Дисертації з теми "Microgrides"
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Moghimi, Mojtaba. "Modelling and Optimization of Energy Management Systems in Microgrids and Multi-Microgrids." Thesis, Griffith University, 2018. http://hdl.handle.net/10072/385882.
Повний текст джерелаThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Eng & Built Env
Science, Environment, Engineering and Technology
Full Text
Zhang, Fan. "Operation of Networked Microgrids in the Electrical Distribution System." Case Western Reserve University School of Graduate Studies / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=case1467974481.
Повний текст джерелаAwad, Bieshoy Awad Boutros. "Operation of Energy MicroGrids." Thesis, Cardiff University, 2010. http://orca.cf.ac.uk/54179/.
Повний текст джерелаHornik, Tomas. "Power quality in microgrids." Thesis, University of Liverpool, 2010. http://livrepository.liverpool.ac.uk/1456/.
Повний текст джерелаLevi, Patricia Janet. "Feasibility of grid compatible microgrids." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/108215.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 133-139).
There are 1.1 billion people in the world who lack access to electricity, mostly in rural areas. The expansion of the central grid has been slow in many developing countries, hampered by a lack of supply, poor finances, and politics. Distribution companies in these countries are often cash strapped, in a tremendous amount of debt and are unable to make adequate investments in infrastructure. Off-grid technologies can be the most cost-effective choice in remote areas, and they also can offer a solution for communities that will not receive reliable centralized electricity for many years. These solutions include solar home systems and microgrids. However, investment in microgrids has been discouraged by the risk of the central grid expanding into the service area of a microgrid. An attractive solution is to create technical standards for microgrids such that they are able to connect to the grid if or when it arrives, and to provide regulations for the integration of these systems into the operation of the main grid. This arrangement could reduce the risk to microgrid investors significantly. While existing literature speculates on the value of such a system, the costs and benefits have not been quantified. This analysis uses the Reference Electrification Model, a tool developed in collaboration by the Massachusetts Institute of Technology and IIT Comillas - Madrid, to assess the costs and benefits that might arise when using grid compatible microgrids. These results and an assessment of the regulatory context and forthcoming regulations show that grid compatible microgrids can provide significant social value, but only if supported by sufficient subsidies and a recognition of the costs imposed on society by depriving so many people of electricity.
by Patricia Janet Levi.
S.M. in Technology and Policy
Blasi, Bronson Richard. "DC microgrids: review and applications." Kansas State University, 2013. http://hdl.handle.net/2097/16823.
Повний текст джерелаDepartment of Architectural Engineering and Construction Science
Fred Hasler
This paper discusses a brief history of electricity, specifically alternating current (AC) and direct current (DC), and how the current standard of AC distribution has been reached. DC power was first produced in 1800, but the shift to AC occurred in the 1880’s with the advent of the transformer. Because the decisions for distribution were made over 100 years ago, it could be time to rethink the standards of power distribution. Compared to traditional AC distribution, DC microgrids are significantly more energy efficient when implemented with distributed generation. Distributed generation, or on-site generation from photovoltaic panels, wind turbines, fuel cells, or microturbines, is more efficient when the power is transmitted by DC. DC generation, paired with the growing DC load profile, increases energy savings by utilizing DC architecture and eliminating wasteful conversions. Energy savings would result from a lower grid strain and more efficient utilization of the utility grid. DC distribution results in a more reliable electrical service due to short transmission distances, high service reliability when paired with on-site generation, and efficient storage. Occupant safety is a perceived concern with DC microgrids due to the lack of knowledge and familiarity in regards to these systems. However, with proper regulation and design standards, building occupants never encounter voltage higher than 24VDC, which is significantly safer than existing 120VAC in the United States. DC Microgrids have several disadvantages such as higher initial cost due, in part, to unfamiliarity of the system as well as a general lack of code recognition and efficiency metric recognition leading to difficult certification and code compliance. Case studies are cited in this paper to demonstrate energy reduction possibilities due to the lack of modeling ability in current energy analysis programs and demonstrated energy savings of approximately 20%. It was concluded that continued advancement in code development will come from pressure to increase energy efficiency. This pressure, paired with the standardization of a 24VDC plug and socket, will cause substantial increases in DC microgrid usage in the next 10 years.
Yassuda, Yamashita Damiela. "Hierarchical Control for Building Microgrids." Thesis, Poitiers, 2021. http://www.theses.fr/2021POIT2267.
