【摘要】 目前针对电网故障的研究,主要集中在对称故障方面,研究的是不对称故障中的小值电网电压不平衡时风电机组的故障穿越技术.在传统电网电压定向的电压、电流双闭环控制基础上,应用变流器网侧和机侧功率平衡控制原理,将永磁同步发电机输出有功功率Ps变化的信息引入d轴控制回路,从而实现电网侧变流器输入至电网的有功功率能够及时跟踪永磁同步发电机输出有功功率的变化,从而解决了变流器输入输出的有功不平衡问题,避免了直流母线电压的波动.更多还原

【Abstract】 Now the research of wind turbine on the grid pauct mainly focuses on symmetrical fault.This essay mainly studies the wind turbine failure through technology in the small values of the grid voltage.On the basis of traditional grid voltage about directional voltage and current double closed loop,we use a new control strategy that is based on the principle of power balance.It puts the output active power changing information into d-axis control loop which is produced by the permanent magnet synchronous generator.Then it can let grid side converter into active grid with tracking the permanent magnet synchronous generator output active power changes.Accordingly it solves the converter input and output active imbalances and avoids the fluctuations in the DC bus voltage.更多还原