發(fā)布時(shí)間：2018-03-21 00:50

  本文選題：并聯(lián)型有源電力濾波器　切入點(diǎn)：諧波檢測(cè)　出處：《湘潭大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著工業(yè)進(jìn)步,各種電力電子設(shè)備廣泛投入使用,造成了越來越嚴(yán)重諧波污染的問題。有源電力濾波器(APF)這種新型的諧波抑制裝置憑著眾多無可比擬的優(yōu)勢(shì),成為了研究熱點(diǎn)。文本對(duì)并聯(lián)型有源電力濾波器(SAPF)的諧波檢測(cè)和補(bǔ)償控制策略兩個(gè)關(guān)鍵技術(shù)進(jìn)行深入研究。首先介紹了瞬時(shí)無功功率理論,以及基于該理論的p-q、ip-iq諧波檢測(cè)法,接著介紹了基于小波變換的諧波檢測(cè)法。在前面的研究基礎(chǔ)上提出了一種新在線諧波檢測(cè)方法,采用運(yùn)算速度快、結(jié)構(gòu)簡(jiǎn)單的提升小波變換,在對(duì)電流采樣信號(hào)序列提升小波分解之后采用新閾值函數(shù)對(duì)小波系數(shù)去噪處理,提高了去噪精度,重構(gòu)后的信號(hào)連續(xù)性好。同時(shí)通過對(duì)信號(hào)序列加滑動(dòng)時(shí)間窗的方式實(shí)現(xiàn)在線檢測(cè)功能,并且給出了實(shí)現(xiàn)上述在線、分解、閾值去噪、重構(gòu)等功能的S函數(shù)的算法流程。然后研究了目前補(bǔ)償控制策略中應(yīng)用最廣的三角波比較方式和滯環(huán)電流比較方式,運(yùn)用PI控制穩(wěn)定直流側(cè)電容電壓,并且在Matlab中仿真驗(yàn)證其效果。最后在Matlab/Simulink中搭建整體仿真模型,諧波檢測(cè)算法采用ip-iq法、小波分析法、提升小波分析法,補(bǔ)償跟蹤控制策略采用滯環(huán)電流比較方式跟蹤諧波電流,采用PI控制穩(wěn)定直流側(cè)電壓,仿真結(jié)果給出了采用三種諧波檢測(cè)算法及補(bǔ)償跟蹤控制策略補(bǔ)償后的電網(wǎng)電流波形圖及頻譜圖,仿真對(duì)比表明基于提升小波分析的在線諧波檢測(cè)法精度最高,性能最好。
[Abstract]:With the development of industry, a variety of power electronic equipment has been widely used, which has caused more and more serious harmonic pollution. Active Power filter (APF), a new type of harmonic suppression device, has many unparalleled advantages. In this paper, two key technologies of harmonic detection and compensation control strategy of shunt active power filter (SAPFF) are studied. Firstly, the instantaneous reactive power theory is introduced, and the p-qnip-iq harmonic detection method based on this theory is introduced. Then the harmonic detection method based on wavelet transform is introduced. Based on the previous research, a new on-line harmonic detection method is proposed. After lifting the wavelet decomposition to the current sampling signal sequence, the new threshold function is used to Denoise the wavelet coefficient, which improves the denoising accuracy. After reconstruction, the signal continuity is good. At the same time, the on-line detection function is realized by adding a sliding time window to the signal sequence, and the on-line detection, decomposition and threshold denoising are given. Then, the most widely used triangular wave comparison method and hysteresis current comparison method in the current compensation control strategy are studied, and Pi control is used to control the DC side capacitance voltage. Finally, the whole simulation model is built in Matlab/Simulink. The harmonic detection algorithm adopts ip-iq method, wavelet analysis method, lifting wavelet analysis method, compensation tracking control strategy using hysteresis current comparison method to track harmonic current. Pi is used to control steady DC side voltage. Three harmonic detection algorithms and compensation tracking control strategy are used to compensate the current waveform and frequency spectrum of the power network. The simulation results show that the on-line harmonic detection method based on lifting wavelet analysis has the highest accuracy and the best performance.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN713.8;TM761

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本文編號(hào)：1641537