Predictive control of converter switches in a multi-terminal HVDC system

In this paper, the Finite Control Set Model Predictive Control (FSC-MPC) is used to control the multi-level neutral point clamped converter of each station in a four-terminal VSC-based Multi-Terminal HVDC system (MTDC). Three stations of MTDC are controlled to track desired reference power and one station is controlled to keep the DC side voltage in the desired value. The FCS-MPC controller is designed to keep a tradeoff between current tracking error, switching frequency and capacitor voltage balancing. The measurement and computation delay is considered by applying two steps ahead prediction in control algorithm. The validity of the proposed controller is confirmed by simulations.