Adaptive Hybrid Control Strategy for Grid-Connected VSCs Based on Model Predictive Control
With the widespread adoption of voltage-source converters for grid-connected new energy power generation, the transient stability of VSCs under high penetration of new energy has become a key issue in the construction of modern power systems. Grid-following (GFL) and grid-forming (GFM) controls each have their applicable scenarios and inherent limitations. Traditional hybrid synchronous control uses fixed parameters, making it difficult to adapt to complex and variable grid conditions. Therefore, this paper proposes a control method suitable for an adaptive hybrid synchronous architecture with grid-following and grid-forming dual characteristics, employing a model predictive control strategy to achieve dynamic adjustment of GFL and GFM control ratios in both the synchronization loop and the voltage loop. A simulation model was built in PSCAD/EMTDC to verify the effectiveness and adaptability of the proposed control method under various transient conditions, such as load changes and voltage sags. The simulation results indicate that the method can effectively suppress system frequency and voltage fluctuations, enhance the transient stability of VSCs, and provide a feasible control reference for practical engineering applications.