Economic Analysis on Multi-Terminal VSC HVDC Systems with Wind Farms based on Hierarchical Optimal Power Flow with Stability Constraint

This paper aims at proposing novel methods for multi-terminal VSC HVDC system design and operation with large-scale wind farms. The paper is based on the hierarchical optimal power flow with small-signal stability constraint. Multi-terminal VSC HVDC (MTDC) system reinforcements are designed in the first step. The reinforcement capacities of the HVDC systems are designed by optimization process. Economic load dispatch in the reinforced system with MTDC is carried out in the next step. By the proposed method, multi-terminal VSC HVDC systems can be utilized more effectively even when wind production is not high. Several multi-terminal configurations are designed. Wind power hosting capacities, net present value, and profitability index of the systems are analyzed.