超级电容储能直驱永磁风电机的高电压穿越控制策略

High voltage ride through control strategy of direct drive permanent magnet wind motor with super capacitor energy storage

为提高直驱永磁风电机的高电压穿越能力,考虑直驱永磁风电机稳态运行时的功率平衡条件与高电压穿越期间功率流向,提出一种含超级电容储能的高电压穿越控制策略,通过控制超级电容吸收直流侧多余能量,稳定直流侧母线电压,改进网侧逆变器的控制策略使其优先输出感性无功,补偿高电压穿越期间电网所缺失的无功。结果表明,高电压穿越期间直流母线电压骤升幅度降低了4.6%,显著提高系统高电压穿越能力。

This paper intends to improve the high voltage crossing capability of direct drive permanent magnet wind motor and proposes a high voltage crossing control strategy with super capacitor energy storage by considering the power balance condition and power flow during the high voltage crossing.The study involves stabilizing the bus voltage at DC side by controlling the super capacitor to absorb the excess energy of DC side;improving the control strategy of the inverter on the network side to give priority to the output of inductive reactive power to support the grid reactive power during the failure.The results show a 4.6%decrease in the voltage surge amplitude of DC bus during high voltage crossing,effectively improving the system high voltage crossing capability.