Harmonics Compensation by Using a Multi-Modular H-Bridge-Based Multilevel Converter

Abstract

This paper presents an active power filter based on a seven-level cascade H-bridge where the main contribution is a control strategy that combines model-based predictive control, the voltage vectors of the converter output levels, the phase shift PWM technique, and suboptimal DC-link voltage control. The proposed scheme greatly simplified the overall control system, making it well suited to compensate the current harmonics distortion at the grid side, generated by nonlinear loads connected to the point of common coupling. In addition, the proposed method achieved a balancing of the capacitor voltages of the seven-level cascade H-bridge converter by using the minimum DC-link voltage sensors. This feature significantly reduced the control system complexity and provided a low computational burden. Experimental results confirmed the feasibility and effectiveness of the proposed controller.

MPC with Space Vector Phase-Shift PWM (SV-PSPWM) Technique with Harmonic Mitigation Strategy for Shunt Active Power Filters Based on H-Bridge Multilevel Converter

“…Once the optimal voltage level has been selected, the PSPWM is carried out, which consists of three triangular carriers 180 °3 out of phase with each other with the same appliance and the same frequency to obtain the activation times of the trigger signals (Gregor et al, 2021).…”

Model Predictive Control of a Modular 7-Level Converter Based on SiC-MOSFET Devices—An Experimental Assessment

“…Some firing signal combinations are shown in Table 1 for phase "a". The firing signals for phases b and c can be obtained likewise, taking into account the permitted combinations and avoiding short circuits [24,25].…”

Control Strategies Applied to Active Power Filters

“…The Special Issue "Control Strategies Applied to Active Power Filters" includes four papers [4][5][6][7], which each present completely different aspects of active filter control. These four papers are sufficient to cover the main APF control issues that exist in a wide range of applications.…”

“…The second paper [5] is related to the multimodular three-phase active power filter with seven-level cascade H-bridge converter. In this case, the authors are focused on the converter control, which combines the concepts of model-based predictive control, voltage vector phase-shifted pulse width modulation, and dc-link voltage control.…”