Повний текст джерелаRepresenting more than one-third of global electricity consumption, buildings undergo the most important sector capable of reducing greenhouse gas emissions and promote the share of Renewable Energy Sources (RES). The integrated RES and electric energy storage system in buildings can assist the energy transition toward a low-carbon electricity system while allowing end-energy consumers to benefit from clean energy. Despite its valuable advantages, this innovative distributed Building Microgrids (BM) topology requires significant changes in the current electric grid, which is highly dependent on grid energy policies and technology breakthroughs.The complexity of designing a robust Energy Management System (EMS) capable of managing all electric components inside the microgrid efficiently without harming the main grid stability is one of the greatest challenge in the development of BM. To mitigate the harmful effects of unpredictable grid actors, the concept of self-consumption has been increasingly adopted. Nonetheless, further technical-economic analysis is needed to optimally manage the energy storage systems to attain higher marks of self-consumption.Faceing these issues, the purpose of this doctoral thesis is to propose a complete framework for designing a building EMS for microgrids installed in buildings capable of maximising the self-consumption rate at minimum operating cost. Among all possible control architectures, the hierarchical structure has proved effective to handle conflicting goals that are not in the same timeframe. Hence, a Hierarchical Model Predictive (HMPC) control structure was adopted to address the uncertainties in the power imbalance as well as the trade-off between costs and compliance with the French grid code.Considering that buildings are not homogeneous and require solutions tailored to their specific conditions, the proposed controller was enhanced by two data-driven modules. The first data-driven algorithm is to handle inaccuracies in HMPC internal models. Without needing to tune any parameter, this algorithm can enhance the accuracy of the battery model up to three times and improve up to ten times the precision of the hydrogen storage model. This makes the building EMS more flexible and less dependent on pre-modelling steps.The second data-oriented algorithm determines autonomously adequate parameters to HMPC to relieve the trade-off between economic and energy aspects. Relying only on power imbalance data analysis and local measurements, the proposed hierarchical controller determines which energy storage device must run daily based on the estimation of the annual self-consumption rate and the annual microgrid operating cost. These estimations decrease microgrid expenditure because it avoids grid penalties regarding the requirements of annual self-consumption and reduces the degradation and maintenance of energy storage devices.The proposed EMS also demonstrated being capable of exploiting the potentials of shifting in time the charging of batteries of plug-in electric vehicles. The simulation confirmed that the proposed controller preferably charges electric vehicles’ batteries at periods of energy surplus and discharges them during periods of energy deficit, leading the building microgrid to reduce grid energy exchange. The results also showed that electric vehicle batteries' contribution depends on the size of the vehicle parking, their arrival and departure time, and the building’s net power imbalance profile. In conclusion, through simulations using the dataset of both public and residential buildings, the proposed hierarchical building EMS proved its effectiveness to handle different kinds of energy storage devices and foster the development of forthcoming building microgrids
Guo, Yuanzhen. "ECONOMIC OPERATION OF TYPICAL MICROGRIDS." UKnowledge, 2018. https://uknowledge.uky.edu/ece_etds/131.
Повний текст джерелаTUCCI, MICHELE. "Scalable control of islanded microgrids." Doctoral thesis, Università degli studi di Pavia, 2018. http://hdl.handle.net/11571/1214890.
Повний текст джерелаIn the recent years, the increasing penetration of renewable energy sources has motivated a growing interest for microgrids, energy networks composed of interconnected Distributed Generation Units (DGUs) and loads. Microgrids are self-sustained electric systems that can operate either connected to the main grid or detached from it. In this thesis, we focus on the latter case, thus dealing with the so-called Islanded microGrids (ImGs). We propose scalable control design methodologies for both AC and DC ImGs, allowing DGUs and loads to be connected in general topologies and enter/leave the network over time. In order to ensure safe and reliable operations, we mirror the flexibility of ImGs structures in their primary and secondary control layers. Notably, off-line control design hinges on Plug-and-Play (PnP) synthesis, meaning that the computation of individual regulators is complemented by local optimization-based tests for denying dangerous plug-in/out requests. The solutions presented in this work aim to address some of the key challenges arising in control of AC and DC ImGs, while overcoming the limitations of the existing approaches. More precisely, this thesis comprises the following main contributions: (i) the development of decentralized primary control schemes for load-connected networks (i.e. where local loads appear only at the output terminals of each DGU) ensuring voltage stability in DC ImGs, and voltage and frequency stability in AC ImGs. In contrast with the most commonly used control strategies available in the literature, our regulators guarantee offset-free tracking of reference signals. Moreover, the proposed primary local controllers can be designed or updated on-the-fly when DGUs are plugged in/out, and the closed-loop stability of the ImG is always preserved. (ii) Novel approximate network reduction methods for handling totally general interconnections of DGUs and loads in AC ImGs. We study and exploit Kron reduction in order to derive an equivalent load-connected model of the original ImG, and designing stabilizing voltage and frequency regulators, independently of the ImG topology. (iii) Distributed secondary control schemes, built on top of primary layers, for accurate reactive power sharing in AC ImGs, and current sharing and voltage balancing in DC ImGs. In the latter case, we prove that the desired coordinated behaviors are achieved in a stable fashion and we describe how to design secondary regulators in a PnP manner when DGUs are added/removed to/from the network. (iv) Theoretical results are validated through extensive simulations, and some of the proposed design algorithms have been successfully tested on real ImG platforms.
