Parallel Operation of Inverters with Seamless transfer for Energy Storage System Jung,AhJin

Parallel Operation of Inverters with Seamless transfer
for Energy Storage System

Jung,AhJin
(SupervisorChoi,SeWan)
Dept.ofControlandInstrumentationEng.
Graduate School Seoul National University of
ScienceandTechnology


Recently,integrating are new able energy source,such as solar energy or
wind power, to distributed generation microgrid is widely developed
nowadays.The cost and efficiency of the system may be taking into
accountas an important consideration.A large powersystem consists of
several parallel inverters which work redundantly,in order to keep the
reliability of the system. In addition, several same capacity parallel
inverters may be operated as modular inverters,that may have lower
operation cost.In modular inverter operation,the load sharing between
inverters must be considered. Furthermore, the transition between
grid-connected and stand-alone mode may causing bad influence to the
critical load.
In this paper,a master-slave control algorithm with seamless transfer
during mode transition of modular parallel inverter as PCS for ESS is
proposed.

FOTOGRAFIAS INAUGURAÇÃO SHOW ROOM EQUIPAMENTOS SMS-LEGRAND-06-11-2014 SAO PAULO BRASIL

LINK ALBUM SHOW ROOM SMS LEGRAND
https://plus.google.com/photos/111424134529259305519/albums/6078754595834403345


PARABENS AO EMPRESA SMS LEGRAND PELA GRANDE INAUGURAÇÃO DE SEU SHOW ROOM DE EQUIPAMENTOS CONDICIONADORES DE ENERGIA ,ESTABILIZADORES,UPS,QUADROS DE DISTRIBUIÇÃO ELETRICOS,INFRAESTRUTURA DE TI,FOI UMA GRANDE ALEGRIA VISITAR APOS MUITO ANOS,EU TIVE A GRANDE SATISFAÇÃO DE SER PARTE DO GRUPO DE ENGENHARIA DE DESENVOLVIMENTO E PESQUISA NO PERIODO DE (1998-2005),TAMBEM VERIFIQUE QUE O PRODUTO SINUS DOBLE LP NO QUAL TIVE A HONRA DE DESENVOLVER JUNTO COM MEU EQUIPE DE ENGENHARIA AINDA ESTA EM LINHA DE PRODUÇÃO,DESEJO MUITOS EXITOS.

Sistema de geração distribuida fontes CA e CC conectado a rede monofasica e controle eletronico da qualidade da energia eletrica Ricardo Quadros Machado : Faculdade de Engenharia Elétrica e de Computação - FEEC-UNICAMP-BRASIL

Título [Principal]: Sistema de geração distribuida fontes CA e CC conectado a rede monofasica e controle eletronico da qualidade da energia eletrica
Título [Outro Idioma]: Distribution generator systems with AC and DC sources connected to a single-hase feeder and electronic control of the power quality
 Autor(es): Ricardo Quadros Machado

Resumo: Resumo: Esta tese apresenta uma nova forma de conexão direta entre um gerador de indução trifásico e uma rede monofásica, situação típica de ambientes rurais, com possibilidade de geração local de energia. O funcionamento do sistema prevê que seja garantida ao usuário local energia elétrica de boa qualidade. Por energia de boa qualidade entende-se: tensões senoidais e equilibradas, freqüência fixa e boa regulação de tensão. Para a rede monofásica, controla-se o fluxo de potência de modo que o fator de potência resultante seja unitário. A obtenção destes comportamentos se dá com o uso de um conversor CC-CA PWM trifásico, conectado em derivação no ponto de acoplamento das cargas locais. Por este conversor flui uma parcela da potência da carga relacionada com desequilíbrios e distorções. A maior parte da potência ativa não precisa ser processada pelo conversor, o que dá a esta solução um rendimento maior do que se obtém com as alternativas de dupla conversão. O sistema completo de geração distribuída pode receber energia, da geração CA (gerador de indução), de uma fonte CC (células a combustível, painéis fotovoltáicos ou bancos de baterias) conectada ao barramento CC do conversor PWM ou da rede monofásica. No caso de alimentação apenas pela rede, tem-se uma estrutura de conversão mono-trifásica interativa com a linha.
LINK
http://www.bibliotecadigital.unicamp.br/document/?code=vtls000343206

Steady State and Dynamic Modeling of the Solar Cell and Evaluation on the Effects of Inverter Ripple Current KIM,WOOK Department of Electrical Engineering Graduate School Soongsil University

Steady State and Dynamic Modeling of  the
Solar Cell and Evaluation on the Effects of
Inverter Ripple Current

