风力发电机无速度传感器网侧功率直接控制

Direct-control Grid-connected Power with None Direct Speed Measurement of Direct-drive Wind Generator

采用不可控整流和可控逆变的交直交结构作为直驱式永磁同步风力发电机的并网电路。从发电机转速、功率和直流母线电压之间的相互关系出发,提出利用直流母线电压进行转速观测实现无速度传感器。根据风力机特性和并网电路的功率模型,提出网侧功率直接控制实现最大风能跟踪。实现了有功／无功功率的解耦控制,并给出有功／无功的参考值选取范围。最后采用电流滞环方法进行逆变器控制。仿真结果验证了所提出的控制策略简单有效、具有良好的稳态精度和动态性能。

The AC DC AC structure of non-controllable rectifier and controllable inverter is used for grid-connected circuit of the direct-drive permanent-magnet synchronous wind generator. According to the relationship of rotational speed, power and DC bus voltage, observing rotational speed by using DC bus voltage is proposed to realize none direct speed measurement. The wind turbine characteristic and grid connected power model are analyzed, and the direct-control grid connected power to realize tracking maximal wind energy is proposed without controlling generator. The decoupling control of active and reactive power is realized and the numerical range of active and reactive power is given. The current hysteresis-band control is used to control inverter. Simulation results demonstrate the good static and dynamic performance of the proposed control strategy.