Magnetic Dual Coupled Boost with Recovery Stage DC–HVDC Converter for Renewable Energy Generator

This paper presents a new high-efficiency-high-step-up based converter integrating two non-isolated secondary interleaved coupled inductors with recovery stages dedicated to smart HVDC distributed architecture in renewable energy production systems. Appropriate duty cycle ratio assumes that the two recovery stages work with parallel charge and discharge to achieve high step-up voltage gain. Besides, the voltage stress on the main switch is reduced with a passive clamp circuit and thus, low on-state resistance Rdson of the main switch can be adopted to reduce conduction losses. In addition, the coupled inductors alleviate the reverse-recovery problem of the diode. Thus, the efficiency of a basic DC-HVDC converter dedicated to renewable energy production can be further improved with such topology. A prototype converter is developed, and experimentally tested for validation.