基于虚拟上下限曲线的电压暂降防治指标

基于敏感设备对电压暂降响应的不确定性，提出了一种针对单一耐受特性的虚拟上下限曲线的电压暂降防治指标。首先根据设备耐受特性的不确定性刻画虚拟上下限曲线，在此基础上建立了基于虚拟上下限曲线的电压暂降严重程度评估模型，直观地呈现对设备的影响情况；然后通过考虑用户治理期望设定阈值建立了补偿成本函数和基于经济效益的收益函数，并定义了电压暂降防治指标。最后实例分析验证了所提方法的有效性与合理性，可用于实际系统的电压暂降评估与治理工作。

A Voltage Sag Prevention Index Based on Virtual Upper and Lower Limit Tolerance Curve

Based on the uncertainty of equipment sensitivity to voltage sags, a voltage sag prevention index is proposed for the virtual upper and lower limit curve with single tolerance characteristic. Firstly, the virtual upper and lower limit curves are described according to the uncertainty of the equipment’s tolerance characteristics, and on this basis, a voltage sag severity evaluation model is established based on the virtual upper and lower limit curves to visually present the sag’s impact on the equipment. And then, with consideration of user mitigation expectation threshold, a compensation cost function and an economic benefit based profit function are established, and the voltage sag prevention index is defined. Finally, the effectiveness and rationality of the proposed method is verified through a case study. The proposed method can be used for voltage sag evaluation and governance of actual power systems.