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On-line measurement on stability margin of DC distributed power system

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2 Author(s)
Xiaogang Feng ; Center for Power Electron. Syst., Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA ; Lee, F.C.

In a DC distributed power system, the system level small-signal stability is determined by the minor loop gain, which is an impedance ratio Zo/Zi between source and load power modules. This paper proposes a practical approach to measure the stability margin of the minor loop gain Zo/Zi online. By injecting small-signal external perturbation current iˆp into the DC bus and measuring the magnitude of the load side response current iˆL, the system stability margin can be figured out. Due to its simplicity in principle and implementation, this proposed measurement is useful for both stability analysis in system design and stability monitor in system operation

Published in:

Applied Power Electronics Conference and Exposition, 2000. APEC 2000. Fifteenth Annual IEEE  (Volume:2 )

Date of Conference:

2000