Multi Level Inverter System using Dual Output DC-DC Converter with High Gain-Doctoral Dissertation-Department of Electrical Engineering Graduate School, Chonnam National University by Ibadullaev Anvar-February 2021

 

Multi Level Inverter System using Dual Output DC-DC Converter with High Gain Ibadullaev Anvar Department of Electrical Engineering Graduate School Chonnam National University (Supervised by Professor Park SungJun)

 (Abstract) Electricity has a weighty and an important impact on the social, industrial and economic developments of countries around the world because it is an essential ingredient of modern civilization. XXI century civilization depends on constant accessibility of this wealth in order to continue the present form of life and developing. Recently, with the development of green energy producing technology, the use of renewable sources such that photovoltaic arrays(PV), fuel cell sources, etc. have been increasing rapidly. Depending on the new research report published by “Markets and Market“, the inverter market is projected to grow from USD 12.8 billion in 2020 to USD 26.5 billion by 2025. The inverter market is likely to exhibit lucrative growth potential during the forecast period. The growth of the inverter market is expected to be driven by continuosly rising number of industrial and household solar rooftop installations. This exponentially growth of the inverter selling segment can be understood the entering of photovoltaic energy generation plants, HEV(hybrid electric vehicles) and electric vehicles charging stations that has brought new opportunities and challenges in the power electronics industry, especially in terms of the research and development of the main traction three phase AC motor drives. The multilevel inverter structure based topologies gives the OK to these vehicles to hold out to high voltages and power levels without using bulky and hard transformers. And also, the limited installation spaces of the HEVs have also led to the requirement for small size and power efficient inversion devices. Among end users, the residential segment held the largest share of the inverter market in 2019. Continuously rising electricity bills, coupled with supportive government policies worldwide, have led to the increasing adoption of energy conservation measures such as solar rooftop installations for controlling the increased energy expenditure in residential applications. Countries such as Japan, the United States, the Netherlands and Australia which are among the prominent markets for residential rooftop solar installations, have widely adopted solar inverters over conventional non-solar inverters. In addition, countries such as Brazil, the United Kingdom, India and Mexico are currently witnessing significant growth in the residential solar energy market. In modern smart grid solutions, control technologies for the consumption can response based on information about the electricity generation and transmission system and prices in an automatic way to improve the performance and reliability of the system. Demand for better designed hardware topology and controllers is constantly rising as the renewable energy market continues to sharply grow. In a typical residential, or small factory utility photovoltaic arrays are connected in series, in parallel or mixed type to form high DC voltage bus to can connect to DC-AC inverter, which then is connected directly to single or three phase AC Grid. Using renewable power generation systems established with step up dc-dc converters is being popularized because of the rising demand of zero pollution and eco friendly renewable energy sources. In this study, a new constructed multi level inverter system using dual outptut DC–DC converter was proposed to match a low DC voltage output sources, such as photovoltaic source or fuel cell systems with single phase AC grid bus lines. When comparing to other conventional multi level inverters, the proposed multi level inverter has a decreased number of the semiconductors, can create higher quality power with lower THD values, has decreased and balanced voltage stress for dual output dc-dc converter DC capacitors. The proposed topology requires a single DC source.

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A Study on Modulated Carrier Control Method for Power Factor Correction Boost Converter BY Jintae Kim- Interdisciplinary Program in Photovoltaic System Engineering The Graduate School Sungkyunkwan University

 Ph.D. Dissertation A Study on Modulated Carrier Control Method for Power Factor Correction Boost Converter BY Jintae Kim 

Interdisciplinary Program in Photovoltaic System Engineering

The Graduate School Sungkyunkwan University

 Abstract 

A Study on Modulated Carrier Control Method For Power Factor Correction Boost Converter As demand of electrical devices steeply increases, harmonic pollution on the power grid has attracted concern. This circumstance leads standards such as IEC61000-3-2 and 80-Plus regulating harmonic currents or PF (Power Factor) to have been more stringent. Thus, a PFC (Power Factor Correction) circuit able to improve power quality while reducing current harmonics has been indispensible at the electrical devices. For the reason, the PFC has been constantly researched so that various topologies and control types have been proposed and realized as silicon. So far, many of proposed PFC converters have each optimal operation mode offering good PFC performance such as CCM (Continuous Conduction Mode), DCM (Discontinuous Conduction Mode) or BCM (Boundary Conduction Mode). The same is true of conventional MCC (Modulated Carrier Control) PFC converters. The conventional MCC PFC method does not require sensing the line input voltage and offers very fast dynamic current control by directly comparing an inductor current. These are advantages of the conventional ones. However, these conventional MCC converters enter into DCM by load reduction, the line input current is distorted and harmonic current is increased. In this dissertation, a research on new MCC method is revealed from a study and analysis on the conventional MCC PFC converter. Two types of MCC method are proposed to overcome the problem of the conventional MCC aforementioned. The proposed MCC methods newly employ a circuit to detect DCM region and generate DCM compensation signal in common. Using the compensation, the MCC methods can control the line input current as a desirable sinusoidal waveform, which results in better PFC performance regardless of a line input voltage range or load variation unlike the conventional MCC method. With all them, the proposed method can maintain the advantages of the conventional MCC method and even it can be easily implemented with analog or digital circuits. This dissertation describes the proposed MCC methods and the operating principle. In addition, to verify the proposed methods, they are implemented in 400 W PFC boost converter.

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SIMULATION PSPICE PRE-REGULATOR CONVERTER BOOST (AC/DC)

 

Design of Boost power factor corrector based on UC3854 Boost Controle de Tensão e Corrente

 ABSTRACT

 PFC (Power Factor Correction) is an effective method to reduce harmonic currents in power grids The control circuit and parameters design of the PFC circuit .

As shown in Fig.2, in Boost PFC circuit, the control core is internal multiplier of UC3854DW, through sampling input voltage Vin, input current Iin and output voltage Vo1, the PWM signal is generated to force the input average current to be in phase with the input voltage, so the power factor is close to 1

                 Figure 2. Boost PFC circuit controlled by UC3854

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