Abstract
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 (M3C) 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 dqaxis 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 M3C system implemented in MATLAB /Simulink.
| Original language | English |
|---|---|
| Article number | 7801883 |
| Pages (from-to) | 2111-2121 |
| Number of pages | 11 |
| Journal | IEEE Transactions on Power Delivery |
| Volume | 32 |
| Issue number | 4 |
| DOIs | |
| State | Published - Aug 2017 |
Keywords
- Decoupled control strategy
- Fractional frequency transmission system
- Modular multi-level matrix converter
- Offshore wind power
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