双馈风力发电系统功率解耦控制策略仿真研究

Simulation on Power Decoupling Control of Doubly-Fed Wind Power Generation System

研究风力发电机功率效率优化控制问题,由于外部风力环境变化较大,应保证变换器的稳定性控制。传统的控制方法不但动态和稳态性能差,而且控制策略比较复杂。为了改善控制效果,提高直流电压利用率,采用了SVPWM调制技术,并提出了一种功率解耦控制策略的双脉宽调制(PWM)变换器控制方案。网侧变换器控制直流母线电压的稳定并调节网侧功率因数,转子侧变换器进行矢量解耦控制,调节定子有功和无功功率。仿真结果表明,控制策略能够快速跟踪风速变化,维持直流侧母线电压恒定,输出的电流为正弦波,并且与电网电压同频同相,满足并网条件,实现有功和无功功率的独立调节,对并网风力发电系统的设计研究提供有意义的参考。

Because doubly - fed wind power generation system is a muhivariable system with high orders, nonlinear and strong coupling, the dynamic and static performance of traditional control methods are poor, and also tje control strategy is more complex. In order to improve the control effect and DC voltage utilization, there adopted SVPWM modulation technology, and a control scheme based on power deeoupling control strategy was proposed. The grid - side PWM converter adjusted power factor by keeping the stabilization of DC bus voltage, while rotor - side PWM converter adjusted the active and reactive power by vector control. The simulation shows that the control strategy can fastly track speed changes, maintain a constant value of DC side, and output sinusoidal current which has simlar phase and frequency as voltage, so that it satisfies grid - connected conditions and realizes active power and reactive power independent regulation, which can be considered as a reference on the simulation and operation analysis of ac- tual grid -connected wind power generation system.