Lilla, Stefano <1969>. "Energy Management Systems of Microgrids." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amsdottorato.unibo.it/8778/1/Lilla_Stefano_Tesi.pdf.
Повний текст джерелаVogt, Thorsten [Verfasser]. "Multikriterielle Betriebsstrategien industrieller Microgrids / Thorsten Vogt." Paderborn : Universitätsbibliothek, 2019. http://d-nb.info/1203710771/34.
Повний текст джерелаMei, Jie S. M. Massachusetts Institute of Technology. "Applications of game theory in microgrids." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/118055.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 57-62).
A microgrid, which can be defined as a group of interconnected loads and distributed energy resources within clearly defined electrical boundaries that acts as a single controllable entity with respect to the grid, has been studied extensively in recent years. This paper will explore the application of non-cooperative game and cooperative game in microgrids. For an individual microgrid that is connected with renewable energy sources through DC-DC converters, a non-cooperative game theory based PI controller tuning method is proposed to help make more stable output voltage. For microgrids that are connected in network, a cooperative game theory based local energy exchange scheme is proposed to help them meet their energy requirements while achieving higher individual utility.
by Jie Mei.
S.M.
Sabhlok, Vikalp Pal. "Dynamics and challenges of microgrids implementation." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/80685.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (p. 64-69).
Microgrids have the capability of operating on an island mode as well as an integrated mode with the smart grid, depending on the requirement and objectives. Recently, microgrids projects have gained popularity both in developed world and developing world because of their ability to lower cost, increase resiliency and overall power quality. However, most of the studies on microgrids till now have focused on the technological challenges associated with design and implementation of microgrids. This study tries to develop an industry perspective on the recent development of microgrids. Several case studies from both developed world and developing world are explained to understand drivers, constraints and challenges of microgrid implementation. A generic model used by Weil and Utterback (2005) forms the basis for this study to develop a conceptual model, mapping different social, technological, market and regulatory factors which influence technology and industry evolution. The same model is used to develop a scenario analysis to predict future development of microgrids as a technology and as an industry.
by Vikalp Pal Sabhlok.
S.M.
Sam, Al-Attiyah. "Nested Microgrids: Operation and Control Requirement." Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-201088.
Повний текст джерелаNested Microgrids (nästlade mikronät) hänvisar till sammankoppling av flera mikronät i ettnätverk. De är anslutna via ett Nested Microgrid Network som bildar den elektriska kopplingenmellan dem och underlättar effektutbytet.I denna avhandling undersöks begreppet Nested Microgrids. Detta har resulterat ikonceptualisering av tre olika integreringsmetoder. Interaktion mellan mikronät i form avstyrenheter samt nödvändig datakommunikation analyseras också. Kontrollfunktionerna kommeratt skilja sig från ett normalt mikronät, och dessa diskuteras grundligt i denna rapport. Verkligaprojekt presenteras också.Funktionaliteten och implementeringen av de föreslagna styrfunktionerna verifieras medtidsdomänsimuleringar. Fyra styrfunktioner för mikronät undersöks i scenarier med NestedMicrogrids; Islanding, Resynchronization, Feeder Load Shed on Generator Overload och BlackStart. Olika kontrollstrategier och utbyte av information mellan mikronätens styrenheter föreslåsför stabil kapslade microgrids drift. Projektet ligger till grund för det framtida arbetet att utökateorin och tillämpa den i praktiska situationer.
Sampaio, Junior Adalberto Ribeiro. "Controle de microgrids dirigido por modelos." Universidade Federal de Goiás, 2014. http://repositorio.bc.ufg.br/tede/handle/tede/3859.
