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Abstract：
Modular multilevel converter (MMC) is considered as a promising topology for voltage-source converter (VSC) high-voltage, direct current (HVDC) applications. This paper presents a new control strategy for MMC-HVDC under unbalanced grid conditions. First, a new inner loop current control strategy based on nonideal proportional resonant (PR) controllers in stationary alpha beta frame is designed, which is more concise compared to the existing dual sequence current control scheme. Second, an analytical expression for circulating current is obtained which shows that the circulating currents will be asymmetric under unbalanced grid conditions and can be decomposed into positive-, negative-, and zero-sequence component. In order to suppress all these components, a new circulating current suppressing strategy is analyzed and designed also based on nonideal PR controllers. Application of nonideal PR controllers makes the control system well adapt to the fluctuation of grid frequency. The effectiveness of the proposed control strategy is verified through a simulation case of a 251-level MMC-HVDC transmission system using real-time digital simulator.
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IEEE TRANSACTIONS ON POWER ELECTRONICS
ISSN： 0885-8993
Year： 2015
Issue： 1
Volume： 30
Page： 387-397
4 . 9 5 3
JCR@2015
6 . 1 5 3
JCR@2020
ESI Discipline： ENGINEERING;
ESI HC Threshold：138
JCR Journal Grade：2
CAS Journal Grade：1
Cited Count：
WoS CC Cited Count： 246
SCOPUS Cited Count： 340
ESI Highly Cited Papers on the List： 39 Unfold All
WanFang Cited Count：
Chinese Cited Count：
30 Days PV： 2
