Study on an improved Normal Form solution and reduced-order mode reconstruction in power system

Wang, Zhouqiang

doi:10.1109/tencon.2015.7372800

Cited by 3 publications

(2 citation statements)

References 9 publications

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“…The test system is IEEE 9-bus power system [41] shown in Figure 1 which has been used in the literature to study modal interaction [36,40]. Two-axis model was used with each machine equipped with a simple exciter.…”

Section: System Descriptionmentioning

confidence: 99%

“…Two challenges however are-(1) a prior knowledge of the significant terms; (2) convenient computational technique to focus on the significant terms. A reduced order NF study was performed in [36] where some interactions were neglected based on their damping rates and nearness to resonance. In order to estimate the NF coefficients relating to these interactions, the time-domain signal is fitted to the needed coefficients in least square (LS) sense, which makes the modal reconstruction fast.…”

Section: Introductionmentioning

confidence: 99%

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Power System Nonlinear Modal Analysis Using Computationally Reduced Normal Form Method

et al. 2020

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Increasing nonlinearity in today’s grid challenges the conventional small-signal (modal) analysis (SSA) tools. For instance, the interactions among modes, which are not captured by SSA, may play significant roles in a stressed power system. Consequently, alternative nonlinear modal analysis tools, notably Normal Form (NF) and Modal Series (MS) methods are being explored. However, they are computation-intensive due to numerous polynomial coefficients required. This paper proposes a fast NF technique for power system modal interaction investigation, which uses characteristics of system modes to carefully select relevant terms to be considered in the analysis. The Coefficients related to these terms are selectively computed and the resulting approximate model is computationally reduced compared to the one in which all the coefficients are computed. This leads to a very rapid nonlinear modal analysis of the power systems. The reduced model is used to study interactions of modes in a two-area power system where the tested scenarios give same results as the full model, with about 70% reduction in computation time.

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Section: System Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%