Design Of Power Electronic Transformer Research Articles

High Frequency Breakdown Characteristics of Alumina Filler Content Epoxy Resin

Power electronic transformers have high insulation frequency and compact insulation structure, and insulation performance is one of the main factors restricting their further development. Epoxy resin is an important insulating material in the electrical industry, its thermal conductivity and mechanical properties can not meet the needs of high-frequency transformers, usually metal oxide (Al2O3, etc.) is added to form composite insulation material. It is of great reference value for the insulation design of power electronic transformer to study the insulation performance of composite insulation materials with different filler content ratio under high-frequency AC. The effects of power supply frequency and alumina filler content on the breakdown performance of the composite were investigated experimentally. The results show that the breakdown voltage of pure epoxy resin decreases exponentially with frequency. At any filler content, the breakdown voltage of epoxy resin decreases with the increase of frequency, and the decreasing trend gradually slows down when the frequency increases from 50Hz to 1000Hz, and the decreasing trend gradually increases when the frequency increases to 2000Hz. The breakdown voltage of epoxy resin showed a down-rise-down trend with the increase of filler content, and the effect of filler content on breakdown voltage gradually weakened with the increase of frequency.

Analysis and Design of Power Electronic Transformer for Smart Grid Application

With the development of smart grid and energy Internet, power electronic transformer has become one of the key equipment in power system. Its characteristic research and structure design have become a hot topic in related research fields. In order to take into account, the access of traditional AC motor system and renewable energy system, a three-stage power electronic transformer simulation model based on Simulink platform is built in this paper, and the key characteristics are analyzed and verified. With the application of power electronic transformer, the AC voltage can be adjusted quickly, and the AC / DC interface can be taken into account in the transmission system.

Analysis and Design of Power Electronic Transformer based Power Quality Improvement

A new type of transformer based on Power Electronics (PET) has been proposed in this paper, which realizes voltage transformation, galvanic isolation, and power quality improvements in a single device. The PET provides a fundamentally different and more complete approach in transformer design by using power electronics on the primary and secondary sides of the transformer. Several features such as instantaneous voltage regulation, voltage sag compensation and power factor correction can be combined into PET. This paper presents a novel topology of power electronic transformer. In the design process, the AC/DC, DC/AC, AC/AC converters and high frequency transformer have been used. One matrix converter operates as AC/AC converter in power electronic transformer. The designed power electronic transformer performs typical functions and has advantages such as power factor correction, voltage sag and swell elimination, voltage flicker reduction and protection capability in fault situations. The proposed power electronic transformer has been modeled using MATLAB/ SIMULINK and Power quality improvement with proposed model has been verified by the simulation results. KeywordsPower electronic transformer; AC/AC Matrix converter; Power Quality; High Frequency Transformer; Space vector Technique