Photovoltaic Small Signal System Disturbance Analysis Under Weak Electric Field

With the advancement of technology,people's living standards are improving,the demand for electricity is more extensive.The power industry has gradually progress towards a clean energy transition from fossil fuels once,hydroelectric power is currently one of the more stable of new clean energy.China is also to develop multiple new energy sources,including solar power,including the typical Sichuan and Tibet,PV base,while the proportion of PV connected to the grid has also increased,although not yet become the main force to generate electricity,but the PV industry has a place in the new energy generation.PV industry to develop the attendant stability when incorporated into the power grid.For the power system stability,the more likely to be overlooked is the static stability of small signal stability,while the system is unstable when a small interference effects is extremely serious.Thus ensuring power system small signal stability of power system optimization is an essential part.This paper analyzes the grid PV system access under conditions of weak,small interference stability analysis.Under the conditions herein set photovoltaic system modeling small interfering stable,including photovoltaic cells,inverters and controllers modeling grid,formation of a stable analytical model complete photovoltaic system small signal.Eigenvalue analysis method combines simulation proved that the system in case of being able to restore stability to small perturbations of its own.Taking into account the change in the maximum power point of photovoltaic cells,the occurrence of small perturbations,after participation factor and controller parameters can be modified,the oscillation results contrast with previous simulation results,effectively improve the stability of the system.Today's society is less about the small signal stability of paper,and small interfering related photovoltaic system stability is rare,this paper established a complete photovoltaic system small signal stability analysis,by the authenticity of the simulation shows that ideas,combined with the actual situation small signal stability analysis results PV maximum power point changes occur,effectively improve the system stability.In recent years,state support PV industry,we can see that China's photovoltaic network rate will also increase year by year,the net rate increase is caused by the PVsystem to improve the stability of the requirements,the paper can effectively improve the content of a single photovoltaic system small signal stabilizing effect on the stability of the entire PV system also played a role,for the occurrence of future large-scale photovoltaic power generation in the small perturbation instability has a certain extent.