In view of the problem of frequent sub-synchronous oscillations in the new energy gathering area

it is proposed in this paper to increasing the monitoring points of thermal power unit shafting torsion al vibration on the power plant side on the basis of installation of sub-synchronous oscillation monitoring points on the power grid side

improve the cooperative monitoring strategy of monitoring accuracy of sub-synchronous oscillations in the regional power grid so to achieve such functions as on line monitoring

record

damping calculation and stability assessment of sub-synchronous current mode of power grid tie line and sub-synchronous mode of power plant.It is shown by the site test that the strategy can perform one line monitoring of sub-synchronous oscillation

achieve on line identification and pre-warning of the mode damping

verify effectiveness of the strategy and provide a feasible research direction for the design of the integrated closed-loop defense system of sub-synchronous oscillation monitoring

early warning and protection.