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Solar photovoltaic interconnected ZSI-unified power quality conditioner to enhance power

Raja A., Vijayakumar M., Karthikeyan C.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2022

Vol. 70, nr 1

art. no. e140015

In order to ensure that all the connected Equipment in the distribution network operates smoothly, the voltage stability of photovoltaic (PV) integrated distribution systems is very important. Sustaining the voltage profile when integrating PV is a particularly difficult issue. The primary goal of this article is to provide a consistent voltage profile to a sensitive load. A three-phase PV integrated distribution system has been chosen for investigation. An innovative feature of this system is that UPQC DVR and STATCOM systems are powered by Z-source inverters instead of traditional inverters. The ability to actively decouple power is the primary benefit of utilizing a Z-source inverter. The objective of the study effort is to use this new UPQC to synchronize a solar PV system with the distribution system. For the UPQC with battery energy storage system (BESS), the research study examines and develops the most appropriate control approach. A UPQC is a device that is used to integrate solar panels and improve the voltage stability of the distribution system. The prototype model is being developed, and the experimental findings confirm the main objective.

Changes of human brain bioelectrical activity during photic stimulation as an indicator of brain functional state

Tuulik V., Meister A., Lossmann E., Raja A.

Biocybernetics and Biomedical Engineering

2001

Vol. 21, no. 1

77-82

A spectral analysis-based technique for computer-assisted analysis of multi-channel EEG signals is proposed to feature the effects of photic driving on the bioelectric activity and coherence parameters for different EEG rhythms. The method is evaluated on a set of ten EEG recordings from healthy test subjects. Some conclusions have been made with respect to the effect of different types of photic driving (general and afferent) to brain bioelectrical activity (BA) parameters and coherences between the BA of left and right hemisphere. The BA and coherence parameters were analyzed separately for the groups of subjects with high and low basic alpha-rhythm level.

W pracy analizowano wpływ stymulacji świetlnej na zmianę parametrów koherencji i rytmów sygnalów EEG. W tym celu proponuje się wykorzystanie analizy wieloelektrodowych sygnałów EEG opartej na analizie spektralnej. Proponowana metoda została oceniona na dziesięciu zapisach sygnałów EEG osób zdrowych. Wnioski oparte na wynikach eksperymentu dotyczą wpływu sposobu stymulacji na aktywność bioelektryczną mózgu oraz koherencji takiej aktywności w prawej i lewej półkuli. Aktywność bioelektryczna oraz parametry koherencji były analizowane oddzielnie dla grup pacjentów z wysokim i niskim poziomem podstawowym rytmu alfa.