【作者】 章勇高； 高彦丽； 蔡少华；

【Author】 ZHANG Yong-gao;GAO Yan-li;CAI Shao-hua;School of Electrical and Electronic Engineering East China JiaoTong University Nanchang;

【机构】 华东交通大学电气与电子工程学院；

【摘要】 研究了一种仅需三个主开关器件的新型单相升降压微逆变器,分析并讨论了基本工作原理及其四种不同的工作状态。设计了微逆变器在电流断续模式下的脉冲能量调制(PEM)技术。详细讨论了三开关微逆变器的硬件电路,包括主电路、反激电感以及控制电路的设计,同时设计了微逆变器的软件处理系统,包括了过零信号捕获的时序设计、PWM信号的生成以及模数转换模块设计与配置。在此基础上,构建了一台400W的微逆变器实验平台,以验证该微逆变器和PEM调制方法的可行性和有效性。实验结果表明,新型升降压微逆变器可以高效的将能量从直流电源侧传送到交流电网侧,同时,在50-300V的宽范围直流输入电压条件下,系统仍能有效工作并向电网注入正弦输出电流。更多还原

【Abstract】 A novel Buck-Boost micro-inverter with three switching devices is proposed in this paper.The basic operating principle and four different operating modes are discussed.It presents a novel pulse energy modulation(PEM)method under discontinuous inductor current conduction mode are discussed in this paper.It also briefly illustrates the design of hardware,such as power main circuit,fly-back transformer,control circuit and the design of software,such as analog-to-digital converter,zero-crossing signals capturing and PWM signals generating.A 400 W experimental set-up of the novel micro-inverter system on grid is constructed to testify the validity of buck-boost micro-inverter and PEM modulation method.Experimental results conclude Buck-Boost micro-inverter can transfer the energy from DC power supply to AC grid efficiendy.It can provide sinusoidal output current under large range of DC input voltage.更多还原