中文摘要：

给出通过对运行点实施微扰以获得割集电压稳定域（CVSR）局部边界的新方法。首先利用潮流追踪，确定对割集每条支路潮流影响最大的发电机一负荷节点对，通过对其实施控制以实现对每条支路潮流增、减双向的精确微扰；然后利用微扰后的运行点，确定系统的电压稳定临界点，进一步得到CVSR边界在增、减两扰动方向上的局部近似边界；最后，通过平移和加权处理，得到CVSR局部边界的精确结果。多个系统的验证结果表明，该方法可有效降低CVSR边界的拟合误差。

英文摘要：

A new approach to determine the local boundary of voltage stability region in a cut-set power space （CVSR） is presented. Power flow tracing is first used to determine the generator-load pair most sensitive to each branch in the interface. The generator-load pairs are then used to realize accurate small disturbances by controlling the branch power flow in increasing and decreasing directions to obtain new equilibrium points around the initial equilibrium point. And, continuous power flow is used starting from such new points to get the corresponding critical points around the initial critical point on the CVSR boundary. Then a hyperplane cross the initial critical point can be calculated by solving a set of linear algebraic equations. Finally, the presented method is validated by some systems, including New England 39-bus system, IEEE 118-bus system, and EPRI-1000 bus system. It can be revealed that the method is computationally more efficient and has less approximation error. It provides a useful approach for power system online voltage stability monitoring and assessment.