The paper presents a shunt hybrid active power filter for 1 kV mining applications in configuration with a single-tuned passive filter. The focus is on the method of controlling the filter, with particular emphasis on the influence of network voltage distortion and time delays in control on the effectiveness of harmonic reduction, which is one of the most important aspect of power quality. The low-power loss configuration of a hybrid filter with SiC transistors is shown, as well as the control algorithm which limits the influence of voltage distortion. Theoretical considerations are verified by results obtained from simulations and tests of the hybrid active power filter prototype.

W artykule zostanie opisana metoda wyznaczania stanu naładowania oraz ładunku całkowitego akumulatorów w oparciu o licznik ładunku. Metoda cechuje się dużą uniwersalnością ze względu na możliwość zastosowania dla różnych rodzajów akumulatorów. Została z powodzeniem przetestowana w akumulatorach litowo-jonowych, litowo-żelazowo-fosforanowych, niklowo-kadmowych oraz kwasowo-ołowiowych. Sprowadza się użycia prostych obliczeń algebraicznych, dzięki czemu może być łatwo implementowana za pomocą prostych 8-bitowych układów mikrokontrolerowych.

In the paper was presented a method of compensating for the temperature drift of the zero component of four-electrode low-range electrochemical sensors of gas concentration: nitrogen dioxide and sulfur dioxide. The method is based on a long-term series of measurement results from these sensors. Statistical analysis of the results at changing ambient temperature enables the identification of temperature drift baseline that is unique for a given sensor unit. The accuracy of the curve estimation was additionally increased by using a series of results from standard measures in the validation process. The proposed method is to facilitate the use of electrochemical sensors for the construction of cheap and portable detectors of nitrogen dioxide and sulfur dioxide concentrations included in the atmospheric air.