变速恒频风电系统双PWM解耦控制仿真研究

The Simulation Research of Variable Speed Wind Turbine Double-PWM Inverter Decoupling Control

讨论了随机性风速下,非线性变速恒频双馈风力发电系统最大风能捕获控制问题。分析了满足双馈电机能量双向流动的双脉宽调制(PWM)变换器及其数学模型,此处采用双PWM变频器解耦控制策略,转子侧变频器采用定子磁链定向的双闭环控制策略,电流环实现定子无功功率的调节,转速环实现最大风能捕获;网侧变频器采用电网电压定向控制策略,保持直流母线电压稳定。基于Matlab/Simulink软件平台,构建了15 kW风力发电系统完整的仿真模型。利用该模型对风电系统的最大风能追踪控制进行了详细的仿真研究,验证了理论及仿真分析的正确性。

A maximum wind capture control system of the nonlinear variable-speed constant-frequency doubly-fed wind power generation is discussed under the stochastic wind speed.To meet the two-way flow energy of double-fed generation,a pulse width modulation （PWM） inverter and its mathematical model are analyzed.Decoupling control strategy is used while rotor side inverter using stator flux oriented control of dual-loop.The current loo17 is to achieve regulation of the stator reactive power and the speed loop is to realize for maximum wind capturer.Network side of the inverter uses the grid voltage oriented control strategy to maintain DC voltage.A completed system of 15 kW wind turbine simulation model is built based on Matlab/Simulink software simulation platform.The Simulation results verifies the correctness of theoretical.