"OBRIGADO DEUS PELA VIDA,PELA MINHA FAMILIA,PELO TRABALHO,PELO PÃO DE CADA DIA,PROTEGENOS DO MAL"
“SE SEUS PROJETOS FOREM PARA UM ANO,SEMEIE O GRÂO.SE FOREM PARA DEZ ANOS,PLANTE UMA ÁRVORE.SE FOREM PARA CEM ANOS,EDUQUE O POVO.”
“Sixty years ago I knew everything; now I know nothing; education is a progressive discovery of our own ignorance. Will Durant”
domingo, 19 de março de 2023
UNIVERSIDAD NACIONAL MAYOR DE SAN MARCOS La historia de Aldair Escobar Gutiérrez, el capitán de Selección de Taekwondo UNMSM-INGENIERIA ELECTRONICA-LIMA-PERU
segunda-feira, 27 de fevereiro de 2023
Robust Control of a Multi-phase Interleaved Boost Converter for Photovoltaic Application using μ-Synthesis Approach-by Badur Mueedh Alharbi University of Arkansas, Fayetteville
A dissertation submitted in partial fulfillment
of the requirements for the degree of
Doctor of Philosophy in Engineering with a concentration in Electrical Engineering
by
Badur Mueedh Alharbi University of Arkansas
Master of Science in Electrical Engineering, 2020
December 2020
University of Arkansas
ABSTRACT
The high demand of energy efficiency has led to the development power converter
topologies and control system designs within the field of power electronics. Recent advances of
interleaved boost converters have showed improved features between the power conversion
topologies in several aspects, including power quality, efficiency, sustainability and reliability.
Interleaved boost converter with multi-phase technique for PV system is an attractive area
for distributed power generation. During load variation or power supply changes due to the weather
changes the output voltage requires a robust control to maintain stable and perform robustness.
Connecting converters in series and parallel have the advantages of modularity, scalability,
reliability, distributed location of capacitors which make it favorable in industrial applications. In
this dissertation, a design of μ-synthesis controller is proposed to address the design specification
of multi-phase interleaved boost converter at several power applications. This thesis contributes to
the ongoing research on the IBC topology by proposing the modeling, applications uses and control
techniques to the stability challenges. The research proposes a new strategy of robust control
applied to a non-isolated DC/DC interleaved boost converter with a high step voltage ratio as
multi-phase, multi-stage which is favorable for PV applications. The proposed controller is
designed based on μ-synthesis technique to approach a high regulated output voltage, better
efficiency, gain a fast regulation response against disturbance and load variation with a better
dynamic performance and achieve robustness. The controller has been simulated using
MATLAB/Simulink software and validated through experimental results which show the
effectiveness and the robustness.
sábado, 31 de dezembro de 2022
태양전지 및 연료전지용 소용량 하이브리드 인버터 설계 및 구현 Design and Implementation of Hybrid Small-Sized Power Inverter for PV and Fuel Cell
Design and implementation of small-capacity hybrid inverters for solar cells and fuel cells
Author
Jo Sang-yoon
Seoul: Kwangwoon University Graduate School, 2019
Dissertation
Thesis (Doctoral)-- Kwangwoon University Graduate School: Department of Electrical Engineering 2019.2
Year of issue
2019
2018年12月7日
ABSTRACT
Design and Implementation of Hybrid
Small-Sized Power Inverter for PV and Fuel Cell
As a major source of power for robots and drones that emerged as key
elements of the Fourth Industrial Revolution era, solar cells, fuel cells, and
lithium-ion batteries are receiving spotlight as batteries that can produce
high power for long periods of time. Especially, the global market for solar
cells and fuel cells is expanding as new and renewable energy sources.
While inverter demand is essential for efficient operation of batteries and
studies of high-quality inverter technologies such as solar energy, energy
storage devices such as robots, drones, etc. As hybrid technologies that
supplement solar energy and fuel cells in battery power are
commercialized in the U.S., including Japan, it is imperative to study new
power converters and control technologies that add green power to
secondary batteries.
The purpose of this paper is to design and implement a small-capacity
hybrid inverter system for solar cells and fuel cells that efficiently operate
robots and controllers, communications and various mission equipment by
merging solar cells, fuel cells and lithium-ion batteries. To this end, the
electrical model for solar cells, fuel cells and lithium-ion batteries is first
established and the architecture of the hybrid inverter system is proposed
based on these models. After each component has been designed and
verified, the entire system is verified and finally the proposed smallcapacity
hybrid inverter system is demonstrated by mounting the actual
robot's power system.
This paper proposes the structure and function of hybrid inverter
systems by establishing an electrical equivalent linear model,
understanding the power characteristics of solar cells, fuel cells and
lithium-ion batteries with different principles of energy generation. Each
module proposes a new method of impedance matching maximum power
point tracking control technology that is essential to the design of the
buck converter for solar cells and fuel cells. It also designs an interleaved,
bidirectional DC-DC converter with a high-passing ratio for optimal
charging of lithium-ion batteries and proposes an efficiency analysis
method in the multiplier mode. In addition, it proposes a two-way DC-DC
converter that simultaneously takes into account efficiency and stability.
The proposed hybrid inverter system is implemented as a small-capacity
hybrid interver system for solar cells and fuel-cells by proving its
effectiveness through simulation and practical experiments at the module
and system level and by applying it to actual mobile robots.
