Research On Power Network Tear Power Flow With Distributed Power Generation

With the interconnection of power system,the scale of power network is increasing,especially in recent years,distributed generation power supply has been connected to grid,making power system power flow calculation more and more complicated,so in order to further improve the calculation efficiency of power flow calculation of large power grid,so this thesis has practical significance and theoretical value to study power flow of power network tearing method with distributed power generation.In order to study the trend of power network tearing method power flow with distributed power generation,firstly in-depth analysis of the characteristics of photovoltaic arrays and wind turbines in distributed power generation,the influencing factors of power system were given,and the mathematics model of PV arrays and wind turbines were established.Secondly the mathematical model of distributed power generation and power network model were combined to form a steady-state mathematical model of power network with distributed power generation.Based on tearing method power flow calculation methods,the advantages,disadvantages and adaptability of node tearing,branch cutting and unified diakoptics methods are comparative analyzed in depth,problems with power network tearing method power flow with distributed power generation are pointed out.Finally in order to quickly solve the large-scale power systems flow,this thesis presents a tearing method power flow based on generalized Tellegen's theorem with distributed power generation.In the processing of network blocks,firstly through the analysis of the characteristics of distributed power generation,tearing points and coordination variables of power network were determined,thus the three forms of tearing method power flow and power network mathematical model with distributed power generation corresponding to the three forms are given,and the processing methods of PI nodes and PQ(V)nodes are also given.Secondly generalized Tellegen's theorem is combined with tearing method power flow give the process of power flow of power network tearing method with distributed power generation.Finally a tearing method power flow based on generalized Tellegen's theorem is applied to analysis and calculation of power networks with distributed power generation.Through numerical simulation analysis,Tearing method power flow based on generalized Tellegen's theorem can be applied to power system with distributed power generation improve the calculation speed and reduce the calculation time,it is verified that this method validity and feasibility.