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Mohankumar G.B.,Nandha Engineering College Autonomous | Balachandran M.,Nandha Engineering College Autonomous
International Journal of Applied Engineering Research

This paper proposes the performance analysis of grid-connected single phase photovoltaic (PV) inverter topology is considered to interfacing with the grid. Basically the harmonics are generated on load side only. However, the non-ideal factors in the system such as core saturationinduced distorted magnetizing current of the transformer and the dead time of the inverter also introduce the small amount of lower order harmonics in the grid current. A Proportional-integral (PI) controller and Low Pass Filter (LPF) are implemented to reduce the lower order harmonics that are present in the PV system. The complete design has been validated with MATLAB/SIMULINK software version ( and the overall system operation is observed. © Research India Publications. Source

Mohankumar G.B.,Nandha Engineering College Autonomous | Manoharan S.,Karpagam College of Engineering
International Journal of Control and Automation

Many customers who require high reliable power, utilities provide dual feeds; i.e. service to a facility comes from two independent transmission lines. Maintaining power quality is an important issue in the transmission and sub transmission system. Unified Power Quality Conditioner is the optimal solution to ameliorate the quality of power. Many researchers analyzed the performance of UPQC with various control techniques. Recent advanced UPQC is the Multi Converter Unified Power Quality Conditioner (MC-UPQC). Conventionally the MC-UPQC is controlled using the PI controller for DC link voltage control. This paper proposes Fuzzy Logic Controller (FLC) to enhance the performance of the MC-UPQC to improve the power quality in a multi bus with sub transmission system. In this article MC-UPQC is designed with two series and one shunt voltage-source converters (VSC). It is nominated to follow out in adjacent transmission lines to improve the quality of electric potential. In the proposed system, all converters are connected back to back on the dc side and share a common DC-link capacitor. It results in the transfer of power from one line to adjacent line to compensate for voltage sag/swell. Performance of MC-UPQC using the conventional PI controller and proposed FLC are compared. Harmonics produced by voltage distortion is also reduced within IEEE standards. The whole system is simulated and analyzed using MATLAB7.7/Simulink. © 2015 SERSC. Source

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