Quantitative Comparison and Analysis of Different Power Routing Methods for Single-Phase Cascaded H-Bridge Photovoltaic Grid-Connected Inverter
Quantitative Comparison and Analysis of Different Power Routing Methods for Single-Phase Cascaded H-Bridge Photovoltaic Grid-Connected Inverter
复制标题
单相级联H桥光伏并网逆变器不同功率走线方式的定量比较与分析
DOI：
10.1109/tpel.2020.3024282
复制
发表时间：
2021
影响因子：
6.7
通讯作者：
R. Cao
中科院分区：
文献类型：
--
作者：
Siwei Yang;Xing Zhang;W. Mao;Yuhua Hu;Mingda Wang;Fusheng Wang;R. Cao
在单相级联H桥光伏并网逆变器中，由于辐照强度、环境温度和光伏组件老化程度的影响，各光伏组件的输出功率不同。当光伏组件运行在各自的最大功率点时，由于功率分配不均匀，相应的H桥单元的直流侧电压漂移，这将导致最大功率点跟踪失败。结果，电网电流将恶化，甚至系统将变得不稳定。基于基波电压重构、三次谐波注入和混合脉宽调制的功率路径控制方法可以实现H桥之间的功率不均等分配，保证系统稳定运行。本文总结了上述典型的功率路由控制方法，推导了不同方法的功率路由范围表达式，并对各种方法的功率路由能力进行了全面深入的定性和定量比较。单相七电平CHB光伏并网逆变器的仿真结果验证了理论分析的正确性。
The output power of each photovoltaic (PV) module is different in the single-phase cascaded H-bridge (CHB) PV grid-connected inverter due to irradiance intensity, ambient temperature, and aging degree of PV modules. When the PV modules are operating at their respective maximum power points, the corresponding dc-side voltages of the H-bridge units drift due to uneven power distribution, which will cause the maximum power point tracking failure. As a result, the grid current will deteriorate and even the system will become unstable. The power routing control methods based on fundamental voltage reconstruction, third harmonic injection and hybrid pulse width modulation can realize unequal power distribution between H-bridges to ensure the system stable operation. This article summarizes the abovementioned typical power routing control methods, derives the expressions of power routing ranges of different methods, then comprehensively and deeply compares the power routing capabilities of various methods qualitatively and quantitatively. The simulation results of a single-phase seven-level CHB PV grid-connected inverter demonstrate the validity of the theoretical analyses.