Summary:
This paper presents the multistage distribution network planning problem, utilizing conventional and non-conventional expansion measures. Here, conventional network expansions, i.e. transformers and lines installations, compete with load flexibility contracting. The proposed multistage planning methodology aims at minimizing the net present value of all investment and operational costs, while annuity calculations are used to make technologies with different characteristics comparable. A novel combination of the pseudo-dynamic planning approach called forward fill-in with a single-stage planning approach that utilizes load flexibility is developed. The single-stage distribution network planning model is based on the Tabu Search metaheuristic, which has proven to be scalable for realistic large-scale networks. In a case study, the multistage model is applied to a two-stage planning problem.
The results show clearly that the proposed multistage methodology is useful for planning studies. In contrast to single-stage methodologies, the multistage methodology not only allows to account for the time value of money, allowing to analyze savings due to network investment deferrals. But it also allows to demonstrate the value of flexibility contracting in distribution network planning. In the case study, flexibility contracting at a cost of 10 €/kW per year results in total cost savings of 15.68 %.
Spanish layman's summary:
Este artículo explora la planificación de redes de distribución en varias etapas, combinando refuerzos convencionales y mecanismos de flexibilidad. Minimiza los costes de inversión y operación mediante un modelo de búsqueda Tabu. En un caso de estudio con dos etapas, se muestra cómo este enfoque tiene en cuenta el valor temporal del dinero e identifica el valor de la contratación de flexibilidad, ahorrando un 15,68% con un coste anual de la flexibilidad de 10 €/kW.
English layman's summary:
This paper explores multistage distribution network planning, combining traditional and non-conventional expansions. It minimizes investment and operational costs using a Tabu Search model. In a two-stage case study, it shows how this approach considers the time value of money and highlights the value of flexibility contracting, saving 15.68% with an annual cost of 10 €/kW.
Keywords: multistage, distribution system, expansion planning, flexibility, realistic network
Registration date: 04/09/2023
IIT-23-358WP
