Abstract
In this paper, a new power control strategy based on a model predictive power control for the grid-tie three-level neutral point clamped inverter is presented. A dynamical model based on the orientation of grid voltage is used to predict the performance of control variables required for the system. A cost function that includes the tracking power ability, the neutral-point voltage balancing and switching frequency reduction is used to achieve the optimal switching state. A proposed selection scheme of control input is introduced to comprehend the stability of the closed-loop system and reduce the computational cost. At each sampling time, only candidate switching state inputs that guarantee the stability condition through a control Lyapunov function is evaluated in the cost function of the MPC algorithm. Thus, the execution time is remarkably decreased by 26% in comparison with traditional model predictive control. Moreover, the dead-time effect is compensated by incorporating its influence in the proposed prediction model. Simulation and experimental results compared with the traditional model predictive control are used to confirm the effectiveness of the proposed scheme.
Highlights
Multilevel inverters have been extensively applied to high power electronics due to their benefits in the increment of the capacity and in the improvement of the performance
Three-level neutral point-clamped (3L-NPC) inverters become attractive as an alternative solution thanks to their advantageous features such as low total harmonic distortion (THD) of the output current and commonmode voltage [1], [2]
This paper described the advantages of a power control scheme based on model predictive control for a grid-tie 3L-NPC inverter
Summary
Multilevel inverters have been extensively applied to high power electronics due to their benefits in the increment of the capacity and in the improvement of the performance. Grid-tie inverters have an important role in applications such as flexible alternating current transmission systems, and renewable energy systems [6], especially the photovoltaic power system [7]. For this reason, stable and adequate control is necessary for grid-connected inverters. The component of the grid current and DC voltage are regulated by the inner and outer control loops, respectively. This method allows to control the current components and the active/reactive powers independently of each other. The high-performance control requires precise parameters for the PI current controllers
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