LAUSR

Several small photovoltaic (PV) grid-connected inverters (GCIs) connected to a single PV array are applied in parallel in large-capacity applications since the power generation efficiency can be improved through appropriate control strategies. The control problem for parallel inverters is challenging due to DC voltage regulation and power sharing issues. This brief considers the problem of finite-time consensus of power sharing for parallel PV GCIs with a novel leader-follower structure. A primary droop controller at the DC side and a secondary finite-time controller are introduced in each follower to achieve power sharing with fast regulation and strong disturbance rejection. The test results for five 100 kW GCIs are presented to demonstrate the performance of the method.