Study On Energy Optimization Of Microgrid Integrated Energy System

As a carrier of integrated energy system,microgrid can effectively integrate local distributed renewable energy,which has attracted more and more attention in recent years.Microgrid is a kind of aggregation form of distributed power and controllable load.It can stabilize the fluctuation of wind and light power generation and improve its utilization ratio by optimizing the active power of controllable power.It can also be used as the schedulable resource of large power grid to participate in the peak load regulation and stabilize the load fluctuation.The micro grid integrated energy management system can effectively dispatch the internal distributed generation,heat generation and energy storage equipment,ensure the safe and reliable supply of all kinds of energy demand,such as electric heating and cooling,and realize the multi energy complementary and efficient utilization of all kinds of distributed energy.This paper aims at the operation optimization of common CCHP micro grid integrated energy system,on the premise that its capacity configuration has been determined,by optimizing the active power of each distributed energy equipment in each period,the economic operation of the system is realized.The main work of this paper is as follows:First of all,the development status of integrated energy system and Microgrid is introduced,and the important role of energy optimization of microgrid integrated energy system in microgrid economic operation is described.Secondly,the energy structure of the micro grid integrated energy system is established and the basic characteristics of the distributed energy and equipment in the micro grid are analyzed.The mathematical models of the distributed power generation device,energy storage device,gas boiler and refrigerator are established under the quasi steady state operation condition of the system.Thirdly,the load comprehensive demand response model based on the price demand elasticity theory is established,and the concept of human comfort and comfort PMV standard are introduced,and the flexible load model based on comfort is established.On this basis,the two-stage optimal scheduling model is established,which optimizes the user side and energy supply side of microgrid respectively,and the proposed scheduling model is verified by simulation examples The rationality of.Finally,a multi time scale optimal scheduling model of microgrid integrated energy system based on model predictive control is proposed,and its basic method and optimization process are described.The correction function of day dispatching to the day ahead dispatching plan is analyzed.Finally,the rationality of the model is verified by a simulation example.