基于暂态能量流的双馈风电机组强迫振荡源定位

暂态能量流法是一种新型的振荡源定位方法。首先,根据暂态能量流的计算公式,结合双馈风电机组的轴系模型、网侧变换器模型及双馈感应电机的三阶简化模型,推导适用于双馈风电机组的暂态能量流,并定义能流功率作为判断能量流向的指标。然后,对双馈风电机组加入强迫振荡源后的频率特性进行分析。最后,基于PSCAD/EMTDC电磁暂态仿真平台搭建包含强迫振荡源的单机无穷大系统和多台风电机组经串补并网系统进行时域仿真。利用采集的数据计算暂态能量流和能流功率,验证了暂态能量流法对双馈风电机组强迫振荡源定位的有效性。

Forced Oscillation Source Location of Doubly-fed Wind Turbine Based on Transient Energy Flow

Transient energy flow method is a new method for locating oscillation sources. Firstly, according to the calculation formula of transient energy flow, combined with the shafting model, the grid-side converter model of doubly-fed wind turbine and the third-order simplified model of doubly-fed induction motor, the transient energy flow for doubly-fed wind turbine is deduced and the energy flow power is defined as an index of the energy flow direction. Secondly, the frequency characteristics of the doubly-fed wind turbine are analyzed after the forced sources are added. Finally, based on the PSCAD/EMTDC electromagnetic transient simulation platform, a single-machine infinite system with forced oscillation sources and a grid connection system of several wind turbines via series compensated line are built for time-domain simulation. Transient energy flow and energy flow power are calculated using the collected data. The validity of the transient energy flow method for locating the forced oscillation sources of doubly-fed wind turbines is verified.