机组组合问题的复合控制有色Petri网模型

COMPOUND CONTROLLED COLORED PETRI NET MODEL OF UNIT COMMITMENT

文章针对有色Petri网对复杂控制系统建模的不便之处进行了改进:使各种控制条件直接作用于有色Petri网的可控变迁,将变迁分为时钟推进控制变迁、外部事件控制变迁、不可控变迁和计算用变迁四种,并提出了一种复合控制有色Petri网(CCCP)模型。在某些情况下,由于触发颜色的不同,同一变迁可属于不同的类型,各类变迁的区别主要在于触发条件不同。文章还利用定义的CCCP对考虑时间约束的发电机组组合问题进行了建模、分析,并通过举例进一步阐述了CCCP在对机组组合这类复杂控制问题进行建模时的作用。该模型为机组组合问题提供了一个新的建模思想和较好的解决方案。

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.