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Automatic Generation Control (AGC) is one of the important techniques in modern power system operation and control. It takes important tasks, such as, power system frequency regulation, tie-line power control between inter-connected power systems, and etc. Research results of the lOOOkV AC UHV tie-line power control strategies in North China power Grid were introduced. Test results in real power system show the feasibility and validity of the strategies. The strategies have provided technical supports for stable operation of the UHV tie-line.

Abstract-With the construction of UHV power grid, power grid operation gradually presents the integration characteristic. Hence, it is much more difficult for the current intelligent power grid dispatching and control system's bus to meet the needs of data exchange among the different dispatching agencies. According to the characteristics of the smart grid, a cloud bus architecture is proposed in this paper, while the power dispatching domain name, distributed proxy, cloud service management and access, cloud message management and transmission are studied in order to achieve sharing of services and efficient transmission of data and expound the prospect of cloud bus finally.Keywords-cloud bus; distributed proxy; cloud service management and access; cloud message management and transmission