An Improved Switched-Inductor-Capacitor Z-Source Inverter with Enhanced Boost Capability and Reduced Voltage Stress
Year: 2026
Type: preprint
Abstract: This paper proposes an improved switched-inductor/capacitor Z-source inverter (ISLC-ZSI) with enhanced boosting capability for single-stage DC–AC conversion in low-voltage renewable energy systems. The impedance network is derived from the improved switched-inductor Z-source inverter by replacing the central diode of the switched-inductor cell with a capacitor and reconfiguring the network to maintain continuous input current. This modification provides a high boost factor at a relatively small shoot-through interval, enabling operation over a wider modulation range. In addition, the ISLC-ZSI alleviates the electrical stress imposed on capacitors, diodes, and active switches compared with representative high-gain Z-source and switched-inductor-based topologies a unified ground path between the DC input source and the DC-link stage is also preserved, providing an advantageous feature for renewable-energy interfaces. The operating modes and steady-state characteristics are analyzed, and analytical expressions for the boost factor, voltage gain, and component voltage stresses are established. A comprehensive comparison with recently reported impedance-source inverters is conducted in terms of component count, boosting performance, voltage gain, input-current continuity, and device stresses. Finally, simulation and prototype experimental results validate the theoretical findings and confirm the effective operation and practical feasibility of the proposed ISLC-ZSI topology under representative operating conditions.
Source: Research Square
Language: English
Topic: Advanced DC-DC Converters
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7204854846