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Fundação de Amparo à Pesquisa do Estado de Goiás - FAPEG
The use of model driven engineering (MDE) and models at runtime represent an important tools for the development and management of complex systems. We show how a model driven approach can be used to create a manager able to control the various components of a microgrid, besides adding autonomic behavior in this kind of system. Applying an architecture that respects the hierarchy of controllers present in microgrids, we show how devices can be controlled through calls and events that are targeted to a manager and defined in its model. This model-driven approach facilitates the control of devices and allows customization of the bahavior of a microgrid by the end user in charge of managing it.
O uso de engenharia de software dirigida por modelos (MDE) e de modelos em tempo de execução constitui uma ferramenta importante para desenvolver e controlar sistemas complexos. Neste trabalho utilizamos uma abordagem dirigida por modelos para controlar sistemas de distribuição de energia elétrica conhecidos como microgrids. Mostramos como uma abordagem dirigida por modelos pode ser utilizada para criar um gerente capaz de controlar os diversos componentes de uma microgrid, além de adicionar comportamento autonômico neste tipo de sistema. Aplicando uma arquitetura que respeita a hierarquia dos controladores presentes em microgrids, mostramos como os dispositivos podem ser controlados por meio de chamadas e eventos direcionados ao gerente de recursos e definidos em seu modelo. Essa forma de controle dirigido por modelos facilita a definição do controle dos dispositivos de uma microgrid por parte do usuário, além de permitir uma personalização do comportamento global de uma microgrid.
Hurtt, James William. "Residential Microgrids for Disaster Recovery Operations." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/19242.
Повний текст джерелаMaster of Science
Chang, Chin-Yao. "Hierarchical Control of Inverter-Based Microgrids." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1471815065.
Повний текст джерелаYuan, Chen. "RESILIENT DISTRIBUTION SYSTEMS WITH COMMUNITY MICROGRIDS." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1480478081556766.
Повний текст джерелаBenahmed, Sif Eddine. "Distributed Cooperative Control for DC Microgrids." Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0056.
Повний текст джерелаIn recent years, the power grid has undergone a rapid transformation with the massive penetration of renewable and distributed generation units. The concept of microgrids is a key element of this energy transition. Microgrids are made up of a set of several distributed generation units (DGUs), storage units (SUs) and loads interconnected by power lines. A microgrid can be installed in several locations, for example in houses, hospitals, a neighborhood or village, etc., and operates either in connected mode to the main grid or in isolated (autonomous) mode. Microgrids are facing several challenges related to stability assurance, cyber-security, energy cost optimization, energy management, power quality, etc. In this work, we focus our attention on the control of islanded direct current microgrids. The main contribution is the design of a new distributed control approach to provably achieve current sharing, average voltage regulation and state-of-charge balancing simultaneously with global exponential convergence. The main tools are consensus in multi-agent systems, passivity, Lyapunov stability, linear matrix inequalities, etc. The thesis is divided into three parts. The First part presents the concept of microgrids, a literature review of their control strategies and the mathematical preliminaries required throughout the manuscript. The second part deals with the design of the proposed distributed control approach to achieve the considered objectives. The system is augmented with three distributed consensus-like integral actions, and a distributed-based static state feedback control architecture is proposed. Starting from the assumption that the agents (DGUs or SUs) have the same physical parameters, we provide proof of global exponential convergence. Moreover, the proposed control approach is distributed, i.e., each agent exchange relative information with only its neighbors through sparse communication networks. The proposed controllers do not need any information about the parameters of the power lines neither the topology of the microgrid. The control objectives are reached despite the unknown load variation and constant disturbances. In the third part, the proposed distributed controllers are assessed in different scenarios through Matlab/Simulink simulation and real-time Hardware-in-the-Loop experiment. The results show that the control objectives are successfully achieved, illustrating the effectiveness of the proposed control methodology
Ting, Sean. "Protection in Low Voltage DC Microgrids." Thesis, Ting, Sean (2017) Protection in Low Voltage DC Microgrids. Honours thesis, Murdoch University, 2017. https://researchrepository.murdoch.edu.au/id/eprint/38695/.
Повний текст джерелаMelly, Nicholas Kipchirchir. "Short-term solar forecasting for microgrids." Thesis, Melly, Nicholas Kipchirchir (2019) Short-term solar forecasting for microgrids. Masters by Coursework thesis, Murdoch University, 2019. https://researchrepository.murdoch.edu.au/id/eprint/51339/.
