetic materials, modeling and simulation of mixed AC/DC systems, switching strategies for enhanced efficiency, and protection and reliability for sustainable grid integration. This book is an invaluable resource for professionals active in the field of renewable energy and power conversion. Md. Rabiul Islam received his PhD from the University of Technology Sydney (UTS), Australia. He was appointed as a Lecturer at Rajshahi University of Engineering & Technology (RUET) in 2005 and promoted to full-term Professor in 2017. In early 2018, he joined the School of Electrical, Computer, and Telecommunications Engineering, University of Wollongong, Australia. He is a Senior Member of IEEE. His research interests include the fields of power electronic converters, renewable energy technologies, power quality, electrical machines, electric vehicles, and smart grids. He has authored or coauthored more than 200 publications including 50 IEEE Transactions/IEEE Journal papers. He has been serving as an editor for IEEE Transactions on Energy Conversion and IEEE Power Engineering Letters, and associate editor for IEEE Access. Md. Rakibuzzaman Shah is a Senior Lecturer with the School of Engineering, Information Technology and Physical Science at Federation University Australia. He has worked and consulted with distribution network operators and transmission system operators on individual projects and has done collaborative work on a large number of projects (EPSRC project on multi-terminal HVDC, Scottish and Southern Energy multi-infeed HVDC) - primarily on the dynamic impact of integrating new technologies and power electronics into large systems. He is an active member of the IEEE and CIGRE. He has more than 70 international publications and has spoken at the leading power system conferences around the world. His research interests include future power grids (i.e., renewable energy integration, wide-area control), asynchronous grid connection through VSC-HVDC, application of data mining in power system, distribution system energy management, and low carbon energy systems. Mohd. Hasan Ali is currently an Associate Professor with the Electrical and Computer Engineering Department at the University of Memphis, USA, where he leads the Electric Power and Energy Systems (EPES) Laboratory. His research interests include advanced power systems, smart-grid and microgrid systems, renewable energy systems, and cybersecurity issues in modern power grids. Dr. Ali has more than 190 publications, including 2 books, 4 book chapters, 2 patents, 60 top ranked journal papers, 96 peer-reviewed international conference papers, and 20 national conference papers. He serves as the editor of the IEEE Transactions on Sustainable Energy and IET-Generation, Transmission and Distribution (GTD) journal. Dr. Ali is a Senior Member of the IEEE Power and Energy Society (PES). He is also the Chair of the PES of the IEEE Memphis Section.