基于三端口模块级联型固态变压器的分布式太阳电池组的最大功率输出跟踪控制研究

RESEARCH ON MPPT CONTROL METHOD FOR DISTRIBUTED SOLAR CELLS BASED ON THREE-PORT MODULAR CASCADED SOLID-STATE TRANSORMER

研究通过一种三端口模块级联型固态变压器,将太阳电池组直接接入微电网,并提出一种改进的控制策略;该控制策略不仅使模块级联型固态变压器运行时具有网侧单位功率因数、能量双向传输、各级联模块均衡传输功率等原有功能,同时,无需专用的控制器,还可实现分布式太阳电池组实时输出最大功率以及就近消纳功能。实验验证该控制策略的先进性与可行性。

Solid State Transformer(SST)is one of the key facilities in the future smart grid and has attracted more and more attention of researchers recently because of the function of energy router. Through three-port modular cascaded SST,solar cells are directly linked to micro grid,and an improved control strategy is presented in the paper. The proposed scheme can not only guarantee unity power factor regulation capability in the grid side,ensure energy’s balance and bi-directional transmission,but also maximize the power output of photovoltaic energy and realize real-time nearest consumptive function without special control units. The experimental results have verified the advancement and reliability of the proposed control strategy.