Abstract-This paper presents simulation results of the application of distance relays for the protection of transmission systems employing flexible alternating current transmission controllers such as the unified power flow controller (UPFC). Firstly a detailed model of the UPFC and its control is proposed and then it is integrated into the transmission system for the purposes of accurately simulating the fault transients. The simulation results show the impact of UPFC on the performance of a distance protection relay for different fault conditions and for different fault location.
Original scientific paper This paper focuses on the advancement of electric power quality tendencies of an induction motor as well as alleviating the consequence on account of the prolonged duration voltage discrepancy and also quite a short time period voltage variance of these kinds of that over voltage, under voltage continuous interruption, impermanent voltage fall together with voltage climb or maybe an entire disappearance of voltage. The proposed alleviating device is a brand new topology of a dynamic voltage restorer (DVR). A DVR is often familiar to alleviating the impact of unusually high voltage variations while making use of a highly effective custom electric power equipment that is to say dynamic voltage restorer. It contains an electric power storage device, filtration systems, voltage source inverters and also injection transformer. There are numerous categories of regulating approaches being employed for mitigation of abnormal voltages. The proposed control approach to DVR will be based upon the 'abc to dqo' conversion methodology employed. The demonstration outcomes can be found in several circumstances of sag, swell and additional harmonic disorder in the supply voltage which exhibits the reimbursement abilities of DVR. The performance of suggested strategy is examined with the aid of computer demonstration through the use of MATLAB/SIMULINK software. Keywords: distribution system; dynamic voltage restorer; power quality; unbalanced and distorted load; voltage sags and swells; voltage source inverter Poboljšanje kvalitete električne energije u pogonima indukcijskih motora uporabom prilagođenog pogonskog uređajaIzvorni znanstveni članak Rad se bavi nastojanjima za poboljšanje kvalitete električne energije indukcijskog motora kao i ublažavanjem posljedica zbog dulje neujednačenosti napona i također kratkog trajanja takvih promjenljivosti napona, stalnih prekida napona, neujednačenog pada i porasta napona ili možda i potpunog nestanka napona. Predloženi uređaj za ublažavanje ovih pojava je sasvim nova topologija dinamičkog obnavljača napona (dynamic voltage restorer (DVR). DVR ublažava djelovanje neuobičajeno velikih promjena napona i koristi visoko učinkovit prilagođen električni uređaj, t.j. dinamički obnavljač napona. Sastoji se od uređaja za akumuliranje električne energije, sustava za filtriranje, pretvarača izvora napona i ispravljača ubrizgavanja. Postoje brojni regulatori za ublažavanje abnormalnih napona. Predloženi pristup DVR-u temeljit će se na primijenjenoj metodologiji konverzije 'abc do dqo'. Primjeri za demonstraciju mogu se naći u nekoliko slučajeva slabljenja, rasta i dodatnog harmonijskog nereda u naponu na kojima se pokazuju mogućnosti DVR-a. Izvršenje predložene strategije ispitano je pomoću demonstracije na računalu uporabom softvera MATLAB/SIMULINK.Ključne riječi: dinamički obnavljač napona; kvaliteta električne energije; neuravnoteženo i izobličeno opterećenje; pad i porast napona; pretvarač izvora napona; sustav raspodjele
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