Dynamic simulation of large wind farms integrated in a multimachine network

With the increased use of wind power, particularly in wind-farms, the voltage and frequency behaviors of the whole network are likely to be affected significantly. This paper presents simulation results calculated using a representative network containing wind power generations of up to 30%. Furthermore, modelling and simulation of different types of wind generators integrated into a multimachine power system are discussed. Special interest is focused on the doubly-fed induction machine, whose primary control structure comprises of decoupled active and reactive power control channels. The overall control scheme also includes power, speed and voltage control loops, which provide the reference values for active and reactive power. It is shown that with a simple extension of the control structure, wind generators can participate on the network frequency control and thus are able to reduce the adverse effects of the wind farms on the overall performance of the network.