Повний текст джерелаFonkwe, Fongang Edwin. "Towards resilient plug-and-play microgrids." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/122685.
Повний текст джерелаThesis: Ph. D., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2019
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 159-164).
Microgrids have the potential to increase renewable energy penetration, reduce costs, and improve reliability of the electric grid. However, today's microgrids are unreliable, lack true modularity, and operate with rudimentary control systems. This thesis research makes contributions in the areas of microgrid modeling and simulation; microgrid testing and model validation; and advanced control design and tools in microgrids. These contributions are a step toward design, commissioning, and operation of resilient plug-and-play (pnp) microgrids, which will pave the way towards a more sustainable and electric energy abundant future for all.
"Facebook Inc. funded a portion of my PhD trajectory (2017 - 2019) by way of a Research Fellowship"
by Edwin Fonkwe Fongang.
Ph. D.
Ph.D. Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science
Weyrich, Morris Gregory. "On the benefits and costs of microgrids." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=114561.
Повний текст джерелаCette thèse êtudie les avantages que peuvent fournir aux intéressées les micro-réseaux, et propose une approche à l'évaluation des couts et bénéfices. Un cadre flexible est proposé pour classer les intéressés, les avantages, et la répartition des avantages. Une méthodologie est présentée pour évaluer quelques avantages clés, incluant: amélioration de fiabilité, fourniture des services auxiliaires, possibilité de différer les investissements requis par l'augmentation de la charge par la réduction de la charge de pointe, et la réduction des émissions perturbatrices. Enfin, quelques études de cas micro-réseaux existants sont présentées, sous la forme de cas d'aaires à l'aide de la méthodologie présentée. Ceci est fait afin d'illustrer l'estimation et l'allocation des avantages, et pour une meilleure compréhension de l'interaction entreles paramètres qui définissent un projet de micro-réseau et les avantages dont bénéficient chacun des intéssés.
Alibeik, Maryam. "Different configurations of microgrids and power converters." Thesis, Purdue University, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1573479.
Повний текст джерелаThis thesis proposes a two-phase microgrid system with voltages in quadrature. The two-phase microgrid system presents the following advantages: 1) constant power through the power line at balanced condition; 2) two voltages available by using a three-wire system; 3) optimized voltage utilization compared to a three-phase system; and 4) a direct connection of both symmetrical two-phase and single-phase machines. Power analysis and symmetrical components of this kind of microgrid have also been studied through this thesis. Besides the two-phase microgrid system, the hybrid DC/AC microgrid has been analyzed. Both hybrid DC/AC and two-phase microgrid need power interfaces such as power converters to be connected to the grid. Also two different types of power converters have been proposed and studied during this thesis.
Zhang, D. "Optimal design and planning of energy microgrids." Thesis, University College London (University of London), 2014. http://discovery.ucl.ac.uk/1418705/.
Повний текст джерелаLiu, Jianzhe. "On Control and Optimization of DC Microgrids." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1512049527948171.
Повний текст джерелаRen, Wei. "The feasibility of microgrids for large facilities." Kansas State University, 2017. http://hdl.handle.net/2097/35482.
Повний текст джерелаDepartment of Architectural Engineering and Construction Science
Fred L. Hasler
Typical building power supplied from power plants has significantly evolved over the last century. After power is generated and transferred from the power plant, it is distributed to the customer. The concept of Microgrid was introduced to address increasing concerns with power reliability requirements for some facilities. The Microgrid is a localized electric grid that can operate autonomously from the traditional electric grid (Macrogrid). Compared with generator sets, a Microgrid provides a faster system response and recovery to either whole or part of the electric load for a facility. The Microgrid can operate under two operation conditions: grid-tied mode and island mode. When it is working individually like an “island”, the system is not providing or receiving disturbance to or from the Macrogrid. The purpose of this paper is to give a detailed introduction of Microgrid and present research and conclusion about its feasibility. This report references previously published research to explain what a Microgrid is. Also, two detailed case studies provide a discussion about the feasibility of the Microgrid in terms of its reliability, economics and environmental impact - air quality. Although there are many challenges that Microgrids are facing, there are quite a number of reasons to consider them. The goal is to balance the benefits and challenges of Microgrids depend on each case. No doubt, the existing power grid will still provide the majority of power supply for global population. However, many companies and government-funded laboratories are investing time and money into research and development of Microgrids. With the advancement of the Microgrids, it is likely that Microgrids will be playing a larger role in providing secure, reliable energy to the building industry.
