Power meter based on Red Pitaya developement system

V zadnjem času lahko opazimo veliko porast nelinearnih bremen, ki v tokokrogih povzročajo višje harmonske komponente, le-te so v splošnem nezaželene in škodljive. Velik poudarek se zato daje na analizo razmer v takšnih tokokrogih. Vse dostopnejši in zmogljivejši postajajo razvojni sistemi. Eden takšnih je Red Pitaya, ki je integrirano merilno vezje z odprtokodno programsko opremo. V nalogi je predstavljen postopek razvoja aplikacije analizatorja električne moči z Red Pitayo. V drugem poglavju so podane različne definicije veličin v tokokrogih z nesinusnimi razmerami. V tretjem poglavju so podani in primerjani postopki za merjenje frekvence, efektivne vrednosti ter faznega premika med tokom in napetostjo. V četrtem poglavju je predstavljena izbrana razvojna platforma in postopek razvoja novih aplikacij za njo. V petem poglavju je predstavljena izdelana aplikacija in implementacija izbranih algoritmov. Za analizo so izbrani postopki diskretne Fouriereve transformacije. V šestem poglavju je zmogljivost izdelane aplikacije primerjana z laboratorijskim instrumentom. Rezultati meritev z razvito aplikacijo so zadovoljivo točni, izpolnjeni so tudi zadani cilji, saj je aplikacija enostavna za uporabo in omogoča dober pregled razmer v tokokrogu.Non-linear loads are responsible for producing unwanted higher current harmonics in power systems. Because they are becoming increasingly more common, there is currently high emphasis given on precision power analysis. Development systems are also becoming more powerful and accessible. One of those is Red Pitaya, which is an open-source-software measurement tool. In this thesis the process of developing power analyzer application for Red Pitaya is presented. Definitions for electrical power in nonsinusoidal conditions are listed in second chapter. In third chapter different procedures for measuring frequency, RMS value and phase difference of voltage and current are compared. In fourth chapter process of developing new applications and selected development platform is presented. In fifth chapter implementation of selected algorithms and developed application are presented. Discrete Fourier transform algorithms were selected for power analysis. Performance of developed application is compared with precision laboratory instrument in chapter six. Performance of developed application meets objectives because it is satisfactory accurate, easy to use and provides good overview of conditions in measured system