考虑低穿特征的规模化光伏聚类分析方法

Clustering Analysis Method for Large-scale Photovoltaic with LVRT Characteristics

研究规模化光伏低电压穿越期间无功补偿等控制策略时,需要对暂态行为相似的光伏机组进行分群处理,以实现不同机组间的协调控制。首先归纳了规模化光伏在低穿期间的主流控制方式,指出光伏电站在故障期间有功电压耦合现象。考虑光伏与同步机暂态特性的差异性,提出一类考虑光伏低穿特征的聚类分析方法,该类方法克服了传统分群方法的静态局限,较好地反映了光伏暂态电压的集群现象,在等值系统和实际电网中验证了所提方法的有效性。

In the study of control strategies such as reactive power compensation during the low voltage ride through(LVRT)period of large-scale photovoltaic(PV),it is necessary to group the PV units with similar transient behavior to realize coordinated control among different units.First,the main control modes of large-scale PV during the LVRT peri⁃od are summarized,and the active voltage coupling phenomenon of a PV power generation station under fault is pointed out.With the consideration of the difference of transient characteristics between PV and synchronous generators,a kind of clustering analysis method taking into account the LVRT characteristics of PV is proposed,which overcomes the stat⁃ic limitation of traditional clustering methods and better reflects the cluster phenomenon of PV transient voltage.Final⁃ly,the effectiveness of the proposed method is verified in an equivalent system and a real power grid.