Power System Security Improvement by a Linear Approximation Method
Citation
U.N. Asibeluo, T.C. Madueme"Power System Security Improvement by a Linear Approximation Method", International Journal of Engineering Trends and Technology (IJETT), V27(2),74-78 September 2015. ISSN:2231-5381. www.ijettjournal.org. published by seventh sense research group
Abstract
This paper presents a linear approximation method for
calculating risk-based index of low voltage security.
MATLAB source codes using the concept of risk that
considers both the probability of occurrence and the
severity of the contingency were used to analyze the low
voltage security. Sensitivities of voltage with respect to
active power and reactive power, the mean/variance of
the load uncertainty were used to achieve the
Probability distribution. Continuous severity function
was adopted to quantify the severity because it
uniformly quantifies the severity of the contingencies.
The Nigerian 330KV transmission grid was used to
illustrate the proposed method and the risk indices were
evaluated after a contingency was simulated. The
calculated risk indices reflect a quantitative measure of
the system low voltage security levels. They are efficient
means of quickly indentifying and investigating
situations that cause high risk to the system.
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Keywords
Power system security, risk-based index,
severity function.