International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 04 Issue: 07 | July -2017
p-ISSN: 2395-0072
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IMPROVED CONTROLLER FOR THE DUAL TOPOLOGY OF THE UNIFIED POWER QUALITY CONDITIONER (IUPQC) IN POWER-QUALITY COMPENSATION AND MICROGRID APPLICATIONS POOJARI NARESH KUMAR1, P.NAGENDRA2, M. SHOBHA3, K.SWETHA4 1 PG
Scholor, MTECH (PE), CVRT, Andhrapradesh, India Professor, Dept of EEE, CVRT, Andhrapradesh, India 3 Associate Professor & HOD, Dept of EEE, CVRT, Andhrapradesh, India 4 Assistant Professor, Dept of EEE,Andhrapradesh, India ---------------------------------------------------------------------***--------------------------------------------------------------------2 Assistant
Abstract:- This project presents an improved controller for the dual topology of the unified power quality conditioner (iUPQC) extending its applicability in power-quality compensation, as well as in micro grid applications. By utilizing this controller, past the ordinary UPQC power quality elements, including voltage sag/swell pay, the iUPQC will likewise give receptive power support to manage the heap bus voltage as well as the voltage at the grid-side bus. At the end of the day, the iUPQC will act as a static synchronous compensator (STATCOM) at the grid side, while giving likewise the ordinary UPQC remunerations at the heap or micro grid side. Exploratory outcomes are given to confirm the new usefulness of the hardware. Index Terms—iUPQC, microgrids, power quality, static synchronous compensator (STATCOM), unified power quality conditioner (UPQC).
IEEE Recommended Practice for Monitoring Electric Power Quality, is ―a diminish in RMS voltage or current at the power recurrence for terms from 0.5 cycles to 1 minute, detailed as the rest of the voltage‖. Ordinary esteems are between 0.1 p.u. what's more, 0.9 p.u., and run of the mill blame clearing times extend from three to thirty cycles contingent upon the blame current magnitude and the kind of finished current location and interference. Phrasing used to depict the magnitude of voltage sag is frequently confounding. The prescribed phrasing as indicated by IEEE Std. 1159 is ―the sag to 20%,‖ which implies that line voltage is decreased to 20% of typical esteem. Another definition as given in IEEE Std. 1159, 3.1.73 is ―A variety of the RMS estimation of the voltage from ostensible voltage for a period more noteworthy than 0.5 cycles of the power recurrence yet not exactly or equivalent to 1 minute.
INTRODUCTION
Surely, power-hardware device have achieved extraordinary mechanical changes. Be that as it may, the expanding number of power-hardware driven burdens utilized for the most part in the business has realized exceptional power quality issues. Interestingly, power-device driven loads for the most part require perfect sinusoidal supply voltage with a specific end goal to work legitimately, while they are the most mindful ones for anomalous consonant streams level in the conveyance system. In this situation, device that can relieve these disadvantages have been created throughout the years. A portion of the arrangements include an adaptable compensator, known as the unified power quality conditioner (UPQC) [l]–[7] and the static synchronous compensator (STATCOM) [8]–[l3]. The power circuit of an UPQC comprises of a blend of a shunt dynamic channel and an arrangement dynamic channel associated in a consecutive setup. This blend permits the concurrent pay of the heap current and the supply voltage, so the remunerated current drawn from the lattice and the repaid supply voltage conveyed to the heap are kept adjusted and sinusoidal. The double topology of the UPQC, i.e., the iUPQC, was introduced in [l4]–[l9], where the shunt Active channel carries on as an air conditioner voltage source and the arrangement one as an air conditioner current source, both at the major recurrence. This is a key point to better plan the control picks up, and in addition to streamline the LCL channel of the
Voltage sag is a standout amongst the most critical issues confronting mechanical and extensive business clients [15]. As of late, utilities have been confronted with an expanding number of grievances about voltage sag. The most wellknown reason for voltage sag is power system shortcomings, despite the fact that lightning strikes and engine begins are likewise reasons for this issue. Single line-to-ground deficiencies are in charge of the larger part of occurrences of voltage sag on the system, and are equipped for delivering a decrease to 33% of the ostensible voltage. Three-stage deficiencies are less normal, nonetheless they are related with more extreme issues. Another factor which impacts the magnitude of the sag is the area of the blame. A client arranged in closeness to a blame will encounter a more serious voltage sag than a client situated at a more noteworthy separation from the blame. Hardware, for example, PCs, prepare controllers, and power electronic device are infamous for their affectability to power quality unsettling influences. DC drives and chiller controls are additionally very touchy, and can stumble on a lessening in the voltage as little as 10%. Voltage sag is to a great degree troublesome, if not difficult to forestall, in spite of the fact that it is conceivable to diminish the impact on equipment. The voltage sags as characterized by IEEE Standard 1159,
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