PSS/E中风电机组的低电压穿越模拟方法

Simulation method of low voltage ride-through of wind generators in PSS/E

为了更加精确地研究接入电网的大型风电场与主网之间的相互影响,在PSS/E风电机组模型中低电压穿越的模拟已经成为不可或缺的环节。由于PSS/E中风电机组模型不包含低电压穿越模块,需要通过用户自定义的方法实现:用户输入风电机组机端电压启动值作为低电压穿越模块的启动标识,并输入其他几个低电压穿越曲线的形状定义参数,然后通过记录仿真时间决定风电机组是否在超出低电压穿越曲线时被切除。进而具体介绍了PSS/E中双馈变速感应风电机组和笼型定速感应风电机组的模型,并以此为基础进行实际算例仿真,通过在典型临界电压点施加不同持续时间的故障,验证了PSS/E中风电机组低电压穿越模拟方法的有效性,具有一定的工程意义。

In order to accurately study the mutual influence between a wind farm and a grid, in PSS/E the Low Voltage Ride-Through （LVRT） simulation has become indispensable. Because the wind generator models in PSS/E do not include the LVRT module, the user defined model is needed. And the realization method is explained. Namely, users need to input the threshold value for terminal voltage of wind generators as a signal for operation of LVRT module, and the other parameters defining the shape of LVRT curve. Then by recording the simulation time, the cut-out moment of wind generators can be determined if terminal voltage curve is outside the LVRT curve. Then the detailed models of Fixed Speed Induction Generator （FSIG） and Doubly Fed Induction Generator （DFIG） are presented. Based on the analysis of different fault duration time on typical terminal voltages of the above two types of wind generators, the effectiveness of the user defined LVRT module is verified, which is of great significance in engineering.