Feng Shuhai

Analysis and Experiment of Influencing Factors of Power Branch Parameters for Intelligent Dispatching

With the changes of meteorological environment and power operation, power branch parameter will produce fluctuation. In this paper, the influencing factors of branch parameters are introduced from temperature, ampacity, seasonal variation. Dynamic characteristic of resistance and operational characteristics of reactance is studied. Fully considering the trait of probability, the test case of impedance is designed based on the platform of experimental verification in CEPRI. The results shows that reactance is the fundamental factor in state estimation indicator.

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.