A New Control Architecture With Spatial Comb Filter and Spatial Repetitive Controller for Circulating Current Harmonics Elimination in a Droop-Regulated Modular Multilevel Converter for Wind Farm Application

Circulating current control is one of the critical issues in modular multilevel converters (MMCs). When a frequency-droop-regulated MMC is used to integrate an offshore wind farm into an high-voltage dc transmission system, the variation in its operating ac line frequency induces a change in circula...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2019-11, Vol.34 (11), p.10509-10523
Main Authors: Kolluri, Sandeep, Gorla, Naga Brahmendra Yadav, Sapkota, Rajesh, Panda, Sanjib Kumar
Format: Article
Language:English
Subjects:
Adaptive comb filter
circulating current harmonics
Computer simulation
Controllers
Converters
frequency adaptive periodic control
Frequency control
frequency droop control
Harmonic analysis
Harmonics
HVDC transmission
Metal matrix composites
modular multilevel converter
Offshore energy sources
offshore wind farm integration
Resonant frequency
Sampling
spatial comb filter (SCF)
spatial repetitive controller (SRC)
Time-frequency analysis
Wind farms
Wind power
Wind power generation
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Summary:Circulating current control is one of the critical issues in modular multilevel converters (MMCs). When a frequency-droop-regulated MMC is used to integrate an offshore wind farm into an high-voltage dc transmission system, the variation in its operating ac line frequency induces a change in circulating current harmonic frequencies. Hence, the conventional circulating current controllers, such as proportional-resonant or repetitive controller, which are tuned to a specific frequency, fail to alleviate the circulating current harmonics. In this paper, a new control architecture comprising of a spatial comb filter (SCF) and a spatial repetitive controller (SRC) is proposed to effectively attenuate the even-order harmonics in the circulating current independent of the operating ac line frequency of the MMC. The proposed controller incorporates the phase sampling technique to achieve the dynamic change in the sampling frequency, which is the key to strong periodic disturbance rejection capability of the SCF and SRC even under variable frequency operation. A system level simulation model has been developed on PLECS simulation software to demonstrate the performance of the proposed control architecture. In addition, a scaled-down laboratory prototype of a 1-kW, 400-V, five-level single-phase MMC is developed and the experimental results are presented to substantiate the performance of the proposed control scheme.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2019.2897150