Design And Study Of Test Rig For Inertial Response Of Full-capacity Wind Turbine

In the electricity grid, the increasing penetration of variable speed wind turbines will lead to a reduction of connected conventional power plants. As the rotational speed of the wind turbine and the electricity grid are decoupled by power electronic converters, the wind turbine doesn't present its inertia towards the grid, thus the total rotational inertia of the grid is decreasing significantly. This will result in faster and larger frequency deviations after the power unbalance between generation and load. So it's important to make the variable speed wind turbine to present its inertial response characteristic whenever needed to maintain the stability of the power system during a transient situation. This thesis studies two kinds of inertia control strategies of wind turbines with full-capacity power converters. An inertial experimental platform for the full-capacity wind turbine is designed and accomplished, with what the feasibility of the presented control strategies is demonstrated.The basic structure and typical grid-connected control strategy of the full-capacity wind turbine are introduced firstly. GSC model is built, SCIG control model is analyzed, and two kinds of grid-connected control strategies are researched, i.e. GSC&MSC. The common inertial control strategies are analyzed and researched, i.e., the df/dt inertial control strategy and the inertial control strategy by optimizing PLL, which are respectively popular based the two kinds of grid-connected control strategies. Simulation model is built in MATLAB/Simulink. An inertial experimental platform for the full-capacity wind turbine is designed and accomplished, and experiment results demonstrate the feasibility and correctness of the presented control strategies.