Control Strategy of MMC-HVDC under Unbalanced Grid Voltage Conditions

Jianpo Zhang; Chengyong Zhao

Control Strategy of MMC-HVDC under Unbalanced Grid Voltage Conditions

Jianpo Zhang

Chengyong Zhao

Vol. 15, No. 6, pp. 1499-1507, Nov. 2015

10.6113/JPE.2015.15.6.1499

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Abstract

High voltage direct current transmission based on modular multilevel converter (MMC-HVDC) is one of the most promising power transmission technologies. In this study, the mathematical characteristics of MMC-HVDC are analyzed in a synchronous rotational reference frame. A hybrid current vector controller based on proportional integer plus resonant is used to uniformly control the DC and double-base frequency AC currents under unbalanced grid voltage conditions. A corresponding voltage dependent current order limiter is then designed to solve the overcurrent problems that may occur. Moreover, the circulating current sequence components are thoroughly examined and controlled using a developed circulating current suppressor. Simulation results verify the correctness and effectiveness of the proposed control schemes.

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Cite this article

[IEEE Style]

J. Zhang and C. Zhao, "Control Strategy of MMC-HVDC under Unbalanced Grid Voltage Conditions," Journal of Power Electronics, vol. 15, no. 6, pp. 1499-1507, 2015. DOI: 10.6113/JPE.2015.15.6.1499.

[ACM Style]

Jianpo Zhang and Chengyong Zhao. 2015. Control Strategy of MMC-HVDC under Unbalanced Grid Voltage Conditions. Journal of Power Electronics, 15, 6, (2015), 1499-1507. DOI: 10.6113/JPE.2015.15.6.1499.