基于对象Petri网技术的电力系统故障恢复方法

应用Petri网技术求解电力系统故障恢复问题具有模型直观、过程清晰等优点,还能够描述恢复过程中的并发与资源竞争问题.但在利用Petri网对大系统建模和分析时会遇到组合爆炸问题,从而限制了它的应用范围.文章构建了基于面向对象Petri网技术的电力系统故障恢复计划生成算法,降低了大系统Petri网模型的维数,简化了建模和求解工作.通过分析给出了算法的对象划分、结构封装、对象间的消息传递关系以及图形化的建模;所设计的对象结构及对象关系保证了系统的安全性;引入了带有寻优意义的冲突消解策略,保证在有限资源的条件下得到优化的恢复方案;利用回溯策略解决了死锁问题.最后结合算例阐述了具体的技术方案.算例结果表明了该方法的有效性.

METHOD OF POWER SYSTEM RESTORATION BASED ON OBJECT-ORIENTED PETRI-NET TECHNIQUE

When Petri-net technique, which possesses the advantages of intuitional model and clear process, is applied to solve the fault restoration of power system, the concurrence and resource limitation in the restoration can be described. But when Petri-net is used in the modeling and analysis of large scale power system, the problem of combination explosion may be encountered, therefore its application range of Petri-net is restricted. Here, the object-oriented Petri-net technique based algorithm to generate the power system fault restoration schedule is built, thereby, the dimensionality of the Petri-net model for large scale power system is decreased and the modeling and solution are simplified. Based on the analysis the object partitioning, structure packaging, information transmission among the objects and graphic modeling are given, so the system security can be ensured by the designed structure of objects and the relation among the objects. Bring in the strategy to clean up the conflict with the sense of search, it is ensured that to obtain the optimized restoration schedule under the limited resources and using the recall strategy the deadlock is solved. The concrete scheme is illustrated by means of calculation example, the results of the example show that the proposed approach is effective.