基于PSCAD/EMTDC的直驱式风力发电接入系统建模与仿真

针对频率可变的多极直驱式同步风力发电机接入系统,该文在考虑风力机大转动惯量的情况下,采用电网电压矢量定向和双闭环控制技术,实现了基于背靠背VSC换流器的有功无功独立控制。研究了不依赖于风速测量的直驱式机组最大功率追踪策略,桨距角控制器设计以及变风速下风电机组对电网的无功支持问题。最后通过PSCAD/EMTDC搭建了该接入系统模型,阶跃和随机风速下的仿真结果验证了该模型的合理性及控制策略的有效性。

MODELING AND SIMULATION ON CONNECTION OF DIRECT-DRIVE WIND TURBINE BASED ON PSCAD/EMTDC

Concerning the large, inertia of wind turbine, double closed loop control structure and stator voltage-oriented reference frame were adopted for the variable frequency connection system of direct-drive wind turbine with wound rotor synchronous generator (D-WRSG), and decoupling control of active and reactive power was realized by a back-to-back voltage-source converter system. Pitch control, reactive power support under variable wind speed and maximum power point tracking (MPPT) method without the measurement of wind speed were investigated. The model of D-WRSG and the proposed control strategiy were realized with PSCAD/EMTDC. Simulation results under step change and random wind speed verified the model and the control strategy.