【摘要】 随着风电渗透率的不断提高，风机的低电压穿越行为影响着电网的安全稳定运行，保证发生故障时风机不切机具有重要的现实意义。建立直驱永磁风机并网数学模型，推导直驱风机低压穿越过程中电压、电流及功率等相关电气量的解析表达式并提出一种新的无功补偿方案，该方案增加了发出无功，有利于系统电压的恢复，最后运用MATLAB仿真验证了理论研究的正确性以及无功补偿新方案的有效性。更多还原

【Abstract】 With the continuous increase of wind power penetration,the low voltage ride-through behavior of the wind fan affects the safe and stable operation of power grid,making it of practical significance to ensure that the fan remains connected during faults without tripping. The grid-connected mathematical model of direct drive permanent magnet fan is set up,and the analytical expressions of voltage,current,power and other related electrical quantities in the low-voltage ride-through process of direct drive fan are derived. A new reactive power compensation scheme is proposed,which increases the reactive power generation and is beneficial to the recovery of system voltage. Finally,MATLAB simulation is used to verify the correctness of theoretical research and effectiveness of the new reactive power compensation scheme.更多还原