This paper studies torque control problems for variable-speed wind turbines subject to denial-of-service (DoS) attacks. First, a novel dual-channel dynamic event-triggering scheme is designed to reduce the frequency of communications between nacelle cabinets and tower bases. Two event triggers act on the information transmission channels from the nacelle cabinet side to the tower base side and from the tower base side to the nacelle cabinet side, respectively. Two event-triggered schemes possess different triggering conditions and operate independently. Furthermore, to resist DoS attacks in wind turbine systems, an estimator is introduced on the controller side to estimate the lost data during DoS attacks and an estimator-based control strategy is designed. Some simulations on a Co-Simulation System Test Bench (CS-STB) illustrate that the proposed control strategy can effectively mitigate the impact of DoS attacks and guarantee the optimal rotor speed tracking performance for wind turbine systems.