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Proportional-integral controllers performance of a grid-connected solar PV system with particle swarm optimization and Ziegler-Nichols tuning method
Klemen Deželak, Peter Braciník, Klemen Sredenšek, Sebastijan Seme, 2021, original scientific article

Abstract: This paper deals with photovoltaic (PV) power plant modeling and its integration into the medium-voltage distribution network. Apart from solar cells, a simulation model includes a boost converter, voltage-oriented controller and LCL filter. The main emphasis is given to the comparison of two optimization methods-particle swarm optimization (PSO) and the Ziegler-Nichols (ZN) tuning method, approaches that are used for the parameters of Proportional-Integral (PI) controllers determination. A PI controller is commonly used because of its performance, but it is limited in its effectiveness if there is a change in the parameters of the system. In our case, the aforementioned change is caused by switching the feeders of the distribution network from an open-loop to a closedloop arrangement. The simulation results have claimed the superiority of the PSO algorithm, while the classical ZN tuning method is acceptable in a limited area of operation.
Keywords: photovoltaic power plant, optimization, PI controllers, distribution system
Published in DKUM: 10.11.2023; Views: 286; Downloads: 12
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Reconfigurable digital controller for a buck converter based on FPGA
Miro Milanovič, Mitja Truntič, Primož Šlibar, Drago Dolinar, 2007, original scientific article

Abstract: This paper presents a complete digitally controlled dc-dc buck converter performed by FPGA circuitry. All tasks, analog to digital conversion, control algorithm and pulse width modulation, were implemented in the FPGA. This approach enables high-speed dynamic response and programmability by the controller, without external passive components. In addition, the controller's structure can be easily changed with out external components. The applied algorithm enables a switching frequency of 100 kHz.
Keywords: converters, digital controllers, FPGA
Published in DKUM: 01.06.2012; Views: 1862; Downloads: 98
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Fuzziness versus probability again
Franc Jurkovič, 2005, other component parts

Keywords: fuzzy logic, probability, controllers
Published in DKUM: 01.06.2012; Views: 2136; Downloads: 29
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