Control of dynamic brake through heuristic rule

In this paper, it is shown that the application of a dynamic brake or thyristor-controlled braking resistor (TCBR) at the generator terminals enhances the power transfer limit over a transmission line greatly. Two types of dynamic brake configuration have been considered here: a 3-phase, bidirectional, full-wave, Y-connected, phase controlled conventional brake and a 3-phase, full-wave, thyristor-controlled rectifier bridge. A simple rule-based "ON-OFF" control law based on the focal measurement of generator output power and its derivative is proposed in this paper. Detail digital simulation studies using the PSCAD/EMTDC package have been carried out. A was found that with the insertion of the dynamic brake circuit and its associated control, the system is able to recover following 3-line-to-ground faults even at very heavy power transfer levels, which is mot possible otherwise.