Abstract
In this paper, a proportional-integral passivity-based controller (PI-PBC) is proposed to regulate the amplitude and frequency of the three-phase output voltage in a direct-current alternating-current (DC-AC) converter with an LC filter. This converter is used to supply energy to AC loads in hybrid renewable based systems. The proposed strategy uses the well-known proportional-integral (PI) actions and guarantees the stability of the system by means of the Lyapunov theory. The proposed controller continues to maintain the simplicity and robustness of the PI controls using the Hamiltonian representation of the system, thereby ensuring stability and producing improvements in the performance. The performance of the proposed controller was validated based on simulation and experimental results after considering parametric variations and comparing them with classical approaches.
Highlights
We focus on the problem of the voltage generation in three-phase nonlinear loads located in isolated areas by deriving the proportional-integral passivity-based controller (PI-passivity-based control (PBC)) approach from the classical IDA-PBC method [16], which has not been reported in the scientific literature yet
The controller regulated the amplitude and frequency of the output voltage, and the time response required for the load change was approximately one cycle, thereby agreeing with the previously described simulation results, and this time is acceptable in practical applications as well
We present a PI-PBC controller to regulate the amplitude and frequency of a three-phase output voltage in a direct-current alternating-current (DC-alternating current (AC)) converter with an LC filter
Summary
The objective of the stand-alone microgrids is to provide energies based on green technologies to people in remote areas, permitting them to augment their productive capabilities and enhance their quality of life [2]. This is possible to implement, thanks to the advances in renewable energy technologies that have allowed the installation of power generations in remote areas, which in turn benefit and cover non-interconnected areas. Stand-alone microgrid systems can include different types of energy sources (photovoltaic and wind) [3], storage systems (battery banks and supercapacitors) [4], and loads These elements can be connected through alternating current (AC) or direct current (DC) grids. DC grids are preferred because they have a higher power density than AC grids; in addition, they do not require synchronization and Electronics 2020, 9, 847; doi:10.3390/electronics9050847 www.mdpi.com/journal/electronics
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