双馈式风电机组的自适应Super-twisting功率控制

针对使用双馈式感应发电机的风电机组易受电网电压波动、外界风速干扰影响等问题,提出了一种自适应Super-twisting功率控制方法。该方法实现了风电系统随着系统工作的区域(由风速大小所决定)而变化,即在部分负荷区域优化有功功率,在全负荷区域限制有功功率。同时在不同的区域根据需要调节无功功率达到补偿功率因数的控制目标。该方法具有易于实现、鲁棒性强的优点和自适应控制增益可调的特点,适用于带有外界干扰以及参数时变的非线性系统。通过仿真证明,以该方法设计的控制器应用于双馈式风力发电系统中控制有功功率和无功功率具有良好的鲁棒性能,且抖振得到降低,滑模变量在有限时间内迅速收敛于滑模面。

Power regulation for wind turbine based on adaptive Super-twisting control

An adaptive Super-twisting control strategy is proposed to solve the problem that the wind turbine based on a doubly-fed induction generator (DFIG) is easy to be interfered with grid voltage fluctuation and external wind speed.The strategy realizes that control objectives vary with operation zones which depend on wind speed,that is,the active power is optimized in the partial load zone and the active power is limited in the full load zone.At the same time,the stator reactive power is adjusted according to the grid need to compensate the power factor in different regions.It has the advantages of easy implementation,strong robustness and adjustable gain of adaptive control,and is suitable for non-linear systems with external disturbances and time-varying parameters.The simulation results show that the controller designed by this strategy has good robustness in active power control and reactive power control in doubly-fed wind power generation system,the chattering is reduced and the sliding variables converge fast to the sliding manifolds in finite time.