基于TMS320F28335的风机并网变流器低电压穿越实现方法

摘要

以电压型PWM并网变流器数学模型和前馈解耦控制为基础,论述了并网变流器在LVRT期间的控制方法和逻辑过程.以TMS320F28335为核心,结合风电机组并网运行特点,进行了大功率并网变流器系统设计.最后在电网跌落模拟装置上进行了LVRT期间的动态无功补偿实验.实验结果表明,硬件系统低电压穿越期间运行可靠,无功电流控制静态和动态性能良好.%Based on the mathematical model and feed-forward decoupled control for voltage source PWM grid-connected converter,the control method and logical process of low voltage ride-through (LVRT) are discussed first.In addition,a high-power grid-connected converter is designed by using TMS320F28335 with the feature of the wind turbine parallel operation.Finally,dynamic reactive power compensation experiment of LVRT is carried out on voltage sag generator.The experimental results show that the converter works well and has excellent dynamic,steady-state performance of reactive current control.