Model Predictive Control Strategy for PV Station Boost Converter Based on Disturbance Observer

Compared to traditional AC power grids, DC power grids have the advantages of high transmission efficiency, high power density, and flexibility and controllability. DC transmission and distribution based on DC technology is one of the effective means to achieve large-scale PV grid connection. In order to achieve stable grid connection of distributed <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$P V$</tex> power station DC boost converters and good control of station level DC boost converters, an innovative model predictive control method based on linear discrete disturbance observer is proposed. This method designs two disturbance observers to improve the antiinterference ability of modular multilevel converters for AC side current control and circulating current control under voltage fluctuations and inductance parameter mismatches in the power grid. The simulation results have verified the feasibility and correctness of the proposed control strategy.