Research On Diakoptics Of Power Flow And Its Application In Power System

Power flow calculation is the basis of power system analysis.The search for a simple,fast,convergent,and adaptable power flow calculation method has always been the focus of the power industry.Facing the huge modern power network with large-scale new energy generation access,the diakoptics is one of the effective methods to improve the efficiency of the large-scale power grid flow calculation.However,how to divide the large network and select the coordination quantity is the diakoptics flow The calculation is the key.Therefore,this article has carried out research on power system diakoptics power flow calculation,which has practical significance and application value.In terms of establishing the mathematical model used in the diakoptics power flow calculation,first,based on the basic framework and component elements of the modern power network,a unit-level mathematical model is established.In addition to the conventional mathematical models of "source" and "charge",the focus is on the establishment of mathematical models for photovoltaic,wind and other new energy power generation units.Secondly,combining the characteristics of new energy power generation and corresponding control methods,analyze the new energy power generation nodes and classify them according to the node types under different control methods.Finally,a comprehensive mathematical model of the modern power system with new energy is established.In the study of diakoptics power flow calculation,firstly,the typical basic diakoptics power flow calculation is compared and analyzed,and then the diakoptics is improved on this basis.The diakoptics power flow of the current injection type LU decomposition based on the generalized Tellegen theorem is given.Processing split nodes,coordination variables and different types of nodes in each sub-block,combined with the generalized Tellegen theorem,using its rapidity of forming an adjoint network model and the convenience of correcting Jacobian matrix elements,simplifying the power flow calculation In order to improve the calculation speed of the diakoptics power flow.Finally,the selection of split nodes and the division of diakoptics are combined with the specific actual situation of the complex power network,which enhances the adaptability of the application of diakoptics for power flow calculation.Through the simulation analysis of the calculation example,the calculation results of different splitting conditions are compared.The results show that the current injection type LU decomposition diakoptics based on the generalized Tellegen theorem in modern power systems can ensure the accuracy of the calculation while increasing the calculation speed and reducing The calculation time is improved,and the feasibility of improving the diakoptics is verified.