CHAPTER this thesis design automatic micro grid central controller



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In this thesis design the
automatic control intelligent micro Grid system for the enhancement of power
quality and minimization of power loss. The space vector pulse width modulation
technique used two level switching techniques for control the grid load. Space vector modulation (SVM) is one of the preferred real-time
modulation techniques and is widely used for digital control of voltage source
converters. A power quality conditioner with a shunt and a series inverter has
been presented for interfacing micro grids to the utility grid. The shunt
inverter is responsible for keeping a set of balanced, distortion-free voltages
within the micro-grid, while the series inverter is controlled to inject
unbalanced voltages in series along the feeder to balance the line currents
with no real and reactive power generated. During utility voltage sags, the
series inverter can also be controlled to limit the flow of large fault
currents. Collectively, the conditioner has already been shown to raise the
quality of power within the micro-grid, and the quality of currents flowing
between the micro-grid and utility.


In this thesis design automatic micro grid central controller is
designed for handling the distributed energy resources. Whenever a fault occurs
on main grid, the controller isolates the micro grid from the main grid. After
isolation, the controller removes the non-critical load from the micro grid.
Two types of central controllers are designed based on voltage control and
power control. In power control based controller, firstly it measures the power
available from the distributed energy resources and switch on the critical
loads in priority order according to the power availability. The second controller
works on voltage stability. In this controller, it shuts down the non-critical
load until the voltage does not come in the nominal limits. In future used
communication features among the different kind of loads can be explored with
the help of wireless communication.