Assessing Dynamic Response of MTDC Offshore-Onshore Energy Systems for Stability Enhancement in Hybrid Power Systems

This study investigates the dynamic performance of hybrid power systems, with a focus on Multi-Terminal Direct Current (MTDC) interconnected offshore-onshore systems, under various disturbances. Conventional performance metrics such as Rate of Change of Frequency (RoCoF), commonly used for AC systems, are utilized to assess frequency response. Additionally, a modified Rate of Change of Voltage (RoCoV) metric is proposed to capture DC voltage behavior. The effectiveness of these metrics is evaluated through simulations involving various disturbances, including generator outages, line outages, converter outages, and faults. The results demonstrate the ability of the proposed metrics to effectively capture the impact of disturbances on system response, while also identifying limitations in capturing oscillating responses. Furthermore, the parametric sensitivity of control parameters in the converter’s outer control loop is analyzed to assess their influence on system behavior.