Power Analysis of Autonomous Microgrid

摘要

In the current increasing number of usage of microgrids is considered as an alternative of foreseen un-replenish source of fuel which continues to be improved in time. Question arisen for its power quality and stability during an event of fault to the system. Henceforth this study would experiment the effects of different placement and type of faults to a microgrid. This study is conducted using MATLAB for simulation of suggested models in experimenting with the fault type and their placement which differs by 2 kilometers. Fault is triggered for 0.3 seconds from 0.2 to 0.5 seconds. Data obtained from the simulations shows that in case of fault occurring at a location near to the PV cells, the power system has a higher stability during an asymmetrical fault than of symmetrical fault. In the case where the fault is triggered farther than the first location, the power system shows a higher stability from a symmetrical fault in comparison to asymmetrical fault. In terms of comparing types of fault, it is observed that symmetrical fault causes larger instability towards the power system when it occurs nearer to the PV cells contradicting that of asymmetrical fault. Droop control and fault current limiter are a few of the methods to mitigate this instability that occurs within an autonomous microgrid due to fault. For future researches, it is recommended that simulation should not only be limited using MATLAB software, other software such as PSS Adept should also be considered.