基于DSP控制的单相逆变电源的研究

发布时间：2018-05-11 11:56

本文选题：逆变 + SPWM　；参考：《昆明理工大学》2014年硕士论文

【摘要】：科学技术日新月异的今天,电力电子技术也在不断创新,随着高性能低成本数字处理器的问世,传统的模拟电路逐渐被数字电路取代。在逆变电源领域,传统的模拟控制器已经暴露了它固有缺陷,而数字控制器不仅能弥补它的缺陷且更容易实现先进的控制技术。因此,逆变电源数字化已成为当前逆变领域的发展趋势。由于400Hz中频电源在军事和民航领域的市场需求在不断增大,因此,高质量、高性能的400Hz中频逆变电源成为电源领域研究的又一个热点。本文采用了高性能的数字处理器TMS320F28335作为主控制器,并在此基础上对单相400Hz中频逆变电源进行研究与实现。首先,本文讨论了单相逆变电源的工作原理,针对其调制方式选择了SPWM调制中的单极性、双极性和单极倍频进行对比分析,最终选择了单极性倍频SPWM调制方式。通过对比分析对称规则采样法和不对称规则采样法,并对这两方法产生的SPWM脉宽进行了定量计算,综合考虑后选择不对称规则采样法来实现数字化SPWM。在单极性倍频调制下系统开关频率在原来基础上可以提高一倍,使得逆变电源输出的脉动电压频率提高一倍,有利于减小输出滤波器的体积,增强滤波效果,同时也减小了系统谐波含量,提高输出电能的质量。不对称规则采样法不仅可以使得系统采样频率增加一倍,提高了系统的控制精度而且可以消除偶次谐波,很好的改善输出波形的质量。然后,本文在逆变电源数字控制技术上采用电压、电流瞬时值双闭环反馈与数字PID相结合,并对其进行相关的数学建模,给出相关传递函数并对其进行分析。PID实现数字化后对其积分项进行分离改进使其更符合本系统的实际需求,并推导出数字PID相关参数整定的方法。通过对这种控制技术的分析可以得出：电压、电流双闭环反馈PID控制技术可以提高逆变电源系统动态特性,减小稳态误差,提高输出波形的质量。最后,本文根据上述方案完成了整个400Hz逆变系统的硬件设计,并对硬件设计中相关的重要参数进行理论上的推算,并不断在实验中微调校准。同时也完成了整个系统的软件设计,针对SPWM的软件实现作了具体的阐述。通过对实验调试中得到的相关波形和数据的分析,表明本系统设计是合理可靠的,且输出波形的质量得到很好的改善。
[Abstract]:With the rapid development of science and technology, power electronics technology is constantly innovating. With the advent of high performance and low cost digital processors, traditional analog circuits are gradually replaced by digital circuits. In the field of inverter power supply, the traditional analog controller has exposed its inherent defects, but the digital controller can not only make up for its defects, but also realize the advanced control technology more easily. Therefore, the digitization of inverter power supply has become the current trend of development in the field of inverter. Due to the increasing market demand of 400Hz intermediate frequency power supply in the military and civil aviation fields, the high quality and high performance 400Hz intermediate frequency inverter power supply has become another hot spot in the field of power supply. In this paper, the high performance digital processor (TMS320F28335) is used as the main controller, and on this basis, the single-phase 400Hz if inverter is studied and implemented. Firstly, the working principle of single-phase inverter power supply is discussed. Unipolarity, bipolarity and unipolar frequency doubling in SPWM modulation are selected for its modulation mode. Finally, unipolar frequency doubling SPWM modulation mode is chosen. The symmetrical regular sampling method and the asymmetric regular sampling method are compared, and the SPWM pulse width produced by these two methods is calculated quantitatively. After considering the asymmetric regular sampling method, the digitized SPWM is realized. Under unipolar frequency doubling modulation, the switching frequency of the system can be doubled on the original basis, and the pulsating voltage frequency of the inverter power output can be doubled, which is helpful to reduce the volume of the output filter and enhance the filtering effect. At the same time, it also reduces the harmonic content of the system and improves the quality of the output power. The asymmetric regular sampling method can not only double the sampling frequency of the system, but also improve the control accuracy of the system, eliminate even harmonics, and improve the quality of the output waveform. Then, this paper combines voltage and current double closed loop feedback with digital PID in the digital control technology of inverter power supply, and carries on the related mathematical modeling to it. The correlation transfer function is given and analyzed. Pid is digitized and the integral term is separated and improved to meet the actual needs of the system. The method of setting the relevant parameters of digital PID is deduced. Through the analysis of this control technology, it can be concluded that the voltage and current double closed-loop feedback PID control technology can improve the dynamic characteristics of the inverter power supply system, reduce the steady-state error and improve the quality of the output waveform. Finally, according to the above scheme, the hardware design of the whole 400Hz inverter system is completed, and the related important parameters in the hardware design are calculated theoretically, and calibrated continuously in the experiment. At the same time, the software design of the whole system is completed, and the software implementation of SPWM is expounded. The analysis of the relevant waveforms and data obtained in the experiment and debugging shows that the design of the system is reasonable and reliable, and the quality of the output waveforms has been improved very well.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM464

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