基于支路潮流可行解域的在线实时电压稳定性分析

提出一种用于实时在线电压稳定分析的综合评估方法。文中以电力网络中的单条支路为研究对象，给出支路潮流平衡点存在条件，分析支路有功功率和无功功率流向的异同对其自身潮流平衡能力的影响程度。通过分别列写线路有功功率、无功功率与其两端电压之间的关系方程式，建立支路潮流方程平衡点的可行域，并分析其边界条件，给出评估网络内各支路及整个系统的在线电压稳定性指标。算例分析表明，所建立的指标能全面客观地描述支路输送特定功率时潮流平衡能力的维持状况及对于临界运行条件的接近程度。指标定义物理概念清晰，计算量小，适合于电压稳定性在线监控的需求。

On-line Real-time Voltage Stability Analysis Based on Feasible Equilibrium Solution Region of Branch Power Flow

A compositive on-line real-time voltage stability assessment method based on equilibrium solution region of branch power flow was proposed. With the branch as research object, the conditions of equilibrium solution were presented. The similarities and differences between the flow direction of active power and reactive power were analyzed to determine incidence of them to equilibrium solution. The equations of active power and reactive power via node voltage of the branch were listed to form the equilibrium solution region with the region boundary conditions. Online voltage stability indices of every branch and the entire system were established. The examples show that the indices can effectively evaluate the capability of maintaining the equilibrium solution and the approaching status to critical operation conditions. The index has the advantage of concise meanings and low computation burden, and can offer an effective analysis tool for real time on-line assessment of voltage stability in power systems.