| 摘要 |
<p>A method and an apparatus for determining a phase (theta) and a frequency (omega) of an electric quantity being associated with an operation of an electrical device are described. The method comprises extracting a fundamental component (Valpha1, Vbeta1) of the electric quantity, calculating a positive sequence component (V+ alpha1, V+ beta1) of the electric quantity based on the extracted fundamental component (Valpha, Vbeta ), and determining the phase and the frequency of the electric quantity based on the calculated positive sequence component (V+ alpha1, V+ beta1).</p> |
