| The large-scale development and utilization of renewable energy has become the most significant trend in energy development today.As a new type of distributed renewable energy organization structure,microgrid fully follows the characteristics of resource distribution and power demand,and is an effective way to give play to the efficiency of distributed generation.How to make the energy in the microgrid be reasonably used is a very important issue.At present,in the research of microgrid optimization operation,there are few examples involving the influence of operating modes and weather conditions on microgrid operation optimization.This paper explores a new perspective on the optimization of the microgrid’s day-to-day energy optimization.It compares the microgrid’s day-to-day energy optimal scheduling under independent and grid-connected operation modes,and makes a comparison of the operating results of the various microgrid equipment units under different weather conditions.Inquired.The main work of this article is as follows:(1)Modeling of each equipment unit in the microgrid systemFirst,based on the power generation principles of wind turbines,photovoltaic generators and micro-gas generators,Considering the main factors affecting its output,corresponding mathematical models were established for them.Secondly,the battery is studied,and a mathematical model considering electric energy loss is established for it;Then,a waste heat refrigeration model for the micro-turbine flue gas waste heat utilization device and an absorption refrigerating machine was established,a mathematical model considering ice storage losses was established for the ice storage tank of the ice cold storage air conditioner,and an electric refrigerator for the ice storage air conditioner was established Mathematical model of electrothermal conversion;Finally,based on the load demand,a load characteristic model of demand-side house cooling was established.(2)Modeling multi-objective optimization models for microgridsBased on the model of each unit in the microgrid system,consider the constraints such as the electrical energy balance and the cold energy balance in the microgrid,and take into account the constraints such as the operating power and equipment capacity of each equipment unit.The goal is to keep the cost as low as possible and the proportion of the total new energy power generation of the microgrid on the power generation side as high as possible.A multi-objective optimization model for microgrids based on the coordinated operation of power and energy storage devices and loads was established.(3)Optimal operation simulation of multi-objective model of microgridA particle position mutation strategy is proposed to improve the multi-objective particle swarm optimization algorithm,which is u sed to solve the multi-objective optimization model of microgrid.Based on typical day weather data,simulations were conducted to study the effect of operation mode on the optimal dispatch of microgrid energy Based on the data of different wind and different light weather days,the influence of weather conditions on the optimal dispatch of microgrid energy was studied.Finally,the simulation results of NSGA-Ⅱ algorithm and improved multi-objective particle swarm optimization algorithm on typical day are compared. |
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