Simple large-signal model based on gyrator for system level analysis

Wei, Du; Zhang, Yang; Zhang, Junming; Qian, Zhaoming

doi:10.1109/ecce.2011.6063837

Cited by 1 publication

(3 citation statements)

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“…For Buck converter, the constant part of gyrator conductance named k is 1/(V in *R sense ), where R sense is the equivalent current sense resistor [29]. Taking voltages of output capacitor u c (t) and integration capacitor u c1 (t) as state variables and defining u c (t)=x 1 , u c1 (t)=x 2 .…”

Section: Analysis Of Equilibrium Point Stability and Small-signalmentioning

confidence: 99%

“…So, the gyrator model in [29] is also suitable for analyzing other basic converter topologies and their various derivations. Model structure remains the same, only the expression of gyration conductance is various according to different topologies.…”

Section: Estimation Of Region Of Attraction and Large-signal Stamentioning

confidence: 99%

“…Since the current-mode control is wide adopted in DC/DC converters for better performance, this paper mainly focuses on the stability analysis of cascaded system with current-mode controlled source converters. To simplify the analysis, the gyrator based large-signal model for current-mode controlled DC/DC converter proposed in [29] is employed for the source converter, and the load converter is simplified as a CPL. A small-signal stability criterion is obtained based on the stability analysis of equilibrium point by applying Lyapunov linearization method.…”

Section: Introductionmentioning

confidence: 99%

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Stability Criterion for Cascaded System With Constant Power Load

Wei

Zhang

et al. 2013

IEEE Trans. Power Electron.

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228

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With the development of renewable energy, DC distribution power system (DPS) becomes more and more attractive. The stability of whole system is still a big concern though every single converter is well-designed based on the stand alone operation with sufficient stability. Since the cascaded connection of power converters is one of the most dominant connection forms in the DC DPS, the stability analysis of the cascaded system is very important to ensure stability of the whole system. Based on Lyapunov linearization method and Brayton-Moser's mixed potential theory, stability of equilibrium point and an estimation of the region of attraction are investigated for cascaded system in the DC DPS. Based on the analysis, stability prediction criteria for cascaded system under small-signal and large-signal disturbance are obtained. The two criteria is simple and straightforward, which can be unified to get a general stability criterion to predict system's stability under both small-signal and large-signal transient disturbance. The relationship between system parameters and the stability is presented and discussed in the paper. Therefore, instead of trial and error, the proposed criterion can predict and guarantee the stability operation of cascaded system during the design process, and it is also helpful to select matched power converters in system level design. The simulation and experimental results verify the effectiveness of the proposed criterion.

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Section: Analysis Of Equilibrium Point Stability and Small-signalmentioning

confidence: 99%

Section: Estimation Of Region Of Attraction and Large-signal Stamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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