电源学报2024，Vol.22Issue(2)：250-262,13.DOI:10.13234/j.issn.2095-2805.2024.2.250
超导磁储能装置提高柔性直流配电系统稳定性的研究
Research on Superconducting Magnetic Energy Storage Device to Improve the Stability of Flexible DC Distribution System
摘要
Abstract
The converter with constant-power control in a flexible DC distribution system has characteristics of constant-power load,which will reduce the system damping and adversely affect the system stability.To address this problem,a superconducting magnetic energy storage(SMES)device is introduced to improve the system stability.A feed-back control model of the flexible DC distribution system is derived,and the effect of constant-power load characteris-tics of the converter on system stability is investigated by frequency-domain analysis.Combined with a mathematical model and frequency-domain analysis,it is also pointed out that the SMES device can improve the system stability by introducing positive damping to grid and increasing the phase margin of the system's open-loop transfer function at the shear frequency.To prevent over-high voltage at both ends of the superconducting magnet,the DC/DC converter which connects the SMES device with the DC distribution network needs to have certain voltage regulation performance.Therefore,the SMES device with a modular multilevel DC/DC converter(DC-MMC)is studied,which can adjust the number of sub-modules flexibly to set the voltage ratio of the converter.Moreover,the DC-MMC can control the voltage at both ends of the superconducting magnet while realizing a bidirectional flow of energy in the converter,thus protect-ing storage device.The feasibility and effectiveness of the SMES device with DC-MMC in improving the stability of flex-ible DC distribution system is verified by time-domain simula-tion waveforms.关键词
柔性直流配电系统/超导磁储能/小信号稳定性/反馈控制模型/模块化多电平DC/DC换流器Key words
Flexible DC distribution system/supercon-ducting magnetic energy storage(SMES)/small signal stabili-ty/feedback control model/modular multilevel DC/DC con-verter(DC-MMC)分类
信息技术与安全科学引用本文复制引用
李岚,丁安敏,田洪英,张彦,张奎同,马文忠..超导磁储能装置提高柔性直流配电系统稳定性的研究[J].电源学报,2024,22(2):250-262,13.基金项目
国家自然科学基金资助项目(51777216) （51777216）
山东省自然科学基金资助项目(ZR2018MEE040,ZR2019MEE094)This work is supported by National Natural Science Foundation of China under the grant 51777216 （ZR2018MEE040,ZR2019MEE094）
Natural Science Founda-tion of Shandong Province under the grant ZR2018MEE040 and ZR2019MEE094 （）
