Study Of Fluid Dynamics Modeling Of Port Container Logistics

Because the solar energy is abundant,renewable,wide spreading and non-pollution,it is considered as the most important type of renewable energy.However,the performance of solar energy is easily affected by the impact of environmental factor,so how to improve the efficiency of photovoltaic power generation system is becoming a quite important research aspect.By detailed analyzing the operation principle and equivalent circuit of solar cell,the mathematic model of solar cell is built.Based on this mathematic model,the output characteristic of PV panel under various environmental situation is analyzed while the relationship between maximum power point and open circuit voltage under different irradiation and temperature condition.In order to control the operation point of PV panel,the DC/DC converter is choosing as the hardware for PV control algorithm.According to comparison among three typical topology of DC/DC converter,the Buck-Boost converter is chosen.The detail parameter design for Buck-Boost converter is given and the effectiveness of those parameter is proved by simulation result.According to the comparison analyzing among various tradition control method,it is clearly that the conventional fixed-step MPPT algorithm has common problem that the requirement for improving tracing speed and accuracy on MPP is conflict.On this basis,the conventional variable-step MPPT method is briefly introduced and analyzed.In order to overcome the drawback of tradition fixed-step and variable-step MPPT method,the variable-step MPPT method based on β parameter is proposed.By building an simulation model of photovoltaic power generation system based on Buck-Boost converter in Matlab-Simulink environment,simulation results of tradition P&O method and proposed βbased variable-step method is obtained.The comparison result among P&O and proposedβ based variable-step method shows proposed method obvious has faster tracing speed and accuracy of steady state operation.