Coordinated‐control strategy of scalable superconducting magnetic energy storage under an unbalanced voltage condition. Issue 5 (5th August 2019)

• Record Type: Journal Article
• Authors: Lin, Xiaodong; Lei, Yong; Fu, Weizhen; Zhu, Yingwei; Zhou, Qun
• Is Part Of: IET renewable power generation. Volume 14:Issue 5(2020)
• Page Start: 734
• Page End: 746
• Publication Date: 2019-08-05
• Subjects: superconducting magnet energy storage -- harmonic distortion -- reactive power control -- HVDC power convertors -- voltage control -- power supply quality -- power system control -- power grids -- voltage‐source convertors; scalable superconducting magnetic energy storage -- unbalanced voltage condition -- modular multilevel converters -- high‐power density -- renewable energy generation -- unbalanced voltage applications -- negative‐sequence mathematical models -- port‐controlled Hamiltonian -- 3P4W MMC‐SMES system -- zero‐sequence current -- multiobjective passivity‐based control strategy -- power quality -- system robustness -- reactive power fluctuations -- double‐frequency active power fluctuation -- dissipation model -- positive‐sequence mathematical models -- coordinated‐control strategy -- three‐phase four‐wire MMC‐based SMES system -- negative‐sequence current -- Matlab‐Simulink -- small‐harmonic distortion; Renewable energy sources -- Periodicals; 333.79405
• DOI: 10.1049/iet-rpg.2019.0111
• Languages: English
• ISSNs: 1752-1416

Abstract

Abstract : Modular multilevel converters (MMCs) have the advantages of high‐power density and small‐harmonic distortion because of their modularity and flexibility, thus providing a new avenue for research into scalable superconducting magnetic energy storage (SMES) in renewable energy generation. This study presents coordinated control for a three‐phase four‐wire (3P4W) MMC‐based SMES system under unbalanced voltage applications. First, the positive‐ and negative‐sequence mathematical models and the port‐controlled Hamiltonian with dissipation model of the 3P4W MMC‐SMES system are established by introducing an additional path for zero‐sequence current. Second, a multi‐objective passivity‐based control strategy that can effectively improve the power quality and system robustness and eliminate both double‐frequency active and reactive power fluctuations or double‐frequency active power fluctuation and negative‐sequence current is proposed. The simulation results based on MATLAB/Simulink demonstrate the effectiveness of the proposed topology of the SMES and its control strategy.