Optimal selection of high voltage transmission connected to island systems

The development of high voltage technology provides technical conditions for the transmission of offshore new energy, but it is necessary to consider the operation status of power grid when we decide the way of grid connection. This paper focuses on the stability of the system and evaluates three access form - the high voltage alternating current (HVAC), traditional direct current (DC) and flexible DC transmission. Evaluation index and evaluation system are established. The evaluation index selects indicators from three aspects of static security, transient stability and short circuit capacity. Evaluation system is based on math method. It gets the indicators' weight through the game theory and uses intuitionistic fuzzy theory combining strict fitting degree to get the optimization choice. The theoretical analysis is based on the actual island model, evaluated through BPA simulations. Simulation results are presented to validate the expected performance of the proposed evaluation method.