Online Maximum Loadability Monitoring Scheme for Smart Grid

Heng-Yi Su¹, Yi-Chung Chen², Jia-Chuan Lin³

¹Department of Electrical Engineering, Feng Chia University (FCU), Taichung, Taiwan,China.
²Department of Information Engineering and Computer Science, Feng Chia University (FCU), Taichung, Taiwan,China.
³Department of Automatic Control Engineering, Feng Chia University (FCU), Taichung, Taiwan,,China.

DOI: 10.4236/jpee.2015.34024                

Abstract

This paper presents an algorithm based on Thevenin equivalent network for voltage stability evaluation. The proposed algorithm provides a technique for online predicting the largest possible margin to voltage collapse of an electrical power system. An online maximum loadability determination algorithm is developed by transforming the impedance margin, obtained from the Thevenin equivalent network, into the loading margin at each of the load buses in a power system. Furthermore, the proposed algorithm also takes system load trends into account for practical applications. The effectiveness of the proposed algorithm is tested on the IEEE 14 and 57 bus test systems. Simulation results have shown that the proposed algorithm is useful and practical for online voltage instability monitoring.

Keywords

Maximum Lodability, Online Monitoring, Smart Grid, Thevenin Equivalent, Voltage Stability

Conflicts of Interest

The authors declare no conflicts of interest.

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