Renewable Energy Integrated HVDC Power System Modeling for Transient Frequency Stability Online Assessment

Integrating large-scale renewable energy into the power system leads to a deepening nonlinearity power system. As a result, power grid frequency faces a more severe problem of online transient stability evaluation. Online simulation and evaluation analysis technology have proved to be a valuable tool for analyzing and studying the transient frequency stability of the power system under renewable energy integration. Aiming to solve these aforementioned problems, this paper proposes a multi-index evaluation method, which provides frequency transient safety and stability margin assessment based on detailed model simulations. This evaluation method has high model accuracy and an intuitive simulation analysis process, which can reflect the steady change trend of system frequency. Critical failure simulation verifies the effectiveness of the proposed method with online power grid information.