نتایج جستجو برای: power supply quality

تعداد نتایج: 1331956  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه بیرجند 1388

a significant problem in multicarrier communication systems is the necessity to reduce the value of papr (peak-to-average power ratio) of transmitting signal. in this thesis we study the effect of the system parameters such as coding and modulation types on papr and ultimate ber in a mc-cdma system. in this study we consider fading channel as well as the nonlinearity of transmitter’s amplifier ...

ژورنال: Journal of Railway Research 2018
Fazel, Seyed Saeed, Foiadelli, Federica, Jafari Kaleybar, Hamed, Madadi Kojabadi, Hossein, Brenna, Morris ,

Abstract Traditional railway power supply systems impose substantial power quality problems (PQ) on the utility network, such as unbalance, harmonics and a large amount of reactive power. This paper proposes a topology based on three-phase to single-phase modular multilevel converters (MMC) to obviate these problems. The MMC based traction substations (TSS) are connected directly to the utili...

Journal: :International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering 2015

2010
Zvonimir Klaić Srete Nikolovski Zorislav Kraus

Costs of power quality disturbances (interruptions, voltage sags, harmonics, surges etc.) are very significant and have the highest impact on industry. In order to minimize those costs, it is necessary to analyze the electrical system and then try to determine possible future problems. Only after that, it is possible to improve the system in the right way. HEP d.d. – (Croatian electricity compa...

2013
M. Vijayakumar S. Vijayan

Abstract—This paper presents comparative study and implementation of Unified Power Quality Conditioner (UPQC) to eliminate harmonics and reactive power compensation in a single-phase to threephase converter system. The proposed configuration solves typical problems encountered in remote rural area applications, where only a single-phase supply is available and there is a demand for three-phase ...

Journal: :International Journal of Applied and Fundamental Research (Международный журнал прикладных и фундаментальных исследований) 2019

2014
Aakash S. Shah Vishnu Patel Manish Patel

Power quality has become an important factor in power systems. The main causes of a poor power quality are harmonic currents, poor power factor, supply-voltage variations, etc. To mitigate power quality problems, we have various equipments like active filter, passive filter, unified power flow controller and unified power quality conditioner etc. Among from them unified power quality conditione...

2006
Robert Betz Ray Palmer Terry Summers Brian Cook Peter Hogg

The quality of the power supply in any industrial environment can have a dramatic effect on the cost of production. This is particularly true in a mining environment, both above ground and underground, because of the remote location of many mining sites. This paper considers various power quality issues and their effects, and then proposes the H-bridge multilevel static compensator (STATCOM) co...

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