基于Petri网技术的继电保护建模研究

Model research of protective system based on petri nets theory

提出了保护系统建模方法。分析了保护系统的混杂特性及其数学描述,利用可编程赋时Petri网(PTPN)建立线路距离保护模型。该方法将保护系统的工作特性分成离散状态逻辑层和连续动态层来描述,由逻辑层协调各连续动态系统的模式切换。继电保护装置的输入量为连续动态层状态变量,继电保护装置的动作属于系统离散状态逻辑层的变化。在建立模型时考虑了自动重合闸与继电保护的配合。数字仿真表明保护的PTPN模型的可行性。

The paper proposes a modeling method for protective system and analyzes hybrid characteristic and mathematic representation of protective system. Model of distance relay is built using programmable timed Petri Nets. It divides protective system's working condition into discrete state logic layer and continuous state layer. A high-level discrete events supervisory is used to coordinate the actions of various subsystems. The inputs of relay are variables of continuous state and the operations of relay are discrete events of discrete state. The coordination of protective relay and autoreclosing circuit breaker is considered in building relaymodel. Simulation results prove its feasibility.