Digital Implementation of I²t Protection Scheme by means of Solid-State Devices

The objective of this paper is to present the control loop design of the I ² t curve in the concept of Solid-State Circuit Breakers (SSCBs), which are applicable to the DC distribution network of the More Electric Aircraft (MEA). The proposed control scheme lies upon the introduction of a tripping time, in order either to avoid unnecessary circuit breakings. Moreover, the current breaking capability is tested through a simulation model by the aid of PLECS software and through an experimental scaled down test-bench. Finally, the current limiting strategy (i.e., the I ² t curve) is digitally implemented by the aid of a microcontroller unit (i.e., TMS320F28379D).