Abstract : The requirements of the power grid for directly grid-connected megawatt-level wind farms have evolved from power quality to transient stability, automatic recovery after accidents, frequency and voltage regulation, and direct dispatch. Therefore, doubly-infeed asynchronous wind turbines, with their stable power output and high adjustability, are gradually becoming the mainstream wind turbines. Due to the use of field-oriented vector transformation control technology, doubly-infeed asynchronous generators achieve decoupling control of active and reactive power by adjusting the voltage and current components of the PWM frequency converter used for excitation. Therefore, a detailed model of the doubly-infeed wind turbine was established, a corresponding control strategy was formulated, and the small-disturbance stability of the doubly-infeed wind turbine was analyzed and evaluated using the small-signal method and dynamic simulation. Keywords : doubly-infeed motor; grid-connected wind farm; small-signal stability; P-Q decoupling control 0 Introduction In the past 20 years, developed countries have made great achievements in the field of wind power technology. The single-unit capacity of grid-connected wind turbines has evolved from tens of kilowatts to megawatts; control methods have progressed from basic fixed-pitch stall control to all-blade variable-pitch and variable-speed constant-frequency control, with intelligent wind turbines expected to be launched in the coming years; operational reliability has increased from 50% in the early 1980s to over 98%, and all wind turbines operating in wind farms can achieve centralized and remote control. Due to the high controllability required for real-time wind farms, variable-speed constant-frequency wind turbines will become the mainstream type of large-scale grid-connected wind turbines. Currently, variable-speed generators mainly use DFIG (Doubly Infeed Induction Generator) asynchronous generators. DHG-based variable-speed constant-frequency wind turbines offer high controllability: at low wind speeds, they can maintain the optimal tip speed ratio to obtain maximum wind energy according to wind speed changes; at high wind speeds, they utilize changes in rotor speed to store or release some energy, improving the flexibility of the transmission system and making power output more stable. This paper establishes a detailed dynamic model of a grid-connected doubly-fed induction generator (DFIG) wind turbine. Through small-signal analysis, it assesses the stability of the system under small disturbances, analyzes possible oscillation modes and their mechanisms, studies its control methods and principles, and analyzes and verifies the model through dynamic simulation of a grid-connected DFIG wind turbine. [b][align=center]For more details, please click: Small-Signal Stability Analysis and Control Research of DFIG Wind Turbines[/align][/b]