标题：Multi-hierarchy control strategy in abc coordinate for modular multilevel matrix converter in fractional frequency transmission system
作者：Ou, Zhujian ;Wang, Guangzhu
作者机构：[Ou, Zhujian ] State Grid Nantong Power Supply Company, 1 Yuelong South Road, Nantong, China;[Wang, Guangzhu ] Shandong University, 17923, Jingshi Roa 更多
来源：Journal of Engineering
摘要：This paper proposes a multi-hierarchy control strategy in abc coordinate for modular multilevel matrix converter (M3C) in fractional frequency transmission system (FFTS). The proposed control strategy avoids complicated coordinate transformations when the traditional control strategies based on coordinate transformation are adopted. Four hierarchies are designed to balance the capacitor voltages. In different hierarchies, the capacitor voltage ripples have different frequencies. According to this characteristic, different bandwidths of filters are adopted in different hierarchies, resulting in different control speeds among the four hierarchies. This will not only speed up the control but also assure the control accuracy. Simulation results verify the feasibility and effectiveness of the proposed strategy.
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