With the large-scale grid-connection of new energy sources, many stability problems arise to make distributed synchronous condensers as dynamic reactive power compensation devices to be applied on a large scale. Existing studies have not fully revealed the correlation mechanism between the dynamic characteristics of the synchronous condenser torque and the power angle oscillation characteristics after disturbance. For this reason, this paper aims at the scenario that the distributed condenser is independently configured in the system feeder, and based on the Heffron-Phillips model considering the system resistance, it reveals the law of the influence of various types of factors on the additional torque, and simulates the conclusions of the analyses by constructing a typical electric power system model, which provides a reliable theoretical basis for the engineering practice.