Research on the HIL Platform of Photovoltaic Grid Connected System

In order to analysis the characteristics of grid connected photovoltaic system, this paper proposes a Hardware-in-Loop (HIL) real time testing platform based on RT-LAB. The main circuit real time model is built in the RT-LAB, then connect the real time model with a DSP digital controller to achieve the double closed-loop control. And the HIL platform is used to analysis the low voltage ride through (LVRT) technology of grid connected photovoltaic under the of situation power grid fault. The experimental results validate the effectiveness and correctness of the model and the LVRT control strategy.