双馈风机的电磁暂态平均化建模和快速仿真

摘要

为了精确、快速地模拟大量风电机组并网后的暂态响应,需要研究双馈风机的快速电磁暂态仿真模型和方法.在脉宽调制(pulse width modulation,PWM)变流器的分段平均化模型和改进电磁暂态仿真(electromagnetic transient simulation program,EMTP)算法的基础上,提出了双馈风机的电磁暂态平均化建模方法.利用平均化建模方法,将风机中的时变子系统转化为分段定常子系统,从而避免了频繁修正系统的导纳矩阵,并可采用较大的积分步长.测试结果表明,快速仿真模型和方法可以在保证仿真结果正确性的前提下,大幅提高仿真效率.%In order to simulate the transient response of large plenty of wind turbines integrated into the power system accurately and rapidly,fast electromagnetic transient simulation model and method for doubly-fed wind turbines (DFWTs) are necessary.Based on the averaged model of pulse-width modulation (PWM) converters and improved electromagnetic transient simulation program (EMTP) algorithm,this paper proposes an averaged model for DFWT.The averaged model is adopted to transfer time varying subsystems into piecewise time-constant subsystems of DFWT,with the purpose of avoiding changing conductance matrix frequently and adopting larger integration time steps.Case study demonstrates that the proposed model and method can enhance simulation efficiency effectively without compromising accuracy.