A method of determining emergency reserve in a system with multiple HVDCs feed-in

Emergency reserve (ER) is set to deal with the power imbalance events, such as forced outage of units or HVDCs, to guarantee the reliability of a power system. The reserve capacity would affect both the reliability and economy of a power system that should be set coordinately. In this paper, the mechanism of ER and the main factors affecting the ER capacity requirement in a regional power grid with multiple HVDCs are analyzed. The process to calculate the minimal value of the emergency reserve capacity is designed based on the reliability indexes of LOLP10 and EPNS10. And from the viewpoint of economy the calculation method of the maximum capacity of ER is proposed, all of the generation cost, the reserve cost, and the load loss cost are taken into account. Finally, effectiveness of the method proposed in this paper is demonstrated by examples based on the data of a regional power grid with 7 HVDCs feed-in.