Software development methodologies for network algorithms

This paper describes two methodologies applied to the development of power applications: approach A uses the concept of automatic code differentiation of standard Fortran or C code. This allows the automatic source code generation of code parts for the computation of first order derivatives. The other approach B uses the concept of systematic software reuse by defining a domain architecture. In this approach B an appropriate domain model formulates network and connected entities with behavior leading to the formulation and solution of systems of simultaneous nonlinear equations or to optimization problems consisting of partially separable functions