The Research Of Fall Prediction Method Based On Surface Electromyography

Solar photovoltaic power generation is one of the important ways for humans to use solar energy.In industry,photoelectric conversion is mainly accomplished through the photovoltaic effect of photovoltaic cells.In recent years,double-sided photovoltaic cells have become the new darling of the photovoltaic industry with the advantages of high photoelectric conversion rate,large power generation,and manufacturing process costs that tend to be conventional components.However,most of the research on double-sided photovoltaic cells is limited to its power generation principle,internal structure,and power prediction.The research on mathematical modeling and maximum power point tracking control algorithms of double-sided photovoltaic cells still needs further workThe main research content is divided into the following three modules:(1)Modeling and output characteristics analysis of double-sided photovoltaic modulesFirstly,a brief overview of the photovoltaic power generation system.Then a five-parameter model of the single-sided photovoltaic module is built,and the working condition model applicable to the actual engineering case is derived through simplification;Finally,the principle and structure of double-sided photovoltaic modules are analyzed.Based on the single-sided photovoltaic module model,four modeling methods are introduced.The four modeling methods are used to model and simulate the same double-sided photovoltaic module.After comparing the simulation results,the TN test method with fewer parameters,easier operation and higher accuracy was selected as the modeling method of the double-sided photovoltaic module model in the following(2)Modeling and output characteristics analysis of double-sided photovoltaic modules under partial shadingFirstly,the reasons for the formation of local shading and the harm caused by them are explained,and the "hot spot effect" is eliminated by introducing a bypass diode method.Then the multi-peak output phenomenon caused by the bypass diode is introduced,and the output formulas of the series and parallel connection of single-sided photovoltaic modules under partial shading are derived respectively.Finally,based on the single-sided photovoltaic module shading model and the double-sided photovoltaic module modeling method selected above,appropriate assumptions were made to derive a series and parallel shading model of the double-sided photovoltaic module.And through the simulation of the shading model,the influence of different shading forms on the double-sided photovoltaic array was explored(3)Research on Maximum Power Tracking Control Algorithm of Double-sided Photovoltaic Power Generation System under Partial ShadingFirstly,the principle of Maximum Power Point Tracking(MPPT)algorithm is analyzed,and the principles and processes of traditional MPPT algorithm commonly used under uniform lighting conditions are explained.The advantages,disadvantages and applicability of various conventional MPPT control algorithms are summarized.Then,in view of the shortcomings of the traditional algorithm,a particle swarm algorithm is introduced to solve the multi-peak function optimization problem,and the parameters of the particle swarm algorithm are adjusted to improve the maximum power tracking optimization effect.Finally,the improved algorithm is used to track the maximum power point of the double-sided photovoltaic power generation system with partial shade.According to the simulation results of the model,the improved algorithm can effectively and quickly track the peak power point.