Experimental analysis of stability and power limitations

Evans, R. D.; Bergvall, R. C.

doi:10.1109/jaiee.1924.6535977

Cited by 3 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…OWER system stability has been a topic of major concern for almost one hundred years [1], [2]. Ever since then, a number of forms of instability have come forth as a consequence of the growth of power networks.…”

Section: Introductionmentioning

confidence: 99%

Assessment of power swings in hydropower plants through high-order modelling and eigenanalysis

Silva

Nicolet²,

Grillot

et al. 2016

2016 XXII International Conference on Electrical Machines (ICEM)

View full text Add to dashboard Cite

-Power plants are subject to introduce disturbances in the power grid, resulting from interactions with the dynamical behavior of the energy source subsystem. In the case of hydropower plants when used to compensate for variations of power generation and consumption, instabilities or undesirable disturbances may arise. They may be caused by phenomena such as part load vortex rope pulsations in the draft tube of Francis turbines. This may affect the dynamical behavior of the power plant and lead to troublesome interactions with the grid. This paper presents a case study of an existing hydropower plant that illustrates the effects of pressure pulsations due to vortex rope precession on the draft tube of Francis turbines. It also showcases possible solutions to the mitigation of the effects of this disturbing hydraulic phenomenon over the operation of the generators and electrical system. The investigated system is a 1 GW hydropower plant (4 × 250 MW units). The assessment of the power swings is performed through modal analysis combined with frequencydomain and time-domain simulations, which are then compared with on-site measurements.

show abstract

Section: Introductionmentioning

confidence: 99%

Assessment of power swings in hydropower plants through high-order modelling and eigenanalysis

Silva

Nicolet²,

Grillot

et al. 2016

2016 XXII International Conference on Electrical Machines (ICEM)

View full text Add to dashboard Cite

show abstract

Global performance metrics for synchronization of heterogeneously rated power systems: The role of machine models and inertia

Paganini

Mallada

2017

2017 55th Annual Allerton Conference on Communication, Control, and Computing (Allerton)

View full text Add to dashboard Cite

A recent trend in control of power systems has sought to quantify the synchronization dynamics in terms of a global performance metric, compute it under very simplified assumptions, and use it to gain insight on the role of system parameters, in particular, inertia. In this paper, we wish to extend this approach to more realistic scenarios, by incorporating the heterogeneity of machine ratings, more complete machine models, and also to more closely map it to classical power engineering notions such as Nadir, Rate of Change of Frequency (RoCoF), and inter-area oscillations.We consider the system response to a step change in power excitation, and define the system frequency as a weighted average of generator frequencies (with weights proportional to each machine's rating); we characterize Nadir and RoCoF by the L∞ norm of the system frequency and its derivative, respectively, and inter-areas oscillations by the L2 norm of the error of the vector of bus frequencies w.r.t. the system frequency.For machine models where the dynamic parameters (inertia, damping, etc.) are proportional to rating, we analytically compute these norms and use them to show that the role of inertia is more nuanced than in the conventional wisdom. With the classical swing dynamics, inertia constant plays a secondary role in performance. It is only when the turbine dynamics are introduced that the benefits of inertia become more prominent.

show abstract

Investigations on transmission system performance analysis with voltage variation

Kumar

Singh

2014

2014 Australasian Universities Power Engineering Conference (AUPEC)

View full text Add to dashboard Cite

Usually, the transmission line models, assume sendingand receiving-end voltages as constant, practically, which becomes difficult to maintain, due to its stochastic nature. Thus, for reliable and secure operation of the power system, their performance analysis becomes important. Availability of timesynchronized voltage measurements, at both ends of the transmission lines, allows their more accurate performance analysis. This paper utilizes circle diagrams, derived from ABCD parameter, as a graphical technique for analyzing the power flow variation, i.e., active, reactive, and apparent power at different voltage levels, at sending-and receiving-ends, both, of the transmission lines. Further, indices are proposed to evaluate the power flow variation with voltage. Also, resorting a third dimension of voltage to the circle diagrams, another useful representation of the power-chart transformation as projective relation is proposed. This method, being graphical, offers advantages of ease in analyzing the power flow on transmission lines to the operator, determining the power flow limits, etc. Also, from the smart grids perspective, these relationships help in maintaining secure power flow in the transmission network.

show abstract

Experimental analysis of stability and power limitations

Cited by 3 publications

References 0 publications

Assessment of power swings in hydropower plants through high-order modelling and eigenanalysis

Assessment of power swings in hydropower plants through high-order modelling and eigenanalysis

Global performance metrics for synchronization of heterogeneously rated power systems: The role of machine models and inertia

Investigations on transmission system performance analysis with voltage variation

Contact Info

Product

Resources

About