Abstract: To address the intensified frequency fluctuations and delayed frequency regulation response during transient primary frequency modulation in power systems, this study investigates a collaborative control method for transient instantaneous power deviation in thermal power units. By establishing a transient analysis model based on rotor motion equations, the coupling mechanism between active power imbalance and frequency dynamics is elucidated. An adaptive frequency divider parameter correction strategy based on frequency change rate prediction is analyzed to achieve intelligent optimization of synchronous units" primary frequency regulation response. A variable power point tracking control strategy for renewable energy units is developed to harness their rotor kinetic energy potential during transient processes. Case studies demonstrate that the proposed method significantly improves system frequency minimum points, accelerates frequency recovery, and enhances transient frequency stability, providing effective technical support for the safe operation of next-generation power systems.
Keywords: thermal power unit; control strategy; primary frequency regulation; transient; instantaneous power;