风力发电系统建模与最优功率跟踪控制

Modeling for Wind Power Generation System and Optimal Power Tracking Control

风速的随机性、间歇性及不确定性,必将导致风电场的输出功率也具有随机波动性和间歇性,风电系统的输出功率影响电网的安全稳定运行和电能质量.通过构建了以鼠笼式感应电机为发电系统的定速变桨距风力发电系统,展开功率跟踪控制系统分析.给出了风力机空气动力学特性和建模方法,建立了传动链数学模型和感应发电机的数学模型.设计了转矩控制环、速度控制环,给出了实现功率跟踪的功率控制环设计思路,仿真结果表明,该系统能实现风电系统的最优功率跟踪控制.

Fluctuation, intermittence and uncertainty are the characteristics of wind energy which cause wind energy output power fluctuation and influence the grid stability and power quality. The wind power genera- tion system was constructed based on squirrel-cage induction generator （SCIG） , the mathematical model of aero- dynamics system was analyzed, and the mathematical model of drive train and squirrel-cage induction generator （SCIG） was created. The torque control loop and speed control loop were designed and power control loop de- signed with PI controller, and the simulation result shows this control system can realize optimal control for wind energy conversion system.