AC Impedance Modeling of True-Bipolar MMC-HVdc System With Dual-Droop Control

Droop control strategy proposed by referring to the output power versus frequency and voltage amplitude curve of the generator is used in the true-bipolar modular multilevel converter (MMC)- high-voltage direct current (HVdc) system. The other side of the true-bipolar MMC-HVdc system is generally co...

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Bibliographic Details
Main Authors: Feng, Bole, Wang, Yue, Li, Pengkun, Zhu, Quanle, Xue, Yinglin, Li, Fengmo, Li, Runtian, Liu, Yi
Format: Conference Proceeding
Language:English
Subjects:
Analytical models
Control systems
Couplings
droop control
Frequency conversion
Frequency coupling
HVDC transmission
Impedance
Mathematical models
Multi-input multi-output system
Sequence Impedance modeling
True-bipolar
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Description
Summary:Droop control strategy proposed by referring to the output power versus frequency and voltage amplitude curve of the generator is used in the true-bipolar modular multilevel converter (MMC)- high-voltage direct current (HVdc) system. The other side of the true-bipolar MMC-HVdc system is generally connected to a large-scale new energy generation field. In this situation, people find that the oscillation problem occurs from time to time. To study systems with a high proportion of power electronics, this article respectively establishes the small-signal multi-input multi-output (MIMO) sequence impedance model of the ac side of a pseudo-bipolar MMC-HVdc system and a true-bipolar MMC-HVdc system considering frequency coupling. Simulation models are established on the MATLAB/Simulink platform to verify the accuracy of the established model.
ISSN:2329-3748
DOI:10.1109/ECCE50734.2022.9947945