When the wind power system is connected to the grid on a large scale, it will face very complicated working conditions. In order to guarantee the healthy grid operation of the new energy system, during the product iteration of "R&D-Production-Testing" in the industry, the R&D and testing engineers have to repeatedly modify the parameters of the controllers and the parameters of the filters in order to carry out the testing of the wind turbines under a series of different working conditions. Based on the semi-physical simulation to support the construction of any topology model and the characteristics of a high degree of accuracy, the use of hardware-in-the-loop for the testing of wind turbines to be connected to the grid has already become a mainstream trend nowadays.

For large-scale grid connections, photovoltaic inverters face immensely complex working conditions. To ensure the normal grid-connected operation of renewable energy generating systems, in the industry's product iteration process, during the actual "R&D—production—testing" steps, R&D and test engineers must make repeated attempts to change control parameters, filter parameters and perform a series of inverter performance tests under varying conditions. Based on the characteristics of hardware-in-the-loop simulation, which supports the construction of arbitrary topology models and is highly accurate, the use of hardware-in-the-loop for photovoltaic grid-connection testing has become the mainstream trend.