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• W1573882809 abstract "Paisan Boonchiam and Nadarajah MithulananthanElectric Power System Management, Energy Field of Study, Asian Institute of Technology,P.O. Box 4, Klong Luang, Pathum Thant 12120, Thailand;E-mail : mithu lan(@,ait. ac. t hAbstractThis paper presents the application of dynamic voltage restorers (DVR) on power distributionsystems for mitigation of voltage sags/swells at critical loads. DVR is one of the compensating typesof custom power devices. An adequate modeling and simulation of DVR, including controls inMATLAB, show the flexibility and easiness of the MATLAB environment in studying andunderstanding such compensating devices. The DVR, which is based on forced-commutated voltagesource converter (VSC) has been proved suitable for the task of compensating voltage sags/swells.Simulation results are presented to illustrate and understand the performances of DVR in supportingload voltages under voltage sags/swells conditions.Keywords: custom power, power quality, voltage sags, voltage swells, DVR.1. IntroductionModem power systems are complexnetworks, where hundreds of generating stationsand thousands ofload centers are interconnectedthrough long power transmission anddistribution networks [1]. The main concern ofconsumers is the quality and reliability of powersupplies at various load centers where they arelocated at. Even though the power generation inmost well-developed countries is fairly reliable,the quality of the supply is not so reliable.Power distribution systems, ideally, shouldprovide their customers with an unintemrptedflow of energy at smooth sinusoidal voltage atthe contracted magnitude level and frequencyl2l However, in practice, power systems,especially the distribution systems, havenumerous nonlinear loads, which significantlyaffect the quality of power supplies. As a resultof the nonlinear loads, the purity of thewaveform of supplies is lost. This ends upproducing many power quality problems. Aparlfrom nonlinear loads, some system events, bothusual (e.g. capacitor switching, motor starling)and unusual (e.g. faults) could also inflict powerquality problems [3]. The consequence of powerquality problems could range from a simplenuisance flicker in the electrical lamps to loss ofthousands ofdollars due to production shutdown.A power quality problem is defined as anymanifested problem in voltage/current or leadingto frequency deviations that result in failure ormisoperation of customer equipment 13-41Power quality problems are associated with anextensive number of electromagneticphenomena in power systems with broad rangesof time frames such as long duration variations,short duration variations other disturbances.Short duration variations are mainly caused byeither fault conditions or energization of largeloads that require high starting currents.Depending on the electrical distance related toimpedance, type ofgrounding and connection oftransformers between the faulted/load locationand the node, there can be a temporary loss ofvoltage or temporary voltage reduction (sag) orvoltage rise (swell) at different nodes of thesystem [5].Voltage sag is defined as a suddenreduction of supply voltage down 90% to 10Vonominal, followed by a recovery after a shortperiod of time. A typical duration of sag is,according to the standard, l0 ms I minute.Voltage sag can cause loss of production inautomated processes since voltage sag can trip amotor or cause its controller to malfunction.Voltage swell, on the other hand, is defined as asudden increasing of supply voltage up I l0% to180% in rms voltage at the network fundamentalfrequency with duration from 10 ms to 1 minute.Switching off a large inductive load orenergizing a large capacitor bank is a typical" @default.
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• W1573882809 date "2006-07-01" @default.
• W1573882809 modified "2023-09-26" @default.
• W1573882809 title "Understanding of dynamic voltage restorers through MATLAB simulation" @default.
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