【摘要】 介绍了异步风力发电机组软并网原理,分析了基于晶闸管进行软并网的控制过程。软并网系统由反并联晶闸管、控制电路及其保护电路组成,中央处理器采用Atme1 89C51单片机。当晶闸管两端施加反向电压时可以自然关断,通过调节晶闸管的导通角即可调节发电机定子电压。控制加在发电机定子上的电压按阶梯波的形式从某一较小的初值逐渐增加到全压状态,从而使风力发电机组并网电流控制在一定范围内,大幅降低并网时的冲击电流。根据S48/750风力发电机参数建立了Simulink仿真模型,对失速型异步风力发电机组的并网过程进行了仿真。所设计的系统在750 kW机组上做了软并网实验。仿真和实验结果表明,采用晶闸管软并网系统可以有效抑制冲击电流,使失速型异步风力发电机组平稳并网。更多还原

【Abstract】 The principle of soft cut-in technology for asynchronous wind generator is introduced and its thyristor-based control process is analyzed.The structure of soft cut-in system is composed of antiparallel thyristors,control circuit and protection circuit,and its CPU is Atme1 89C51 single-chip computer.Thyristor turns off automatically when negative voltage is exerted and the stator voltage is regulated by varying the turn-on angle,which is used to set the stator voltage in steps from a small initial value to the rated value for controlling the cut-in current in a certain range to greatly reduce the impact current.A Simulink model is established based on S48/750 wind turbine parameters and the soft cut-in process is simulated for the stall-regulated wind turbine generators.The soft cut-in experiment is performed on 750kW unit.Simulation and experimental results show that,the thyristor soft cut-in system effectively restrains the impact current and makes the cut-in of wind turbine asynchronous generator smooth.更多还原