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DSP based power quality testing system

A test system and power quality technology, which is applied in the direction of measuring electric variables, measuring electricity, measuring devices, etc., can solve problems such as deviation, vibration and insulation damage of electric energy metering equipment, and malfunction of automatic devices, so as to extend the development cycle and develop The effect of simplifying and shrinking the hardware structure

Inactive Publication Date: 2015-01-21
WUHAN UNIV OF TECH
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  • Description
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AI Technical Summary

Problems solved by technology

Power pollution reduces the efficiency of production, transmission and use of electric energy, causes electrical equipment to overheat, vibrate and damage insulation, causes relay protection and automatic device malfunction, and causes deviations in power metering equipment

Method used

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Embodiment Construction

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0019] Such as figure 1 As shown, the DSP-based power quality testing system of the present invention includes: a voltage transformer and a current transformer, a signal conditioning circuit and a DSP minimum system connected to the grid, and the voltage transformer and the current transformer are respectively connected to the signal conditioning circuit Connect, the A / D sampling circuit and frequency capture circuit are respectively connected between the signal conditioning circuit and the DSP minimum system, the DSP minimum system is connected with CPLD internal logic circuit, and the CPLD internal logic circuit is connected with LCD display, real-time Clock, GPRS module and RS232 / 485 interface.

[0020] The minimum DSP system in this embodiment is the most basic system for DSP to work normally. The minimum DSP system in this power...

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Abstract

The invention discloses a DSP based power quality testing system. The system comprises a voltage transformer, a current transformer, a signal conditioning circuit and a DSP minimum system which are connected to a power grid, wherein the voltage transformer and the current transformer are connected with the signal conditioning circuit, an A / D sampling circuit and a frequency capturing circuit are connected between the signal conditioning circuit and the DSP minimum system, the DSP minimum system is connected to a CPLD (complex programmable logic device) internal logic circuit, the CPLD internal logic circuit is connected to an LCD (liquid crystal display), a real-time clock, a GPRS module and an RS232 / 485 interface. The DSP based power quality testing system is more reasonable in hardware structure design and only uses a single CPU, and most of logic circuits at the periphery are realized inside a CPLD, thereby greatly reducing the hardware structure of the system. In addition, software design and development are enabled to be simplified by adopting the hardware structure of the system.

Description

technical field [0001] The invention relates to electric energy quality testing, in particular to a DSP-based electric energy quality testing system. Background technique [0002] With the development of the national economy and the continuous progress of science and technology, electric energy has become the most widely used and indispensable energy source in human society, and the requirements for the quality of electric energy in all walks of life are getting higher and higher. However, with the rapid development and wide application of power electronic technology, especially the massive use of nonlinear loads, the harmonic pollution of power systems is becoming more and more serious. [0003] Due to the characteristics of nonlinearity, impact and unbalance in power system loads, such as steelmaking, steel rolling, chemical industry, electric railway, power electronic equipment and other loads, the voltage and current waveforms of the power grid are distorted and the harm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 佘畅张一飞孙晓璇
Owner WUHAN UNIV OF TECH
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