Fault Analyzes and Protection Strategies for MVDC Systems

Medium Voltage Direct Current (MVDC) is a new concept gaining its popularity due to increase of the transfer capacity and improved power quality of the distribution networks.The aim of this thesis is to investigate different short circuit faults in MVDC systems and proposing a protection strategy for each fault, furthermore, it is also to be analyze what happens when the fault occur on one side of the system. Whether it affect the whole system or that point.Using the MATLAB simulation, this study analyzed the symmetrical and unsymmetrical faults in MVDC and proposing the protection strategy for these faults.Line to Line to Line to ground and Line to Line to Line faults showed the same results and hence the same protection system was implemented. Pole to pole and double pole to ground has similar behavior and same technique was applied to control the faults and last but not the least Pole to ground has some unique results so different protection strategy was implemented.