發(fā)布時間：2018-10-11 13:40

【摘要】：隨著現(xiàn)代工業(yè)的快速發(fā)展，電力系統(tǒng)中非線性負載逐漸增加，諧波問題越來越復雜。如今，諧波污染已成為影響電力系統(tǒng)電能傳輸與分配的重要因素，其所帶來的問題主要包括繼電保護和自動裝置的誤動作、諧波損耗、絕緣老化和通訊干擾等。由于諧波可以引起上述各種危害，所以減少或消除諧波已成為電力系統(tǒng)中亟待解決的問題。而諧波檢測是諧波抑制的前提和基礎，因此諧波檢測在提高電能質量方面具有十分重要的意義。 針對電力系統(tǒng)中的諧波檢測問題，本文深入研究了二階廣義積分器-延時信號消去算法和級聯(lián)延時信號消去算法。二階廣義積分器-延時信號消去算法將SOGI濾波器、DSC方法和LPN-PLL相結合，適用于畸變和不對稱的三相系統(tǒng)，可以提取出基波正序分量。利用Matlab軟件對該檢測算法進行了仿真分析。 針對二階廣義積分器-延時信號消去算法只能檢測出基波正序分量，而不能檢測出任意次諧波的問題，，在DSC的基礎上應用了級聯(lián)延時信號消去算法。該算法可以檢測出任意次諧波的幅值和相角，并利用Matlab軟件進行了仿真分析。 本文設計了基于dSPACE實時仿真系統(tǒng)的實驗平臺來驗證上述兩種算法的有效性。該實驗平臺由兩部分組成，分別是dSPACE的單板系統(tǒng)DS1104和諧波源及非對稱三相系統(tǒng)實驗平臺。諧波源及非對稱三相系統(tǒng)實驗平臺是基于FPGA進行開發(fā)設計的，用于實現(xiàn)三相可編程信號源及與dSPACE系統(tǒng)之間的通訊。本文針對電網(wǎng)中可能發(fā)生的電壓跌落、三相不平衡以及諧波畸變故障設計了實驗案例，實驗結果表明這兩種算法均可以快速、準確地檢測出信號中的諧波。
[Abstract]:With the rapid development of modern industry, the nonlinear load in power system increases gradually, and the harmonic problem becomes more and more complex. Nowadays, harmonic pollution has become an important factor affecting the transmission and distribution of electric energy in power system. The main problems brought about by harmonic pollution include the maloperation of relay protection and automatic device, harmonic loss, insulation aging and communication interference. Since harmonics can cause the above kinds of hazards, reducing or eliminating harmonics has become an urgent problem in power system. Harmonic detection is the premise and foundation of harmonic suppression, so harmonic detection plays an important role in improving power quality. Aiming at harmonic detection in power system, the second order generalized integrator-delay signal elimination algorithm and cascade delay signal elimination algorithm are studied in this paper. The second order generalized integrator-delay signal elimination algorithm combines SOGI filter, DSC method and LPN-PLL. It is suitable for three phase systems with distortion and asymmetry, and can extract the positive sequence component of fundamental wave. The Matlab software is used to simulate the detection algorithm. In view of the problem that the second-order generalized integrator-delay signal elimination algorithm can only detect the positive sequence component of the fundamental wave but not any order harmonics, the cascaded delay signal elimination algorithm is applied on the basis of DSC. The algorithm can detect the amplitude and phase angle of any order harmonics, and the simulation analysis is carried out by Matlab software. An experimental platform based on dSPACE real-time simulation system is designed to verify the effectiveness of these two algorithms. The experimental platform consists of two parts: DS1104 harmonic wave source of dSPACE single board system and asymmetric three-phase system. The experimental platform of harmonic source and asymmetric three-phase system is developed based on FPGA, which is used to realize the communication between three-phase programmable signal source and dSPACE system. In this paper, an experimental case is designed for the possible voltage sag, three-phase imbalance and harmonic distortion faults in the power network. The experimental results show that the two algorithms can detect harmonics in the signal quickly and accurately.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM935

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