Study of power system simulator based on the double DQ transformation

In order to test photovoltaic inverter´s LVRT performance, it is needed to design big power grid simulator. In this paper, with Tl´s floating-point DSC TMS320F28335 as processor core, dual- 3-phase bridge parallel converter system is built. Grid simulator is composed of controlled rectifier and inverter. In order to achieve an asymmetric form voltage drop, the paper handle set voltages and sampled voltage by double DO decomposition, and get the positive and negative sequence voltage. This article added 100Hz notch in the decomposition process, and achieve the given voltage and negative feedback voltage sequence separation.