Frequency-conversion harmonic measuring device of electrical power system

A technology for measuring devices and power systems, which is applied to measuring devices, measuring electrical variables, and spectrum analysis, etc., can solve the problems of low measurement accuracy, poor real-time performance, and high cost, and achieve the effects of wide measurement range, low cost, and convenient operation and maintenance.

Inactive Publication Date: 2010-07-21
SHANGHAI HUAJIAN ELECTRICAL EQUIP
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] In order to overcome the disadvantages of low measurement accuracy, poor real-time performance and high cost of existing harmonic measurement devices, the present invention provides a low-cost power system frequency conversion harmonic measurement device that can quickly and accurately measure power system harmonics

Method used

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  • Frequency-conversion harmonic measuring device of electrical power system
  • Frequency-conversion harmonic measuring device of electrical power system
  • Frequency-conversion harmonic measuring device of electrical power system

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Embodiment Construction

[0014] The present invention is further described below in conjunction with accompanying drawing:

[0015] See attached drawings 1 and 2, the connection of the harmonic measurement device is to use the DSP unit (1) and the power supply unit (3) to connect with the AC unit (2), the display unit (5), and the input and output unit (4) respectively . The internal connection of DSP unit is connected by DSP(6) and 16bit BUS(12), DSP(6) is connected with display unit(5) through HPI, DSP(6) is connected with PC(13) through RS485, DSP(6) It is connected with frequency measurement circuit (9) through external interrupt; 16bit BUS (12) is connected with FLASH (10), SDRAM (11) and AD (8); AD (8) is connected with second-order RC filter (7).

[0016] See attached drawings 1 and 2. In the power system, where protection and measurement and control are required, the three-phase voltage and current are connected to the AC unit (2), converted into voltage signals within the AD sampling range, ...

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Abstract

The invention relates to a frequency-conversion harmonic measuring device of an electrical power system, comprising a DSP (Digital Signal Processor) unit, an alternating current unit, a power supply unit, an input / output unit and a display unit, wherein the power supply unit directly communicates with other modules; the alternating current unit converses an input alternating current signal; the DSP unit and the alternating current unit are connected; and the display unit and the input / output unit are connected, and thus, the measurement on the electrical power system is realized, and the realized frequency-conversion harmonic measuring device of the electrical power system has the characteristics of wide measurement range, high accuracy, good real-time performance, wide scope of application, low cost and convenient operation and maintenance.

Description

1. Technical field [0001] The invention relates to a frequency conversion harmonic measuring device which combines DSP technology and fast Fourier algorithm. The invention belongs to the technical field of harmonic measurement of electric power system. 2. Background technology [0002] Existing harmonic measurement technology and analysis instruments, partly use ordinary single-chip microcomputer as CPU, external analog-to-digital converter, memory and software to form a microcomputer power harmonic analysis instrument. This type of harmonic analysis device has low precision and relatively low real-time performance. Poor, can no longer meet the requirements of the rapid development of the power industry. There are also some harmonic measuring instruments that use POWERPC chips as the processing core, and adopt the method of fixed-frequency sampling, which is costly and complicated in software processing. 3. Contents of the invention [0003] In order to overcome the shor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/00G01R23/16
Inventor 王晓辉张锋王琦刘尧华
Owner SHANGHAI HUAJIAN ELECTRICAL EQUIP
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