光伏阵列系统级分布式功率优化控制研究

Research on photovoltaic array system-level distributed power optimization control

在光照不均匀的工况下,光伏阵列的输出功率会受到很大影响,采用分布式MPPT控制可取得较好的效果,但关于系统级分布式功率优化的研究较少。本文考虑到系统的保护和安全、在对光伏组串中各光伏模块进行限压保护及直流母线采取卸荷保护的基础上,详细分析了分布式功率优化控制的工作机理和算法的实现过程,并利用仿真对算法进行验证以及和集中式MPPT控制进行比较,结果证明分布式MPPT优化控制不仅可以更好地提高光伏组串的发电量,而且可以保证系统安全可靠运行。

Under non-uniform insolation conditions,the output power of the PV array will be greatly affected. Better results can be achieved with distributed MPPT control,but the research about the system-level power optimization is rare. Considering the protection and safety of the systems and based on limiting voltage protection for each PV module of the PV strings and taking unloading protection for DC bus,the paper analyses the working mechanisms of the distributed power optimization control and the algorithm implementation process,and uses the simulation to verify this algorithm and compares with centralized MPPT control,and draws a conclusion that the distributed MPPT optimization control can better improve the generating capacity of PV strings and ensure the safe and reliable operation of the system.