  This chapter provides an introduction to the modeling and control of power
generation from wind turbine systems. In modeling, the focus is on the
electrical components: electrical machine (e.g. permanent-magnet synchronous
generators), back-to-back converter (consisting of machine-side and grid-side
converter sharing a common DC-link), mains filters and ideal (balanced) power
grid. The aerodynamics and the torque generation of the wind turbine are
explained in simplified terms using a so-called power coefficient. The overall
control system is considered. In particular, the phase-locked loop system for
grid-side voltage orientation, the nonlinear speed control system for the
generator (and turbine), and the non-minimum phase DC-link voltage control
system are discussed in detail; based on a brief derivation of the underlying
machine-side and grid-side current control systems. With the help of the power
balance of the wind turbine, the operation management and the control of the
power flow are explained. Concluding simulation results illustrate the overall
system behavior of a controlled wind turbine with a permanent-magnet
synchronous generator.
