双馈风电机组PWM整流器控制方法的研究

基于双馈风力发电机组在运行的过程中,随工况的变化,功率变换器应具有能量双向流动、交-直-交变换效率高、直流环节电压稳定等要求出发,以三相PWM电压型(VSR)整流器为基础,分析了PWM整流器的基本原理,并建立了在三相静止坐标系下的变换器数学模型,应用电压矢量定向控制技术,并采用电压电流双闭环控制模式以及SVPWM调制方法构建了功率变换器系统,通过Sim Power Systems和Simulink仿真实验,确认了所采用的控制方法可行,对直流环节电压有较好的稳定作用,可实现机网侧能量双向变换控制以及具有单位功率因数等特点。

RESERACH DOUBLY-FED WIND TURBINE PWM RECTIFIER CONTROL METHOD

Based on double-fed wind turbine during operation, with the change in working conditions, the power converter should base on some requirements, such as a two-way flow of energy ,AC-DC-AC conversion high efficiency ,the DC link voltage and so on . And the power conversion should also base on the three-phase PWM voltage type (VSR) rectifier ,analyzing the principles of PWM rectifier, establishing the inverter mathematical model in Three Static Coordinate system, applying the voltage vector oriented control technology and the method of modulation of SVPWM to build the power converter system. By doing the simulated experiments of Sim Power Systems and Simulink, we affirm that the control method is feasible enough and has many features, such as making DC link voltage stay in stability, making two-way conversion of energy in the motor control network side machine side come true, and possessing the unity factor.