The irrelevance of electric power system dynamics for the loading margin to voltage collapse and its sensitivities

Dobson, Ian

doi:10.1587/nolta.2.263

Cited by 35 publications

(30 citation statements)

References 43 publications

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“…Therefore, injecting more reactive powers into the network may shorten the robust stability region relatively. 3) Effect of exciter gain K: The model of exciter is described in (25). In this section, effect of exciter gain K is analyzed in Table IV.…”

Section: A Robust Stable Point Smentioning

confidence: 99%

“…It has been noted in [25] that traditional "voltage collapse" instability is not affected by the load dynamics as it corresponds to saddle-node bifurcation, where the equilibrium point disappears altogether. At the same time for the more common Hopf bifurcation it was argued in [26] that sensitivity analysis of the system trajectories may provide enough information to assess the risks associated with common disturbances.…”

Section: Introductionmentioning

confidence: 99%

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Robust Stability Assessment in the Presence of Load Dynamics Uncertainty

Nguyen

Turitsyn

2016

IEEE Trans. Power Syst.

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Abstract-Dynamic response of loads has a significant effect on system stability and directly determines the stability margin of the operating point. Inherent uncertainty and natural variability of load models make the stability assessment especially difficult and may compromise the security of the system. We propose a novel mathematical "robust stability" criterion for the assessment of small-signal stability of operating points. Whenever the criterion is satisfied for a given operating point, it provides mathematical guarantees that the operating point will be stable with respect to small disturbances for any dynamic response of the loads. The criterion can be naturally used for identification of operating regions secure from the occurrence of Hopf bifurcation. Several possible applications of the criterion are discussed, most importantly the concept of Robust Stability Assessment (RSA) that could be integrated in dynamic security assessment packages and used in contingency screening and other planning and operational studies.

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Section: A Robust Stable Point Smentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Robust Stability Assessment in the Presence of Load Dynamics Uncertainty

Nguyen

Turitsyn

2016

IEEE Trans. Power Syst.

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“…However, analyses based on static approaches present some practical advantages over the dynamical approaches [2]. Analyses based on static approaches have been widely used, since they provide results with acceptable accuracy and little computational effort.…”

Section: Introductionmentioning

confidence: 99%

Robust computation of voltage stability margins for transmission and distribution grids

Xavier

Bedrinana

Castro

2013

2013 IEEE Power &Amp; Energy Society General Meeting

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A practical and fast method for computing power systems' maximum loading point (MLP) using the load flow with step size optimization (LFSSO) technique is presented in this paper. The method is based on successive calculations of operating points in the infeasible region of the parameter space, from a large loading (larger than the actual maximum) down to the actual maximum loading, by using a load shedding technique based on the geometric characteristics of the maximum loading hyperplane.Also, a practical procedure is added to the process by including the system's operator information about the maximum admissible error allowed in the value of MLP. The model was also improved by considering the possibility of calculating the MLP for the whole system or for specific predefined areas. The method was applied to IEEE test systems and actual distribution and transmission systems, as the Brazilian system with more than 4,500 buses. The MLP is obtained after a few iterations, showing that the proposed method is very efficient.Index Terms-Load flow analysis, maximum loading point, voltage stability, step size optimization.

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“…Theoretical studies showed that the small-disturbance stability analysis of power system voltage stability can be based on the power flow (PF) equation [5][6][7][8]. Among them, saddle-node bifurcation (SNB) and limit-induced bifurcation (LIB) associated with the PF equation are two kinds of mechanisms that lead to voltage collapse [3,4,9,10].…”

Section: Introductionmentioning

confidence: 99%

Novel Techniques for Continuation Method to Calculate the Limit-induced Bifurcation of the Power Flow Equation

Guo-yun

Chen

2010

Electric Power Components and Systems

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This article proposes an improved continuation method to calculate the limit-induced bifurcation associated with the power flow equation due to the encounter with reactive power limits by generators. One of the distinguishing features is that the maximum loadability characteristics of limit-induced bifurcation are used for identification so that the computation efforts can be minimized. Another distinctive characteristic of the method is that, to ensure accuracy, the tangent vector of the continuation power flow equation at the reactive power limit encountering point is used to differentiate between limit-induced bifurcation and saddle-node bifurcation, as the latter also represents maximum loadability. The proposed method also adopts the conventional schemes of secant prediction, arc-length correction, and a new stepsize control, i.e., the convergence-dependent step-size control. Numerical results of the IEEE 118-bus system are used to illustrate the improvements of the proposed continuation method in comparison with the existing one.

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The irrelevance of electric power system dynamics for the loading margin to voltage collapse and its sensitivities

Cited by 35 publications

References 43 publications

Robust Stability Assessment in the Presence of Load Dynamics Uncertainty

Robust Stability Assessment in the Presence of Load Dynamics Uncertainty

Robust computation of voltage stability margins for transmission and distribution grids

Novel Techniques for Continuation Method to Calculate the Limit-induced Bifurcation of the Power Flow Equation

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