Abstract:
Modular multilevel converter (MMC) is popular in high-power applications due to its attractive features. ACPS may use the full bridge-based MMC with three-phase to single-phase direct AC/AC conversion. This paper proposes modulated model predictive control (MMPC) methods for MMC-ACPS to improve steady-state multi-objective current tracking.
The modulated vectors sequence first combines and represents upper and lower arm output voltage levels as vectors in the current increments plane. Predictive tracking errors of input and circulating current divide the plane into eight sectors. After determining sectors, a modulated vector sequence with one zero vector and two active vectors is chosen to eliminate these current tracking errors simultaneously at the end of each control period.
Duty cycles of the three selected vectors are calculated using multiple current tracking errors minimization. The proposed MMPC illustrates optimized vector selection methods. The proposed methods use only the adjacent nine vectors, reducing the calculation amount and output voltage dv/dt. Experiments confirm the proposed control methods’ steady-state and dynamic performance.
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