Abstract
Power electronic conversion plays an important role in flexible AC or DC transmission and distribution systems, integration of renewable energy resources, and energy storage systems to enhance efficiency, controllability, stability, and reliability of the grid. The efficiency and reliability of power electronic conversion are critical to power system applications. One way to enhance the efficiency and reliability of power electronic conversion is soft-switching technology. This paper introduces a generic zero-voltage-switching (ZVS) technique based on silicon carbide (SiC) power device. Using the proposed ZVS technique, all semiconductor switching devices in a power converter can realize ZVS operations. Next, the applications of the ZVS technique in different power electronic conversion systems such as photovoltaic inverters, wind power systems, energy storage systems and flexible AC transmission system devices are discussed. Finally, as an example, the operation performance and efficiency improvement of a SiC metal-oxide-semiconductor field-effect transistor (MOSFET) ZVS back-to-back converter are discussed.
Highlights
The increasing applications of renewable energy and distributed power generation have become a driving force for an increasing use of power electronic conversion in power systems [1]
The limitation of switching frequency further restricts the dynamic characteristics of the flexible AC transmission system (FACTS) device
This section introduces the applications of these ZVS topologies in power electronic conversion systems for renewable energy integration, energy storage systems and FACTS devices
Summary
The increasing applications of renewable energy and distributed power generation have become a driving force for an increasing use of power electronic conversion in power systems [1]. The application of SiC-based power conversion in utilities, including the FACTS devices, power electronic interfaces for distributed energy resources, and energy storage systems, can significantly improve the efficiency and reliability of the system, and reduce the system weight and volume. It is a promising technology for future flexible power systems with high-penetration renewable energy. To further enhance the performance of SiC-device-based power converters, soft-switching technique is a promising technology, and can handle the aforementioned concerns by turning the power device on and off with a slower voltage and current slope to reduce EMI noise. Experiment results on a 10 kVA ZVS back-to-back (BTB) converter prototype using a SiC MOSFET validate the efficiency improvement compared with that of the conventional two-level hardswitching BTB converter
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