Derive the dynamic modelling of a wind power generation system equipped with a doubly-fed induction generator and variable speed wind turbine equipped with variable pitch control
Derive the dynamic modelling of a wind power generation system equipped with a doubly-fed induction generator and variable speed wind turbine equipped with variable pitch control.
Nowadays, doubly fed induction generators (DFIG) based wind turbines (DFIG-WT) are one of the most used wind power generation systems due to the cost-effective provision of variable speed operation. DFIG-WT depends on the control system applied at both generator and turbine levels via a cascaded structure with an inner fast loop for power regulation of DFIG and an outer relative slow loop for speed control of the wind turbine. Wind turbine also utilizes pitch angle control to adjust the output power for wind speed above the rated speed.
Task 1 (50%) Derive the dynamic modelling of a wind power generation system equipped with a doubly-fed induction generator and variable speed wind turbine equipped with variable pitch control. The wind turbine should be modelled via a two-mass model. The model of DFIG should include both stator and rotor differential dynamics, the control of the rotor side and grid side converter. Briefly explain the control functionalities of the DFIG and the WT, such as vector control of active power and reactive power of the DFIG, pitch angle control of the WT, the grid-side converter control, and maximum power point tracking control via the speed control loop of the DFIG-WT.
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