Research On Reconstruction Of TCT PV Array And Its Maximum Power Output

With the increasing demand for energy and environmental pollution,the development and utilization of new energy is imminent.Due to the advantages of no pollution,large storage and wide distribution of solar energy,more and more countries pay attention to it.When photovoltaic cells are installed outdoors,they are greatly affected by environmental factors,which restrict their power generation efficiency.Therefore,it is of great significance to study the output power of photovoltaic system,analyze and optimize its output characteristics.This thesis analyzes the equivalent circuit model and engineering mathematical model of photovoltaic cells,builds the simulation model of photovoltaic cells and arrays,simulates the influence of irradiance and temperature on the output characteristics of photovoltaic cells,the output characteristics of three photovoltaic array structures,series parallel(SP),bridge link(BL)and total cross tied(TCT),and the TCT light under shielding V array mismatch mechanism.The simulation results show that the PV engineering model is suitable for building the simulation model of the PV array.The output power of the PV array is greatly affected by the irradiance.The output power of the TCT PV array is the largest and the number of local peaks is small.The irradiance distribution of the parallel groups of the TCT PV array is uneven.The multi knapsack model of TCT photovoltaic array is established,and the multi knapsack model solving method based on greedy algorithm is proposed to realize the optimal reconstruction of electrical connection under the premise of constant physical position of TCT photovoltaic array,improve the maximum output power and reduce the number of local peaks;the parallel group with low photocurrent is compensated by additional photovoltaic components,and each parallel group needs to be compensated by fuzzy control algorithm The output power of the photovoltaic array is close to the generation efficiency when there is no shelter.Simulation and test verify the effect of reconstruction and compensation.Combined with the traditional maximum power point tracking method,a photovoltaic system simulation model is built to realize the maximum power point tracking of TCT photovoltaic array based on the constant voltage method and the conductance increment method.The simulation results are compared before and after the reconstruction compensation of TCT photovoltaic array.