Research On Modeling And Control Of DC Microgrid With Gas Turbine

With the rapid development of distributed power generation technology,the effective use of new energy is the development of modern society needs,so some scholars put forward the concept of micro-grid,DC micro-grid to more efficient,energy-saving and low-cost power supply,Distribution network,the development of DC transmission technology,the application of distributed power generation technology and intelligent power network has far-reaching significance.In order to analyze the running characteristics of the DC microgrid and study its control mode,before the actual construction of the DC microgrid,the scholars need to use different simulation software to model and simulate the operation status of the DC microgrid under different conditions.The control strategy of all kinds of DC microgrids lay a solid theoretical foundation for the engineering application of DC microgrid.The simulation model of DC microgrid is modeled and analyzed,we first establish the mathematical model of photovoltaic cells,the correlation analysis and the photovoltaic power generation system control mode;secondly establish the mathematical model of permanent magnet direct drive wind turbine,and control mode analysis of mathematical model of PWM rectifier circuit;then the mathematical model of micro gas turbine the analysis,analysis of its control mode;finally established the mathematical model of the energy storage device,the research to control the charging and discharging.Analysis of DC micro grid operation control theory,introduces the hierarchical control theory and control strategy based on DBS;design of control of bidirectional AC-DC converter was put forward on the basis of an improved droop control strategy of grid connected operation;a DC islanding operation of the micro grid under the hierarchical control strategy,using two layer control theory,respectively.The equipment control layer and control layer of DC bus is analyzed.The simulation model and control strategy of the DC microgrid are analyzed.Analysis of DC micro grid operation simulation,bidirectional AC-DC rectifier under the condition of different operation modes,the simulation results show that the proposed improved droop control strategy can achieve a good control of DC micro grid operation;simulation analysis of 5 islanding operation modes of DC microgrid,the simulation results show that the stable the proposed switching layer control strategy can realize the coordinated control of DC microgrid and the running state.