采用正规形方法确定重要负荷节点排序

Determination of Load Buses Rank by Normal Forms Method

电网结构是电力系统安全稳定运行的一个重要因素。为研究不同负荷节点对电压稳定性所具有的不同影响程度,首先应用向量场正规形理论分析电力系统潮流方程,提出了以节点电压非线性参与因子作为依据衡量负荷节点影响电压稳定性的程度的方法。该方法可计及电力系统非线性特性对电压稳定性的影响,因此与线性化分析方法相比,该方法在系统具有强非线性特性的条件下,仍能准确识别负荷节点的重要程度。然后用该方法研究了New England 39节点系统中不同负荷节点对电压稳定性的影响,通过对系统电压稳定性指标的比较,验证了所提出方法的有效性。

The structure of network is an important factor when power systems operation or design is considered. Load buses play different roles in power system voltage stability. In order to determine the influence of different load buses on voltage stability, the power system power flow equations are analyzed by using the theory of normal forms of vector fields. A method is proposed by making use of nonlinear participation factors. Then the effect of power system nonlinearity on voltage stability of the system can be considered. In order to show the effectiveness of the proposed method, New England 39-bus test power system is used as an example. The case study shows that the proposed method can obtain more accurate and reliable result. Comparing with the linearization method, the impact of load buses can be determined even in condition that system is characterized with strong nonlinearity.