Edson Hirokazu Watanabe

Edson Hirokazu Watanabe
Federal University of Rio de Janeiro | UFRJ · Departamento de Engenharia Elétrica (DEE)

Electronic Engineer, M.Sc. in Electrical Engineering, D. Eng.

About

189
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Publications

Publications (189)
Conference Paper
Full-text available
O objetivo principal é demonstrar de forma didática os princípios de funcionamento de um condicionador completo de energia, ou seja, que é capaz de compensar desequilíbrios, potência ativa variável e potência reativa, além de eliminar harmônicos. Este estudo visa facilitar o entendimento do fundamento de como deve ser o projeto deste tipo de condic...
Article
We conducted a national survey exploring perceptions of plagiarism among PhD holders registered in the database of the Brazilian National Council for Scientific and Technological Development (CNPq). This survey was sent to 143,405 PhD holders across the fields, including biologists, physicists, mathematicians, and engineers as well as linguists, ph...
Article
Full-text available
Wave energy emulators provide an option to extend studies of wave energy converters (WECs) in an electric power laboratory facility and to evaluate the performance of controllers in an experimental set-up. In addition, the integration of control strategies in different steps of the energy conversion process is an important step to improve the WEC o...
Conference Paper
The application of Modular Multilevel Converters (MMC) to Variable-Speed Pumped Hydro Storage (VS-PHS) is one of the currently under research options to implement large-scale energy storage units with fast dynamics and ancillary services. It is well known, though, that the MMC has a strong tendency to present high levels of submodule voltage ripple...
Conference Paper
Mediante o aumento da contribuição de fontes intermitentes de energia à rede elétrica e à conexão destas fontes no Ponto de Conexão Comum (PCC), alterações no perfil de tensão da rede, como a flutuação de tensão, comprometem a Qualidade de Energia Elétrica (QEE) do sistema. Diante da capacidade do Controlador Dinâmico e Direto de Tensão (Dynamic Di...
Article
This work analyzes the stability of water-in-oil emulsions with electric field applied, which is of practical use, but still needs to be understood regarding how to define the optimal electric field to maximize the separation of water from oil. Model emulsions with water contents between 15 and 25 wt% are used throughout the experiments. In this pa...
Article
This work proposes a voltage regulator to solve quality issues at the point of common coupling (PCC) of distribution grids affected by the intermittency of renewable energy sources. The proposed solution is a voltage compensator based on single-phase voltage source converter (VSC) units, called Dynamic Direct Voltage Controller (D²VC). The three-ph...
Article
This paper proposes an energy management system (EMS) for a fuel cell hybrid electric vehicle (FCHEV). The EMS is based on nonlinear model predictive control (NMPC) and employs a recurrent neural network (RNN) for modeling a proton exchange membrane (PEM) fuel cell (FC). The NMPC makes it possible the formulation of control objectives not allowed b...
Article
Full-text available
This paper presents a linearized Thévenin-equivalent circuit for a grid-forming Modular Multilevel Converter (MMC) under double closed-loop control, comprehending an outer voltage control-loop together with an inner current control-loop. Both the AC-side Thévenin model and the equivalent admittance of the DC-side were derived in this work. The prop...
Preprint
Full-text available
When it comes to ownership of ideas in science, Robert K. Merton (1957) observed in Priorities in Scientific Discovery: A Chapter in the Sociology of Science that 'what is true of physics, chemistry, astronomy, medicine and mathematics is true also of all the other scientific disciplines, not excluding the social and psychological sciences'. Howeve...
Conference Paper
Full-text available
Este trabalho propõe uma nova metodologia de modelagem computacional para simulação no domínio do tempo de transitórios eletromagnéticos em sistemas de potência (DPTS) com foco na avaliação do desempenho dinâmico de elementos não-lineares chaveados como, por exemplo, equipamentos FACTS. O algoritmo que descreve a estrutura principal do simulador pr...
Article
This paper proposes an approach to determine the optimal location of static var compensators (SVCs) in electric power systems in order to improve voltage profile and minimize active power losses. A multi-scenario framework that includes different load levels with different time periods is considered in this approach. The problem is formulated as a...
