Flexible Power Transmission

Arrillaga, J.; Liu, Y. H.; Watson, N.R.

doi:10.1002/9780470511862

Cited by 319 publications

(214 citation statements)

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“…através da modulação temporal de um sinal digital e vem sendo utilizada de forma eficiente para diversas aplicações, e.g. controle de iluminação de LEDs e do movimento de servomotores [1]. Para aplicarà técnica de PWM, foi utilizada a plataforma de prototipagem eletrônica Arduino [2].…”

Section: Introductionunclassified

Desenvolvimento de um obturador de feixe óptico utilizando um disco rígido de computador

Tomázio

Romero

Mendonça

2017

Rev. Bras. Ensino Fís.

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O objetivo deste trabalho é demonstrar a confecção de um obturador de feixe óptico a partir de um disco rígido de computador. O controle de corrente do dispositivo é feito por modulação de largura de pulso (Pulse width modulation - PWM), uma técnica que permite variar níveis de tensão/corrente por meio do ajuste da largura de pulso de um sinal digital. Este controle é feito de forma a minimizar a potência dissipada no dispositivo, aumentando assim sua vida útil. O núcleo do circuito de controle de corrente é o Arduino Uno, uma placa de microcontrolador de baixo custo e de fácil programação, amplamente utilizado como plataforma para prototipagem eletrônica. Por fim, a título de ilustração, apresentamos o uso do obturador de feixe óptico desenvolvido em um sistema de microfabricação via fotopolimerização por absorção de dois fótons, no qual ele tem papel fundamental.

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Section: Introductionunclassified

Desenvolvimento de um obturador de feixe óptico utilizando um disco rígido de computador

Tomázio

Romero

Mendonça

2017

Rev. Bras. Ensino Fís.

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“…However, this is achieved at the expense of larger variation in DC link voltage which is not allowable beyond a certain range (see hard limits on V * on in Fig. 2) from cable over voltage and converter modulation index considerations [7].…”

Section: Communication-less Schemementioning

confidence: 99%

“…Voltage source converter (VSC) is arguably the only choice of HVDC technology in such cases [7]. An HVDC link is asynchronous which decouples the frequencies on the onshore and offshore end.…”

Section: Introductionmentioning

confidence: 99%

Inertial response from remote offshore wind farms connected through VSC-HVDC links: A Communication-less scheme

Pipelzadeh

Chaudhuri

Green

2012

2012 IEEE Power and Energy Society General Meeting

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Abstract-A communication-less scheme that allows remote offshore wind farms connected through HVDC links to participate in primary frequency control and contribute to system inertia is discussed in this paper. As a HVDC link decouples the offshore system from the onshore side, real-time communication of onshore frequency is normally required for the primary frequency control loop of the wind farms. Dependance on remote communication which could be unreliable at times is a problem. To obviate the need for communication, appropriate droop control on the offshore and onshore converters is used in this paper to translate the variation in onshore frequency to an equivalent variation on the offshore end. Thus the need for communicating onshore frequency to the offshore side is obviated which ensures reliable operation. Such a communication-less scheme is compared against the conventional approach involving remote communication of onshore grid frequency to the wind farm site. Along side physical and analytical justification, a case study is presented to demonstrate that the communication-less scheme performs similar to the conventional one in terms of reducing grid frequency variations.

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“…The VSC was modeled to operate as a constant PV generator under both grid-connected and islanded operation of the microgrid. Since the system is unbalance, simple decoupled control of VSC was not possible [13,14]. Therefore, PI controller was designed for controlling the output power, and depending on the DC voltage error, phase angle of the Sine-wave Pulse Width Modulator (SPWM) was adjusted.…”

Section: Generator Controlsmentioning

confidence: 99%

Impact of Islanding Detection Time Duration on the Stable Operation of a Synchronous Generator Controlled Microgrid

Lidula

Rajapakse

Muthumuni

et al. 2017

Technol Econ Smart Grids Sustain Energy

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This paper presents the impact of the time duration taken to change the control mode of a microgrid from grid connected operation to islanded operation (control mode transition delay) on the stability of a microgrid. A detailed microgrid simulation model was developed and its frequency and voltage control was designed based on the most generic schemes identified after a profound literature survey on practical microgrids. The simulation study results revealed that the control mode transition delay has a significant impact on the amount of load that need to be shed to preserve the stability of the islanded microgrid. The control mode transition delay also has an impact on the power quality.

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Flexible Power Transmission

Cited by 319 publications

References 0 publications

Desenvolvimento de um obturador de feixe óptico utilizando um disco rígido de computador

Desenvolvimento de um obturador de feixe óptico utilizando um disco rígido de computador

Inertial response from remote offshore wind farms connected through VSC-HVDC links: A Communication-less scheme

Impact of Islanding Detection Time Duration on the Stable Operation of a Synchronous Generator Controlled Microgrid

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