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Wind power represents a growing proportion of generation capacity around the world. As wind power has increased, it has been important to accurately model the behaviour of wind turbines in order to understand their impact on the power system. This paper presents a model of a multi-megawatt induction machine wind turbine equipped with a full power converter. This model is implemented in Matlab-Simulink and is designed to be appropriate for power system studies whilst including representation of all major electrical, mechanical and aerodynamic subsystems. The increasing proportion of wind power in the power system has led to concern over frequency regulation and how wind plants will regulate active power. The model presented here is used to simulate both high and low frequency excursions and to demonstrate that wind turbines can be controlled to provide rapid response. Alternative approaches to providing system reserve, in the presence of a fluctuating resource, are discussed and consideration is given to the firmness of response and the level of the spilt wind.