A driving technique that can operate with electronic ballasts for fluorescent lamps to drive LEDs without requiring the replacing of any ballast circuitry or modifying existing infrastructure a lighting network is presented. This technology provides an eco-friendly and immediate solution turn system into one LED lamps. The proposed based on controlling input impedance ac/dc converter, which connected output ballast, converting high-frequency ac power from dc LEDs. With such adjustable...

In high-power converter design, insulated gate bipolar transistor (IGBT) modules are often operated in parallel to reach high output currents. Evaluating the electrical and thermal behavior of IGBTs is crucial for design reliable operation systems. This paper investigates static dynamic characterization influence parameters on IGBT behavior. Si-based power with voltage rating 4.5 kV current 1 kA used experimental evaluation module connections. Parallel-connected have been driven by several...

It is sometimes unavoidable to use loosely coupled coils in applications, like biomedical devices, for transferring electric energy wirelessly. However, coil misalignment causes degradation of the power transfer efficiency. well known that efficiency classical parallel primarily determined by quality factors and coupling coefficient between coils, maximized choosing an optimal turns-ratio coils. Changing number turns cannot effectively overcome such effect. This paper presents a structure...

Commutation failure (CF) is a frequent dynamic event at inverter of LCC-HVDC systems caused by AC side faults which can lead to blocking, interruption active power transfer, and even system blackout. To eliminate CFs improve performance, new Flexible topologies have been proposed in previous research but with limited analysis on its economic performance. Therefore, further validate the applicability topologies, this paper utilizes Life-Cycle Cost Analysis model analyze life-cycle cost...

The involvement of Line-Commutated Converter-based High-Voltage Direct Current (LCC-HVDC) systems in grid frequency support has been studied previous research, with a number practical applications. Existing methods, however, fail to achieve active bidirectional and are mainly geared towards large events. Specifically, studies have identified the inability LCC-HVDC dynamic regulation asynchronous interconnected systems. This is due DC power variations causing fluctuations reactive LCC-HVDC,...

The main battery voltage of electric vehicles (EVs) has been suggested to increase an 800-V system, which improves driving distance and charging speed. However, the design dc/dc converter is challenging because high current stress switching devices. Therefore, this article proposes a novel double-inductor rectifier with separated resonant circuits (SRCs) based on phase-shift full-bridge (PSFB) for on- board charger (OBC) applications, overcomes drawbacks frequency diodes in single-series...

Commutation failure (CF) occurs frequently under inverter AC system faults. Around 70% of power faults are Single-Line-to-Ground (SLG) that affect not only magnitudes but also phase angles non-faulty phases. This has been thoroughly analyzed in existing research. Therefore, this paper proposes a new commutation voltage calculation method where the voltages asymmetrical Multi-Infeed LCC-HVDC systems derived. The proposed considers impact transformer connections, fault location, impedance, and...

An LED lamp driver with its input compatible high- and low-frequency sources is proposed. It can be powered by the ac mains, electromagnetic ballast, or high-frequency electronic ballast. Its impedance controlled to meet operational requirements conditions of different output deliver required power array. When a source, like mains it configured as an active factor corrector. current follows wave shape source voltage. phase-shifted resonant converter controllable resistance susceptance....

In high power converter design, IGBT modules are often operated in parallel to reach output currents. Evaluating the electrical and thermal behaviour of paralleling IGBTs is crucial for design reliable operation systems. This paper investigates static dynamic characterization influence parameters on behaviour. Si based with voltage rating 4.5kV current 1 kA used experimental evaluation module connections. Parallel connected have been driven by several commercial gate units at various DC-link...

Traditional power transformer on-load tap changer (OLTC) works with mechanical switches have issues of electrical contact and part wearing, as well speed limit. Full electronics OLTC (Full-PE-OLTC) been proposed to improve its performance, but the high cost semiconductor components imposing a bottle neck for practical application. The concept hybrid tap-changer (Hybrid-OLTC) relatively lower cost. However, problems remain be solved avoid arcing when commutating current from switch...

