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A Novel Dynamic Index of Voltage Instability Expectation with Power System Contingency

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Abstract

This paper proposes a novel dynamic voltage instability expectation index which takes into account dynamic voltage stability characteristics, the long-term phenomena and probability state of power system contingency. This index is a meter to measure the general robust power system under critical cases which are identified by contingency analysis. The critical contingencies are precisely analyzed by steady-state power load flow in perturbations to figure out violation cases, the weakness of the power system. The probability states of each of violation cases are calculated through availability and unavailability values of devices. The degree of voltage instability is estimated newly by the smallest determinant of dynamic load flow Jacobian matrix in evolution time of power system simulation. The variables of dynamic devices such as under load tap changer of the transformer, excitation limiters of generator unit, affected on a long-term characteristic of the power system, are considered in dynamic load flow Jacobian matrix. Combining the voltage instability rate and the probability state, a novel index, namely voltage instability expectation in dynamic index, is proposed. This index reflects the mutual correlation between the voltage instability rate and probable contingency cases which result in either voltage violation, overload flow, or voltage instability. The new index is demonstrated in IEE 9-bus test system and actual Vietnam power system. It should be a new measure to make a decision of transmission system expansion planning.

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Acknowledgments

The authors gratefully acknowledge the contributions of Dr. Federico Milano for his original program PSAT. This work was supported by the Human Resources Development of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) Grant Funded by the Ministry of Trade, Industry and Energy (No. 20194030202430).

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Authors and Affiliations

  1. Department of Electrical Engineering, Can Tho University, Can Tho, Vietnam

    Duy-Phuong N. Do

  2. Department of Electrical Engineering, Gyeongsang National University, Jinju, Korea

    Ungjin Oh, Yeonchan Lee & Jaeseok Choi

  3. School of Electrical Engineering, Korea University, Seoul, Korea

    Byongjun Lee

Authors
  1. Duy-Phuong N. Do
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  2. Ungjin Oh
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  3. Yeonchan Lee
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  4. Jaeseok Choi
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  5. Byongjun Lee
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Correspondence to Jaeseok Choi.

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Do, DP.N., Oh, U., Lee, Y. et al. A Novel Dynamic Index of Voltage Instability Expectation with Power System Contingency. J. Electr. Eng. Technol. 14, 1463–1472 (2019). https://doi.org/10.1007/s42835-019-00158-1

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  • DOI: https://doi.org/10.1007/s42835-019-00158-1

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