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The Research and Design of the Multifunction Power Quality Monitor

Author: WuHaiQiang
Tutor: LingYuHua
School: Central South University
Course: Control Engineering
Keywords: Power Quality Monitor TMS320C6711D ADS8365 Industrial Controlling Computer
CLC: TM76
Type: Master's thesis
Year: 2011
Downloads: 193
Quote: 2
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Abstract


With the rapid development of power systems, the requirements of the power quality and reliability are increasing. However, the nonlinear power system load and impact load has become more and more serious and caused pollution to the power quality. How to improve the power quality has become an urgent requirement to guarantee the power system security and power grid running stability.At first, the evaluation indicators of power quality and national standards are introduced in this thesis. The domestic and international researches of power quality are analyzed. Various types of power quality’s monitoring principles and calculation methods are summarized. All these provide the necessary theoretical basis for the multifunction power quality monitor’s developing.Secondly, the monitor’s hardware is studied along with the analysis of monitor’s hardware and software requirements, the advanced modular concept is adopted in the hardware design, the host and slave is applied to the overall structure. The embedded industrial control computer is used in the host to exchange the data with DSP and accomplish the functions of statistical analysis, storage, man-machine interface and communications and etc; TMS320C6711D and Multi-channel high-speed precision ADS8365 are combined to complete power basic data collection, power parameters calculation, power quality index calculation, and data exchange with the host in high-speed. In addition, the industrial switching power and the temperature-controlled fan are used in the monitor. The fan can effectively solve the cooling problem so that the equipment can work reliably and efficiently.Finally, software design of the monitor is introduced. Software includes DSP’s program, industrial control computer’s program, programmable logic devices’program and automatic calibration software based on PC. C and assembly language mixed programming are used and the modular, top-down, and step-by-step refining programming ideas are followed in the software which successfully complete the voltage and current collection, calibration, power basic parameters calculation, power quality index calculation, analysis, storage and communications with the management module. The embedded Linux operating system is also applied to complete statistics, analysis, storage, communications, display, touching screen operation. CPLD is used to make program to realize logic combination and timing match.It’s showed from the test that the monitor has reached or surpassed the advanced level of similar products in functionality and performance at home and abroad, and it has passed Hunan Science and Technology Appraisement.

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CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Power system automation
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