METHOD OF SEPARATING COMPONENTS OF THREE-PHASE ELECTRICAL QUANTITY Russian patent published in 2024 - IPC H02H3/38 

FIELD: electrical engineering.

SUBSTANCE: components of three-phase electrical quantity are converted into digital signals of the same name, component composition of each digital signal is determined by methods of adaptive structural analysis and its components are taken as terms of the same component of the three-phase electric quantity. For this purpose, three components are formed, two of which are free from zero sequence, and the third is the component of zero sequence. First adaptive filter is tuned to suppress the first and second intermediate signals using the entire set of their readings for its tuning, and the second adaptive filter is tuned to suppress the third intermediate signal based on only its readings. Roots of characteristic equations of both adaptive filters are determined and a component model of each digital signal is formed from the set of roots of all adaptive filters. First and second intermediate signals are generated according to the rules of modal or linear transformations, and the third intermediate signal is proportional to the sum of digital signals of all three phases. Clarke's transformation, Karrenbauer's transformation and Wedepohl's transformation can be used as modal transformations. Higher resolution of the method is achieved by reducing the number of components in the signal recognized by each of the adaptive filters, as well as an increase in the number of adaptive filter adjustment equations when detecting a zero sequence by reducing the number of recognized components, and when processing non-zero components also due to joint use of readings of the first two intermediate signals.

EFFECT: high resolution and accuracy of estimating components of a three-phase electrical quantity, especially when it is presented over a short period of time.

5 cl, 5 dwg