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Method and apparatus for real time measurement of three phase electrical parameters

A technology of phase electricity and reference vector, applied in the real-time measurement of balanced or unbalanced three-phase electrical parameters, in the field of real-time measurement

Inactive Publication Date: 2001-11-07
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, phase imbalances and frequency variations can adversely affect rotating machinery, electronic equipment, and other devices that use electricity

Method used

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  • Method and apparatus for real time measurement of three phase electrical parameters
  • Method and apparatus for real time measurement of three phase electrical parameters
  • Method and apparatus for real time measurement of three phase electrical parameters

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Embodiment Construction

[0015] A preferred embodiment of the present invention is illustrated at 100 in Figures 1A and 1B. Broadly speaking, in the preferred embodiment, there are three main functional parts, namely quadrature detector, phase locked loop and phase shift feedback. These functional parts will be introduced one by one below. Figure IA is discussed first, but it should be appreciated that most of these functions are repeated in Figure IB, albeit for a different input signal.

[0016] The quadrature detector section preferably includes signal inputs 110a, 110b connected to multiplication blocks 114a, 114b, 114c, 114d, respectively, which are also connected to the reference sine signal 118 and cosine signal of the output voltage controlled oscillator (VCO) 116 120 connections. Each of the multiplication blocks 114a, 114b, 114c, 114d is connected to a low-pass filter 126a, 126b, 126c, 126d which is also connected to a square function 132a, 132a, 132b, 132c, 132d are connected. Additiona...

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Abstract

An apparatus and method for determining, in real time, the key parameters of a three phase system electrical generator's output. A pair of reference vectors in quadrature (orthogonal) is phase-locked to a selected input open delta line to line voltage vector. Preferably, the cosine reference vector is locked 45 DEG out of phase from the selected input vector whereby a best projection of the input vector onto the quadrature pair is provided and increases accuracy in subsequent magnitude and phase calculations. The phase-locked reference vectors provide a basis for computing the magnitude and phase angle for the remaining open delta line to line voltage vectors and three line to neutral current vectors. Instantaneous measurement of magnitude and phase angle for the three line to line voltages and three line to neutral currents, the generator's real power (watts), volt-amperes reactive (VARS), apparent power (VA), power factor (PF) and, as a result of the phase locking, the precise frequency of the generator are possible.

Description

Background of the invention [0001] The present invention relates to real-time measurement of balanced or unbalanced three-phase electrical parameters, such as real-time measurement of power, voltage, current and frequency. Specifically, the invention relates to real-time measurement of balanced or unbalanced three-phase electrical parameters of a generator by using a phase-locked quadrature detector. [0002] Multi-phase, especially three-phase generators are widely used to generate electricity for business and industry, therefore, there is a great need for these generators to produce stable and reliable alternating current. Since these generators are often subject to various power fluctuations, faults, voltage and current overloads, and phase and frequency perturbations, it is necessary to monitor the generator output parameters as closely as possible. Specifically, in the working process of the generator, in order to make the system work safely, the operator needs to obtain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R29/18G01R19/00G01R19/25G01R21/133G01R29/16H02P9/00
CPCG01R29/16G01R21/133G01R19/2513
Inventor J·A·霍格勒M·G·维泽
Owner GENERAL ELECTRIC CO
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