Research Keyword: Other Related Topics

Jul 04

Development of Transformerless Switching Mode Power Supply System for PMU Devices

In this paper, we used transformerless voltage step-down operation to build an SMPS, which made our circuit smaller and lighter as well as we could get rid of the disadvantage of transformer (loss and heat issue) in power supply. Multiple outputs with positive and negative voltage from a single source were achieved according to the need of the PMU device. For reducing the circuit complexity we used a switching regulator IC to step down DC voltage. This work has developed, modeled, and implemented multiple novel approaches. The results are analyzed and documented for the research community.

Jul 01

MPPT of Dual-PV LLC Converter using Fuzzy ANFIS Hybrid Interface

This paper proposes a hybrid interface of Fuzzy logic and Adaptive Neuro-Fuzzy Interface System (ANFIS) for a fast closed-loop control to achieve maximum efficiency of a grid-tied phase-shifted dual-input LLC converter. The algorithm can extract maximum power from Photovoltaic (PV) panels under partial shading and other dynamic weather conditions. The fuzzy logic operates by generating the duty cycle required for the LLC primary switches whereas the ANFIS generates phase shift to regulate the power flow using both Pulse Width Modulation (PWM) and Phase Shift Modulation (PSM). Utilizing the input-output dataset of each PV panel, the ANFIS model is generated whereas the Fuzzy rules operate on the derivative of power to voltage. The controller has the flexibility to operate for a wider range of inputs and it defines the behavior of a complex system. The proposed MPPT controller with a grid-tied LLC converter is designed and verified in the MATLAB/Simulink platform.

Jul 01

Advanced Systems Integration of 540 KVA Inverter and 1.86 MWh Battery Storage System: Testing and Overview

This paper focuses on the realization of advanced systems integration that has 540 KVA three-phase bidirectional inverter and 1863.68 kWh lithium-ion battery storage system at Florida Solar Energy Center (FSEC) with a partnership of University of Central Florida (UCF) and A.F. Mensah Inc. The purpose of this paper is to give the testing results and an overview of advanced systems integration on existing high-power state-of-art systems. It enables the reader to understand what to expect when considering to use of renewable energy with a battery energy storage system (BESS). After explaining each system, the real energy consumption and reduced energy consumption are demonstrated along with the battery testing results. The system’s reliability is also achieved at different power management scenarios which is also important for frequency regulation because the utility has access to the batteries, and they can be utilized during high-power demand in the area. As a result, these types of integrated systems promote the smart cities.

Jun 30

Application of Wireless Power Transfer for Inducing Cancer Cell Death by Photodynamic Therapy Using Iridium Complexes

Recently, Photodynamic Therapy (PDT) using light has been expected as a low invasive treatment because it has fewer side effects than conventional cancer treatments. However, current PDT is limited to the types of cancer that can be reached by cables, so it is difficult to apply PDT to cancers deep inside the body, such as pancreatic cancer. In this paper, we designed a wireless power transfer system that combines a small and lightweight receiving coil and LEDs for implantation in the body. After that, we experimented to see whether cancer cell death was induced by light irradiation in vitro using power transfer in free air space. As a result, we succeeded in inducing about 75 % of cancer cell death by 60 minutes of light irradiation at a 30 mm transfer distance. At that time, we derived an approximation of the amount of light energy required to induce cancer cell death by changing the light irradiation time, and we were able to predict the treatment time.

Jun 30

Flexible Usage of a Microcontroller System with Improved SPI Communication to Control Power Semiconductors for Teaching Purposes

Engineers use digital signal processors or microcontroller systems in power electronic applications to handle open- and closed-loop control, errors, data analysis, and user communication for teaching purposes. Unfortunately, conventional solutions limit flexibility and adaptivity. However, these features are essential to easily and quickly get students started with new teaching setups, train them on how to control power semiconductors, and let them analyze converter characteristics. Therefore, it is advantageous for microcontroller systems to enable user communication to change system parameters during operation. This paper presents an advanced microcontroller system that fulfills these requirements with a novel SPI communication and filter method. The study validates the microcontroller system with two experimental setups. First, the evaluation investigates closed-loop control, proving it is well-suited for teaching purposes using parameter adjustments during operation. Finally, the results show power semiconductors’ switching characteristics with another experimental setup to confirm adaptability.

Jun 30

Power-Electronic Buck Converter Based High-Power Test Circuit for Investigating DC Switching Arcs for Battery Electric Vehicles

In this paper, an innovative test circuit based on a power-electronic buck converter is used for investigating DC arcs in a copper busbar setup. This demonstrates the capabilities of the test circuit for this use case for the first time as well as enables a deeper understanding of DC arc behavior, which is eminent for the development of adequate DC switchgear for battery electric vehicles.