| With the rapid development of high-speed railway,high-speed EMU has become an important research hotspot.EMU has many advantages,such as large passenger capacity,high punctuality rate,fast speed,comfort and convenience.However,with the increase of operating years,how to improve the stability,reliability and safety factor of EMU and how to achieve energy saving,emission reduction and environmental protection are the future development direction of EMU.Therefore,this thesis combines the stability,reliability,energy saving and environmental protection requirements of EMU,and puts forward the idea of installing solar panels on the roof of EMU and uses photovoltaic power generation to supply power for the equipment inside the vehicle.The specific contents are as follows.(1)Based on the analysis of operation characteristics,current power supply defects and roof condition of high-speed railway EMU,and combined with the background of new energy and microgrid,the design idea of using the free space of EMU roof and installing solar photovoltaic panels to supply power for auxiliary equipment of EMU is put forward.(2)Taking China Railways High-speed 2(CRH2)EMU as the specific research object,based on the roof equipment and condition of EMU,the selection and installation scheme of photovoltaic panels on roof are studied and discussed.The original auxiliary power supply system of CRH2 EMU is analyzed.Based on the type and parameter characteristics of auxiliary equipment,the overall structure of the power supply system after connecting with photovoltaic devices on roof is designed.(3)According to the installation scheme,device selection and power supply scheme of the photovoltaic panels on the roof of the EMU,through data analysis and theoretical calculation,the impact of the installation of photovoltaic panels on the EMU in high-speed operation environment is analyzed in detail,and the effects of economic benefits,energy saving and emission reduction after installation of photovoltaic panels on the roof of the EMU are analyzed and explained.The research shows that the installation of photovoltaic panels on the roof of EMU has a small impact on the air resistance,train weight and traction power of EMU,which meets the actual demand.At the same time,the annual power generation capacity of each CRH2 EMU is 1.75 million kWh,which saves 100,000 yuan per year and reduces 58 tons of carbon dioxide emissions.It has great significance and practical value in energy saving and emission reduction.All these indicate the feasibility and necessity of this design concept.(4)Under normal working conditions,the roof photovoltaic power generation system can cooperate with the original power supply system and supply power through grid-connected.Through comparative analysis of various grid-connected control strategies of photovoltaic inverters,according to the operation characteristics and power supply scheme of EMU,Deadbeat control of grid-connected photovoltaic inverters for roof photovoltaic power generation system of EMU is finally selected.Based on this,the principle of Deadbeat control strategy and power supply scheme are studied and analyzed.The simulation model of roof photovoltaic devices connected to the grid to supply power to auxiliary equipment under normal conditions is built by MATLAB/Simulink simulation software.The feasibility and correctness of the power supply scheme and control strategy are verified by changing light intensity and load.(5)When power supply failure occurs in EMUs,the roof photovoltaic power generation system is disconnected from the original power supply system and operates in isolation.In order to restrain the intermittence and fluctuation of photovoltaic system,the power supply structure and scheme of photovoltaic system with on-board batteries are proposed.By comparing and analyzing various control strategies of islanded microgrid of photovoltaic system,and according to the characteristics and power supply scheme of EMU after power failure,a peer-to-peer control micro-grid based on Droop control inverters suitable for islanded operation of EMU photovoltaic power generation system is finally selected.Based on this,the principle of Droop control strategy is studied and analyzed.The simulation model of roof photovoltaic devices and batteries supplying power to important auxiliary equipment independently is built by MATLAB/Simulink simulation software.The feasibility and correctness of the power supply scheme and control strategy are verified by changing the size of important load. |
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