利用广域测量系统的振荡中心定位及其应用

Location and its application of oscillation center using wide area measurement system

针对电势幅值不等、全系统阻抗不均时振荡中心的定位问题,文中提出一种利用广域测量系统的振荡中心定位新方法。当系统故障时,采用Ucosφ判据判别系统是否发生失步振荡,失步后利用广域测量系统获取电网全局动态实时信息,根据电势向量、母线电压向量及其差向量之间的夹角确定振荡中心位置,根据系统电压分布几何关系计算振荡中心电压。结合同调机群与功率不平衡度,给出了大区域互联电网的解列控制流程。实际算例表明,本文方法能够跟踪振荡中心的迁移,准确定位振荡中心,为后续解列控制奠定基础。

A new method of locating the oscillation center using the wide area measurement system is proposed in this paper,which aims at the problem of oscillation center positioning of the system whose amplitude of the potential is not equal and the whole system impedance is not uniform. When the system failure occurs,the Ucosφ criterion is exploited to judge whether the system begins to oscillate. The wide-area measurement system is used to obtain the global real-time information of the power grid,and the location of oscillation center is determined according to the angle among the potential vector,the bus voltage vector and their difference vector. Then,the voltage of oscillation center is calculated using the geometry of the system voltage distribution. Combined with the system coherent generators and power imbalance,the business process of splitting control is elaborated. The actual example shows that the method can track the migration of the oscillation center and provide the accurate position of the oscillation center,which lays foundation for the splitting control.