COMPOUND CONTROLLED COLORED PETRI NET MODEL OF UNIT COMMITMENT

Here, the discomforts in the modeling of compound control system by Petri nets are improved, they are, various control conditions directly act to the controllable transitions and the transitions are divided into four sorts according to their control conditions, i.e., the time-transition, out-event-transition, uncontrolled transition and calculator-transition, and a compound controlled colored Petri net (CCCP) is put forward. Under a certain condition, because of the difference of the triggering colors one transition can belong to different sort, and the differences among the transitions mainly lie in different triggering conditions. Using the defined CCCP the unit commitment considering time dependent constraints is modeled and analyzed. Through the examples the action of CCCP to the modeling of complicated control problem, e.g., the unit commitment, is further expounded. The presented model provides a new modeling idea and an available solution.