Abstract
Numerical simulations reveal that a single-stage differential boost AC module supplied from a PV module under an Maximum Power Point Tracking (MPPT) control at the input DC port and with current synchronization at the AC grid port might exhibit bifurcation phenomena under some weather conditions leading to subharmonic oscillation at the fast-switching scale. This paper will use discrete-time approach to characterize such behavior and to identify the onset of fast-scale instability. Slope compensation is used in the inner current loop to improve the stability of the system. The compensation slope values needed to guarantee stability for the full range of operating duty cycle and leading to an optimal deadbeat response are determined. The validity of the followed procedures is finally validated by a numerical simulations performed on a detailed circuit-level switched model of the AC module.
Highlights
IntroductionPublisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations
This paper dealt with the nonlinear behavior and slope compensation of a grid-tied boost inverter under a differential peak current mode control for its operation as an AC module in a PV
The paper began with presenting detailed simulations that has shown that the system can exhibit fast-scale instability
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. PV systems based on AC module approach has many advantages over central and string inverter systems and it is foreseen to be the future trend of PV system architectures These advantages include small size, good quality of supplied electrical power, high conversion efficiency, good reliability, robust stability, simple and flexible installation options and enhanced safety. AC modules can cause the power generation system to be subject to faults or unfavorable conditions and the system reliability may be degraded which can negatively impacts the system performance This is because fast-scale instability could increase the ripples of the electrical variables which results in higher overall losses and current stress on the switching devices.
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