The concept of power system high-performance computing mode is illustrated. Following the evolution direction of off-line computation to on-line cooperation

the high-performance computing modes of parallel computation

distributed computation and cloud computation are mainly analyzed to improve the calculation speed and reliability

and provide the computing service. From the aspects of decomposition coordination methods

numerical parallel computing

hard-computing architecture and soft-computing mode

the overview of state estimation

power flow calculation

and online dynamic security analysis(DSA)including the transient stability computation and static safety analysis function are summarized. Three evolution phases to realize on-line computing cooperation roadmap are described

and the key technologies including assignment-mapping mechanism

decomposition-coordination computing service

module service interface and data interaction format are discussed in detail to support the on-line cooperation computation mentioned above. In the end

the on-line cooperation analysis computing scenario and state estimation service mode are designed in the cloud computing environment

which provides a reference for the cloud computing based design and development of dispatching control system.