【摘要】：各項技術(shù)的日臻純熟使得太陽能、沼氣等多種清潔能源大范圍的深入居民的生產(chǎn)生活。首先本文詳細(xì)的介紹并研究了分布式太陽能、沼氣等綠色能源的發(fā)展背景以及諧波分析的發(fā)展現(xiàn)狀,針對不同發(fā)電電源的特點對比其諧波產(chǎn)生的可能性。針對國際光伏發(fā)電電能質(zhì)量諧波的標(biāo)準(zhǔn),對國內(nèi)外的諧波研究比較總結(jié)出如今依舊待解決的方向。分布式電源的發(fā)電方式不盡相同,但大多需要使用逆變器將直流電與交流電進(jìn)行轉(zhuǎn)換。由于本分布式光伏發(fā)電系統(tǒng)自身具有的不定因素使得其本身可能攜帶大量諧波,如此將分布式電源的發(fā)電質(zhì)量及其電能利用大打折扣。本文選擇分布式光伏發(fā)電系統(tǒng)作為研究對象,就其發(fā)電過程產(chǎn)生的諧波特點進(jìn)行分析,對光伏發(fā)電系統(tǒng)的光伏電池組做了數(shù)學(xué)模型和建模仿真,驗證了光照強(qiáng)度等影響因素下光伏電池的特性曲線。通過分析對比諧波的多種分析方法以及算法,以傳統(tǒng)的傅里葉分析方法入手就分布式光伏系統(tǒng)發(fā)電特征針對分布式光伏發(fā)電系統(tǒng)進(jìn)行了研究。本文在同步采集和非同步采集不同狀態(tài)下的信號特點基于傳統(tǒng)傅立葉方法,針對頻譜泄漏和柵欄效應(yīng)對諧波的影響特點,利用Hamming窗、Hanning窗、4項3階Nuttall窗的旁瓣值、主瓣值、旁瓣衰減速度等窗函數(shù)的攔截特性對應(yīng)選擇最適合的窗函數(shù)進(jìn)行分析修正,抑制頻率泄漏和增加信號的精確性。另外提出了卷積窗改進(jìn)算法且具體介紹了諧波分析的流程,然后仿真比對并驗證,對其它窗函數(shù)而言該算法在微弱諧波幅值檢測及簡化計算量上的優(yōu)越性,最后針對發(fā)電系統(tǒng)中常存在的間諧波進(jìn)行了常用窗函數(shù)的對比仿真分析,有效提升了分布式光伏發(fā)電系統(tǒng)中諧波分析的精準(zhǔn)性,對該系統(tǒng)現(xiàn)實應(yīng)用意義極大。
[Abstract]:With the development of various technologies, solar energy, biogas and other clean energy are widely used in the production and life of residents. Firstly, this paper introduces and studies the development background of distributed solar energy, biogas and other green energy sources and the development status of harmonic analysis, and contrasts the possibility of harmonic generation according to the characteristics of different power sources. According to the international standard of harmonics in photovoltaic power generation, the harmonic research at home and abroad is compared and summarized the direction that remains to be solved. Distributed generation methods are different, but most of them need inverters to convert DC to AC. Due to the uncertain factors of the distributed photovoltaic system itself, it may carry a large number of harmonics, so the quality of the distributed photovoltaic power generation and its power utilization will be greatly reduced. In this paper, the distributed photovoltaic system is chosen as the research object, and the characteristics of harmonics generated by the system are analyzed, and the photovoltaic battery pack of the photovoltaic system is modeled and simulated. The characteristic curves of photovoltaic cells under the influence of light intensity and other factors were verified. Based on the analysis and comparison of various harmonic analysis methods and algorithms, the characteristics of distributed photovoltaic system (DPV) are studied based on the traditional Fourier analysis method. In this paper, the characteristics of signals in different states of synchronous acquisition and asynchronous acquisition are based on the traditional Fourier method. According to the influence of spectrum leakage and fence effect on harmonics, the sidelobe value and main lobe value of Hamming window, Hanning window and four third-order Nuttall windows are used. The intercepting characteristics of the sidebar attenuation velocity equal-window function can be analyzed and corrected by selecting the most suitable window function to suppress frequency leakage and increase the accuracy of the signal. In addition, an improved convolution window algorithm is proposed and the flow of harmonic analysis is introduced in detail. Then the simulation results are compared and verified. For other window functions, this algorithm is superior to other window functions in detecting the amplitude of weak harmonics and simplifying calculation. At last, the common window function is compared and analyzed to improve the accuracy of harmonic analysis in distributed photovoltaic power generation system, which is of great significance to the practical application of the system.
【學(xué)位授予單位】：沈陽農(nóng)業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM615
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本文編號：2336346