全功率永磁直驱风电机组暂态稳定性研究

摘要

基于矢量解耦控制策略,建立了适用于电力系统暂态稳定分析的直驱风力发电机组在d-q轴坐标下暂态数学模型,其中包含了对直驱风电机组暂态性能有影响的传动链模型；搭建了发电机侧控制策略和网侧控制策略.利用MATLAB/Simulink软件搭建了包含传动链的并网型直驱风力发电机组的暂态仿真模型,对直驱风力发电机组进行暂态稳定性仿真.结果表明:当电网电压骤降时,实现了有功、无功解耦控制；当电网发生故障时,发电机转速、有功功率、无功功率和机端电压有一定的波动；直驱机组直流电压升高,因此风电机组需要对直驱风电机组电力电子元件的保护；当电网电压跌落时,直驱风电机组具有发出无功的能力,有利于故障时电网电压快速恢复,从而提高电力系统的安全和稳定性.%Based on the vector decoupling control strategy,the establishment of a suitable for power system transient stability analysis of direct drive wind power generation unit in d-q axis coordinates under transient mathematical model,including the direct drive wind power unit transient performance influential drive-train model.Built generator side control strategy and the network side control strategy.Using MATLAB/Simulink software built drive-train direct drive wind generating set transient simulation model of direct drive wind generating set,which contain drive-train model,for transient stability simulation.The result showed that:when power grid voltage dip,the active and reactive power decoupling control could be available; When a fault happens,the speed and active power,reactive power and voltage of the power generator have certain fluctuation; the unit dc voltage of Direct drive wind power generation rise,so the wind power unit need to direct drive wind generator power electronic component protection; When power grid voltage drop,the direct drive wind power unit has a reactive ability,be helpful for failure power grid voltage quick recovery,so as to improve power system security and stability.