Family of High-Gain Quadratic Symmetrical Active Impedance Network-Based DC-DC Converters with Fault Ride-Through Feature

Abstract

Certain applications like aerospace, bio-medical and devices operated in hazardous environment necessitate a dc-dc converter with a fault ride-through feature. In this paper, a family of high-gain converter structures with a fault ride-through feature is proposed. The proposed structures focus on reducing voltage stress on switches and diodes and improving the voltage gain. As a result of this focus, the efficiency of the proposed converters is improved. The operating principle, steady-state and small-signal analysis of the proposed converters are presented. All the proposed converters have fault ride-through capability, which makes the converter operational even when one of the switches fails. A detailed comparative analysis is performed to demonstrate the superiority of the proposed converters. The analytical performance of the proposed converters is validated with 500 W, 50 kHz hardware prototypes. The experimental results are provided for boosting 48 V input to 650 V output. The results showed that the proposed converters can be used in applications that need high voltage gain. Integration of a solar PV system using one of the proposed converters with a P&O algorithm is also explained. The proposed converters have symmetrical structures, reduced voltage stress, improved efficiency, and fault ride-through capability.