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۱A Novel Hysteresis Band Width Modulator forVSC Used in FACTS Based on Fuzzy Algorithm
نویسنده(ها): ،
اطلاعات انتشار: بیست و سومین کنفرانس بین المللی برق، سال
تعداد صفحات: ۷
Flexible AC Transmission Systems arevery useful utilities in electric power management. One of qualification factors of these instruments is the amplitude of highfrequency harmonics produced in their output. Most of recent types of FACTS use a main building block called VSC (Voltage Source Converter) which convert DC to AC bymodulating AC wave forms on DC by using pulse modulation. Hysteresis modulation is a simple and useful technique for this kind of purpose. Changing the hysteresis band dynamically can help to attenuate output harmonics. In this article a TSK fuzzy controller has been designed in order to vary the proposed band according to system signals to reach suitable results. In addition an integrator has been added to modulator's loop for employing integral control advantages.<\div>

۲A New Robust Harmonic Balance Calculation Method Based On Feedback Control Loop
اطلاعات انتشار: کنگره ملی مهندسی برق، کامپیوتر و فناوری اطلاعات، سال
تعداد صفحات: ۵
Numerical solution of non–linear circuits excited by a periodic input involved in electronics and communications is one of the most popular usages of applied mathematics inengineering. The classic method for solving problems of that type is The Harmonic Balance Method. This method separatesthe circuit into linear and non–linear parts that are connected to each other in some nodes. Whenever nodal KVL and KCL equations are satisfied in those nodes in some desiredfrequencies, the solution is achieved. In this paper a new reformation of harmonic balance method is introduced basedon the idea of feedback control–loop. The proposed method has an obviously better stability and robust performance under different variations of circuit parameters while its convergence rate is almost the same in various situations.<\div>
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