Conference Paper
This work proposes a Neural Generalized Predictive Control (NGPC) for tracking the maximum efficiency or the maximum power point of proton exchange membrane fuel cell (PEMFC) stacks. The NGPC consists of a nonlinear type of model predictive control (MPC) in which the prediction model is a neural network (NN). Such control strategy combines the adva...
Article
Full-text available
This paper presents an analysis of a new high voltage DC (HVDC) transmission system, which is based on current and voltage source converters (CSC and VSC) in the same circuit. This proposed topology is composed of one CSC (rectifier) and one or more VSCs (inverters) connected through an overhead transmission line in a multiterminal configuration. T...
Article
Full-text available
We are witnessing an increasing multiplication and complexity of the regulatory codes establishing the correct behaviour to comply with scientific integrity, in response to new situations challenging the common concept of integrity. This leads to a proliferation of norms, without coherent articulation or any attempt to categorize and rank the plura...
Conference Paper
Hydrogen-related technologies are a promising solution for energy storage systems. The energy surplus from renewables or the off-peak power in a centralized electric system can be used to feed an electrolyzer to produce hydrogen. Then, the stored hydrogen can be converted to electric energy using proton exchange membrane fuel cells (PEMFCs), which...
Conference Paper
Full-text available
Resumo-O objetivo principal deste trabalho é propor uma metodologia de modelagem computacional inédita que consiste na aplicação do método trapezoidal aos elementos da rede modelados como fasores dinâmicos (FD) resultando em modelos de acompanhamento. Tal metodologia permite a representação analítica de elementos da rede (resistores, capacitores, i...
Chapter
This chapter covers in detail shunt active filters, including applications to three phase, four-wire systems. Additionally, an interesting solution has been proposed for allowing the use of (n-1)-leg PWM converter in n-wire systems. This was enabled by the use of the "split-capacitor" converter topology. The principle of shunt current compensation...
Chapter
This introduction presents an overview of key concepts discussed in the subsequent chapters of this book. The book deals with the theory in a complete form for the first time, including comparisons with other sets of instantaneous power definitions. It considers the term 'power conditioning' which has much broader meaning than the term 'harmonic fi...
Chapter
This chapter presents some combined series/shunt active power conditioners, based on voltage-source converters (VSCs). An important issue related to VSCs is the switching technique of the converter. The hysteresis-band control with minor current feedback loop is a pulse-width modulation (PWM) technique that forces the converter to act as a controll...
Article
The prelims comprise: Half Title Title Copyright Dedication Contents Preface
Chapter
This chapter presents an overview of some power theories, starting from the classical references dating from the 1920s. It starts with the power definitions under sinusoidal conditions that are quite common situations and well known to electrical engineers, they are necessary to create a solid base for the rest of the theory. The chapter summarizes...
Chapter
The series active filter acts like a dual device for the shunt active filter. The shunt active filter has a voltage source at the source side and a current source at the load side, where the current source includes harmonic currents that have to be compensated by the shunt active filter. In some cases, the combination of a voltage source and its im...
Chapter
This chapter covers several important definitions of power, emphasizes their use in the control of active power-line conditioners. The theories that deal with instantaneous power can be mainly classified into the following two groups. The first one is developed based on the transformation from the abc phases to three-orthogonal axes, and the other...
Conference Paper
This paper addresses a novel control algorithm for a selective active filter compensating specific harmonic currents and the fundamental negative-sequence component of the load current. The proposed control algorithm combines the resonant controller with a PLL circuit to determine the current references in $alpha beta$ frame. Previous works introdu...
Conference Paper
Distributed generation systems have been widely implemented in power systems all over the world, and so have the non-linear loads. Then, it is worthwhile to analyze the possibility of providing these generation systems with power conditioning functionalities. In these terms, this work presents a DFIG-based wind power distributed generation system w...
Article
This paper deals with an analytical model to evaluate the noncharacteristic harmonics that are generated by three-phase three-wire voltage-source converters (VSCs) operating under unbalanced sinusoidal voltage conditions. This model permits the calculation of the oscillating current on the VSC dc side by considering the unbalanced voltages on its a...
