Power System Security Improvement by a Linear Approximation Method

  IJETT-book-cover  International Journal of Engineering Trends and Technology (IJETT)          
© 2015 by IJETT Journal
Volume-27 Number-2
Year of Publication : 2015
Authors : U.N. Asibeluo, T.C. Madueme


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

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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Power system security, risk-based index, severity function.