Hierarchical Frequency-dependent Chance Constrained Unit Commitment for Bulk AC/DC Hybrid Power Systems with Wind Power Generation

As the steady-state frequency of an actual power system decreases from its nominal value, composite load generally responds positively to lower consumption, and vice versa. It is believed that this damping (LFD) effect will be artificially enhanced, i.e., sensitivities loads with respect operational increase, in future systems. Thus, for wind-integrated systems, paper proposes a frequency-dependent chance constrained unit commitment (FDCCUC) model employs as dispatching variable so LFD effect-based can act supplemental reserve. Because deviation safely restricted, low-cost reserve sufficiently exerted upgrade wind accommodation capability normally confined by inadequate cope uncertain forecast error. Moreover, when FDCCUC applied bulk AC/DC hybrid consisting several independently operated regional AC grids interconnected DC tie-lines, hierarchically implemented searching algorithm proposed protect private scheduling information grids. Simulations on 2-area 6-bus 3-area 354-bus verify effectiveness hierarchical algorithm.