【作者】 叶益青；

【导师】 肖岚；

【作者基本信息】 南京航空航天大学 ， 电力电子与电力传动， 2005， 硕士

【摘要】 近年来,由于能源紧缺、环境污染和集中式供电存在种种缺陷,人们越来越重视可再生能源与分布式能源的发展,而逆变器系统是分布式能源中的重要组成部分。并网/独立双模式运行逆变器由于具有较好的经济性,能够不间断的为负载提供电能等优点,成为了研究的热点。 本文首先提出了一种基于电流滞环控制的双降压式半桥逆变器(Dual Buck Inverter-DBI),该逆变器主电路简洁可靠,可以实现功率开关管和续流二极管的最优设计。分析了逆变器在电压电流双环控制与电流单环控制两种模式下的运行情况,并将电压电流双环控制应用于逆变器的独立运行模式,将电流单环控制应用于逆变器并网运行模式,分别对两种模式的稳态工作情况进行了分析。为了实现逆变器不间断地向负载提供电能,实现系统的高可靠性,本文分析了逆变器在电压电流双环控制与电流单环控制两种模式之间的切换过程,讨论了不同切换方法的优缺点以及解决方法,提出了一种逆变器的无缝切换方法。 本文将上述方案应用于并网/独立双模式运行逆变器中,完成了一台 500VA的样机,采用数字控制芯片 DSP 来实现对逆变器并网/脱网过程的控制逻辑,并给出了实验结果。更多还原

【Abstract】 The developments of renewable energy and distributed power generation have been attracted more and more attentions because of the lack of energy, pollution and shortage of concentrative power generation. The inverter system is an important part of distributed power generation. Grid-connection and stand-alone two operation mode inverter which has the merits of flexibility, high reliability and economy has been thought much of. A dual buck inverter (DBI) based on hysteresis current control is proposed, which has concise main circuit configuration, freedom from shoot-though problems and capacity to realize the optimum design of all power devises. The operation principle of DBI in voltage mode and current mode are analysed. The voltage controlled inverter is applied to stand-alone mode and the current controlled inverter is applied to grid-connection mode. To improve the reliability of inverter, the switching process between stand-alone and grid-connection is analysised and compare the merits or shortages of different methods. Some solutions are proposed and a kind of control algorithm for seamless transfer of DBI between stand-alone and grid-connection mode is presented. The scheme is adopted to design a dual mode inverter. A 500VA prototype converter is built to verify the effectiveness of the control algorithm, and the experimental results are also included in this paper.更多还原