PROJECT TITLE :
Control of Modular Multilevel Converters under Singular Unbalanced Voltage Conditions with Equal Positive and Negative Sequence Components - 2017
This paper focuses on the management of Modular Multilevel Converters (MMC) for High Voltage DC (HVDC) applications throughout unbalanced AC grid voltage sags where positive and negative sequence voltages are equal. The control theme relies on six arm energy regulators, six independent current controllers, and 2 reference calculation stages that convert the power references into grid and inner current references. Conventional inner AC currents reference calculation fails if the amplitude of the positive and also the negative sequence AC grid voltages are equal, a state which is said in this paper as singular voltage condition. This paper discusses the types of network faults that cause this condition and proposes three completely different solutions to operate the converter in such situations. The adequacy of the proposed solutions is validated through simulations considering every of the problematic fault situations.
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