Affiliation:
1. School of Automation, Central South University, Changsha 410083, China
Abstract
Single-phase solid-state transformers (SSTs) have the advantages of a compact structure, higher reliability, and multiple functions, and have been widely studied. However, bulky energy storage elements and inherent ripple power with double-grid frequency issues are the main disadvantages of conventional single-phase SSTs. This paper presents a single-phase matrix-type AC-AC SST eliminating ripple power with double-grid frequency. The presented SST consists of a line-frequency-commutated rectifier without bulky DC-link capacitors, an LLC resonant converter, a buck converter, and a line-frequency-commutated inverter. The LLC operates efficiently with a fixed voltage gain, and the buck converter provides a voltage regulation function. As a result, high conversion efficiency, high power density, and potentially high reliability are achieved. A 1 kW SST prototype is developed and tested to validate the feasibility and functionality of the proposed methods.
Funder
National Natural Science Foundation of China
Science and Technology Innovation Program of Hunan Province
JieBang Headed Program of Hunan Province
JieBang Headed Program of Changsha
Hunan Provincial Natural Science Foundation of China
Reference25 articles.
1. The Future Renewable Electric Energy Delivery and Management (FREEDM) System: The Energy Internet;Huang;Proc. IEEE,2011
2. Solid-State Transformers: On the Origins and Evolution of Key Concepts;Huber;IEEE Ind. Electron. Mag.,2016
3. Lai, J.-S., Lai, W.-H., Moon, S.-R., Zhang, L., and Maitra, A. (2016, January 20–24). A 15-kV class intelligent universal transformer for utility applications. Proceedings of the 2016 IEEE Applied Power Electronics Conference and Exposition (APEC), Long Beach, CA, USA.
4. Advanced Power Electronic Conversion and Control System for Universal and Flexible Power Management;Bifaretti;IEEE Trans. Smart Grid,2011
5. A 50-kVA Three-Phase Solid-State Transformer Based on the Minimal Topology: Dyna-C;Chen;IEEE Trans. Power Electron.,2016