Conference Paper
This paper addresses a novel control algorithm for a three-phase Unified Power Quality Conditioner (UPQC), connected to a radial grid with widespread nonlinear loads. Based on the proposed control algorithm, the shunt converter acts as a selective active filter and compensates the power factor. On the other hand, the series converter compensates vo...
Conference Paper
The Modular Multilevel Converter (MMC) control presents more technical challenges than the regular 2-level Voltage Sourced Converters (VSC) one. One of the most common type of control investigaded in literature is based on techniques such as the Phase Opposite Disposition PWM (POD-PWM), which include balancing capacitor voltages and circulating cur...
Article
Hydrogen-related technologies have been proposed as an alternative to store the energy surplus from renewable sources. Among these technologies, the proton exchange membrane fuel cell (PEMFC) and electrolyzer are the preferred choice for practical applications since they have reached a certain level of maturity and are commercially available at pre...
Conference Paper
This paper presents a model of typical three-phase, three-wire and two-level PWM controlled voltage-source converters (VSC) suitable to investigate the non-characteristic harmonic generation at dc- and ac-side of the converter under sinusoidal unbalanced voltage condition, e.g., third order current harmonic component of positive-sequence in the VSC...
Article
Full-text available
Construir uma comunidade científica de alto nível requer uma composição de ingredientes de primeira linha: financiamento, treinamento, gestão, colaborações internacionais, criatividade, ética e uma compreensão de práticas de integridade em pesquisa. No cenário mundial, a abordagem dessas práticas tem sido uma prioridade na agenda de políticas cient...
Conference Paper
The correct current or voltage phase angle of a power electronics equipment is an essential information, especially in those connected to grid as: thyristor rectifiers, active power filters and distributed generation systems. For this reason, up to this day there are several Phase-Locked Loop (PLL) algorithms presented. However, those algorithms us...
Conference Paper
Synchronous Machines of large power plants are responsible for setting the system frequency. This frequency allows the coordination and operation of the various Power Systems' (PS) elements. However, due to the expected development of Distributed Generation a Microgrid (MG) may lack Synchronous Generation losing the capability of isolated operation...
Article
This paper addresses the dynamic modeling and the energy storage analysis of a wave energy hyperbaric converter, which consists of a set of oscillating bodies (named as pumping modules) linked to hydropneumatic accumulators and an electric generating unit. A mathematical model of the accumulator is presented and a model for the generating unit is p...
Article
Full-text available
This article offers an account of experiences related to the problem of third--party copyright infringement, as well as some measures adopted by Coppe (the Alberto Luiz Coimbra Institute for Graduate Studies and Research in Engineering, at Rio de Janeiro Federal University) to curb potential problems in this area, including formal and educational m...
Conference Paper
This work presents an analysis of the time-varying behavior of a PEM fuel cell (PEMFC) stack based on experimental results, pointing out some constraints that should be taken into account in the development of a control system for the stack. A system identification methodology based on recurrent neural networks is proposed to model such behavior. A...
Conference Paper
This paper proposes the use of UPFC for direct voltage control in electric grids with highly intermittent generation sources such as wind generators. The variable characteristics of these sources strongly affect the voltage profile in the grids. The objective of this paper is to show through a conceptual analysis that it is possible to obtain preci...
Conference Paper
This paper describes a comparison and considerations in the implementation of synchronous and stationary current and voltage controllers. This comparison is made by analyzing the frequency response of both controllers in the PSCAD/EMTDC software. The simulations results are presented and the differences between controllers and their models for digi...
Conference Paper
This paper presents an analysis procedure for switching frequency in single and three-phase Voltage Sources Inverters (VSI), using Hysteresis Current Control (HCC). The instantaneous frequency profile, for synthesizing sinusoidal signals, and its behavior with several load variations, is presented. The analysis is performing with constant and propo...
Conference Paper
Full-text available
RESUMO O objetivo do presente trabalho é apresentar uma comparação de desempenho entre dois tipos possíveis de controle vetorial de corrente para um elo de tensão contínua com conversores VSC em configuração back-to-back. No elo de tensão contínua com conversores VSC apresentado neste trabalho, enquanto um dos terminais VSC controla a potência ativ...
