Multiple modular DC transformer for flexible HVDC application

A modular power electronic transformer for medium voltage application

In this paper a modular power electronic transformer (PET) for feeding critical loads is presented. The PE based transformer is a multi-port converter that can connect to medium voltage levels on the primary side. Bidirectional power flow is provided to the each module. The presented structure consists of three stages: an input stage, an isolation stage, and an output stage. The input current i...

Flexible Power Electronic Transformer for Power Flow Control Applications

This paper proposes a Flexible Power Electronic Transformer (FPET) for the application in the micro-grids. The low frequency transformer is usually used at the Point of Common Coupling (PCC) to connect the low voltage grid and utility network to each other. The conventional 50Hz transformer results in enhanced low voltage-grid power management system during grid-connected operation. In this pap...

Design of a Modular, High Step-Up Ratio DC-DC Converter for HVDC Applications Integrating Offshore Wind Power

Flexible Pulsed Dc- Source for Investigations of Hvdc Circuit Breaker Arc Resistance

The paper discusses the design of a flexible pulsed current source needed for experimental research of switching arcs in HVDC circuit breakers with passive resonance circuits. The source drives a current pulse from a pre-charged capacitor and forms it using an IGBT switch operated at 10kHz. The current source will be used to measure stationary and transient UIcharacteristics of switching arcs i...

Operation and Control Analysis of Modular Multilevel Converter for VSC-HVDC Application

Due to the scalability and flexibility in power transmission, the Modular Multilevel Converter (MMC) receives a widespread favor since its advent. The popularization of the MMC will continuously promote the developments in renewable energy grid connecting and flexible High Voltage Direct Current transmission (HVDC) system. In this paper, an overview of the most recent effort associated with the...