Simulation Study On The Improving Transient Stability Of Large Scale Photovoltaic Grid Connected By BESS

Photovoltaic power generation technology is regarded as one of the main power generation technologies to replace the traditional fossil energy power generation because of its characteristics such as living,non-pollution,abundant reserves and so on.Because the photovoltaic power generation is easy to be affected by the environment change,the output power of the photovoltaic power generation has the characteristic of random fluctuation.With the constant increase of the installed capacity of grid connected photovoltaic power station,the power fluctuation will cause different degrees of impact on the power grid,which will affect the safe and stable operation of the power grid.Large scale energy storage technology is the key technology to solve the bottleneck of the grid connected photovoltaic power station,the battery energy storage technology because of its fast response speed,higher energy density than advantages,is widely used in new energy to stabilize the output of power peaking FM scene.So the research on the transient characteristics of optical storage joint and grid connected operation has been widely concerned at home and abroad.It is the basis of the research on the electromechanical transient model of the photovoltaic power station and the battery energy storage system.In China's traditional simulation software PSASP,the simulation model of large scale grid connected photovoltaic power plant is still not complete,cannot accurately reflect the dynamic characteristics of grid connected photovoltaic power plant,the software is the lack of the establishment of energy storage system model,thus limiting the application of simulation software in the new energy grid in the simulation analysis.According to the above,in the detailed analysis of grid connected photovoltaic power station and battery energy storage system based on the topology,the establishment of large-scale photovoltaic power station connected to the grid and the battery energy storage system in electromechanical transient model using PSASP UD,through the examples and the corresponding conditions set the model for simulation,combined with the Qinghai power grid engineering cases in the light of analysis of dynamic characteristics and storage and network fault and fluctuation of grid connected photovoltaic power station system adjustment effect,while a brief discussion of access location and photovoltaic access capacity configuration.