级联逆变器阶梯波合成积分差值控制的建模与仿真研究

发布时间：2018-05-08 00:43

本文选题：积分差值控算法 + 控制参数模型　；参考：《重庆大学》2014年硕士论文

【摘要】：级联式多电平逆变器在交、直流电力传输、大容量电机驱动等场合得到广泛使用。但在使用中存在着资源浪费的问题。级联逆变器的发展为适应节约资源和环境保护的发展要求，再度成为电力电子技术的研制热点。本文研究工作的当前目标，在于把2H桥级联逆变电路作为一个基础性研究平台，研究它在反馈闭环控制中如何控制各H桥的开关角，，以保证输出电压波形的质量；揭示反馈控制参数与开关角和谐波畸变率的关系。本文研究工作所采用的主要方法是仿真方法。通过仿真去验证控制参数的有效性和积分差值控制算法调制阶梯波的实用性。所用的其它方法在于：用数学方法建立控制参数模型，用对照的方法考察所得开关角度是否可用。本文研究的结果：1，创建了级联逆变器阶梯波合成的新的控算方法积分差值控算法，给出了合成阶梯波跟踪正弦波的积分差值的控制参数，以及这一参数的两种取值模型。2，揭示了积分差值控制参数与H桥开关管的开关角度的关系，进而揭示了它与输出多电平阶梯波电压中的谐波含量的关系。3，拓展了积分差值控算法合成阶梯波的研究范围，把积分差值控算法推广到PWM阶梯波合成上，即进行了阶梯波的EPWM控制研究和阶梯波单级SPWM控制研究。本文研究所得出的最终结论是：1，级联逆变器合成输出的阶梯波与参考正弦波存在积分差值，这一差值可以作为反馈闭环控制的控制参数。2，这一控制参数的表达式有两个数学模型。3，积分差值控制参数与开关管的开关角度是相联系的，也可以反映合成阶梯波电压中谐波含量，在生产实践中可根据具体情况选取这种控制参数值。4，积分差值控制算法合成平滑阶梯波，可用于PWM阶梯波调制，包括阶梯波EPWM调制和阶梯波单级SPWM调制。与此相应，积分差值控制方法也可以与PWM控制方法相组合，对混合级联逆变器实施混合控制。
[Abstract]:Cascaded multilevel inverter is widely used in AC, DC power transmission and large capacity motor drive. However, there is a problem of waste of resources in use. The development of cascaded inverter has become the research hotspot of power electronics technology in order to meet the requirements of resource saving and environmental protection. The aim of this paper is to take the 2H bridge cascade inverter circuit as a basic research platform, and to study how to control the switching angle of each H bridge in the feedback closed-loop control to ensure the quality of the output voltage waveform. The relationship between feedback control parameters and switching angle and harmonic distortion rate is revealed. The main method used in this paper is the simulation method. The effectiveness of the control parameters and the practicability of the integral difference control algorithm are verified by simulation. The other methods are to establish the control parameter model by mathematical method and to investigate whether the switch angle is available by contrast method. The result of this paper is: 1, a new control method for cascade inverter step wave synthesis is established, and the control parameters of the integral difference value of the synthetic step wave tracking sinusoidal wave are given. The relationship between the integral difference control parameter and the switching angle of the H-bridge switch tube is revealed. Furthermore, the relationship between the harmonic content in the output multilevel step wave voltage and the harmonic content in the output multilevel step wave voltage is revealed. The research scope of the integral difference control algorithm for the synthesis of the step wave is expanded, and the integral difference control algorithm is extended to the PWM step wave synthesis. The EPWM control of step wave and single stage SPWM control of step wave are studied. The final conclusion of this study is that there is an integral difference between the step wave and the reference sine wave of the cascade inverter. This difference value can be used as the control parameter of feedback closed-loop control. The expression of the control parameter has two mathematical models .3.The integral difference control parameter is related to the switch angle of the switch tube. It can also reflect the harmonic content in the synthetic step wave voltage. In production practice, the control parameter value. 4 can be selected according to the specific situation. The integral difference control algorithm can synthesize smooth step wave, which can be used for PWM step wave modulation. It includes step wave EPWM modulation and step wave single stage SPWM modulation. Accordingly, the integral differential control method can be combined with the PWM control method to implement hybrid control for hybrid cascaded inverter.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM464

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