双反激式微逆变器系统的控制策略与设计.pdf

第41卷第 11期 中国测试 Vol.41 No.11 2015年 11月 CHINA MEASUREMENT TEST November，2015 doi院10.11857/j.issn.1674-5124.2015.11.017 双反激式微逆变器系统的控制策略与设计 刘正平袁 李伟凯袁 程帅鹏 （华东交通大学机电工程学院，江西 南昌 330013） 摘 要院针对单级反激式光伏并网微逆变器开关损耗大以及容易产生高频电压尖峰的问题袁研究双级反激式有源钳位 变换器遥采用有源钳位电路袁使逆变器在吸收漏感磁能的同时实现零电压开通遥为减小输出电流纹波袁双反激管通过正 弦脉宽调制实现交错导通工作模式曰并根据双反激变化器负载可能出现不平衡袁建立微逆变系统等效数学模型和等效 电路袁推导硬件设计参数和计算公式遥 最后通过软件仿真与样机实验的对比袁验证双反激式逆变器控制原理和元器件 设计选择的正确性遥 关键词院光伏并网曰交错反激曰有源钳位曰数学建模 文献标志码院A 文章编号院1674-5124渊2015冤11-0073-05 Control strategy and design of grid-connected microinverter based on interleaved flyback structure LIU Zhengping，LI Weikai，CHENG Shuaipeng （School of Mechatronics Engineering，East China Jiaotong University，Nanchang 330013，China） Abstract: An interleaved flyback active clamp converter has been developed to solve the large switching loss and high-frequency voltage spike of single-stage flyback grid-connected microinverters. This converter can absorb leakage magnetic and realize zero-voltage switching at the same time. The working mode of interleaved conduction was achieved through pulse width modulation to lessen output current ripples. As the load of the converter may be unbalanced，an equivalent mathematical model and equivalent circuit for microinverter system are established to deduce the design parameters and calculation formula of hardware circuit. In the end，the control principle and components of the interleaved flyback active clamp converter were verified correct by comparing software emulation with prototype experiment. Keywords: photovoltaic grid-connected；interleaved flyb