The Key Technology of Multi-frequency Oscillation Cooperative Monitoring and Advanced Warning

The new problem of multi-frequency oscillation and disturbance in new power system seriously threatens the safe operation of power grid. The existing multi-frequency phasor measurement technology can realize oscillation monitoring within 300Hz, centralized storage and monitoring at the master station, and off-line modeling and simulation method is used to evaluate the network risk. The large amount of multi-frequency phasor measurement data in the master station centralized storage and monitoring occupy a lot of resources, off-line risk assessment can not adapt to the real-time change of the power grid conditions. Based on the concept of edge computing, a multi-frequency oscillation collaborative online monitoring and advanced warning scheme is proposed to realize multi-level monitoring and advanced warning for bay-station-regional power grids. Key technologies such as grid bay monitoring, station area monitoring and advanced warning, master-substation coordination and wide-area coordination monitoring and advanced warning are expounded. The correctness and effectiveness of multi-frequency oscillation collaborative monitoring and advanced warning are verified by experiments. It can meet the requirement of re-al-time monitoring and risk advanced warning of multi-frequency oscillation in power grid.