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Home > Archive>Volume 6, Issue 5, 2018 >1090-1102. DOI:10.1007/s40565-017-0356-2
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Power electronic transformer with adaptive PLL technique for voltage-disturbance ride through
Author:
Affiliation:

1.Jiangsu Provincial Key Laboratory of Smart Grid Technology & Equipment, School of Electrical Engineering, Southeast University, Nanjing, China; 2.China Electric Power Research Institute, Beijing Key Laboratory of Distribution Transformer Energy-Saving Technology, Beijing, China; 3.Department of Electrical Engineering, School of Automation, Nanjing University of Science and Technology, Nanjing, China; 4.State Grid Nantong Power Supply Company, Nantong, China

Fund Project:

This work was supported in part by the National Basic Research Program of China (No. 2016YFB0900404), the National Natural Science Foundation of China (No. 51477030, No. 51207023), the Cooperative Innovation Fund of Jiangsu Province–the Prospective and Joint Research Project (No. BY2015070-18), the Basic and Prospective Science and Technology Project of State Grid Corporation of China (No. PD71-17-024), and the Fundamental Research Funds for the Central Universities (No. 2242017K40159).

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    Abstract:

    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.

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  • Online: September 22,2018

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