基于模糊控制的带动态虚拟电阻DFIG的HVRT策略优化

HVRT optimization strategy of DFIG with dynamic shift virtual resistor based on fuzzy control

随着众多学者深入研究双馈风力发电机并网运行控制,电网电压对称骤升给风力发电机并网系统带来的危害不容小觑,尤其是因风机脱网带来的经济损失和变换器件损失也引起越来越多人的关注。为研究电网电压对称骤升的控制策略,建立了1.5 MW基于矢量控制方法的双馈风力发电机并网系统模型,并提出了一种带动态虚拟电阻的模糊控制器的控制策略,利用模糊控制器调整虚拟电阻达到动态效果,使其跟踪电流电压动态变化。理论上在电网电压骤升的情况下,该方法减小了转子电流和电压的冲击。此控制策略的有效性在Matlab/simulink仿真平台也得到了验证,对比发现,比原控制降低振荡幅度5%~10%左右。

With more and more researchers begin to deeply research on grid-connected doubly fed induction generator,it can＇t be neglected about the harm that grid voltage swells have caused to DFIG（ doubly fed induction generator） based wind turbines,especially financial loss and device damage. In order to study the control strategy of symmetrical grid voltage swells,a 1. 5 MW DFIG grid-connected model is established based on vector control method and a control strategy for fuzzy controller with dynamic-virtual-resistor is proposed,and the strategy adopts the fuzzy controller to adjust the virtual resistor dynamically,which makes it change with current and voltage. The strategy enervates the generator output voltage and current fluctuation under voltage swells in theoretically. A simulation results verify the efficiency of the proposed control strategy based on Matlab/simulink,and the strategy makes the dampening oscillation generally about 5%-10% more than before by contrast.