Rerseach On Grid-connected Photovoltaic Output Considering Extreme Weather Factors

In recent years,China’s energy consumption gradually transform toward cleanliness,photovoltaic continually develop which represent renewable energy.China’s northwestern region is rich in solar energy resources,has large installed photovoltaic capacity.However,PV is vulnerable to the weather,its output has the characteristics of volatility and randomness.In addition,the northwestern region of our country has lots of desert land,which sandstorm is easy to happen.Sandstorm abnormal weather conditions can last a long time,and will result in a sharp rise in the PV output in a short time,resulting in great power fluctuations and poor climbing events,bringing great power fluctuations and incidents of poor climbing.Its frequent occurrence has seriously threatened the local power grid operation.Due to the current research on grid operation in sandstorm weather is almost blank,does not have the technical means to simulate the output characteristics of photovoltaic power plants in the relevant circumstances.Therefore,it is difficult to predict the PV output in advance,planning and scheduling can not be timely got,which has become a major issue urgently needed to be solved in the northwestern part of China.Therefore,it is necessary to study the related situation of sandstorms,and simulate the changing output,to analyze the possible impact on the stable operation of the power system,to provide the necessary technical support for the system.Response to the actual application requirements of the grid,this paper mainly studies the impact of sandstorm weather on PV output.Firstly introduce the research background,research significance and the development of related questions;Secondly,in order to simulate photovoltaic output.studied the principle and model of solar cell and the characteristics of the solar cell;Introduced the composition of grid-connected photovoltaic system,integrate solar cell characteristics,MPPT control methods and grid-connected photovoltaic system conversion efficiency,get the calculation method of grid-connected photovoltaic output combine the study of solar radiation model under sunny weather,get the grid-connected photovoltaic output calculation method which can calculate sunny weather conditions.Then in order to get the output under sandstorm weather,studied the sandstorm events,decompose the process,found the main impacts of dust weather on the PV output.Select the characterization factors to correct the weather conditions of sunny output model,which reflect the impact of different sandstorm weather.Combine with the actual sandstorm weather data to verify the feasibility of the model.The results show that the corrected model can reflect the changes brought by dust weather,which can reflect the changes in grid-connected PV output under dust weather conditions.Finally,discussed the impact of grid-connected photovoltaic output fluctuation on the system under sandstorm weather.Sandstorm weather will result in dramatic fluctuations in PV output,causes serious climbing events and greater frequency deviation.Therefore,the precise forecasting technology of the PV output on sandstorm weather conditions is of great significance.