抄録
This paper proposes and analyzes a new simple real-time phase-estimation method for single-phase signals, which is based on a vector mapping theory of n-dimensional to 2-dimensional vectors. According to the analyses, the proposed mapping method can estimate instantly and properly the true phase of the signals that are contaminated by significant amplitude of noise and harmonics. The mapping method contains the conventional DFT method as a special case. In other words, it can be treated as a generalization of the DFT. Several simple realizations of the mapping method are also newly proposed as a single-input and two-output digital mapping filter in both non-recursive and recursive forms. The recursive realization being able to decrease drastically computing load utilizes the normal form that is robust to finite word length effects. As an application of the proposed mapping method, inverter-used power control system connected with a single-phase gird is shown. All analytical results are verified by numerical experiments and usefulness of the newly proposed mapping method is confirmed.
