Research On MPPT Control Of Photovoltaic Array Based On CAHHO Algorithm

It is urgent to solve the energy crisis.In order to alleviate the energy pressure,the renewable energy represented by solar energy has been widely concerned.Although the rapid development of solar power can delay the loss of traditional fossil energy,the efficiency of solar power generation is greatly affected by temperature and light,especially the output power of photovoltaic array under local shading.Therefore,it is of practical significance to study the maximum power point tracking(Maximum Power Point Tracking,MPPT)control technology.Firstly,the working principle of photovoltaic cells is studied,and the output characteristics of photovoltaic cells are simulated and analyzed in MATLAB/Simulink environment.A brief description of the principle and characteristics of multi-peak output power of local shaded photovoltaic array is given,and three traditional MPPT control methods are expounded,and their advantages and disadvantages are verified by simulation.The MPPT control method based on the improved Cauchy Harris Hawk Optimization algorithm(Cauchy Harris Hawk Optimization,CAHHO)is proposed to solve the problems of the possible failure of the traditional MPPT control method under local shading and the slow tracking speed,low tracking accuracy and power oscillation of some common intelligent algorithm class control methods.CAHHO algorithm proposes to use tangent function to improve the calculation method of HHO energy factor,so that the algorithm can search the optimal solution globally in a large range in the early stage of iteration.In order to limit the algorithm to local solution,the current solution results are disturbed by Cauchy variation.The CAHHO algorithm is evaluated synthetically by typical function to verify its development ability and precocious ability,and then the CAHHO algorithm is used in MPPT control.Through simulation,the effects,advantages and general applicability of the proposed method are verified and analyzed under the conditions of stable environment,light change and local shading of photovoltaic cells.The Boost experimental platform based on STM32F334 is built to simulate uniform illumination and compare the MPPT control method of HHO algorithm to verify the feasibility and fast tracking of MPPT control based on CAHHO algorithm.The dissertation has 63 pictures,3 tables,and 67 references.