Improved Reachability Analysis for VSC-MTDC Integrated Offshore Wind Farms Based on Adaptive Parameter Optimization

Abstract

To address the challenges presented by the complex nonlinear dynamics and limited disturbance resilience of offshore wind farms (OWFs) integrated via voltage source converter based multi-terminal high voltage direct current (VSC-MTDC) system under large disturbances, an improved reachability analysis method is proposed to capture dynamic behaviors of the system. The analysis framework encompasses: 1) high-dimensional nonlinear differential and hybrid models of VSC-MTDC integrated OWFs system are constructed based on Kron reduction method to enhance computational efficiency and mitigate the limitations imposed by algebraic constraints; 2) an adaptive time-step optimization algorithm is implemented to further improve computational efficiency while enhancing the capability to capture both transient and steady-state dynamics of hybrid system; 3) the improved reachability algorithm is designed to quantitatively analyze the operational states of VSC-MTDC integrated OWFs system under uncertainties and varying operating conditions. Case studies on VSC-MTDC integrated OWFs system are conducted to demonstrate the effectiveness of the proposed method in revealing complex nonlinear characteristics and safety verification under large disturbances.