An Input-Voltage-Sharing Control Strategy of Input-Series-Output-Parallel Isolated Bidirectional DC/DC Converter for DC Distribution Network

Input-series-output-parallel (ISOP) isolated bidirectional DC/DC converter (IBDC) become a preferred scheme connecting high-voltage and low-voltage bus in DC distribution network. Input-voltage-sharing (IVS) among modules is essential to realize the stable operation of ISOP system. Nowadays, with large-scale access distributed energy sources loads grids, fluctuations voltage connected load frequent great, deteriorating IVS performance structure IBDC. To solve this issue, triple-close- loop strategy proposed paper. Compared conventional constant input impedance, reshapes impedance be full-order model containing high-order components sensitive fluctuation output voltage, control based on reshaped improves dynamics feature, maintains ideal power avoids false protection potential instability for IBDC under large fluctuation. Experimental results verify correctness effectiveness analysis strategy, providing feasible,efficient practical system