Research On The Calculation Method Of Flexible Transmission System With Distributed Power Generation

Power flow calculation is the most basic calculation of power system,and is also an important tool for power system analysis.Seeking for a simple and efficient power flow calculation method is one of the goals of the electric power research.In order to improve the control rate of low carbon new energy and the operation of power system,the current power system has centralized and distributed two ways for new energy to combine with it,and it is widely used control device composed of many power electronic devices,which leads to the complexity of power flow calculation.Therefore,combined with the characteristics of the current power system,this thesis studies the power flow calculation of the flexible transmission system with distributed generation,which has significance and application value.Taking the flexible transmission system containing distributed photovoltaic generation as the research background,it deeply analyzed the photovoltaic generation characteristics and related factors.Combined with the MPPT technology and grid connected control technology of inverter,the equivalent model of distributed photovoltaic power is established.On the basis of the analysis on the working principle of the unified power flow controller,a mathematical model of the typical flexible transmission control device UPFC is established.A distributed power generation is applied to flexible transmission system,and then a comprehensive mathematical model and equivalent simplified model for flow calculation of flexible transmission system with distributed photovoltaic power are established.The calculation method of flow in flexible transmission system on the Newton Raphson method is analyzed deeply,the calculation method of the flexible transmission system with distributed power taking into account of the specific characteristics of distributed photovoltaic photovoltaic generation,the model of classification,correction included in the equation and the trend of flexible transmission network.For fast convergence and improve the calculation method of flexible transmission system trend,the trend of flexible transmission system using the generalized Tellegen's theorem on distributed photovoltaic source calculation,the generalized Tellegen's theorem with distributed photovoltaic power transmission systems based on power flow calculation method.Based on MATLAB simulation platform,two kinds of Newton method and calculation of the generalized Tellegen's theorem based on the trend of 5 bus and 14 bus systems for power flow calculation,the results show the feasibility of UPFC control of photovoltaic power system containing the trend of the system of the power flow distribution is improved;and the two methods were comparison and analysis,this thesis verified the calculation method of the generalized Tellegen's theorem based on the trend of the effective and fast.