Micro- Gas Turbine Distributed Energy Systems Modelingsimulation And Optimization

Nowadays, Chinese energy structure is irrational, because the energy consumption of coal is dominant. While the world’s energy structure development trend is based on petroleum and natural gas, especially natural gas. And in the coal-dominated energy system, the energy required is based on hurting our environment. In order to ensure the long-term economic development, we must look for an efficient, clean and environmentally friendly mode of using energy.Micro gas turbine(referred to as micro-turbine) CCHP(combined cooling heating and power, CCHP) system is a typical energy cascade utilization system. Through the use of different grades of energy classification, it can provide power/ cold/ heat and other multiple forms of energy for users, so it increases energy efficiency. This paper established the C200 micro-turbine and LiBr refrigeration unit simulation model to study the system operation of a building which be as demonstration project by Matlab / Simulink simulation platform and data fitting methods. The main contents and results are as follows:This paper analyzed the working principle and thermal processes of the micro-turbine and the LiBr absorption Chiller cooling / heating detailed, and establishing mathematical physics equations. The micro-turbine CCHP system of the building was established by Matlab / Simulink simulation platform. The results from the micro gas turbine and LiBr absorption Chiller were compared with the data provided by the manufacturer to verify the accuracy of this model. On this basis, it combined with the electrical load, heating and cooling demands of the demonstration project building in Shanghai pudong new area, which be used for researching. The optimized model was based on system economy and got the best device configuration for the system. I selected C200 micro-turbine and LiBr absorption chiller to compose of micro-turbine CCHP system(MTC200-CCHP). Finally, the simulation model has been established to develop dynamic energy analysis of the building.For the demonstration project in this paper, the four micro-turbines worked in fully capacity, they can meet about 30% electricity demand of the building, and the rest through the grid to add. Hot and cold load priority provided by distributed energy systems, lack of partially staged combustion units by lithium bromide. LiBr units utilize waste heat can be obtained by 1048 ~ 1072 kW cooling capacity in Summer, accounting for 21.24% ~ 41.92% of users’ cooling demand; and it can made 959 ~ 992 kW heat in winter, accounting for 26.64% ~ 39.68% of users’ heat demand. Primary energy usage of the demonstration project micro-turbine CCHP system is 75.03% in cooling season and is 73.25% in heating season and is 74.22% in whole year.