Research On Modeling And Simulation Of Micro-grid Including Cooling-Heating-Power Supply System

Micro-grid with micro combined cooling heating and power(CCHP)system has obvious advantages in coordinated development of regional industry and energy conservation and environmental protection.It is the power generation technology with new energy developed by all countries in the world now.At present,in the research of micro-grid,there are many kinds of distributed generation models and control methods,except for the whole operation control strategy of micro-grid.Meanwhile,the research on the refrigeration and energy saving of combined cooling and power system is relatively simple.In this paper,to solve the problem of the study,the whole operation control strategy of micro-grid is studied from the aspects of distributed generation operation theory,distributed power model building,rectifier control and integrated control strategy.Micro-grid with refrigeration and energy saving of CCHP system is studied from the aspect of refrigeration and energy saving at the same time.The main research contents include:Firstly,analyzing the operation theories of direct drive type wind power generator,photovoltaic cell,gas turbine and battery,and establishing simulation models of distributed generations with mathematical models in the PSCAD/EMTDC simulation environment for the operation simulation of micro-grid.The important role of gas turbine is expounded in the combined cooling heating and power system.Secondly,the control strategies of rectifier and integrated of direct drive type wind power generator and gas turbine are analyzed.Meanwhile,the maximum power point tracking theory of photovoltaic cell and charge and discharge control strategy of bidirectional DC/DC of battery are analyzed.Thirdly,the control strategy of constant power,constant voltage and constant voltage of micro-grid,and the advantages and disadvantages of the master and slave,peer to peer and multi Agent control mode of micro-grid are studied.A distributed power control method combining constant power and constant voltage and constant frequency is selected based on master slave control mode.Based on the micro-grid model established by PSCAD/EMTDC platform,the reliability of control strategy is verified.Lastly,the micro-grid structure described in this paper is the combined cooling heating and power system,and the advantages of the combined cooling heating and power system in the aspects of energy saving,environmental protection and economy are introduced with typical cases.From the point of view of thermodynamics analysis,studying on the refrigeration and energy saving of gas turbine,and pointing out several influence factors of refrigeration and energy saving of combined cooling heating and power system.Based on the analysis of influencing factors,some advices of refrigeration and energy saving of the CCHP system are given to improve...