KIM,WOOK
Department of Electrical Engineering
Graduate School
Soongsil University
ABSTRACT
In order to develop precise solar cell simulators or design a high
performance photovoltaic generation system, it is important to
accurately understand physical properties of solar cells. But the
steady state model of the solar cell have a non-linear form with
many parameters entangled and conventional methods suggested to
extract the parameters of the solar cell model require some kind of
assumptions, which accompanies the calculation errors, thereby
lowering the accuracy of the model.In the first half of the paper,a
novel method of extracting values of parameters is proposed.The
proposed method deduces characteristic curve of an ideal solar cell
using solar cell equation,and extracting the parameters from the
difference between the ideal and measured I-V curve.
LINK
https://copy.com/JklVLhChfBMQ20yf

QUALIFICAÇÃO E ETIQUETAGEM DE INVERSORES PARA SISTEMAS FOTOVOLTAICOS CONECTADOS À REDE AIMÉ FLEURY DE CARVALHO PINTO NETO Programa de Pós-Graduação em Energia. Universidade de São Paulo. São Paulo, 2012

RESUMO
Pinto Neto, A. F. C. Qualificação e Etiquetagem de Inversores para Sistemas Fotovoltaicos Conectados à Rede. 2012. 141 p. Dissertação de Mestrado. Programa de Pós-Graduação em Energia. Universidade de São Paulo. São Paulo, 2012.
Este trabalho apresenta o desenvolvimento de uma metodologia para a etiquetagem e qualificação de inversores para Sistemas Fotovoltaicos Conectados à Rede, com finalidade de servir de proposta de procedimento para inclusão no Regulamento de Avaliação de Conformidade de Equipamentos e Sistemas Fotovoltaicos do Programa Brasileiro de Etiquetagem. O procedimento desenvolvido avalia os inversores quanto à eficiência, qualidade de energia, proteções e informações operacionais e de instalação.

LINK
http://lsf.iee.usp.br/lsf/pdf/mestrado/Mestrado_Aime_Fleury_Carvalho_Pinto.pdf

INVERSORES MONOFÁSICOS PARA CONEXÃO DE SISTEMAS FOTOVOLTAICOS À REDE FILIPE MARANGONI Universidade Tecnológica Federal do Paraná.

INVERSORES MONOFÁSICOS PARA CONEXÃO DE SISTEMAS
FOTOVOLTAICOS À REDE
FILIPE MARANGONI
Dissertação apresentada como requisito parcial
para obtenção do grau de Mestre em Engenharia
Elétrica, do Programa de Pós-Graduação em
Engenharia Elétrica da Universidade Tecnológica
Federal do Paraná. Área de concentração: Sistemas
e Processamento de Energia.
LINK
http://repositorio.utfpr.edu.br/jspui/bitstream/1/404/1/PB_PPGEE_M_Marangoni,%20Filipe_2012.pdf

A Single-Phase Current Source Solar Inverter with Constant Instantaneous Power, Improved Reliability, and Reduced-Size DC-Link Filter Bush, Craig R. (Author) ARIZONA STATE UNIVERSITY December 2013

A Single-Phase Current Source Solar Inverter with Constant Instantaneous Power, Improved Reliability, and Reduced-Size DC-Link Filter
by Craig R. Bush
A Dissertation Presented in Partial Fulfillment
of the Requirements for the Degree Doctor of Philosophy

Abstract
 This dissertation presents a novel current source converter topology that is primarily intended for single-phase photovoltaic (PV) applications. In comparison with the existing PV inverter technology, the salient features of the proposed topology are: a) the low frequency (double of line frequency) ripple that is common to single-phase inverters is greatly reduced; b) the absence of low frequency ripple enables significantly reduced size pass components to achieve necessary DC-link stiffness and c) improved maximum power point tracking (MPPT) performance is readily achieved due to the tightened current ripple even with reduced-size passive components. The proposed topology does not utilize any electrolytic capacitors. Instead an inductor is used as the DC-link filter and reliable AC film capacitors are utilized for the filter and auxiliary capacitor. The proposed topology has a life expectancy on par with PV panels. The proposed modulation technique can be used for any current source inverter where an unbalanced three-phase operation is desires such as active filters and power controllers. The proposed topology is ready for the next phase of microgrid and power system controllers in that it accepts reactive power commands. This work presents the proposed topology and its working principle supported by with numerical verifications and hardware results. Conclusions and future work are also presented.
LINK ORIGINAL
http://repository.asu.edu/attachments/125815/content/Bush_asu_0010E_13372.pdf

Design of Inverter for LCD TV Backlight with Flat Fluorescent Lamp Jeongwook Hur Department of Electronic and Computer Engineering Graduate School Dankook University

