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.

Claims

22 · 2 independent · depth 6

22 granted claims

›1.independentA phase identification system, comprising:na power distribution station including a phase distortion device to generate voltage distortions of a known…+15

›2.↳ 1The phase identification system of claim 1, wherein the known harmonic frequency is different for different phase voltage signals.d2+1

›4.↳ 1The phase identification system of claim 1, wherein the phase distortion devices comprises a voltage distortion circuit.d2+7

›5.↳ 4The phase identification system of claim 4, wherein the voltage distortion circuitry comprises a series voltage injection circuit for injecting harmon…d3

›6.↳ 4The phase identification system of claim 4, wherein the voltage distortion circuitry comprises a shunt current circuitry for drawing harmonic currents…d3+5

›7.↳ 6The phase identification system of claim 6, wherein the shunt current circuitry comprises a single phase DC to AC converter for drawing a reference ha…d4+4

›12.↳ 1The phase identification system of claim 1, wherein the phase shifted voltage signal is delayed by 90 degrees compared to the received voltage signal.d2

›13.↳ 1The phase identification system of claim 1, further comprising an amplitude calculation module to calculate the amplitude of the harmonic of the known…d2

›14.↳ 1The phase identification system of claim 1, further comprising an amplitude calculation module to calculate the amplitude of the harmonic of the known…d2

›15.↳ 1The phase identification system of claim 1, further comprising low pass filters to block high frequency content of d-q domain voltage signals and prov…d2

›16.↳ 1The phase identification system of claim 1, wherein the distortions are generated upon command, on a schedule, or both upon command and on a schedule.d2

›17.independentA method of identifying phase comprising:ndistorting at least one of three phase voltage signals of a power distribution system with a known harmonic …+5

Classifications

2 codes

IPC · International Patent Classification

Section G — Physics

G01R19/00

USPC · US Patent Classification

324/66

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Melissa Koval

art unit 2866 · TC 2800

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Type	Document	Date
related publication	US 20130049732 A1	28 Feb 2013

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