Emergency Frequency Control Strategy for Double-high Sending-end Grids With Coordination of Multiple Resources
A frequency emergency control strategy with multiple resource coordination is proposed in response to the scarcity of frequency regulation resources and weakened emergency control capability after a high capacity DC blocking in high shares of renewables and power electronics(double-high)sending-end systems.Firstly,the frequency response of sending-end after DC blocking is analyzed,integrating event and response-driven resources response characteristics such as synchronous generators,renewables,pumped storage,energy storage,DC modulation,security and stability control for generator tripping(SSGT)to construct the frequency emergency control framework and multiple resources coordination for system frequency response(MRCSFR)model.Then,to minimize the emergency control cost after DC blocking,considering the constraints of multiple resources,power balance,and transient frequency safety,an emergency frequency control model with coordinating multiple resources is established.Finally,case studies are conducted using an improved IEEE RTS-79 system.The simulation results show that the emergency control strategy solved by the proposed model can coordinate various resources while meeting transient frequency safety requirements and effectively avoiding renewable tripping after DC blocking.
frequency stability"double-high"power systemsending-end gridemergency frequency controlrenewable energy tripping
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