Time-Domain Based Fault Detection in DC Grids

In this chapter, we will look into the different approach of detecting the dc fault—time-domain methods. There are three different methods to be discussed: overcurrent, rate of change and capacitive discharge. The operation of each method is explained in detail. We obtain the fault signal from the simulation model and apply these methods to evaluate their performance. While they are effective in detecting dc fault, each has their own drawbacks. (1) Overcurrentmethod is only suitable for point-to-point configuration, (2) Rate of change method can be severely affected by signal noise, and (3) Capacitive discharge method requires more signals and computationally extensive.