Photovoltaic Energy Conversion Systems with Sliding Mode Control

Abstract

A new sliding-mode-control-based power conversion scheme is proposed for photovoltaic energy conversion systems. The perturbation and observation (P&O) maximum power-point tracking (MPPT) approach is adopted for optimizing the power generation capabilities from solar panels. Due to the inherent nonlinear dynamics of power converters, we need to adopt a nonlinear control approach to optimize the energy conversion efficiency and tolerate the fluctuations and changes of load and sunlight irradiance. In this manuscript, novel first-and higher-order sliding mode control approaches are proposed, aiming to provide a systematic approach for the robust and optimal control of solar energy conversion, which guarantees Lyapunov stability and consistent performance in the face of external perturbations and disturbances. Moreover, to eliminate the chattering phenomenon inherent in the first-order approach, super-twisting second-order sliding mode control is developed for the buck-boost converter. Furthermore, the output of DC–DC converter supplies a voltage-oriented-control (VOC)-based space-vector pulse-width-modulated inverter to generate three-phase AC power to the grid. To demonstrate the robustness and effectiveness of the proposed scheme, computer simulations and dSPACE hardware-in-the-loop platform have been carried on for examining the proposed sliding-mode-control-based solar energy conversion system.

Model Development of a Hybrid Battery–Piezoelectric Fiber System Based on a New Control Method

“…(3) Energy storage criterion: This criterion is defined by function (10) and indicates how successful the control system has been in energy storage. Obviously, the higher the value of the function (29), the more successful the system is in storing energy.…”

“…In [27], a battery-supercapacitor system was set up using PI-PSO hybrid control. However, the most powerful and widely used control theory for hybrid systems, including batteries, is sliding mode control [28,29]. Studies have shown that the sliding mode method has been very successful in controlling these systems and, therefore, this method was used in this study.…”

Adaptive Sliding-Mode Control for Electric Spring in Microgrids with Distributed Renewable Energy

“…The SMC responds rapidly and is not affected by system parameter perturbations, external disturbances, etc. [25][26][27]. Given that the variable structure characteristics of sliding-mode control are similar to the switching characteristics of ES converters, we apply it to the control of ESs.…”

Maximum Power Point Tracking Techniques for Photovoltaic Panel: A Review and Experimental Applications

“…Since a PV setup has a low efficiency, the MPPT is an essential step because it helps the system to achieve the best overall performance [28]. This can be generated through a designed control technique that can be embedded in a DC-DC converter [29].…”

“…The control signal of a SMC is composed of an equivalent u eq and a switching term u sw , which are established in Equation (9). The first mentioned is achieved based on the condition Ṡ = 0 [28]; the switching, which guarantees robustness, is expressed in Equation (10). u = u eq + u sw (9)…”