| 摘要 |
Disclosed is a phase identification system (70) for an electricity distribution network. The system (70) includes a power distribution station (12) having a phase distortion device (72). The phase distortion device (72) generates voltage distortions of a known harmonic frequency in at least one of three phase voltage signals of the power distribution station (12). The system also includes a phase detection device (22) configured to receive at least one of distorted three phase voltage signals and to identify a phase of the received voltage signal. The phase detection device (22) is comprised of a delay circuit, a transformation module and a phase determination module. The delay circuit generates a phase-shifted voltage signal of the received voltage signal. The transformation module transforms the received voltage signal and the phase-shifted voltage signal into d-q domain voltage signals of a known harmonic frequency reference frame. The phase determination module determines the phase of the received voltage signal by comparing an amplitude of a harmonic of the known harmonic frequency in the received voltage signal with a threshold value. |
