The global increase in demand for sustainable energy has led to rapid expansion in wind power, with a growing focus on ever higher wind turbines. However, installing these structures in seismically active areas raises new engineering challenges, particularly in terms of structural safety and design optimization considering complex dynamic loads. In this context, this study proposes an innovative passive control system, the Hinge-Spring-Friction Device (HSFD), designed to effectively mitigate wind and earthquake-induced stresses in onshore horizontal axis wind turbines (HAWTs). The HSFD, installed at the base of the tower, consists of a series of devices connected in parallel. The device was designed using a non-linear multi-objective optimization methodology, which considers the reduction of the moment at the base and the displacement at the top of the tower as performance indicators. To this end, the NREL 5-MW turbine, widely recognized in scientific literature, was adopted as a case study and modelled using a FEM environment developed in Simulink®. The numerical analysis examined real combined loads, consisting of ordinary wind actions and seismic actions compatible with the design spectrum defined according to the NTC2018 standard. The preliminary results show that the HSFD system is able to reduce the maximum moment at the base of the tower by an average of 35% compared to the configuration without the device. In addition, the device contributes to faster dissipation of post-seismic vibrations, suggesting potential benefits in terms of the fatigue life of the structure. The work is an innovative contribution to seismic engineering applied to renewable energy, providing a practical, replicable approach that can be easily integrated into the design process of modern wind turbines.