The analysis of many preference relations in electric power system expansion planning

There exist different methods for solving the perspective planning problems in terms of the multiplicity of a system of preferences. For some methods, solutions may be called optimal, in more complicated methods a set of better solutions as compared to the considered ones are found. The final choice can be made on the base of different informal procedures. No unique method that is recognized as best exists. In fact, the chosen solution is controlled by two or more methods or their combination. The paper considers such an approach. We also present methods that are based on the analysis of a system of expert´s preferences