双馈风力发电机斜率控制特性分析

Characteristic Analysis of Droop Control of Double Fed Induction of Wind Power

针对并网运行双馈风力发电机斜率控制系统结构及控制特性进行了分析,考察了控制系统对周边电网的影响,并进行电压骤降下的机电暂态特性动态仿真分析,结果表明:双馈风力发电机在电压骤降下能够维持稳定的功率输出,有功功率输出减小,无功功率输出增加,但在反馈风机在运行所允许的范围内变化;同时在定转子功率交换过程中直流电压能够保持恒定值,系统稳定运行;此外,在电压骤降消失后,风机能够调节有功功率和无功功率输出,在机组允许的功率输出范围内恢复初始运行状态;最后,双馈风机的斜率控制器应该合理进行选取,斜率过大将造成系统的低频振荡。

This paper carries on the analysis of structtrrc and characteristic in droop control of double fed induction of wind power, exam the effects of control system on grid nearby, gives a simulation on the electric-machine transient characteristic during voltage dip. The result shows that double fed induction can keep the output power stably with decreasing active power and increasing the reactive power; could keep the DC voltage at constant value; could restore the initial state after the voltage dip disappeared; and with select the droop parameter comectly the system low frequency oscillate could be restricted.