| By utilizing the abundant solar energy resource in high-cold and high-altitude area and developing the photovoltaic(PV)power generation technology can help build new energybased power system and the goal of "carbon peaking and carbon neutrality".PV array is greatly influenced by partial shading,high surface temperature,etc.,which decrease the output of PV power plant.Therefore,the experimental research on partial shading and surface temperature is of great significance to enhance the PV arrays output power.To explore the influence of the partial shading and surface temperature of modules on the PV array output power,based on theoretical analysis and MATLAB/Simulink modeling,the parameters of irradiance and surface temperature are changed to study on output characteristics of PV modules and array.At first,based on the experimental platform of PV arrays output power enhancement built in Lhasa,SP structure,BL structure,TCT structure,and a new RTCT structure are used to research on PV array output power under partial shading.The results show that both methods can reduce partial shading effects,and RTCT structure is the best.Secondly,DC optimizer is used to compare the output power of changing the topology of photovoltaic array under local shadow.The results show that the effect of adding DC optimizer is better.Lastly,based on cooling system continuous operation,stopping before starting,and started before stopping three conditions,constructed backplane cooling system by laying liquid-cooled circulating tubes,Comparative experiments of PV modules with and without backplane cooling.The results show that backplane cooling technology can reduce the surface temperature of PV modules,but it consumes additional power,and we can recycle the heat absorbed by the cooling medium to improve the overall efficiency.The results show that changing the topological structure of PV arrays,adding DC optimizers and adopting backplane cooling technology can increase PV arrays output power,which can provide technical reference for optimization design and operation of PV power plant. |
