基于无风速传感器的永磁直驱风力发电系统的直接转矩最大功率跟踪控制

Maximum Power Point Tracking of PMSG Wind Turbine System Based on The Direct Torque Control without Wind Speed Sensors

风力发电系统最大风能跟踪控制中使用风速传感器来检测风速,不仅增加了设备及其维护成本,也减少了对风机系统整体的利用率。论文提出了一种永磁直驱型风力发电系统的无风速传感器直接转矩控制策略,通过直接控制电机的转矩和定子磁链幅值实现永磁同步发电机的最大功率跟踪。相比于传统的矢量控制,省去了复杂的坐标变换、繁琐计算等问题,直接根据发电机转速来估算最优转矩给定,不需要转速外环,避免了风速的测量和风速测量不准确等问题,具有快速的转矩和转速响应性能,能快速地实现最大功率跟踪,有效地提高风机系统整体的利用率。最后,建立了dq轴坐标系下的永磁同步发电机数学模型,通过Matlab/Simulink仿真证明所提出的控制策略的正确性和有效性。

For the problem of the wind speed sensors must be used in wind power system to detect wind speed in the maximum wind power tracking control and not only increase the cost of the equipment and its maintenance also reduces the utilization of the fan system as a whole. This paper investigates the novel wind speed sensorless with direct torque control(DTC) for wind energy conversion system(WECS) based on the permanent magnet synchronous generator(PMSG). Through the direct control of the torque and stator flux linkage amplitude of the permanent magnet synchronous generator to maximize the generated power from wind turbine. The system includes a wind turbine, a PMSG, two converters and an intermediate DC link capacitor. Compared with vector control, the direct torque control does not need complex coordinate transformation and the complicated calculation Using the generator speed to estimate the optimal given torque directly. avoiding the problem of wind speed measurement is not accurate and improve the utilization rate of the fan system as a whole effectively and the torque, speed response faster.Lastbuilding the mathematical model of permanent magnet synchronous generator under dq axis coordinates. Through modeling simulation verify the correctness and effectiveness of the proposed control strategy.