In conclusion, the research proposed a small hybrid inverter system for
solar cells and fuel cells provides power conversion solutions suitable for
robots, drones, wearable devices, and mobile electronics. Futhermore,
Combined with other energy storage devices other than lithium-ion
batteries, it is also able to be applied as a power converter for large
capacity ESS. Therefore, it presents the possibility of independent
products as modules and system technologies for low-cost, long-term, and
high-power inverter technologies in the future renewable energy sector.
quarta-feira, 28 de dezembro de 2022
sábado, 3 de dezembro de 2022
Self-powered Sensor Monitoring System in Industrial Internet of Things using Off-resonance Piezoelectric Energy Harvesting Techniques by Jae Yong Cho -Dissertation for the degree of Doctor of Philosophy-Graduate School of Hanyang University-
Dissertation for the degree of Doctor of Philosophy Self-powered Sensor Monitoring System in Industrial Internet of Things using Off-resonance Piezoelectric Energy Harvesting Techniques
by Jae Yong Cho
Graduate School of Hanyang University
February 2019
Department of Electrical Engineering
Graduate School of Hanyang University
ABSTRACT
The main keyword in the era of the fourth industrial revolution is IIoT (Industrial
Internet of Things) that enables the interactive network between devices, vehicles, home
appliances, and other items embedded with electronics, software, sensors, actuators and etc.
To realize IIoT world, there are key technologies; sensors, microcontroller, connectivity,
and energy management. Especially, in terms of energy management, many researches
have been carried out about self-powering, a battery-less device from energy harvesting.
At the center, there is piezoelectric energy harvesting technology, which converts
mechanical energy into electrical energy. Lots of researches about piezoelectric energy
harvesting have been carried about because piezoelectric material has relatively high power
density and is easily applicable to various infrastructures like road, building, and factory
close to our daily lives. Ultimately, the goal of this technology is heading for energy saving
and simple installation of sensors used for monitoring structural condition without
inconveniences such as the replacement of the batteries and the complexity of the cables.
In this dissertation, the research about design and fabrication of off-resonance type
piezoelectric energy harvesting systems for IIoT sensor was discussed. Because the actual
frequency environment in a real field is not geared to resonant frequencies, previous
piezoelectric energy harvesting systems were difficult to harvest ambient energy efficiently.
We developed the techniques for harvesting energy efficiently through new structures of
off-resonance piezoelectric energy harvesters according to various frequency environment.
As the final step, the demonstration study was conducted to illustrate IIoT platform as V2I
(Vehicle to Infrastructure) system from the piezoelectric energy harvesting techniques. The
developed harvester was fabricated and installed on the highway (Yeoju-si, Gyeonggi-do,
South Korea). As a result, self-powered temperature sensor monitoring system was
constructed using the energy harvester to be able to operate wireless temperature sensor
(eZ430-RF2500, Texas Instruments, USA) without battery. Finally, the system was
established to inform a driver of the freezing condition on the road in advance as V2I
system.
First, the design and fabrication of the resonance dependent type energy harvester
were conducted. We have developed the piezoelectric energy harvester using wind that is
dependent on the resonant frequency, which is a key component of piezoelectric power
generation. The experiment result showed that the difference in power generation
characteristics when and when not at resonant frequencies makes difficult for the energy
harvester to be applied to actual industrial environments where frequencies vary. Finally, it
is essential to develop energy harvesters considering these diverse frequency environments.
Second, the studies of energy harvesters optimized for different types of frequency
environments in industries were conducted. The frequency environment was divided in four
conditions (single frequency, multi frequency, random frequency, and intermittent
frequency). For single, multi and random frequency conditions, a magneto-mechanical
system was applied as the method of harvesting more energy utilizing magnetic forces. For
an intermittent condition, system design was conducted as the method to overcome the offresonance
region. In single frequency environment, conveyor belts within a smart factory
were presented as an experimental environment and the study was conducted to overcome
an environment using magnets on the core belt that is much lower than the resonant
frequencies of a typical piezoelectric device. In multi frequency environment, water pipes
located in plants or buildings were presented as an experimental environment, and to
harvest more energy, a hybrid system using piezoelectric energy harvester and
electromagnetic energy harvester was studied. In a random frequency environment, the
railway was proposed as experimental condition and the magnetic pendulum energy
harvester utilizing inertial moments was developed. The energy harvester for the
intermittent frequency environment was studied, taking into account the wireless switch
that is sometimes pressed by humans as one of the intermittent frequency environments.
Third, the research was carried out on the energy harvesting circuit, which is essential
for applying the energy harvester to the actual IIoT environment. Preferentially, equivalent
circuit modeling of piezoelectricity and impedance matching study was conducted to
deliver maximum power. The DC-DC converter study was also conducted to convert high
voltage of the piezoelectricity into low voltage so that actual sensor applications can be
self-driven by the energy harvester. Additionally, the research was conducted to create the
desired output voltage, and finally to establish the wireless communication interface.
VIEW FULL THESIS: https://www.mediafire.com/file/41mjvvokgymxczk/Self-powered+Sensor+Monitoring+System+in+Industrial+Internet+of+Things+using+Off-resonance.pdf/file
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