Study on an Improved Model Predictive Control Strategy with Power Self-coordination for VSC-MTDC

Multi-terminal HVDC transmission based on the development of HVDC is an important way of power transmission of new energy in the future. But its control strategy is complex, especially the coordinated control between stations. A three-terminal parallel VSC-MTDC simulation model in the MATLAB/Simulink platform is built in the article. An improved model predictive control strategy with power self-coordination is put forward. A single converter station takes the model predictive control with power consumption as the cost function. And the coordinated control between converter stations is fulfilled by DC power control which is controlled by the cost function in model predictive control. Thus, coordinated control between converter stations and the control of converter are of organic combination through the cost function. When disturb occurs in any converter station except the main converter or one converter station is out of work, the main converter station provides the power compensation to ensure the system keep working, Without the need for additional coordinated controller design, greatly reducing the economic consumption, improving economic benefit. And each converter station is relatively independent, the system stability is better. In general, the simulation results prove the effectiveness of this method, which provides a new way for VSC-MTDC control.