Research On Power Problem Of Microgrid Based On Multiagent Consensus Control

In recent years,scholars from all walks of life have discovered that the traditional power grid has limited a certain extent through research,so they began to take note of the research of microgrid.Microgrid can be looked upon as a small type of distribution system,and microgrid is a new network structure made up of micro-power supply,energy storage device,monitoring device and other apparatus.The main effect of microgrid is to solve a variety of distributed distribution network problems quickly and efficiently.In order to convert the traditional power grid system into a smart power grid system,nations are developing and promoting microgrid and renewable energy vigorously,so that the power grid can realize the efficient supply of various energy forms to the load.Thus,the thesis discusses the application of multi-agent system in microgrid,and put forward a control method of microgrid based on multi-agent system.The concrete structure of this paper is as follows:Firstly,the thesis recommends the backdrop of microgrid and the latest research at home and abroad in detail.The basic operating principle,advantages and main technologies of microgrid are introduced respectively.Because the multi-agent technology has a series of advantages for instance autonomy,coordination,and learning ability,it can handle some control problems in the microgrid effectively.Hence,the corresponding control project is designed based on the multiagent system.This paper describes the advantages and application background of the multiagent system in detail,as well as the corresponding knowledge in order to make sufficient preparation for the controller design later.Secondly,smart power grid is a highly complex system formed by improving the traditional power grid and adding novel and complex communication control devices.In this thesis,the active power sharing problem of microgrid with event-triggered communication is studied.For the sake of realizing frequency stable and active power sharing under the unified frame,a distributed secondary control programme based on event triggered communication mechanism of sampled data is put forward,and the sampled data can only be exchanged between neighborhoods when the previously set trigger conditions are transgressed.Simulation results indicate that the proposed event triggering mechanism can reduce the needless communication data transmission evidently in the multi-agent microgrid system.Finally,this thesis reviews the matter of distributed reactive power distribution of microgrid based on AC inverter.Based on Lyapunov method,a novel distributed voltage controller with nonlinear state feedback for microgrid reactive power sharing is put forward.After that the controller is extended to nonlinear state feedback control with event-triggered communication by recommending a sample-holding strategy.The simulation results confirms the availability of the designed controller,and confirms that this event-triggered control method can not only reduce the communication volume of the microgrid greatly,but also reduce the requirements of accurate real-time information transmission between inverters with effect.