Model predictive control based coordinated control of multi-terminal HVDC for enhanced frequency oscillation damping

Abstract

This paper presents a coordinated power control strategy based on Model Predictive Control (MPC) for Multi-Terminal HVDC (MTDC) to enhance the system frequency oscillation damping. Due to the available transmission capacity margin of HVDC links, MTDC buses have power regulation flexibility. With the proposed control strategy, the MTDC buses dispersed at different locations are efficiently coordinated to optimize the power flow of the grid to damp the frequency oscillations fast and timely. Besides, by the sensitivity analysis, the impact of the power injections at MTDC buses on the system frequency is quantified. By using the real-time sampling data of the Wide Area Measurement System (WAMS), the linearized power system model can be estimated on-line and used as the prediction model of the MPC. The simulation results show that the proposed controller can efficiently improve the system damping performance during frequency events.