The Control Strategy of LCL Grid-connected Inverter Based on Hybrid Damping SMC in Weak Grid

In the distributed energy grid-connected system. the microgrid will exhibit weak grid characteristics due to the connection of the transformer and the long-distance transmission of the line. This paper proposes a hybrid damping sliding mode control (SMC) LCL grid-connected inverter control strategy under weak grid which makes the system have strong robustness, smaller tracking error and total harmonic distortion. The proposed control strategy can better suppress the harmonic influence oldie LCL filter under the hybrid dumping mode. Based on the traditional SAIC strategy. multiple resonance terms are introduced, which improves the ability of grid-connected current to track its reference value. Matlab\Simulink simulation platform verifies the effectiveness of the proposed strategy.