Hydrothermal Unit-Commitment Problem of a Large-Scale System with Representation of Forbidden Zones

As we move towards electrical networks with a growing presence of renewable generation, the representation components becomes more important. In hydro-dominated power systems, modelling forbidden zones hydro plants increasingly challenging as number increases. Such are ranges generation that either should be avoided or altogether unreachable. However, because representing introduces substantial computational burden, hydrothermal unit-commitment problems (HTUC) for large systems usually formulated ignoring zones. Nonetheless, this simplification may demand adjustments to solution HTUC, stations fall in practice, performed based on experience system operators and, then, can far from an optimal correction. paper, study impact explicitly hydro-generation large-scale than 7000 buses, 10,000 lines, and 700 units. Our findings show simplified model is current used deviate significantly zones, both terms plants, well thermal marginal costs.