基于双重傅里叶级数的光伏逆变器多周期及混沌SPWM频谱计算方法研究
发布时间：2018-07-15 10:26
【摘要】：随着光伏发电产业的蓬勃发展,光伏逆变器带来的谐波及电磁干扰问题也越来越受到人们的关注,严重的电磁干扰和谐波不仅影响电力设备本身的正常运行,并网运行时还将对电网造成电磁污染。目前,屏蔽、滤波、接地等方法是抑制电磁干扰的主要措施。近年来,混沌PWM控制因其可以从源头上有效降低变换器的电磁干扰而得到越来越多的关注,但目前的研究方向主要集中在仿真和实验验证方面,缺乏理论分析,尤其是频谱量化分析方面。因此,本文根据混沌SPWM的研究现状,将研究重点放在了混沌控制降噪量化分析上,提出了一种基于双重傅里叶级数的多周期及混沌SPWM频谱计算方法。 本文首先介绍了光伏逆变器的研究背景及其面临的电磁干扰问题,然后,根据传统的频谱分析方法——双重傅里叶级数,对常规双极性SPWM进行了频谱计算,并对频谱分布特性进行了分析,指出了频谱在开关频率及其整数倍处存在较大谐波峰值的特点。 接着,证明了常规SPWM及多周期SPWM下输出电压的谐波总能量不变性。并在多周期SPWM输出波形数学建模的基础上,提出了多周期SPWM波的双重傅里叶级数频谱计算方法,得出了多周期SPWM的频谱量化表达式,将频谱计算结果与MATLAB仿真结果进行了对比验证。 在对多周期SPWM进行频谱计算分析的基础上,将上述多周期SPWM的频谱计算方法拓展应用到了混沌SPWM频谱计算中,分析了混沌SPWM频谱计算的可行性。为了验证不同混沌映射及不同载波周期波动范围对混沌SPWM输出波形频谱的影响,文中选择了常用的Tent和Chebyshev映射分别进行了频谱计算与结果对比,并从短期和长期两个方面阐述了混沌载波周期波动范围和混沌序列初值、概率密度对扩频效果的影响。 最后,在理论计算和仿真验证的基础上搭建了混沌SPWM控制光伏逆变器实验平台,进行了常规SPWM和混沌SPWM控制下的相关实验,对比分析了不同控制策略下SPWM输出电压和交流电流的频谱分布特征,与本文的频谱计算结果进行了比较,进一步验证了本文所提频谱计算方法的有效性。
[Abstract]:With the vigorous development of photovoltaic power generation industry, people pay more and more attention to the problem of harmonic and electromagnetic interference brought by photovoltaic inverter. Serious electromagnetic interference and harmonic not only affect the normal operation of power equipment itself. When connected to the grid, it will also cause electromagnetic pollution to the power grid. At present, shielding, filtering, grounding and other methods are the main measures to suppress electromagnetic interference. In recent years, more and more attention has been paid to the chaos PWM control because it can effectively reduce the electromagnetic interference of the converter from the source. However, the current research direction is mainly focused on simulation and experimental verification, lacking of theoretical analysis. Especially the spectrum quantization analysis. Therefore, according to the current research situation of chaotic SPWM, this paper focuses on the quantitative analysis of chaos control noise reduction, and proposes a multi-period and chaotic SPWM spectrum calculation method based on double Fourier series. In this paper, the research background of photovoltaic inverter and the electromagnetic interference are introduced. Then, the frequency spectrum of conventional bipolar SPWM is calculated according to the traditional spectrum analysis method-double Fourier series. The characteristics of spectrum distribution are analyzed, and the characteristics of large harmonic peak at switching frequency and integer times are pointed out. Then, the total harmonic energy invariance of the output voltage under conventional SPWM and multi-period SPWM is proved. On the basis of mathematical modeling of multi-period SPWM output waveform, a double Fourier series spectrum calculation method of multi-period SPWM wave is proposed, and the spectrum quantization expression of multi-period SPWM is obtained. The spectrum calculation results are compared with MATLAB simulation results. On the basis of spectrum calculation and analysis of multi-period SPWM, the spectrum calculation method of multi-period SPWM is extended to chaotic SPWM spectrum calculation, and the feasibility of chaotic SPWM spectrum calculation is analyzed. In order to verify the influence of different chaotic maps and different carrier cycle fluctuations on the spectrum of chaotic SPWM output waveforms, the common Tent and Chebyshev maps are selected to calculate the spectrum and compare the results. The effects of chaotic carrier cycle fluctuation range, initial value of chaotic sequence and probability density on spread spectrum effect are discussed in both short and long term. Finally, on the basis of theoretical calculation and simulation, the experimental platform of chaotic SPWM controlled photovoltaic inverter is built, and the related experiments under the control of conventional SPWM and chaotic SPWM are carried out. The spectrum distribution characteristics of the output voltage and AC current of SPWM under different control strategies are compared and compared with the results obtained in this paper. The validity of the proposed method is further verified.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM464
本文编号：2123764
[Abstract]:With the vigorous development of photovoltaic power generation industry, people pay more and more attention to the problem of harmonic and electromagnetic interference brought by photovoltaic inverter. Serious electromagnetic interference and harmonic not only affect the normal operation of power equipment itself. When connected to the grid, it will also cause electromagnetic pollution to the power grid. At present, shielding, filtering, grounding and other methods are the main measures to suppress electromagnetic interference. In recent years, more and more attention has been paid to the chaos PWM control because it can effectively reduce the electromagnetic interference of the converter from the source. However, the current research direction is mainly focused on simulation and experimental verification, lacking of theoretical analysis. Especially the spectrum quantization analysis. Therefore, according to the current research situation of chaotic SPWM, this paper focuses on the quantitative analysis of chaos control noise reduction, and proposes a multi-period and chaotic SPWM spectrum calculation method based on double Fourier series. In this paper, the research background of photovoltaic inverter and the electromagnetic interference are introduced. Then, the frequency spectrum of conventional bipolar SPWM is calculated according to the traditional spectrum analysis method-double Fourier series. The characteristics of spectrum distribution are analyzed, and the characteristics of large harmonic peak at switching frequency and integer times are pointed out. Then, the total harmonic energy invariance of the output voltage under conventional SPWM and multi-period SPWM is proved. On the basis of mathematical modeling of multi-period SPWM output waveform, a double Fourier series spectrum calculation method of multi-period SPWM wave is proposed, and the spectrum quantization expression of multi-period SPWM is obtained. The spectrum calculation results are compared with MATLAB simulation results. On the basis of spectrum calculation and analysis of multi-period SPWM, the spectrum calculation method of multi-period SPWM is extended to chaotic SPWM spectrum calculation, and the feasibility of chaotic SPWM spectrum calculation is analyzed. In order to verify the influence of different chaotic maps and different carrier cycle fluctuations on the spectrum of chaotic SPWM output waveforms, the common Tent and Chebyshev maps are selected to calculate the spectrum and compare the results. The effects of chaotic carrier cycle fluctuation range, initial value of chaotic sequence and probability density on spread spectrum effect are discussed in both short and long term. Finally, on the basis of theoretical calculation and simulation, the experimental platform of chaotic SPWM controlled photovoltaic inverter is built, and the related experiments under the control of conventional SPWM and chaotic SPWM are carried out. The spectrum distribution characteristics of the output voltage and AC current of SPWM under different control strategies are compared and compared with the results obtained in this paper. The validity of the proposed method is further verified.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM464
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