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Energies 2017, 10(5), 671; doi:10.3390/en10050671

Robustness Improvement of Superconducting Magnetic Energy Storage System in Microgrids Using an Energy Shaping Passivity-Based Control Strategy

1
Department of Electrical Engineering, Incheon National University, (Songdo-dong)119 Academy-ro, Yeonsu-gu, Incheon 22012, Korea
2
School of Information and Electrical Engineering, Harbin Institute of Technology at Weihai, No.2 in Wenhua Xi Road, Weihai 264209, China
*
Authors to whom correspondence should be addressed.
Academic Editor: José Gabriel Oliveira Pinto
Received: 15 February 2017 / Revised: 4 May 2017 / Accepted: 9 May 2017 / Published: 11 May 2017
(This article belongs to the Special Issue Power Electronics and Power Quality)

Abstract

Superconducting magnetic energy storage (SMES) systems, in which the proportional-integral (PI) method is usually used to control the SMESs, have been used in microgrids for improving the control performance. However, the robustness of PI-based SMES controllers may be unsatisfactory due to the high nonlinearity and coupling of the SMES system. In this study, the energy shaping passivity (ESP)-based control strategy, which is a novel nonlinear control based on the methodology of interconnection and damping assignment (IDA), is proposed for robustness improvement of SMES systems. A step-by-step design of the ESP-based method considering the robustness of SMES systems is presented. A comparative analysis of the performance between ESP-based and PI control strategies is shown. Simulation and experimental results prove that the ESP-based strategy achieves the stronger robustness toward the system parameter uncertainties than the conventional PI control. Besides, the use of ESP-based control method can reduce the eddy current losses of a SMES system due to the significant reduction of 2nd and 3rd harmonics of superconducting coil DC current. View Full-Text
Keywords: microgrid (MG); renewable power generation; superconducting magnetic energy storage (SMES); energy shaping passivity (ESP)-based control microgrid (MG); renewable power generation; superconducting magnetic energy storage (SMES); energy shaping passivity (ESP)-based control
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MDPI and ACS Style

Hou, R.; Song, H.; Nguyen, T.-T.; Qu, Y.; Kim, H.-M. Robustness Improvement of Superconducting Magnetic Energy Storage System in Microgrids Using an Energy Shaping Passivity-Based Control Strategy. Energies 2017, 10, 671.

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