永磁直驱风电系统建模及其机电暂态模型参数辨识

Modeling for direct-driven wind-power system with PMSG and parameter estimation for its electromechanical transient mathematical model

针对基于双脉宽调制(PWM)变换器的永磁直驱风电系统的运行特性,分析了风力机特性、电机侧变换器和电网侧变换器的控制策略,利用Matlab/Simulink建立了反映电力电子开关动作的永磁直驱风电系统详细模型,并在此基础上根据同步电机3阶暂态模型,建立了直驱风机的机电暂态数学模型,采用粒子群算法(PSO)对模型进行了参数辨识。仿真结果表明,该详细模型能够描述永磁直驱风电系统对不同风速的响应,实现风能的最大功率跟踪;机电暂态数学模型与详细模型特性接近,能够从总体上反映永磁直驱风电系统对端电压变化的有功、无功响应,PSO参数辨识有效。研究结果表明,所建立的详细模型能够用于控制方式的研究以改善输出特性,机电暂态模型能够用于研究电网与永磁直驱风电系统的相互影响。

Aiming at the characters of direct-driven wind-power system with permanent magnet synchronous generator（PMSG） based on back-to-back pulse width modulation（PWM） converter,the wind turbine,the control strategies of turbine-side converter and grid-side converter were analyzed.PMSG detail model using Matlab/Simulink was established.Based on this,electromechanical transient model for direct-driven wind-turbine generator was constructed according to 3 orders synchronous generator model.Particle swarm optimization（PSO） algorithm was used to identify the parameter for the mathematical model.The simulation results show that the detail model can reflect direct-driven wind-power system’s operation as wind speed changing,while it can track the maximum power point.The electromechanical transient model coincides with the detail model well.It reflects the active and reactive power of the direct-driven wind-power system when grid voltage is changed.The parameter identification using PSO is effective.The results indicate that the detail model can be used to refine power output control strategy,the electromechanical transient model can be used to study direct-driven wind-power system interacted with the grid.