Abstract
Stability metrics are used to quantify a system’s ability to maintain equilibrium under disturbances. We did not identify the proposition of a stability metric using sensitivity analysis within the literature. This work proposes a system stability metric and its application to an electrical repowering system. The methodology for applying the proposed metric comprises: (i) system parameters sensitivity analysis and spider diagram construction, (ii) determining the array containing the line segments inclination angles of each spider diagram curve, and (iii) stability calculation using the array mean and maximum inclination value of a line segment. After simulating the model built for the electrical repowering system and applying the methodology, we obtain results regarding the sensitivity indices and stability values of system inputs relative to their outputs, considering the original system and with reduced parameters. Using the stability study, it was possible to determine different stability categories for the system parameters, which indicates the need for different analysis levels.
Highlights
We propose to measure the stability of system input parameters relative to its output based on sensitivity analysis, using as reference the spider diagram method, introduced by Eschenbach and McKeague [63]
Considering the angles formed between the line segments that make up each curve in the diagram and horizontal axis, we stipulate a stability metric
We propose a system stability metric
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Stability studies are performed in different science fields. Stability is investigated based on two perspectives: steady state and transient. The former analyzes the capability of a power system to recover synchronism after gradual disturbances such as slow power changes. The latter evaluates the effects of sudden disturbances such as line outage, abrupt application or removal of loads, and fault occurrence [1].
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