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DC 380 V power supply has begun to be used for data centers to save energy and supply high quality power. This paper describes dc capacitor voltage regulation of ac-dc converter using Modular Multilevel Cascade Converters based on Single-Star Bridge-Cells (MMCC-SSBC) without line frequency transformer. The proposed voltage regulation method compares each dc capacitor voltage with the reference value...
The power conditioning system (PCS) is widely used as a grid connected inverter to keep output constant. A novel power conditioning system (PCS) using a circuit of modular multi-level converter (MMC) construction is investigated. The feature of the system is that output voltage becomes multilevel for low distortion and circuit has an energy storage system such as a battery or an electric double layer...
In this paper, a novel digital soft-start control method which employs a reference modification with a neural network predictor is presented to improve the transient characteristics in parallel operated dc-dc converters. To reduce the power consumption in parallel operated dc-dc converters, the mode of them is changed frequently from stand-by mode to operating mode, or vice versa. In the transient...
This paper presents a soft-switching modular three-phase ac voltage regulator which can solve the abnormal voltage problems such as under-voltage, over-voltage, voltage sag and voltage swell. The proposed scheme is the combination of three single-phase modules while each one of the single-phase module is a serial compensation ac voltage regulator. Besides, each one of the single-phase module is composed...
The purpose of this paper is to discuss a current prediction algorithm for sensorless model control dc-dc converter. In the proposed method, the sensing resistor for the current detection is eliminated by predicting the output current. The output current is predicted from the equation of the relationship between the output and input voltage in the static state using the duty ratio and the output voltage...
This study introduces a novel and powerful speed control system with computer interface for wound-rotor induction machines (WRIM). In order to improve the sensitivity and stability of the control process, a high-speed digital signal processor (DSP) is used as the main controller. A serial resistor is connected to rotor side of WRIM to control the output power of the machine. The power consumed on...
The increasing market of mobile phones, has increased the need for electricity to power mobile phones, as well. This paper investigates the possibilities to charge a mobile phone by harvesting energy from the surroundings. Some technologies are better suited for this purpose than others. Through previous analyses solar cells and electromagnetic generator were found to be the most suitable solution...
This paper proposes Z-source with voltage multiplication inverter for grid connected Photovoltaic (PV) application. The proposed scheme has two-stage. The first stage consists of Z-source with voltage multiplication converter. The proposed converter has high gain compared to other transformer less topologies and reduced voltage stress on the switch. The second stage assembled from five switch inverter...
An electrical vehicle charging station is a charging power supply for electrical vehicles. This paper proposes design of a model for a PV based electrical vehicle that forecasts total power output under particular conditions of Ankara city. First PV cell parameters are determined and then PV array formed including cells designed in order to calculate cumulative effect. Using actual irradiation and...
With the technology roadmap of LED moving towards high efficacy low power LEDs, the current AC distribution system suffers from system inefficiency. An energy efficient ELVDC power distribution for LED lighting system is proposed. The different design considerations affecting the inherent higher voltage drop at ELVDC level are discussed in this paper. Simulations are presented in the context of a...
In this paper a resonant voltage doubler circuit is reported on, which enables high efficiency and low power consumption of a solar cell DC-DC converter (PV converter) for solar cell input. We have also developed a PV converter that uses a resonant voltage doubler circuit and achieved high conversion efficiency of 97.6% at an output power of 10kW.
This paper presents an Energy Optimization Model (EOM) for Mobile Service Providers (MSP) that enables the optimization of power efficiency and the integration of optimum renewable and clean energy sources into the mobile network. The model approach drives both Operational Expenditure (OPEX) and Capital Expenditure (CAPEX) reduction via re-engineering power provisioning and site solutions. The features...
This paper proposes a new design and implementation of a single stage three-phase multi-level inverter (MLI). The suggested inverter is modular type and can be generalized by connecting the basic modular cells in series configuration. In addition, it can be operated with symmetrical/asymmetrical Dc-voltage sources. The proposed MLI is successfully modulated using sinusoidal pulse width modulation...
For over a century, since the invention of the telephone, the telephone network has relied on DC Power and has used DC battery reserve to provide “continuous dial tone”, even during commercial power outages. The debate between proponents of George Westinghouse's AC and Thomas Edison's DC commercial power distribution schemes has raged just about as long as the telephone has existed. The debate over...
Nowadays, high power density has become essential in networking, telecommunications and computing applications. Additionally, the electronic equipment used in these applications requires a very-low voltage feeding even when its power supply has a much higher voltage rating. Therefore, high step-down converters with high power density performance are required for these applications. Consequently, a...
This paper focuses on Voltage Fed Dual Active Bridge (VF-DAB) bidirectional DC-DC converter modules connected Input Parallel and Output Parallel (IPOP) configuration. Modularity or parallel operation of the bidirectional DC-DC converters for energy storage application is not just an economic solution for increasing the power transfer capability, but also provides several advantages such as redundancy,...
This paper reports the experimental study of a 400 V class DC microgrid for an office building that has been constructed in Obihiro City, Hokkaido, Japan. The objective of this study is to develop a self-sustained distributed energy system by combining distribution energies, batteries, and appliances with DC power. This new DC energy system not only reduces the environment load and improves energy...
At the present time, the concept of coordination of photovoltaic generation systems with existing power systems has become the focus of increasing attention. Taking coordination between photovoltaic generation systems and power storage equipment as its theme, this paper elucidates the outlook for control conditions and the recovery of costs with the focus on economic performance and also reports on...
This paper addresses availability of power infrastructure in data centers and associated costs for downtime. Special attention is given to modeling of solar power sources in terms of availability as well as their implementation into critical infrastructure and the justification for their implementation from cost perspective. Influence on overall electrical reliability and availability of infrastructure...
The authors have proposed the single-stage bidirectional buck AC/DC converter. This paper shows the size and efficiency of the proposed single-stage buck AC/DC converter using SiC MOSFET in comparison with conventional two-stage buck AC/DC converter using Si IGBT. AC current harmonics, DC voltage ripples and efficiency are evaluated in single-stage converter and two-stage converter by experiments.
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