Study And Design Of The Research-oriented Power Flow Algorithm Based On Matlab

Power flow is a basic calculation in power system analysis,it can be divided into research-oriented power flow and engineering-oriented power flow according to the different using purpose.Research-oriented power flow algorithm is mainly used as a basic computing tool in scientific research,the most outstanding feature of this algorithm is that the matrix will be easily modified and maintained,which makes this algorithm often be used for algorithm development.Matlab is gradually adopted by many researchers due to its powerful functions.In the research work,researchers need a fast-speed power flow program urgently to do necessary computing analysis of power system.In this thesis,the algorithms are designed from the two aspects which are circulation and matrix operations.Firstly this thesis studies the research-oriented power flow algorithm based on circulation computing,designs a looping method to form Jacobian matrix and skips the unnecessary operation to save time by confirming the bus type.Solving the linear equation algorithm is designed after the study on elements arrayed rule of the coefficient matrix and Matlab matrix storage rule.Secondly,this thesis studies the research-oriented power flow algorithm based on matrix operation,mainly designs an algorithm for the formation of Jacobian matrix.On the basis of the different thoughts of forming Jacobian matrix,matrix multiplication method,dot product method and repetitive matrix are proposed,which can also be divided into five different methods.Two algorithms are designed for the formation of the injection power,which are the direct computing method and the matrix element summation method.All kinds of matrix involved in power flow mainly are sparse matrix,so that this thesis adopted the sparse technology to manipulated these matrix and improved the computing speed.In this thesis,the Jacobian matrix is stored by the way of(2n x 2n)to facilitate element search and parameter modification in research work.At the same time,it also makes the algorithm has the possibility of second development.In addition,the calculation of 445-bus Northeast power system indicated that the algorithm can satisfy the use of scientific research and have a strong practical value.