Abstract
The high increase of renewable energy sources and the increment of distributed generation in the electrical grid has made them complex and of variable parameters, causing potential stability problems to the PI controllers. In this document, a control strategy for power injection to the electrical system from photovoltaic plants through a voltage source inverter two-level-type (VSI-2L) converter is proposed. The algorithm combines a current-based maximum power point-tracking (Current-Based MPPT) with model predictive control (MPC) strategy, allowing avoidance of the use of PI controllers and lowering of the dependence of high-capacitive value condensers. The sections of this paper describe the parts of the system, control algorithms, and simulated and experimental results that allow observation of the behavior of the proposed strategy.
Highlights
The current dependence on electrical equipment needed for daily tasks, mobile devices and electromobility has generated a global increase in energy demand [1,2]
Motivated by the characteristics of the aforementioned strategies, this paper proposes the usage of power injection to the electrical grid from a solar system using a predictive current-control scheme, with a current-based strategy for maximum power point-tracking (MPPT) and feedback from the solar array current to obtain the reference for the control
The only difference compared to the simulation parameters of the proposed strategy is that a Ts MPPT of 20 [ms] is used
Summary
The current dependence on electrical equipment needed for daily tasks, mobile devices and electromobility has generated a global increase in energy demand [1,2]. Electric power systems have used power from renewable sources for some time, mainly from solar and wind energy plants which use of power converters, which obtain the maximum benefit independent of the environmental conditions [4]. Distributed generation leads to intermittently produced energy by the electrical power systems [7], causing the system parameters to be affected and generates possible divergences in the converter’s control loops. These power converters use PI-based control schemes, which show good performance when the system works near the nominal operating point [8]
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