Steady‐state power operation region of a modular multilevel converter connecting to an AC grid

The modular multilevel converter (MMC) has become a widely used topology for voltage source converter–based high‐voltage direct current transmission projects. To calculate the power operation region of an MMC directly and efficiently, we propose a novel steady‐state phasor model of the MMC. The mode...

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Bibliographic Details
Published inHigh voltage Vol. 6; no. 6; pp. 1009 - 1023
Main Authors Wang, Jiecong, Liu, Chongru, Annakkage, Udaya D., Li, Xiao, Su, Chenbo
Format Journal Article
LanguageEnglish
Published Beijing John Wiley & Sons, Inc 01.12.2021
Wiley
Subjects
Alternating current
Coordinate transformations
Direct current
electric current control
Electricity distribution
HVDC power convertors
HVDC power transmission
Methods
Parameters
Phasors
power grids
Simulation models
Topology
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Summary:The modular multilevel converter (MMC) has become a widely used topology for voltage source converter–based high‐voltage direct current transmission projects. To calculate the power operation region of an MMC directly and efficiently, we propose a novel steady‐state phasor model of the MMC. The model is expressed as an equivalent capacitance in series with a voltage source, where parameters are independent of alternating current (AC) electrical quantity. Based on the model, we propose an open‐loop approach to determine the operation region boundary of MMC by calculating the envelopes of the P–Q curves. The effect of MMC parameters, the circulating current control, and the short‐circuit ratio of the AC grid to the power operation region can be determined by the size and position of the power operation region. The proposed approach and analysis results were verified by an MMC/AC simulation model built in PSCAD/EMTDC.
Bibliography:Associate Editor: Zhichang Yuan
ISSN:2397-7264
2397-7264
DOI:10.1049/hve2.12100