本文選題：電壓波動與閃變 + IEC閃變儀　； 參考：《中國礦業(yè)大學》2014年碩士論文

【摘要】：隨著我國經(jīng)濟的發(fā)展和科學技術的提高，對電能的需求不斷增加，同時用電負荷呈現(xiàn)出非線性、非對稱性和波動性，隨著波動性負荷所占比例不斷變大，給電網(wǎng)的電能質量帶來新的威脅。作為電能質量的一個重要指標，，電壓波動與閃變愈發(fā)得到大家的關注。 本文首先從電壓波動與閃變的概念入手，介紹了其定義、標準與衡量電壓波動與閃變的特征量，分析了閃變的來源、危害及其補償措施，然后簡單的介紹了現(xiàn)有的電壓波動與閃變檢測方法的原理、特點并做了對比。由于在此之前國際電工委員會（IEC）發(fā)布了閃變儀的設計框圖，本文通過運用仿真軟件對該框圖進行了驗證并且論述了誤差出現(xiàn)的原因。針對某變電站電能質量測試中發(fā)現(xiàn)的發(fā)生單相接地時電壓波動與閃變值產(chǎn)生突變的現(xiàn)象，應用仿真軟件分析了在發(fā)生單相接地情況下平方檢測法的利弊，并研究了其對電壓閃變問題的影響。最后對IEC推薦的平方檢測算法提出了改進措施，并進行了仿真驗證，結果表明改進后的平方檢測法在發(fā)生單相接地情況下能夠避免電壓波動與閃變產(chǎn)生的突變。 對于突變的、非平穩(wěn)的電壓閃變信號的檢測，本文探討了基于擬同步檢波與小波變換的電壓閃變檢測方法。通過仿真，驗證了小波變換應用于電壓波動與閃變檢測的可行性。小波多分辨率分析能夠準確檢測出電壓閃變分量的幅值、頻率等信息，并能夠準確地檢測出閃變發(fā)生和結束的時間。
[Abstract]:With the development of our economy and the improvement of science and technology, the demand for electric energy is increasing, and the load of electricity is nonlinear, asymmetric and fluctuating, and the proportion of fluctuating load is increasing. It poses a new threat to the power quality of the power grid. As an important indicator of power quality, voltage fluctuation and flicker have attracted more and more attention. This paper begins with the concept of voltage fluctuation and flicker, introduces its definition, standard and characteristic quantity of measuring voltage fluctuation and flicker, analyzes the source, harm and compensation measures of flicker. Then the principle and characteristics of the existing voltage fluctuation and flicker detection methods are briefly introduced and compared. Since the International Electrotechnical Commission (IEC) has published the design block diagram of the flicker instrument, this paper verifies the block diagram by using the simulation software and discusses the reasons for the error. In view of the phenomenon of voltage fluctuation and sudden change of flicker value found in the power quality test of a substation, the advantages and disadvantages of square detection method in the case of single-phase grounding are analyzed by using simulation software. The influence of voltage flicker is studied. In the end, the improved square detection algorithm recommended by IEC is proposed, and the simulation results show that the improved square detection method can avoid voltage fluctuation and flicker mutation in the case of single-phase grounding. For the detection of abrupt, non-stationary voltage flicker signals, a voltage flicker detection method based on quasi-synchronous detection and wavelet transform is discussed in this paper. The feasibility of applying wavelet transform to voltage fluctuation and flicker detection is verified by simulation. Wavelet Multiresolution Analysis can accurately detect the amplitude and frequency of the flicker component, and can accurately detect the occurrence and end time of the flicker.
【學位授予單位】：中國礦業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM73

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