Estudo comparativo de estratégias de controle para inversores de fontes ininterruptas de energia-Dissertação de Mestrado-Autor Rodrigues, Álvaro Jorge -ESCOLA POLITÉCNICA DA UNIVERSIDADE DE SÃO PAULO

 Orientador Komatsu, Wilson (Catálogo USP) 

Banca examinadoraKomatsu, Wilson (Presidente) Kaiser, Walter Marafão, Fernando Pinhabel 

Resumo Em português

Este trabalho tem como objetivo reunir, registrar, estudar e comparar as estratégias de controle utilizadas em inversores para fontes ininterruptas de energia, efetuado através de levantamento bibliográfico, englobando estratégias antigas (implementadas muitas vezes na forma analógica) e recentes (com implementação digital). É realizada comparação dos desempenhos, determinados analiticamente por modelamento e/ou por simulação computacional, entre algumas estratégias de controle. É apresentado um método para a implementação digital de um inversor monofásico para fontes ininterruptas de energia com transformador na saída. O método utilizado consiste de: Análise e modelagem dos controladores e planta, adotando-se critérios para o ajuste dos respectivos parâmetros; Simulação no modo de tempo contínuo; Roteiro da discretização para possibilitar implementação digital; Simulação em tempo discreto; Implementação em protótipo experimental. O controle é realizado com uma estratégia de múltiplas malhas, usando três malhas: uma malha interna de corrente usando controlador proporcional com compensação feedforward da perturbação da tensão de saída no controle da corrente e uma malha externa de tensão com um controlador proporcional + ressonante. Uma terceira malha de controle externa a malha de tensão é adicionada para prevenir a saturação do núcleo do transformador. O inversor é implementado através de um arranjo físico de baixa potência, possibilitando comparação dos resultados de simulação e experimentais.

Título em inglês A comparative study of control strategies in inverters for uninterruptible power supplies.

Palavras-chave em inglêsPower electronics Protection of electrical devices Switch mode power supplies

LINK:https://teses.usp.br/teses/disponiveis/3/3143/tde-20012011-102638/pt-br.php

Single Phase Transformer Based Inverter For Nonlinear Load Application Using PI Controller R. Ramesh, A. John Dhanaseely, P. Pughazendiran

Single Phase Transformer Based Inverter For Nonlinear Load Application Using PI Controller R. Ramesh1, A. John Dhanaseely2, P. Pughazendiran3 PG Student1, Associate professors,  IFET College of Engineering, Villupuram.

 Abstract

 The paper presents a single phase transformer based inverter for nonlinear load application using PI controller. A capacitive full bridge circuit is used to provide instant current under nonlinear load conditions and thereby reducing the harmonics. A new proportional plus integral controller for inverter control is proposed to eliminate the dc current component, and steady state error under heavy load applications. The proposed controllers consist of PI controller act as voltage controller and DC offset canceller. The experimental result derived by using the MATLAB software. I. INTRODUCTION Single phase inverter is widely used in various application such as UPS, Renewable energy conversion, power source etc. The single phase inverter can be divided into half bridge, full bridge, and three level structures. The main function of the inverter is to provide an AC output voltage with less voltage distortion under both linear and nonlinear load applications. The inverter can be divided into transformer based and transformer less types. Although transformer less inverter without line frequency transformer is placed in front of load for isolation purpose, and to provide the compact size, lowest cost, less voltage distortion from the line frequency transformer and to provide fast response, but there is no galvanic isolation between power source and load.

The transformer based inverter has the important characteristics is to provide the galvanic isolation between power source and the load, with the line frequency transformer between inverter and the load. For safety application such as medical installation , data center UPS system require isolation between the output neutral and power source , the transformer based inverter are heavy in demand.

The transformer based inverter has the capable to block the DC voltage, and filter out the high frequency noise generated by the inverter and to increasing the output voltage range. Nonlinear load, such as rectifier is very popular during this year. Blocking the DC voltage is also very important for the load contained magnetic component such as inductor, and transformer.

DC voltage component exist in the output of AC inverter which may cause saturation and increase the power loss of line frequency transformer. The voltage feedback signal is taking from the transformer at the inverter output and uses low pass filter to separate the DC voltage, and thereby reducing the control method.

