International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 03 | Mar -2017
p-ISSN: 2395-0072
www.irjet.net
FUZZYBASED TRANSFORMERLESS SINGLE-PHASE UNIVERSAL APF FOR HARMONIC AND REACTIVE POWER COMPENSATION D. Surendra1, S. M.rama sekhara reddy2
1PG
Scholar, Dept. Of Electrical & Electronics Engineering, JNTUACEA, Anantapuramu, A.P., India professor, incharge HEAD, ,JNTUA College of Engineering, Kalikiri,, A.P., India ---------------------------------------------------------------------***-------------------------------------------------------------------defects mainly related to the appearance. For eliminating ABSTRACT- In this paper, a universal active filter was 2Assistant
developed with fuzzy logic controller for harmonic and reactive power compensation for single-phase systems applications. APF can correct the power quality and improve the reliability and stability on power utility. The proposed system is a combination of parallel and series active filters without transformer. It reduces the lower order harmonics and thus effectively reduces total harmonic distortion. Here we are using fuzzy logic controller instead of using other controllers. The model of the system is derived and it is shown that the circulating current observed in the proposed active filter is an important quantity that must be controlled. A complete control system, including pulse width modulation (PWM) techniques, is developed. The simulation was done by using MATLAB/Simulink software.
harmonic pollution in power systems, the active power filter (APF) is a very suitable tool. APF has to respond instantaneously and work with high control precision in current tracking, since the load harmonics may be very complicated and change randomly and quickly. Many advanced control and signal-processing techniques have been applied, such as pulse width modulation (PWM), hysteresis band current control (HBCC), sliding-mode control, fuzzy-logic control, neural-network theory, and adaptive signal processing and etc.
INDEX TERMS: Optimum voltage angle, single-phase configuration, total harmonic distortion, universal active power filter (UAPF), Fuzzy logic controller. I. INTRODUCTION Sensitive loads are greatly affected by powerquality (PQ) disturbances in the system. The Increased NON- Linear loads today’s life increase the distortion which causes Voltage Swell and sag. The strict requirement of power quality at input ac mains and the output load (sensitive loads) in the area of power line conditioning is very important in power electronics. Different equipments are used to improve the power quality, e.g., transient suppressors, line voltage regulators, uninterrupted power supplies, active filters, and hybrid filters. The continuous proliferation of electronic equipment either for home appliance or industrial use has the drawback of increasing the non sinusoidal current into power network. Thus, the need for economical power conditioners for single-phase systems is growing rapidly. Different mitigation solutions are currently proposed and used in practice applications to work out the problems of harmonics in electric grids. There are many studies about harmonic distortion with techniques to improve power quality and compensate distorted signal. Usually, when a passive LC (Inductor and Capacitor) power filter is connected in parallel with the load, of parallel or series resonances because of which the passive filter cannot provide a complete solution it is used to eliminate current harmonics. This compensation equipment has some Š 2017, IRJET
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Impact Factor value: 5.181
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Fig. 1. Single-phase UAPF: (a) conventional structure and (b) transformer-less proposed structure. Over the past few decades, the use of active filtering techniques has became more attractive due to the technological progress in power electronic switching devices, enhanced numerical methods, and more efficient control algorithms. The series active power filter (SAPF) provides load voltage control eliminating voltage disturbances, such as unbalance, sags, notches, flickers, and voltage harmonics, so that a regulated fundamental load voltage with constant magnitude is provided to the load. The purpose of a parallel active power filter (PAPF) is to absorb harmonic currents, compensate for reactive power, and regulate the dc-bus voltage between both active filters. The universal active power filter (UAPF) ISO 9001:2008 Certified Journal
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