Line-Commutated Converter (LCC) based High-Voltage Direct Current (HVDC) systems are susceptible to commutation failure (CF) during fault recovery not only for faults at inverter, but also rectifier side. Although the mechanism of CF under each scenario (fault inverter and rectifier) have been widely discussed, no existing methods can mitigate CFs both scenarios. This is because lack detailed comparative analysis root cause In this study, it shown that essence ends in fact same – long...

With the high penetration of renewable energy into power grids, frequency stability and oscillation have become big concerns due to reduced system inertia. The application Battery Energy Storage System (BESS) is considered one options deal with oscillation. This paper presents a strategy size, locate, operate BESS within grid and, therefore, investigate how sizing capacity related levels. proposes an identification method determine best location using Prony based on analysis, which easy...

Abstract With the increasing penetration of renewable energy and inverter‐based resource (IBR) generation, modern power systems are facing new challenges issues in system restoration process, such as needs fast response adaptive protection control during restoration. This paper reviews current strategies major countries regions including European Union (EU) ENTSO‐E, North America (NA) Electric Reliability Corporation (NERC), China, Australia. Firstly, Restoration Plan (RP) all above briefly...

A driving technique that can operate with electronic ballasts for fluorescent lamps to drive light emitting diodes (LEDs) without requiring the replacing of any ballast circuitry or modifying existing infrastructure a lighting network is presented. This technology provides an eco-friendly and immediate solution turn system into one LED lamps. The proposed based on controlling input impedance ac/dc converter, which connected output ballast, converting high-frequency ac power from dc LEDs. An...

With the dramatic development of communication technology, wireless network-based applications become more and popular. Accordingly, how to allocate scarce resource becomes an urgent problem. In order fully utilize spectrum improve fairness allocation, a novel allocation scheme is investigated in OFDM Systems for cognitive radio networks (CRNs) this paper, where small cell base stations (SBSs) are capable communicating with multiple secondary users (SUs) via subcarriers primary (PUs). First,...

This paper presents a semi-full-bridge submodule implementation with an integrated differential-mode choke for modular multilevel converters. The comprises two capacitors that are connected in either series or parallel to generate positive voltage, while the only negative voltage. A capacitor voltage difference appearing between during connection period is inevitable due capacitance mismatch. results large current spike period. evaluates effect of choke, increased modulation index, and...

To meet the requirements of low power Zigbee system, VCO design optimizations phase noise, consumption and frequency tuning are discussed in this paper. Both flicker noise tail bias transistors up-conversion from cross-coupled pair reduced by improved self-switched biasing technology, leading to close-in noise. Low is achieved supply voltage triode region biasing. linearly tune get constant gain, distributed varactor structure adopted. The proposed fabricated SMIC 0.18-μm CMOS process....

Silicon carbide (SiC) based power semiconductor devices are now considered as key components for future applications where high density, temperature requirement parameters, such converter valve in HVDC and FACTS systems. What is also critical the short circuit performance (i.e., withstand capability) practical application fault mode protection. This paper deals with static dynamic measurements performed SiC commercial MOSFETs modules. First tests using single pulse test setup has been gate...

A general analytical loss calculation method for cascaded H-bridge multilevel converter is proposed in the paper. Different from traditional averaged switching frequency approach, difference between operating capacitive mode and inductive will be reflected by method. The generic valid different modulation methods covering phase-shifted level-shifted multicarrier modulation. Analytical result verified detailed equivalent model based on Matlab circuit simulation.

This work deals with static and dynamic measurements performed for 4H-SiC based commercial MOSFETs power modules voltage rating of 1200 V current 120 A. First results from engineering samples Rohm show overall good confidence level that resulted in an ON-resistance 20-30 mΩ, blocking 1300-1500 threshold 3.0-3.5 V. Power have been tested upto 150 °C (recommended T <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">j</sub> was 125°C) where a shift...