LINK:  https://www.researchgate.net/profile/Pugazhendiran_P/publication/266327044_Single_Phase_Transformer_Based_Inverter_For_Nonlinear_Load_Application_Using_PI_Controller/links/59cc7c9caca272bb050ce2e1/Single-Phase-Transformer-Based-Inverter-For-Nonlinear-Load-Application-Using-PI-Controller.pdf

A Master and Slave Control Strategy for Parallel Operation of Three-Phase UPS Systems with Different Ratings-Woo-Cheol Lee, Taeck-Ki Lee Sang-Hoon Lee, Kyung-Hwan Kim, Dong-Seok Hyun In-Young Suh

 

A Master and Slave Control Strategy for Parallel Operation of Three-Phase UPS Systems with Different Ratings 

 Woo-Cheol Lee, Taeck-Ki 

 Department of Electrical Engineering HanKyong National University

 Sang-Hoon Lee, Kyung-Hwan Kim, Dong-Seok Hyun

 Department of Electrical Engineering HanYang University Seoul, Korea

In-Young Suh

Power&Industrial Systems R&D Center

 Abstract— Parallel operation of UPS system has been used to increase power capacity of the system or to secure reliable supply of power to critical loads. During parallel operation, load sharing control to maintain the current balance is critical for reliable operation, since load sharing is very sensitive to differences in components of each module such as amplitude /phase difference, line impedance, and output LC filters. To solve these problems various control algorithms have been researched. However, these methods cannot be applied to UPS systems with different ratings. For this case, master and slave control algorithms for parallel operation is adequate. If the ratings of UPS systems are different, the value of passive LC filters will be different, and it will affect current sharing. This paper presents the general problems associated with parallel operation of UPS systems, and control strategy for parallel operation with different ratings. The validity of the proposed control strategy is investigated through simulation and experiment with two UPS systems. 

Keywords-component; Uninterruptible Power Supply (UPS), Parallel Operation, Load-sharing Control 

LINK:https://pt.scribd.com/document/181678431/A-Master-and-Slave-Control-Strategy-for-Parallel-Operation-of-Three-phase-UPS-Systems-With-Different-Ratings48

Characteristic Improvement of a Bridgeless PFC Converter by using SiC SBDs Joon-Hyeok Jeon, Sin-Su Kyoung, Hee-Jun Kim Powercubesemi, Inc., Hanyang University

 

Characteristic Improvement of a Bridgeless PFC Converter by using SiC SBDs Joon-Hyeok Jeon, Sin-Su Kyoung, Hee-Jun Kim Powercubesemi, Inc.*, Hanyang University 

Abstract – This paper is a Bridgeless PFC with SiC SBD It is about improving the characteristics of the converter, using the topology characteristics The characteristics of SiC SBD were applied to the maximum. SiC SBD reverse recovery It has been verified that there is almost no loss, and this results in Improvement, achieved 94.58% maximum efficiency and 0.99 high power factor By doing so, it was confirmed that the characteristics of the converter were improved.

LINK: http://apeclab.hanyang.ac.kr/home/publication/pub_down.php?num=216

Review:Uninterruptible Power Supply(UPS)System Muhammad Aamir,Kafeel Ahmed Kalwar,Saad Mekhilef Power Electronics and Renewable Energy Research Laboratory(PEARL),Department of Electrical Engineering,University of Malaya,Kuala Lumpur Malaysia

 

Review:Uninterruptible Power Supply(UPS)system Muhammad Aamir,Kafeel Ahmed Kalwar,Saad Mekhilef Power Electronics and Renewable Energy Research Laboratory(PEARL),

Department of Electrical Engineering,University of Malaya,Kuala Lumpur Malaysia 

 ABSTRACT 

Uninterruptible Power Supplies (UPS) have reached a mature level by providing clean and uninterruptible power to the sensitive loads in all grid conditions. Generally UPS system provides regulated sinusoidal output voltage, with low total harmonics distortion (THD), and high input power factor irrespective of the changes in the grid voltage. This paper provides comprehensive review of UPS topologies, circuit configurations, and different control techniques used in the UPS system. A comparison based on the performance, size, cost, and efficiency of the system is presented. Different hybrid energy source UPS system and new generation UPS system for smart grid and micro-grid has been explained. Finally the paper describes performance evaluation of UPS system and explains different aspects that are to be considered for choosing a suitable UPS system by the user.

LINK:

https://www.sciencedirect.com/science/article/pii/S1364032115017189/pdfft?casa_token=CAhGpV1vf0kAAAAA:qIINtvDCKQuVUla54P-Fi2MRpu-XzgfpeetZatBYFAfAgrlzGLvM1crzA_T6mOpjXFjhy8rgxqXv&md5=3018776ba9a1c27100329454b265708b&pid=1-s2.0-S1364032115017189-main.pdf

LINK FULL PAPER:

 https://umexpert.um.edu.my/public_view.php?type=publication&row=NTEzNzU%3D