The fluctuation of the wind power will be balanced through the control of the charging and discharging power of the energy storage unit connected with the VSC-HVDC system in parallel to make the injected wind power into the power system stable.

<abstract>e device of Flexible AC Transmission System will bring a lot of affections to relaying protection especially distance protection, such as Unified Power Flow Controller - UPFC, Thyristor Controlled Phase Shifting Transformer - TCPST, Thyristor Controlled Series Com pensator - TCSC and energy storage elements.

On the basis of analyzing the factors which affect the urban passenger transport,the paper uses logistics unit grid theory to establish a forecast model that determines the least and necessary carriers.