Micro grid Design

Micro grid design for performance evaluation of micro grid system

The chosen model for the microgrid system in the research project is consists of 13.8kV, three feeder distribution system which is connected to a large network through a 69kV radial line. The 13.8 kV busbar of the three feeders are radially connected to the main grid through the transformer and a 69kV line.  The network at the end of the 69 kV line is represented by a 69 kV, 1000 MVA short circuit capacity bus. Combination of both linear and non linear loads are supplied through the three feeders of the subsystem. Both load 1 and load 2 are at feeder 1. Load 3 is at feeder 2. Whereas load 4 and load 5 are at feeder 3. DG1 is a 5.0-MVA conventional diesel-generator or a gas-turbine generator DG2 represents a fixed-speed wind-turbine set with rated capacity of 2.5-MVA which is interfaced through an synchronous generator (SG) equipped with excitation and governor control systems.

Project Methodology

Project flowchart

The designed micro grid model will be simulate under two circumstances which is during in grid connected mode and islanded mode. As for islanded mode there are two conditions that will be consider which are for unplanned switching event and preplanned switching event.

The designed  micro grid model will be simulate by using the Power System Computer Aided Design (PSCAD) software. 

PSCAD software 

PSCAD/EMTDC is an industry standard software for studying the transient behavior of electrical networks. EMTDC performs the electromagnetic transients calculations while PSCAD provides the graphical interface.PSCAD/EMTDC offers a large database of built-in components, and allows theuser to define his own models, either using other built-in components or coding a component in Fortran. Both methods are used during this study. Some components, like the electrical generators, are taken from the software library, while others, like the governors or the wind turbine aerodynamical model, are user-defined.