Inductance Characteristics Elimination Method Embedding in Grid-Following Inverter with Consideration of Regulated Capacity Transformer

For the low voltage distribution area with regulated capacity transformer, the variation of transformer capacity will lead to the grid-side impedance change. This dynamic scenario increases the risk of harmonic resonance occurrence. Impedance model of low voltage distribution area with regulated capacity transformer and grid-connected inverter are built to analyze the system stability under different transformer capacities. Then, considering the various inductance characteristics of regulated capacity transformer, an inductance characteristics elimination method is proposed by inducing virtual negative inductance. Finally, simulations verify the correctness of the above analysis.