一种多逆变器太阳能光伏并网发电系统的组群控制方法

对光伏发电系统中的光伏阵列一逆变器对进行轮循分组控制，在逆变器输入功率小于设定的下限阈值时，部分光伏阵列并联后连接到一台逆变器输出；在并联开关分合闸过程中，一直保持光伏阵列以最大功率不问断输出；并且该方法对光照突变情况进行自适应判断，作为控制的预启动条件。此方法的优点是：能够同时提高逆变器和光伏阵列的转换效率，改善电能质量，降低并联开关和逆变器的动作次数，延长设备使用寿命，并且控制过程系统输出功率平稳。

A Group Control Method for Multi-Inverter Solar Grid-Connected PV Generation SystemsFANG Ting, HAN Yu, ZHANG Lan

A group control method is proposed for multi-inverter solar grid-connected PV systems in this paper. Round robin switching control is carried out in PV array-inverter pairs of PV power generation systems. Some PV arrays are parallelled and connected to a single inverter when the input power of corresponding inverters are less than the minimum threshold set. Non-stop maximum power output are achieved for PV systems during the parallel switching process. Adaptive judgment to the irradiance intensity chop is implemented as the pre-start conditions of switching control. Merits of the method are increasing conversion efficiency of PV systems, improving power quality, reducing parallel switching times, extending equipment life, and keeping the output power a smooth process.