Читать книгу Mathematical Programming for Power Systems Operation - Alejandro Garcés Ruiz - Страница 22

As aforementioned, the unit commitment problem consists in determining the order of starting and stopping of the thermal units, taking into account the costs of turning-ON and turning-OFF, as well as the starting ramps. The optimization model is similar to the economic dispatch, but in this case, there are binary variables sk related to the state ON or OFF of each thermal unit. The most simplified model is presented below:

(1.9)

where f represents operative costs, h are costs of turning-ON and turning-OFF, r are starting ramps, and p_min, p_max are the operation limits of each unit. Binary problems are usually difficult; however, it is possible to find either convex approximation or MILP equivalents as presented in Chapter 5.