Modeling and performance assessment of PV plants based on field-test of power generation unit

PV power plants should meet technical requirements before connected to grid. Due to the equipment capacity and cost constraints, low voltage ride through (LVRT) of the plants can not be directly tested. In this paper, the methods to assess PV plants performance based on the field test of power generation unit (PGU) are introduced. At first, the way to test LVRT capability of PGU is put forwarded, and then modeling and model correction is developed with t DIgSILENT Power- Factory. After the correction of PGU model, the whole PV plants model is built, including a mount of inverters, transformers, PV arrays, cabbles and other key components. The LVRT performance of PV plants is evaluated by the simulation result.