Abstract : To explore an effective control strategy for a brushless dual-frequency generator (BDFM) wind power system with variable speed constant frequency (VSCr) control, this paper analyzes the structural characteristics and working principle of BDFM, presents a control method for VSCF power generation mode, constructs a mathematical model of the motor's dq coordinate coefficients under rotor speed constraints, and derives the power control strategy for the variable speed constant frequency operation mode. Based on the mathematical model of BDFM and the power control strategy, a main circuit topology with bidirectional frequency converters on both the motor and grid sides is designed, realizing the four-quadrant smooth operation of the wind turbine and the power control strategy of VSCF. Simulation experiments were conducted on the VSCF operation mode of the BDFM power generation system. Simulation results verify that the proposed control strategy can achieve variable speed constant frequency power generation, with a response time of 0.2s from no-load start-up to 1050 r/min, and can effectively control both active and reactive power. Keywords: Brushless double-fed generator; Wind power generation; Variable speed constant frequency (VSCF); Control strategy; Simulation 1 Introduction In recent years, resource scarcity and environmental degradation have led countries worldwide to prioritize the development and utilization of renewable and pollution-free new energy sources. Wind power generation is a typical example of renewable energy utilization. Among various wind power generation systems, the VSCF system can achieve maximum efficiency when the output power is lower than the rated power, thus replacing the constant speed constant frequency system as the mainstream of wind power generation worldwide. The brushless double-fed generator (BDFM) described in this paper significantly reduces the operation and maintenance costs of the generator system due to the absence of rotor slip rings and brushes. With appropriate control strategies, VSCF power generation can be achieved, and it possesses the advantages of AC excitation power generation systems, making it a major trend in future wind power generation. Based on the structural analysis and VSCF principle of the BDFM, this paper establishes a fully decoupled mathematical model of the BDFM in the rotor speed d-q coordinate system through coordinate transformation, presents a power control method for VSCF, and conducts simulation research. Simulation results verify that the BDFM (Double-Fed Dynamic Power Generation) system can achieve variable-speed constant-frequency power generation and decoupling control of active and reactive power, thus realizing optimized power generation efficiency control. [b][align=center]For details, please click: Control Strategy and Implementation of Brushless Doubly-Fed Wind Turbines[/align][/b]