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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。
Adopting the AC-DC cross-connect structure with uncontrollable rectification and controllable inverter as the grid-connected circuit of the direct-drive permanent magnet synchronous wind power generator. Based on the relationship between generator speed, power and DC bus voltage, a speed sensor based on DC bus voltage is proposed to realize speed sensor. According to the characteristics of wind turbine and the power model of grid-connected circuit, the direct control of grid-side power is proposed to realize the maximum wind-energy tracking. The decoupling control of active / reactive power is realized, and the reference range of active / reactive power is given. Finally, the current hysteresis loop method for inverter control. Simulation results show that the proposed control strategy is simple and effective, with good steady-state accuracy and dynamic performance.