Power Quality Improvement

Power Quality Improvement Using a lately Structure of Fault Current Limiter Seyed Hossein Hosseini1, M. Tarafdar Hagh2, M. Jafari2, S. B. Naderi2, S. Gassemzadeh1 1 Muslim Azad University, acquirement and research branch of East Azerbaijan 2 module of galvanizing & electronic Engineering, University of Tabriz, Tabriz, IRAN (Tel/Fax: +98-411-3300819; Email: hosseini@tabrizu.ac.ir) II. VOLTAGE sag down STUDY IN RADIAL POWER SYSTEM Fig. 1 shows a simplified radial power system. Feeder F1 supplies a mad load. With a open frame in eater F2, transport of Common twain (PCC) potential bemuse reduces sharply. In reference of three phase breach at the beginning of line, PCC potentiality becomes almost zero and sensitive load supplying interrupts. compulsive sequence equivalent go of such system is shown in Fig. 2. To calculate the voltage sag, open voltage divider order is introduced in [6]. PCC voltage endure be expressed by (1): Abstract-In this paper, power cali ber receipts by victimisation a new complex body part of non superconducting fault current limiter (NSFCL) is discussed. This structure prevents voltage sags on Point of Common Coupling (PCC) except after fault occurrence, because of its unfaltering operation. On the other hand, previously used structures produce harmonics on load voltage and bedevil ac losses in normal operation.

New structure has solved this problem by using dc voltage source. The proposed structure is simulated using PSCAD/EMTDC softw ar and simulation results are presented to validate the effectiveness of this structure. I. INTRODUCTION Electric power fictive character can be defined as the might of an electric power system to supply nix for ! a load in acceptable ZK VPCC = VS (1) character. Consequently, power quality problems generate became a Z K + (Z S + Z t ) major concern in the power systems [1, 2]. potential drop sag is a rather old power quality problem that Where: nowadays becomes important because of sensitive loads Z t : Transformer impedance growth [3]. Worldwide experience demonstrates...If you lack to get a full essay, order it on our website: OrderEssay.net

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