Vijayaragavan, Krishna Prasad. "Feasibility of DC microgrids for rural electrification." Thesis, Högskolan Dalarna, Energiteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:du-25850.
Повний текст джерелаHuang, Po-Hsu. "Systematic control strategy for inverter-based microgrids." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/121612.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 121-125).
Small-scale power systems, microgrids (MGs), are becoming economically and technically feasible due to cost-effective battery storage with high-bandwidth inverter interfaces, thus facilitating efficient energy utilization from renewable sources to maintain autonomous operation without a grid connection. Therefore, control of inverter-based or inverter-dominant systems is gaining a lot of attention while posing different challenges compared to traditional power systems. Conventional droop-based control architectures can provide power-sharing capability, and are considered to be a cost-effective and reliable solution for microgrids. However, experimental studies have revealed that for small-scale microgrids, stability is significantly compromised by the droop control due to low X/R ratios and short lines. Therefore, a proper modeling framework for obtaining concise and accurate models becomes important to understand the physical nature of the instability. Such a framework can further facilitate a systematic control design for stability enhancement, allowing the development of power-sharing strategies and plug-and-play functionality for efficient microgrid operation. In this thesis, high-fidelity reduced-order models for microgrids are first developed and investigated. Then, based on the proposed models, concise and simple stability certificates are derived along with virtual impedance methods for local and global stability enhancement. Detailed discussions are carried out on the control design that aims at achieving both droop stability and controller robustness. Finally, a power and energy management scheme based on secondary compensation is developed to enhance operational efficiency. The integrated solution provides a comprehensive reference for the development of stable, reliable, and flexible inverter-based microgrids. All results are validated through both simulation and experimental studies.
by Po-Hsu Huang.
Ph. D.
Ph.D. Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science
Benamane, Siad Sabah. "DC Microgrids Control for renewable energies integration." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLE006.
Повний текст джерелаThe large penetration intermittent energy sources, presents a new challenges to power systems' stability and reliability; we consider in this work their connection through a Direct Current (DC) MicroGrid and a hybrid storage system, in order to satisfy constraints of connection to the network (the so-called Grid-Codes). The main objective here is to design a system that can fulfil these requirements and allow us to attain a Plug and Play behaviour; this approach is based on the “System of Systems philosophy'' using distributed control methodologies.This thesis constitutes a contribution for DC MicroGrid control and introduces a rigorous dynamics' analysis.. The stabilization of the system is based on storage devices: batteries for energy balance and long term response of power flow, while supercapacitors deal with power balance and fast response.First it will be presented the analysis of the DC MicroGrid which control is designed based on detailed models of energy sources and storage systems. This grid may present an unstable behaviour created by the source’s intermittent output power, switching ripples from the power converters and their power electronic and oscillatory currents produced by some types of loads. Therefore the system is subject to both fast and slow variations. The stabilization of such systems will be based on the operation of different technologies of storage, such as battery and supercapacitor, in different time scales.We propose a hierarchical control scheme, based on nonlinear control theory, in particular Lyapunov, backstepping and input/output feedback linearization. The proposed DC MicroGrid and its control are then verified both by computer simulations and by experiments. The results show the good performance of the system under variations on production and on consumption
Волчан, Дмитро Вячеславович. "Система управління мережею MicroGrid". Bachelor's thesis, КПІ ім. Ігоря Сікорського, 2020. https://ela.kpi.ua/handle/123456789/39369.
Повний текст джерелаGoal: improve the efficiency of Microgrid network management by improving the solar power management system for real time operation. This paper provides an overview of smart grids, their role and interaction with existing grids. It discusses the various methods and systems for managing the MicroGrid network, analyzes, characterizes, and compares them, and describes the main layers of MicroGrid network management. The main advantages of solar energy management over other sources of energy in the MicroGrid network are analyzed. The algorithm for determining the position of the sun is investigated and the influence of real-time weather conditions is taken into account. It is shown that this method increases the efficiency of the energy storage system in comparison with traditional energy management systems.
Yii, See Mee. "Microgrid with distributed generators." Thesis, Yii, See Mee (2009) Microgrid with distributed generators. Other thesis, Murdoch University, 2009. https://researchrepository.murdoch.edu.au/id/eprint/3250/.
Повний текст джерелаAlotibe, Mohammad. "Microgrid: modelling and control." Thesis, Alotibe, Mohammad (2010) Microgrid: modelling and control. Other thesis, Murdoch University, 2010. https://researchrepository.murdoch.edu.au/id/eprint/4065/.
