Power electronic transformer with adaptive PLL technique for voltage-disturbance ride through

• 作者: Binshi GU Fangfang LUO Jianfeng ZHAO Jianhua WANG Jun YOU Qing DUAN Wei GU Zhendong JI
• 来源期刊: 现代电力系统与清洁能源学报(英文)
• 学科: 工学
• 关键词: POWER electronic transformer Mediumfrequency isolation Voltage-disturbance RIDE THROUGH POWER quality Stability
• 年，卷（期）: 2018,（5）
• 页码范围: 1090-1102
• 页数: 13页
• 分类号: TM41

摘要

The power electronic transformer(PET) has recently emerged as a type of power converter. It features the basic functions of power conversion and isolation as well as additional functions related to power quality control. A novel PET for a distribution grid called a flexible power distribution unit is proposed in this paper, and the energy exchange mechanism between the network and the load is revealed. A 30 kW 600 VAC/220 VAC/110 VDC medium-frequency isolated prototype is developed and demonstrated. This paper also presents key control strategies of the PET for electrical distribution grid applications,especially under grid voltage disturbance conditions.Moreover, stability issues related to the grid-connected three-phase PET are discussed and verified with an impedance-based analysis. The PET prototype is tested, and it passes the voltage-disturbance ride-through function. The experimental results verify the power quality control abilities of the PET.