Conference Paper
Full-text available
The permanent magnet synchronous generators (PMSG) used in wind turbines usually are machines with trapezoidal electromotive force (EMF) waveforms. The control techniques based on Park’s transformation, decomposing the voltages and currents into d and q axes, are not fully satisfactory when applied to such machines. For this reason, this paper prop...
Conference Paper
This work presents a recurrent neural model for PEM fuel cell stacks based on NARX and NOE neural structures. The practical difficulties to employ electrochemical models and the causes of the odd behavior observed in some PEM stacks are discussed. The model developed predicts the terminal voltage of a stack even in the situation where it presents a...
Article
The present work deals with the wave energy hyperbaric converter (WEHC) developed by the Federal University of Rio de Janeiro, Brazil. The development of WEHC, both for drawing energy from sea waves and for converting it into electrical energy, is based on keeping constant a pressure level within the hyperbaric accumulator (HA), which implies desig...
Article
Full-text available
Os conversores tipo fonte de tensão (VSC – Voltage Sourced Converter) têm sido cada vez mais aplicados em sistemas de transmissão em corrente contínua. Este tipo de conversor utiliza chaves semicondutoras com capacidade de controle de condução e bloqueio e são capazes de controlar rapidamente a potência ativa e reativa em seus terminais de forma in...
Conference Paper
Full-text available
A contínua expansão e interligação dos sistemas elétricos de potência atuais trazem vantagens econômicas e mais confiabilidade de suprimento, ao mesmo tempo em que aumentam cada vez mais o grau de complexidade destes sistemas, apresentando assim novos desafios para a sua operação de forma adequada e segura. A evolução da tecnologia dos conversores...
Article
This paper is aimed to investigate the operating characteristics of a static synchronous compensator (STATCOM) integrated with superconducting magnetic energy storage (SMES) for high power applications in the transmission network level. The STATCOM controller topology comprises multi-level multi-pulse neutral-point clamped-type (NPC) voltage source...
Conference Paper
Full-text available
Os conversores VSC têm sido cada vez mais aplicados em sistemas de transmissão em corrente contínua. Este tipo de conversor CA/CC utiliza chaves semicondutoras com capacidade de controle de condução e bloqueio e são capazes de controlar rapidamente a potência ativa e reativa de forma independente. Neste trabalho deseja-se apresentar a modelagem de...
Conference Paper
This paper focuses on the dynamic performance of an back-to-back HVDC system (HVDC-MMC) using Modular Multilevel Converter (MMC). Based on the proposed Low Frequency Switching (LFS) strategy, including a voltage balancing method, the mathematical model for the HVDC-MMC is developed. Dynamic performance of HVDC-MMC, based on time-domain simulation s...
Conference Paper
The conventional UPFC (Unified Power Flow Controller) is the most versatile equipment based on three-phase converters for controlling power flow in electric systems. This paper presents a UPFC with new and simple structures for voltage control (based on single-converters). It is shown that the voltage at a given point may be controlled in a simple...
Conference Paper
This paper presents a comparative analysis between the double-feed induction generator (DFIG) and directly connected squirrel cage induction generator (SCIG) when they are used in a wave energy conversion system. Simulation results are presented to illustrate the operating ranges of the asynchronous generators and the generated power by the system....
Conference Paper
This work presents a study of the wind power system based on Squirrel Cage Induction Generator (SCIG). It also presents an analysis of voltage regulation at the point of common connection (PCC). The induction machine is connected to the grid through a back-to-back PWM controlled voltage source converters (VSC). The induction generator side converte...
Conference Paper
This work is aimed to compare the performance of TCSC (Thyristor Controlled Series Capacitor) and SSSC (Static Synchronous Series Compensator) for damping power oscillations in the generator / long transmission line system. In order to reach better performance to damp generator oscillations, the SSSC is controlled as a variable reactance, called Co...
Conference Paper
Improving the Fault Ride Through capability (FRT) of Doubly Fed Induction Generators (DFIG) in wind power applications is a very important challenge for wind power industry. The mathematical models of such generators permit to analyze their response under generic conditions. However, their mathematical complexity does not contribute to simplify the...