Повний текст джерелаPaniagua, Sánchez-Mateos Jesús. "Reliability-Constrained Microgrid Design." Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-187715.
Повний текст джерелаRoss, Michael. "Energy storage system scheduling in wind-diesel microgrids." Thesis, McGill University, 2010. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=95237.
Повний текст джерелаCette thèse propose un système expert avec une base de connaissance qui peut être utilisé comme un contrôleur lors de la charge et de la décharge d'un système de stockage d'énergie dans un micro-réseau éolien-diesel. Un micro-réseau éolien-diesel modèle est établi, et un stockage est installé pour tester les fonctionnalités du contrôleur en utilisant des valeurs de la puissance horaire. Les résultats sont comparés avec une optimisation utilisant 24 heures de valeurs en avance pour la vitesse du vent, et aussi avec un contrôleur basé sur un réseau de neurones artificiels. Le contrôleur système expert est ensuite utilisé pour analyser les coûts d'énergie d'une analyse paramétrique, en variant la pénétration du vent, la puissance nominale du stockage, et la capacité nominale du stockage. Cette analyse indique pour quelles valeurs de pénétration éolienne une mise en vre d'un stockage serait viable économiquement et techniquement. Différentes technologies de stockage sont testées afin de déterminer laquelle serait le mieux adapté pour cette application particulière. Les systèmes de stockage sont réalisés à l'aide d'un ou de plusieurs types de systèmes, et le contrôleur système expert est modifié en conséquence, afin de déterminer s'il y a des avantages à avoir ce type de stockage. Ces analyses montrent aussi que le contrôleur système expert a la capacité et la flexibilité de s'adapter à des technologies ainsi qu'à des micro-réseaux de différents types.
Paquette, Andrew Donald. "Power quality and inverter-generator interactions in microgrids." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/51803.
Повний текст джерелаOjeda, Alejandro P. "A load shedding scheme for inverter based microgrids." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/66450.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (p. 71-72).
Over the last decade, penetration of microgrids containing distributed generation (DG) sources has increased in grid distribution systems. This requires the stable operation of microgrids when connected to the distribution system as well as during islanding. Islanding that is fault provoked is more likely to cause unstable microgrid operation than planned islanding. During fault provoked islanding, unstable operation is exacerbated when induction motor (IM) loads are present. Using the MATLAB simulation tool SimPowerSystems, an inverter-based microgrid model connected to the IEEE-13 distribution system was created. A load shedding scheme was developed in order to improve microgrid stability during fault provoked islanding conditions.
by Alejandro P. Ojeda.
M.Eng.
Fero, Allison. "A scalable architecture for the interconnection of microgrids." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/115007.
Повний текст джерелаThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 789-84).
Electrification is a global challenge that is especially acute in India, where about one fifth of the population has no access to electricity. Solar powered microgrid technology is a viable central grid alternative in the electrification of India, especially in remote areas where grid extension is cost prohibitive. However, the upfront costs of microgrid development, coupled with inadequate financing, have led to the implementation of small scale, stand alone systems. Thus, the costs of local generation and storage are a substantial barrier to acquisition of the technology. Furthermore, the issues of uncertainty, intermittency, and variability of renewable generation are daunting in small microgrids due to lack of aggregation. In this work, a methodology is provided that maximizes system-wide reliability through the design of a computationally scalable communication and control architecture for the interconnection of microgrids. An optimization based control system is proposed that finds optimal load scheduling and energy sharing decisions subject to system dynamics, power balance constraints, and congestion constraints, while maximizing network-wide reliability. The model is first formulated as a centralized optimization problem, and the value of interconnection is assessed using supply and demand data gathered in India. The model is then formulated as a layered decomposition, in which local scheduling optimization occurs at each microgrid, requiring only nearest neighbor communication to ensure feasibility of the solutions. Finally, a methodology is proposed to generate distributed optimal policies for a network of Linear Quadratic Regulators that are each making decisions coupled by network flow constraints. The LQR solution is combined with network flow dual decomposition to generate a fully decomposed algorithm for finding the dynamic programming solution of the LQR subject to network flow constraints.
by Allison Fero.
S.M. in Technology and Policy
Cavanagh, Kathleen Alison. "Stability-constrained design for low voltage DC microgrids." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/120235.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 91-93).
