CHAPTER this thesis design automatic micro grid central controller

CHAPTER6CONCLUSIONS AND FUTURE WORK 6.1 CONCLUSION & FUTURE WORKIn this thesis design theautomatic control intelligent micro Grid system for the enhancement of powerquality and minimization of power loss. The space vector pulse width modulationtechnique used two level switching techniques for control the grid load. Space vector modulation (SVM) is one of the preferred real-timemodulation techniques and is widely used for digital control of voltage sourceconverters. A power quality conditioner with a shunt and a series inverter hasbeen presented for interfacing micro grids to the utility grid. The shuntinverter is responsible for keeping a set of balanced, distortion-free voltageswithin the micro-grid, while the series inverter is controlled to injectunbalanced voltages in series along the feeder to balance the line currentswith no real and reactive power generated.

During utility voltage sags, theseries inverter can also be controlled to limit the flow of large faultcurrents. Collectively, the conditioner has already been shown to raise thequality of power within the micro-grid, and the quality of currents flowingbetween the micro-grid and utility. In this thesis design automatic micro grid central controller isdesigned for handling the distributed energy resources.

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Whenever a fault occurson main grid, the controller isolates the micro grid from the main grid. Afterisolation, the controller removes the non-critical load from the micro grid.Two types of central controllers are designed based on voltage control andpower control.

In power control based controller, firstly it measures the poweravailable from the distributed energy resources and switch on the criticalloads in priority order according to the power availability. The second controllerworks on voltage stability. In this controller, it shuts down the non-criticalload until the voltage does not come in the nominal limits. In future usedcommunication features among the different kind of loads can be explored withthe help of wireless communication.