Small Signal Stability Analysis of AC/DC Hybrid Microgrid Under Isolated Island Operation

doi:10.3969/j.issn.1000－7229.2017.01.013

Abstract

Abstract: Compared with pure AC microgrid, AC/DC hybrid microgrid has many advantages, which has become a hot topic. When AC/DC hybrid micro-grid is disconnected with power grid and under isolated island operation, because that each distribution generation (DG) is power electronic interface, the system inertia is small; and the AC side and the DC side are coupled to each other through the main converter, the unstable side is bound to affect the other side, so the small signal stability problem becomes more complex. This paper establishes the model for AC/DC hybrid microgrid which including DG, energy storage, load and main converter, then finds out the systems main oscillation mode and its damping ratio, corresponding state variables through eigenvalue analysis. The proposed method can change the parameters of a particular element to improve the damping ratio in low damping oscillation mode by root locus analysis. Whats more, it effectively improves the stability of the system, and the small-signal analysis results are verified through time-domain simulation.

Key words: AC/DC hybrid microgrid, small signal stability, eigenvalue analysis

CLC Number:

TM 732

XIANG Yang, FU Ming, ZHANG Aifang, DOU Xiaobo,JIAO Yang, YANG Yeqing. Small Signal Stability Analysis of AC/DC Hybrid Microgrid Under Isolated Island Operation[J]. Electric Power Construction, 2017, 38(1): 96-.

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