Microgrids are a promising solution to reducing the energy access gap. However, microgrids are inherently fragile systems as they are not globally stable. This thesis considers two voltage instabilities that can arise in DC microgrids as a result of tightly controlled loads in the presence of inductive delays. First, we examine the instability that arises when a constant power load is added to or removed from a network where the topology is unknown. While removing the dependence of the stability certificate on the interconnection structure creates a major technical challenge, it is beneficial as it allows for ease in network modification as the needs of a community vary. We thus develop conditions on individual power sources and loads such that a network comprised of many arbitrarily-connected units will be stable. We use Brayton-Moser potential theory to develop design constraints on individual microgrid components that certify transient stability-guaranteeing that the system will return to a suitable equilibrium after a change to the overall network loading. We find that stability can be guaranteed by installing a parallel capacitor at each constant power load, and we derive an expression for the required capacitance. Second, we analyze the small-signal instabilities in microgrids containing arbitrary, rather than constant power, loads. This network representation allows for a more accurate representation of DC loads controlled by power converters which have a destabilizing negative incremental impedance over a finite frequency band in contrast to constant power loads which have a negative incremental impedance over all frequencies. While there are many established methods for the small-signal stability certification of DC networks, these methods do not explicitly account for the influence of network. In contrast, we develop a method for stability assessment of arbitrary DC grids by introducing the Augmented Power Dissipation and showing that it's positive definiteness is a sufficient condition for stability. We present an explicit expression for this quantity through load and network impedances and show how it could be directly used for stability certification of complex networks.
by Kathleen Alison Cavanagh.
S.M.
Li, Xinyao. "Enhanced control and protection for inverter dominated microgrids." Thesis, University of Strathclyde, 2014. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=23510.
Повний текст джерелаFeroze, Hassan. "Multi-Agent Systems in Microgrids: Design and Implementation." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/34687.
Повний текст джерелаMaster of Science
Alqahtani, Ayedh H. A. S. "Modeling and Control of Photovoltaic Systems for Microgrids." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1381786869.
Повний текст джерелаCingoz, Fatih. "EFFECTIVE POWER MANAGEMENT FOR AUTONOMOUS OPERATIONS OF MICROGRIDS." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1469038927.
Повний текст джерелаForel, Alexandre. "Distributed Model Predictive Operation Control of Interconnected Microgrids." Thesis, KTH, Reglerteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-206145.
Повний текст джерелаFörnybara energikällor har ökat under senaste åren. Det innebär nya utmaningar förevolutionen av elektriska nät. Microgrids är en bottom-up ansats för produktion ochintegrering av förnybar energi.Energiförsörjning av flera sammankoppladeMicrogrids studeras in detta arbete genommodellbaserad prediktiv kontroll (MPC). Ett optimeringsproblem formuleras på de enskildaenheterna med Alternating DirectionMethod ofMultipliers (ADMM) och parallellberäkningar härledas.Microgrids samarbetar för att nå en global lösning av neighbourto-neighbour kommunikation.Distribuerad energiförsörjning av microgrids analyseras och två kontroll algorithmerutformas.
Zhang, Xiaotian. "Modelling and control of power inverters in microgrids." Thesis, University of Liverpool, 2012. http://livrepository.liverpool.ac.uk/8073/.
Повний текст джерелаAmbia, Mir Nahidul. "Advanced control of multi-microgrids for grid integration." Thesis, The University of Sydney, 2021. https://hdl.handle.net/2123/25722.
Повний текст джерелаShoeb, Md Asaduzzaman. "Optimal operation and control of remote area microgrids." Thesis, Shoeb, Md Asaduzzaman ORCID: 0000-0002-6653-107X (2019) Optimal operation and control of remote area microgrids. PhD thesis, Murdoch University, 2019. https://researchrepository.murdoch.edu.au/id/eprint/54118/.
Повний текст джерелаWang, J. "The control of grid-connected inverters in microgrids." Thesis, University of Liverpool, 2016. http://livrepository.liverpool.ac.uk/3001702/.
Повний текст джерелаPashajavid, Ehsan. "Stable Overload Management Schemes for Isolated Coupled Microgrids." Thesis, Curtin University, 2017. http://hdl.handle.net/20.500.11937/59064.
Повний текст джерелаAbdelrazek, Ahmed Abdelhakim Moustafa. "Transformerless Grid-Tied Impedance Source Inverters for Microgrids." Doctoral thesis, Università degli studi di Padova, 2018. http://hdl.handle.net/11577/3427190.
Повний текст джерела