基于混合Petri网的HVDC控制系统模型的研究

高压直流输电(HighVoltageDirectCurrentTransmission,缩写为HVDC)控制系统是一典型离散事件和连续动态行为相互作用的混合系统,引入混合系统的有效建模工具:混合Petri网(HybridPetriNet缩写为HPN),根据HVDC控制系统的运行特性,采用HPN对HVDC控制系统进行建模。该模型将控制系统分成离散逻辑部分、连续动态部分和状态识别接口部分来描述。由离散逻辑部分进行协调HVDC运行方式的切换,连续动态部分进行实时调节,状态识别接口部分实现对系统状态的识别并驱动离散部分的改变。通过对结合国际大电网会议CIGRE标准系统的仿真,验证了基于HPN的HVDC控制系统模型在HVDC系统在正常及故障情况下均有良好的响应特性。

Model of HVDC Control System Based on Hybrid Petri Net

The hybrid characteristic of HVDC control system was described, which consists of continuous dynamic behaviors and discrete event behaviors. A powerful modeling tool for hybrid system - hybrid Petri Net (HPN) was introduced to model HVDC control system. The proposed model consists of discrete logic layer and continuous layer. The layers were connected by a state identification interface. The discrete logic layer switches HVDC control modes and coordinates regulators in the continuous dynamic layer. The continuous dynamic layer regulates the continuous state variable of HVDC system in real time. The interface identifies the system state and drives the state changes of discrete logic layer. Simulation results show that the proposed hybrid model responds well to normal and faults state of HVDC system.