【作者】 潘高强；

【导师】 王正； 张凤阁；

【作者基本信息】 沈阳工业大学 ， 电力电子与电力传动， 2010， 硕士

【摘要】 随着电力电子技术进一步发展,PWM逆变器在各种电力电子装置中得到了广泛的应用。在高效节能的同时,谐波污染问题也日益严重。为了减小谐波污染和进一步节能降耗,已经提出了各种PWM控制技术来抑制谐波。本文在对PWM电压型逆变器进行谐波分析的基础上,对特定谐波消除技术进行了深入研究。首先,根据PWM技术的基本原理与傅里叶级数理论,建立了正弦PWM逆变器和随机PWM逆变器输出电压波形的数学模型,并通过仿真对其数学模型进行谐波分析,得出其输出电压波形的谐波分布规律,为研究特定消谐技术提供了理论依据。其次,根据特定消谐技术的基本原理,建立了特定消谐逆变器输出波形的数学模型。该数学模型为非线性超越方程组,在分析牛顿迭代法求解的基础上,提出了同伦算法,它具有在大范围内快速收敛和对迭代初值要求低等特性。求解过程是先用同伦算法对非线性超越方程组进行求解,再用牛顿迭代法求得精确解。通过与牛顿迭代法的比较,该算法具有计算速度快、收敛域宽、计算精度高等优点。再次,通过分析开关角的分布规律和在硬件实现时所存在的问题,提出了省略开关角对和省略窄脉冲的优化策略。在不影响输出波形质量的前提下,以达到便于工程实现、减小功率开关管损耗、消除低次谐波的目的。最后,对双极性的特定消谐逆变器进行仿真,对其电压波形及其频谱图进行了分析,验证了理论分析的正确性。根据上述研究制作了基于STC89C52RC单片机的硬件控制电路,编制了程序软件。通过对实验结果的分析,验证了采用同伦算法和牛顿迭代法相结合的新算法进行逆变器消谐模型的求解,具有收敛范围宽、收敛速度快等显著优点。更多还原

【Abstract】 With the further development of power electronics technology, PWM inverter has been widely used in a variety of power electronic devices. In efficient and energy-saving, at the same time, harmonic pollution problem has become increasingly serious. In order to reduce the harmonic pollution and further saving energy, have proposed a variety of PWM control techniques to suppress harmonics. In this paper, based on harmonic analysis for PWM voltage source inverter, studies on selective harmonic elimination technology.First, according to the basic principles of PWM technology and Fourier series theory, mathematical models of output voltage waveform for the sinusoidal PWM inverter and random PWM inverter have built,and has carried out harmonic analysis by simulation of its mathematical model, reached its harmonic distribution of the output voltage waveform, provided a theoretical basis for the study of selective harmonic elimination technology.Secondly, according to the fundamental principles of selective harmonic elimination technology, the mathematical model of output voltage waveform for selective harmonic elimination inverter has built. The mathematical model is nonlinear transcendental equations, based on analysis of Newton iteration method, proposed homotopy algorithm, which has fast convergence in a large area and low demand characteristics for the iterative initial value. Solving process is the first to use non-linear homotopy algorithms for solving transcendental equations, and then obtain exact solutions by Newton iterative method.And by comparison with Newton iterative method, this algorithm have calculation speed, convergence wide-field and high precision calculation et al.Again, by analyzing distribution of switching angle for selective harmonic elimination technology and the extent of the problem of hardware implementation, proposed the optimization strategy, include a switch angle and a narrow pulse are omitted. Without affecting the quality of the output voltage waveform,in order to achieve purpose for easy engineering implementation, reducing power switch loss and elimination of low-harmonic. Finally, the bipolar inverter for selective harmonic elimination have simulated, its output voltage waveform and its spectrogram was analyzed to verify the theoretical analysis is correct. According to these studies has produced a hardware control circuit based on STC89C52RC and compiled software. Through the analysis of experimental results to verify significant advantages, include convergence range and fast convergence speed, the model of harmonic elimination inverter has solved by the use of the new algorithm for combining the homotopy algorithm and Newton iterative method.更多还原