风电并网引起潮流分布对电力系统小干扰功角稳定性的影响研究

Research on the influence of power distribution variation caused by wind power integration on power system small signal power angle stability

为研究风电并网的稳定性问题,该文从风电并网改变系统潮流分布的角度出发,研究风电并网对系统小干扰功角稳定性的影响。首先,通过线性化建模,推导计算同步机与系统其余部分间动态交互的方法。然后,研究风电并网前后,以及风电输出功率改变的影响,指出风电输出功率将改变系统平衡机出力,如果平衡机状态变量在机电振荡模式中参与性较高,则机电振荡模式受影响程度较大,内在原因是平衡机动态交互发生较大的改变。随后,研究风电场接入地点的影响,得出结论:风电场接入地点与平衡机间的距离由近及远时,机电振荡模式受平衡机动态交互变化的影响程度将逐渐减弱。最后演示和验证上述分析,为风电场位置规划选取提供理论指导。

In order to study the stability of wind power integration,this paper studies the influence of wind power integration on the power angle stability of small signal from the point of view that wind farm integration changes the power flow distribution of the system.Firstly,the dynamic interaction between the synchronous machine and the rest of the system is derived by linearization modeling.Then,the influence of wind farm before and after grid connection and the change of wind power output power is studied.It is pointed out that the output power of wind power will change the output of the system balancer.If the state variables of the balancing machine are highly involved in the electromechanical oscillation mode,the electromechanical oscillation mode is greatly affected.The internal reason is that the dynamic interaction of the balancing machine changes greatly.Then,the influence of wind farm access site is studied.It is concluded that when the distance between wind farm access point and balancer is different from near to far,the influence of dynamic interaction of balancing machine on electromechanical oscillation mode will gradually weaken.Finally,the system is taken as an example to demonstrate and verify the above analysis,providing theoretical guidance for the selection of wind farm location planning.