Abstract
This paper describes the output voltage regulation control for an interleaved connected to a direct current (DC) microgrid considering bidirectional current flows. The proposed controller is based on an interconnection and damping passivity-based control (IDA-PBC) approach with integral action that regulates the output voltage profile at its assigned reference. This approach designs a control law via nonlinear feedback that ensures asymptotic stability in a closed-loop in the sense of Lyapunov. Moreover, the IDA-PBC design adds an integral gain to eliminate the possible tracking errors in steady-state conditions. Numerical simulations in the Piecewise Linear Electrical Circuit Simulation (PLECS) package for MATLAB/Simulink demonstrate that the effectiveness of the proposed controller is assessed and compared with a conventional proportional-integral controller under different scenarios considering strong variations in the current injected/absorbed by the DC microgrid.
Highlights
Recent advances in power electronics from high- to low-power voltages for direct current (DC) applications make owning DC distribution networks in medium and low voltage levels with high levels of efficiency possible [1,2]
We explore the possibility of employing an interleaved boost converter for output voltage regulation in DC microgrid applications, considering that the grid current can be positive or negative as a function of the amount of renewable energy available and the total power consumption [14]
The application of the interconnection and damping passivity-based control (IDA-PBC) controller to the interleaved boost converter for output voltage regulation in DC microgrids with variable injected/demanded current: to improve the IDA-PBC design’s performance, an integral action is added using the passive output of the system that does not affect the stability properties in closed-loop and allows eliminating the steady-state errors introduced by possible unmodeled dynamics; ii
Summary
Recent advances in power electronics from high- to low-power voltages for direct current (DC) applications make owning DC distribution networks in medium and low voltage levels with high levels of efficiency possible [1,2]. The interleaved boost converter is selected to support the voltage profile due to its simple structure and high capacity for transporting current owing to each parallel connection of inductor branches, allowing bidirectional current flow This converter topology is ideal for applications that involve battery charging/discharging operating conditions, maintaining the voltage profile in the DC microgrid as consistently as possible [15].
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