南京过程学院电力过程学院毕业设计（论文）.doc

摘要
由于传统能源的枯竭,各国对环境保护的重视以及现存的电力系统的种种弊端,分布式发电将在未来的供电系统中发挥越来越重要的的作用。近年来以燃料电池发电急速,微型燃气轮机发电技术,光伏电池发电技术和锋利发电技术为代表的新型分布式发电技术发展迅速。但是分布式发电技术发出的电都不是与电网供电系统相同的交流电,无法与大电网联网或者直接供给普通负载使用,都需要变频装置将其变换成负载可以使用的交流电或者与大电网电压、频率相匹配的工频交流电。因此,针对特定的分布式发电技术研究与其相配套的变频电源就很有必要。本文对内燃机拖动永磁发电机的中小功率分布式发电系统,设计一套变频电源,将发电机发出的中频交流电变换为相电压220V、频率50Hz的工频交流电。在论述和分析了变频电源及其控制技术发展的概况和趋势的基础上,结合课题任务的实际情况,设计了一套小功率的逆变电源。
系统中的PWM控制信号采用了专用集成芯片SA4828生成,减轻了控制器的工作量也提高了系统的可靠性。控制器选用继承了A/D转换器的单片机,使系统的硬件复杂性降低。本文介绍了系统的硬件电路和软件系统的设计过程,对设计的系统进行Matlab/Simulink的仿真。

关键词分布式发电,变频电源,电力电子,专用集成芯片
Abstract
Since the depletion of traditional energy sources, countries to environmental protection and the existing drawbacks of the power system, distributed power generation system in the future play an increasingly important role. Rapidly in recent years, the fuel cell power generation, micro gas turbine power generation technology, photovoltaic cell power generation technology and the sharp new technology as the representative of the rapid development of distributed generation technologies. However, given the power of distributed generation technologies are not the same with the AC power supply system, and can not directly supply a large power grid interconnection or use ordinary load,
Frequency devices need to be converted into alternating current, or load that can be used with large power grid voltage and frequency match the frequency alternating current. Therefore, for specific distributed generation technology and its matching variable frequency power to be necessary. This drag on the engine's small and medium-power permanent generator distributed generation systems, to design a power inverter, the generator frequency AC transform given phase voltage 220V, frequency 50Hz industrial frequency alternating current. Discussed and analyzed in the frequency power and control technology development conditions and trends, based on the subject of the task with the actual situationDesigned a low-power inverter. PWM control signals in