An Improved Impedance/Admittance Analysis Method Considering Collector Subsystem Transformation in Converter-Integrated Power Systems

To analyze oscillation phenomenon caused by the interaction between converters and an AC grid, the impedance/admittance analysis method is a popular solution, in which each electrical component is represented by an external impedance/admittance matrix and a lumped matrix is formed for stability anal...

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Bibliographic Details
Published in:IEEE transactions on power systems Vol. 36; no. 6; pp. 5963 - 5966
Main Authors: Wang, Chenxuan, Wang, Zhen, Wu, Qiuwei, Xin, Huanhai
Format: Journal Article
Language:English
Published: New York IEEE 01.11.2021
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Admittance
Algorithms
collector subsystem transformation
Converter-integrated power system
Converters
Electric components
Electrical impedance
Impedance
lumped impedance/admittance matrix (LIM/LAM)
Network reduction
Network topology
oscillation analysis
Power system stability
Stability analysis
Subsystems
Topology
Wind power
ISSN:0885-8950, 1558-0679
Online Access:Get full text
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Summary:To analyze oscillation phenomenon caused by the interaction between converters and an AC grid, the impedance/admittance analysis method is a popular solution, in which each electrical component is represented by an external impedance/admittance matrix and a lumped matrix is formed for stability analysis. However, for converter-integrated power systems considering typical collector subsystems (e.g., the radial and the ring collector subsystems in wind farms and PV stations), the impedance network reduction to form the lumped impedance/admittance matrix (LIM/LAM) becomes complicated particularly for a ring collector subsystem, which affects the efficiency of the oscillation analysis. To address this problem, this paper proposes a method that can transform a typical topology of collector subsystems into a pure-parallel topology so that lumped admittance matrix is much easier to be derived. Algorithm complexity analysis confirms its computational advantages. A fifty-converter system is used to verify the effectiveness of the proposed method.
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ISSN:0885-8950
1558-0679
DOI:10.1109/TPWRS.2021.3107715