Journal
IEEE TRANSACTIONS ON POWER DELIVERY
Volume 32, Issue 4, Pages 2111-2121Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPWRD.2016.2646384
Keywords
Decoupled control strategy; fractional frequency transmission system; modular multi-level matrix converter; offshore wind power
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Funding
- State Grid Corporation in China [52094016000C]
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Fractional frequency transmission system (FFTS), also known as low-frequency ac transmission system, is a promising solution to offshore wind power integration. The ac/ac converter is the most important equipment in FFTS. The modular multilevel matrix converter ((MC)-C-3) is widely regarded as the next-generation ac/ac converter, but its complex control remains a problem. A novel control strategy is proposed featuring its decoupling algorithm in this paper. Different from previous research, the proposed current control regulates current components of different frequencies separately in star-figure subconverters under their synchronous rotating frames (SRFs), where the current is transformed to dq-axis dc signals for a better performance. A novel algorithm named cross-SRF decoupling algorithm is proposed to overcome the tight coupling between the circulating currents of two different frequencies. The effectiveness of the proposed control strategy has been verified by the simulation results obtained from a 110 kV, 400 MW (MC)-C-3 system implemented in MATLAB/Simulink.
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