基于SVC的大规模双馈风电场次同步振荡研究

为了探究动态无功补偿装置与大规模双馈风电场次同步振荡之间的关系,文中在MATLAB/Simlink软件搭建了含SVC的双馈风机经无串补线路并网系统模型,结合时域仿真法研究了SVC的拓扑结构、投入时间、控制器参数和系统扰动对系统运行特性的影响。结果表明:不同的SVC拓扑结构投入系统后,均会引发系统发生次同步振荡,且与投入系统的时间无关。当次同步振荡出现的情况下,给系统施加一个小扰动,控制器参数K_p过大产生超调,激增了次同步振荡。由于电压的超调发生振荡,进而导致各个SVC无功量的不规律运动,AVR中比例系数K_p的超调是产生次同步振荡的源。

Analysis of Subsynchronous Oscillation of Large Scale Doubly Fed Farm Based on SVC

In order to explore the relationship between dynamic reactive power compensation device with large DFIG wind farm subsynchronous oscillation, in this paper, MATLAB/Simlink software to build a doubly fed wind machine with SVC the series compensated transmission line model of the network system, studied the topology structure of SVC based on the time domain simulation method, input time, impact on the operating characteristics of the system disturbance the controller parameters and the system. The results show that SVC different topology of the system, will cause the system to subsynchronous oscillation, and has nothing to do with the input system of time. When the subsynchronous oscillation occurred in the case, apply a small perturbation to the system, leading to excessive production Kp overshoot causes a surge of subsynchronous oscillation, due to the overshoot of the voltage oscillation, which leads to irregular motion of the SVC reactive power. The overshoot of the scale factor AVR in Kp is the source of subsynchronous oscillation.