Maxmum Power Point Tracking Of PV System Under Partial Shadow

The shade sheltering and uneven illumination are the inevitable question in the field of Solar power,even though a small part of photovoltaic system by shading would influence other solar cell panels which are in the normal state.These would improve the normal battery loss rate and significantly reduce output power efficiency in the whole system.Under the Partial shading,there are ma,y peaks in the power output curve of photovoltaic cell,the traditional control algorithms failed.Towards extreme point problems about how to find one,two improvement method are proposed:one is the use of MPPT algorithm with multi extremum searching ability;two is improving the structure of photovoltaic array under the partial shades.At present The discussion towards array architecture is not enough at home and abroad.Aiming at Multi-Peak Value of P-V curve under the partial shades,this article is purposed SA-PSO which is based on SA-PSO is added up with SA selection mechanism Metropolis which is dynamic probability choose patterns.Before earlier stage of optimization,there are high probability to receive the state after updated particle.Don’t force stronger than the former state and increasing algorithm skipping for making it more easier to jump out local optimal solution.During later optimization,Particle update status could be received in a small probability and made the particles accurately reach the global optimal solution.This improved algorithm is excluded complicated parametric settings in the traditional algorithm,weak the impact of parameters on the results and validate this improved algorithm’s advantage in multimode optimization though intelligent algorithm test function.In the process of MPPT is based on SA-PSO,the particle stable link is introduced,ensure the particle stop at the optimal solution stability,make the global optimal value more accurately.A shaded solar cell will affect the whole system in centralized PV system.In order to solve this problem, a distributed MPPT control for photovoltaic system structure is discussed,this structure does not exist loss of mismatch between the PV module,because each module has independent MPPT controller and DC-DC convertor, so the distributed MPPT PV system is the most competitive in the future.Making different type solar can run in the same solar system,and better to adapt diffrent Vin and Vout, increase the flexibility of the system, A Bi-directional Buck-Boost converter is introduced, realize the diversity of battery in photovoltaic system.Finally, through the Matlab/Simulink and PVsyst simulation platform to verify the distributed MPPT control can effectively improve the output power of the photovoltaic system structure of photovoltaic system of partial shading conditions, and the structure can make the effective operation of different types of cells in the same system, increasing the flexibility of the system.