Abstract
In this paper, a direct power predictive controller (DPPC) is derived for a current source inverter (CSI) based single stage photovoltaic (PV) system. The equations of the dynamics, including AC and DC filters, are formulated directly for the PV power and for the active and reactive power injected in the grid. Then, the prediction equations are synthesized straight for the power, and, at each time instant, the optimal switching vector that guarantees simultaneously the control of the power generated by the PV arrays, and the control of the reactive power in the connection to the grid is chosen. This approach aims to guarantee fast and accurate tracking of the power. The proposed system is then validated through simulation and experimental results, showing that the PV system is able to follow the power references, guaranteeing a fast response to a step in the power, and decoupled active and reactive power control, with minimum total harmonic distortion (<5%) of the currents injected in the grid.
Highlights
The requirements of decarbonization are leading to the massive integration of renewable energies in the grid [1,2]
Qrefin using current source inverter (CSI) in PV systems, which result in increased power density, lower costs, and increased lifetime of the 0 to 500
PV systems, which result in increased power density, lower costs, and increased lifetime of the inverter
Summary
The requirements of decarbonization are leading to the massive integration of renewable energies in the grid [1,2]. International standards regulate power quality in the connection of PV inverters to the grid, bounding the harmonic content of the injected currents and setting limits to power factor regulation. 1547-2018 [6] provides a set of requirements for interconnection and interoperability of distributed resources with power system interfaces; IEC 61000-3-2 [7] sets limits for current harmonic emissions; IEEE Std 519-2014 [8] recommends practices and requirements for harmonic control in electric power systems with a set of recommended limitations for voltage and current harmonics; and IEC 61727 [9]. Lays down a set of requirements for the interconnection of PV systems to the distribution grid. Two of the most important impositions of these standards is the bounding of the total harmonic distortion (THD) of the injected currents, up to the 50th harmonic, to around 5%, and setting the minimum
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