نتایج جستجو برای: چاپر ac

تعداد نتایج: 34661  

2015
M. H. Abardeh

The matrix converter instability can cause a substantial distortion in the input currents and voltages which leads to the malfunction of the converter. This paper deals with the effects of input filter type, grid inductance, voltage fed to the modulation algorithm and the synchronous rotating digital filter time constant on the stability and performance of the matrix converter. The studies are ...

2015
Qing Bai Josef A. Nossek

Antenna arrays can be made compact when the spacing between adjacent antennas is reduced to less than half of the wavelength. This facilitates the deployment of multiple antennas to communication devices that are limited in their physical dimensions, yet introduces significant spatial correlation between the channels as well as antenna mutual coupling. With careful design of a matching network ...

2016
Yao Liu Xiaochao Hou Xiaofeng Wang Chao Lin Josep M. Guerrero

The increasing penetration of renewable generators can be a significant challenge due to the fluctuation of their power generation. Energy storage (ES) units are one solution to improve power supply quality and guarantee system stability. In this paper, a hybrid microgrid is built based on photovoltaic (PV) generator and ES; and coordinated control is proposed and developed to achieve power man...

2011
Nirmal Kumar

This study proposed a cost effective method of wind energy conversion system (WECS) incorporating permanent magnet generator (PMG) and single stage power converter. Axial flux PMG can generate rated voltage and frequency even at a lower speed and hence more suitable for direct drive WECS. To get desired voltage and frequency in continuously varying wind conditions, a new type of WECS with singl...

1999
Marco Brambilla Daniele Guidi Valentino Liberali

This paper describes a multistage FIR decimation filter implemented with a multiplier-free architecture. The filter is designed to be used in A/D converters in submicron CMOS technology. The proposed architecture aims at increasing the operation speed while limiting the power dissipation, thus reducing the injection of switching noise into the substrate and the digital/analog crosstalk.

2008
Noureddine MANSOUR Abdelkader DJAHBAR Benyounes MAZARI

ABSTRACT In this paper, a novel vector controlled sixphase induction machine which is fed from six-phase matrix converter is proposed. Though the practical implementation of matrix converter to vector controlled three phase induction motors is limited and still under investigation due to switches devices implementation difficulties and complication of modulation technique and commutation contro...

2014
A. PAWAR

This paper presents a novel matrix converter based topology with less number of semiconductor switches. The proper switching sequence of matrix converter is used to drive BLDC motor directly from single phase without dc link capacitor. A matrix converter fed BLDC motor is simulated in MATLAB. The proposed technique is simple to implement and cost effective. Keywords— Permanent magnet (PM), Brus...

2017
Punati Mallika

Multilevel inverter technology has emerged recently as a very important alternative in the area of high power medium-voltage control and also for improving the total harmonic distortion by reducing the harmonics. Generally, the poor quality of voltage and current of a conventional inverter fed induction machine is obtained due to the presence of harmonics and hence there is a significant level ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی خواجه نصیرالدین طوسی - پژوهشکده برق و کامپیوتر 1390

با گسترش استفاده از انرژی باد و تولید برق بادی، توربین های بادی متصل به ژنراتور القایی با تغذیه دوگانه، به طور گسترده ای به کار گرفته می شوند. در ژنراتورهای القایی با تغذیه دوگانه، استاتور به طور مستقیم به شبکه قدرت وصل می شود، درحالیکه، رتور آن، از طریق مبدل الکترونیک- قدرت ac-ac، به شبکه اتصال می یابد. در میان انواع مبدلهای الکترونیک- قدرت ac-ac، ساختار تبدیل غیر مستقیم توان، مانندمبدل back-t...

Journal: :Journal of laboratory automation 2015
Yi Lu Tingting Liu Ariana C Lamanda Mandy L Y Sin Vincent Gau Joseph C Liao Pak Kin Wong

Alternating current (AC) electrokinetics is a collection of processes for manipulating bulk fluid mass and embedded objects with AC electric fields. The ability of AC electrokinetics to implement the major microfluidic operations, such as pumping, mixing, concentration, and separation, makes it possible to develop integrated systems for clinical diagnostics in nontraditional health care setting...

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