Design of Inverter for LCD TV Backlight
with Flat Fluorescent Lamp

Jeongwook Hur
Department of Electronic and Computer Engineering
Graduate School
Dankook University


The liquid crystal display(LCD) TV market has been growing continuously and cost reduction is one of the biggest issues to increase its market share. The LCD needs backlight because it belongs to non emissive displays. The cold cathode fluorescent lamp (CCFL) and external electrode fluorescent lamp (EEFL) are widely used in backlight system for LCDs. But assembly of CCFL and EEFL backlight system is very complex. The flat fluorescent lamp (FFL) is a newly developed light source and it has a very simple structure. The LCD backlight can have a simple structure if the newly delvelop FFL is used as a light source. The backlight with FFL can be more cost effective than that of the backlights with CCFL or EEFL light sources. But the temperature behaviour of FFL backlights are different from the backlight with CCFL or EEFL light sources, which prohibits FFL backlight from being accepted as the backlight for commercial application.

LINK
https://copy.com/9MlzDr9PydAy1J1G

EMC FILTERING OF THREE-PHASE PWM CONVERTERS MARCELO LOBO HELDWEIN DISSERTATION TO THE ETD ZURICH FOR THE DEGREE OF DOCTOR SCIENCES

LINK
https://copy.com/WKO9nBseYvsrzykM

Comparison of Simulation using PSIM and SIMULINK in Power Electronics Circuits SAMNANG KUONG

DEPARTMENT OF ELECTRICAL AND COMMUNICATION SYSTEM ENGINEERING GRADUATE SCHOOL OF SOONCHUNHYANG UNIVERSITY

ABSTRACT

This thesis proposed the comparison of both simulation softwares PSIM and MATLAB/SIMULINK, implemented on the power electronics circuits. It will be helpful for designers to decide which software is preferable for the analysis of their power electronics circuits. The circuits that invoked to simulation are AC to DC converters(rectifiers), DC-DC converters, DC-AC converters(inverters), and AC-AC converters. The pure resistances and inductances load are used and input power is supplied by the single-phase and three-phase AC or DC voltage source. The comparison is focusing on the differences of output performances between these two simulation softwares, and the results are considered on the output waveforms of circuit which is drawn and simulated on the schematic window of each software; whether the waveforms in each circuit are matched or not. The process of comparison was accomplished on the same condition of both simulation softwares. The explanations and the features of these comparison is included.

A study on the performance of 10kW Grid-Connected Photovoltaic Power Conditioning System with characteristics variation in inductor core materials Lee, Kyoung-Jun

Grid-Connected power conditioning system (PCS) is widely used for distributed generation system. In Grid-Connected PCS, the LC filter is essential to reduce the current harmonics injected to the grid. In this paper adequate inductor core materials are selected to analyze the performance of 10 kW Grid-Connected Photovoltaic (PV) PCS. Core materials can be classified into three groups: power core, sheet core and ferrite core. For the experiment, Fe-3%Si core, Fe-6.5%Si (Super core) and Mega Flux core were chosen as a filter inductor core. Optimal condition for each inductor core is determined by the efficiency and THD.

Development of A Low Cost Active Power Filter to Suppress Neutral Current Harmonics in Three-Phase Four-Wire System JANG MIN SOO DEPARTAMENT OF CONTROL AND INSTRUMENTATION ENGINEERING SEOUL NATIONAL UNIVERSITY OF TECHNOLOGY

Development of A Low Cost Active Power Filter to Suppress Neutral Current Harmonics in Three-Phase Four-Wire System JANG MIN SOO
DEPARTAMENT OF CONTROL AND INSTRUMENTATION ENGINEERING SEOUL NATIONAL UNIVERSITY OF TECHNOLOGY


Three-phase four-wire electrical distribution systems are widely employed in manufacturing plants, commercial and residential buildings. Due to the nonlinear loads connected to the distribution system, the neutral conductor carries excessive harmonic currents even under balanced loading since the triplen harmonics in phase currents do not cancel each other. This may result in wiring failure of the neutral conductor and overloading of the distribution transformer. This paper proposes a reduced rating active power filter to suppress neutral current harmonics in three-phase four-wire electrical distribution systems. The proposed scheme employs a single-phase inverter connected in series with the neutral conductor and a -Y transformer connected in parallel with the load. The proposed active filter eliminates neutral current harmonics while it does not affect the fundamental current due to unbalanced loading. The VA rating of the inverter is significantly reduced since only fundamental current due to unbalanced loading could flow through the inverter switch. The experimental results on a prototype validate the proposed control approach.
LINK PAPER
https://copy.com/VEbQ8vgFzQ6xAXrG

