توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Avoiding of Resonance Over Voltage Under Off–State Condition of Hybrid Active Power Filter by an Active Resistive Damper
نویسنده(ها): ،
اطلاعات انتشار: بیست و ششمین کنفرانس بین المللی برق، سال
تعداد صفحات: ۱۱
Powerline communication(PLC) is one of the latest progressive technology in the field of communication. It has many advantages if it is commonl This paper presents a hybrid active power filter (HAPF) comprising an active resistive damper (ARD). The ARD can damp over voltage or over current under resonance condition, when the active part of the HAPF (inverter) is disconnected from the grid due to electrical or non–electrical failure. Whereas the electronic switches are employed in the ARD, the proposed topology can response to damping of over voltage or over current rapidly. The control method of the ARD is presented in this paper too. Also the magnitude–frequency characteristics of the HAPF and control method of the HAPF based on source current detection strategy are of the HAPF are presented with and without the ARD in this paper. Finally the simulation results are provided to validate the proposed topology analyzed in detail. Analysis and investigation<\div>

۲Control of b–Shape C–Type Hybrid Active Power Filter Based on State–Space Variables
نویسنده(ها): ،
اطلاعات انتشار: بیست و ششمین کنفرانس بین المللی برق، سال
تعداد صفحات: ۹
A control method of hybrid active power filter (HAPF) based on state–space variables and equations is proposed in this paper. The statespace equations are extracted by the averaged model of the HAPF comprising an inverter, fifth and seventh passive filters. Whereas the inverter control signals of the HAPF are extracted by the state–space variables, the output currents of the inverter are controlled effectively. The principles of the proposed control method are examined for compensation of the load harmonic currents. The presented control method was simulated and the simulation results are provided to show validation of proposed control method.<\div>

۳Three–Level NPC Inverter Control System of Hybrid Active Power Filter by Modulation Ratios of Switching Functions
نویسنده(ها): ،
اطلاعات انتشار: هفدهمین کنفرانس سراسری شبکه های توزیع نیروی برق، سال
تعداد صفحات: ۱۵
For harmonic compensation, a control system of a four–wire three–level NPC inverter employedin a hybrid active power filter (HAPF) based on modulation ratios of switching functions is proposed in thispaper. The inverter and two parallel passive filters (PPFs) tuned in 5th and 7th orders of harmonic currentsform the HAPF. The PPFs are used for compensating of average reactive power of loads and filtering of 5thand 7th orders of harmonic currents to decrease rated power of the inverter. The switching functions of theinverter control system are extracted based on compensation of variable load reactive power and the ordersof harmonic currents with exception of 5th and 7th orders. The averaged model of the inverter is extracted bypossible switching states of the inverter’s IGBTs. The proposed control method is applicable underasymmetrical non–sinusoidal source and non–linear loads conditions .The principles of the presented controlmethod are analyzed in this paper too. The proposed control method was simulated and the simulationresults are provided to validate effectiveness of the proposed control method.<\div>

۴Reduction of Voltage and Torque Fluctuations in DFIGs Fed by MultiLevel Inverters
نویسنده(ها): ، ، ،
اطلاعات انتشار: سومین کنفرانس بین المللی الکترونیک قدرت و سیستم های درایو، سال
تعداد صفحات: ۶
This paper presents methods for eliminating flicker phenomenon and reducing torque and power fluctuations in doubly–fed induction generators whose rotors is fed by thyristor– based inverters. First, effects of rotor harmonics on interharmonic content of stator voltage and torque fluctuations are analyzed. Then, methods including selective harmonic elimination (SHE) in two– and multilevel inverters by controlling switching angles are applied. Two approaches for elimination of harmonics on rotor side are studied. In the first approach, interharmonics having frequencies lower than 40 Hz for the aim of flicker reduction are eliminated. In the second approach frequencies lower than 120 Hz are eliminated for the aim of improving voltage quality. Simulation of a DFIG in both stand– alone and grid–connected conditions validates the effectiveness of the proposed approaches.<\div>
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