Research On Gauss Calculation Method Of Power System Steady-State

Load flow algorithm and state estimation algorithm are the basicest computation algorithm for electric power system.The primary algorithm of load flow is:Gauss load flow algorithm,Newton load flow algorithm and fast decoupled load flow algorithm,etc.Newton load flow algorithm and fast decoupled load flow algorithm are the most popular algorithm used now.But Newton load flow algorithm calculates ineffectively.And network parameter influences the convergence of fast decoupled load flow.So studying a high speed and reliable convergence load flow algorithm is significance.Load flow algorithm is the foundation of state estimation algorithm,and its progress can promote the performance of state estimation algorithm.Fast Ybus gauss load flow algorithm,three phase fast Ybus gauss load flow algorithm and Gauss state estimation algorithm for distribution network is studied based on Gauss algorithm in this paper.Firstly,Gauss load flow algorithm,Newton load flow algorithm and fast decoupled load flow algorithm are compared and the result shows that Gauss load flow algorithm has the advantage of efficient calculation and good convergence.But when there are PV nodes in the network,traditional Gauss load flow algorithm's convergence is bad and study in this field is requirement.Modification fast Ybus gauss load flow algorithm is studied.Network equations are created firstly and PV nodes equations can be gotten by eliminating PQ nodes.State elements factor table is founded to get the result of PV nodes.Calculate PV equations and put the result into the Gauss equations to get the result of PQ nodes.Secondly, convergence principle and application scope of the algorithm is studied.Asymmetric load flow analysis needs three phase load flow algorithm.Fast Ybus gauss load flow algorithm is used for three phase load flow analysis and three phase fast Ybus gauss load flow algorithm is studied.Network equations are created firstly and PV nodes equations can be gotten by eliminating PQ nodes.Fast Ybus gauss load flow algorithm is used to get the result of PV nodes.And PQ nodes' result can be resolved based on the PV nodes' result.State estimation algorithm for distribution network is studied.Modificat equations of injection power and voltage,and use Least-squares procedure to get state estimation algorithm for distribution network.The result shows the algorithm's convergence is bad.A modification algorithm is studied based on theory analysis to make calculation convergence reliablely.At last,the algorithm is used to compute asymmetric network.Fast Ybus gauss load flow algorithm and Gauss state estimation algorithm for distribution network are used in Anshan network.Singular problem of distribution transformer admittance matrix is solved by zero-sequence resistance attachment. Amend admittance matrix to make it suitable for line-voltage measuration. Zero-sequence component effects constriction.So its must be erased when computing.In the end of the paper,a load flow algorithm for anshan real network that some nodes have redundancy measuration and some do not have measuration is studied based on the feature of distribution network.