Black-start strategy for power grids including fast cut thermal power units

The restoration of a power system after a black-out mainly includes following stages of black-start, network reconfiguration, and load restoration. The fast cut back (FCB) function of thermal power units assures the operation of auxiliary equipments after a power network black-out, which is helpful in black-start. This paper establishes a steady-state model of FCB units at the stage of black-start. Based on the established FCB unit model, an optimization mathematical model to maximize the total power generator output is constructed to get the optimal start-up sequence of units. A simplified algorithm is presented to solve this model. Considering the charging-time constraints of line branches, the obtained start-up sequence of units is corrected using the shortest path algorithm to get the start-up path of units. Case studies on the New England 10-unit 39-bus power system are given. The results indicate that FCB units make for power system restoration.