METHOD FOR ANALYSIS OF QUALITY OF ELECTRIC ENERGY IN THREE-PHASE SYSTEM OF INDUSTRIAL ELECTRICITY SUPPLY Russian patent published in 2022 - IPC G01R19/25 

FIELD: measuring equipment.

SUBSTANCE: invention relates to measuring equipment, namely to assessment of indicators of electric energy quality (EEQ) in a system of industrial electricity supply. A combination of instantaneous values of phase currents and/or voltages is measured, a spatial vector is formed based on Clarke’s transformation of the combination of measured currents and/or voltages. A combination is determined, containing at least one indicator characterizing electric energy quality. Separate indicators of electric energy quality are compared with their normalized values for the current mode of the system of industrial electricity supply. A graph of industrial consumer load is pre-analyzed, and intervals of stationarity of the load graph are detected. Indicators and types of Shewhart control charts are selected on corresponding intervals of stationarity for analysis of electric energy quality, using which statistical resistance of indicators of electric energy quality is determined for the current mode of functioning of the system of industrial electricity supply by comparison of statistical parameters of indicators of electric energy quality with normalized values. Boundary values of Shewhart control charts are selected as normalized values of indicators of electric energy quality, which are generated by the results of simulating modeling of the electricity supply system or real measurements of indicators of electric energy quality at intervals of stationarity of the load graph under conditions of operation of the industrial consumer with compliance with requirements of electric energy quality. The need for implementation of organizational and technical measures for bringing indicators of electric energy quality to normalized values is determined by the results of comparison of statistical parameters of indicators of electric energy quality with normalized values.

EFFECT: provision of automatic analysis of indicators of electric energy quality of an electricity supply system of an industrial consumer.

1 cl, 6 dwg