Split源光伏并网逆变器控制策略研究  

Research on control strategy for photovoltaic grid-connected Splitsource inverters

作　　者：郭龙[1] 田立欣[1] 刘广忱[1] GUO Long;TIAN Lixin;LIU Guangchen(Inner Mongolia University of Technology,Huhhot Inner Mongolia 010080,China)

机构地区：[1]内蒙古工业大学,内蒙古呼和浩特010080

出　　处：《电源技术》2021年第9期1164-1167,1222,共5页Chinese Journal of Power Sources

基　　金：国家自然科学基金(51867020)。

摘　　要：用于存储可再生能源的并网电源转换系统需满足低成本,高效率和复杂度等要求。使用传统的并网逆变器时,通常需要在前级加入一个升压变换电路,从而造成了两级结构。单级并网逆变器只用一级能量变换就可实现DC-AC并网逆变功能,因此在体积、成本、质量和复杂度等方面均优于两级结构。基于上述分析,研究了Split源逆变器(SSI),作为阻抗网络型逆变器的替代选择。分析了SSI的工作原理,建立了平均状态模型。在此基础上,使用了一种改进的调制策略,结合同步旋转坐标系控制技术,实现了并网模式下SSI的解耦控制。利用Matlab/Simulink搭建的模型进行了仿真实验,结果验证了理论分析的正确性和实用性。The grid-connected power conversion systems for storing renewable energy sources needs to meet several requirements,such as low cost,high deficiency and complexity.When the traditional grid-connected inverter is used,a boost converter circuit is added to the front stage,resulting in a two-stage structure.The single-stage grid-connected inverter can realize the grid-connected DC-AC inverter function with only single-stage energy transformation,so it is superior to the two-stage structure in terms of volume,cost,weight and complexity.On the basis,the Split-source inverter was studied as an alternative to impedance network inverter.The working principle of SSI was analyzed,and the average space state model was built.On this basis,an improved modulation strategy was used,and combined with synchronous rotation coordinate system control technology,the decoupled control scheme of the SSI in grid-connected mode was achieved.The model built by Matlab/Simulink was used for simulation.The experimental results verify the correctness and practicability of the theoretical analysis.

关 键 词：并网 单级 Split源逆变器 空间矢量 解耦控制 

分 类 号：TM615[电气工程—电力系统及自动化]