Low Computational Burden Predictive Direct Power Control of Quasi Z-Source Inverter for Grid-Tied PV Applications

Abstract

This paper proposes a simplified predictive direct power control for the grid-tied quasi Z-source inverter. The proposed control implements a model predictive control structure to achieve the maximum obtainable power from the collected PV source. The power delivered to the grid is managed to compensate for the reactive power and, as needed, to ensure the grid’s stability. A predictive power model for a quasi Z-source inverter is developed in which the proposed control can operate with a fixed switching frequency without a weighting factor. The simplified space vector modulation uses the three appropriate switching vectors that are selected and applied using precalculated switching times during each switching period, in which the required switching vectors are determined only from one sector in the space vector diagram, taking all of the information of the other sectors, which leads to reducing the computational burden. Simulation results and comparative study are used to confirm the proposed control performance for the grid-tied quasi Z-source inverter capable of tracking and generating the maximum power from PV with fast-tracking dynamics, ensuring the ac voltage desired, and better tracking of the active and reactive power reference with the lowest power ripple. The grid current harmonics were tested and conformed to the IEEE-519 standard. Additionally, the proposed simplified PDPC is experimentally validated using the Hardware-in-the-Loop emulator and the C2000TM-microcontroller-LaunchPadXL TMS320F28379D kit, establishing the usability and good result of our proposed control approach in terms of requirements.

Predictive direct power control with phase‐locked loop technique of three‐level neutral point clamped inverter based shunt active power filter for power quality improvement

“…Another PC technique has been proposed in Abid et al, 107 where it has been used in the direct power of a Z‐shaped semi‐grid‐tied inverter. This proposed PC technique is applied to a PV system to achieve maximum power, where the power delivered to the grid is managed to compensate for the power interaction, when needed, to ensure network stability.…”

Optimized Modulation Scheme for Four-Leg Quasi Z-Source Inverter: Reducing Power Loss and Improving Output Quality

“…The optimized 3DSVM for the four-leg multilevel inverter was suggested to decrease complexity and computation time [39], [40]. This was accomplished by utilizing just one prism, representing a defined region or sector within the diagram where the proposed 3DZSVM strategy is applied, in the voltage space vector to compute all the switching sequences for the 3DSVM strategy.…”