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http://dx.doi.org/10.5370/JEET.2017.12.4.1442

Application of Superconducting Flywheel Energy Storage System to Inertia-Free Stand-Alone Microgrid  

Bae, SunHo (School of Electrical and Electronic Engineering, Yonsei University)
Choi, DongHee (School of Electrical and Electronic Engineering, Yonsei University)
Park, Jung-Wook (School of Electrical and Electronic Engineering, Yonsei University)
Lee, Soo Hyoung (Korea Electrotechnology Research Institute (KERI))
Publication Information
Journal of Electrical Engineering and Technology / v.12, no.4, 2017 , pp. 1442-1448 More about this Journal
Abstract
Recently, electric power systems have been operating with tight margins and have reached their operational limits. Many researchers consider a microgrid as one of the best solutions to relieve that problem. The microgrid is generally powered by renewable energies that are connected through power converters. In contrast to the rotational machines in the conventional power plants, the converters do not have physical rotors, and therefore they do not have rotational inertia. Consequently, a stand-alone microgrid has no inertia when it is powered by the only converter-based-generators (CBGs). As a result, the relationship between power and frequency is not valid, and the grid frequency cannot represent the power balance between the generator and load. In this paper, a superconducting flywheel energy storage system (SFESS) is applied to an inertia-free stand-alone (IFSA) microgrid. The SFESS accelerates or decelerates its rotational speed by storing or releasing power, respectively, based on its rotational inertia. Then, power in the IFSA microgrid can be balanced by measuring the rotor speed in the SFESS. This method does not have an error accumulation problem, which must be considered for the state of charge (SOC) estimation in the battery energy storage system (BESS). The performance of the proposed method is verified by an electromagnetic transient (EMT) simulation.
Keywords
Converter-based generator; Inertia-free stand-alone microgrid; Power balancing; Pure renewable energies based system; Superconducting flywheel energy storage system;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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1 S. H. Kim, I. Y. Chung, and W. K. Chae, "Voltage and Frequency Control Method Using Battery Energy Storage System for a Stand-alone Microgrid," Trans. Korean Inst. Electr. Eng., vol. 64, no. 8, pp. 1168-1179, Aug. 2015.   DOI
2 W. H. Hwang, S. K. Kim, J. H. Lee, W. K. Chae, J. H. Lee, H. J. Lee, and J. E. Kim, "Autonomous Microgrid Design for Supplying Electricity in Carbon-Free Island," J. Electr. Eng. Technol. vol. 9, no. 3, pp. 1112-1118, Sept. 2014.   DOI
3 W. K. Chae, H. J. Lee, J. N. Won, J. S. Park, and J. E. Kim, "Design and Field Tests of an Inverted Based Remote MicroGrid on a Korean Island," Energies, pp. 8193-8201, Aug. 2015.   DOI
4 C. Zhang, L. Y. Wang, X. Li, W. Chen, G. G. Yin, and J. Jiang, "Robust and Adaptive Estimation of State of Charge for Lithium-Ion Batteries," IEEE Trans. on Industrial Electronics, vol. 62, no. 8, pp. 4948-4957, Aug. 2015.   DOI
5 P. Cheng and H. Nian, "Direct power control of voltage source inverter in a virtual synchronous reference frame during frequency variation and network unbalance," IET Power Electronics, vol. 9, no. 3, pp. 502-511, Mar. 2016.   DOI
6 P. Cheng and H. Nian, "Direct power control of voltage source inverter in a virtual synchronous reference frame during frequency variation and network unbalance," IET Power Electronics, vol. 9, no. 3, pp. 502-511, Mar. 2016.   DOI
7 Y. Hu and Y. Y. Wang, "Two Time-Scaled Battery Model Identification With Application to Battery Stage Estimation," IEEE. Trans. on Control Systems Technology, vol. 23, no. 3, pp. 1180-1188, May 2015.   DOI
8 X. Sun, Y, Tian, and Z. Chen, "Adaptive decoupled power control method for inverter connected DG," IET Renewable Power Generation, vol. 8, no. 2, pp. 171-182, Mar. 2014.   DOI
9 H. Nian, Y. Shen, H. Yang, and Y. Quan, "Flexible Grid Connection Technique of Voltage-Source Inverter Under Unbalanced Grid Conditions Based on Direct Power Control," IEEE Trans. on Industry Applications, vol. 51, no. 5, pp. 4041-4050, Sept. 2015.   DOI
10 Taylor & Francis Group, Boca Raton, Power System Stability and Control, 2nd ed., FL, 2007, pp. 113-114.
11 R. P. Alzola, D. C. Gaona, and M. Ordonez, "Control of Flywheel Energy Storage Systems as Virtual Synchronous Machines for Microgrids," in proc. of IEEE 16th Workshop on Control and Modeling for Power Electronics, pp. 1-7, July 2015.