Research On The Coordination And Protection Of Power System And Photovoltaic Power Source

Abundant solar energy resources,environmental protection,is a new kind of energy momentum of rapid development,many areas of our country and formulate corresponding policies,focus on the development of solar energy in order to meet the growing demand for energy.In this paper,the typical control strategies to build photovoltaic power and elctromachenical transient electromagnetic transient model,including: solar photovoltaic inverter model,model.The grid controller model,storage model,maximum power point tracking(MPPT)control strategy.The photovoltaic power model is proposed for power system electromechanical transient simulation,this model can be applied to BPA power system simulation.This paper studies the modeling process of photovoltaic board model,inverter model,grid controller model,energy storage device model and MPPT control strategy,based on the electromagnetic transient,dynamic and electromechanical transient process of photovoltaic power generation.Combination the existing electromagnetic transient model and steady-state power flow model,a grid-connected photovoltaic power generation system model suitable for electromechanical transient simulation of power system is proposed.The model uses the power decoupling control method.It only use the model and the external system interface at the active,reactive,and network bus voltage amplitude and phase angle.It interactive calculation with the grid to interact,and simulate the internal and external characteristics of photovoltaic power supply.Finally,the accuracy of the model is verified by PSASP.Based on the protection of the photovoltaic power supply,this paper qualitatively analyzes the fault characteristics of the PV power supply.By combining the theory and simulation results,the influence of PV power supply and grid connection on the current protection of power grid is studied.And through the simulation analysis of the photovoltaic low voltage crossing and island protection and automatic reclosing with the relationship.Finally put forward the allocation of distribution network protection recommendations.According to the actual grid structure in Inner Mongolia,the power system analysis software BPA is used to study the electromechanical transient caused by wind power grid connection.The failure characteristics of the grounding fault of PV system are analyzed emphatically.Provide advice for planning and operation of power grid by considering the typical operation mode and the study of photovoltaic electromechanical transient simulation model and the simulation calculation.