Integrated Multiport Back-to-Back Power Converter for Type-4 Wind Turbine Generator with Hybrid Energy Storage System

TL;DR

This paper introduces an innovative multiport converter for type-4 wind turbines that integrates hybrid energy storage and enhances fault tolerance, improving power stability and safety during short-circuits.

Contribution

The paper presents a novel converter topology with fewer switches, a dual-buck structure for fault resilience, and integration of battery and supercapacitor for improved power smoothing.

Findings

Reduces switch count compared to traditional converters.

Enhances short-circuit fault tolerance with dual-buck structure.

Stabilizes power output and DC-link voltage under variable conditions.

Abstract

This paper proposes a novel integrated multiport bidirectional back-to-back power converter for a type-4 wind turbine that accommodates a battery and supercapacitor for energy storage. The circuit topology reduces 4 switches compared to the traditional configuration. Moreover, owing to the dual-buck structure embedded in the phase leg, the circuitry has no short-circuit path, therefore it withstands short-circuited events for a much longer time than the normal phase-leg and prevents the reverse current in turn-off recovery. The use of a hybrid energy storage system with battery and supercapacitor helps smooth out the power output under wind gusts and stabilizes the DC-link voltage under grid fault conditions. The case studies are carried out with a 1.5 MW wind turbine system. Simulation results are provided for the theoretical validation.