New online voltage stability margins and risk assessment for multi-bus smart power grids

Abstract

This paper presents a quantitative framework for assessment of voltage stability in smart power networks. First, new stability indices similar to gain and phase margins in linear time invariant control systems are introduced. These indices can be computed online in conjunction with load-flow calculations. Then, a novel risk assessment framework incorporating the new stability indices is developed to methodologically quantify the voltage stability risks a power system faces at any given operating condition. In contrast to existing local stability indices and qualitative risk approaches, the indices and framework introduced provide analytical and quantitative evaluation of voltage stability and associated risks. The results are illustrated with a numerical example.

Keywords:

• voltage stability
• bifurcation point
• voltage collapse
• risk
• stability indices

Acknowledgements

Authors would like to acknowledge the support of Australian Research Council (ARC) Discovery Project [DP140102180].

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by the Australian Research Council (ARC) through discovery project [grant number DP140102180].