新颖的三相Boost型光伏并网逆变器

发布时间：2018-02-09 00:54

本文关键词： 光伏逆变器 Boost型三相分区SPWM控制中心抽头储能电感　出处：《中国电机工程学报》2017年08期 　论文类型：期刊论文

【摘要】：提出一种新颖的三相Boost型光伏并网逆变器,并对其拓扑、双环改进型分区SPWM控制策略、低频模态、储能开关关断电压尖峰抑制、高频开关过程、光伏电池最大功率点跟踪(maximum power point tracking,MPPT)、关键电路参数设计准则等进行了深入的分析研究,获得了重要结论。其拓扑是由输入滤波电容、中心抽头储能电感、三相逆变桥、三相输出滤波器级联构成,且在储能电感中心抽头与输入源负端间接有储能开关;其控制策略是对三相电网电压进行60°分区,以确保每个开关周期均满足Boost型变换器的工作机理。设计并研制了3kW 96VDC/380V 50Hz 3φAC逆变器,实验结果表明,这类逆变器具有升压比大、功率密度高、变换效率高、储能电感和输出滤波器小、并网电流质量高等优良性能,在单级三相低压并网逆变场合具有重要应用前景。
[Abstract]:A novel three-phase Boost photovoltaic grid-connected inverter is proposed, and its topology, dual-loop modified SPWM control strategy, low-frequency mode, switching off voltage peak suppression and high-frequency switching process are discussed. In this paper, the maximum power point tracking principle and the design criterion of key circuit parameters for photovoltaic cell are analyzed and studied in depth, and some important conclusions are obtained. The topology is composed of input filter capacitance, center tap energy storage inductor, three-phase inverter bridge, etc. The three-phase output filter is composed of cascaded three-phase output filters, and there is an indirect energy storage switch between the center tap of the energy storage inductor and the negative end of the input source, and the control strategy is to divide the voltage of the three-phase power network by 60 掳. The 3kW 96VDC / 380V50Hz 3 蠁 AC inverter is designed and developed to ensure that each switching cycle meets the working principle of the Boost converter. The experimental results show that the inverter has a high boost ratio, a high power density and a high conversion efficiency. The energy storage inductance and output filter are small and the quality of grid-connected current is high. It has important application prospect in single-stage three-phase low-voltage grid-connected inverter.
【作者单位】：福建省新能源发电与电能变换重点实验室(福州大学);
【基金】：国家自然科学基金重点项目(51537001)~~
【分类号】：TM464;TM615

【参考文献】