双馈风力发电机PWM变流器控制策略优化研究

摘要

为了提升脉冲宽度调制（Pulse Width Modulation，PWM）变流器在电网发生不平衡故障时的控制能力，对变流器控制策略进行优化，设计了基于电流平衡和基于功率平衡的功率外环控制策略，并在仿真实验系统中进行了模拟、分析与验证。结果表明：该方法能够更有效地实现对机组的控制，故障期间对直流电压纹波的抑制效果很好，可稳定控制直流电压，有效降低有功功率波动，提升电网稳定水平。%For the sake of improving control ability of pulse width modulation (PWM) converters when the power grid breaks down,optimizes control strategy of converter,separately designs power loop control strategies based on current balance and power balance,through modeling simulates control effects. The result shows that the method can effectively control the units with better effect of suppressing DC voltage ripple in period of failure,control DC voltage steadily,reduce active power fluctuation and improve stability level of power grid.