Fault detection and branch identification for HVDC grids

A multi-converter network, either radial or meshed, requires not only a means of clearing faults on the DC network but also means of detecting and locating these faults. The characteristics of these DC side faults are fundamentally different to those in AC systems and therefore a DC network protection system requires special consideration. This paper explores the types of fault currents and fault clearance methods within DC networks along with proposing a method of detecting and locating these faults.