【摘要】：電力系統(tǒng)供電電能質(zhì)量對(duì)我國(guó)經(jīng)濟(jì)的發(fā)展和人們生活水平的提高有著重大的影響。良好的電能質(zhì)量有利于電氣設(shè)備的正常運(yùn)行,保障了科學(xué)實(shí)驗(yàn)和工業(yè)生產(chǎn)的正常進(jìn)行,有效的降低了能源的消耗。 本文首先簡(jiǎn)要地介紹了電能質(zhì)量的相關(guān)概念及國(guó)家標(biāo)準(zhǔn)。接著,深入地研究了電能質(zhì)量檢測(cè)及無(wú)功補(bǔ)償技術(shù)的軟硬件實(shí)現(xiàn)。在硬件方面,采用NXP公司的LPC2136作為主控芯片,通過(guò)運(yùn)算放大器搭建出信號(hào)調(diào)理電路,將電網(wǎng)的大電壓和大電流變換成芯片能夠采集的電壓信號(hào),將調(diào)理好的信號(hào)接入芯片的A/D采樣口進(jìn)行采樣,并且設(shè)計(jì)出繼電器驅(qū)動(dòng)電路,根據(jù)檢測(cè)到的電能參數(shù)適時(shí)地進(jìn)行無(wú)功補(bǔ)償控制。利用Saber軟件對(duì)設(shè)計(jì)好的電路進(jìn)行仿真,仿真分析成功后搭建實(shí)際的電路進(jìn)行測(cè)試,并最終制出PCB板。在軟件方面,通過(guò)改進(jìn)的快速FFT算法進(jìn)行諧波分析,進(jìn)而得出穩(wěn)態(tài)情況下電網(wǎng)的運(yùn)行參數(shù)。根據(jù)檢測(cè)的系統(tǒng)參數(shù),同時(shí)運(yùn)用改進(jìn)的九域算法作為無(wú)功補(bǔ)償?shù)目刂撇呗赃M(jìn)行繼電器的投切。 最后,通過(guò)信號(hào)發(fā)生器給定一個(gè)信號(hào),分析檢測(cè)出的電能參數(shù)與所給定值之間的偏差。通過(guò)多組實(shí)驗(yàn)數(shù)據(jù)分析,該系統(tǒng)能夠比較準(zhǔn)確的測(cè)出給定信號(hào)中的電壓偏差、頻率偏差、諧波含量、功率因數(shù)等表征電能質(zhì)量的相關(guān)參數(shù)。高精度的檢測(cè)為提高電能質(zhì)量提供了可靠的依據(jù)。
[Abstract]:The quality of power supply in power system has great influence on the development of economy and the improvement of people's living standard. Good power quality is conducive to the normal operation of electrical equipment, ensuring the normal conduct of scientific experiments and industrial production, and effectively reducing the consumption of energy. In this paper, the concept and national standard of power quality are introduced briefly. Then, the hardware and software realization of power quality detection and reactive power compensation are studied. In the aspect of hardware, the LPC2136 of NXP Company is used as the main control chip, and the signal conditioning circuit is built by the operational amplifier. The large voltage and current of the power grid are converted into the voltage signals which can be collected by the chip. The adjusted signal is connected to the Ar / D sampling port of the chip and the relay drive circuit is designed to control reactive power compensation timely according to the detected power parameters. Saber software is used to simulate the designed circuit. After the simulation and analysis, the actual circuit is built and tested, and finally the PCB board is produced. In the aspect of software, the harmonic analysis is carried out by the improved fast FFT algorithm, and then the operation parameters of the power network under steady state are obtained. According to the system parameters, the improved nine-domain algorithm is used as the reactive power compensation control strategy to switch the relay. Finally, the deviation between the detected electric energy parameters and the given values is analyzed by using the signal generator to give a signal. The system can accurately measure the voltage deviation, frequency deviation, harmonic content, power factor and other related parameters of power quality in a given signal through the analysis of multiple sets of experimental data. The high-precision detection provides a reliable basis for improving the power quality.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TM761.12

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