Abstract
Employing both high bandwidth (HBW) controller and wide bandgap (WBG) devices in the structure of converters improve the system size, performance, and efficiency. In this paper, HBW model predictive controllers (MPCs) are proposed, with both fixed and unfixed switching frequencies, to control a single-phase five-level hybrid active neutral-point-clamped (ANPC) inverter. A hybrid modulation technique is considered in this paper, in which some of the switches are modulating with high frequency. Therefore, Silicon-Carbide (SiC) MOSFETs are employed in the converter structure to increase the switching frequency and consequently reduce the filter size and increase converter power density. To have the functionality of multilevel output voltage, some restrictions are defined in the adopted MPC with unfixed switching frequency. In the MPC with the constant switching frequency, predefined switching sequences are employed for all sectors. Moreover, to control the neutral point (NP) voltage, the applied times of both small voltage vectors are sets through a cost function. Finally, the simulation and experimental results prove the ability of both proposed methods to control the voltages of the load and NP.
Highlights
With increasing the penetration of renewable energy and energy storage systems, the demand for power converters as a key role is rising [1]–[3]
Employing recent emerging of wide bandgap (WBG) switches such as SiC MOSFETs can improve the efficiency and reduce the converter size
This paper investigates the utilization of high bandwidth (HBW) control system for a single-phase 5-level hybrid SiC/Si active neutral-point-clamped (ANPC) topology with high switching frequency
Summary
With increasing the penetration of renewable energy and energy storage systems, the demand for power converters as a key role is rising [1]–[3]. One of the derived topologies from NPC structure is a 5-level singlephase hybrid active NPC converter [6], in which just eight switches are utilized This structure presents the ability of hybrid switching frequency to improve the efficiency of the converter. The system can be operated with higher bandwidth and faster performance [29] This FCS-MPC strategy employs only one output vector of the converter in every control period. This paper investigates the utilization of HBW control system for a single-phase 5-level hybrid SiC/Si ANPC topology with high switching frequency. 2) Developing unfixed switching frequency MPC (adopted MPC) considering the converter restrictions and switching states to achieve an improved output voltage waveform. 3) Proposing a modified MPC with constant switching frequency based on the SVPWM idea for the considered structure to obtain staircase output voltage.
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