MATLAB-NS3 Co-Simulator Construction And Applications In Microgrid

Microgrid,which composed of a variety of distributed power supply equipment,energy storage,load and control monitoring and protection devices,can meet the load growth demand and improve energy efficiency and power supply reliability by supporting each other with large power grid.However,with the access of distributed renewable energy,uncertainty and uncontrollability are brought into the system.In addition,the stochastic characteristics of user side response and load change make the control and optimization of microgrids face great challenges.Real-time effective control and monitoring is becoming increasingly important and requires reliable communication network support.By setting up a real power system to evaluate the control design is difficult,costly and costly shortcomings.And simulation is a very effective way to evaluate the control design.The power system and the communication network are mutually coupled in the course of operating,and there are interactions between two systems.However,the traditional simulator on the power system side and the communication network side can only simulate the respective fields,and not combine the power system and the communication network to simulate,therefore it is quite urgent for co-simulation to simulate the operation of the whole system more accurately.Based on the above background,the research contents of this paper are as follows:Firstly,the network communication technology and control network architecture are analyzed in the microgrid,the performance requirements and difficulties of the communication technology are summarized in microgrid,and the needs of delay and bandwidth for the monitoring and control of the microgrid are analyzed according to the specific applications such as substation automation.In addition,because of the greatest influence of communication delay on the microgrid management,the influencing factors of the delay are analyzed from the perspective of communication technology.Secondly,the co-simulation architecture based on microgrid is proposed,and the feasibility of the co-simulation architecture is analyzed by discrete event system specification.The specific co-simulation architecture design includes the design of the interface module and the synchronization technology.In the aspect of interface design,three kinds of interface modules are proposed.The first is public module components,including interactive interface components,time management components,data management components and control algorithm components.These components are respectively used in power system simulator and communication network simulator The second category is the communication network component,this component belongs to the network simulation side,the network node application models are build to satisfy the needs of users in network simulator;The third category belongs to the power system side,the collection device or controller model are build in the power system simulator.In the aspect of synchronization technology,due to the traditional synchronization mode existing some shortcomings,in order to achieve more accurate and efficient joint simulation,an improved synchronization technology is presents in this paper.According to the proposed cosimulation architecture and the specific details of the design,a MATLAB-NS3 co-simulation platform is build.Finally,in order to compare the performance of the synchronization method and the traditional synchronization method,the case under different time scales are set up to carry on the co-simulation analysis.(1)The reactive power optimization and control problem of the distribution network is simulated,where the measurements from node are ayalyzed to optimize the reactive power output and reactive power control of distributed generation.(2)The ship power system reconstruction which belongs to the secondary control,aims to reconfigure the load in ship power network to achieve the goal of maximizing power supply considering the load priority and ensuring the important load of electricity requirements.The accurate and efficient of the synchronization method proposed in this paper are verified through the simulation results.(3)The simulation of voltage and frequency stability control in microgrids is carried out.The influence of network on power system control is analyzed,and the fluctuation of system frequency and voltage under different communication delay conditions is given.The simulation results of the above cases verify the exact and efficient characteristics of the synchronization method proposed in this paper,and confirm the effectiveness and correctness of the co-simulation platform.