다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

http://ieeexplore.ieee.org/iel5/5610941/5624686/05624745.pdf

Power electronics

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Power Electronics Converters Applications And Design

This paper proposes a power management architecture that utilizes both supercapacitor cells and a lithium battery as energy storages for a photovoltaic (PV)-based wireless sensor network The supercapacitor guarantees a longer lifetime in terms of charge cycles and has a large range of operating temperatures, but has the drawback of having low energy density and high cost The lithium battery has higher energy density but requires an accurate charge profile to increase its lifetime, feature that cannot be easily obtained supplying the wireless node with a fluctuating source as the PV one Combining the two storages is possible to obtain good compromise in terms of energy density A statistic analysis is used for sizing the storages and experimental results with a 5-W PV energy source are reported

Li-Ion Battery-Supercapacitor Hybrid Storage System for a Long Lifetime, Photovoltaic-Based Wireless Sensor Network

This paper presents an effective biogeography-based optimization (BBO) for optimal location and sizing of solar photovoltaic distributed generation (PVDG) units to reduce power losses while maintaining voltage profile and voltage harmonic distortion at the limits. This applied algorithm was motivated by biogeography, that the study of the distribution of biological species through time and space. This technique is able to expand the searching space and retain good solution group at each generation. Therefore, the applied method can significantly improve performance. The effectiveness of the applied algorithm is validated by testing it on IEEE 33-bus and IEEE 69-bus radial distribution systems. The obtained results are compared with the genetic algorithm (GA), the particle swarm optimization algorithm (PSO) and the artificial bee colony algorithm (ABC). As a result, the applied algorithm offers better solution quality and accuracy with faster convergence.

/pdf/determination-of-optimal-location-and-sizing-of-solar-2tuy4sq8yr.pdf

Determination of Optimal Location and Sizing of Solar Photovoltaic Distribution Generation Units in Radial Distribution Systems

This paper presents a scheme for transferring power from the photovoltaic (PV) modules to a battery using a solar charge controller based on a Cuk dc/dc converter. The converter is configured in parallel power transfer mode (PPT) to achieve higher efficiency. PWM control with maximum power point tracking algorithm is used to extract maximum power from the PV modules. Mathematical modelling and field test results using multi crystalline photovoltaic modules have been carried out to verify the effectiveness of the device.

Analysis and design of a solar charge controller using cuk converter

This paper presents the control for Shunt Active Power (SAPF) filter in photovoltaic (PV) systems connected to the grid. The proposed configuration of the system consists of a photovoltaic array that connected to the grid through the three-phase inverter topology that also serves as an active filter. Photovoltaic is coupled in parallel with the direct curret (DC) side of the active filter. With this configuration, can be obtained three advantages, namely the elimination of harmonic currents caused by nonlinear load, reactive power injection, and injection of active power generated photovoltaic. The p-q Theory is used to calculate the harmonic reference current to be used to control the active filter coupled fotovoltaic in generating anti-harmonic currents. The results show that system can reduce harmonic distortion from THD 27.22% to be THD 1.05%, whereas when the active power from photovoltaic injected, the THD become 2.01%. Power sharing can also be seen from this study.

https://ijpeds.iaescore.com/index.php/IJPEDS/article/download/11325/11302

Control Design For Shunt Active Power Filter Based On p-q Theory In Photovoltaic Grid-Connected System

In this paper, a Particle Swarm optimization (PSO) based controller is implemented to a BLDC motor. A PSO-based controller is designed for controlling BLDC motor speed with acceleration consideration. PSO is used to find the appropriate PI controller parameters, Kp and Ki according to the speed reference and response speed designed. The result shows that the PSO-based controller designed is able to control the speed of BLDC motor properly with the desired response speed.

Particle swarm optimization-based BLDC motor speed controller with response speed consideration

Currently, there are a lot of renewable energy potential research focusing on the potential of photovoltaic and fuel cell. However, the main problem in photovoltaic and fuel cell application is only able to generate low output voltage. In order to increase the voltage, converter device is required before applied to the load. The dc-dc boost converter is one kind of converter which used for increasing output voltage. However, a conventional boost converter is only optimally worked in 2–3 times conversion rate of the input voltage, so this converter can not supply the load with high voltage rate. This research implements high voltage gain converter based on B×B topology for fuel cell application. The advantages of high voltage gain dc-dc boost converter is having conversion rate and high efficiency also has a simple implementation and it will be compatible to be applied in renewable energy sources with dc low voltage, such as photovoltaic and fuel cell. From the implementation results, the high gain dc-dc converter can improve the voltage gain about 4.5 times and able to be implemented with fuel cell application.

Implementation of High Voltage Gain DC-DC Boost Converter for Fuel Cell Application

In designing photovoltaic systems connected to the grid system usually DC-DC converter is required to increase the output voltage of the photovoltaic. The most commonly design of DC-DC converters are typically used a converters with high gain static in order to increase the output voltage of the photovoltaic and obtain a high conversion efficiency. One type of converter used is a SEPIC converter topology. However, the conventional DC-DC converter topologies such as SEPIC converters can only increase by 5 times of the input voltage when the Duty Cycle is set to 0.82. Meanwhile, to meet the dc input voltage of the inverter, the input voltage of the converters have to increase above than 10 times. Therefore, to overcome these problems, this paper proposes the design of DC-DC modified SEPIC converter topologies for photovoltaic applications. Modifications to the conventional SEPIC converter is done by adding capacitors and diodes. From the experimental results shows that this converter can increase the output voltage about 10 times and has the efficiency about 91.5%. Furthermore, topology of the this converter can be effectively applied for photovoltaic system.

Dedet Candra Riawan

Papers

Analysis and design of a solar charge controller using cuk converter

Control Design For Shunt Active Power Filter Based On p-q Theory In Photovoltaic Grid-Connected System

Particle swarm optimization-based BLDC motor speed controller with response speed consideration

Implementation of High Voltage Gain DC-DC Boost Converter for Fuel Cell Application

Design and analysis of high gain modified SEPIC converter for photovoltaic applications