ENHANCEMENT OF POWER QUALITY IN DISTRIBUTION SYSTEM USING HYBRID SEVEN LEVEL H-BRIDGE INVERTER BASED DPFC
B Vijaya Krishna B Venkata Prashanth P Sujatha
According to enrichment of electricity demand and enhanced the many numbers of non-linear loads in power grids needing an adept electrical power. In this article, improvement of power quality in distribution systems using hybrid seven level H-bridge inverter (HSLHBI) structure based distributed power flow controller (DPFC) is developed. A DPFC is one of the contemporary FACTS devices and its structure is similar to the unified power flow controller (UPFC). In spite of UPFC, in DPFC the common DC-link capacitor between the shunt and series converters is eliminated and the three-phase serial converter is divided to many single-phase series distributed converters through transmission line. This finally enables the DPFC to fully control all power system parameters. DPFC increases the reliability of the device and reduces its cost simultaneously. The HSLHBI is acts as voltage source converter (VSC). The MLIs are used for high power and high voltage applications. The HSLHBI output voltage produces a staircase output waveform, this waveform look like a sinusoidal waveform leads to reduction in Harmonics. The fuzzy logic controller (FLC), proportional-integral (PI) controller and multi-carrier sinusoidal PWM technique are designed for DPFC to controlling its parameters. The performance of the designed DPFC for distribution system is verified by construing the MATLAB/Simulink model. The results are presented to show the performance of the designed DPFC in distribution system with FLC.
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