Three-Phase Custom Power Active Transformer for Power Flow Control Applications

• Published in: IEEE transactions on power electronics Vol. 34; no. 3; pp. 2206 - 2219
• Main Authors: Elsaharty, M. A., Rocabert, J., Candela, Jose Ignacio, Rodriguez, Pedro
• Format: Journal Article Publication
• Language: English
• Published: New York IEEE 01.03.2019; The Institute of Electrical and Electronics Engineers, Inc. (IEEE); Institute of Electrical and Electronics Engineers (IEEE)
• Subjects: Active control; Automatització i control de l'energia elèctrica; Circuits magnètics; Coils (windings); Compensation; Constraint modelling; Convertidors de corrent elèctric; Distribució; Electric current converters; Electric power distribution; Electrònica de potència; Energia elèctrica; Energies; Enginyeria electrònica; Flow control; Integrated circuit modeling; Load flow control; Magnetic circuits; Magnetic cores; Phase transitions; Power; power control; Power flow; Power harmonic filters; Power transformers; power transmission; Reactive power; Transformers; Windings; Àrees temàtiques de la UPC
• ISSN: 0885-8993; 1941-0107
• DOI: 10.1109/TPEL.2018.2845702

This paper presents the three-phase custom power active transformer (CPAT), characterized by the integration of power electronics in a transformer to facilitate grid services. Such integration enables step-up/step-down transformation between primary and secondary as well as shunt and series compensation services to the power system through a single transformer. The CPAT can empower the grid with flexible ac transmission system and power quality services such as power flow control, reactive power compensation, active filter, and voltage regulation through a single monolithic transformer. In this paper, designs of the three-phase CPAT are realized and analyzed based on their equivalent magnetic circuit as well as their structure requirements and constraints. Simulation analysis of the three-phase CPAT clarifies its capability to actively regulate power flow between the primary and secondary windings as well as achieve grid harmonic current compensation. Moreover, through real-time simulations and an experimental prototype, the merits and performance of the three-phase CPAT were further validated.