Phase identification system and method

摘要

A phase identification system includes a power distribution station and a phase detection device. The power distribution station includes a phase distortion device for generating voltage distortions of a known harmonic frequency in at least one of three phase voltage signals of the power distribution station. The phase detection is 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 includes a delay circuit to generate a phase shifted voltage signal of the received voltage signal and a transformation module to transform the received voltage signal and the phase shifted voltage signal into d-q domain voltage signals of a known harmonic frequency reference frame. A phase determination module in the phase detection device determine 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.

主权项

1. A phase identification system, comprising:
a power distribution station including a phase distortion device to generate voltage distortions of a known harmonic frequency in at least one of three phase voltage signals of the power distribution station; and a phase detection device 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 comprising:
a delay circuit for generating a phase shifted voltage signal of the received voltage signal;a transformation module for transforming the received voltage signal and the phase shifted voltage signal into d-q domain voltage signals of a known harmonic frequency reference frame;an amplitude calculation module for calculating an amplitude of a harmonic of the known harmonic frequency in the received voltage based on the d-q domain voltage signals; anda phase determination module for determining the phase of the received voltage signal by comparing the amplitude of the harmonic of the known harmonic frequency in the received voltage signal with a threshold value.