Abstract：This paper introduces an approach to monitoring the stability margin of a distributed power system. Based on the ESAC (Energy Systems Analysis Consortium) criterion, the relationship between the output impedance of the source subsystem and the input impedance of the load subsystem is derived as the distributed power system has an unfavorable stability margin. Then, a small-signal perturbation current is injected into the DC bus. The stability margin monitoring based on the ESAC criterion can be completed by measuring the source-side and load-side response current, and a practical monitoring circuit implemented is proposed. Finally, the feasibility and superiority of the monitoring approach is confirmed by utilizing it in a distributed power system consisting of two buck converters.
杨晓平, 张浩, 马西奎. 基于ESAC标准的分布式电源系统稳定裕度监控[J]. 电工技术学报, 2009, 24(8): 14-21.
Yang Xiaoping, Zhang Hao, Ma Xikui. Stability Margin Monitoring for Distributed Power Systems Based on ESAC Criterion. Transactions of China Electrotechnical Society, 2009, 24(8): 14-21.
[1] 朱成花, 石健将, 严仰光. 直/直变换器输入滤波器的设计[J]. 电工技术学报, 2004, 19(1): 85-94. [2] Dranga O, Chu G, Tse C K, et al. Stability analysis of two-stage PFC power supplies[C]. IEEE Power Electronics Specialists Conference, Jeju, South Korea, 2006: 594-598. [3] Feng X, Ye Z, Le F C, et al. PEBB system stability margin monitoring[J]. Journal of Vibration and Control, 2002, 8(2): 261-276. [4] Middlebrook R D. Input filter consideration in design and application of switching regulators[C]. IEEE Ind. Applicat. Soc. Annu. Metting, Chicago, lllionios, 1976: 366-382. [5] Wildrick C M, Lee F C. A method of defining the load impedance specification for a stable distributed power system[J]. IEEE Trans. on Power Electron., 1995, 10(3): 280-285. [6] Feng X, Liu J J, Lee F C. Impedance specifications for stable DC distributed power systems[J]. IEEE Trans. on Power Electron., 2002, 17(2): 157-162. [7] 朱成花, 严仰光. 一种改进的阻抗比判据[J]. 南京航空航天大学学报, 2006, 38(3): 315-320. [8] Carrol J. An input impedance stability criterion allowing more flexibility for multiple loads which are independently designed[C]. Naval Air Warfare Center, Aircraft Division, Indianapolis, 1992. [9] Sudhoff S D, Glover S F, Lamm P T, et al. Admittance space stability analysis of power electronic systems[J]. IEEE Trsns. on Aerosp. Electron. Syst., 2000, 36(3): 965-973. [10] Liu J J, Feng X, Lee F C, et al. Stability margin monitoring for DC distributed power systems via perturbation approaches[J]. IEEE Trans. on Power Electron, 2003, 18(6): 1254-1261. [11] Sudhoff S D, Glover S F. Three-dimensional stability analysis of DC power electronics based systems[C]. IEEE Power Electronics Specialists Conference, Galway, Ireland, 2000: 101-106.
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