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Electronics 2019, 8(1), 49; https://doi.org/10.3390/electronics8010049

Operational Reliability Assessment of an Interconnected Power System Based on an Online Updating External Network Equivalent Model with Boundary PMU

1
School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, China
2
Electric Power Research Institute, State Grid Shanghai Municipal Electric Power Company, Shanghai 200437, China
*
Author to whom correspondence should be addressed.
Received: 5 December 2018 / Revised: 21 December 2018 / Accepted: 26 December 2018 / Published: 2 January 2019
(This article belongs to the Special Issue Beyond Smart Grid: Power Quality, Reliability and Security Challenges)
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Abstract

Information between interconnected power systems is difficult to share in real time, due to trade secrets and technical limitations. The regional power grid cannot timely detect the impact of changes in the operation mode of the external power grid on the regional reliability, due to faults, load fluctuations, power generation plan adjustments, and other reasons. How to evaluate the reliability of a regional power system under the conditions of information isolation is a difficult problem for the security of interconnected power systems. Aiming at this problem, an operational reliability evaluation method for an interconnected power system is proposed herein, which does not depend on external network information directly, but only uses boundary phasor measurement unit (PMU) measurement data and internal network information. A static equivalent model with sensitivity consistency was used to simplify the external network to ensure the accuracy of the reliability calculation of interconnected power systems. The boundary PMU measurement data were used to update the external network equivalent model online. The algorithm flow of the operation reliability assessment for the interconnected power grid is given. The results of an example based on the IEEE-RTS-96 test system show that the proposed method can track the equivalent parameters of the external network without depending on the actual topological information, and calculate the reliability index of the internal network accurately. View Full-Text
Keywords: interconnected power system; phasor measurement unit; operational reliability assessment; static equivalent model interconnected power system; phasor measurement unit; operational reliability assessment; static equivalent model
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Zhang, D.; Lian, S.; Tao, W.; Liu, J.; Fang, C. Operational Reliability Assessment of an Interconnected Power System Based on an Online Updating External Network Equivalent Model with Boundary PMU. Electronics 2019, 8, 49.

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