Article
Full-text available
Superconducting magnetic energy storage (SMES) systems are getting increasing interest in applications of power flow stabilization and control in the transmission network level. This trend is mainly supported by the rising integration of large-scale renewable energy power plants into the high-power utility system and by major features of SMES units...
Article
The transmission of bulk power over long distances is a very current topic in the worldwide energy sector. An excellent example is the transmission system of Madeira River Hydropower Generation Project in Brazil, which includes two 2,400-km transmission lines, designed to transmit 3,150 MW through each HVDC link. In fact, long transmission trunks e...
Article
Improving the fault ride-through (FRT) capability of doubly fed induction generators (DFIGs) in wind power applications is a very important challenge for the wind power industry. The mathematical models of such generators enable us to analyze their response under generic conditions. However, their mathematical complexity does not contribute to simp...
Conference Paper
This paper presents a comparative study of dynamic performance of conventional VSC based HVDC and Modular Multilevel Converter (MMC) VSC based HVDC operating in back to back configuration. Voltage and rotor angle stability of the generator during power systems fault is analyzed. The simulated power system is composed by a back-to-back HVDC based on...
Conference Paper
Full-text available
This work describes the mathematical modeling of a system based on ocean wave conversion into electricity. An analysis of the hydrodynamic, mechanical and electrical characteristics of the subsystems that compose the converter is done and the mathematical models are presented. Simulation results are presented to assess the levels of the generated p...
Conference Paper
A number of years ago when FACTS applications had generated a great deal of enthusiasm, a paper was prepared predicting its applications in the power system restoration. It was predicted that many of the FACTS applications such as thyristor controlled shunt reactors, phase/voltage regulators, STATCOM, SVC, SSSC and thyristor controlled braking resi...
Conference Paper
The transmission of bulk power over long distances is a very current topic. In fact, it allows the connection of remote power plants to the electrical system, a common situation in countries of continental dimensions - such as China, Russia, Brazil and Canada and also some regions in Europe and Asia - where hydroelectricity and other renewable ener...
Conference Paper
Full-text available
The main objective of this tutorial is to present the basic concepts on the instantaneous p-q Theory and then show its applicability for controlling switching converters connected in a micro-grid. These converters can be used for connecting renewable energy sources (solar, wind, and others) to the micro-grids or for harmonic, reactive power or unba...
Conference Paper
Full-text available
The main objective of this paper is to compare the applicability and performance of a switching compensator when it is controlled by algorithms derived from the pq-Theory and from the Current's Physical Components Power Theory (CPC-theory) considering a micro-grid application. Compensation characteristics derived from each one of these set of power...
Conference Paper
This paper proposes a new control technique to improve the fault-ride through capability of doubly fed induction generators (DFIG). In such generators the appearance of severe voltage sags at the coupling point make rise to high over currents at the rotor/stator windings, something that makes necessary to protect the machine as well as the rotor si...
Conference Paper
Electrolyzers have been pointed out as a promising technology for use in energy storage applications. Basically, electrolyzers convert electrical energy to electrochemical energy, which stays encapsulated in diatomic hydrogen molecule for posterior use in fuel cells, which convert the electrochemical energy back to electrical energy. The main advan...
Conference Paper
Full-text available
The voltage oriented control in the synchronous reference frame (VOC-SRF) have been extensively used for controlling wind turbines based on doubly fed induction generators (DFIG-WTs) through the rotor side converter of a back to back power processor. Although its performance is fast and accurate under balanced conditions its behaviour is not good e...
Conference Paper
Full-text available
In the study of the dynamical behavior of doublyfed induction generators (DFIG), for wind power applications, the use of reduced order models is useful in order to design specific control strategies for wind power plants as well as to obtain lightweight computing simulations. Within this field this paper presents a new dynamic model for wind turbin...
Article
This work presents a review of the main techniques for synthesizing positive and negative inductance using power electronics: VAPAR (variable active-passive reactance), BVI (bootstrap variable inductance), AVI (active variable inductance) and DRS (direct reactance synthesis). Based on this review a new topology for synthesizing a fundamental freque...
Article
This paper presents a phasor modeling of a Transformer Series Voltage Source Converter (TSVSC) for voltage control. It is shown that the voltage in the system