Instalações Elétricas – 4ª Edição – Ademaro A. M. B. Cotrim PDF

LINK 1
http://depositfiles.org/files/hnxzlbkzg

LINK2
https://copy.com/EwMbNVYiSztZOhay

Engineering Electrodynamics: Electric Machine, Transformer, and Power Janusz Turowski,Marek Turowski

Uninterruptible Power Supplies Josep M. Guerrero Technical University Catalonia Juan C. Vasquez Technical University Catalonia

Uninterruptible Power Supplies

Josep M. Guerrero
Technical University Catalonia
Juan C. Vasquez
Technical University Catalonia

18.1 Introduction Uninterruptible power supply (UPS) systems become more and more important due to the growing critical loads, such as telecommunication systems, computer sets, and hospital equipments. In the last few years, an increasing number of publications about UPS systems research have appeared, and, at the same time, different kinds of industrial UPS units have been introduced in the market. Furthermore, the development of novel energy storage systems, power electronic topologies, fast electrical devices, high-performance digital processors, and other technological advances yield new opportunities for UPS systems [King03, Bekiarov02].
LINK
http://www.mediafire.com/view/p8o9ggq89i552wj/UPS.pdf

Contactless Energy Transfer Marian P. Kazmierkowski Warsaw University of Technology Artur Moradewicz Electrotechnical Institute

Contactless Energy
Transfer

Marian P.Kazmierkowski
Warsaw University of Technology
Artur Moradewicz Electrotechnical Institute
Jorge Duarte Eindhoven University of Technology
Elena Lomonowa Eindhoven Universityof Technology
LINK
http://www.mediafire.com/view/7febbqijwkx80i3/850_pdfsam_Power_Electronics_and_Motor_Drives.pdf

Power Electronics and Motor Drives Advances and Trends Bimal K. Bose

LINK
https://www.mediafire.com/?6qnty3bk8zr0j6u

Troubleshooting Switching Power Converters A Hands-on Guide By Sanjaya Maniktala

LINK
https://www.mediafire.com/?izge1xpni11kzxp

PROJETO E CONTRUÇÃO DE UM RESTAURADOR DINÂMICO DE TENSÃO MAURICIO GALASSI ENGENHARIA ELETRICA UNIVERSIDADE DE SÃO PAULO BRASIL

PROJETO E CONTRUÇÃO DE UM RESTAURADOR DINÂMICO DE TENSÃO
MAURICIO GALASSI UNIVERSIDADE DE SÃO PAULO BRASIL
DISSERTAÇÃO APRESENTADA A ESCOLA POLITÉCNICA DA UNIVERSIDADE SÃO PAULO
PARA OBTENÇÃO DO TÍTULO DE MESTRE EM ENGENHARIA ELETRICA
LINK
http://www.mediafire.com/view/1w0e5s9n65c17xd/VERSAOFINALT-TESIS_DVR-BRASIL.pdf

Gate Drive Technologies Reinhard Herzer Semikron Elektronik GmbH& CoKG Nuremberg, Germany

LINK
http://www.mediafire.com/view/7ehvrk3olfeh8vf/S1_Documentation_Herzer.pdf

Non-isolated Single Phase Uninterruptible Power Supply (UPS) System Muhammad Aamir Department of Electronics, Electrical, Control, & Instrumentation Engineering Graduate School of Engineering Hanyang University South Korea

( Abstract ) In this thesis, a high performance single phase transformer-less online uninterruptible power supply (UPS) is proposed. The use of the bidirectional buck-boost converter with high conversion ratio not only reduces the number of batteries but also ensures a transformer-less system. The rectifier has capability of power factor correction and provides regulated DC link voltage whereas the inverter provides a regulated sinusoidal output voltage to the load. In order to control the transient effect, efficient control scheme is adopted in the system. The overall efficiency of the system is improved with significant reduction in size and weight of the system due to decrease number of batteries. Qualitative analysis and experimental results obtained with a 500VA prototype shows a normal efficiency of over 94% and an input power factor of over 99%.
LINK
http://www.mediafire.com/view/319sin33r9x19d5/Non-isolated_Single_Phase_Uninterruptible_Power_Supply_(UPS)_System.pdf

Filtering Methods for DC Link Voltage Control of Common-neutral-type Transformerless Single-phase UPS

