دانلود رایگان اصل مقاله انگلیسی ناشر:elsevier تعداد صفحات انگلیسی:14 تعداد صفحات فارسی به فرمت ورد:28 Abstract A doubly-fed induction generator’s (DFIG’s) sensitivity to external faults has motivated researchers to investigate the impact of various grid disturbances, such as voltage sags and short circuit faults, on its low-voltage ride-through (LVRT) capability. However, no attention has been paid to the impact of internal faults in voltage source converters (VSCs), that interface a DFIG with the grid, ...

دانلود رایگان اصل مقاله انگلیسی سال انتشار:2014 تعداد صفحات انگلیسی:5 تعداد صفحات فارسی به فرمت ورد:17 ناشر:Transmission & Distribution Conference and Exposition - Latin America (PES T&D-LA), IEEE Abstract This study aims to analyze the transient stability of an unbalanced power distribution system (PDS) with distributed generation (DG), whose primary machine is a thermal turbine. This analysis is done by applying faults in different locations of the feeder and the determination of the critical ...

دانلود رایگان اصل مقاله انگلیسی سال انتشار:2015 ناشر:Electrical and Computer Engineering (CCECE), IEEE تعداد صفحات امگلیسی:6 تعداد صفحات فارسی به فرمت ورد:22 Abstract The problems of selectivity and coordination of protection devices is one of the concerns related to the effects of the insertion of distributed sources. Those problems directly affect the safety of equipment and personnel and continuity of service. Analysis should be done to determine if the protective devices installed on the network are ...

دانلود رایگان اصل مقاله انگلیسی سال انتشار:2013 تعداد صفحات انگلیسی:10 تعداد صفحات فارسی به فرمت ورد:32 ناشر:IEEE TRANSACTIONS ON POWER DELIVERY Abstract Although reliability-centered maintenance (RCM) has proven its noticeable merits in many industries, has not been yet furnished with efficient analytical methods in the power engineering context. The first of this two-paper set presents a practical framework by which the RCM procedure can be implemented in power distribution systems. The proposed ...

دانلود رایگان اصل مقاله انگلیسی سال انتشار:2013 تعداد صفحات انگلیسی:8 تعداد صفحات فارسی به فرمت ورد:28 Abstract The aim of this two-part paper is to present a comprehensive reliability-centerd maintenance framework tailored to power distribution systems. The first paper discusses the fundamental concepts, presents the developed algorithm, and introduces the required mathematical formulations. This second paper is focused on the application of the proposed methodology on a real distribution system. Considerable ...

دانلود رایگان اصل مقاله انگلیسی سال انتشار:2005 تعداد صفحات انگلیسی:5 تعداد صفحات فارسی به فرمت ورد:17 Abstract A harmonic injection technique, which reduces the line frequency harmonics of the single switch three-phase boost rectifier, has been implemented. In this method, a periodic voltage is injected in the control circuit to vary the duty cycle of the rectifier switch within a line cycle so that the fifth-order harmonic of the input current is reduced to meet the total harmonic distortion (THD) ...

دانلود رایگان اصل مقاله انگلیسی سال انتشار:2013 تعدا صفحات انگلیسی:23 تعدا صفحات فارسی به فرمت ورد:70 Abstract Inthe first part of this paper, three-phase power factorcorrection (PFC) rectifier topologies with sinusoidal input currentsand controlled output voltage are derived fromknown single-phasePFC rectifier systems and/or passive three-phase diode rectifiers.The systems are classified into hybrid and fully active pulsewidthmodulation boost-type or buck-type rectifiers, and their functionalityand basic control ...

دانلود رایگان اصل متن انگلیسی تعداد صفحات انگلیسی:21 تعداد صفحات فارسی به فرمت ورد:24 در این مقاله یک روش تزریق هارمونیک، که هارمونیک‌های فرکانس خط یکسوساز بوست سه فاز تک سوئیچی را کاهش میدهد,پیاده سازی شده است.در این روش یک ولتاژ پریودیک به مدار کنترل برای تغییر سیکل کاری(دیوتی سایکل) سوئیچ یکسوساز در محدوده سیکل خط تزریق ...

دانلود رایگان اصل مقاله انگلیسی سال انتشار:2012 تعداد صفحات انگلیسی:10 تعداد صفحات فارسی به فرمت ورد:33 Abstract Three new bridgeless single-phase ac-dc power factor correction (PFC) rectifiers based on Cuk topology are proposed. The absence of an input diode bridge and the presence of only two semiconductor switches in the current flowing path during each interval of the switching cycle result in less conduction losses and an improved thermal management compared to the conventional Cuk PFC rectifier. The ...

Abstract This paper deals with automatic generation controlof an interconnected hydrothermal system in continuous-discretemode using conventional integral and proportional-integral controllers.Appropriate generation rate constraint has been consideredfor the thermal and hydro plants. The hydro area is consideredwith either mechanical or electric governor and thermalarea is considered with either single or double reheat turbine. Performancesof mechanical governor, electric governor, and singlestage reheat turbine and two stage reheat turbine on dynamic responseshave been explored. Further, ...