Quantized Event-driven Simulation For Integrated Energy Systems Dynamics

Integrated energy system(IES),as an important future direction in energy field,has attracted more and more attention.Effective simulation methods are important to analyze the interactions of multiple energy carriers in IES.Various energy technologies and numerous controllers participate in the energy management of IES.Energy infrastructure and information equipment are tightly coupled,which poses new challenges to simulation methods.The dynamic simulation models of electricity-heat integrated energy system(EH-IES)are constructed.A modified third-order quantized state system(MQSS3)algorithm is proposed for simulating the hybrid continuousdiscrete district heating system.Traditional numerical integration algorithm and MQSS3 algorithm are combined together to establish an event-driven co-simulation framework to efficiently deal with the EH-IES.The main contributions are summarized as follows:1)The dynamic simulation models of EH-IES are established.The basic structure,operation modes and equipment models of EH-IES are introduced.Considering the coupling dynamics of physical components such as heat networks,electric boilers and heat loads and information components such as temperature controllers,the hybrid continuous-discrete dynamic simulation model of district heating system is constructed.The dynamic simulation models of power distribution networks including distributed generators are established.2)MQSS3 algorithm for simulating hybrid continuous-discrete district heating system is proposed.The general form of hybrid continuous-discrete simulation model is introduced.The characteristics of time-discretized numerical method and quantized state system(QSS)method are analyzed respectively.The synchronous simulation mechanism of traditional numerical integration method is applied to QSS method.The quantized integration formula in vector form and explicit formula for calculating step size are used to update the state variables.The detection and location method of state event for MQSS3 algorithm are proposed.3)An event-driven co-simulation method for IES is proposed.The basic principle of event-driven simulation is introduced,and the complex dynamic characteristics of EHIES are analyzed.The principle of discrete event simulation is applied to the simulation of EH-IES.Power distribution system and district heating system are respectively solved using MQSS3 and time-discretized algorithms,and interact with each other through an event-driven interface.Dynamic simulations of an EH-IES are performed using the proposed simulation method with normal operation case and fault case to demonstrate the effectiveness of the proposed method.