Niu Linlin

Study on huge power grid online operation trend assessment system

Online dynamic security analysis conclusion is lagging power grid operation mode changes, and contradictions with the timeliness of power grid real-time scheduling and operation control have become increasingly prominent. To solve the problem, framework of power grid online operation trend analysis system is constructed, and three advanced technologies are researched, including future power flow algorithm based on controlling power of multi transmission section simultaneously, operation trend analysis method based on stability assessment index and multiple fault coordination control method. Huge power grid online operation trend analysis system is developed, and timeliness problem of the online security analysis is solved. The system has realized the change from the accident alarm, emergency control to accident early warning, prevention and control. It can predict future operation state of power system, and pre-control operation risk of power system.

Research on active power control analysis method of transmission interfaces for online TTC calculation

Total Transfer Capability(TTC) play an important role on anlysis and control of power system stability. This paper proposes an method about active power control strategy analysis of transmission interfaces, which identifies the most sensitive generator for transmission interfaces and decides control strategy of transmission interfaces active power automatically. It can improve accuracy of online TTC which dependent on off-line simulation knowledge, also could not automatically adapt the real-time operation mode of power system. In this paper, a varible of integrative sensitivity of transmission interfaces is defined for reflecting the control effect of different generator for total power of transmission interface. Based on this varible, the method can calculate the adjustment margin and priority of generator in power network, and search adjustable electric equipments for controlling transmission interfaces power, and provide control strategy for transmission interfaces active power. Finally the simulation analysis of actual exapmle verifies the effectiveness of the method.