Abstract
A control strategy for the low frequency (LF) AC transmission based on modular multilevel matrix converter (M <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> C) under single-phase outage condition is presented in this paper. The proposed controller includes inner and outer control loops based on the vector control method. The outer control loop consists of two controllers, controlling the reactive power on the power frequency (PF) side and the voltage of the sub-module (SM) capacitor respectively. The dual current control scheme is applied to the inner control loop, ensuring fast current regulation and the ability to operate under unbalanced grid conditions. Besides, a combination of the optimized capacitor voltage balancing control and the nearest level modulation (NLM) is presented to reduce the capacitor voltage fluctuation and switching losses. Moreover, a supplementary controller is adopted to suppress the current circulation. The simulation in PSCAD/EMTDC reveals that the control scheme provides outstanding steady-state and dynamic performances under both balanced and unbalanced grid conditions.
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