分布式光伏发电系统的谐波分析
发布时间：2018-11-16 18:52
【摘要】：各项技术的日臻纯熟使得太阳能、沼气等多种清洁能源大范围的深入居民的生产生活。首先本文详细的介绍并研究了分布式太阳能、沼气等绿色能源的发展背景以及谐波分析的发展现状,针对不同发电电源的特点对比其谐波产生的可能性。针对国际光伏发电电能质量谐波的标准,对国内外的谐波研究比较总结出如今依旧待解决的方向。分布式电源的发电方式不尽相同,但大多需要使用逆变器将直流电与交流电进行转换。由于本分布式光伏发电系统自身具有的不定因素使得其本身可能携带大量谐波,如此将分布式电源的发电质量及其电能利用大打折扣。本文选择分布式光伏发电系统作为研究对象,就其发电过程产生的谐波特点进行分析,对光伏发电系统的光伏电池组做了数学模型和建模仿真,验证了光照强度等影响因素下光伏电池的特性曲线。通过分析对比谐波的多种分析方法以及算法,以传统的傅里叶分析方法入手就分布式光伏系统发电特征针对分布式光伏发电系统进行了研究。本文在同步采集和非同步采集不同状态下的信号特点基于传统傅立叶方法,针对频谱泄漏和栅栏效应对谐波的影响特点,利用Hamming窗、Hanning窗、4项3阶Nuttall窗的旁瓣值、主瓣值、旁瓣衰减速度等窗函数的拦截特性对应选择最适合的窗函数进行分析修正,抑制频率泄漏和增加信号的精确性。另外提出了卷积窗改进算法且具体介绍了谐波分析的流程,然后仿真比对并验证,对其它窗函数而言该算法在微弱谐波幅值检测及简化计算量上的优越性,最后针对发电系统中常存在的间谐波进行了常用窗函数的对比仿真分析,有效提升了分布式光伏发电系统中谐波分析的精准性,对该系统现实应用意义极大。
[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.
【学位授予单位】：沈阳农业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM615
，
本文编号：2336346
[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.
【学位授予单位】：沈阳农业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM615
，
本文编号：2336346
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