The demand for sustainable development and renewable energy has resulted in a growing integration of grid-tied systems of photovoltaic (PV). This resource typically runs in the mode of maximum power point trackers (MPPT) to maximize income. However, system operators will keep adding new regulations to guarantee grid stability and dependability, eventually compelling PV plants to follow primary frequency control. PV plants must be able to operate outside of the maximum power point and adjust their power output to maintain the reserve of active power in response to grid requests to fulfill this mission. A new algorithm of model-based (MB) tracking for the regulation of power networks is presented in this research. The algorithm can now change the curtailment of power based on the factor of reduction provided by the operators of the power system, thanks to the improved formulation. The new algorithm has outstanding performance and precision, as demonstrated by the results. It can regulate power between 10 and 100% of the maximum power available. Furthermore, an assessment has been conducted regarding the effects of utilizing constant reduction coefficients on algorithmic performance. Based on information acquired during a longer than month-long period of observation of six, validation has been carried out. This could serve as the foundation for PV systems’ engagement in frequency regulation because of its versatility.