A novel application architecture of smart gird dispatching and control systems is proposed based on decompose-coordinate strategy and multi-index optimization approaching control. By decompose-coordinate strategy

the higher level control center can carry out system level calculation such as load flow

short circuit current analysis

small-signal disturbance analysis

electromechanical transient simulation

electromechanical and electromagnetic hybrid simulation etc

even if the higher level control center does not collect real-time data and model data of lower level control centers. Therefore

decompose-coordinate strategy can reduce performance requirements for hardware and calculation software

and improve the convergence of system level calculation and fineness of power system models. By multi-objective optimization

smart grid dispatching and control systems can be more intelligent and have better balanced security

efficiency and environment protection. Also

in order to provide on-line power systems model for on-line applications

a state estimating method with load flow equation constraints is proposed. To provide stability margin index for on-line applications

a dynamic security analyzing method capable of giving minimal/maximal stability margins is proposed.