Journal ArticleDOI
Voltage stability: analysis needs, modelling requirement, and modelling adequacy
M.K. Pal
- Vol. 140, Iss: 4, pp 279-286
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TLDR
The importance of representing dynamic loads by valid dynamic models in dynamic analyses of voltage stability is demonstrated in this article, where the authors present an argument in favour of using the theoretically rigorous and well established models for loads with fast dynamic response, when detailed analyses are warranted.Abstract:
The importance of representing dynamic loads by valid dynamic models in dynamic analyses of voltage stability is demonstrated. Several dynamic load models reported in the literature are reviewed. It is shown that, for loads with slow dynamics or when the system voltage may be assumed constant, small signal stability is independent of the load model used, provided the model parameter values are correctly chosen. The same results can also be predicted by steady-state analysis by appropriately modifying the conventional power flow model. In large disturbance situations, and when the load dynamics exhibit fast response characteristics, a detailed system modelling is needed. An argument is presented in favour of using the theoretically rigorous and well established models for loads with fast dynamic response, when detailed analyses are warranted.read more
Citations
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Journal ArticleDOI
Modelling and identification of nonlinear dynamic loads in power systems
D. Karlsson,David J. Hill +1 more
TL;DR: In this article, an approach for experimental determination of aggregate dynamic loads in power systems is described, which can be expressed as nonlinear differential equations or equivalently realised in block diagram form as interconnections of nonlinear functions and linear dynamic blocks.
Journal ArticleDOI
Voltage stability analysis using generic dynamic load models
Wilsun Xu,Y. Mansour +1 more
TL;DR: In this article, the authors investigated the dynamic nature of voltage stability using a generic load model representing the dynamic behaviour of aggregate loads, and revealed the mechanism of voltage collapse by examining the interaction of load dynamics with the supply network.
Journal ArticleDOI
On bifurcations, voltage collapse and load modeling
TL;DR: In this article, the relation between bifurcations and power systems stability through a thorough analysis of several examples, to clarify some ideas regarding the usefulness and limitations of Bifurcation theory in network studies and operation, particularly in voltage stability related issues.
Journal ArticleDOI
Voltage collapse in complex power grids
TL;DR: This work derives a closed-form condition under which a power network is safe from voltage collapse, and extensively test its predictions on large-scale systems, highlighting how the condition can be leveraged to increase grid stability margins.
Journal ArticleDOI
Toward a practical performance index for predicting voltage collapse in electric power systems
Hsiao-Dong Chiang,R. Jean-Jumeau +1 more
TL;DR: In this article, the authors proposed a new performance index that provides a direct relationship between its value and the amount of load demand that the system can withstand before collapse, which can answer questions such as: "can the system withstand another 100 MVar increase on bus 11?"
References
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Book
Power system voltage stability
TL;DR: In this article, a clear, in-depth explanation of voltage stability, covering both transient and longer-term phenomena and presenting proven solutions to instability problems, is presented, along with planning and operating guidelines, computer methods for power flow and dynamic simulation, and descriptions of actual voltage instability incidents.
Journal ArticleDOI
Fast calculation of a voltage stability index
TL;DR: In this article, a fast method to calculate the minimum singular value and the corresponding (left and right) singular vectors is presented, which only requires information available from an ordinary program for power flow calculations.
Journal ArticleDOI
Towards a theory of voltage collapse in electric power systems
Ian Dobson,Hsiao-Dong Chiang +1 more
TL;DR: In this paper, the authors described the loss of stability when a stable equilibrium point disappears in a saddle node bifurcation and presented a simple model of the system dynamics after the bifurecation.
Journal ArticleDOI
Voltage stability conditions considering load characteristics
TL;DR: In this article, it is shown that when the characteristic of the composite load of a typical utility system is taken into account, large disturbance voltage stability is assured by the existence of the stable equilibrium state of the post-disturbance system.