Model predictive control of a hybrid stacked multicell converter with voltage balancing and fault tolerance capability

Abstract

Due to the merits of low conduction losses and superior output power quality, a hybrid stacked multicell converter (HSMC) was put forward as a competitive alternative in the medium/low-voltage high-efficiency applications. A nine-level HSMC (9L-HSMC) can be seen as a combination of a five-level SMC (5L-SMC) and two-level half-bridge, and proper modulation and control strategy are essential for the HSMC to obtain the optimal output performance. This work develops a finite control-set model predictive control (MPC) strategy for 9L-HSMC to balance the capacitor voltages and maintain the desired outputs, rendering the absence of the linear regulator and pulse width modulation (PWM) modulator possible. The fault-tolerant operation can also be achieved flexibly when open-circuit faults occur at active bidirectional switches in the 5L-SMC bridge, and the performance is verified by simulations. Finally, experiments under several typical operating conditions are implemented to verify the effectiveness of 9L-HSMC with the developed MPC strategy.

New Control Approach of Multicell Stacked Cell Inverter for Solar Photovoltaic System

“…The power losses of the 5 L-SMC H-bridge inverter, including switching loss and conduction loss, are investigated to assess the effectiveness of the suggested DCSVM control technique. The equivalent on-state resistance and forward voltage drops define conduction losses, whereas the linear approximation of the voltage and current across the kth switch estimates switching losses [27]. The MATLAB/Simulink was used to calculate the power losses.…”

New hybrid multilevel converters: control and fault-tolerant capability

“…Multilevel converters typically feature redundant switching states, offering flexibility for fault-tolerant operation through topology and switching state reconstructions [13], [65]. MPC, known for its effectiveness in multilevel converters, has shown promise in handling faults [63]- [65].…”

“…Multilevel converters typically feature redundant switching states, offering flexibility for fault-tolerant operation through topology and switching state reconstructions [13], [65]. MPC, known for its effectiveness in multilevel converters, has shown promise in handling faults [63]- [65]. However, the application of MPC-based fault-tolerant strategies to novel hybrid multilevel converters like DP-AM, MANNPC, and ISMC converters presents challenges due to the absence of identifiable redundant modules for controller bypassing in case of faults.…”