双馈风力发电机空载并网优化控制仿真分析

An Optimization Control Simulation Analysis for Doubly-Fed Induction Generator No-Load Grid-Connection

变速恒频双馈电机发电是一种全新高效发电方式,适用于风力发电等可再生能源开发利用。为了解决双馈电机使用机械式传感器测量转速带来的转角偏差问题,提出采用模型参考自适应的方法在并网前空载励磁阶段辨识转子的实际速度,并将估算转速反馈到矢量控制系统。在MATLAB/Simulink环境下,建立采用S函数的双馈电机的空载仿真模型。仿真结果表明,模型参考自适应法可以比较准确的辨识电机转速,增强空载并网系统的稳定性,提高电能质量,验证了改进方法的正确性。

Variable - Speed Constant - Frequency （VSCF） is a new efficient method for generating electric power. It is adaptable to the development of the renewable energy such as wind power. In order to solve the problems caused by using the mechanical sensors measuring the speed of DFIG, a model reference adaptive method was pro- posed to identify the actual rotor speed and feedback the estimated speed to the vector control system, Then S - function based model in the Matlab/Simulink was built up. Results indicate that model reference adaptive method can identify motor speed accurately and improve the stability of the no - load grid - connection system and power quality, which verifies the correctness of this method.