Research On The Capacity Optimal Configuration And Operation Of CCHP Microgrid With Coalbed Methane Internal Combustion Engine

The increasingly severe environmental deterioration and energy shortage have become an important factor restricting China's economic development.Looking for clean energy and renewable energy to replace traditional fossil energy,change the traditional mode of energy use,and improve energy efficiency have become an important measure of China's energy strategy reform.The combined cooling heating and power(CCHP)microgrid can achieve cascade utilization of energy,high energy efficiency.The CCHP microgrid also has the advantages of high safety and reliability,rich forms of energy supply and flexible control.With these advantages,the CCHP microgrid has become a hot research spot at home and abroad.Coalbed methane is a kind of clean energy with high calorific value,low emission and low pollution.It is an ideal way for the development and utilization of coalbed methane to utilize coalbed methane in the way of combined cooling heating and power,and to connect the CBM internal combustion engine as a distributed generation to the CCHP microgrid.The main content of this thesis is to use abundant CBM resources in coal mine area and combine local wind,solar and other renewable energy sources to build a CCHP microgrid,and study the optimal capacity configuration and operation.The main work is as follows:Firstly,this thesis introduces the development and utilization of coalbed methane at home and abroad,and the development and research status of CCHP microgrid at home and abroad.Then mathematical modeling and dynamic characteristics simulation of CBM internal combustion engine are carried out,and the working principles and operating characteristics of wind turbines,photovoltaic cells,batteries,waste heat boilers,absorption chillers and other major equipment in CCHP microgrid are analyzed and introduced.Established mathematical models of various types of equipment.Then,according to the evaluation indexes and constraints of CCHP microgrid,the capacity optimization configuration model of the CCHP microgrid with the minimum annual comprehensive net cost and the minimum standard coal consumption as the objective function was established,and a coal mine in Huainan area was used as a simulation example.Input the data of the coal mine's annual cooling heating and power load,local wind speed,and solar light intensity into the capacity optimization operation model,and use the NSGA-II multi-obj ective optimization algorithm to solve the configuration capacity of the main equipment in the CCHP microgrid,then obtain the results of capacity optimization configuration,and the results are analyzed.The results show that the construction of CCHP microgrid containing CBM internal combustion engines can bring considerable economic benefits,greatly save the cost of coal mine enterprises,and have important significance for reducing the consumption of coal and other fossil resources,improving energy utilization efficiency,and reducing carbon emissions.Finally,on the basis of capacity optimization configuration,the CCHP microgrid optimized operation model with the lowest typical daily operating cost as the obj ective function is established,and the hybrid particle swarm optimization algorithm and the particle swarm optimization algorithm are used to solve the model.Simulations were conducted for the typical winter and summer seasons in the coal mine area.The operating costs of the CCHP microgrid and the optimal dispatching operation results of various major equipment were obtained for the typical winter and summer seasons.