并网双馈风力机感应发电机效应研究

Induction generator effect analysis of doubly-fed wind generator connected to the power system

中国大型风电场的建立,使得大容量风功率需交流输电系统远距离输送。风力机通过含串联电容补偿的交流输电系统外送功率时,可能诱发感应发电机效应(Induction Generator Effect,IGE),威胁系统的安全稳定运行。建立了双馈风力发电系统模型,从理论角度分析了影响感应发电机效应的因素;采用复转矩系数法,计算了串补度、输电线路电阻及风速变化时,系统的电气阻尼,最后进行了时域仿真验证。研究结果表明,串补度的增大、风速的减小及输电线路电阻的减小可以增大系统的电气负阻尼。当系统等效电气负阻尼大于定子和输电系统等效正阻尼之和时,将导致输出功率发散振荡,即产生感应发电机效应。

The establishment of large-scale wind power bases makes large wind power capacity, long-distance transport inevitable. The wind power passing through a series capacitor compensated line may cause induction generator effect（IGE） issues. This paper establishes a doubly-fed wind power system model to analyze the factors that influence the induction generator effect. Complex torque coefficient method is used to calculate the electrical damping at different series compensation, transmission line resistance and wind speed. The results show that the increase of series compensation and the decrease of wind speed and transmission line resistance can increase electrical negative damping. When the electrical negative damping is greater than the stator and the equivalent resistance of the transmission system, it will lead to continued divergence line current oscillations, which produces the induction generator effect.