Filtering Methods for DC Link Voltage Control of Common-neutral-type Transformerless Single-phase UPS UPS is largely divided into passive-standby, line-interactive, and double-conversion types. Commonly a double-conversion type is used at a site requiring a high reliability. These days, important factors of UPS are high efficiency, low input current distortion, high input power factor, small cabinet size and low price. In this thesis, a common-neutral type transformerless UPS is proposed. A proposed UPS is composed of PFC with 1-switch voltage doubler strategy, half-bridge inverter, separate battery charger and separate battery discharger. PFC with 1-switch voltage doubler strategy and half-bridge inverter are configured as commom-neutral type so that they can convert power without input and output transformer. Therefore input and output transformers can be removed, so the efficiency can be improved and cabinet size can be reduced. Also advantage of PFC with 1-switch voltage doubler strategy and half-bridge inverter is that they need a small number of switching devices so they can simplify driving circuitry and reduce the price. Advantage of separate battery charger and separate battery discharger is that they can make battery voltage lower than DC link voltage so they can reduce the quantity and cost of battery which is an important part of UPS. PI controller was used as voltage controller and current controller of PFC. In order to compensate imbalance of positive and negative DC link voltages, imbalance voltage PI controller was used. In order to compensate leading effect of input current, duty feedforward method was used. Several methods to eliminate 120Hz ripple component in DC voltage feedback were compared with each other. Moving Average resulted in better performance than other methods. Half-bridge was used as inverter circuit. In order to achieve stable static output voltage and improve dynamic characteristic multi-loop control method was used. Finally, the value of proposed UPS was confirmed in the method of simulation and experiment.
LINK
http://www.mediafire.com/view/2mdbwm62nnxca1r/TRANSFORMER_LESS_UPS.pdf

A study on Development of an algorithm for reducing neutral current in three-phase four-wire PWM rectifier of UPS Kim,SeungHo Dept. of Electrical Engineering Graduate School of Industry and Engineering Seoul National University of Science and Technology

LINK
http://www.mediafire.com/view/biy1liofkhrdmak/dq-based_individual_phase_control_of_three-phase_four-wire_PWM_rectifier_for_UPS.pdf

A Study on the Hybrid UPS with Electrical Energy Storage Function Seung-Beom Lim Department of Electrical Engineering Graduate School, Dankook University

A Study on the Hybrid UPS with Electrical Energy Storage Function

A Study on the Hybrid UPS with
Electrical Energy Storage Function
Seung-Beom Lim
Department of Electrical Engineering
Graduate School, Dankook University
Advisor： Professor Soon-Chan Hong

EES(Electrical Energy Storage) is the system which stores the remaining energy during the time of light load or night time with the cheap electricity price, and then discharges the stored energy during the time of peak load or electric power shortage. This system improves usage efficiency and stabilizes the power supply system. UPS(Uninterruptible Power Supply) can be divided into three parts according to dependency between input and output voltage : Passive-Standby, Line-Interactive, and Double-Conversion. Double- Conversion type UPSs are used to supply the stable power to industrial high-tech/medical equipments and finance/data centers, where loads are sensitive to the blackout and voltage fluctuation. In this paper, it is proposed a double-conversion hybrid UPS with EES function. The proposed hybrid UPS is operating in four states, which are normal state, battery state, bypass state, and EES state. When the AC input source is normal, the system operates in normal state which supplies the stable power to the load through the PFC and inverter, and charges batteries simultaneously. In case of black out or unstable input, the system operates in battery state which supplies the energy from the batteries to the load. In bypass state in case of overload or failure of the inverter, the system supply the input power to the load directly. When the system is needed to operate in EES state, AC input is cut off by the user command and the energy stored in the batteries is supplied to the load. Thereby the system can manage the power efficiently and make the power system more stable. The proposed system is composed of a rectifier, an inverter, a battery charger, and batteries. The rectifier operates as the PFC in normal state and as the battery discharger in battery state and EES state. In the proposed system, there is no battery discharger which is essential in the conventional system. As a natural consequence, the size and weight of the system are reduced. In addition, by designing the inverter as 3-level TNPC(T-type Neutral Point Clamp) inverter, efficiency is improved compared to the conventional 2-level type. To verify the proposed system, it is simulated through the C-block of PSIM. Also, the proposed system with the output rating of 2,700 Watts is constructed and experimented. As a result, it was verified that the proposed system has excellent performances in the viewpoints of efficiency, input power factor, and THDs in input current and output.
LINK
http://www.mediafire.com/view/55llpri0ilp2ock/A_Study_on_the_Hybrid_UPS_with_Electrical_Energy_Storage_Function.pdf

FOTOGRAFIAS PCIM2014 SOUTH AMERICA SÃO PAULO 14-15 OUTUBRO2014

LINK
https://plus.google.com/photos/111424134529259305519/albums/6075043960199981521