基于DSP的逆变器并联的设计

发布时间：2018-07-23 10:21

【摘要】：在目前这个能源越来越匮乏的时代，新能源受到越来越大的重视，其中太阳能因其干净，不可穷尽的优点，尤其受到青睐。但如何有效的利用这种能源是一直以来困扰人类的问题，为此人们进行了大量的研究。随着电力电子技术的出现，此问题得到了解决。用电力电子器件组成的逆变器就是用来将太阳能转化为人类可利用能源的重要装置。它用光伏板采集太阳能，在用各种升压及逆变电路，滤波电路将其转为能利用的交流电。但是因为人类的用电设备不断增加，需要供电容量越来越大的设备来满足他们。而并联技术就能有效的解决此类问题，多个电源可以并联一起想设备供电，，每个电压un平均负担负载功率，而且，模块化的设计更加灵活，可以随时扩展或较少容量，使用灵活。可实现冗余供电，系统的可靠性大大的提高了。本文提出的逆变器并联控制策略在各并联模块间没有模拟连线，控制简单，环流抑制效果更好。首先，文章概述了太阳能光伏发电的背景及发展趋势及并联技术发展的必要性，逆变器并联控制技术的研究现状，介绍了几种主要的控制策略和其所存在的问题，提出了逆变并联系统的均流解决方案。其次，讨论了逆变电路的设计及对调制方式进行介绍，并分析了逆变并联的模型。接着讨论了逆变器的并联原理，并对环流产生的原理进行分析，用下垂法进行控制，这里我对原来的下垂法控制进行了创新，使用更灵活的改进下垂控制法。然后因为此系统的主控芯片是DSP，所以对这次用的DSP2821做了详细介绍。最后，用matlab仿真做出了结果，说明了理论想法可行。
[Abstract]:In this era of energy scarcity, new energy has been paid more and more attention, among which solar energy is especially favored for its clean and inexhaustible advantages. But how to use this kind of energy effectively is the problem which has been puzzling human beings all the time, people have carried on a lot of research for this reason. With the emergence of power electronics technology, this problem has been solved. The inverter composed of power electronic devices is an important device to convert solar energy into human available energy. It uses photovoltaic panels to collect solar energy and converts them into usable alternating current using various boost and inverter circuits. But because of the increasing number of human power devices, more and more power supply capacity is needed to meet them. Parallel technology can effectively solve such problems. Multiple power sources can be connected to each other to supply power to the equipment. Each voltage un is loaded with load power on average. Moreover, the modular design is more flexible and can be expanded at any time or with less capacity. Use flexibility. Redundant power supply can be realized, and the reliability of the system is greatly improved. The parallel control strategy proposed in this paper has no analog connection between the parallel modules, so the control is simple and the effect of loop suppression is better. Firstly, the paper summarizes the background and development trend of solar photovoltaic power generation, the necessity of parallel technology development, the research status of inverter parallel control technology, and introduces several main control strategies and their existing problems. The current sharing solution of the inverter parallel system is presented. Secondly, the design of inverter circuit and modulation mode are discussed, and the model of parallel inverter is analyzed. Then the parallel principle of inverter is discussed, and the principle of loop generation is analyzed, and the droop method is used to control it. Here, I innovate the original droop control method and use more flexible improved droop control method. Then, because the main control chip of this system is DSP, the DSP2821 used in this paper is introduced in detail. Finally, the matlab simulation results show that the theoretical idea is feasible.
【学位授予单位】：南昌航空大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM464

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