Static security assessment according to N-1 criterion for transmission lines based on sampled-blind-number
Static security assessment according to N-1 criterion for transmission lines based on sampled-blind-number
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- Author(s): Y. Liu 1 ; Y. Lei 1 ; S. Peng 1 ; Z. Zhang 1 ; S. Zhang 2
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View affiliations
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Affiliations:
1:
State Grid Shaanxi Electric Power Research Institute , Xi’an, Shaanxi , China ;
2: State Grid Xi’an Electric Power Supply Company , Xi’an, Shaanxi , China
Source:
The 16th IET International Conference on AC and DC Power Transmission (ACDC 2020),
2021
p.
1391 – 1395
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Affiliations:
1:
State Grid Shaanxi Electric Power Research Institute , Xi’an, Shaanxi , China ;
- Conference: The 16th IET International Conference on AC and DC Power Transmission (ACDC 2020)
- DOI: 10.1049/icp.2020.0237
- ISBN: 978-1-83953-330-3
- Location: Online Conference
- Conference date: 02-03 July 2020
- Format: PDF
To consider the uncertainty of loads and output power of new energy generators, a Sampled-Blind-Number (SBN) based static security assessment for transmission lines is put forward to ensure the safe and stable operation of power grid. A SBN space generation method considering the correlation coefficients between random variables is proposed to consider the strong correlativity among loads and new energy outputs. The way of sampling is described for static security assessment, in which, the SBN of a load and a new energy generator output are obtained according to the annual load duration curve and the annual output power duration curve, respectively. The scenes for analysis are obtained by combining the corresponding SBNs, respectively. The loads of the circuits and transformers in the case of N-1 are used as the output SBN, which is compared with its rated value to obtain the N-1 checking result. The probability and the degree of being against the N-1 criterion are obtained for the situation with the risk of static security. An example is given to explain the proposed approach showing its feasibility.
Inspec keywords: probability; power transmission lines; power grids; power transformers; power system stability; power system security
Subjects: Transformers and reactors; Other topics in statistics; Power transmission lines and cables; Power system control