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Analysis of limit induced bifurcations and parameter uncertainties in the context of voltage stability

Grant number: 17/22397-0
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): March 01, 2018
Effective date (End): December 31, 2018
Field of knowledge:Engineering - Electrical Engineering - Power Systems
Principal researcher:Luís Fernando Costa Alberto
Grantee:Lucas Sales Neves
Home Institution: Escola de Engenharia de São Carlos (EESC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
Associated research grant:14/50851-0 - INCT 2014: National Institute of Science and Technology for Cooperative Autonomous Systems Applied in Security and Environment, AP.TEM


With the continuous growth of load, Electric Power Systems (EPS) began to operate closer to its limits. Consequently, the importance of implementing dynamic safety assessment tools in the real-time operating environment has increased. In the context of safety assessments, we have the problem of voltage stability assessments by the characterization of the Load Margin (LM), which relates the current operating point and the Maximum Loading Point (MLP) of the system, limit at which voltage collapse will occur. For the calculation of the LM, several robust methods can be found in the literature for the case where the MLP is represented by a Saddle-Node Bifurcation (SNB), but the calculation of this margin in case of occurrence of a Limit Induced Bifurcation (LIB) is still subject to improvement. This bifurcation, as its name implies, occurs when the system reaches the operational limit of some equipment of the net. Also in this context of voltage stability, the high growth of intermittent sources of energy in electrical systems (photovoltaic sources and wind sources, for example) contribute to the growth of uncertainties with respect to its power balance and its point of operation. Of course, it is desirable that these uncertainties are, even if simplified, considered in the LM calculation of electrical systems with large penetration of intermittent sources. The objective of this research project is the study and the proposal of fast methods of LM evaluation, taking into account limits derived from both saddle-node and limit induced bifurcations of systems with high penetration of intermittent generation. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
NEVES, LUCAS SALES; COSTA ALBERTO, LUIS FERNANDO. On The Computation of The Locally Closest Bifurcation Point Considering Loading Uncertainties and Reactive Power Limits. IEEE Transactions on Power Systems, v. 35, n. 5, p. 3885-3894, SEPT 2020. Web of Science Citations: 0.
NEVES, LUCAS SALES; COSTA ALBERTO, LUIS FERNANDO; CHIANG, HSIAO-DONG. A fast method for detecting limit-induced bifurcation in electric power systems. Electric Power Systems Research, v. 180, MAR 2020. Web of Science Citations: 0.

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