مع تطور العناصر الإلكترونية الحديثة الترانزستورية و استخدامها كقواطع ساكنة تستخدم في عمليات الفصل و الوصل بحيث يمكن التحكم بإغلاق القاطع و فتحه عن طريق تطبيق توتر صغير فقط. إذ تمتاز هذه العناصر بقدرتها على التحكم بتيارات كبيرة.
اتجهت الدراسة إلى استخدام مثل هذه العناصر في دارة توليد التوترات النبضية البرقية، و ذلك لما لها من ميزات من حيث توتراتها و تياراتها الاسمية و أزمنة الفصل و الوصل التي أصبحت من مرتبة النانو ثانية، و عليه لن تتعرض هذه القواطع
الإلكترونية في أثناء فترة الحجز للتوتر العالي عليها مدة طويلة.
تعرض هذه الدراسة نمذجة مولد نبضي برقي وحيد المرحلة و تصميمه ثم مولد ثنائي المرحلة ثم تطبقُ مبدأ النمذجة على دارة مولد نبضي برقي ثلاثي المراحل، ثم تعرض و تناقش النتائج التي تم التوصل إليها و مدى مطابقة هذه النتائج مع الواقع الفعلي.
The aim of this paper is to discuss the operation of an all silicon-based solution for the conventional Marx
generator circuit, which has been developed for high-frequency (kHz), high-voltage (kV) applications
needing rectangular pulses. The conventional Marx generator, for high-voltage pulsed applications, uses
passive power components (inductors or resistors), to supply the energy storage capacitors. This solution
has the disadvantages of cost, size, power losses and limited frequency operation. In the proposed circuit,
the bulky passive power elements are replaced by power semiconductor switches, increasing the
performance of the classical circuit, strongly reducing costs, losses and increasing the pulse repetition
frequency. Also, the proposed topology enables the use of typical half-bridge semiconductor structures,
and ensures that the maximum voltage blocked by the semiconductors equals the power supply voltage
(i.e. the voltage of each capacitor), even with mismatches in the synchronized switching, and in fault
conditions. A laboratory prototype with two stages of the proposed silicon-based Marx generator circuit
was constructed using IGBTs and diodes, operating with about 1000 V dc input voltage and 10 kHz
frequency, with different rise times.
References used
M. Uman, The lightning discharge international geophysics series . Volume 39
aydon . S. C. The physics of lightning Proceedings Symposium on Non-conventional Lightning Protection, Paper No, 1,Inst.Eng, Aust, Sydney, October, 1986
HIGH VOLTAGE IMPULSE GENERATOR USING HV-IGBTs, M. Giesselmann, B. Palmer, A. Neuber Texas Tech University, Center for Pulsed Power & Power Electronics Dept. of Electrical & Computer Engineering. USA
The paper describes a method of driving system for switch reluctance motor (SRM6/8)
with 4 phases by using: PC through (RS232), driving circuit utilizing microcontroller (Atmega
8535), and operating algorithm, which is stored in the microcontroller
Power Flow control is very important procedure when renewable
sources are connected to electric grid. Furthermore, Most common
topologies of grid tied distributed generation have inductor attached
to power converters.
In this article, the role of
This research divided into theoretical and practical sections. The
theoretical section present an introduction of alternative powers and
an introduction of an induction generator and specify advantages of
induction generators from other types and present the simple
explain of their working principles. Practical section presents the
practical results reached after many experiences.
The main goal of this search is to design maximum solar power batteries charging
system, Maximum power point tracking (MPPT) system is used in the photovoltaic (PV)
system consisting of a buck-boost Direct Current DC/DC converter, which is controll
The paper begins with an introduction that describes the concept and
importance of power system security. The mathematical model is built
depending on both the linear load flow technique and the sensitivity
factors for line and generation outages.