Differential current of wind turbine generator set

How does the pitch angle controller work in a wind turbine?

The wind speed increases in increments of 2 [m/s], starting from 5 [m/s]. For wind speeds <12 m/s, the pitch angle controller does not operate because the pitch angle is zero for the considered wind turbine. The power controller controls the real power component to extract the maximum possible power.

Why do wind generators need a robust controller?

However, the dynamic characteristics of such generators depend on nonlinear parameters, such as stator flux, stator current, and rotor current, which increase overall system complexity. Therefore, robust controllers must be implemented with the ability to support the dynamic frequencies of wind energy to ensure system stability.

What are DFIG parameters under turbulent wind speed?

Fig. 13 presents the DFIG parameters under turbulent wind speeds, where the mean wind speed is 10 m/s and the turbulence intensity is 20%. The active power changes when the wind speed is <10 m/s but it is maintained at the rated value when the wind speed increases beyond the rated value. Generator performance with continuous wind speed variation

What are the dynamic characteristics of DFIG generators?

The dynamic features of DFIGs make it important to focus on designing high-performance control schemes. However, the dynamic characteristics of such generators depend on nonlinear parameters, such as stator flux, stator current, and rotor current, which increase overall system complexity.

What is a doubly-fed induction generator (DFIG)?

Doubly-fed induction generators (DFIGs) have been widely used for both grid-connected and standalone wind energy conversion systems (WECSs).

How rotor D axis current is controlled?

From zero stator voltage, the rotor d -axis current is controlled in order to build up the stator voltage in a short time. Meanwhile, the phase shift between the two voltages is compensated as shown in Fig. 14b. To demonstrate the superiority of state feedback over the PI controller, the synchronisation process is performed as shown in Fig. 15.