前端调速型风电机组动力学建模与运行特性研究

Dynamic modeling and operation performance of wind turbine set based onits front-end speed regulating mechanism

基于先进的机械调速与伺服控制技术,提出了一种带有发电机前端无极调速器的混合传动风电机组方案,以实现变速恒频。利用集中质量与拉格朗日方法,建立该机组传动系统动力学模型。并利用动力学方程建立1.5 MW前端调速型风电机组的Simulink仿真,实现对机组调速精度、功率消耗、电流谐波与低电压穿越能力等运行特性的深入研究。结果表明:在不同的风速条件下,所提机组不仅可以在调速功率消耗较小的情况下输出恒频电能(占比小于输出功率的15.25%),还可以有效抑制电流谐波污染,改善机组低电压穿越能力。理论分析与仿真研究验证了该机组的实用性和优越性。

Based on advanced mechanical speed regulating and servo control techniques,a hybrid-drive wind turbine(WT)set with a generator front-end nonpolar speed regulator was proposed to realize its working mode of variable-speed constant-frequency(VSCF).The dynamic model for the WT’s transmission system was established using the lumped mass method and Lagrange’s equations.Based on the derived dynamic equations,The Simulink simulation model for a 1.5 MV WT set with front-end speed-regulating was built to deeply study its operation characteristics including speed-regulating accuracy,power consumption,current harmonic wave pollution and low-voltage ride-through(LVRT)capability.The results showed that under condition of different wind speeds,the proposed WT set can not only output constant-frequency electric power with smaller power dissipation(less than 15.25%of output power)of speed regulating,but also effectively suppress current harmonic wave pollution and improve the WT set’s LVRT capability;the practicability and superiority of the proposed WT set are verified with theoretical analysis and simulation study.