Remote Coordination Adjustment of Power Electronic Devices in AC/DC Systems by Power Flow Calculation with Linearization and Sensitivity

High proportion of renewable energies and the installation of power electronic devices (PEDs) pose tough challenges to the operation of power systems. In this paper, the remote coordination adjustment (RCA) strategy of PEDs under stochastic scenarios is studied. The steady-state model for the AC/DC system with PEDs is first established, and the alternate iteration method based on linearization (AIML) is adopted, especially for efficient deterministic power flow (DPF) calculation. Then, the RCA strategy is proposed using a modular local sensitivity method combined with AIML, which can adjust the electrical variables by diverse PEDs with high efficiency. Additionally, the probabilistic power flow (PPF) calculation using the quasi-Monte Carlo method with the adaptive sampling number (ASN-QMC) is introduced to keep the balance between the computational efficiency and accuracy, as well as demonstrating the positive impact of RCA by the PEDs under stochastic scenarios. The effectiveness of the proposed methods is validated by a series of modified IEEE test systems.