Power measurement device

A technology of power measurement and frequency value, which is applied to measurement devices, electric power measurement by using pulse modulation, and electric power measurement by applying digital technology, etc. It can solve the problems of complexity of useful data flow, inability to achieve perfect gain and aperture matching, etc.

Inactive Publication Date: 2013-12-18
SMART ENERGY INSTR
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Problems solved by technology

The use of two circuits introduces the complexity of combining the data into a single useful data stream
Gain and aperture matching between two circuits cannot be achieved perfectly

Method used

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Embodiment Construction

[0016] The following simplified descriptions in the specification are for convenience of explanation. For example, those skilled in the art will appreciate that in many cases a power measurement device may be configured to measure three phases of voltage and current, and that voltage and / or current are unidirectional in the embodiments described herein for simplicity of description. .

[0017] first reference figure 1 , which shows a simplified block diagram of a power measurement device 10 . The device 10 includes a one-bit delta-sigma modulator (DS) 12 for measuring electrical quantities (voltage or current in one phase) and producing a one-bit signal or bit stream 14 . The timing of the DS modulator 12, and therefore the bit rate of the output bit stream 14, ranges from 10 kHz to 6 MS / s, depending on the resolution and frequency response required in the embodiment. This will be understood as the traditional DS converter adopts a low-pass filter at the output to remove th...

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Abstract

A power measurement device for sampling current or voltage signals of a power system to produce a 1-bit delta-sigma bitstream. The power measurement device includes a frequency locked loop for determining the power system frequency directly from the -bit delta-sigma bitstream. The frequency locked loop includes a 1-bit rotate CORDIC that is configured to produce difference signals having a multi-bit word for each bit of the 1-bit delta-sigma bitstream, and a phase error calculator that determines the difference between the phase of the power system frequency and a phase ramp generated from a frequency measurement value in a frequency register. The phase error calculator feeds back a phase correction signal to the frequency register to lock the frequency measurement value to the power system frequency.

Description

technical field [0001] The utility model relates to a measurement and monitoring of an electric power system, in particular to a device for synchronous phasor measurement, transient capture and report. Background technique [0002] Current efforts to improve monitoring and event reporting of power systems focus on detecting and correlating data from a few scattered sites on the network. In order to achieve synchronized readings, local data sampling is usually with respect to a time base synchronized to an absolute time reference, such as can be obtained through the Global Positioning System (GPS). Measure the current and voltage values ​​of the sample of the device and analyze the data, such as harmonic analysis. Typical sampling rates range from 1 to 12 kHz for high-resolution measurements, or 500 times the frequency (e.g. to 6 MS / s) for high-speed low-resolution transient signal detection. A typical power system measurement setup uses separate circuits with different sam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/25H03L7/08
CPCG01R19/2506G01R19/2513G01R21/127G06F7/602G01R21/133H03M3/322G01R25/00
Inventor 唐纳德·杰弗里·迪翁
Owner SMART ENERGY INSTR
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