This paper studies voltage regulation and maximum power point tracking (MPPT) control for a DC-microgrid that includes a photovoltaic (PV) panel, battery, constant resistance and constant power loads. A dynamic model ...
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This paper studies voltage regulation and maximum power point tracking (MPPT) control for a DC-microgrid that includes a photovoltaic (PV) panel, battery, constant resistance and constant power loads. A dynamic model of the DC-microgrid system described by a multi-input and multi-output nonlinear system with non-affine inputs is derived. based on this nonlinear dynamic model, we use output regulation theory to design a local state feedback controller that regulates voltages to prescribe set points and maximizes PV power output. Global set point regulation is also studied using passive system theory for non-affine systems and Lyapunov stability theory. The effectiveness of the proposed control schemes is investigated using simulations when changes in both illumination and load occur.
There is a consistent demand for reliable, efficient, small-sized, and light weight power supply for electronics devices. To meet the aforesaid requirements, Quasi Resonant converters are being used due to low switchi...
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There is a consistent demand for reliable, efficient, small-sized, and light weight power supply for electronics devices. To meet the aforesaid requirements, Quasi Resonant converters are being used due to low switching losses, high efficiency, small size and weight. With these motivations, in this paper, two different methodologies of passivity-basedcontrollers namely (EL-PBC and PCH-PBC) are proposed for Zero Voltage Switching Quasi Resonant (ZVS-QR) boost converter to regulate the output voltage. First, the Euler-Lagrange (EL) formulation is used to derive state-space equations for ZVS-QR boost converter under different operating modes and then, average state-space model is developed using generalized state space average (GSSA) technique. In order to improve the dynamic performance of the ZVS-QR boost converter, the aforesaid passivity-basedcontrollers are designed and its stability analysis is carried out. The entire system is developed with Sim Power System toolbox of MATLAB software and validated through OP-5142 real time simulator. Steady state and dynamic performances are examined under several operating conditions. It is observed that the passivity-basedcontrollers of the paper achieve robustness against the uncertainties at the input and the load side. It is compared with benchmark PI controller as well.
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