基于ACPI的风力发电系统MPPT控制方法

Maximum power point tracking based on auto-coupling PI control for a wind power generation system

针对直驱永磁同步风力发电系统存在非线性、参数不确定性以及转矩扰动等问题,研究了一种基于自耦PI控制理论的最大功率跟踪控制方法。该方法以转速跟踪为目标,将发电机内部动态与外部输入转矩的不确定性定义为一个总和扰动,从而将非线性不确定系统映射为未知线性系统,并构建了一个在总和扰动反相激励下的受控误差系统。据此设计了基于误差速度因子的自耦PI控制器模型,理论分析了自耦PI闭环控制系统的鲁棒稳定性和抗扰鲁棒性。仿真结果表明了该控制方法能稳定保持最大功率系数,在风力发电系统的最大功率跟踪领域具有良好的应用前景。

There are problems of nonlinearity,uncertainty parameters and torque disturbance in direct drive permanent magnet synchronous wind power generation systems.Thus a maximum power point tracking control method based on auto-coupling PI control theory is studied.Aiming at speed tracking,the uncertainty of internal dynamics and external input torque of a generator is defined as a total disturbance,and the nonlinear uncertain system is mapped to an unknown linear system,and a controlled error system under the inverse excitation of the total disturbance is constructed.Based on that,an auto-coupling PI controller model based on the error speed factor is designed,and the robust stability and anti-disturbance robustness of the autocoupled PI closed-loop control system are analyzed theoretically.Finally,the simulation results show that the proposed control method can maintain the maximum power factor in a stable fashion.This approach has a good prospect for application in the field of maximum power tracking of a wind power generation system.