Benders Decomposition-Based Power Network Expansion Planning According to Eco-Sizing of High-Voltage Direct-Current System, Power Transmission Cables and Renewable/Non-Renewable Generation Units

Abstract

High-voltage DC (HVDC) systems are taken into consideration while simultaneous generation and transmission expansion planning in this paper. It is based on the placement and sizing of generating units, AC transmission cables, and HVDC systems. Within HVDC system, reactive power of transmission network may be managed by AC and DC substations equipped with AC/DC and DC/AC power electronic converters, respectively. Plan takes the form of a bi-stage optimization, where the upper level aims to minimize yearly cost of constructing the items stated, while taking into account constraints related to size and investment budget. Minimization of yearly planning costs of generating units and the cost of energy losses are taken into consideration in the lower-level problem. Linearized AC power flow model and the operating parameters of both non-renewable and renewable generating units bind the goal function. To simulate the uncertainty of demand and renewable electricity, stochastic optimization is used. Utilizing the Benders decomposition approach, problem is solved and the best solution is extracted. Numerical outcomes derived from several cases demonstrate plan's potential to enhance transmission network's technical and economic features. In comparison to network power flow studies, the economic (operating) status of the network is improved by around 10% (10–40%).