Predictive Control of Grid-Connected Modified-CHB With Reserve Batteries in Photovoltaic Application Under Asymmetric Operating Condition
Predictive Control of Grid-Connected Modified-CHB With Reserve Batteries in Photovoltaic Application Under Asymmetric Operating Condition
复制标题
非对称运行条件下光伏应用中备用电池并网改进型CHB的预测控制
DOI：
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
M. Liserre
中科院分区：
文献类型：
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作者：
M. Salehi;Masoud Shahabadini;H. Iman‐Eini;M. Liserre
在基于级联H桥(CHB)的光伏系统中，系统的稳定性和向电网注入最大有功功率是最重要的技术问题之一，特别是当连接到CHB电池的光伏阵列的辐照不均匀时。换言之，光伏阵列的不均匀辐照导致H桥单元的输出功率不平衡，从而导致CHB逆变器中的过调制和电网电流总谐波失真增加。常规控制方法不能保证并网CHB逆变器在非对称运行条件下的稳定性。因此，本文提出了一种新的带备用电池的CHB结构和一种新的调制技术，以稳定严重失配条件下的系统，避免过调制。此外，与传统的储能PV-CHB系统相比，开关和串联电池的数量减少，输出电压电平的数量增加。通过在MATLAB/SIMULINK中的仿真验证了该方案的有效性，并给出了实验结果，验证了理论和仿真结果。
The system stability and injection of maximum active power to the grid are among the most important technical issues in cascaded H-bridge (CHB) based photovoltaic (PV) systems, especially when the irradiation of PV arrays connected to CHB cells are not uniform. In other words, the unequal irradiation of PV arrays leads to the unbalanced output power of H-bridge cells, which causes overmodulation and increased grid current total harmonic distortion in the CHB inverter. Conventional control methods cannot maintain the stability of a grid-connected CHB inverter under asymmetric operating conditions. So, this article proposes a new CHB-based structure with reserve batteries and a novel modulation technique to stabilize the system in heavy mismatching conditions and avoid overmodulation. Furthermore, the number of switches and series batteries is reduced, and the number of output voltage levels is increased compared to the conventional PV-CHB system with energy storage. The validity of the proposed solution is verified by simulation in MATLAB/Simulink, and then the experimental results are presented to confirm the theoretical and simulation results.