The method of grid disturbance test for very large capacity photovoltaic inverter based on hardware-in-loop simulation platform

With the increase of photovoltaic inverter's single machine capacity, the current power grid disturbance test platform has been unable to meet the detection requirements of very large capacity products. In this paper, a method of grid disturbance test for very large capacity photovoltaic inverter based on hardware-in-loop simulation platform is proposed. At present, very large capacity photovoltaic inverters are designed in parallel with multiple units. Firstly, the grid disturbance test data of a single unit is obtained through the grid disturbance test platform. Secondly, the control system of a single unit is connected with the HIL platform, and the unit model and test device model are established in the simulation platform according to the detailed topology structure and device parameters of a single unit. Thirdly, the model parameters in the simulation platform are adjusted to make the test data and type test data in the model consistent. Finally, in the simulation platform, the full power model of the product is established according to the actual parallel structure of the product, and various tests are carried out. The results show that the test method can accurately reflect the grid-connection performance of the product under the condition of grid disturbance.