【摘要】：隨著節(jié)能技術和電力電子技術的推廣,各種非線性電力電子裝置如變流設備、變頻設備等的使用日益增多,其對電力系統(tǒng)的影響是產生了大量的電力諧波。諧波嚴重降低電能質量,如任由其發(fā)展則會破壞整個電網(wǎng)的安全穩(wěn)定運行。因此,對諧波問題的解決迫在眉睫,而諧波檢測是解決諧波問題的基礎。由于電力系統(tǒng)具有各種不同類型的諧波源而導致各次諧波的產生,如果能在控制之前對各次諧波的時頻特性進行清晰的掌握,則會大大降低控制難度,提高治理效果,同時也能將諧波清晰的展現(xiàn)在人們面前。針對這一問題本論文研究設計了一套基于TMS320F28335的包含諧波檢測儀與上位機的諧波檢測系統(tǒng),實現(xiàn)對諧波準確、實時、穩(wěn)定的檢測。本論文首先分析了諧波產生的原因以及危害,分析了國內外在諧波檢測方面的研究現(xiàn)狀以及未來的發(fā)展趨勢。以此為基礎,分析比較了FFT、小波變換以及小波包變換的優(yōu)劣,最后提出了FFT聯(lián)合小波包變換的諧波檢測算法,實現(xiàn)了對信號準確、快速的處理。針對復雜的運算以及實時性的要求,選擇了TMS320F28335作為核心處理器。諧波檢測儀能夠單獨實現(xiàn)脫機工作,記錄重要數(shù)據(jù),也能通過以太網(wǎng)與上位機進行通信,以太網(wǎng)控制芯片選擇了ENC28J60。上位機以易控軟件為平臺開發(fā)監(jiān)控界面,諧波檢測儀將采集到的數(shù)據(jù)以及計算的結果通過以太網(wǎng)上傳至上位機,并通過監(jiān)控界面進行顯示。上位機監(jiān)控界面具有web發(fā)布功能,使得能夠通過網(wǎng)頁對遠程進行訪問,同時能將數(shù)據(jù)存儲在自身數(shù)據(jù)庫內,方便后來分析調用。最后,對系統(tǒng)進行了功能性實驗與穩(wěn)定性實驗,證明系統(tǒng)符合國標要求,能夠實現(xiàn)檢測的準確性與快速性,并且能持續(xù)穩(wěn)定運行。
[Abstract]:With the popularization of energy-saving technology and power electronics technology, a variety of nonlinear power electronic devices, such as converter equipment, frequency conversion equipment and so on, are increasingly used. The influence of these devices on power system is to produce a large number of power harmonics. Harmonic seriously reduces the power quality, if it is allowed to develop, it will destroy the safe and stable operation of the whole power grid. Therefore, it is urgent to solve the harmonic problem, and harmonic detection is the basis to solve the harmonic problem. Because the power system has various kinds of harmonic sources, the generation of each harmonic is caused. If the time-frequency characteristics of the harmonics can be clearly grasped before the control, the difficulty of control will be greatly reduced and the treatment effect will be improved. At the same time, the harmonics can also be clearly displayed in front of people. In order to solve this problem, this paper designs a harmonic detection system based on TMS320F28335, which includes harmonic detector and host computer, which can detect harmonics accurately, realtime and stably. In this paper, the reason and harm of harmonic generation are analyzed, and the research status and future development trend of harmonic detection at home and abroad are analyzed. On this basis, the advantages and disadvantages of FFT, wavelet transform and wavelet packet transform are analyzed and compared. Finally, the harmonic detection algorithm of FFT combined wavelet packet transform is proposed, which realizes accurate and fast signal processing. TMS320F28335 is chosen as the core processor to meet the requirements of complex operation and real-time. The harmonic detector can work offline alone, record important data and communicate with host computer via Ethernet. Ethernet control chip chooses ENC28J60.. The monitoring interface is developed on the platform of easy control software. The harmonic detector uploads the collected data and the calculated results to the upper computer through Ethernet and displays them through the monitoring interface. The upper computer monitoring interface has the function of web publishing, which enables remote access through the web page, and can store the data in its own database, which is convenient for later analysis and call. Finally, the functional and stability experiments are carried out on the system, which proves that the system meets the requirements of national standard, can realize the accuracy and rapidity of detection, and can run steadily and continuously.
【學位授予單位】：貴州大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TM935

【相似文獻】

相關期刊論文 前10條

1 李敏;武小紅;郭先定;;基于小波多分辨率分析的電網(wǎng)諧波檢測法[J];電氣應用;2006年01期

2 陸永平;楊貴杰;;對“三次諧波檢測法”的錯誤的辨正[J];微電機(伺服技術);2006年03期

3 周林;甘元興;;一種新型諧波檢測法研究[J];電力電子技術;2006年05期

4 何光普;張建平;李敏;;一種高精度電力諧波檢測法[J];微計算機信息;2007年22期

5 曲軼龍;譚偉璞;馬W，

本文編號：2212356