基于DSP电力谐波测量装置的设计-毕业论文.doc.doc

基于DSP电力谐波测量装置的设计
-硬件设计
摘要
为了能够对电网的运行状况进行监测,本文提出采用DSP技术设计一种电力系统谐波监测仪。该谐波监测仪被安装在检测现场,对电网电压和电流采样信号进行FFT等数学运算和处理,而且可以对数据进行存储、查询,并且在液晶上显示操作菜单等。监测仪能够完成包括三相电压、三相电流的频率、功率因数以及7以的谐波、谐波相位、谐波畸变率等的测量。论文重点介绍了以下几部分:(1)电路的总体设计和功能;(2)硬件设计,包括A/D转换、锁相环、液晶显示和按键输入等原理和电路;(3)系统测试。
关键词:谐波监测,快速傅立叶变换,TMS320LF2407A,数字信号处理
The Exploration of Harmonic Monitoring Apparatus for power System Based on DSP
Abstract
In recent years,with the wide application of various kinds of non一liner loads,the harmonic Pollution of is more and more serious and the quality of electric Power is declining. If the harmonic can’t be controlled,it will affect the whole running safe and economical. So,it is necessary to prevent the harmonic Peril and to assure safe running of the power system with detecting accurate harmonic content and predominating harmonic practice status firmly.
Firstly,the paper generally introduces the theory of the harmonic analysisalgorithm. There into,there are difficulties in performing synchronized samplingand integral period truncation for the harmonic analysis in the Power system with the Fast Fourier Trans form(FFT),the result of the electric power harmonic detection is disturbed by the frequency leakage,so the Window-interpolation FFT is introduced. This paper analyzes and deduces the Window一interpolation FFT algorithm in detail,then analyzes the algorithm by matlab simulation. The simulation results have verified the effectiveness and practicability of the algorithm. Secondly,the paper uses the DSP processor chip TMS320LF2407A as hardware core and gives detection system’s hardware design in detail,such as signal gathering part, A/D converting part,liquid crystal displaying Part,munication part and so on. Finally,the dissertation finishes the main software design and gives corresponding module’s procedure process.
The software of harmonic detection algorithm has been debugged in laboratory. The practical simulating has Proved that the analysis of the theory is correct,the re