Broadband Oscillation Suppression Method for New Energy Grid-connected Systems Based on Parameter Optimization Strategy of Additional Damping Controller

A large number of power electron devices involved in the new energy grid-connected system are easy to cause problems such as broadband oscillation, which brings certain risks to the safe operation of the power grid. At present, on the issue of broadband oscillation suppression, the parameter setting schemes of direct-drive permanent magnet wind turbine (D-PMSG) machine / grid side controller (GSC / MSC) and flexible direct current transmission (VSC-HVDC) send / receive controller (SEC / REC) need to be further studied. This paper first analyzes the oscillation mode caused by the new energy access system based on the characteristic root method, and then designs the additional damping controller and uses its parameters as the optimization variable, and uses the coupled oscillation mode as the improvement goal to construct the overall optimization model of the controller parameters. After that, the improved simulated plant algorithm (I-PGSA) based on cloud model theory is used to solve the optimal additional controller parameters. At the same time, in order to prevent the target from shifting during the optimization process, mode tracking technology is introduced to ensure the rationality of the optimization. Finally, the optimization effect of the control parameters is compared through eigenvalue analysis, and the effectiveness of the proposed strategy is verified based on PSCAD / EMTDC emulation.