Optimal Operation Of Residential Micro-grid In Harbin Area

With the deterioration of the air and environmental pollution,people are more and more urgent to reduce the emission of pollutants by using renewable energy.In this demand,electric vehicles and generation of distributed energy came into being.Because of its use of secondary energy as the power,electric vehicles do not need to use non-renewable energy transformed into a car driving force.Distributed generation of electricity through the wind or solar energy,the renewable energy in nature will be converted into electrical energy,instead of using coal as a starting material.Both of electric vehicles and distributed generation during the process of generating electricity will not produce pollute emissions of the atmosphere,so the government and users are interested in using electric vehicles and distributed generation of energy.To promote the development of electric vehicles and generation of distributed energy,the government has formulated various subsidy policies to encourage people to buy electric vehicles and use generation of distributed energy.At the same time,the use of electric vehicles and distributed generation of electricity to reduce pollutant emissions and use of non-renewable energy,the requirements of the grid is more stringent.When large-scale electric vehicles and distributed generation systems are connected to the grid at the same time,they may impact the grid,causing fluctuations of frequency and voltage in grid,which may affect the reliability of power supply.And with the addition of electric vehicles and distributed generation systems,the household micro-grid architecture has also changed.User-side power distribution changes with the changes of family micro-grid architecture.In order to solve the problem of power distribution in user-side in the case of optimal economy,this dissertation optimizes the distribution in user-side of electricity in a residential building in Harbin based on the characteristics of Harbin.First of all,according to the existing research,the structure of building-type home micro-grid in Harbin is pre-defined,and according to the existing models of each component of household micro-grid,the models suitable for this study are selected and transformed into mathematical models.According to the mathematical model of each component,add the objective function and the constraints of each part to form the optimization model.Then,through the statistics of the electricity consumption of all the users in the residential building,the capacity of the photovoltaic power generation system,the capacity of the household energy storage system and the electric vehicle capacity suitable for the residents of the residential building are selected.Based on the household micro-grid structure that has been selected for each constituent part of the household micro-grid,the optimization model of this paper is used to optimize the electricity cost and electricity distribution of a residential building in Harbin.The optimization results show that using the home micro-grid system can save user's electricity costs during the life cycle of the home micro-grid equipment.In the summer it can reduce the cost up to 55.3%.The distribution of electric energy adopts grid-side electricity purchase as the main source of electric energy in residential electricity.The electric energy provided by photovoltaic power generation is the secondary source.Electric vehicle electric supply is used to reduce the electricity consumption of users as a backup source.The research results of this dissertation can provide the basis for the structural design of micro-grid in Harbin,the way of energy distribution and the settlement of personal expenses.