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1 Introduction Electrical equipment has become very sensitive to different power quality problems. Power quality problems cause serious losses in economic or in industrial aspects. Some equipment, like computer, uninterruptible power supply (UPS), drives etc. are major sources of different power quality problems. The power quality problems can harm the upstream system as well as the other customers connected at the utility end. As a result, researchers have attention on power quality area, to mitigate different power quality problem, for the benefits of both

1 Introduction to power quality and APF technology The Power Quality (PQ) issue is defined as “Any power problem manifested in voltage, current, or frequency deviations those results in damage, upset, failure or mis-operation of customer equipment.” Almost all PQ issues [ 1 ] are closely related with power electronics in almost every aspect of commercial, domestic, and industrial application. Equipment’s using power electronic devise are residential appliances like TVs, PCs etc.; business and office equipment like copiers, printers etc.; industrial equipment like

1 Introduction The Power Quality disturbance (PQD) study is an important aspect in the area of power system, as the disturbances affect the overall harmony of the system. Ordinarily, an AC voltage waveform and AC current waveform are expected to be sinusoidal at the system frequency. But there are several factors, namely the use of solid state devices, equipment failure, starting of large motors, lightening, abrupt decentralization of large load, etc., which causes the waveform to deviate from being a sinusoid [ 1 , 2 , 3 ]. Under such circumstances the quality

reagiert. Die Versorgungsqualität, engl. Power Quality, setzt sich zusammen aus der Spannungsqualität, die vom Netz vorgegeben wird, und der Stromqualität, die vom Verbraucher wesentlich beeinflusst wird. Über die Netzimpedanz beeinflusst der Strom die Spannung, während die Spannung den Strom abhängig vom Verbraucher beeinflussen kann; der Strom einer traditionellen Glühlampe reagiert anders auf Spannungseinbrüche als der eines Schaltnetzteiles. Um den zuverlässigen Betrieb verschiedener Geräte sicherzustellen, werden üblicherweise Grenzwerte für die Emission von

propagation, Simpozionul SEET, mai 2009, Novice Ins [5] Rodica, Doran., Ioana, Farkas., Classification of a number of postures/activities based on unsupervised learning algorithms, Quality and Innovation in Engineering and Management, Cluj-Napoca, 2011 [6] Ahmad Asrul Ibrahim, Azah Mohamed ”Optimization Methods for Optimal Power Quality Monitor Placement in Power Systems”, IEEE Transactions on Power Delivery, Volume 4, Number 1, March 2012 [7] ***Standardul de performanţă pentru serviciul de distribuţie e energiei electrice ANRE 2007 [8] ***Compatibilitate electromagneică

Volume 10, Issue 2 2009 Article 1 International Journal of Emerging Electric Power Systems Integrated Hardware System for Power Quality Disturbance Classification Azah Mohamed, Universiti Kebangsaan Malaysia Mohamed E. Salem, Universiti Kebangsaan Malaysia Salina Abdul Samad, Universiti Kebangsaan Malaysia Recommended Citation: Mohamed, Azah; Salem, Mohamed E.; and Abdul Samad, Salina (2009) "Integrated Hardware System for Power Quality Disturbance Classification," International Journal of Emerging Electric Power Systems: Vol. 10: Iss. 2, Article 1. DOI: 10

Volume 10, Issue 3 2009 Article 4 International Journal of Emerging Electric Power Systems Power Quality Disturbance Classification Based on Adaptive Neuro-Fuzzy System Thai Nguyen, University of Kentucky Yuan Liao, University of Kentucky Recommended Citation: Nguyen, Thai and Liao, Yuan (2009) "Power Quality Disturbance Classification Based on Adaptive Neuro-Fuzzy System," International Journal of Emerging Electric Power Systems: Vol. 10: Iss. 3, Article 4. DOI: 10.2202/1553-779X.2110 Power Quality Disturbance Classification Based on Adaptive Neuro-Fuzzy System

Volume 11, Issue 4 2010 Article 5 International Journal of Emerging Electric Power Systems Unified Power Quality Conditioner Using a Fuzzy Controller Chirag Patel, Dr. S. & S.S. Gandhy College of Engineering & Technology Ranjit Mahanty, Banaras Hindu University Recommended Citation: Patel, Chirag and Mahanty, Ranjit (2010) "Unified Power Quality Conditioner Using a Fuzzy Controller," International Journal of Emerging Electric Power Systems: Vol. 11: Iss. 4, Article 5. DOI: 10.2202/1553-779X.2457 Unified Power Quality Conditioner Using a Fuzzy Controller Chirag

1 Introduction During the last two decades, non-linear loads in industries have been significantly increased. In various manufacturing and industrial applications, power converters are widely used which results in production of harmonics at point of common coupling (PCC), due to which the power quality of system is affected. [ 1 ], 508) [ 2 ], 216). The equipment may face abnormal operating conditions and can lead to breakdown [ 3 ], 2). As the same distribution network feeds many other users as well, hence it is important to recognize the various reasons for

References IEEE Standard 1459-2000 (2003). IEEE Standard Definitions for the Measurement of Electric Power Quantities Under Sinusoidal, Nonsinusoidal, Balanced or Unbalanced Conditions. The Institute of Electrical and Electronic Engineers. Inc. New York. Matz V., Radil T., Ramos P., Serra A. C. (2007, May). Automated Power Quality Monitoring System for On-line Detection and Classifications of Disturbances. Proceedings of the IEEE IMTC/2007 , no. IM-7083 - 6p., Warsaw, Poland. Bollen M. H. J. (1999). Understanding Power Quality Problems: Voltage Sags and