【作者】 刘慧文；

【导师】 苏建徽；

【作者基本信息】 合肥工业大学 ， 电力电子与电力传动， 2003， 硕士

【摘要】 正弦逆变电源是将直流电转换成交流电的一种功率转换装置，在工业和民用方面具有广阔的市场。本文介绍了一种全数字化的正弦逆变电源，它具有通用性、可编程、可组合及智能化等特点。 论文从逆变电路的基本拓扑结构和工作原理入手，对系统的硬件构成、参数选择、控制方案及软件实现等问题进行了分析和讨论，在其基础上成功研制了三台5KW单相正弦逆变电源样机，并实现了三台样机的组合自同步控制运行。 本文提出了一种用于三台单相逆变器自同步运行的控制方法，即由三台独立的单相逆变器进行组合自同步，实现三相对称交流输出，此系统可以避免三相不平衡负载对逆变器输出电压的影响。整个系统由逆变子系统和监控子系统两个部分组成，含有键盘监控及液晶显示，具有多种故障自诊断功能，其可编程设计适用于多种场合。实验证明，该电路能够很好的解决逆变器带三相不平衡负载的问题。本系统的液晶显示设计为中文菜单操作方式，具有滚屏、反显等多种显示功能，接口界面友好。系统通讯采用RS-485标准总线接口，以双串口单片机W77E58作为主控芯片，通过液晶显示及上位机来监视系统运行的各项参数。 本文还对样机的性能进行了分析，结合当前逆变领域的发展趋势，指出了从样机到产品尚待提高和完善的地方。更多还原

【Abstract】 As an equipment of DC to AC power conversion, sine inverter takes on the broad market in both industry and folk applications. In the paper, a whole digital sine inverter is introduced, which is universal, programmable, intelligentized, and combinable.At the beginning, the basic topology and working theory of the inverting circuit is introduced. Following, the paper analyses and discusses the issues of hardware composing, parameter choice, controlling methods, and software implementing in the system. Finally, three 5KW sine inverters have been developed successfully and the auto-synchronous operation of the three single-phase inverters is implemented.A new controlling method to the auto-synchronous operation of the three single-phase inverters is issued in the paper, that is, three independent single-phase inverters can implement three-phase symmetrical AC output by being connected with each other, which can avoid the effect to the output of the inverter because of the asymmetric load. The system is composed of inverting subsystem and monitoring subsystem, which has the functions of keyboard monitoring and LCD display. Many kinds of faults auto-examining functions are provided in the system also, and its programmable design is adapted to many occasions. It is proved by experimenting that the circuit can solve the problem of three-phase asymmetric load effectively. The LCD display is designed as the mode of Chinese menu, which has the friendly interface and the functions of scrolling display and reverse display, etc. Using the MCU W77E58 as the key chip which has the dual serial ports, the standard RS-485 interface is used in the communication of the system. Meanwhile, all the parameters of the system state can be monitoring by LCD display and the computer.The paper also analyses the performance of the sample, furthermore, according as the developing trend of the inverting field, it reveals the improving and perfecting direction of the transformation from the sample to the product.更多还原