【摘要】：電力系統(tǒng)的迅猛發(fā)展和電力電子技術(shù)的廣泛應(yīng)用使得電能污染日益嚴(yán)重。電能質(zhì)量問(wèn)題已經(jīng)成為電力部門(mén)及用戶越來(lái)越關(guān)注的熱點(diǎn)。而只有通過(guò)有效的監(jiān)測(cè)和分析,才能發(fā)現(xiàn)電能質(zhì)量問(wèn)題的所在,并提出解決問(wèn)題的方案,提高系統(tǒng)的電能質(zhì)量。首先,本文介紹了電能質(zhì)量監(jiān)測(cè)裝置的研究背景、意義和研究現(xiàn)狀,給出了裝置在功能和性能方面的具體要求。簡(jiǎn)單介紹了電能質(zhì)量的影響指標(biāo),給出了相應(yīng)國(guó)家標(biāo)準(zhǔn)規(guī)定的限值要求,并對(duì)頻率偏差、電壓偏差和三相不平衡的檢測(cè)算法作了簡(jiǎn)要的說(shuō)明;重點(diǎn)介紹了電壓波動(dòng)與閃變的檢測(cè)原理,經(jīng)MATLAB驗(yàn)證了IEC閃變儀的可行性;針對(duì)諧波與間諧波互相干擾的問(wèn)題,本文提出了一種基于梳狀濾波器和IEC法的組合方法,在實(shí)現(xiàn)諧波間諧波的有效分離之后,分別計(jì)算出其參數(shù),并經(jīng)DSP驗(yàn)證,該組合方法確實(shí)能夠提高兩者的檢測(cè)精度;電壓暫降的檢測(cè)需兼顧精確性和實(shí)時(shí)性,在對(duì)比多種算法之后,本文采用了半周波刷新方均根值法,并經(jīng)MATLAB驗(yàn)證了該算法的合理性。其次,對(duì)電能質(zhì)量在線監(jiān)測(cè)裝置的整體系統(tǒng)框圖做了詳細(xì)分析,設(shè)計(jì)了一種以DSP為數(shù)據(jù)處理核心和以ARM為人機(jī)交互核心的雙CPU模式的電能質(zhì)量在線監(jiān)測(cè)裝置,并對(duì)主要芯片的選型及其特點(diǎn)進(jìn)行了簡(jiǎn)要說(shuō)明。在硬件方面,按照模塊化設(shè)計(jì)的思路,對(duì)裝置的數(shù)據(jù)采樣模塊、數(shù)據(jù)處理模塊和人機(jī)交互管理模塊分別進(jìn)行了設(shè)計(jì),并給出了具體的硬件設(shè)計(jì)電路。軟件方面,介紹了DSP子系統(tǒng)和ARM子系統(tǒng)的軟件總體設(shè)計(jì),給出了各功能模塊的軟件開(kāi)發(fā)流程,并在CCS3.3的開(kāi)發(fā)平臺(tái)上,進(jìn)行了系統(tǒng)開(kāi)發(fā)工作。最后,通過(guò)標(biāo)準(zhǔn)源產(chǎn)生的電壓、電流、諧波間諧波等各類信號(hào),對(duì)該裝置做了誤差分析,驗(yàn)證了該裝置具有良好的檢測(cè)精度,滿足性能和功能方面的要求,且運(yùn)行穩(wěn)定。
[Abstract]:With the rapid development of power system and the wide application of power electronics technology, the pollution of electric energy is becoming more and more serious. The problem of power quality has become the focus of more and more attention of power departments and users. Only through effective monitoring and analysis, the problem of power quality can be found, and the solution to the problem can be put forward to improve the power quality of the system. First of all, this paper introduces the research background, significance and research status of the power quality monitoring device, and gives the specific requirements in function and performance of the device. In this paper, the influence index of power quality is briefly introduced, the limit requirements of the corresponding national standards are given, and the detection algorithms of frequency deviation, voltage deviation and three-phase imbalance are briefly explained. The detection principle of voltage fluctuation and flicker is introduced emphatically, and the feasibility of IEC flicker is verified by MATLAB. In order to solve the problem of mutual interference between harmonics and interharmonics, a combination method based on comb filter and IEC method is proposed in this paper. After the effective separation of inter-harmonic harmonics, the parameters are calculated and verified by DSP. The combination method can improve the detection accuracy of the two methods. In the detection of voltage sags, both accuracy and real-time need to be taken into account. After comparing various algorithms, a half-cycle brush root-mean-square method is adopted in this paper, and the rationality of the algorithm is verified by MATLAB. Secondly, the whole system block diagram of the on-line monitoring device for power quality is analyzed in detail, and a kind of on-line monitoring device for power quality based on DSP as data processing core and ARM as the core of human-computer interaction is designed. The selection and characteristics of the main chips are briefly described. In the aspect of hardware, according to the idea of modularization design, the data sampling module, data processing module and man-machine interaction management module of the device are designed, and the specific hardware design circuit is given. In the aspect of software, the software design of DSP subsystem and ARM subsystem is introduced, the software development flow of each function module is given, and the system development work is carried out on the development platform of CCS3.3. Finally, through the voltage, current, inter-harmonic harmonics and other signals generated by the standard source, the error analysis of the device is carried out, and it is verified that the device has a good detection precision, meets the requirements of performance and function, and operates stably.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM930

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本文編號(hào)：2471485