Switching System's MLE Based Transient Stability Assessment of AC/DC Hybrid System Considering Continuous Commutation Failure

The commutation failure of Line Commutated Converter-High Voltage Direct Current (LCC-HVDC) cannot be avoided. This paper presents a novel transient stability assessment approach for AC/DC hybrid system considering continuous commutation failure. First, the conception and mathematical background of...

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Bibliographic Details
Published in:IEEE transactions on power systems 2021-01, Vol.36 (1), p.757-768
Main Authors: Hu, Jiawei, Wang, Tong, Wang, Zengping, Liu, Jiuliang, Bi, Jingtian
Format: Article
Language:English
Subjects:
AC/DC hybrid system
Commutation
Compensation
Continuous commutation failure
Converters
Direct current
Failure
Hybrid systems
Liapunov exponents
Mathematical analysis
Matrix methods
Maximum likelihood estimation
Maximum lyapunov exponent
Power system stability
Stability analysis
Switches
Switching
Switching compensation matrix
Switching systems
System effectiveness
Transient analysis
Transient stability
Transient stability assessment
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Summary:The commutation failure of Line Commutated Converter-High Voltage Direct Current (LCC-HVDC) cannot be avoided. This paper presents a novel transient stability assessment approach for AC/DC hybrid system considering continuous commutation failure. First, the conception and mathematical background of Maximum Lyapunov Exponent (MLE) of switching system is introduced, and the switching compensation matrix is derived. Next, the switching system model of AC/DC hybrid system considering continuous commutation failure caused by AC faults is established. On the basis of switching compensation, the MLE of switching system is calculated accurately, and the MLE based criteria are proposed to assess the transient stability of the switching system. Finally, the modified 39-bus system with LCC-HVDC added and the real power system are used as test systems to investigate the validity and effectiveness of the proposed transient stability assessment approach.
ISSN:0885-8950
1558-0679
DOI:10.1109/TPWRS.2020.3007651