Piecewise Solution of Large Electrical Systems BY Nodal Admittance Matrix

This paper presents a new method for piecewise solution of large and integrated electrical networks and power system load flow problems applying principle of superposition, without involving diakoptics. This permits an average engineer to solve his large scale practical problems in pieces without having knowledge of terminology, topology and diakoptics. The method does not require development of intersubdivision matrix (model) as required in diakoptical method on the contrary calculates cut branch currents in a simple way. Necessary mathematical models are developed which represent the performance characteristics of the system. Subdivision solution models are developed in the form of nodal admittance matrix and solved in conjunction with optimally ordered triangular factorization to yield nodal voltages. The method provides full freedom in choosing the line of cut and reference node.