Voltage Stability Index for Distribution Network connected in Loop Configuration

ABSTRACT

In power distribution networks, voltage instability can lead to voltage collapse and thus power blackout. A considerable amount of research has been carried out on voltage stability analysis of transmission and radial distribution networks. However, voltage stability analysis considering loop nature of distribution network is largely unaddressed. In this paper, a simplistic analytical approach is proposed, based on circuit analysis and famous biquadratic method to evaluate voltage stability of loop distribution networks in terms of voltage stability index (VSI). This work derives mathematical expressions for VSI of loop configuration for two realistic cases. The performance of proposed VSI is initially evaluated for Korean Electric Power Corporation distribution network. Benchmark analysis has been conducted on IEEE 69 bus test distribution networks to demonstrate the validity of the proposed approach in comparison with relevant works. The proposed approach is also applied for distributed generation placement and faults identification analysis. The results demonstrate the performance improvement in VSI of loop-based distribution networks which are expected to be useful for practical applications of future smart grids.

KEYWORDS:

• Distribution network
• Distributed generation
• Loop configuration
• Smart grid
• Voltage stability index

ACKNOWLEDGEMENTS

This work was supported by Institute for Information & Communications Technology Promotion (IITP) grant funded by the Korea government (MSIP) ([No.R0113-15-0002], Automotive ICT based e-Call standardization, and after-market device development).

DISCLOSURE STATEMENT

No potential conflict of interest was reported by the authors.

Additional information

Notes on contributors

Syed Ali Abbas Kazmi

Syed A. A. Kazmi is presently PhD candidate in College of Information and Communication Engineering at Sungkyunkwan University, South Korea. His research interests include voltage stability, distributed generation, smart grids, and power system modelling.

E-mail: [email protected]

Muhammad K. Shahzaad

Muhammad K. Shahzad is currently post doctorate candidate in College of Information and Communication Engineering at SungKyunKwan University, South Korea. His research interests include sensor and IP networks and graph theory.

E-mail: [email protected]

Dong Ryeol Shin

Dong R. Shin* is presently a professor in College of Information and Communication Engineering at SungKyunKwan University, South Korea. His research interests include future networks research and smart grids.

E-mail: [email protected]