Optimal direct voltage control of MTDC grids for integration of offshore wind power

This paper presents an optimal control of multiterminal high voltage DC (MTDC) networks. The conventional methods of controlling direct voltages of MTDC networks suffered from serials of issues, such as lack of ability to steer the power flow, less expandability to scale up and poor dynamic responses. In this paper, an innovative strategy of regulating DC voltages is derived through three main steps: calculation of DC loads flow, optimization of power flow and N-1 security for MTDC networks. Further, this strategy is numerically tested by incorporating the loss minimization in a MTDC network. The advantages of the control strategy are verified by simulations using MATLAB/Simulink package.