Economy Optimization Configuration Scheme for the MMC-MTDC System with Renewable Energies

This paper proposes an economy optimization configuration scheme for the modular multilevel converter based multi-terminal direct current (MMC-MTDC) system with renewable energies. The economy optimization model for the MMC-MTDC system with wind, solar and hydro renewable energies is established, and the second-order cone programming relaxation method is adopted to solve the above model. The economy optimization results of the output of each power outlet end and the line capacity of the MMC-MTDC system are obtained. The case study based on a four-terminal MMC-MTDC system is carried out to validate the effectiveness of the proposed optimization configuration scheme.